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Ontogeny and nutritional programming of the hepatic growth hormone-insulin-like growth factor-prolactin axis in the sheep

Hyatt, M.A.; Budge, H; Walker, D; Stephenson, T; Symonds, Michael E.

Authors

M.A. Hyatt melanie.hyatt@nottingham.ac.uk

H Budge helen.budge@nottingham.ac.uk

D Walker david.walker@nottingham.ac.uk

T Stephenson terence.stephenson@nottingham.ac.uk

Michael E. Symonds



Abstract

The liver is an important metabolic and endocrine organ in the fetus but the extent to which its hormone receptor (R) sensitivity is developmentally regulated in early life is not fully established. We, therefore, examined developmental changes in mRNA abundance for the growth hormone (GH) and prolactin (PRL) receptors (R) plus insulin-like growth factor (IGF)-I and –II and their receptors. Fetal and postnatal sheep were sampled at either 80, or 140 days gestation, 1, 30 days or six months of age. The effect of maternal nutrient restriction between early to mid (i.e. 28 to 80 days gestation, the time of early liver growth) gestation on gene expression was also examined in the fetus and juvenile offspring. Gene expression for the GHR, PRLR and IGF-IR increased through gestation peaking at birth, whereas IGF-I was maximal near to term. In contrast, IGF-II mRNA decreased between mid and late gestation to increase after birth whereas IGF-IIR remained unchanged. A substantial decline in mRNA abundance for GHR, PRLR and IGF-IR then occurred up to six months. Maternal nutrient restriction reduced GHR and IGF-IIR mRNA abundance in the fetus, but caused a precocious increase in the PRLR. Gene expression for IGF-I and –II were increased in juvenile offspring born to nutrient restricted mothers. In conclusion, there are marked differences in the developmental ontogeny and nutritional programming of specific hormones and their receptors involved in hepatic growth and development in the fetus. These could contribute to changes in liver function during adult life.

Journal Article Type Article
Publication Date Oct 1, 2007
Journal Endocrinology
Print ISSN 0013-7227
Electronic ISSN 1945-7170
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 148
Issue 10
Institution Citation Hyatt, M., Budge, H., Walker, D., Stephenson, T., & Symonds, M. E. (2007). Ontogeny and nutritional programming of the hepatic growth hormone-insulin-like growth factor-prolactin axis in the sheep. Endocrinology, 148(10), doi:10.1210/en.2007-0303
DOI https://doi.org/10.1210/en.2007-0303
Keywords Growth hormone, insulin-like growth factor, prolactin receptor
Publisher URL https://academic.oup.com/endo/article-lookup/doi/10.1210/en.2007-0303
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information The final version of record is available at http://intl-endo.endojournals.org

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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