cGAS/STING axis mediates a topoisomerase II inhibitor–induced tumor immunogenicity
Checkpoint blockade antibodies have been approved as immunotherapy for multiple types of cancer, but the response rate and efficacy are still limited. There are few immunogenic cell death–inducing (ICD-inducing) drugs available that can kill cancer cells, enhance tumor immunogenicity, increase in vivo immune infiltration, and thereby boost a tumor response to immunotherapy. So far, the ICD markers have been identified as the few immunostimulating characteristics of dead cells, but whether the presence of such ICD markers on tumor cells translates into enhanced antitumor immunity in vivo is still being investigated. T...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Zining Wang, Jiemin Chen, Jie Hu, Hongxia Zhang, Feifei Xu, Wenzhuo He, Xiaojuan Wang, Mengyun Li, Wenhua Lu, Gucheng Zeng, Penghui Zhou, Peng Huang, Siyu Chen, Wende Li, Liang-ping Xia, Xiaojun Xia Source Type: research
Proximal tubule ATR regulates DNA repair to prevent maladaptive renal injury responses
In conclusion, PT ATR activation is a key component of the DDR, which confers a protective effect mitigating the maladaptive repair and consequent fibrosis that follow kidney injury. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Seiji Kishi, Craig R. Brooks, Kensei Taguchi, Takaharu Ichimura, Yutaro Mori, Akinwande Akinfolarin, Navin Gupta, Pierre Galichon, Bertha C. Elias, Tomohisa Suzuki, Qian Wang, Leslie Gewin, Ryuji Morizane, Joseph V. Bonventre Source Type: research
Glycan-dependent HIV-specific neutralizing antibodies bind to cells of uninfected individuals
A number of highly potent and broadly neutralizing antibodies (bNAbs) against the human immunodeficiency virus (HIV) have recently been shown to prevent transmission of the virus, suppress viral replication, and delay plasma viral rebound following discontinuation of antiretroviral therapy in animal models and infected humans. However, the degree and extent to which such bNAbs interact with primary lymphocytes have not been fully delineated. Here, we show that certain glycan-dependent bNAbs, such as PGT121 and PGT151, bind to B, activated T, and natural killer (NK) cells of HIV-infected and -uninfected individuals. Binding...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Jana Blazkova, Eric W. Refsland, Katherine E. Clarridge, Victoria Shi, J. Shawn Justement, Erin D. Huiting, Kathleen R. Gittens, Xuejun Chen, Stephen D. Schmidt, Cuiping Liu, Nicole Doria-Rose, John R. Mascola, Alonso Heredia, Susan Moir, Tae-Wook Chun Source Type: research
DNA damage response protects against progressive kidney disease
The pathophysiology of cellular injury and repair has been extensively studied in acute kidney injury (AKI) for more than 70 years. Although a great deal of knowledge has been generated, a debate over the importance of repairing damaged cells versus replacing them by proliferation remains. In this issue of the JCI, Kishi et al. demonstrate that following kidney epithelial cell injury, DNA repair, rather than cell proliferation, plays the central role in recovery and longevity by minimizing apoptosis, G2/M cell-cycle arrest, and subsequent fibrosis. This has important therapeutic implications and highlights the need for mor...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Bruce A. Molitoris Source Type: research
Striking a balance in an antibody network: A roadmap for HIV-1 vaccines
This study highlights the intricate interactions between antibodies and innate immune functions in humans. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Tysheena P. Charles, Cynthia A. Derdeyn Source Type: research
Antibody Fc effector functions and IgG3 associate with decreased HIV-1 risk
HVTN 505 is a preventative vaccine efficacy trial testing DNA followed by recombinant adenovirus serotype 5 (rAd5) in circumcised, Ad5-seronegative men and transgendered persons who have sex with men in the United States. Identified immune correlates of lower HIV-1 risk and a virus sieve analysis revealed that, despite lacking overall efficacy, vaccine-elicited responses exerted pressure on infecting HIV-1 viruses. To interrogate the mechanism of the antibody correlate of HIV-1 risk, we examined antigen-specific antibody recruitment of Fcγ receptors (FcγRs), antibody-dependent cellular phagocytosis (ADCP), and ...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Scott D. Neidich, Youyi Fong, Shuying S. Li, Daniel E. Geraghty, Brian D. Williamson, William Chad Young, Derrick Goodman, Kelly E. Seaton, Xiaoying Shen, Sheetal Sawant, Lu Zhang, Allan C. deCamp, Bryan S. Blette, Mengshu Shao, Nicole L. Yates, Frederick Source Type: research
AAV8-vectored suprachoroidal gene transfer produces widespread ocular transgene expression
There has been great progress in ocular gene therapy, but delivery of viral vectors to the retinal pigmented epithelium (RPE) and retina can be challenging. Subretinal injection, the preferred route of delivery for most applications, requires a surgical procedure that has risks. Herein we report a novel gene therapy delivery approach, suprachoroidal injection of AAV8 vectors, which is less invasive and could be done in an outpatient setting. Two weeks after suprachoroidal injection of AAV8.GFP in rats, GFP fluorescence covered 18.9% of RPE flat mounts and extended entirely around sagittal and transverse sections in RPE and...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Kun Ding, Jikui Shen, Zibran Hafiz, Sean F. Hackett, Raquel Lima e Silva, Mahmood Khan, Valeria E. Lorenc, Daiqin Chen, Rishi Chadha, Minie Zhang, Sherri Van Everen, Nicholas Buss, Michele Fiscella, Olivier Danos, Peter A. Campochiaro Source Type: research
An unbiased approach de-livers unexpected insight into torsin biology
This study considerably expands our understanding of torsin biology, while providing defined opportunities for future investigations of torsin function and dysfunction in human pathologies. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Sarah M. Prophet, Christian Schlieker Source Type: research
A tribute to Gerald Weissmann (1930–2019)
(Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Steven B. Abramson, Paul J. Anderson, Jill P. Buyon, Bruce N. Cronstein, Thoru Pederson, Mark R. Philips, Charles N. Serhan Source Type: research
Age-dependent SMN expression in disease-relevant tissue and implications for SMA treatment
CONCLUSIONS A normally occurring perinatal decrease in whole-tissue SMN protein levels supports efforts to initiate SMN-inducing therapies as soon after birth as possible. Limited ASO distribution to rostral spinal and brain regions in some patients likely limits clinical response of motor units in these regions for those patients. These results have important implications for optimizing treatment of SMA patients and warrant further investigations to enhance bioavailability of intrathecally administered ASOs.FUNDING SMA Foundation, SMART, NIH (R01-NS09677, R01-NS062269), Ionis Pharmaceuticals, and PTC Therapeutics. Biogen ...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Daniel M. Ramos, Constantin d’Ydewalle, Vijayalakshmi Gabbeta, Amal Dakka, Stephanie K. Klein, Daniel A. Norris, John Matson, Shannon J. Taylor, Phillip G. Zaworski, Thomas W. Prior, Pamela J. Snyder, David Valdivia, Christine L. Hatem, Ian Waters, Nikh Source Type: research
Nuclear envelope–localized torsinA-LAP1 complex regulates hepatic VLDL secretion and steatosis
Deciphering novel pathways that regulate liver lipid content has profound implications for understanding the pathophysiology of nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH). Recent evidence suggests that the nuclear envelope is a site of regulation of lipid metabolism, but there is limited appreciation of the responsible mechanisms and molecular components within this organelle. We showed that conditional hepatocyte deletion of the inner nuclear membrane protein lamina-associated polypeptide 1 (LAP1) causes defective VLDL secretion and steatosis, including intranuclear lipid accumulation...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Ji-Yeon Shin, Antonio Hernandez-Ono, Tatyana Fedotova, Cecilia Östlund, Michael J. Lee, Sarah B. Gibeley, Chun-Chi Liang, William T. Dauer, Henry N. Ginsberg, Howard J. Worman Source Type: research
Integrin α5β1 regulates PP2A complex assembly through PDE4D in atherosclerosis
Fibronectin in the vascular wall promotes inflammatory activation of the endothelium during vascular remodeling and atherosclerosis. These effects are mediated in part by fibronectin binding to integrin α5, which recruits and activates phosphodiesterase 4D5 (PDE4D5) by inducing its dephosphorylation on an inhibitory site, S651. Active PDE then hydrolyzes antiinflammatory cAMP to facilitate inflammatory signaling. To test this model in vivo, we mutated the integrin binding site of PDE4D5 in mice. This mutation reduced endothelial inflammatory activation in atherosclerosis-prone regions of arteries and, in a hyperlipid...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Sanguk Yun, Rui Hu, Melanie E. Schwaemmle, Alexander N. Scherer, Zhenwu Zhuang, Anthony J. Koleske, David C. Pallas, Martin A. Schwartz Source Type: research
p53-responsive TLR8 SNP enhances human innate immune response to respiratory syncytial virus
The Toll-like receptor 8 (TLR8) has an important role in innate immune responses to RNA viral infections, including respiratory syncytial virus (RSV). We previously reported that TLR8 expression was increased directly by the tumor suppressor and transcription factor p53 via a single nucleotide polymorphism (SNP) (rs3761624) in the TLR8 promoter, thereby placing TLR8 in the p53/immune axis. Because this SNP is in linkage disequilibrium with other SNPs associated with several infectious diseases, we addressed the combined influence of p53 and the SNP on downstream inflammatory signaling in response to a TLR8 cognate ssRNA li...
Source: Journal of Clinical Investigation - October 8, 2019 Category: Biomedical Science Authors: Daniel Menendez, Joyce Snipe, Jacqui Marzec, Cynthia L. Innes, Fernando P. Polack, Mauricio T. Caballero, Shepherd H. Schurman, Steven R. Kleeberger, Michael A. Resnick Source Type: research
The gut microbiome and metabolic syndrome
The metabolic syndrome (MetS) is a constellation of risk factors that, if left untreated, will often progress to greater metabolic defects such as type 2 diabetes and nonalcoholic fatty liver disease. While these risk factors have been established for over 40 years, the definition of MetS warrants reconsideration in light of the substantial data that have emerged from studies of the gut microbiome. In this Review we present the existing recent literature that supports the gut microbiome’s potential influence on the various risk factors of MetS. The interplay of the intestinal microbiota with host metabolism has been ...
Source: Journal of Clinical Investigation - October 2, 2019 Category: Biomedical Science Authors: Kruttika Dabke, Gustaf Hendrick, Suzanne Devkota Source Type: research
Contribution of adipogenesis to healthy adipose tissue expansion in obesity
The manner in which white adipose tissue (WAT) expands and remodels directly impacts the risk of developing metabolic syndrome in obesity. Preferential accumulation of visceral WAT is associated with increased risk for insulin resistance, whereas subcutaneous WAT expansion is protective. Moreover, pathologic WAT remodeling, typically characterized by adipocyte hypertrophy, chronic inflammation, and fibrosis, is associated with insulin resistance. Healthy WAT expansion, observed in the “metabolically healthy” obese, is generally associated with the presence of smaller and more numerous adipocytes, along with low...
Source: Journal of Clinical Investigation - October 2, 2019 Category: Biomedical Science Authors: Lavanya Vishvanath, Rana K. Gupta Source Type: research
Altered adipose tissue and adipocyte function in the pathogenesis of metabolic syndrome
Over the past decade, great progress has been made in understanding the complexity of adipose tissue biology and its role in metabolism. This includes new insights into the multiple layers of adipose tissue heterogeneity, not only differences between white and brown adipocytes, but also differences in white adipose tissue at the depot level and even heterogeneity of white adipocytes within a single depot. These inter- and intra-depot differences in adipocytes are developmentally programmed and contribute to the wide range of effects observed in disorders with fat excess (overweight/obesity) or fat loss (lipodystrophy). Rec...
Source: Journal of Clinical Investigation - October 2, 2019 Category: Biomedical Science Authors: C. Ronald Kahn, Guoxiao Wang, Kevin Y. Lee Source Type: research
Success in science: what we can learn from women artists
(Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Lona Mody, Joel D. Howell, Sanjay Saint Source Type: research
Early adaptive immune activation detected in monozygotic twins with prodromal multiple sclerosis
Multiple sclerosis (MS) is a disabling disease of the CNS. Inflammatory features of MS include lymphocyte accumulations in the CNS and cerebrospinal fluid (CSF). The preclinical events leading to established MS are still enigmatic. Here we compared gene expression patterns of CSF cells from MS-discordant monozygotic twin pairs. Six “healthy” co-twins, who carry a maximal familial risk for developing MS, showed subclinical neuroinflammation (SCNI) with small MRI lesions. Four of these subjects had oligoclonal bands (OCBs). By single-cell RNA sequencing of 2752 CSF cells, we identified clonally expanded CD8+ T ce...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Eduardo Beltrán, Lisa Ann Gerdes, Julia Hansen, Andrea Flierl-Hecht, Stefan Krebs, Helmut Blum, Birgit Ertl-Wagner, Frederik Barkhof, Tania Kümpfel, Reinhard Hohlfeld, Klaus Dornmair Source Type: research
JMJD3 regulates CD4+ T cell trafficking by targeting actin cytoskeleton regulatory gene Pdlim4
Histone H3K27 demethylase JMJD3 plays a critical role in gene expression and T cell differentiation. However, the role and mechanisms of JMJD3 in T cell trafficking remain poorly understood. Here, we show that JMJD3 deficiency in CD4+ T cells resulted in an accumulation of T cells in the thymus and reduction of T cell number in the secondary lymphoid organs. We identified PDLIM4 as a significantly downregulated target gene in JMJD3-deficient CD4+ T cells by gene profiling and ChIP-Seq analyses. We further showed that PDLIM4 functioned as an adaptor protein to interact with sphingosine-1 phosphate receptor 1 (S1P1) and fila...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Chuntang Fu, Qingtian Li, Jia Zou, Changsheng Xing, Mei Luo, Bingnan Yin, Junjun Chu, Jiaming Yu, Xin Liu, Helen Y. Wang, Rong-Fu Wang Source Type: research
Hotspot SF3B1 mutations induce metabolic reprogramming and vulnerability to serine deprivation
Cancer-associated mutations in the spliceosome gene SF3B1 create a neomorphic protein that produces aberrant mRNA splicing in hundreds of genes, but the ensuing biologic and therapeutic consequences of this missplicing are not well understood. Here we have provided evidence that aberrant splicing by mutant SF3B1 altered the transcriptome, proteome, and metabolome of human cells, leading to missplicing-associated downregulation of metabolic genes, decreased mitochondrial respiration, and suppression of the serine synthesis pathway. We also found that mutant SF3B1 induces vulnerability to deprivation of the nonessential amin...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: W. Brian Dalton, Eric Helmenstine, Noel Walsh, Lukasz P. Gondek, Dhanashree S. Kelkar, Abigail Read, Rachael Natrajan, Eric S. Christenson, Barbara Roman, Samarjit Das, Liang Zhao, Robert D. Leone, Daniel Shinn, Taylor Groginski, Anil K. Madugundu, Arun P Source Type: research
FOXN1 compound heterozygous mutations cause selective thymic hypoplasia in humans
We report on 2 patients with compound heterozygous mutations in forkhead box N1 (FOXN1), a transcription factor essential for thymic epithelial cell (TEC) differentiation. TECs are critical for T cell development. Both patients had a presentation consistent with T–/loB+NK+ SCID, with normal hair and nails, distinct from the classic nude/SCID phenotype in individuals with autosomal-recessive FOXN1 mutations. To understand the basis of this phenotype and the effects of the mutations on FOXN1, we generated mice using CRISPR-Cas9 technology to genocopy mutations in 1 of the patients. The mice with the Foxn1 compound hete...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Qiumei Du, Larry K. Huynh, Fatma Coskun, Erika Molina, Matthew A. King, Prithvi Raj, Shaheen Khan, Igor Dozmorov, Christine M. Seroogy, Christian A. Wysocki, Grace T. Padron, Tyler R. Yates, M. Louise Markert, M. Teresa de la Morena, Nicolai S.C. van Oers Source Type: research
Simplified steps to heterologous prime-boost HIV vaccine development?
The RV 144 HIV vaccine efficacy study showed a reduction in HIV-1 infection risk in Thai volunteers who received two priming vaccinations of vCP1521 ALVAC (attenuated recombinant canarypox virus expressing HIV group–specific antigen, polymerase, and envelope genes) followed by two additional ALVAC vaccinations and coadministration of purified bivalent gp120 proteins (AIDSVAX B/E). In this issue of the JCI, Rouphael et al. build on these results by substituting a DNA plasmid cocktail expressing HIV-1 subtype C group–specific antigen, polymerase, and envelope antigen genes (DNA-HIV-PT123) for ALVAC in a phase 1b ...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Nelson L. Michael Source Type: research
Better living through peptide-conjugated chemistry: next-generation antisense oligonucleotides
Two different antisense oligonucleotide–based (ASO-based) therapies are currently in clinical use to treat neuromuscular diseases. This success, for Duchenne muscular dystrophy and spinal muscular atrophy, offers hope not only for additional neuromuscular diseases, but also for other disorders that could benefit from RNA-targeted therapies. A major limitation for more widespread application of ASOs relates to relatively poor tissue penetration. In this issue of the JCI, Klein et al. showed that conjugating an ASO with an arginine-rich cell-penetrating peptide, Pip6a, enhanced delivery, resulting in corrective outcome...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Elizabeth M. McNally, Brian D. Leverson Source Type: research
Plasma deconvolution identifies broadly neutralizing antibodies associated with hepatitis C virus clearance
A vaccine for hepatitis C virus (HCV) is urgently needed. Development of broadly neutralizing plasma antibodies during acute infection is associated with HCV clearance, but the viral epitopes of these plasma antibodies are unknown. Identifying these epitopes could define the specificity and function of neutralizing antibodies (NAbs) that should be induced by a vaccine. Here, we present the development and application of a high-throughput method that deconvolutes polyclonal anti-HCV NAbs in plasma, delineating the epitope specificities of anti-HCV NAbs in acute-infection plasma of 44 humans with subsequent clearance or pers...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Valerie J. Kinchen, Guido Massaccesi, Andrew I. Flyak, Madeleine C. Mankowski, Michelle D. Colbert, William O. Osburn, Stuart C. Ray, Andrea L. Cox, James E. Crowe Jr, Justin R. Bailey Source Type: research
IFN-γ drives inflammatory bowel disease pathogenesis through VE-cadherin–directed vascular barrier disruption
Inflammatory bowel disease (IBD) is a chronic inflammatory disorder with rising incidence. Diseased tissues are heavily vascularized. Surprisingly, the pathogenic impact of the vasculature in IBD and the underlying regulatory mechanisms remain largely unknown. IFN-γ is a major cytokine in IBD pathogenesis, but in the context of the disease, it is almost exclusively its immune-modulatory and epithelial cell–directed functions that have been considered. Recent studies by our group demonstrated that IFN-γ also exerts potent effects on blood vessels. Based on these considerations, we analyzed the vessel-direc...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Victoria Langer, Eugenia Vivi, Daniela Regensburger, Thomas H. Winkler, Maximilian J. Waldner, Timo Rath, Benjamin Schmid, Lisa Skottke, Somin Lee, Noo Li Jeon, Thomas Wohlfahrt, Viktoria Kramer, Philipp Tripal, Michael Schumann, Stephan Kersting, Claudia Source Type: research
Peptide-conjugated oligonucleotides evoke long-lasting myotonic dystrophy correction in patient-derived cells and mice
Antisense oligonucleotides (ASOs) targeting pathologic RNAs have shown promising therapeutic corrections for many genetic diseases including myotonic dystrophy (DM1). Thus, ASO strategies for DM1 can abolish the toxic RNA gain-of-function mechanism caused by nucleus-retained mutant DMPK (DM1 protein kinase) transcripts containing CUG expansions (CUGexps). However, systemic use of ASOs for this muscular disease remains challenging due to poor drug distribution to skeletal muscle. To overcome this limitation, we test an arginine-rich Pip6a cell-penetrating peptide and show that Pip6a-conjugated morpholino phosphorodiamidate ...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Arnaud F. Klein, Miguel A. Varela, Ludovic Arandel, Ashling Holland, Naira Naouar, Andrey Arzumanov, David Seoane, Lucile Revillod, Guillaume Bassez, Arnaud Ferry, Dominic Jauvin, Genevieve Gourdon, Jack Puymirat, Michael J. Gait, Denis Furling, Matthew J Source Type: research
DNA priming and gp120 boosting induces HIV-specific antibodies in a randomized clinical trial
CONCLUSION The DNA/protein combination regimens induced high-magnitude and long-lasting HIV V1V2–binding antibody responses, and early coadministration of the 2 vaccines led to a more rapid induction of these potentially protective responses.TRIAL REGISTRATION ClinicalTrials.gov NCT02207920.FUNDING National Institute of Allergy and Infectious Diseases (NIAID) grants UM1 AI068614, UM1 AI068635, UM1 AI068618, UM1 AI069511, UM1 AI069470, UM1 AI069534, P30 AI450008, UM1 AI069439, UM1 AI069481, and UM1 AI069496; the National Center for Advancing Translational Sciences, NIH (grant UL1TR001873); and the Bill & Melinda G...
Source: Journal of Clinical Investigation - October 1, 2019 Category: Biomedical Science Authors: Nadine G. Rouphael, Cecilia Morgan, Shuying S. Li, Ryan Jensen, Brittany Sanchez, Shelly Karuna, Edith Swann, Magdalena E. Sobieszczyk, Ian Frank, Gregory J. Wilson, Hong-Van Tieu, Janine Maenza, Aliza Norwood, James Kobie, Faruk Sinangil, Giuseppe Pantal Source Type: research
Hungry for your alanine: when liver depends on muscle proteolysis
Fasting requires complex endocrine and metabolic interorgan crosstalk, which involves shifting from glucose to fatty acid oxidation, derived from adipose tissue lipolysis, in order to preserve glucose for the brain. The glucose-alanine (Cahill) cycle is critical for regenerating glucose. In this issue of JCI, Petersen et al. report on their use of an innovative stable isotope tracer method to show that skeletal muscle–derived alanine becomes rate controlling for hepatic mitochondrial oxidation and, in turn, for glucose production during prolonged fasting. These results provide new insight into skeletal muscle–l...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Theresia Sarabhai, Michael Roden Source Type: research
Stromal integrin α11 regulates PDGFRβ signaling and promotes breast cancer progression
Cancer-associated fibroblasts (CAFs) are key actors in modulating the progression of many solid tumors, such as breast cancer (BC). Herein, we identify an integrin α11/PDGFRβ–positive CAF subset displaying tumor-promoting features in BC. In the preclinical MMTV-PyMT mouse model, integrin α11 deficiency led to a drastic reduction of tumor progression and metastasis. A clear association between integrin α11 and PDGFRβ was found at both transcriptional and histological levels in BC specimens. High stromal integrin α11/PDGFRβ expression was associated with high grades and poorer cli...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Irina Primac, Erik Maquoi, Silvia Blacher, Ritva Heljasvaara, Jan Van Deun, Hilde Y.H. Smeland, Annalisa Canale, Thomas Louis, Linda Stuhr, Nor Eddine Sounni, Didier Cataldo, Taina Pihlajaniemi, Christel Pequeux, Olivier De Wever, Donald Gullberg, Agnès Source Type: research
HIV-1 in lymph nodes is maintained by cellular proliferation during antiretroviral therapy
To investigate the possibility that HIV-1 replication in lymph nodes sustains the reservoir during antiretroviral therapy (ART), we looked for evidence of viral replication in 5 donors after up to 13 years of viral suppression. We characterized proviral populations in lymph nodes and peripheral blood before and during ART, evaluated the levels of viral RNA expression in single lymph node and blood cells, and characterized the proviral integration sites in paired lymph node and blood samples. Proviruses with identical sequences, identical integration sites, and similar levels of RNA expression were found in lymph nodes and ...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: William R. McManus, Michael J. Bale, Jonathan Spindler, Ann Wiegand, Andrew Musick, Sean C. Patro, Michele D. Sobolewski, Victoria K. Musick, Elizabeth M. Anderson, Joshua C. Cyktor, Elias K. Halvas, Wei Shao, Daria Wells, Xiaolin Wu, Brandon F. Keele, Je Source Type: research
Obtaining prescription drugs in America: it’s no bargain
(Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Arthur L. Caplan Source Type: research
Peritoneal GATA6+ macrophages function as a portal for Staphylococcus aureus dissemination
Essentially all Staphylococcus aureus (S. aureus) bacteria that gain access to the circulation are plucked out of the bloodstream by the intravascular macrophages of the liver — the Kupffer cells. It is also thought that these bacteria are disseminated via the bloodstream to other organs. Our data show that S. aureus inside Kupffer cells grew and escaped across the mesothelium into the peritoneal cavity and immediately infected GATA-binding factor 6–positive (GATA6+) peritoneal cavity macrophages. These macrophages provided a haven for S. aureus, thereby delaying the neutrophilic response in the peritoneum by 4...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Selina K. Jorch, Bas G.J. Surewaard, Mokarram Hossain, Moritz Peiseler, Carsten Deppermann, Jennifer Deng, Ania Bogoslowski, Fardau van der Wal, Abdelwahab Omri, Michael J. Hickey, Paul Kubes Source Type: research
Recombinant annexin A6 promotes membrane repair and protects against muscle injury
Membrane repair is essential to cell survival. In skeletal muscle, injury often associates with plasma membrane disruption. Additionally, muscular dystrophy is linked to mutations in genes that produce fragile membranes or reduce membrane repair. Methods to enhance repair and reduce susceptibility to injury could benefit muscle in both acute and chronic injury settings. Annexins are a family of membrane-associated Ca2+-binding proteins implicated in repair, and annexin A6 was previously identified as a genetic modifier of muscle injury and disease. Annexin A6 forms the repair cap over the site of membrane disruption. To el...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Alexis R. Demonbreun, Katherine S. Fallon, Claire C. Oosterbaan, Elena Bogdanovic, James L. Warner, Jordan J. Sell, Patrick G. Page, Mattia Quattrocelli, David Y. Barefield, Elizabeth M. McNally Source Type: research
Elastase 3B mutation links to familial pancreatitis with diabetes and pancreatic adenocarcinoma
Although improvements in genetic analysis have greatly enhanced our understanding of the mechanisms behind pancreatitis, it continues to afflict many families for whom the hereditary factors remain unknown. Recent evaluation of a patient with a strong family history of pancreatitis prompted us to reexamine a large kindred originally reported over 50 years ago with an autosomal-dominant inheritance pattern of chronic pancreatitis, diabetes, and pancreatic adenocarcinoma. Whole-exome sequencing analysis identified a rare missense mutation in the gene encoding pancreas-specific protease elastase 3B (CELA3B) that cosegregates ...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Paul C. Moore, Jessica T. Cortez, Chester E. Chamberlain, Diana Alba, Amy C. Berger, Zoe Quandt, Alice Chan, Mickie H. Cheng, Jhoanne L. Bautista, Justin Peng, Michael S. German, Mark S. Anderson, Scott A. Oakes Source Type: research
Regulation of hepatic mitochondrial oxidation by glucose-alanine cycling during starvation in humans
In order to determine whether the glucose-alanine cycle regulates rates of hepatic mitochondrial oxidation in humans, we applied positional isotopomer NMR tracer analysis (PINTA) to assess rates of hepatic mitochondrial oxidation and pyruvate carboxylase flux in healthy volunteers following both an overnight (12 hours) and a 60-hour fast. Following the 60-hour fast, rates of endogenous glucose production and mitochondrial oxidation decreased, whereas rates of hepatic pyruvate carboxylase flux remained unchanged. These reductions were associated with reduced rates of alanine turnover, assessed by [3-13C]alanine, in a subgro...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Kitt Falk Petersen, Sylvie Dufour, Gary W. Cline, Gerald I. Shulman Source Type: research
Trials and tribulations of diabetes: a patient’s perspective
(Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Mary M. Meyer Source Type: research
Evidence-based recommendations for energy intake in pregnant women with obesity
The objective of this study was to characterize determinants of gestational weight gain in women with obesity.METHODS This was a prospective, observational study of pregnant women with obesity. The primary outcome was energy intake calculated by the energy intake-balance method. Energy expenditure was measured by doubly labeled water and whole-room indirect calorimetry and body composition as a 3-compartment model by air displacement plethysmography and isotope dilution in early (13–16 weeks) and late (35–37 weeks) pregnancy.RESULTS In pregnant women with obesity (n = 54), recommended weight gain (n = 8, 15%) d...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Jasper Most, Marshall St Amant, Daniel S. Hsia, Abby D. Altazan, Diana M. Thomas, L. Anne Gilmore, Porsha M. Vallo, Robbie A. Beyl, Eric Ravussin, Leanne M. Redman Source Type: research
Time to change weight gain recommendations for pregnant women with obesity
Obesity during pregnancy is a major health problem in the United States. In this issue of the JCI, Most et al. fill an important gap in our understanding of energy homeostasis in pregnancy. The researchers measured energy intake, energy expenditure, and body composition in obese pregnant women. They demonstrated that energy intake need not increase in order for obese women to gain the recommended amounts of weight during pregnancy. Additionally, all of the gestational weight gain scenarios (inadequate, recommended, or excess) resulted in similar maternal and fetal perinatal outcomes. This evidence should guide new recommen...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Sarah S. Comstock Source Type: research
Angiopoietin-like 4 binds neuropilins and cooperates with VEGF to induce diabetic macular edema
The majority of patients with diabetic macular edema (DME), the most common cause of vision loss in working-age Americans, do not respond adequately to current therapies targeting VEGFA. Here, we show that expression of angiopoietin-like 4 (ANGPTL4), a HIF-1–regulated gene product, is increased in the eyes of diabetic mice and patients with DME. We observed that ANGPTL4 and VEGF act synergistically to destabilize the retinal vascular barrier. Interestingly, while ANGPTL4 modestly enhanced tyrosine phosphorylation of VEGF receptor 2, promotion of vascular permeability by ANGPTL4 was independent of this receptor. Inste...
Source: Journal of Clinical Investigation - September 24, 2019 Category: Biomedical Science Authors: Akrit Sodhi, Tao Ma, Deepak Menon, Monika Deshpande, Kathleen Jee, Aumreetam Dinabandhu, Jordan Vancel, Daoyuan Lu, Silvia Montaner Source Type: research
Equity and diversity in academic medicine: a perspective from the JCI editors
(Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Linda M. S. Resar, Elizabeth M. Jaffee, Mary Armanios, Sarah Jackson, Nilofer S. Azad, Maureen R. Horton, Mariana J. Kaplan, Marikki Laiho, Marcela V. Maus, Charlotte J. Sumner, Sarah J. Wheelan, Marsha Wills-Karp Source Type: research
Targeting the mTOR pathway in idiopathic multicentric Castleman disease
This study models a precision medicine approach to discovering therapies for rare diseases. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Robert M. Stern, Nancy Berliner Source Type: research
Molecular profiling stratifies diverse phenotypes of treatment-refractory metastatic castration-resistant prostate cancer
Metastatic castration-resistant prostate cancer (mCRPC) is a heterogeneous disease with diverse drivers of disease progression and mechanisms of therapeutic resistance. We conducted deep phenotypic characterization of CRPC metastases and patient-derived xenograft (PDX) lines using whole-genome RNA sequencing, gene set enrichment analysis, and immunohistochemistry. Our analyses revealed 5 mCRPC phenotypes based on the expression of well-characterized androgen receptor (AR) or neuroendocrine (NE) genes: AR-high tumors (ARPC), AR-low tumors (ARLPC), amphicrine tumors composed of cells coexpressing AR and NE genes (AMPC), doub...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Mark P. Labrecque, Ilsa M. Coleman, Lisha G. Brown, Lawrence D. True, Lori Kollath, Bryce Lakely, Holly M. Nguyen, Yu C. Yang, Rui M. Gil da Costa, Arja Kaipainen, Roger Coleman, Celestia S. Higano, Evan Y. Yu, Heather H. Cheng, Elahe A. Mostaghel, Bruce Source Type: research
Innate and adaptive nasal mucosal immune responses following experimental human pneumococcal colonization
Streptococcus pneumoniae (Spn) is a common cause of respiratory infection, but also frequently colonizes the nasopharynx in the absence of disease. We used mass cytometry to study immune cells from nasal biopsy samples collected following experimental human pneumococcal challenge in order to identify immunological mechanisms of control of Spn colonization. Using 37 markers, we characterized 293 nasal immune cell clusters, of which 7 were associated with Spn colonization. B cell and CD161+CD8+ T cell clusters were significantly lower in colonized than in noncolonized subjects. By following a second cohort before and after p...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Simon P. Jochems, Karin de Ruiter, Carla Solórzano, Astrid Voskamp, Elena Mitsi, Elissavet Nikolaou, Beatriz F. Carniel, Sherin Pojar, Esther L. German, Jesús Reiné, Alessandra Soares-Schanoski, Helen Hill, Rachel Robinson, Angela D. Hyder-Wright, Caro Source Type: research
Immune overdrive signature in colorectal tumor subset predicts poor clinical outcome
The prognostic value of immune cell infiltration within the tumor microenvironment (TME) has been extensively investigated via histological and genomic approaches. Based on the positive prognostic value of T cell infiltration, Immunoscore has been developed and validated for predicting risk of recurrence for colorectal cancer (CRC). Also, association between a consensus T helper 1 (Th-1) immune response and favorable clinical outcomes has been observed across multiple cancer types. Here, we reanalyzed public genomic data sets from The Cancer Genome Atlas (TCGA) and NCBI Gene Expression Omnibus (NCBI-GEO) and performed mult...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Marwan Fakih, Ching Ouyang, Chongkai Wang, Travis Yiwey Tu, Maricel C. Gozo, May Cho, Marvin Sy, Jeffrey A. Longmate, Peter P. Lee Source Type: research
Revealing the molecular signaling pathways of mucus stasis in cystic fibrosis
Mucus obstruction is a hallmark of cystic fibrosis (CF) airway disease, leading to chronic infection, dysregulated inflammation, and progressive lung disease. As mucus hyperexpression is a key component in the initiation and perpetuation of airway obstruction, the triggers underlying mucin release must be identified and understood. In this issue of the JCI, Chen et al. sought to delineate the mechanisms that allow IL-1α/IL-1β to perpetuate the mucoinflammatory environment characteristic of the CF airway. The authors demonstrated that IL-1α and IL-1β stimulated non-CF human bronchial epithelial (HBE) c...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Susan E. Birket, Steven M. Rowe Source Type: research
IL-1β dominates the promucin secretory cytokine profile in cystic fibrosis
In conclusion, IL-1α and IL-1β are upstream components of a signaling pathway, including IL-1R1 and downstream SPDEF and ERN2, that generate a positive feedback cycle capable of producing persistent mucus hyperconcentration and IL-1α and/or IL-1β–mediated neutrophilic inflammation in the absence of infection in CF airways. Targeting this pathway therapeutically may ameliorate mucus obstruction and inflammation-induced structural damage in young CF children. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Gang Chen, Ling Sun, Takafumi Kato, Kenichi Okuda, Mary B. Martino, Aiman Abzhanova, Jennifer M. Lin, Rodney C. Gilmore, Bethany D. Batson, Yvonne K. O’Neal, Allison S. Volmer, Hong Dang, Yangmei Deng, Scott H. Randell, Brian Button, Alessandra Livraghi Source Type: research
Crystal deposition triggers tubule dilation that accelerates cystogenesis in polycystic kidney disease
We report that calcium oxalate (CaOx) crystal deposition led to rapid tubule dilation, activation of PKD-associated signaling pathways, and hypertrophy in tubule segments along the affected nephrons. Blocking mTOR signaling blunted this response and inhibited efficient excretion of lodged crystals. This mechanism of “flushing out” crystals by purposefully dilating renal tubules has not to our knowledge been previously recognized. Challenging PKD rat models with CaOx crystal deposition or inducing calcium phosphate deposition by increasing dietary phosphorus intake led to increased cystogenesis and disease progr...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Jacob A. Torres, Mina Rezaei, Caroline Broderick, Louis Lin, Xiaofang Wang, Bernd Hoppe, Benjamin D. Cowley Jr., Vincenzo Savica, Vicente E. Torres, Saeed Khan, Ross P. Holmes, Michal Mrug, Thomas Weimbs Source Type: research
Enhancing glycolysis attenuates Parkinson’s disease progression in models and clinical databases
Parkinson’s disease (PD) is a common neurodegenerative disease that lacks therapies to prevent progressive neurodegeneration. Impaired energy metabolism and reduced ATP levels are common features of PD. Previous studies revealed that terazosin (TZ) enhances the activity of phosphoglycerate kinase 1 (PGK1), thereby stimulating glycolysis and increasing cellular ATP levels. Therefore, we asked whether enhancement of PGK1 activity would change the course of PD. In toxin-induced and genetic PD models in mice, rats, flies, and induced pluripotent stem cells, TZ increased brain ATP levels and slowed or prevented neuron los...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Rong Cai, Yu Zhang, Jacob E. Simmering, Jordan L. Schultz, Yuhong Li, Irene Fernandez-Carasa, Antonella Consiglio, Angel Raya, Philip M. Polgreen, Nandakumar S. Narayanan, Yanpeng Yuan, Zhiguo Chen, Wenting Su, Yanping Han, Chunyue Zhao, Lifang Gao, Xunmi Source Type: research
Metabolically healthy obesity: facts and fantasies
Although obesity is typically associated with metabolic dysfunction and cardiometabolic diseases, some people with obesity are protected from many of the adverse metabolic effects of excess body fat and are considered “metabolically healthy.” However, there is no universally accepted definition of metabolically healthy obesity (MHO). Most studies define MHO as having either 0, 1, or 2 metabolic syndrome components, whereas many others define MHO using the homeostasis model assessment of insulin resistance (HOMA-IR). Therefore, numerous people reported as having MHO are not metabolically healthy, but simply have...
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: Gordon I. Smith, Bettina Mittendorfer, Samuel Klein Source Type: research
Identifying and targeting pathogenic PI3K/AKT/mTOR signaling in IL-6 blockade–refractory idiopathic multicentric Castleman disease
CONCLUSION This precision medicine approach identifies PI3K/Akt/mTOR signaling as the first pharmacologically targetable pathogenic process in IL-6 blockade–refractory iMCD. Prospective evaluation of sirolimus in treatment-refractory iMCD is planned (NCT03933904).FUNDING This study was supported by the Castleman’s Awareness & Research Effort/Castleman Disease Collaborative Network, Penn Center for Precision Medicine, University Research Foundation, Intramural NIH funding, and the National Heart Lung and Blood Institute. (Source: Journal of Clinical Investigation)
Source: Journal of Clinical Investigation - September 17, 2019 Category: Biomedical Science Authors: David C. Fajgenbaum, Ruth-Anne Langan, Alberto Sada Japp, Helen L. Partridge, Sheila K. Pierson, Amrit Singh, Daniel J. Arenas, Jason R. Ruth, Christopher S. Nabel, Katie Stone, Mariko Okumura, Anthony Schwarer, Fábio Freire Jose, Nelson Hamerschlak, Ger Source Type: research