The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes

Richard G. Lea, Peter Wooding, Ian Stewart, Lisa T. Hannah, Stephen Morton, Karen Wallace, Raymond Aitken, John Milne, Timothy R. Regnault, Russell V. Anthony, Jacqueline Wallace

Research output: Contribution to journalComment/debate

25 Citations (Scopus)

Abstract

Overnourishing pregnant adolescent sheep promotes maternal growth but reduces placental mass, lamb birth weight and circulating progesterone. This study aimed to determine whether altered progesterone reflected transcript abundance for StAR (cholesterol transporter) and the steroidogenic enzymes (Cyp11A1, Hsd3b and Cyp17). Circulating and placental expression of ovine placental lactogen (oPL) was also investigated. Adolescent ewes with singleton pregnancies were fed high (H) or moderate (M) nutrient intake diets to restrict or support placental growth. Experiment 1: peripheral progesterone and oPL concentrations were measured in H (nZ7) and M (nZ6) animals across gestation (days 7–140). Experiment 2: progesterone was measured to mid- (day 81; M: nZ11, H: nZ13) or late gestation (day 130; M: nZ21, H: nZ22), placental oPL, StAR and steroidogenic enzymes were measured by qPCR and oPL protein by immunohistochemistry. Experiment 1: in H vs M animals, term placental (P!0.05), total cotyledon (P!0.01) and foetal size (P!0.05) were reduced. Circulating oPL and progesterone were reduced at mid- (P!0.001, P!0.01) and late gestation (P!0.01, P!0.05) and oPL detection was delayed (P!0.01). Experiment 2: placental oPL was not altered by nutrition. In day 81 H animals, progesterone levels were reduced (P!0.001) but not related to placental or foetal size. Moreover, placental steroidogenic enzymes were unaffected. Day 130 progesterone (P!0.001) and Cyp11A1 (P!0.05) were reduced in H animals with intrauterine growth restriction (HCIUGR). Reduced mid-gestation peripheral oPL and progesterone may reflect altered placental differentiation and/or increased hepatic clearance respectively. Restricted placental growth and reduced biosynthesis may account for reduced progesterone in day 130 HCIUGR ewes.
Original languageEnglish
Pages (from-to)785-796
Number of pages12
JournalReproduction
Volume133
Issue number6
DOIs
Publication statusPublished - Jun 2007

Cite this

The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes. / Lea, Richard G.; Wooding, Peter; Stewart, Ian; Hannah, Lisa T.; Morton, Stephen; Wallace, Karen; Aitken, Raymond; Milne, John; Regnault, Timothy R.; Anthony, Russell V.; Wallace, Jacqueline.

In: Reproduction, Vol. 133, No. 6, 06.2007, p. 785-796.

Research output: Contribution to journalComment/debate

Lea, RG, Wooding, P, Stewart, I, Hannah, LT, Morton, S, Wallace, K, Aitken, R, Milne, J, Regnault, TR, Anthony, RV & Wallace, J 2007, 'The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes', Reproduction, vol. 133, no. 6, pp. 785-796. https://doi.org/10.1530/REP-06-0294e
Lea, Richard G. ; Wooding, Peter ; Stewart, Ian ; Hannah, Lisa T. ; Morton, Stephen ; Wallace, Karen ; Aitken, Raymond ; Milne, John ; Regnault, Timothy R. ; Anthony, Russell V. ; Wallace, Jacqueline. / The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes. In: Reproduction. 2007 ; Vol. 133, No. 6. pp. 785-796.
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title = "The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes",
abstract = "Overnourishing pregnant adolescent sheep promotes maternal growth but reduces placental mass, lamb birth weight and circulating progesterone. This study aimed to determine whether altered progesterone reflected transcript abundance for StAR (cholesterol transporter) and the steroidogenic enzymes (Cyp11A1, Hsd3b and Cyp17). Circulating and placental expression of ovine placental lactogen (oPL) was also investigated. Adolescent ewes with singleton pregnancies were fed high (H) or moderate (M) nutrient intake diets to restrict or support placental growth. Experiment 1: peripheral progesterone and oPL concentrations were measured in H (nZ7) and M (nZ6) animals across gestation (days 7–140). Experiment 2: progesterone was measured to mid- (day 81; M: nZ11, H: nZ13) or late gestation (day 130; M: nZ21, H: nZ22), placental oPL, StAR and steroidogenic enzymes were measured by qPCR and oPL protein by immunohistochemistry. Experiment 1: in H vs M animals, term placental (P!0.05), total cotyledon (P!0.01) and foetal size (P!0.05) were reduced. Circulating oPL and progesterone were reduced at mid- (P!0.001, P!0.01) and late gestation (P!0.01, P!0.05) and oPL detection was delayed (P!0.01). Experiment 2: placental oPL was not altered by nutrition. In day 81 H animals, progesterone levels were reduced (P!0.001) but not related to placental or foetal size. Moreover, placental steroidogenic enzymes were unaffected. Day 130 progesterone (P!0.001) and Cyp11A1 (P!0.05) were reduced in H animals with intrauterine growth restriction (HCIUGR). Reduced mid-gestation peripheral oPL and progesterone may reflect altered placental differentiation and/or increased hepatic clearance respectively. Restricted placental growth and reduced biosynthesis may account for reduced progesterone in day 130 HCIUGR ewes.",
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T1 - The expression of ovine placental lactogen, StAR and progesterone-associated steroidogenic enzymes in placentae of overnourished growing adolescent ewes

AU - Lea, Richard G.

AU - Wooding, Peter

AU - Stewart, Ian

AU - Hannah, Lisa T.

AU - Morton, Stephen

AU - Wallace, Karen

AU - Aitken, Raymond

AU - Milne, John

AU - Regnault, Timothy R.

AU - Anthony, Russell V.

AU - Wallace, Jacqueline

PY - 2007/6

Y1 - 2007/6

N2 - Overnourishing pregnant adolescent sheep promotes maternal growth but reduces placental mass, lamb birth weight and circulating progesterone. This study aimed to determine whether altered progesterone reflected transcript abundance for StAR (cholesterol transporter) and the steroidogenic enzymes (Cyp11A1, Hsd3b and Cyp17). Circulating and placental expression of ovine placental lactogen (oPL) was also investigated. Adolescent ewes with singleton pregnancies were fed high (H) or moderate (M) nutrient intake diets to restrict or support placental growth. Experiment 1: peripheral progesterone and oPL concentrations were measured in H (nZ7) and M (nZ6) animals across gestation (days 7–140). Experiment 2: progesterone was measured to mid- (day 81; M: nZ11, H: nZ13) or late gestation (day 130; M: nZ21, H: nZ22), placental oPL, StAR and steroidogenic enzymes were measured by qPCR and oPL protein by immunohistochemistry. Experiment 1: in H vs M animals, term placental (P!0.05), total cotyledon (P!0.01) and foetal size (P!0.05) were reduced. Circulating oPL and progesterone were reduced at mid- (P!0.001, P!0.01) and late gestation (P!0.01, P!0.05) and oPL detection was delayed (P!0.01). Experiment 2: placental oPL was not altered by nutrition. In day 81 H animals, progesterone levels were reduced (P!0.001) but not related to placental or foetal size. Moreover, placental steroidogenic enzymes were unaffected. Day 130 progesterone (P!0.001) and Cyp11A1 (P!0.05) were reduced in H animals with intrauterine growth restriction (HCIUGR). Reduced mid-gestation peripheral oPL and progesterone may reflect altered placental differentiation and/or increased hepatic clearance respectively. Restricted placental growth and reduced biosynthesis may account for reduced progesterone in day 130 HCIUGR ewes.

AB - Overnourishing pregnant adolescent sheep promotes maternal growth but reduces placental mass, lamb birth weight and circulating progesterone. This study aimed to determine whether altered progesterone reflected transcript abundance for StAR (cholesterol transporter) and the steroidogenic enzymes (Cyp11A1, Hsd3b and Cyp17). Circulating and placental expression of ovine placental lactogen (oPL) was also investigated. Adolescent ewes with singleton pregnancies were fed high (H) or moderate (M) nutrient intake diets to restrict or support placental growth. Experiment 1: peripheral progesterone and oPL concentrations were measured in H (nZ7) and M (nZ6) animals across gestation (days 7–140). Experiment 2: progesterone was measured to mid- (day 81; M: nZ11, H: nZ13) or late gestation (day 130; M: nZ21, H: nZ22), placental oPL, StAR and steroidogenic enzymes were measured by qPCR and oPL protein by immunohistochemistry. Experiment 1: in H vs M animals, term placental (P!0.05), total cotyledon (P!0.01) and foetal size (P!0.05) were reduced. Circulating oPL and progesterone were reduced at mid- (P!0.001, P!0.01) and late gestation (P!0.01, P!0.05) and oPL detection was delayed (P!0.01). Experiment 2: placental oPL was not altered by nutrition. In day 81 H animals, progesterone levels were reduced (P!0.001) but not related to placental or foetal size. Moreover, placental steroidogenic enzymes were unaffected. Day 130 progesterone (P!0.001) and Cyp11A1 (P!0.05) were reduced in H animals with intrauterine growth restriction (HCIUGR). Reduced mid-gestation peripheral oPL and progesterone may reflect altered placental differentiation and/or increased hepatic clearance respectively. Restricted placental growth and reduced biosynthesis may account for reduced progesterone in day 130 HCIUGR ewes.

U2 - 10.1530/REP-06-0294e

DO - 10.1530/REP-06-0294e

M3 - Comment/debate

VL - 133

SP - 785

EP - 796

JO - Reproduction

JF - Reproduction

SN - 1470-1626

IS - 6

ER -