Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

RyR2/IRBIT regulates insulin gene transcription, insulin content, and secretion in the insulinoma cell line INS-1

ABSTRACT: The role of ER Ca2+ release via ryanodine receptors (RyR) in pancreatic B-cell function is not well defined. Deletion of RyR2 from the rat insulinoma INS-1 enhanced the Ca2+ integral (AUC) stimulated by glucose, and reduced levels of the protein IRBIT (AHCYL1). Deletion of IRBIT increased the Ca2+ AUC in response to glucose via enhanced IP3 receptor activity. Insulin content, basal and glucose-stimulated insulin secretion (GSIS), and INS2 mRNA levels were reduced in both RyR2KO and IRBITKO cells. Nuclear localization of S-adenosylhomocysteinase (AHCY) was increased in RyR2KO and IRBITKO cells, and exon 2 of the INS1 and INS2 genes was more extensively methylated in RyR2KO and IRBITKO cells. Deletion of RyR2 or IRBIT resulted in differential regulation of 314 and 137 proteins, respectively, with 41 in common. We conclude that RyR2 regulates IRBIT levels in INS-1 cells, and together regulate insulin content, GSIS, and the proteome, perhaps via DNA methylation.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Rattus Norvegicus (ncbitaxon:10116)

SUBMITTER: Gregory Hockerman

PROVIDER: MSV000088344 | MassIVE | Wed Nov 10 10:19:00 GMT 2021

REPOSITORIES: MassIVE

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Impact of Preoperative Oral Branched-chain Amino Acids on Reducing Postoperative Insulin Resistance.

Project description:Postoperative insulin resistance refers to the phenomenon that the body’s glucose uptake stimulated by insulin is reduced due to stress effects such as trauma or the inhibitory effect of insulin on liver glucose output is weakened after surgery. There is a clear link between postoperative insulin resistance and poor perioperative prognosis. Therefore, exploring interventions to reduce postoperative stress insulin resistance, stabilize postoperative blood glucose, and reduce postoperative complications are clinical problems that need to be solved urgently. In recent years, research on branched-chain amino acids and metabolic diseases has become a hot spot. Studies have found that in the rat model, preoperatively given a high branched-chain amino acid diet can inhibit postoperative insulin resistance and stabilize blood glucose levels. This research plan is to try to add branched-chain amino acids before surgery to observe the occurrence of postoperative insulin resistance in patients.

| 2744698 | ecrin-mdr-crc

Beta-cell specific insulin resistance promotes glucose-stimulated insulin hypersecretion

Project description:Beta-cell specific insulin resistance promotes glucose-stimulated insulin hypersecretion

| PRJNA669991 | ENA

Selenomethionine Modulates Insulin Secretion in the MIN6-K8 Mouse Insulinoma Cell Line

Project description:Selenium is an essential trace element that has gained interest for its potential role in glucose homeostasis. The purpose of the present study was to investigate the impact of selenium supplementation as selenomethionine (SeMet) on insulin secretion in MIN6-K8 cells, a model of pancreatic -cells. We found that 40 μM and 80 μM SeMet significantly enhanced percent insulin secretion at low (2.8 mM), intermediate (11.7 mM), and high (16.7 mM) glucose stimulation. SeMet also increased tolbutamide- or KCl-induced percent insulin secretion at 40 μM and 80 μM. Ca2+ influx was only reduced with 80 μM SeMet. RNA-sequencing showed that 40 μM SeMet supplementation upregulated expression of selenoprotein H (SelH) and thioredoxin reductase 1 (Txnrd 1) and downregulated expression of glutathione peroxidase 3 (Gpx3), selenoprotein O (SelO), and selenoprotein P (SelP). Gpx3 knockdown increased both percent and total insulin release with high glucose stimulation. SelP knockdown increased insulin release at high glucose. In conclusion, high SeMet supplementation augments insulin secretion, while reductions in Gpx3 and SelP expression, from SeMet supplementation or via silencing, augment -cell function in the MIN6-K8 cell line. These studies support a putative role for selenium and selenoproteins in the regulation of glucose homeostasis and diabetes risk.

2024-03-13 | GSE183775 | GEO

GABA, glucose and insulin orchestrate CD4+ T cells effector functions

Project description:Metabolic programs of immune cells are closely linked to their effector functions , where physiological molecules provide environmental cues and guidance. Exactly how it happens is still being unraveled. Insulin maintains normal blood glucose levels and glucose is themain source of energy and a precursor for many biomolecules in T cells, whereas γ-aminobutyric acid (GABA), best known as a neurotransmitter, is increasingly recognized as a regulatory molecule in the immune system. Here, we demonstrate that GABA-mediated reduction of metabolic activity and release of inflammatory molecules, including IFNγ and IL-10, was abolished in human CD4+ T cells, when the glucose concentration was elevated above normal levels. In a glucose concentration-dependent manner, insulin enhanced the GABAA receptors activated currents and GABA-dependent Ca2+ influx. GABA decreased, whereas insulin maintained glycolysis but in a SGLT (Na + -glucose transporter)-dependent manner, revealing expression of SGLTs in activated CD4+ T cells. The SGLTs antagonist phlorizin, alone or together with GABA, restored the inhibition of IFNγ and IL-10 release in presence of high glucose. This study exposes concerted effects of GABA, glucose and insulin on CD4+ T cells metabolic activity and release of inflammatory molecules, and identifies a role for SGLTs in CD4+ T cells function.

2024-08-10 | PXD041654 | Pride

Bezafibrate improves insulin sensitivity and metabolic flexibility in STZ-treated diabetic mice

Project description:Bezafibrate (BEZ), a pan activator of peroxisome proliferator-activated receptors (PPARs), is generally used to treat hyperlipidemia. Clinical trials on patients suffering from type 2 diabetes indicated that BEZ also has beneficial effects on glucose metabolism, but the underlying mechanisms remain elusive. Much less is known about the function of BEZ in type 1 diabetes. Here, we show that BEZ treatment markedly improves hyperglycemia, glucose and insulin tolerance in streptozotocin (STZ)-treated mice, an insulin-deficient mouse model of type 1 diabetes presenting with very high blood glucose levels. Furthermore, BEZ-treated mice also exhibited improved metabolic flexibility as well as an enhanced mitochondrial mass and function in the liver. Our data demonstrate a beneficial effect of BEZ treatment on STZ mice reducing diabetes and suggest that BEZ ameliorates impaired glucose metabolism possibly via augmented hepatic mitochondrial performance, improved insulin sensitivity and metabolic flexibility. We performed gene expression microarray analysis on liver tissue derived from streptozotocin-treated mice treated with bezafibrate in addition.

2016-06-29 | E-GEOD-79008 | biostudies-arrayexpress

Nutrient regulation of the islet epigenome controls adaptive insulin secretion

Project description:Adaptation of the islet β-cell insulin secretory response to changing insulin demand is critical for blood glucose homeostasis, yet the mechanisms underlying this adaptation are unknown. Here, we show that nutrient cues adapt insulin secretion by modulating chromatin state and transcription of genes regulating β-cell nutrient sensing and metabolism. Feeding stimulates histone acetylation at sites occupied by the chromatin-modifying enzyme Lsd1 in islets. We demonstrate that β-cell-specific deletion of Lsd1 leads to insulin hypersecretion, aberrant expression of nutrient response genes, and histone hyperacetylation, features we also observed in the db/db model of chronically increased insulin demand. Moreover, genetic variants associated with fasting glucose levels and type 2 diabetes risk are enriched at LSD1-bound sites in human islets, suggesting interindividual variation in β-cell functional adaptation in humans. These findings reveal nutrient state-dependent modulation of the islet epigenome and identify Lsd1 as a regulator of feeding-stimulated chromatin modification and adaptive insulin secretion.

2023-02-24 | GSE134901 | GEO

Transforming growth factor beta-like stimulated clone 22 D4 promotes diabetic hyperglycemia and insulin resistance [skeletal muscle]

Project description:Obesity-related insulin resistance represents the core component of the so-called Metabolic Syndrome, ultimately promoting glucose intolerance, pancreatic beta cell failure, and overt type 2 diabetes 1 2. Based on substantial side effects of existing pharmacological approaches, efficient and safe insulin sensitization and glucose control remain critical therapeutic aims to prevent diabetic late complications. Here, we identify Transforming Growth Factor beta-like Stimulated Clone (TSC) 22 D4 as a critical molecular determinant of insulin signaling and glucose handling. Hepatocyte-specific inactivation of TSC22D4 enhanced insulin signaling in liver and skeletal muscle, while hepatic TSC22D4 overexpression blunted insulin tissue responses. Consequently, hepatic TSC22D4 inhibition both prevented and reversed hyperglycemia, glucose intolerance, and insulin resistance in various diabetes mouse models, respectively. TSC22D4 was found to exert its effects on systemic glucose homeostasis –in large parts- through the transcriptional regulation of the small secretory protein lipocalin (LCN) 13 as demonstrated by chromatin recruitment and genetic rescue experiments in vivo. As hepatic TSC22D4 levels were found to be elevated in human diabetic patients, correlating with decreased insulin sensitivity and hyperglycemia, our results establish the inhibition of TSC22D4 as an attractive insulin sensitizing option in diabetes therapy.

2014-10-15 | GSE53754 | GEO

Transforming growth factor beta-like stimulated clone 22 D4 promotes diabetic hyperglycemia and insulin resistance [abdominal fat]

Project description:Obesity-related insulin resistance represents the core component of the so-called Metabolic Syndrome, ultimately promoting glucose intolerance, pancreatic beta cell failure, and overt type 2 diabetes 1 2. Based on substantial side effects of existing pharmacological approaches, efficient and safe insulin sensitization and glucose control remain critical therapeutic aims to prevent diabetic late complications 3. Here, we identify Transforming Growth Factor beta-like Stimulated Clone (TSC) 22 D4 as a critical molecular determinant of insulin signaling and glucose handling. Hepatocyte-specific inactivation of TSC22D4 enhanced insulin signaling in liver and skeletal muscle, while hepatic TSC22D4 overexpression blunted insulin tissue responses. Consequently, hepatic TSC22D4 inhibition both prevented and reversed hyperglycemia, glucose intolerance, and insulin resistance in various diabetes mouse models, respectively. TSC22D4 was found to exert its effects on systemic glucose homeostasis - in large parts - through the transcriptional regulation of the small secretory protein lipocalin (LCN) 13 as demonstrated by chromatin recruitment and genetic rescue experiments in vivo. As hepatic TSC22D4 levels were found to be elevated in human diabetic patients, correlating with decreased insulin sensitivity and hyperglycemia, our results establish the inhibition of TSC22D4 as an attractive insulin sensitizing option in diabetes therapy.

2014-10-15 | GSE53753 | GEO

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

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data