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Glucose intolerance...
Glucose intolerance and reduced islet blood flow in transgenic mice expressing the FRK tyrosine kinase under the control of the rat insulin promoter
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- Annerén, Cecilia (författare)
- Uppsala universitet,Institutionen för medicinsk cellbiologi
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- Welsh, Michael (författare)
- Uppsala universitet,Institutionen för medicinsk cellbiologi
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- Jansson, Leif (författare)
- Uppsala universitet,Institutionen för medicinsk cellbiologi
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(creator_code:org_t)
- American Physiological Society, 2007
- 2007
- Engelska.
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Ingår i: American Journal of Physiology. Endocrinology and Metabolism. - : American Physiological Society. - 0193-1849 .- 1522-1555. ; 292:4, s. E1183-E1190
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The FRK tyrosine kinase has previously been shown to transduce β-cell cytotoxic signals in response to cytokines and streptozotocin and to promote β-cell proliferation and an increased β-cell mass. We therefore aimed to further evaluate the effects of overexpression of FRK tyrosine kinase in β-cells. A transgenic mouse expressing kinase-active FRK under control of the insulin promoter (RIP-FRK) was studied with regard to islet endocrine function and vascular morphology. Mild glucose intolerance develops in RIP-FRK male mice of at least 4 mo of age. This effect is accompanied by reduced glucose-stimulated insulin secretion in vivo and reduced second-phase insulin secretion in response to glucose and arginine upon pancreas perfusion. Islets isolated from the FRK transgenic mice display a glucose-induced insulin secretory response in vitro similar to that of control islets. However, islet blood flow per islet volume is decreased in the FRK transgenic mice. These mice also exhibit a reduced islet capillary lumen diameter as shown by electron microscopy. Total body weight and pancreas weight are not significantly affected, but the β-cell mass is increased. The data suggest that long-term expression of active FRK in β-cells causes an in vivo insulin-secretory defect, which may be the consequence of islet vascular abnormalities that yield a decreased islet blood flow.
Nyckelord
- β-cells
- Insulin secretion
- MEDICINE
- MEDICIN
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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