title: Expression of MHC-I and -II in uterine tissue from early pregnant bitches.
abstract: The aim of the study was to investigate the expression of major histocompatibility complex (MHC)-I and -II in uterine tissues from pregnant and non-pregnant bitches, taken at different time periods after mating. The pregnant bitches were ovariohysterectomized during the pre-implantation (group 1, n = 4), implantation (group 2, n = 7) and placentation stage (group 3, n = 7). Non-pregnant animals in diestrus served as controls (group 4, n = 7). The expression of MHC- I and -II in salpinx, apex, middle horn, corpus uteri and at implantation sites was investigated by immunohistochemistry as well as qualitative and quantitative RT-PCR; MHC-I mRNA was detected in all tissues and with quantitative RT-PCR, and no significant changes were detected until placentation. Immunohistologically, at the apex and corpus site, the average number of MHC-II positive cells increased from the pre-implantation to the post-implantation stage (apex: 1.54 +/- 1.21 to 3.82 +/- 2.93; corpus: 1.62 +/- 1.9 to 5.04 +/- 4.95; p < 0.05). The greatest numbers of MHC-II positive cells were observed at placentation sites (6.64 +/- 5.9). In parallel, a marked increase in the relative mRNA expression of MHC-II in uterine tissues was assessed from the pre-implantation to the placentation stage (relative to Glycerinaldehyd-3-phosphate-Dehydrogenase (GAPDH): 6.9 +/- 9.5, 8.4 +/- 5.8, p > 0.05). Immunohistologically, in the salpinx, significantly greater numbers of MHC-II positive cells were found in the tissues of pregnant animals than in the control group (p < 0.05). It is proposed that the increase in MHC-II is pregnancy-related, even though the impact on maintenance of canine pregnancy is still unclear.
authors.affiliation: Centre for Artificial Insemination and Embryo Transfer, University of Veterinary Science, Vienna, Austria. sabine.schaefer@vu-wien.ac.at
authors.forename: S
authors.initials: S
authors.lastname: Schäfer-Somi
authors.forename: H B
authors.initials: HB
authors.lastname: Beceriklisoy
authors.forename: I
authors.initials: I
authors.lastname: Walter
authors.forename: S
authors.initials: S
authors.lastname: Sabitzer
authors.forename: D
authors.initials: D
authors.lastname: Klein
authors.forename: H
authors.initials: H
authors.lastname: Kanca
authors.forename: D
authors.initials: D
authors.lastname: Kaya
authors.forename: A R
authors.initials: AR
authors.lastname: Agaoglu
authors.forename: H
authors.initials: H
authors.lastname: Izgür
authors.forename: S
authors.initials: S
authors.lastname: Aslan
mesh_terms: D000818:Animals; D004285:Dogs / Q000502:physiology*; D005260:Female; D005805:Genes, MHC Class I / Q000235:genetics / Q000502:physiology*; D005802:Genes, MHC Class II / Q000235:genetics / Q000502:physiology*; D007150:Immunohistochemistry / Q000662:veterinary; D011247:Pregnancy; D011270:Pregnancy, Animal; D014599:Uterus / Q000378:metabolism*