WFRF:(Fan Zhang)
Sökning: WFRF:(Fan Zhang) > (2005-2009) > Involvement of JAK2...
Involvement of JAK2 and Src kinase tyrosine phosphorylation in human growth hormone-stimulated increases in cytosolic free Ca2+ and insulin secretion
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- Zhang, Fan (författare)
- Karolinska Institutet
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- Zhang, Qimin (författare)
- Karolinska Institutet
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- Tengholm, Anders (författare)
- Uppsala universitet,Institutionen för medicinsk cellbiologi,Uppsala universitet, Institutionen för medicinsk cellbiologi
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- American Physiological Society, 2006
- 2006
- Engelska.
- Ingår i: American Journal of Physiology - Cell Physiology. - : American Physiological Society. - 0363-6143 .- 1522-1563. ; 291:3, s. C466-C475
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- We previously reported that human growth hormone (hGH) increases cytoplasmic Ca2+ concentration ([Ca2+](i)) and proliferation in pancreatic beta-cells (Sjoholm A, Zhang Q, Welsh N, Hansson A, Larsson O, Tally M, and Berggren PO. J Biol Chem 275: 21033-21040, 2000) and that the hGH-induced rise in [Ca2+](i) involves Ca2+-induced Ca2+ release facilitated by tyrosine phosphorylation of ryanodine receptors (Zhang Q, Kohler M, Yang SN, Zhang F, Larsson O, and Berggren PO. Mol Endocrinol 18: 1658-1669, 2004). Here we investigated the tyrosine kinases that convey the hGH-induced rise in [Ca2+](i) and insulin release in BRIN-BD11 beta-cells. hGH caused tyrosine phosphorylation of Janus kinase (JAK)2 and c-Src, events inhibited by the JAK2 inhibitor AG490 or the Src kinase inhibitor PP2. Although hGH-stimulated rises in [Ca2+](i) and insulin secretion were completely abolished by AG490 and JAK2 inhibitor II, the inhibitors had no effect on insulin secretion stimulated by a high K+ concentration. Similarly, Src kinase inhibitor-1 and PP2, but not its inactive analog PP3, suppressed [Ca2+](i) elevation and completely abolished insulin secretion stimulated by hGH but did not affect responses to K+. Ovine prolactin increased [Ca2+](i) and insulin secretion to a similar extent as hGH, effects prevented by the JAK2 and Src kinase inhibitors. In contrast, bovine GH evoked a rise in [Ca2+](i) but did not stimulate insulin secretion. Neither JAK2 nor Src kinase inhibitors influenced the effect of bovine GH on [Ca2+](i). Our study indicates that hGH stimulates rise in [Ca2+](i) and insulin secretion mainly through activation of the prolactin receptor and JAK2 and Src kinases in rat insulin-secreting cells.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine (hsv//eng)
Nyckelord
- c-Src
- growth hormone receptor
- prolactin receptor
- Ca2+-induced
- Ca2+ release
- MEDICINE
- MEDICIN
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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- Zhang, Fan
- Zhang, Qimin
- Tengholm, Anders
- Sjöholm, Åke
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- Karolinska Institutet
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