Secretion of bovine uterine proteins in response to type I interferons.
Bovine interferon-tau (bIFN-tau) is secreted by the developing conceptus and initiates antiluteolytic events by interacting with uterine membrane receptors. We have identified three endometrial proteins (approximately 8, 16, and 28 kDa; P8, P16, and P28; respectively) that are secreted in response to recombinant (r) bIFN-tau. The objective of this study was to determine whether or not secretion of these proteins was a unique response to IFN-tau during early pregnancy. Three experiments were designed to examine secretion of endometrial proteins as a function of time in culture (0, 3, 6, 12, 18, 24 h), stage of the estrous cycle and pregnancy (Days 15, 18, 0/21), and dose of Type I IFN (0, 0.5, 5, and 25 nM; rbIFN-tau, rbIFN-alpha, and roIFN-tau). Endometrium was cultured for times specified with L-[3H]leusine to generate radiolabeled proteins. Secreted proteins were quantitated by using one-dimensional (1D)-PAGE, fluorography, and densitometry. Secretion of P8, P16, and P28 increased over time (p < 0.0001) in culture and in response to 25 nM rbIFN-tau (p < 0.05). Secretion of P8 in response to rbIFN-tau was higher (p < 0.05). Secretion of P8 in response to rbIFN-tau was higher (p < 0.0005) in endometrium collected from pregnant than nonpregnant heifers, but did not differ across the days examined. Although secretion of P8 was higher (p < 0.0001) in the presence than in the absence of rbIFN-tau, it was not affected by rbIFN-alpha.(ABSTRACT TRUNCATED AT 250 WORDS)
Naivar
K A
KA
Department of Animal Science, University of Wyoming Laramie 82071, USA.
Ward
S K
SK
Austin
K J
KJ
Moore
D W
DW
Hansen
T R
TR
D000818:Animals; D002417:Cattle / Q000378:metabolism*; D046508:Culture Techniques; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D004971:Estrus / Q000502:physiology; D005260:Female; D007370:Interferon Type I / Q000008:administration & dosage / Q000494:pharmacology*; D008970:Molecular Weight; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000008:administration & dosage / Q000494:pharmacology*; D011506:Proteins / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors; D014599:Uterus / Q000378:metabolism*
D007370:Interferon Type I; D011257:Pregnancy Proteins; D011506:Proteins; D011994:Recombinant Proteins; C020947:interferon tau