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C16:0 sulfatide inh...
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Buschard, Karsten
(författare)
C16:0 sulfatide inhibits insulin secretion in rat beta-cells by reducing the sensitivity of KATP channels to ATP inhibition
- Artikel/kapitelEngelska2006
Förlag, utgivningsår, omfång ...
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American Diabetes Association,2006
Nummerbeteckningar
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LIBRIS-ID:oai:gup.ub.gu.se/36331
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https://gup.ub.gu.se/publication/36331URI
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https://doi.org/10.2337/db05-1355DOI
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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Sulfatide (3'-sulfo-beta-galactosyl ceramide) is a glycosphingolipid present in mammalians in various fatty acid isoforms of which the saturated 16 carbon-atom length (C16:0) is more abundant in pancreatic islets than in neural tissue, where long-chain sulfatide isoforms dominate. We previously reported that sulfatide isolated from pig brain inhibits glucose-induced insulin secretion by activation of ATP-sensitive K+ channels (K(ATP) channels). Here, we show that C16:0 sulfatide is the active isoform. It inhibits glucose-stimulated insulin secretion by reducing the sensitivity of the K(ATP) channels to ATP. (The half-maximal inhibitory concentration is 10.3 and 36.7 micromol/l in the absence and presence of C16:0 sulfatide, respectively.) C16:0 sulfatide increased whole-cell K(ATP) currents at intermediate glucose levels and reduced the ability of glucose to induce membrane depolarization, reduced electrical activity, and increased the cytoplasmic free Ca2+ concentration. Recordings of cell capacitance revealed that C16:0 sulfatide increased Ca2+-induced exocytosis by 215%. This correlated with a stimulation of insulin secretion by C16:0 sulfatide in intact rat islets exposed to diazoxide and high K+. C24:0 sulfatide or the sulfatide precursor, beta-galactosyl ceramide, did not affect any of the measured parameters. C16:0 sulfatide did not modulate glucagon secretion from intact rat islets. In betaTC3 cells, sulfatide was expressed (mean [+/-SD] 0.30 +/- 0.04 pmol/microg protein), and C16:0 sulfatide was found to be the dominant isoform. No expression of sulfatide was detected in alphaTC1-9 cells. We conclude that a major mechanism by which the predominant sulfatide isoform in beta-cells, C16:0 sulfatide, inhibits glucose-induced insulin secretion is by reducing the K(ATP) channel sensitivity to the ATP block.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Blomqvist, Maria K.,1975Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xbmarq
(författare)
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Månsson, Jan-Eric,1946Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xmanja
(författare)
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Fredman, Pam,1950Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xfredp
(författare)
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Juhl, Kirstine
(författare)
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Gromada, Jesper
(författare)
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Göteborgs universitetInstitutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Diabetes: American Diabetes Association55:10, s. 2826-340012-17971939-327X
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