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Effects of prenatal caffeine exposure on glucose homeostasis of adult offspring rats

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Abstract

Epidemiological evidences show that prenatal caffeine exposure (PCE) could induce intrauterine growth retardation (IUGR). The IUGR offspring also present glucose intolerance and type 2 diabetes mellitus after maturity. We have previously demonstrated that PCE induced IUGR and increased susceptibility to adult metabolic syndrome in rats. This study aimed to further investigate the effects of PCE on glucose homeostasis in adult offspring rats. Pregnant rats were administered caffeine (120 mg/kg/day, intragastrically) from gestational days 11 to 20. PCE offspring presented partial catch-up growth pattern after birth, characterizing by the increased body weight gain rates. Meanwhile, PCE had no significant influences on the basal blood glucose and insulin phenotypes of adult offspring but increased the glucose tolerance, glucose-stimulated insulin section and β cell sensitivity to glucose in female progeny. The insulin sensitivity of both male and female PCE offspring were enhanced accompanied with reduced β cell fraction and mass. Western blotting results revealed that significant augmentation in protein expression of hepatic insulin signaling elements of PCE females, including insulin receptor (INSR), insulin receptor substrate 1 (IRS-1) and the phosphorylation of serine–threonine protein kinase (Akt), was also potentiated. In conclusion, we demonstrated that PCE reduced the pancreatic β mass but increased the glucose tolerance in adult offspring rats, especially for females. The adaptive compensatory enhancement of β cell responsiveness to glucose and elevated insulin sensitivity mainly mediated by upregulated hepatic insulin signaling might coordinately contribute to the increased glucose tolerance.

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Funding

This work was granted by the National Science & Technology Pillar Program of China (No. 2013BAI12B01-3), National Natural Science Foundation of China (Nos. 81220108026, 81430089, 81473290, 81703631) and Hubei Province Health and Family Planning Scientific Research Project (Nos. WJ2017C0003, WJ2017M028).

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Correspondence to Hui Wang.

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Animal experiments were performed in the Center for Animal Experiments of Wuhan University (Wuhan, China), which has been accredited by the Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC International). All animal experimental procedures were approved by and performed in accordance with the Guidelines for the Care and Use of Laboratory Animals of the Chinese Animal Welfare Committee.

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Communicated by: Sven Thatje

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Kou, H., Wang, Gh., Pei, Lg. et al. Effects of prenatal caffeine exposure on glucose homeostasis of adult offspring rats. Sci Nat 104, 89 (2017). https://doi.org/10.1007/s00114-017-1510-4

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  • DOI: https://doi.org/10.1007/s00114-017-1510-4

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