pubmed-article:19171650 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0401925 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0030274 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0017687 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0015283 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0596235 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0205263 | lld:lifeskim |
pubmed-article:19171650 | lifeskim:mentions | umls-concept:C0183210 | lld:lifeskim |
pubmed-article:19171650 | pubmed:issue | Pt 6 | lld:pubmed |
pubmed-article:19171650 | pubmed:dateCreated | 2009-3-16 | lld:pubmed |
pubmed-article:19171650 | pubmed:abstractText | Hormones such as glucagon are secreted by Ca(2+)-induced exocytosis of large dense-core vesicles, but the mechanisms involved have only been partially elucidated. Studies of pancreatic beta-cells secreting insulin revealed that synaptotagmin-7 alone is not sufficient to mediate Ca(2+)-dependent insulin granule exocytosis, and studies of chromaffin cells secreting neuropeptides and catecholamines showed that synaptotagmin-1 and -7 collaborate as Ca(2+) sensors for exocytosis, and that both are equally involved. As no other peptide secretion was analysed, it remains unclear whether synaptotagmins generally act as Ca(2+) sensors in large dense-core vesicle exocytosis in endocrine cells, and if so, whether synaptotagmin-7 always functions with a partner in that role. In particular, far less is known about the mechanisms underlying Ca(2+)-triggered glucagon release from alpha-cells than insulin secretion from beta-cells, even though insulin and glucagon together regulate blood glucose levels. To address these issues, we analysed the role of synaptotagmins in Ca(2+)-triggered glucagon exocytosis. Surprisingly, we find that deletion of a single synaptotagmin isoform, synaptotagmin-7, nearly abolished Ca(2+)-triggered glucagon secretion. Moreover, single-cell capacitance measurements confirmed that pancreatic alpha-cells lacking synaptotagmin-7 exhibited little Ca(2+)-induced exocytosis, whereas all other physiological and morphological parameters of the alpha-cells were normal. Our data thus identify synaptotagmin-7 as a principal Ca(2+) sensor for glucagon secretion, and support the notion that synaptotagmins perform a universal but selective function as individually acting Ca(2+) sensors in neurotransmitter, neuropeptide, and hormone secretion. | lld:pubmed |
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pubmed-article:19171650 | pubmed:language | eng | lld:pubmed |
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pubmed-article:19171650 | pubmed:citationSubset | IM | lld:pubmed |
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pubmed-article:19171650 | pubmed:status | MEDLINE | lld:pubmed |
pubmed-article:19171650 | pubmed:month | Mar | lld:pubmed |
pubmed-article:19171650 | pubmed:issn | 1469-7793 | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:JaxWW | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:SüdhofThomas... | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:RorsmanPatrik... | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:HanWeipingW | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:WeiShun-HuiSH | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:ZhangQuanQ | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:RaddaGeorge... | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:GustavssonNat... | lld:pubmed |
pubmed-article:19171650 | pubmed:author | pubmed-author:HoangDong... | lld:pubmed |
pubmed-article:19171650 | pubmed:issnType | Electronic | lld:pubmed |
pubmed-article:19171650 | pubmed:day | 15 | lld:pubmed |
pubmed-article:19171650 | pubmed:volume | 587 | lld:pubmed |
pubmed-article:19171650 | pubmed:owner | NLM | lld:pubmed |
pubmed-article:19171650 | pubmed:authorsComplete | Y | lld:pubmed |
pubmed-article:19171650 | pubmed:pagination | 1169-78 | lld:pubmed |
pubmed-article:19171650 | pubmed:dateRevised | 2011-11-17 | lld:pubmed |
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pubmed-article:19171650 | pubmed:year | 2009 | lld:pubmed |
pubmed-article:19171650 | pubmed:articleTitle | Synaptotagmin-7 is a principal Ca2+ sensor for Ca2+ -induced glucagon exocytosis in pancreas. | lld:pubmed |
pubmed-article:19171650 | pubmed:affiliation | Laboratory of Metabolic Medicine, Singapore Bioimaging Consortium, A*STAR, Singapore 138667. | lld:pubmed |
pubmed-article:19171650 | pubmed:publicationType | Journal Article | lld:pubmed |
pubmed-article:19171650 | pubmed:publicationType | Research Support, Non-U.S. Gov't | lld:pubmed |
entrez-gene:54525 | entrezgene:pubmed | pubmed-article:19171650 | lld:entrezgene |
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