Effects of maternal undernutrition during early pregnancy on apoptosis regulators in the ovine fetal ovary

Lea, R.G., Andrade, L.P., Rae, M.T., Hannah, L.T., Kyle, C.E., Murray, J.F., Rhind, S.M. and Miller, D.W. 2006. Effects of maternal undernutrition during early pregnancy on apoptosis regulators in the ovine fetal ovary. Reproduction. 131, pp. 113-124.

TitleEffects of maternal undernutrition during early pregnancy on apoptosis regulators in the ovine fetal ovary
AuthorsLea, R.G., Andrade, L.P., Rae, M.T., Hannah, L.T., Kyle, C.E., Murray, J.F., Rhind, S.M. and Miller, D.W.
Abstract

This study aimed to determine whether reduced fetal ovary folliculogenesis in ewes undernourished during early/midpregnancy is associated with altered ovarian cell proliferation and/or the expression of apoptosis-regulating genes. Groups of ewes (n = 11–19) were fed either 100% (high; H) or 50% (low; L) of metabolisable energy requirements for live-weight maintenance during selected windows of gestation. All animals were killed at days 50, 65 or 110 of gestation. Between mating and slaughter, control animals were fed the H ration, while animals of other subgroups were fed the L ration from (a) mating to slaughter at 50, 65 or 110 days; (b) 0 to 30 days; (c) 31 to 50 or 65 days; or (d), in the day 110 slaughter group only, from 66 to 110 days. Bouin’s-fixed fetal ovaries were examined for (a) Ki67 immunoexpression (proliferation) and (b) Bax and Mcl-1 (apoptosis-regulating genes) expression by in situ hybridisation (day 110) and immunohistochemistry (days 50, 65 and 110). At day 50, maternal nutrition had no effect on Ki67, predominant in germ cells, or Bax and Mcl-1, predominant in the oocytes. Restricted maternal food intake from 0 to 30 days significantly reduced staining for Ki67 in germ cells at day 65 (P < 0.05) but increased staining in granulosa cells at day 110 (P < 0.05). In animals fed the L ration for 110 days, primordial follicle Bax and Mcl-1 were significantly increased (Bax: P < 0.01; Mcl-1: P < 0.05). Granulosa cell Bax was also increased (P < 0.05). When the L ration was fed from 66 to 110 days, granulosa cell Bax (P < 0.05) and primordial follicle Mcl-1 (P < 0.01) were also significantly increased. In the fetal ovarian vasculature, animals underfed for 0–110 days had significantly elevated perivascular Mcl-1 (P < 0.001) and endothelial Bax expression (P < 0.05). Moreover, at day 110, endothelial Mcl-1 was increased by underfeeding from 0 to 30 days (P < 0.05). These data indicate that maternal undernutrition alters proliferation and the expression of apoptosis-regulating genes in the developing fetal ovary. The precise mechanism depends on the window of maternal food restriction.

JournalReproduction
Journal citation131, pp. 113-124
ISSN1470-1626
YearJan 2006
Digital Object Identifier (DOI)doi:10.1530/rep.1.00844
Publication dates
PublishedJan 2006

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