1
|
Xiao L, Song L, Hu J, Zhang Q, Jiang Y, Duan H, Zhang Y, Zhao X, Hua Y. Dihydrotestosterone synthesis in the sheep corpus luteum and its potential mechanism in luteal regression. J Cell Physiol 2019; 234:15182-15193. [PMID: 30671954 DOI: 10.1002/jcp.28159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 01/10/2019] [Indexed: 01/24/2023]
Abstract
Corpus luteum (CL) regression is a complex physiological process. Previous studies have shown that dihydrotestosterone (DHT) may be involved in regulating CL regression, but the mechanism is still unclear. In this study, we evaluated the localization of the two isoforms of DHT synthetase 5α-reductase (5α-red1 and 5α-red2) and androgen receptor (AR) in sheep CL, and investigated 5α-red1, 5α-red2, AR, and DHT levels at different luteal stages of CL (early, middle, and late phase) by immunohistochemistry, quantitative real-time polymerase chain reaction, and western blot analysis. Moreover, we cultured luteal cells from middle phase CL and treated them with different concentrations of DHT (10-10 -10 -6 M) and the AR antagonist flutamide (10 -5 M), to evaluate whether DHT is involved in the regulation of progesterone (P4) secretion and progesterone nuclear receptor (PGR) expression and whether these effects are regulated by the AR pathway. We also investigated the effects of DHT and flutamide on prostaglandin F2α (PGF2α) secretion and apoptotic gene and protein expression. Our results showed that 5α-red1, 5α-red2, and AR were expressed in the CL, and their expression and DHT levels were changed during the luteal phase. DHT was involved in mediating P4 and PGF2α secretion and PGR and apoptotic gene and protein expression. The effects of DHT on CL were at least partially regulated by the AR pathway. This study reveals the mechanism of action of DHT on sheep CL regression and lays the foundation for further exploration of androgen regulation of CL function.
Collapse
Affiliation(s)
- Longfei Xiao
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Liangli Song
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Junjie Hu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Quanwei Zhang
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Yuting Jiang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Hongwei Duan
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Yong Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Xingxu Zhao
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Yongli Hua
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| |
Collapse
|
2
|
Gaja AO, Hamana K, Kubota C, Kojima T. Evaluation of the effect of a 3rd GnRH injection administered six days after the 2nd GnRH injection of Ovsynch on the reproductive performance of Japanese black cows. J Vet Sci 2008; 9:273-9. [PMID: 18716447 PMCID: PMC2811839 DOI: 10.4142/jvs.2008.9.3.273] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
This study was designed to evaluate the reproductive performance of Japanese black cows following the 3rd injection of gonadotropin releasing hormone (GnRH) analogue administered concurrently with Ovsynch-based treatment on day 6 (day 1 = the day of ovulation). In Experiment 1, 12 cows were allocated into three groups: a control group that was subjected to Ovsynch treatment and then injected with a placebo on day 6; group 1 (Ovsynch + GnRH), which was subjected to Ovsynch treatment and was injected with GnRH analogue on day 6, and group 2 (Ovsynch + controlled internal drug-release (CIDR) + GnRH), which received Ovsynch-CIDR treatment and was injected with GnRH analogue on day 6. Blood collection and ultrasonographic observation of the ovaries were conducted daily. Both treatments induced the formation of an accessory corpus luteum and significantly increased the cross-sectional area of the luteal tissue when compared to the control. However, plasma progesterone (P4) was significantly higher in the treatment groups than in the control group on days 11, 12, 17 and 18 in the group 1 and from day 10 to 21 in the group 2. In Experiment 2, 41 cows were assigned to the same three groups described above and then artificially inseminated on day 1. The pregnancy rates on day 45 did not differ among groups. In conclusion, administration of GnRH analogue on day 6 following Ovsynch-based treatment did not improve the reproductive performance of Japanese black cows, even though the P4 concentration was higher in groups that received the GnRH.
Collapse
Affiliation(s)
- Abdurraouf Omar Gaja
- The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan
| | | | | | | |
Collapse
|