3 research outputs found
InsulinoopornoÅÄ poprzedza nietolerancjÄ glukozy i hiperleptynemiÄ u myszy C57BL/6J otrzymujÄ cych karmÄ wysokotÅuszczowÄ i zawierajÄ cÄ cukry proste
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Introduction: Very few systematic studies are done during the onset and progression of metabolic syndrome in suitable animal models. In this paper we present the effect of High-Fat Simple Carbohydrate (HFSC) feed on the metabolic hormones in C57BL/6J mice to understand the sequence of events leading to impairment of glucose homeostasis.
Material and methods: One-month-old male C57BL/6J mice were fed with control (C group) and HFSC (T group) feed (n = 30 each) respectively for five months. The glucose tolerance was studied by Oral Glucose Tolerance Test (OGTT) whereas serum insulin and leptin were quantified using ELISA kits, and serum cortisol was quantified using CLIA kits.
Results: Insulin resistance index and HOMA-IR levels were higher in the mice of group T as compared to age-matched mice of group C within one month and significantly higher after and five months of feeding. The total area under the glucose tolerance test curve (AUC) and the insulin curve (AUC ins) was found to significantly increase in the mice of T group as compared to the mice of C group as early as two months of feeding and was elevated after 5 months post feeding. Comparison of the Matsuda index revealed that pancreatic beta cell function was significantly lower in mice of T group as compared to mice of C group by five months of feeding. Leptin levels fluctuated during the 1stā4th month and by the 5th month significant hyperleptinaemia was detected. There was no significant change in cortisol levels in mice of group T as compared to mice of group C after five months of feeding.
Conclusions: HFSC feed induces insulin resistance by the first month and progressively impairs glucose tolerance, resulting in hyperleptinaemia by the fifth month in male C57BL/6J mice. (Endokrynol Pol 2016; 67 (6): 592ā598)
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WstÄp: DostÄpnych jest bardzo niewiele badaÅ systematycznych oceniajÄ
cych wystÄ
pienie i progresjÄ zespoÅu metabolicznego na odpowiednich modelach zwierzÄcych. W niniejszej pracy przedstawiono wpÅyw podawania myszom C57BL/6J karmy wysokotÅuszczowej i zawierajÄ
cej cukry proste (HFSC, High Fat Simple Carbohydrate) na sekwencje zdarzeÅ prowadzÄ
cych do zaburzeÅ homeostazy glukozy.
MateriaÅ i metody: JednomiesiÄcznym samcom myszy C57BL/6J podawano przez 5miesiÄcy karmÄ kontrolnÄ
(grupa C) lub HFSC (grupa T) (n = 30 w każdej grupie). TolerancjÄ glukozy oceniono na podstawie doustnego testu tolerancji glukozy (OGTT, oral glucose tolerance test), natomiast stÄżenia insulin i leptyny w surowicy oznaczono, używajÄ
c metody ELISA, a do oznaczenia stÄżenia kortyzolu w surowicy użyto metody CLIA.
Wyniki: WskaÅŗnik insulinoopornoÅci HOMA-IR byÅ wyższy u myszy z grupy T niż u dobranej pod wzglÄdem wieku myszy z grupy C już w ciÄ
gu pierwszego miesiÄ
ca, a po 3 i 5 miesiÄ
cach diety HFSC rĆ³Å¼nice byÅy istotne statystycznie. CaÅkowite pole pod krzywÄ
(AUC, area under the curve) w teÅcie tolerancji glukozy oraz pole pod krzywÄ
insuliny (AUC ins) zwiÄkszyÅo siÄ istotnie u myszy z grupy T w porĆ³wnaniu z myszami z grupy C, co byÅo widoczne już po 2 miesiÄ
cach podawania karmy HFSC i byÅo podwyższone przez 5 miesiÄcy od zakoÅczenia podawania tej karmy. PorĆ³wnanie wskaÅŗnika Matsudy wykazaÅo, że po 5 miesiÄ
cach czynnoÅÄ komĆ³rek beta trzustki byÅa istotnie upoÅledzono u myszy z grupy T w porĆ³wnaniu z myszami z grupy C. StÄżenia leptyny wahaÅy siÄ w okresie 1.ā4. miesiÄ
ca, a po 5 miesiÄ
cach wykryto istotnÄ
hiperleptynemiÄ. Po 3 miesiÄ
cach nie stwierdzono istotnych zmian stÄżeÅ kortyzolu u myszy z grupy T w porĆ³wnaniu z grupÄ
C.
Wnioski: U samcĆ³w myszy C57BL/6J dieta HFSC wywoÅaÅa insulinoopornoÅÄ już po pierwszym miesiÄ
cu, a nastÄpnie powodowaÅa stopniowe pogarszanie tolerancji glukozy, co po piÄciu miesiÄ
cach doprowadziÅo do hiperleptynemii. (Endokrynol Pol 2016; 67 (6): 592ā598)
Insulin resistance precedes glucose intolerance and hyperleptinaemia in high-fat simple carbohydrate-fed C57BL/6J mice
Introduction: Very few systematic studies are done during the onset and progression of metabolic syndrome in suitable animal models. In this paper we present the effect of High-Fat Simple Carbohydrate (HFSC) feed on the metabolic hormones in C57BL/6J mice to understand the sequence of events leading to impairment of glucose homeostasis. Material and methods: One-month-old male C57BL/6J mice were fed with control (C group) and HFSC (T group) feed (n = 30 each) respectively for five months. The glucose tolerance was studied by Oral Glucose Tolerance Test (OGTT) whereas serum insulin and leptin were quantified using ELISA kits, and serum cortisol was quantified using CLIA kits. Results: Insulin resistance index and HOMA-IR levels were higher in the mice of group T as compared to age-matched mice of group C within one month and significantly higher after and five months of feeding. The total area under the glucose tolerance test curve (AUC) and the insulin curve (AUC ins) was found to significantly increase in the mice of T group as compared to the mice of C group as early as two months of feeding and was elevated after 5 months post feeding. Comparison of the Matsuda index revealed that pancreatic beta cell function was significantly lower in mice of T group as compared to mice of C group by five months of feeding. Leptin levels fluctuated during the 1st-4th month and by the 5th month significant hyperleptinaemia was detected. There was no significant change in cortisol levels in mice of group T as compared to mice of group C after five months of feeding. Conclusions: HFSC feed induces insulin resistance by the first month and progressively impairs glucose tolerance, resulting in hyperleptinaemia by the fifth month in male C57BL/6J mice