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NF- κB-Dependent Upregulation of (Pro)Renin Receptor Mediates High NaCl-Induced Apoptosis in Mouse Inner Medullary Collecting Duct Cells.
In conclusion, PRR expression is induced by high NaCl through NF-κB and contributes to cell apoptosis under this circumstance. PMID: 29021196 [PubMed - as supplied by publisher]
Source: Am J Physiol Cell Ph... - October 11, 2017 Category: Cytology Authors: Su J, Liu X, Xu C, Lu X, Wang F, Fang H, Lu A, Qiu Q, Li C, Yang T Tags: Am J Physiol Cell Physiol Source Type: research

Ubiquitination of UVRAG by SMURF1 promotes autophagosome maturation and inhibits hepatocellular carcinoma growth.
Abstract UVRAG (UV radiation resistance associated) is an important regulator of mammalian macroautophagy/autophagy by interacting with BECN1, PIK3C3, and RUBCN. Phosphorylation of UVRAG by MTORC1 negatively regulates autophagosome maturation under nutrient-enriched conditions. However, how UVRAG ubiquitination is regulated is still unknown. Here we report that UVRAG is ubiquitinated by SMURF1 at lysine residues 517 and 559, which decreases the association of UVRAG with RUBCN and promotes autophagosome maturation. However, the deubiquitinase ZRANB1 specifically cleaves SMURF1-induced K29 and K33-linked polyubiquit...
Source: Autophagy - January 27, 2019 Category: Cytology Authors: Feng X, Jia Y, Zhang Y, Ma F, Zhu Y, Hong X, Zhou Q, He R, Zhang H, Jin J, Piao D, Huang H, Li Q, Qiu X, Zhang Z Tags: Autophagy Source Type: research

Mitochondrial respiratory chain deficiency inhibits lysosomal hydrolysis.
Abstract Mitochondria are key organelles for cellular metabolism, and regulate several processes including cell death and macroautophagy/autophagy. Here, we show that mitochondrial respiratory chain (RC) deficiency deactivates AMP-activated protein kinase (AMPK, a key regulator of energy homeostasis) signaling in tissue and in cultured cells. The deactivation of AMPK in RC-deficiency is due to increased expression of the AMPK-inhibiting protein FLCN (folliculin). AMPK is found to be necessary for basal lysosomal function, and AMPK deactivation in RC-deficiency inhibits lysosomal function by decreasing the activity...
Source: Autophagy - March 26, 2019 Category: Cytology Authors: Fernandez-Mosquera L, Yambire KF, Couto R, Pereyra L, Pabis K, Ponsford AH, Diogo CV, Stagi M, Milosevic I, Raimundo N Tags: Autophagy Source Type: research

STYK1 promotes autophagy through enhancing the assembly of autophagy-specific class III phosphatidylinositol 3-kinase complex I.
Abstract Macroautophagy/autophagy plays key roles in development, oncogenesis, and cardiovascular and metabolic diseases. Autophagy-specific class III phosphatidylinositol 3-kinase complex I (PtdIns3K-C1) is essential for autophagosome formation. However, the regulation of this complex formation requires further investigation. Here, we discovered that STYK1 (serine/threonine/tyrosine kinase 1), a member of the receptor tyrosine kinases (RTKs) family, is a new upstream regulator of autophagy. We discovered that STYK1 facilitated autophagosome formation in human cells and zebrafish, which was characterized by elevat...
Source: Autophagy - November 6, 2019 Category: Cytology Authors: Zhou C, Qian X, Hu M, Zhang R, Liu N, Huang Y, Yang J, Zhang J, Bai H, Yang Y, Wang Y, Ali D, Michalak M, Chen XZ, Tang J Tags: Autophagy Source Type: research

A food-responsive switch modulates TFEB and autophagy, and determines susceptibility to coxsackievirus infection and pancreatitis.
Abstract Almost a billion people worldwide are chronically undernourished. Herein, using a mouse model of coxsackievirus B3 (CVB3) infection, we report that a single day of food restriction (FR) markedly increases susceptibility to attenuated enterovirus infection, replication, and disease. These "pro-viral" effects, which are rapidly-reversed by the restoration of food, are mediated by several genes whose expression is altered by FR, and which support CVB3 replication. Central to this is TFEB, a protein whose expression and activation status are rapidly increased by FR. TFEB, which regulates the transcription of ...
Source: Autophagy - February 3, 2020 Category: Cytology Authors: Alirezaei M, Flynn CT, Garcia SD, Kimura T, Whitton JL Tags: Autophagy Source Type: research

MIR106A-5p upregulation suppresses autophagy and accelerates malignant phenotype in nasopharyngeal carcinoma.
Abstract Dysregulated microRNAs (miRNAs) are involved in carcinoma progression, metastasis, and poor prognosis. We demonstrated that in nasopharyngeal carcinoma (NPC), transactivated MIR106A-5p promotes a malignant phenotype by functioning as a macroautophagy/autophagy suppressor by targeting BTG3 (BTG anti-proliferation factor 3) and activating autophagy-regulating MAPK signaling. MIR106A-5p expression was markedly increased in NPC cases based on quantitative real-time PCR, miRNA microarray, and TCGA database analysis findings. Moreover, MIR106A-5p was correlated with advanced stage, recurrence, and poor clinical...
Source: Autophagy - July 4, 2020 Category: Cytology Authors: Zhu Q, Zhang Q, Gu M, Zhang K, Xia T, Zhang S, Chen W, Yin H, Yao H, Fan Y, Pan S, Xie H, Liu H, Cheng T, Zhang P, Zhang T, You B, You Y Tags: Autophagy Source Type: research

JUP/plakoglobin is regulated by salt-inducible kinase 2, and is required for insulin-induced signalling and glucose uptake in adipocytes.
CONCLUSIONS: These findings identify JUP as a novel player in the regulation of insulin sensitivity in adipocytes, and suggest that changes in JUP expression could contribute to the effect of SIK2 on insulin signalling in these cells. PMID: 32966883 [PubMed - as supplied by publisher]
Source: Cellular Signalling - September 19, 2020 Category: Cytology Authors: Negoita F, Vavakova M, Säll J, Laurencikiene J, Göransson O Tags: Cell Signal Source Type: research

HYPK coordinates degradation of polyneddylated proteins by autophagy
Autophagy. 2021 Nov 26:1-22. doi: 10.1080/15548627.2021.1997053. Online ahead of print.ABSTRACTSelective degradation of protein aggregates by macroautophagy/autophagy is an essential homeostatic process of safeguarding cells from the effects of proteotoxicity. Among the ubiquitin-like proteins, NEDD8 conjugation to misfolded proteins is prominent in stress-induced protein aggregates, albeit the function of neddylation in autophagy is unclear. Here, we report that polyneddylation functions as a post-translational modification for autophagic degradation of proteotoxic-stress induced protein aggregates. We also show that HYPK...
Source: Autophagy - November 27, 2021 Category: Cytology Authors: Debasish Kumar Ghosh Akash Ranjan Source Type: research

The FACT complex facilitates expression of lysosomal and antioxidant genes through binding to TFEB and TFE3
Autophagy. 2022 Mar 1:1-17. doi: 10.1080/15548627.2022.2029671. Online ahead of print.ABSTRACTTFEB (transcription factor EB) and TFE3 (transcription factor binding to IGHM enhancer 3) orchestrate the cellular response to a variety of stressors, including nutrient deprivation, oxidative stress and pathogens. Here we describe a novel interaction of TFEB and TFE3 with the FAcilitates Chromatin Transcription (FACT) complex, a heterodimeric histone chaperone consisting of SSRP1 and SUPT16H that mediates nucleosome disassembly and assembly, thus facilitating transcription. Extracellular stimuli, such as nutrient deprivation or o...
Source: Autophagy - March 1, 2022 Category: Cytology Authors: Eutteum Jeong Jos é A Martina Pablo S Contreras Juhyung Lee Rosa Puertollano Source Type: research