Glucose-Stimulated Insulin Secretion Fundamentally Requires H(2)O(2)Signaling by NADPH Oxidase 4
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985823%3A_____%2F20%3A00531109" target="_blank" >RIV/67985823:_____/20:00531109 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/00023001:_____/20:00079785
Výsledek na webu
<a href="https://doi.org/10.2337/db19-1130" target="_blank" >https://doi.org/10.2337/db19-1130</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2337/db19-1130" target="_blank" >10.2337/db19-1130</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Glucose-Stimulated Insulin Secretion Fundamentally Requires H(2)O(2)Signaling by NADPH Oxidase 4
Popis výsledku v původním jazyce
NADPH facilitates glucose-stimulated insulin secretion (GSIS) in pancreatic islets (PIs) of beta-cells through an as yet unknown mechanism. We found NADPH oxidase isoform 4 (NOX4) to be the main producer of cytosolic H2O2, which is essential for GSIS, an increase in ATP alone was insufficient for GSIS. The fast GSIS phase was absent from PIs from NOX4-null, beta-cell-specific knockout mice (NOX4 beta KO) (though not from NOX2 knockout mice) and from NOX4-silenced or catalase-overexpressing INS-1E cells. Lentiviral NOX4 overexpression or H(2)O(2)rescued GSIS in PIs from NOX4 beta KO mice. NOX4 silencing suppressed Ca(2+)oscillations, and the patch-clamped K(ATP)channel opened more frequently when glucose was high. Mitochondrial H2O2, decreasing upon GSIS, provided alternative redox signaling when 2-oxo-isocaproate or fatty acid oxidation formed superoxides through electron-transfer flavoprotein:Q-oxidoreductase. Unlike GSIS, such insulin secretion was blocked with mitochondrial antioxidant SkQ1. Both NOX4 knockout and NOX4 beta KO mice exhibited impaired glucose tolerance and peripheral insulin resistance. Thus, the redox signaling previously suggested to cause beta-cells to self-check hypothetically induces insulin resistance when it is absent. In conclusion, increases in ATP and H(2)O(2)constitute an essential signal that switches on insulin exocytosis for glucose and branched-chain oxoacids as secretagogues (it does so partially for fatty acids). Redox signaling could be impaired by cytosolic antioxidants, hence, those targeting mitochondria should be preferred for clinical applications to treat (pre)diabetes at any stage.
Název v anglickém jazyce
Glucose-Stimulated Insulin Secretion Fundamentally Requires H(2)O(2)Signaling by NADPH Oxidase 4
Popis výsledku anglicky
NADPH facilitates glucose-stimulated insulin secretion (GSIS) in pancreatic islets (PIs) of beta-cells through an as yet unknown mechanism. We found NADPH oxidase isoform 4 (NOX4) to be the main producer of cytosolic H2O2, which is essential for GSIS, an increase in ATP alone was insufficient for GSIS. The fast GSIS phase was absent from PIs from NOX4-null, beta-cell-specific knockout mice (NOX4 beta KO) (though not from NOX2 knockout mice) and from NOX4-silenced or catalase-overexpressing INS-1E cells. Lentiviral NOX4 overexpression or H(2)O(2)rescued GSIS in PIs from NOX4 beta KO mice. NOX4 silencing suppressed Ca(2+)oscillations, and the patch-clamped K(ATP)channel opened more frequently when glucose was high. Mitochondrial H2O2, decreasing upon GSIS, provided alternative redox signaling when 2-oxo-isocaproate or fatty acid oxidation formed superoxides through electron-transfer flavoprotein:Q-oxidoreductase. Unlike GSIS, such insulin secretion was blocked with mitochondrial antioxidant SkQ1. Both NOX4 knockout and NOX4 beta KO mice exhibited impaired glucose tolerance and peripheral insulin resistance. Thus, the redox signaling previously suggested to cause beta-cells to self-check hypothetically induces insulin resistance when it is absent. In conclusion, increases in ATP and H(2)O(2)constitute an essential signal that switches on insulin exocytosis for glucose and branched-chain oxoacids as secretagogues (it does so partially for fatty acids). Redox signaling could be impaired by cytosolic antioxidants, hence, those targeting mitochondria should be preferred for clinical applications to treat (pre)diabetes at any stage.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
30202 - Endocrinology and metabolism (including diabetes, hormones)
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Diabetes
ISSN
0012-1797
e-ISSN
—
Svazek periodika
69
Číslo periodika v rámci svazku
7
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
14
Strana od-do
1341-1354
Kód UT WoS článku
000542843100006
EID výsledku v databázi Scopus
2-s2.0-85086740400