ArticleThe Journal of physiology2001
Somatostatin inhibits exocytosis in rat pancreatic alpha-cells by G(i2)-dependent activation of calcineurin and depriming of secretory granules.
Article in The Journal of physiology, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 51 papers.
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Who cites it
51 citing papers in PubMed, 122 citations in OpenAlex.
- Stathmin-2 mediates paracrine hormone regulation of glucagon through lysosomal trafficking in αTC1-6 cells.The Journal of physiology · 2026Article
- Pancreatic α-cells are functionally heterogeneous and sex-dependently regulated by neighboring endocrine cells.Communications biology · 2026Article
- Antecedent hypoglycaemia impairs glucagon secretion by enhancing somatostatin-mediated negative feedback control.Nature metabolism · 2026Article
- Role of complexin 2 in the regulation of hormone secretion from the islet of Langerhans.American journal of physiology. Endocrinology and metabolism · 2025Article
- Somatostatin modulation of initial fusion pores in CaThe Journal of physiology · 2025Article
- Real-time detection of somatostatin release from single islets reveals hypersecretion in type 2 diabetes.Acta physiologica (Oxford, England) · 2025Article
- Loss of electrical β-cell to δ-cell coupling underlies impaired hypoglycaemia-induced glucagon secretion in type-1 diabetes.Nature metabolism · 2024Article
- Adropin Is Expressed in Pancreatic Islet Cells and Reduces Glucagon Release in Diabetes Mellitus.International journal of molecular sciences · 2024Article
- Agonists, Antagonists and Receptors of Somatostatin: Pathophysiological and Therapeutical Implications in Neoplasias.Current issues in molecular biology · 2024Review
- The Importance of Intra-Islet Communication in the Function and Plasticity of the Islets of Langerhans during Health and Diabetes.International journal of molecular sciences · 2024Review
- Metabolic regulation of glucagon secretion.The Journal of endocrinology · 2023Article
- α-cell electrophysiology and the regulation of glucagon secretion.The Journal of endocrinology · 2023Review
- Metabolic Messengers: glucagon.Nature metabolism · 2023Review
- Glucose inhibits glucagon secretion by decreasing [CaMolecular metabolism · 2022Article
- Review
- Intercellular Communication in the Islet of Langerhans in Health and Disease.Comprehensive Physiology · 2021Article
- δ-Cells: The Neighborhood Watch in the Islet Community.Biology · 2021Review
- Pathways of Glucagon Secretion and Trafficking in the Pancreatic Alpha Cell: Novel Pathways, Proteins, and Targets for Hyperglucagonemia.Frontiers in endocrinology · 2021Review
- Paracrine control of α-cell glucagon exocytosis is compromised in human type-2 diabetes.Nature communications · 2020Article
- Development and Characteristics of Pancreatic Epsilon Cells.International journal of molecular sciences · 2019Review
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
1. Measurements of cell capacitance were used to investigate the molecular mechanisms by which somatostatin inhibits Ca(2+)-induced exocytosis in single rat glucagon-secreting pancreatic alpha-cells. 2. Somatostatin decreased the exocytotic responses elicited by voltage-clamp depolarisations by 80 % in the presence of cyclic AMP-elevating agents such as isoprenaline and forskolin. Inhibition was time dependent and half-maximal within 22 s. 3. The inhibitory action of somatostatin was concentration dependent with an IC(50) of 68 nM and prevented by pretreatment of the cells with pertussis toxin. The latter effect was mimicked by intracellular dialysis with specific antibodies to G(i1/2) and by antisense oligonucleotides against G proteins of the subtype G(i2). 4. Somatostatin lacked inhibitory action when applied in the absence of forskolin or in the presence of the L-type Ca(2+) channel blocker nifedipine. The size of the omega-conotoxin-sensitive and forskolin-independent component of exocytosis was limited to 60 fF. By contrast, somatostatin abolished L-type Ca(2+) channel-dependent exocytosis in alpha-cells exposed to forskolin. The magnitude of the latter pool amounted to 230 fF. 5. The inhibitory effect of somatostatin on exocytosis was mediated by activation of the serine/threonine protein phosphatase calcineurin and was prevented by pretreatment with cyclosporin A and deltamethrin or intracellularly applied calcineurin autoinhibitory peptide. Experiments using the stable ATP analogue AMP-PCP indicate that somatostatin acts by depriming of granules. 6. We propose that somatostatin receptors associate with L-type Ca(2+) channels and couple to G(i2) proteins leading to a localised activation of calcineurin and depriming of secretory granules situated close to the L-type Ca(2+) channels.
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