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Pituitary P62 deficiency leads to female infertility by impairing luteinizing hormone production
Exp Mol Med. 2021 Aug 27. doi: 10.1038/s12276-021-00661-4. Online ahead of print.ABSTRACTP62 is a protein adaptor for various metabolic processes. Mice that lack p62 develop adult-onset obesity. However, investigations on p62 in reproductive dysfunction are rare. In the present study, we explored the effect of p62 on the reproductive system. P62 deficiency-induced reproductive dysfunction occurred at a young age (8 week old). Young systemic p62 knockout (p62-/-) and pituitary-specific p62 knockout (p62flox/flox αGSUcre) mice both presented a normal metabolic state, whereas they displayed infertility phenotypes (attenuated...
Source: Molecular Medicine - August 28, 2021 Category: Molecular Biology Authors: Xing Li Ling Zhou Guiliang Peng Mingyu Liao Linlin Zhang Hua Hu Ling Long Xuefeng Tang Hua Qu Jiaqing Shao Hongting Zheng Min Long Source Type: research

AMPK upregulates KCa2.3 channels and ameliorates endothelial dysfunction in diet-induced obese mice.
Abstract The opening of endothelial small-conductance calcium-activated potassium channels (KCa2.3) is essential for endothelium-dependent hyperpolarization (EDH), which predominantly occurs in small resistance arteries. Adenosine monophosphate-activated protein kinase (AMPK), an important metabolic regulator, has been implicated in regulating endothelial nitric oxide synthase activity. However, it was unclear whether AMPK regulated endothelial KCa2.3-mediated EDH-type vasodilation. Using bioinformatics analysis and myograph system, we investigated the regulation by AMPK of KCa2.3 in human umbilical vein endotheli...
Source: Biochemical Pharmacology - November 10, 2020 Category: Drugs & Pharmacology Authors: Pang ZD, Wang Y, Song Z, She G, Ma XZ, Sun X, Wu W, Lai BC, Zhang J, Zhang Y, Du XJ, Shyy JYJ, Deng XL Tags: Biochem Pharmacol Source Type: research

GPR120 regulates pancreatic polypeptide secretion from male mouse islets via PLC-mediated calcium mobilization.
In this study, GPR120-IRES-EGFP knockin (KI) mouse was generated to identify GPR120-expressing cells with enhance green fluorescence proteins (EGFP). EGFP-positive cells collected from the KI mouse islets by flow cytometry had significantly higher expression of pancreatic polypeptide (PP) evidenced by RT-qPCR. Single cell RT-PCR and immunocytochemical double staining also demonstrated the co-expression of GPR120 with PP in mouse islets. GPR120 specific agonist, TUG-891, significantly increased plasma PP levels in mice. TUG-891 significantly increased PP levels in islet medium in vitro, which was markedly attenuated by GPR1...
Source: Endocrinology - September 1, 2020 Category: Endocrinology Authors: Zhao YF, Li XC, Liang XY, Zhao YY, Xie R, Zhang LJ, Zhang XC, Chen C Tags: Endocrinology Source Type: research

Calcium sensing receptor activation in THP-1 macrophages triggers NLRP3 inflammasome and human preadipose cell inflammation
Publication date: Available online 15 November 2019Source: Molecular and Cellular EndocrinologyAuthor(s): Amanda D'Espessailles, Natalia Santillana, Sofía Sanhueza, Cecilia Fuentes, Mariana CifuentesAbstractExcess adipose tissue (AT) associates with inflammation and obesity-related diseases. We studied whether calcium-sensing receptor (CaSR)-mediated NLRP3 inflammasome activation in THP-1 macrophages elevates inflammation in LS14 preadipocytes, modeling deleterious AT cell crosstalk. THP-1 macrophages exposed to Cinacalcet (CaSR activator, 2 μM, 4 h) showed elevated proinflammatory marker and NLRP3 inflammasome mRNA,...
Source: Molecular and Cellular Endocrinology - November 15, 2019 Category: Endocrinology Source Type: research

The TRPC6-AMPK Pathway is Involved in Insulin-Dependent Cytoskeleton Reorganization and Glucose Uptake in Cultured Rat Podocytes
Conclusion: These results suggest a potentially important new mechanism that regulates glucose transport in podocytes and that could be injurious during diabetes.Cell Physiol Biochem 2018;51:393 –410
Source: Cellular Physiology and Biochemistry - November 19, 2018 Category: Cytology Source Type: research

A Novel Adipokine, FAM19A5, Inhibits Postinjury Neointima Formation through Sphingosine-1-Phosphate Receptor 2.
Conclusions -We revealed that a novel adipokine, FAM19A5, was capable of inhibiting postinjury neointima formation via S1PR2-G12/13-RhoA signaling. Downregulation of FAM19A5 during obesity may trigger cardiometabolic diseases. PMID: 29453251 [PubMed - as supplied by publisher]
Source: Circulation - February 16, 2018 Category: Cardiology Authors: Wang Y, Chen D, Zhang Y, Wang P, Zheng C, Zhang S, Yu B, Zhang L, Zhao G, Ma B, Cai Z, Xie N, Huang S, Liu Z, Mo X, Guan Y, Wang X, Fu Y, Ma D, Wang Y, Kong W Tags: Circulation Source Type: research

High-fat-diet induces airway hyperresponsiveness partly through activating CD38 signaling pathway.
This study aimed to detect the effect of CD38 signaling pathway on the AHR of overweight/obese mice. The HFD-fed mice exhibited a significantly higher baseline airway resistance (Rn), and the increasing rates of Rn responded to increasing doses of methacholine compared with the LFD-fed mice. High-fat-diet increased CD38 expressions both in lung tissues and primary cultured ASMCs. Besides, preincubation with TNF-α led to a higher expression of CD38 protein and increased intracellular calcium in ASMC of the HFD-fed mice. Furthermore, CD38 gene knockdown through transfection of CD38 siRNA decreased the concentration of intra...
Source: International Immunopharmacology - February 1, 2018 Category: Allergy & Immunology Authors: Chong L, Zhang W, Yu G, Zhang H, Zhu L, Li H, Shao Y, Li C Tags: Int Immunopharmacol Source Type: research

Calcium ‐sensing receptor activates the NLRP3 inflammasome in LS14 preadipocytes mediated by ERK1/2 signaling
This article is protected by copyright. All rights reserved
Source: Journal of Cellular Physiology - January 18, 2018 Category: Cytology Authors: Amanda D'Espessailles, Yuly A Mora, Cecilia Fuentes, Mariana Cifuentes Tags: ORIGINAL RESEARCH ARTICLE Source Type: research

Leptin induces ROS via NOX5 in healthy and neoplastic mammary epithelial cells.
Authors: Mahbouli S, Der Vartanian A, Ortega S, Rougé S, Vasson MP, Rossary A Abstract NADPH oxidase (NOX) complexes (a family of seven isoforms) drive cellular ROS production in patho-logical processes such as cancer. NOX-driven ROS production is involved in cell mechanisms from signalling to oxidative stress. Leptin, an adipokine overexpressed in obese patients, has been investigated in studies on breast carcinogenesis, but its effects on oxidative stress remain largely unexplored, especially in breast cancer. The study used three human mammary epithelial cell models presenting different neoplastic status (healt...
Source: Oncology Reports - October 20, 2017 Category: Cancer & Oncology Tags: Oncol Rep Source Type: research

A Hypothalamic Leptin-Glutamate Interaction in the Regulation of Sympathetic Nerve Activity.
In conclusion, these studies provide evidence that within the hypothalamic nuclei, leptin-glutamate signaling regulates the sympathetic activation. This may contribute to the sympathoexcitation commonly observed in obesity-related T2D. PMID: 28845307 [PubMed - in process]
Source: Neural Plasticity - August 30, 2017 Category: Neurology Authors: Zheng H, Liu X, Li Y, Patel KP Tags: Neural Plast Source Type: research

Preadipocyte proliferation is elevated by calcium sensing receptor activation
This study evaluated whether CaSR activation elevates preadipocyte proliferation. Human LS14 preadipocytes were exposed to CaSR activators cinacalcet (2 µM), GdCl3 (5 µM) and spermine (1 µM), and cell viability was evaluated after 72h. CaSR activators elevated proliferation by 19–24%, and CaSR silencing (siRNA) abolished the effect. Cinacalcet elevated phospho-ERK1/2 content, and upstream inhibition of ERK1/2 phosphorylation reverted cinacalcet-induced proliferation. Cinacalcet also elevated expression of the proinflammatory factors IL1β, IL6 and CCL2. The results suggest that CaSR induces preadipocyte prolifer...
Source: Molecular and Cellular Endocrinology - July 24, 2015 Category: Endocrinology Source Type: research