OBJECTIVE: To study changes of glycolipid metabolism and adipocyte function in an catch-up growth intrauterine growth retardation (IUGR) rat model. METHODS: IUGR rat model was established by maternal nutrition restriction during pregnancy. Newborn IUGR pups were used as IUGR group, and normal newborn pups were used as control group (appropriate for gestational age, AGA group). At age of 12 weeks, plasma samples were collected for the test of triglyceride (TG), total cholesterol (TC), low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C), adiponectin and acylation stimulating protein (ASP). Oral glucose tolerance test (OGTT) was performed for the test of glucose and insulin levels, and insulin resistance index (IRI) was calculated. Expression of glucose transfer 4 (GLUT-4) in adipocytes was examined by confocal microscopy. RESULTS: Body weight and BMI in the IUGR group were significantly higher than in the AGA group by 12 weeks (P<0.01), and plasma TC, TG and LDL-C levels in the IUGR group were higher than in the AGA group, but HDL-C was lower (P<0.05). In the OGTT test, blood glucose level and IRI score in the IUGR group were higher than in the AGA group (P<0.05). Compared with the AGA group, the IUGR group had a higher ASP level (P<0.05) and a lower adiponection level (P<0.05). GLUT4 expression in the adipocytes was significantly lower in the IUGR group than in the AGA group (P<0.05). CONCLUSIONS: Catch-up growth may be obviously noted in IUGR rats after birth. Both hyperlipidaemia and insulin resistance occur at age of 12 weeks. Dysfunction of adipocytes decreased expression of GLUT-4 may be risk factors for insulin resistance in IUGR rats.
Key words
Intrauterine growth retardation /
Insulin resistance /
Adipocyte /
Catch-up growth /
Rats
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