β Cell tone is defined by proglucagon peptides through cAMP signaling

Paracrine interactions between pancreatic islet cells have been proposed as a mechanism to regulate hormone secretion and glucose homeostasis. Here, we demonstrate the importance of proglucagon-derived peptides (PGDPs) for α to β cell communication and control of insulin secretion. Signaling through...

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Published inJCI insight Vol. 4; no. 5
Main Authors Capozzi, Megan E, Svendsen, Berit, Encisco, Sara E, Lewandowski, Sophie L, Martin, Mackenzie D, Lin, Haopeng, Jaffe, Justin L, Coch, Reilly W, Haldeman, Jonathan M, MacDonald, Patrick E, Merrins, Matthew J, D'Alessio, David A, Campbell, Jonathan E
Format Journal Article
LanguageEnglish
Published United States American Society for Clinical Investigation 07.03.2019
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Abstract Paracrine interactions between pancreatic islet cells have been proposed as a mechanism to regulate hormone secretion and glucose homeostasis. Here, we demonstrate the importance of proglucagon-derived peptides (PGDPs) for α to β cell communication and control of insulin secretion. Signaling through this system occurs through both the glucagon-like peptide receptor (Glp1r) and glucagon receptor (Gcgr). Loss of PGDPs, or blockade of their receptors, decreases insulin secretion in response to both metabolic and nonmetabolic stimulation of mouse and human islets. This effect is due to reduced β cell cAMP and affects the quantity but not dynamics of insulin release, indicating that PGDPs dictate the magnitude of insulin output in an isolated islet. In healthy mice, additional factors that stimulate cAMP can compensate for loss of PGDP signaling; however, input from α cells is essential to maintain glucose tolerance during the metabolic stress induced by high-fat feeding. These findings demonstrate an essential role for α cell regulation of β cells, raising the possibility that abnormal paracrine signaling contributes to impaired insulin secretion in diabetes. Moreover, these findings support reconsideration of the role for α cells in postprandial glucose control.
AbstractList Paracrine interactions between pancreatic islet cells have been proposed as a mechanism to regulate hormone secretion and glucose homeostasis. Here, we demonstrate the importance of proglucagon-derived peptides (PGDPs) for α to β cell communication and control of insulin secretion. Signaling through this system occurs through both the glucagon-like peptide receptor (Glp1r) and glucagon receptor (Gcgr). Loss of PGDPs, or blockade of their receptors, decreases insulin secretion in response to both metabolic and nonmetabolic stimulation of mouse and human islets. This effect is due to reduced β cell cAMP and affects the quantity but not dynamics of insulin release, indicating that PGDPs dictate the magnitude of insulin output in an isolated islet. In healthy mice, additional factors that stimulate cAMP can compensate for loss of PGDP signaling; however, input from α cells is essential to maintain glucose tolerance during the metabolic stress induced by high-fat feeding. These findings demonstrate an essential role for α cell regulation of β cells, raising the possibility that abnormal paracrine signaling contributes to impaired insulin secretion in diabetes. Moreover, these findings support reconsideration of the role for α cells in postprandial glucose control. Proglucagon derived peptides from α-cells are essential to determine the tone of insulin secretion in β-cells.
Paracrine interactions between pancreatic islet cells have been proposed as a mechanism to regulate hormone secretion and glucose homeostasis. Here, we demonstrate the importance of proglucagon-derived peptides (PGDPs) for α to β cell communication and control of insulin secretion. Signaling through this system occurs through both the glucagon-like peptide receptor (Glp1r) and glucagon receptor (Gcgr). Loss of PGDPs, or blockade of their receptors, decreases insulin secretion in response to both metabolic and nonmetabolic stimulation of mouse and human islets. This effect is due to reduced β cell cAMP and affects the quantity but not dynamics of insulin release, indicating that PGDPs dictate the magnitude of insulin output in an isolated islet. In healthy mice, additional factors that stimulate cAMP can compensate for loss of PGDP signaling; however, input from α cells is essential to maintain glucose tolerance during the metabolic stress induced by high-fat feeding. These findings demonstrate an essential role for α cell regulation of β cells, raising the possibility that abnormal paracrine signaling contributes to impaired insulin secretion in diabetes. Moreover, these findings support reconsideration of the role for α cells in postprandial glucose control.
Author Campbell, Jonathan E
Jaffe, Justin L
Lewandowski, Sophie L
Haldeman, Jonathan M
Lin, Haopeng
Capozzi, Megan E
MacDonald, Patrick E
Martin, Mackenzie D
Coch, Reilly W
D'Alessio, David A
Merrins, Matthew J
Encisco, Sara E
Svendsen, Berit
AuthorAffiliation 5 Department of Pharmacology and Cancer Biology, Duke University, Durham, North Carolina, USA
2 Department of Medicine, Division of Endocrinology, Diabetes & Metabolism, University of Wisconsin–Madison, Madison, Wisconsin, USA
1 Duke Molecular Physiology Institute, Duke University, Durham, North Carolina, USA
3 Department of Pharmacology and Alberta Diabetes Institute, University of Alberta, Alberta, Canada
4 Department of Medicine and
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Snippet Paracrine interactions between pancreatic islet cells have been proposed as a mechanism to regulate hormone secretion and glucose homeostasis. Here, we...
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SourceType Open Access Repository
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Title β Cell tone is defined by proglucagon peptides through cAMP signaling
URI https://www.ncbi.nlm.nih.gov/pubmed/30720465
https://search.proquest.com/docview/2179536527
https://pubmed.ncbi.nlm.nih.gov/PMC6483521
Volume 4
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