1
|
Wohlres-Viana S, Arashiro EKN, Minare TP, Fernandes CAC, Grazia JGV, Siqueira LGB, Machado MA, Viana JHM. Differential expression of LHCGR and its isoforms is associated to the variability in superovulation responses of Gir cattle. Theriogenology 2018; 126:68-74. [PMID: 30530160 DOI: 10.1016/j.theriogenology.2018.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 11/19/2018] [Accepted: 12/01/2018] [Indexed: 10/27/2022]
Abstract
The aim of this study was to evaluate the pattern of expression of LHCGR isoforms in Gir heifers characterized as good (10.3 ± 1.2 ova/embryos per flush, n = 5) or poor responders (1.1 ± 0.3 ova/embryos per flush, n = 5) to superovulation protocols. In both groups, an adapted ultrasound-guided follicular aspiration system was used to collect granulosa cells from 8 mm follicles formed either during a synchronized, non-stimulated follicular wave (no stimulation control, NS) or on the fourth day of a superovulation protocol (SOV) induced with 200 IU of pFSH. The recovered follicular fluid was centrifuged and granulosa cells were washed with NaCl 0.9% and kept in RNAlater®. RNA extraction was performed using a commercial RNeasy Micro Kit and eluted samples were quantified and reverse transcribed using the commercial Superscript III kit. cDNA samples were amplified by real-time PCR using a primer to target LH/hCG receptor gene - not selective for LHCGR isoforms (total LHCGR) - and four sets of isoforms selective primers (S1, S10, S10 + 11, and S11). Analyses were performed using the REST software and expression levels are shown as mean ± SEM. Under physiological conditions (NS), poor responders had a higher expression of total LHCGR (4.9 ± 1.7 fold-change, P < 0.01) as well as isoforms S10, S11 and S10 + 11, compared to good responders. In both phenotypes, superovulation down-regulated total LHCGR expression (-0.5 ± 0.2 and -0.9 ± 0.0 for good and poor responders, respectively; P < 0.05). However, in poor responders the exogenous FSH treatment up-regulated the S10 (2.4 ± 2.0; P < 0.05), S10 + 11 (3.8 ± 3.2; P < 0.01), and S1 isoforms (1.8 ± 1.3; P < 0.05), compared to good responders We conclude that down-regulation of total LHCGR, associated to up-regulation of their inactive isoforms, may have compromised follicle development and thus contributed to the low efficiency of superovulation in heifers with a poor responder phenotype.
Collapse
Affiliation(s)
- S Wohlres-Viana
- Universidade Federal de Juiz de Fora, Juiz de Fora, MG, 36036-900, Brazil
| | - E K N Arashiro
- Universidade Federal Fluminense, Niteroi, RJ, 24230-340, Brazil
| | - T P Minare
- Universidade José do Rosário Vellano, Alfenas, MG, 37130-000, Brazil
| | - C A C Fernandes
- Universidade José do Rosário Vellano, Alfenas, MG, 37130-000, Brazil; Biotran Biotecnologia Animal LTDA, Alfenas, MG, 37130-000, Brazil
| | - J G V Grazia
- Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - L G B Siqueira
- Embrapa Gado de Leite, Juiz de Fora, MG, 36038-330, Brazil
| | - M A Machado
- Universidade Federal de Juiz de Fora, Juiz de Fora, MG, 36036-900, Brazil; Embrapa Gado de Leite, Juiz de Fora, MG, 36038-330, Brazil
| | - J H M Viana
- Universidade José do Rosário Vellano, Alfenas, MG, 37130-000, Brazil; Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, 70770-901, Brazil.
| |
Collapse
|
2
|
Martinez IYH, Santos APC, Bottino MP, Orlandi RE, Santos G, Simões LMS, Souza JC, Díaza AMG, Binelli M, Sales JNS. Molecular and endocrine factors involved in future dominant follicle dynamics during the induction of luteolysis in Bos indicus cows. Theriogenology 2018; 111:78-83. [PMID: 29428848 DOI: 10.1016/j.theriogenology.2018.01.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 10/18/2022]
Abstract
The growth profiles of the future dominant follicle (DF) and subordinate follicle (SF) and the gene expression of the granulosa cells during luteolysis induction in Bos indicus cows were evaluated. Forty cows were synchronized with a progesterone and estradiol based protocol. After synchronization, cows with a corpus luteum (CL) were evaluated by ultrasonography every 12 h, beginning at eight days post ovulation. Cows identified with a follicle of at least 6.0 mm in diameter in the second wave were split into two groups (BD-before follicular deviation and AD-after follicular deviation. In the BD group cows received 500 μg of cloprostenol (a synthetic analogue of prostaglandin F2α) when the DF reached a mean diameter of 7.0 mm (6.5-7.5 mm). In the AD group, cows received 500 μg of cloprostenol when the DF reached a mean diameter of 8.0 mm (7.5-8.5 mm). Cows in both groups were submitted to aspiration of the DF at 96 and 72 h after prostaglandin was given. Follicular aspirations were performed to quantify IGF1R, LHR and PAPPA transcripts in the granulosa cells. The diameter of the DF at the moment of prostaglandin administration (P = 0.001) and the growth rate of the SF (P = 0.05) were greater in the AD group. There was greater abundance of LHR transcripts in BD cows (P = 0.04). The remaining variables tested were similar between the experimental groups (P > 0.05). In conclusion, the induction of luteolysis before follicular deviation does not interfere with dominant follicle dynamics. However, it causes granulosa cell LHR down regulation.
Collapse
Affiliation(s)
- I Y H Martinez
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| | - A P C Santos
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil.
| | - M P Bottino
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| | - R E Orlandi
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| | - G Santos
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| | - L M S Simões
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| | - J C Souza
- Department of Animal Science, UFLA, Lavras, Minas Gerais, Brazil
| | - A M G Díaza
- Department of Animal Reproduction, FMVZ-USP, Pirassununga, São Paulo, Brazil
| | - M Binelli
- Department of Animal Reproduction, FMVZ-USP, Pirassununga, São Paulo, Brazil
| | - J N S Sales
- Department of Veterinary Medicine, UFLA, Lavras, Minas Gerais, Brazil
| |
Collapse
|