TY - JOUR
T1 - Regulation of bovine and ovine lymphocyte proliferation by progesterone
T2 - Modulation by steroid receptor antagonists and physiological status
AU - Monterroso, V. H.
AU - Hansen, P. J.
PY - 1993
Y1 - 1993
N2 - Lectin-stimulated sheep and cow lymphocytes were used to test whether inhibitors of classical steroid receptors block suppressive effects of progesterone and whether effects of progesterone vary with physiological status. Neither RU 38486 nor RU 43044 blocked the inhibitory effects of progesterone on lymphocyte proliferation. Rather, these antagonists were themselves inhibitory. Effects of progesterone and antagonists were additive: the percentage inhibition caused by progesterone was similar whether antagonists were present or not. The degree of lymphocyte proliferation and the inhibitory effects of progesterone were of the same magnitude for pregnant/lactating cows, pregnant/non-lactating cows, postpartum/lactating cows and cyclic/non-lactating cows. In conclusion, progesterone does not appear to inhibit lymphocyte proliferation through actions that involve classical steroid receptors. There was no evidence that lymphocyte proliferation in the cow is suppressed during pregnancy or that the inhibitory effects of progesterone increase during pregnancy.
AB - Lectin-stimulated sheep and cow lymphocytes were used to test whether inhibitors of classical steroid receptors block suppressive effects of progesterone and whether effects of progesterone vary with physiological status. Neither RU 38486 nor RU 43044 blocked the inhibitory effects of progesterone on lymphocyte proliferation. Rather, these antagonists were themselves inhibitory. Effects of progesterone and antagonists were additive: the percentage inhibition caused by progesterone was similar whether antagonists were present or not. The degree of lymphocyte proliferation and the inhibitory effects of progesterone were of the same magnitude for pregnant/lactating cows, pregnant/non-lactating cows, postpartum/lactating cows and cyclic/non-lactating cows. In conclusion, progesterone does not appear to inhibit lymphocyte proliferation through actions that involve classical steroid receptors. There was no evidence that lymphocyte proliferation in the cow is suppressed during pregnancy or that the inhibitory effects of progesterone increase during pregnancy.
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U2 - 10.1530/acta.0.1290532
DO - 10.1530/acta.0.1290532
M3 - Article
C2 - 8109187
AN - SCOPUS:0027787765
SN - 0001-5598
VL - 129
SP - 532
EP - 535
JO - Acta Endocrinologica
JF - Acta Endocrinologica
IS - 6
ER -