Determinants of fetal leptin synthesis, fat mass, and circulating leptin concentrations in well-nourished ewes in late pregnancy

Muhlhausler, B. S. and Roberts, C. T. and Yuen, B. S. J. and Marrocco, E. and Budge, H. and Symonds, M. E. and McFarlane, J. R. and Kauter, K. G. and Stagg, P. and Pearse, J. K. and McMillen, I. C. (2003) Determinants of fetal leptin synthesis, fat mass, and circulating leptin concentrations in well-nourished ewes in late pregnancy. Endocrinology, 144 (11). pp. 4947-4954. ISSN 0013-7227

Abstract

We have investigated the factors regulating leptin synthesis, fat deposition, and circulating leptin concentrations in fetuses of well nourished ewes in late pregnancy. Vascular catheters were surgically inserted in 17 pregnant ewes and their fetuses at 103–120 d gestation (term = 147 ± 3 d). Ewes were fed a diet providing either 100% (control; n = 9) or approximately 155% (well fed; n = 8) of the maintenance energy requirements and fetal perirenal and interscapular fat depots were collected at 139–141 d gestation. There was a significant relationship between the relative mass of fetal unilocular fat and fetal glucose (relative mass of unilocular fat, 1.14; fetal glucose, +0.16; r = 0.50; P < 0.04; n = 17), but not insulin, concentrations in the control and well-fed groups. In contrast to the controls, there was a positive relationship between the relative abundance of leptin mRNA and fetal insulin, but not glucose, concentrations in fetal perirenal adipose tissue in the well-fed group. A moderate increase in maternal nutrition also resulted in a strong reciprocal relationship between uncoupling protein 1 and leptin expression in fetal perirenal adipose tissue in late gestation (well-fed group: uncoupling protein 1 mRNA:18S rRNA, -0.51; leptin mRNA:ß-actin mRNA, +1.53; r = 0.80; P < 0.02; n = 8). These studies provide evidence that fetal glucose and insulin differentially regulate fetal fat deposition and leptin mRNA expression within the fetal perirenal fat depot in the well nourished animal during late gestation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held.
Depositing User: Ms Debbie White
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 09 May 2010 11:56
Last Modified: 17 Sep 2013 06:35
Uncontrolled Keywords: leptin synthesis; fetus; fetal glucose
Fields of Research (FOR2008): 06 Biological Sciences > 0608 Zoology > 060803 Animal Developmental and Reproductive Biology
07 Agricultural and Veterinary Sciences > 0702 Animal Production > 070204 Animal Nutrition
07 Agricultural and Veterinary Sciences > 0702 Animal Production > 070206 Animal Reproduction
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Identification Number or DOI: doi: 10.1210/en.2003-0555
URI: http://eprints.usq.edu.au/id/eprint/7756

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