Dataset Information

Agonist-induced membrane nanodomain clustering drives GLP-1 receptor responses in pancreatic beta cells.

ABSTRACT: The glucagon-like peptide-1 receptor (GLP-1R), a key pharmacological target in type 2 diabetes (T2D) and obesity, undergoes rapid endocytosis after stimulation by endogenous and therapeutic agonists. We have previously highlighted the relevance of this process in fine-tuning GLP-1R responses in pancreatic beta cells to control insulin secretion. In the present study, we demonstrate an important role for the translocation of active GLP-1Rs into liquid-ordered plasma membrane nanodomains, which act as hotspots for optimal coordination of intracellular signaling and clathrin-mediated endocytosis. This process is dynamically regulated by agonist binding through palmitoylation of the GLP-1R at its carboxyl-terminal tail. Biased GLP-1R agonists and small molecule allosteric modulation both influence GLP-1R palmitoylation, clustering, nanodomain signaling, and internalization. Downstream effects on insulin secretion from pancreatic beta cells indicate that these processes are relevant to GLP-1R physiological actions and might be therapeutically targetable.

SUBMITTER: Buenaventura T

PROVIDER: S-EPMC6716783 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Agonist-induced membrane nanodomain clustering drives GLP-1 receptor responses in pancreatic beta cells.

Buenaventura Teresa T Bitsi Stavroula S Laughlin William E WE Burgoyne Thomas T Lyu Zekun Z Oqua Affiong I AI Norman Hannah H McGlone Emma R ER Klymchenko Andrey S AS Corrêa Ivan R IR Walker Abigail A Inoue Asuka A Hanyaloglu Aylin A Grimes Jak J Koszegi Zsombor Z Calebiro Davide D Rutter Guy A GA Bloom Stephen R SR Jones Ben B Tomas Alejandra A

PLoS biology 20190820 8

The glucagon-like peptide-1 receptor (GLP-1R), a key pharmacological target in type 2 diabetes (T2D) and obesity, undergoes rapid endocytosis after stimulation by endogenous and therapeutic agonists. We have previously highlighted the relevance of this process in fine-tuning GLP-1R responses in pancreatic beta cells to control insulin secretion. In the present study, we demonstrate an important role for the translocation of active GLP-1Rs into liquid-ordered plasma membrane nanodomains, which ac ...[more]

PMID: 31430273

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Project description:ImportanceConcerns have been raised regarding a link between use of glucagon-like peptide-1 (GLP-1) receptor agonists and increased risk of suicidality and self-harm.ObjectiveTo assess the association between use of GLP-1 receptor agonists and the risk of suicide death in routine clinical practice.Design, setting, and participantsThis active-comparator new-user cohort study used nationwide register data from Sweden and Denmark from 2013 to 2021. Adults 18 to 84 years old who initiated treatment with GLP-1 receptor agonists or the comparator sodium-glucose cotransporter-2 (SGLT2) inhibitors were included. Data were analyzed from March to June 2024.ExposureInitiation of treatment with a GLP-1 receptor agonist or SGLT2 inhibitor.Main outcomes and measuresThe primary outcome was suicide death recorded in the cause of death registers. Secondary outcomes were the composite of suicide death and nonfatal self-harm and the composite of incident depression and anxiety-related disorders. Using propensity score weighting, hazard ratios (HRs) with 95% CIs were calculated separately in the 2 countries and pooled in a meta-analysis.ResultsIn total, 124 517 adults initiated a GLP-1 receptor agonist and 174 036 initiated an SGLT2 inhibitor; among GLP-1 receptor agonist users, the mean (SD) age was 60 (13) years, and 45% were women. During a mean (SD) follow-up of 2.5 (1.7) years, 77 suicide deaths occurred among users of GLP-1 receptor agonists and 71 suicide deaths occurred among users of SGLT2 inhibitors: weighted incidences were 0.23 vs 0.18 events per 1000 person-years (HR, 1.25; 95% CI, 0.83-1.88), with an absolute difference of 0.05 (95% CI, -0.03 to 0.16) events per 1000 person-years. The HR was 0.83 (95% CI, 0.70-0.97) for suicide death and nonfatal self-harm, and the HR was 1.01 (95% CI, 0.97-1.06) for incident depression and anxiety-related disorders.Conclusions and relevanceThis cohort study, including mostly patients with type 2 diabetes, does not show an association between use of GLP-1 receptor agonists and an increased risk of suicide death, self-harm, or incident depression and anxiety-related disorders. Suicide death among GLP-1 receptor agonist users was rare, and the upper limit of the confidence interval was compatible with an absolute risk increase of no more than 0.16 events per 1000 person-years.

Project description:B6.Cg-Lep ob/ob mice females were surgically implanted in an age of 10-12 weeks with Alzet osmotic mini pumps (model 1002, 0,25l/h, Cupertino, CA, USA) in two groups of ten mice each to perform continuous subcutaneous infusions of Dulbecco's phosphate buffered saline (vehicle; n = 8) or GLP-1 (GLP-1; n = 9) agonist Liraglutide (Victoza, batch# CS6C214, Novo Nordisk A/S, Bagsvaerd, Denmark) to investigate the effects of the respective treatment on peri-gonadal epididymal white adipose tissue gene expression. Vehicle or Liraglutide at a dose of 600 g/kg/d were continuously infused (at a dose of 600 g/kg/d) over a 14 days period. On the morning after the osmotic mini pump reservoirs liquid content should have been consumed mice were dissected to remove the peri-gonadal epididymal fat pad for white adipose tissue gene expression analysis. At least 220 mg of white adipose tissue was quickly removed, shock-frozen in liquid nitrogen and thereafter stored at -80C for mRNA extraction. To perform RNA-Seq analysis, samples were single-end sequenced at a depth of 75 80M reads per sample with a read-length of 51 bp using an Illumina Hiseq2500. Raw sequencing files were quality controlled with FastQC. Alignment and trimming of reads was performed using the OSA algorithm against the mouse reference genome b38.1 with RefSeq as the gene model as implemented in OmicSoft ArraySuite software, version 8. RNA transcripts were quantified using RSEM methods as implemented in Arraystudio counting count the read fragments mapping to each individual gene and quantify expression by the corresponding FPKM. In summary, expression was measured as FPKM for 25,054 unique genes. Principal component analysis was then performed to check for possible batch effects and outliers complemented by calculating the RNA-Seq 5'->3' trend for each sample. One sample for the vehicle control as well as for the Liraglutide group were identified as outliers and removed from subsequent analysis, resulting in 7 and 8 samples remaining for each group respectively. Abundance values (counts) were normalized and compared between liraglutide treated mice versus baseline controls using DESeq2. All P-values were adjusted for multiple testing by the Benjamini-Hochberg method.

Project description:ContextNovel dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist (RA) tirzepatide demonstrated substantially greater glucose control and weight loss (WL) compared with selective GLP-1RA dulaglutide.ObjectiveExplore mechanisms of glucose control by tirzepatide.DesignPost hoc analyses of fasting biomarkers and multiple linear regression analysis.SettingForty-seven sites in 4 countries.Patients or other participantsThree hundred and sixteen subjects with type 2 diabetes.InterventionsTirzepatide (1, 5, 10, 15 mg), dulaglutide (1.5 mg), placebo.Main outcome measuresAnalyze biomarkers of beta-cell function and insulin resistance (IR) and evaluate WL contributions to IR improvements at 26 weeks.ResultsHomeostatic model assessment (HOMA) 2-B significantly increased with dulaglutide and tirzepatide 5, 10, and 15 mg compared with placebo (P ≤ .02). Proinsulin/insulin and proinsulin/C-peptide ratios significantly decreased with tirzepatide 10 and 15 mg compared with placebo and dulaglutide (P ≤ .007). Tirzepatide 10 and 15 mg significantly decreased fasting insulin (P ≤ .033) and tirzepatide 10 mg significantly decreased HOMA2-IR (P = .004) compared with placebo and dulaglutide. Markers of improved insulin sensitivity (IS) adiponectin, IGFBP-1, and IGFBP-2 significantly increased by 1 or more doses of tirzepatide (P < .05). To determine whether improvements in IR were directly attributable to WL, multiple linear regression analysis with potential confounding variables age, sex, metformin, triglycerides, and glycated hemoglobin A1c was conducted. WL significantly (P ≤ .028) explained only 13% and 21% of improvement in HOMA2-IR with tirzepatide 10 and 15 mg, respectively.ConclusionsTirzepatide improved markers of IS and beta-cell function to a greater extent than dulaglutide. IS effects of tirzepatide were only partly attributable to WL, suggesting dual receptor agonism confers distinct mechanisms of glycemic control.

Dataset Information

Agonist-induced membrane nanodomain clustering drives GLP-1 receptor responses in pancreatic beta cells.

Publications

Agonist-induced membrane nanodomain clustering drives GLP-1 receptor responses in pancreatic beta cells.

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