Expression of vitamin D receptor in the porcine uterus and effect of 1,25(OH)2D3 on progesterone and estradiol-17β secretion by uterine tissues in vitro

Małgorzata Grzesiak , Ewa Waszkiewicz , Magdalena Wojtas , Kinga Kowalik , Anita Franczak


Vitamin D3 acting via its nuclear receptor (VDR) was shown to target many reproductive tissues and regulate their function. Nevertheless, little is known about the role of vitamin D3 and VDR in the uterus. We hypothesized that VDR expression profile varies in the porcine uterus throughout the course of the estrous cycle, and 1,25(OH)2D3 influences uterine steroidogenic activity. The aim of this study was to investigate VDR mRNA expression, VDR protein abundance and immunolocalization in the porcine endometrium and myometrium harvested on Days 2–5, 12–13, 15–16 and 18–20 of the estrous cycle. Additionally, in studied pigs, 25OHD concentration in plasma and uterine flushings was determined by RIA. The effect of 1,25(OH)2D3 (10, 50 and 100 ng/mL) in vitro on progesterone (P4) and estradiol-17β (E2) release by endometrial and myometrial slices obtained on Days 12–13 of the estrous cycle was also examined. Nuclear VDR immunostaining was found in endometrial (luminal and glandular epithelium, stromal cells) and myometrial cells throughout examined days of the estrous cycle. In the endometrium, the highest VDR mRNA expression was observed on Days 12–13 and 18–20, whereas the greatest VDR protein abundance was noted only on Days 12–13 of the estrous cycle. In the myometrium, either VDR transcript or protein level was the greatest on Days 12–13. Interestingly, the highest 25OHD concentration in plasma and uterine flushings was shown also on Days 12–13 of the estrous cycle. 1,25(OH)2D3 did not affect P4 release by uterine slices while myometrial release of E2 was significantly increased in response to 1,25(OH)2D3 (10 and 50 ng/mL). Overall, obtained results indicate that porcine uterus is a target tissue for vitamin D3 throughout the entire estrous cycle. VDR mRNA expression and protein abundance altered within uterine tissues depending on studied days of the estrous cycle with the greatest protein abundance during mid-luteal phase of the estrous cycle in both uterine tissues. In addition, 1,25(OH)2D3 significantly increased myometrial release of E2 on Days 12–13 of the estrous cycle. These results suggest the role of vitamin D3-VDR system in the uterus, especially as a regulator of myometrial estrogenic activity in pigs during mid-luteal phase of the estrous cycle.
Author Małgorzata Grzesiak (FoAS / DoAPaE)
Małgorzata Grzesiak,,
- Department of Animal Physiology and Endocrinology
, Ewa Waszkiewicz
Ewa Waszkiewicz,,
, Magdalena Wojtas (FoAS / DoAPaE)
Magdalena Wojtas,,
- Department of Animal Physiology and Endocrinology
, Kinga Kowalik (DoAS / DoAPaE)
Kinga Kowalik,,
- Department of Animal Physiology and Endocrinology
, Anita Franczak
Anita Franczak,,
Journal seriesTheriogenology, ISSN 0093-691X, e-ISSN 1879-3231, (N/A 140 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in EnglishVitamin D3, Vitamin D receptor, Endometrium, Myometrium, Pig
ASJC Classification3402 Equine; 3403 Food Animals; 3404 Small Animals; 1103 Animal Science and Zoology
Internal identifierWHiBZ/2019/17
Languageen angielski
Score (nominal)140
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.338; WoS Impact Factor: 2018 = 2.299 (2) - 2018=2.316 (5)
Citation count*
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FinansowanieThis work was financially supported by a grant of University Center of Veterinary Medicine JU-AU (no. 30/99/003 dedicated to M.G.) and partially by grant from the University of Warmia and Mazury in Olsztyn (no. 12.610.005-300)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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