Title : Impaired glucose-stimulated insulin secretion, enhanced intraperitoneal insulin tolerance, and increased beta-cell mass in mice lacking the p110gamma isoform of phosphoinositide 3-kinase.

Pub. Date : 2004 Sep

PMID : 15231713






8 Functional Relationships(s)
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1 Impaired glucose-stimulated insulin secretion, enhanced intraperitoneal insulin tolerance, and increased beta-cell mass in mice lacking the p110gamma isoform of phosphoinositide 3-kinase. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
2 In 7- to 10-wk-old mice, knockout of p110gamma reduced the plasma insulin response to ip glucose injection and impaired first and second phase glucose-stimulated insulin secretion from pancreata perfused ex vivo. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
3 In 7- to 10-wk-old mice, knockout of p110gamma reduced the plasma insulin response to ip glucose injection and impaired first and second phase glucose-stimulated insulin secretion from pancreata perfused ex vivo. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
4 The p110gamma -/- mice responded to preinjection with the glucagon-like peptide-1 receptor agonist exendin 4, such that plasma glucose and insulin responses to ip glucose injection were not different from wild types. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
5 The p110gamma -/- mice responded to preinjection with the glucagon-like peptide-1 receptor agonist exendin 4, such that plasma glucose and insulin responses to ip glucose injection were not different from wild types. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
6 Mice lacking p110gamma were not diabetic and were only slightly glucose intolerant (ip glucose injection) compared with wild types, in part due to enhanced responsiveness to insulin as determined by an ip insulin tolerance test. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
7 Mice lacking p110gamma were not diabetic and were only slightly glucose intolerant (ip glucose injection) compared with wild types, in part due to enhanced responsiveness to insulin as determined by an ip insulin tolerance test. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus
8 These surprising results suggest that the G protein-coupled p110gamma isoform of PI3 kinase is not central to the development or maintenance of sufficient beta-cell mass but positively regulates glucose-stimulated insulin secretion. Glucose phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit gamma Mus musculus