ArticleApoptosis : an international journal on programmed cell death2017
Glucotoxicity promotes aberrant activation and mislocalization of Ras-related C3 botulinum toxin substrate 1 [Rac1] and metabolic dysfunction in pancreatic islet β-cells: reversal of such metabolic defects by metformin.
Article in Apoptosis : an international journal on programmed cell death, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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Who cites it
20 citing papers in PubMed, 27 citations in OpenAlex.
- Review
- The Diverse Roles of Mitochondria in Regulating Cancer Metastasis.Current issues in molecular biology · 2025Review
- Protein prenylation in islet β-cell function in health and metabolic stress.Biochemical pharmacology · 2025Review
- The RhoGDIβ-Rac1-CARD9 Signaling Module Mediates Islet β-Cell Dysfunction Under Chronic Hyperglycemia.Cells · 2025Review
- Regulatory roles of CARD9-BCL10-Rac1 (CBR) signalome in islet β-cell function in health and metabolic stress: Is there room for MALT1?Biochemical pharmacology · 2023Review
- Pharmacological inhibitors of β-cell dysfunction and death as therapeutics for diabetes.Frontiers in endocrinology · 2023Review
- Alpha4 contributes to the dysfunction of the pancreatic beta cell under metabolic stress.Molecular and cellular endocrinology · 2022Article
- Hyperglycemic Conditions Promote Rac1-Mediated Serine536 Phosphorylation of p65 Subunit of NFκB (RelA) in Pancreatic Beta Cells.Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2022Article
- Underappreciated roles for Rho GDP dissociation inhibitors (RhoGDIs) in cell function: Lessons learned from the pancreatic islet β-cell.Biochemical pharmacology · 2022Review
- Review
- Metformin inhibits MAPK signaling and rescues pancreatic aquaporin 7 expression to induce insulin secretion in type 2 diabetes mellitus.The Journal of biological chemistry · 2021Article
- Targeting Small GTPases and Their Prenylation in Diabetes Mellitus.Journal of medicinal chemistry · 2021Review
- Review
- RhoG-Rac1 Signaling Pathway Mediates Metabolic Dysfunction of the Pancreatic Beta-Cells Under Chronic Hyperglycemic Conditions.Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2021Article
- Potential roles of PP2A-Rac1 signaling axis in pancreatic β-cell dysfunction under metabolic stress: Progress and promise.Biochemical pharmacology · 2020Review
- GPCRs, G Proteins, and Their Impact on β-cell Function.Comprehensive Physiology · 2020Review
- Quantitative proteomics reveals novel interaction partners of Rac1 in pancreatic β-cells: Evidence for increased interaction with Rac1 under hyperglycemic conditions.Molecular and cellular endocrinology · 2019Article
- RACking up ceramide-induced islet β-cell dysfunction.Biochemical pharmacology · 2018Review
- Article
- Review
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Authors and funding
4 authors at 3 institutions in 1 country.
Funding
Abstract
Emerging evidence suggests that long-term exposure of insulin-secreting pancreatic β-cells to hyperglycemic (HG; glucotoxic) conditions promotes oxidative stress, which, in turn, leads to stress kinase activation, mitochondrial dysfunction, loss of nuclear structure and integrity and cell apoptosis. Original observations from our laboratory have proposed that Rac1 plays a key regulatory role in the generation of oxidative stress and downstream signaling events culminating in the onset of dysfunction of pancreatic β-cells under the duress of metabolic stress. However, precise molecular and cellular mechanisms underlying the metabolic roles of hyperactive Rac1 remain less understood. Using pharmacological and molecular biological approaches, we now report mistargetting of biologically-active Rac1 [GTP-bound conformation] to the nuclear compartment in clonal INS-1 cells, normal rat islets and human islets under HG conditions. Our findings also suggest that such a signaling step is independent of post-translational prenylation of Rac1. Evidence is also presented to highlight novel roles for sustained activation of Rac1 in HG-induced expression of Cluster of Differentiation 36 [CD36], a fatty acid transporter protein, which is implicated in cell apoptosis. Finally, our findings suggest that metformin, a biguanide anti-diabetic drug, at a clinically relevant concentration, prevents β-cell defects [Rac1 activation, nuclear association, CD36 expression, stress kinase and caspase-3 activation, and loss in metabolic viability] under the duress of glucotoxicity. Potential implications of these findings in the context of novel and direct regulation of islet β-cell function by metformin are discussed.
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Registered trials
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