Expression of nuclear and membrane progesterone receptors in the canine oviduct during the periovulatory period
M. Z. Tahir A B , K. Reynaud A B , B. Grimard A B , S. Thoumire A B , S. Chastant-Maillard C D and M. Saint-Dizier A B E F
+ Author Affiliations
- Author Affiliations
A INRA, UMR1198 Biologie du Développement et Reproduction, F-78350 Jouy en Josas, France.
B ENVA, UMR1198 Biologie du Développement et Reproduction, F-94704 Maisons-Alfort Cedex, France.
C INRA, UMR 1225, IHAP, F-31076 Toulouse, France.
D Université de Toulouse, INP, ENVT, UMR 1225, IHAP, F-31076 Toulouse, France.
E AgroParisTech, UFR Génétique Elevage Reproduction, F-75231 Paris Cedex 05, France.
F Corresponding author. Email: stdizier@agroparistech.fr
Submitted: 4 April 2012 Accepted: 27 September 2012 Published: 12 November 2012
Abstract
Important reproductive events take place in the canine oviduct in the presence of increasing concentrations of progesterone (P4). To investigate the potential effects of P4 on the canine oviduct, the expression of nuclear (PR) and membrane (PGRMC1 and 2, mPRα, β and γ) P4 receptors was studied by quantitative RT-PCR and immunohistochemistry. Oviducts were collected from Beagle bitches after the onset of pro-oestrus and before the LH peak (Pre-LH), after the LH peak and before ovulation (Pre-ov) and on Days 1, 4 and 7 post-ovulation (n = 6 bitches/stage). PR mRNA concentrations decreased from Pre-LH to Day 7 in the ampulla and isthmus, whereas both PGRMC1 and 2 mRNA levels increased over the same period. The main change in mPR expression was an increase in mPRβ and γ mRNAs at Day 7 in the isthmus. Furthermore, PR proteins were expressed in the nuclei of luminal epithelial, stromal and muscular cells, whereas the expression of PGRMCs and mPRs was primarily cytoplasmic and localised in the luminal epithelium. The immunostaining for PR decreased at Day 4 in the stroma and muscle, whereas it remained strong in the epithelium from Pre-LH to Day 7. PGRMC1 staining was strong at Days 4 and 7 whereas PGRMC2 was highly expressed from Pre-ov to Day 7. The most intense immunostaining signals for all three mPRs were observed at Day 7. Our results strongly support the hypothesis that P4 is an important regulator of oviductal functions in the bitch through complementary classical and non-classical P4 pathways.
Additional keywords : fallopian tube, PAQR5, PAQR7, PAQR8, uterine tube.
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