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Effect of restriction of placental growth on the concentrations of insulin, glucose and placental lactogen in the plasma of sheep

Version 2 2024-06-05, 02:02
Version 1 2019-01-16, 14:51
journal contribution
posted on 2024-06-05, 02:02 authored by J Falconer, Julie OwensJulie Owens, E Allotta, JS Robinson
The effect of restricting placental growth on maternal glucose, insulin and placental lactogen was investigated in 16 ewes carrying singleton lambs. Uterine caruncles were removed from seven ewes (caruncle ewes) before pregnancy, resulting in reduced placental size and retarded intra-uterine fetal growth. The concentration of insulin in maternal plasma was similar in both control and caruncle ewes. The concentration of glucose was significantly higher in the caruncle than in the control ewes (3.26 +/- 0.15 (S.E.M.) mmol/l, number of observations (n) = 9, vs 2.75 +/- 0.1, n = 9, P less than 0.02, and 3.27 +/- 0.16, n = 7, vs 2.46 +/- 0.11, n = 12, P less than 0.001, for the carotid artery and utero-ovarian vein respectively). The concentration of ovine placental lactogen (oPL) in the utero-ovarian vein was reduced in the caruncle compared with the control ewes (283 +/- 65 micrograms/l, n = 8, and 705 +/- 106 micrograms/l, n = 18, P less than 0.02, respectively). Restriction of placental growth by removal of endometrial caruncles similarly reduced the concentrations of oPL in maternal arterial plasma (231 +/- 54 micrograms/l, n = 9, and 621 +/- 96 micrograms/l, n = 18, P less than 0.002). Production of oPL by the placenta was also reduced by limiting placental growth to 30 +/- 11 micrograms/min, n = 8, compared with 133 +/- 43 micrograms/min, n = 15, P less than 0.05, for the controls. Production of oPL per gram of placenta in the caruncle group, although only 34% of the control value, was not reduced significantly.(ABSTRACT TRUNCATED AT 250 WORDS)

History

Journal

Journal of endocrinology

Volume

106

Pagination

7-11

Location

Bradley Stok, Eng.

ISSN

0022-0795

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1985, Journal of Endocrinology Ltd

Issue

1

Publisher

bioscientifica