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Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [human]

ABSTRACT: Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [human]

PROVIDER: PRJNA882125 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21632626.fastq.gz	Fastqsanger.gz
	SRR21632627.fastq.gz	Fastqsanger.gz
	SRR21632628.fastq.gz	Fastqsanger.gz
	SRR21632629.fastq.gz	Fastqsanger.gz
	SRR21632630.fastq.gz	Fastqsanger.gz

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Similar Datasets

Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [human]

Project description:Background: Tetraspanin-7 (Tspan7) is an islet autoantigen involved in autoimmune type 1 diabetes and known to regulate beta-cell L-type Ca2+ channel activity. However, the role of Tspan7 in pancreatic beta-cell function is not yet fully understood. Methods: Histological analyses were conducted using immunostaining. Whole-body metabolism was tested using glucose tolerance test. Islet hormone secretion was quantified using static batch incubation or dynamic perifusion. Beta-cell transmembrane currents, electrical activity and exocytosis were measured using whole-cell patch-clamping and capacitance measurements. Gene expression was studied using mRNA-sequencing and quantitative PCR. Results: Tspan7 is expressed in insulin-containing granules of pancreatic beta-cells. Tspan7-knockout mice (Tspan7 y/- mouse) exhibit reduced body weight and ad libitum plasma glucose but normal glucose tolerance. Tspan7y/- islets have normal insulin content and glucose- or tolbutamide-stimulated insulin secretion. Depolarisation-triggered Ca2+ current was enhanced in Tspan7y/- beta-cells, but beta-cell electrical activity and depolarisation-evoked exocytosis were unchanged suggesting that exocytosis was less sensitive to Ca2+. TSPAN7 knockdown (KD) in human pseudo-islets led to a significant reduction in high K+-stimulated insulin secretion. Transcriptomic analyses show that TSPAN7 KD in human pseudo-islets correlated with changes in genes involved in hormone secretion, apoptosis and ER stress. Consistent with rodent beta-cells, exocytotic Ca2+ sensitivity was reduced in a human beta cell line (EndoC-H1) following Tspan7 KD. Conclusion: Tspan7 is involved in the regulation of Ca2+-dependent exocytosis in beta-cells. Its function is more significant in human beta-cells than their rodent counterparts

2022-10-10 | GSE213730 | GEO

Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [mouse]

Project description:Background: Tetraspanin-7 (Tspan7) is an islet autoantigen involved in autoimmune type 1 diabetes and known to regulate beta-cell L-type Ca2+ channel activity. However, the role of Tspan7 in pancreatic beta-cell function is not yet fully understood. Methods: Histological analyses were conducted using immunostaining. Whole-body metabolism was tested using glucose tolerance test. Islet hormone secretion was quantified using static batch incubation or dynamic perifusion. Beta-cell transmembrane currents, electrical activity and exocytosis were measured using whole-cell patch-clamping and capacitance measurements. Gene expression was studied using mRNA-sequencing and quantitative PCR. Results: Tspan7 is expressed in insulin-containing granules of pancreatic beta-cells. Tspan7-knockout mice (Tspan7 y/- mouse) exhibit reduced body weight and ad libitum plasma glucose but normal glucose tolerance. Tspan7y/- islets have normal insulin content and glucose- or tolbutamide-stimulated insulin secretion. Depolarisation-triggered Ca2+ current was enhanced in Tspan7y/- beta-cells, but beta-cell electrical activity and depolarisation-evoked exocytosis were unchanged suggesting that exocytosis was less sensitive to Ca2+. TSPAN7 knockdown (KD) in human pseudo-islets led to a significant reduction in high K+-stimulated insulin secretion. Transcriptomic analyses show that TSPAN7 KD in human pseudo-islets correlated with changes in genes involved in hormone secretion, apoptosis and ER stress. Consistent with rodent beta-cells, exocytotic Ca2+ sensitivity was reduced in a human beta cell line (EndoC-bH1) following Tspan7 KD. Conclusion: Tspan7 is involved in the regulation of Ca2+-dependent exocytosis in beta-cells. Its function is more significant in human beta-cells than their rodent counterparts

2022-10-10 | GSE213729 | GEO

Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism

Project description:Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism

| PRJNA882124 | ENA

Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [mouse]

Project description:Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism [mouse]

| PRJNA882126 | ENA

OCaR1, a gatekeeper of lysosomal and granular Ca2+ release and regulated exocytosis

Project description:During exocytosis, a Ca2+ increase arises in close vicinity of secretory granules which is strictly prevented in resting cells. Granular Ca2+ homeostasis and its role in granular exocytosis are not well understood.

2018-08-14 | GSE110646 | GEO

Loss of tetraspanin-7 expression reduces pancreatic beta-cell exocytosis Ca2+ sensitivity but has limited effect on systemic metabolism

Project description:This SuperSeries is composed of the SubSeries listed below.

2022-10-10 | GSE213731 | GEO

OCaR1, a gatekeeper of lysosomal and granular Ca2+ release and regulated exocytosis

Project description:OCaR1, a gatekeeper of lysosomal and granular Ca2+ release and regulated exocytosis

| PRJNA434189 | ENA

Liver lipophagy ameliorates nonalcoholic steatohepatitis through lysosomal lipid exocytosis

Project description:Nonalcoholic steatohepatitis (NASH) is a progressive disorder with aberrant lipid accumulation and subsequent inflammatory and profibrotic response. Lipid reduction through cytoplasmic lipolysis might adversely worsen steatohepatitis, however, the effect of autophagic lipolysis, lipophagy, remains obscure. We engineered the adaptor protein to induce lipophagy with lipid droplet targeting signal and modified LC3 interacting region. Activating hepatocyte lipophagy obviously mitigated both steatosis and NASH pathology. Mechanistically, lipophagy promoted the excretion of lipid from liver via lysosomal exocytosis and attenuated harmful accumulation of nonesterified fatty acid. This exocytosis was dependent on Ca2+ signal unlike the lysosomal dysfunction-related exocytosis. High content compound screening identified alpelisib and digoxin, clinically-approved compounds, as effective activators of lipophagy. Administration of alpelisib or digoxin inhibited the transition to steatohepatitis in mice fed high fat with low methionine low choline diet. Given all these data, activating lipophagy may be a promising therapeutic approach to prevent NASH progression.

2023-05-15 | GSE185911 | GEO

Loss of tetraspanin-7 expression reduces pancreatic β-cell exocytosis Ca<sup>2+</sup> sensitivity but has limited effect on systemic metabolism.

Project description:BackgroundTetraspanin-7 (Tspan7) is an islet autoantigen involved in autoimmune type 1 diabetes and known to regulate β-cell L-type Ca2+ channel activity. However, the role of Tspan7 in pancreatic β-cell function is not yet fully understood.MethodsHistological analyses were conducted using immunostaining. Whole-body metabolism was tested using glucose tolerance test. Islet hormone secretion was quantified using static batch incubation or dynamic perifusion. β-cell transmembrane currents, electrical activity and exocytosis were measured using whole-cell patch-clamping and capacitance measurements. Gene expression was studied using mRNA-sequencing and quantitative PCR.ResultsTspan7 is expressed in insulin-containing granules of pancreatic β-cells and glucagon-producing α-cells. Tspan7 knockout mice (Tspan7y/- mouse) exhibit reduced body weight and ad libitum plasma glucose but normal glucose tolerance. Tspan7y/- islets have normal insulin content and glucose- or tolbutamide-stimulated insulin secretion. Depolarisation-triggered Ca2+ current was enhanced in Tspan7y/- β-cells, but β-cell electrical activity and depolarisation-evoked exocytosis were unchanged suggesting that exocytosis was less sensitive to Ca2+ . TSPAN7 knockdown (KD) in human pseudo-islets led to a significant reduction in insulin secretion stimulated by 20 mM K+ . Transcriptomic analyses show that TSPAN7 KD in human pseudo-islets correlated with changes in genes involved in hormone secretion, apoptosis and ER stress. Consistent with rodent β-cells, exocytotic Ca2+ sensitivity was reduced in a human β-cell line (EndoC-βH1) following Tspan7 KD.ConclusionTspan7 is involved in the regulation of Ca2+ -dependent exocytosis in β-cells. Its function is more significant in human β-cells than their rodent counterparts.

| S-EPMC9828109 | biostudies-literature

MYO18B promotes lysosomal exocytosis by facilitating focal adhesion maturation

Project description:Many cancer cells exhibit increased amounts of paucimannose glycans, which are truncated N-glycan structures rarely found in mammals. Paucimannosidic proteins are proposedly generated within lysosomes and exposed on the cell surface through a yet uncertain mechanism. In this study, we assured that paucimannosidic proteins in cancer cells are produced by lysosomal glycoside hydrolases and secreted via regulated lysosomal exocytosis, a process in which lysosomes are directly fused with the plasma membrane. Interestingly, lysosomal exocytosis preferentially occurred in the vicinity of focal adhesions, protein complexes connecting the actin cytoskeleton to the extracellular matrix. Through genome-wide knockout screening, we identified that MYO18B, an actin crosslinker, is required for focal adhesion maturation, facilitating lysosomal exocytosis and release of lysosomal proteins to the extracellular milieu. Our data suggest that the mechanosensitive cation channel PIEZO1 locally activated at focal adhesions imports Ca2+ necessary for lysosome-plasma membrane fusion. Collectively, our study unveiled an intimate relationship between lysosomal exocytosis and focal adhesion, shedding light on the unexpected interplay between lysosomal activities and cellular mechanosensing in cancer.

2025-01-14 | PXD051592 | Pride

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