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GLP-1 inhibits and ...
GLP-1 inhibits and adrenaline stimulates glucagon release by differential modulation of N- and L-type Ca2+ channel-dependent exocytosis.
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- De Marinis, Yang (author)
- Lund University,Lunds universitet,Diabetes - öcellsexocytos,Forskargrupper vid Lunds universitet,Diabetes - Islet Cell Exocytosis,Lund University Research Groups
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- Salehi, S Albert (author)
- Lund University,Lunds universitet,Islet cell physiology,Forskargrupper vid Lunds universitet,Lund University Research Groups
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Ward, Caroline E (author)
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- Zhang, Quan (author)
- Lund University,Lunds universitet,Islet cell physiology,Forskargrupper vid Lunds universitet,Lund University Research Groups
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Abdulkader, Fernando (author)
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Bengtsson, Martin (author)
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Braha, Orit (author)
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Braun, Matthias (author)
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Ramracheya, Reshma (author)
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- Amisten, Stefan (author)
- Lund University,Lunds universitet,Islet cell physiology,Forskargrupper vid Lunds universitet,Lund University Research Groups
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Habib, Abdella M (author)
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Moritoh, Yusuke (author)
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- Zhang, Enming (author)
- Lund University,Lunds universitet,Diabetes - öpatofysiologi,Forskargrupper vid Lunds universitet,Diabetes - Islet Patophysiology,Lund University Research Groups
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Reimann, Frank (author)
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- Rosengren, Anders (author)
- Lund University,Lunds universitet,Diabetes - öpatofysiologi,Forskargrupper vid Lunds universitet,Diabetes - Islet Patophysiology,Lund University Research Groups
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Shibasaki, Tadao (author)
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Gribble, Fiona (author)
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- Renström, Erik (author)
- Lund University,Lunds universitet,Diabetes - öpatofysiologi,Forskargrupper vid Lunds universitet,Diabetes - Islet Patophysiology,Lund University Research Groups
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Seino, Susumu (author)
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- Eliasson, Lena (author)
- Lund University,Lunds universitet,Diabetes - öcellsexocytos,Forskargrupper vid Lunds universitet,Diabetes - Islet Cell Exocytosis,Lund University Research Groups
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Rorsman, Patrik (author)
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- English.
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In: Cell Metabolism. - : Elsevier BV. - 1550-4131. ; 11:6, s. 543-553
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https://doi.org/10.1...
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Abstract
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- Glucagon secretion is inhibited by glucagon-like peptide-1 (GLP-1) and stimulated by adrenaline. These opposing effects on glucagon secretion are mimicked by low (1-10 nM) and high (10 muM) concentrations of forskolin, respectively. The expression of GLP-1 receptors in alpha cells is <0.2% of that in beta cells. The GLP-1-induced suppression of glucagon secretion is PKA dependent, is glucose independent, and does not involve paracrine effects mediated by insulin or somatostatin. GLP-1 is without much effect on alpha cell electrical activity but selectively inhibits N-type Ca(2+) channels and exocytosis. Adrenaline stimulates alpha cell electrical activity, increases [Ca(2+)](i), enhances L-type Ca(2+) channel activity, and accelerates exocytosis. The stimulatory effect is partially PKA independent and reduced in Epac2-deficient islets. We propose that GLP-1 inhibits glucagon secretion by PKA-dependent inhibition of the N-type Ca(2+) channels via a small increase in intracellular cAMP ([cAMP](i)). Adrenaline stimulates L-type Ca(2+) channel-dependent exocytosis by activation of the low-affinity cAMP sensor Epac2 via a large increase in [cAMP](i).
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Cell- och molekylärbiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Cell and Molecular Biology (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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De Marinis, Yang
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Salehi, S Albert
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Ward, Caroline E
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Zhang, Quan
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Abdulkader, Fern ...
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Bengtsson, Marti ...
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show more...
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Braha, Orit
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Braun, Matthias
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Ramracheya, Resh ...
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Amisten, Stefan
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Habib, Abdella M
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Moritoh, Yusuke
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Zhang, Enming
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Reimann, Frank
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Rosengren, Ander ...
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Shibasaki, Tadao
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Gribble, Fiona
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Renström, Erik
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Seino, Susumu
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Eliasson, Lena
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Rorsman, Patrik
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- About the subject
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Basic Medicine
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and Cell and Molecul ...
- Articles in the publication
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Cell Metabolism
- By the university
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Lund University