Differential expression of rat pancreatic islet beta-cell glucose transporter (GLUT 2), proinsulin and islet amyloid polypeptide genes after prolonged fasting, insulin-induced hypoglycaemia and dexamethasone treatment
The question posed by these studies was whether chronic adaptive changes in glucose-stimulated insulin secretion are accompanied by comparable changes in islet Beta-cell glucose transporter (GLUT 2) gene expression. Control, fasted (3-day), insulin-injected hypoglycaemic (5-day), and dexamethasone-treated (4-day) rats (n = 5 for each condition), were studied. After fasting significant decrements in proinsulin mRNA/microgram RNA (-32%, p < 0.05) and islet amyloid polypeptide mRNA/microgram RNA (-44%, p < 0.05) were observed, while there was no change in GLUT 2 mRNA/microgram RNA (-13%, p > 0.05). After insulin-induced hypoglycaemia, decrements in proinsulin mRNA/microgram RNA (-49%, p < 0.01) and islet amyloid polypeptide mRNA/microgram RNA (-44%, p < 0.01) were also observed, with no change in islet GLUT 2 mRNA/microgram RNA (-18%, p > 0.05). Dexamethasone treatment resulted in a marked stimulatory effect on proinsulin mRNA/microgram RNA (+236%, p < 0.001) and islet amyloid polypeptide mRNA/microgram RNA (+221%, p < 0.01), while again there was no change in islet GLUT 2 mRNA/microgram RNA (+0.3%, p > 0.05). Quantitative immunoblot analysis with a GLUT 2 specific antibody revealed no change in islet GLUT 2 protein with fasting, but a small decrease (-39 +/- 11%) in islet GLUT 2/microgram protein after insulin-induced hypoglycaemia. These results do not support the hypothesis that chronic changes in glucose-stimulated insulin secretion are accompanied by changes in GLUT 2 expression. In contrast to the lack of correlation with GLUT 2, there was a striking correlation between proinsulin and islet amyloid polypeptide mRNAs for all experimental conditions (r = 0.974, p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS).
Medienart: |
Artikel |
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Erscheinungsjahr: |
1992 |
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Erschienen: |
1992 |
Enthalten in: |
Zur Gesamtaufnahme - volume:35 |
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Enthalten in: |
Diabetologia - 35(1992), 12 vom: 01. Dez., Seite 1125-32 |
Sprache: |
Englisch |
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Beteiligte Personen: |
Koranyi, L [VerfasserIn] |
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Anmerkungen: |
Date Completed 05.02.1993 Date Revised 16.08.2019 published: Print Citation Status MEDLINE |
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Förderinstitution / Projekttitel: |
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PPN (Katalog-ID): |
NLM012628727 |
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100 | 1 | |a Koranyi, L |e verfasserin |4 aut | |
245 | 1 | 0 | |a Differential expression of rat pancreatic islet beta-cell glucose transporter (GLUT 2), proinsulin and islet amyloid polypeptide genes after prolonged fasting, insulin-induced hypoglycaemia and dexamethasone treatment |
264 | 1 | |c 1992 | |
336 | |a Text |b txt |2 rdacontent | ||
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500 | |a Date Revised 16.08.2019 | ||
500 | |a published: Print | ||
500 | |a Citation Status MEDLINE | ||
520 | |a The question posed by these studies was whether chronic adaptive changes in glucose-stimulated insulin secretion are accompanied by comparable changes in islet Beta-cell glucose transporter (GLUT 2) gene expression. Control, fasted (3-day), insulin-injected hypoglycaemic (5-day), and dexamethasone-treated (4-day) rats (n = 5 for each condition), were studied. After fasting significant decrements in proinsulin mRNA/microgram RNA (-32%, p < 0.05) and islet amyloid polypeptide mRNA/microgram RNA (-44%, p < 0.05) were observed, while there was no change in GLUT 2 mRNA/microgram RNA (-13%, p > 0.05). After insulin-induced hypoglycaemia, decrements in proinsulin mRNA/microgram RNA (-49%, p < 0.01) and islet amyloid polypeptide mRNA/microgram RNA (-44%, p < 0.01) were also observed, with no change in islet GLUT 2 mRNA/microgram RNA (-18%, p > 0.05). Dexamethasone treatment resulted in a marked stimulatory effect on proinsulin mRNA/microgram RNA (+236%, p < 0.001) and islet amyloid polypeptide mRNA/microgram RNA (+221%, p < 0.01), while again there was no change in islet GLUT 2 mRNA/microgram RNA (+0.3%, p > 0.05). Quantitative immunoblot analysis with a GLUT 2 specific antibody revealed no change in islet GLUT 2 protein with fasting, but a small decrease (-39 +/- 11%) in islet GLUT 2/microgram protein after insulin-induced hypoglycaemia. These results do not support the hypothesis that chronic changes in glucose-stimulated insulin secretion are accompanied by changes in GLUT 2 expression. In contrast to the lack of correlation with GLUT 2, there was a striking correlation between proinsulin and islet amyloid polypeptide mRNAs for all experimental conditions (r = 0.974, p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS) | ||
650 | 4 | |a Journal Article | |
650 | 4 | |a Research Support, Non-U.S. Gov't | |
650 | 4 | |a Research Support, U.S. Gov't, P.H.S. | |
650 | 7 | |a Amyloid |2 NLM | |
650 | 7 | |a Blood Glucose |2 NLM | |
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700 | 1 | |a Bourey, R |e verfasserin |4 aut | |
700 | 1 | |a Turk, J |e verfasserin |4 aut | |
700 | 1 | |a Mueckler, M |e verfasserin |4 aut | |
700 | 1 | |a Permutt, M A |e verfasserin |4 aut | |
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