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Centre for Reproduction and Early Life, Institute of Clinical Research, University of Nottingham, Nottingham NG7 2UH, United Kingdom
Address all correspondence and requests for reprints to: Professor Michael E. Symonds, Academic Division of Child Health, School of Human Development, Queen’s Medical Centre, University Hospital, Nottingham NG7 2UH, United Kingdom. E-mail: michael.symonds{at}nottingham.ac.uk.
Maternal nutrient restriction at specific stages of gestation has differential effects on fetal development such that the offspring are programmed to be at increased risk of a range of adult diseases, including obesity. We investigated the effect of maternal nutritional manipulation through gestation on fetal adipose tissue deposition in conjunction with mRNA abundance for uncoupling protein (UCP)1 and 2, peroxisome proliferator-activated receptors (PPAR)
and 
, together with long and short forms of the prolactin receptor (PRLR). Singleton-bearing ewes were either nutrient restricted (3.2–3.8 MJ day–1 metabolizable energy) or fed to appetite (8.7–9.9 MJ day–1) over the period of maximal placental growth, i.e. between 28 and 80 d gestation. After 80 d gestation, ewes were either fed to calculated requirements, (6.7–7.5 MJ day–1), or to appetite (8.0–10.9 MJ day–1). At term, offspring of nutrient-restricted ewes possessed more adipose tissue, an adaptation that was greatest in those born to mothers that fed to requirements in late gestation. This was accompanied by an increased mRNA abundance for UCP2 and PPAR, an adaptation not seen in mothers re-fed to appetite. Maternal nutrition had no effect on mRNA abundance for UCP1, PPAR, or PRLR. Irrespective of maternal nutrition, mRNA abundance for UCP1 was positively correlated with PPAR and the long and short forms of PRLR, indicating that these factors may act together to ensure that UCP1 abundance is maximized in the newborn. In conclusion, we have shown, for the first time, differential effects of maternal nutrition on key regulatory components of fetal fat metabolism.
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