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Han XF, Li JL, Zhou YQ, Ren XH, Liu GC, Cao XH, Du XG, Zeng XY. Active immunization with GnRH-tandem-dimer peptide in young male rats reduces serum reproductive hormone concentrations, testicular development and spermatogenesis. Asian J Androl 2017. [PMID: 26208395 PMCID: PMC4854110 DOI: 10.4103/1008-682x.156856] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
GnRH sterilization vaccines have been developed for various practical and clinical reasons. However, conjugation of GnRH peptide to carrier protein has many drawbacks, hampering the further commercialization of GnRH vaccines. In this study, a new nonconjugated GnRH vaccine, D-Lys6-GnRH-tandem-dimer peptide (TDK), emulsified in Specol adjuvant was investigated for its immunocastration efficacy in young male rats. Prepubertal male rats were randomly allocated into three groups (n = 12): control (no treatment), surgically castrated or immunized against 100 μg TDK in Specol adjuvant at 6 weeks of age (with a booster 8 weeks later). Blood samples (for antibody titers and hormone concentrations) were collected at 2-week intervals until rats were killed (18 weeks of age). Compared to intact controls, active immunization against TDK reduced (P < 0.05) serum concentrations of testosterone, inhibin B, LH and FSH, prevented the onset of spermatogenesis at puberty. Furthermore, mRNA expressions of GnRH receptor, LH-β and FSH-β in the pituitary, LH receptor, FSH receptor, inhibin α, βA and βB subunit in the testes were decreased in immunocastrated rats compared to intact controls (P < 0.05). These results demonstrate for the first time that GnRH-tandem-dimer peptide emulsified in Specol is a promising veterinary sterilization medicine.
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Affiliation(s)
| | | | | | | | | | | | | | - Xian-Yin Zeng
- Isotope Research Biological Engineering and Application Biology Department, Laboratory, Sichuan Agricultural University, Ya'an 625014, People's Republic of China
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Han X, Gu L, Xia C, Feng J, Cao X, Du X, Zeng X, Song T. Effect of immunization against GnRH on hypothalamic and testicular function in rams. Theriogenology 2014; 83:642-9. [PMID: 25433833 DOI: 10.1016/j.theriogenology.2014.10.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 10/29/2014] [Accepted: 10/29/2014] [Indexed: 11/15/2022]
Abstract
The objective was to determine effects of active immunization against GnRH on reproductive function in Tibetan rams. Peripubertal Tibetan rams (n = 30) were randomly and equally allocated into three groups: control (no treatment); surgically castrated; or immunized against 100-μg d-Lys6-GnRH-tandem-dimer peptide conjugated to ovalbumin in Specol adjuvant at 24 weeks of age (with a booster 8 weeks later). Blood samples (for antibody titers and hormone concentrations) were collected at 4-week intervals until rams were killed (40 weeks). Immunization triggered a good antibody response in all immunized rams (P < 0.01). Compared with intact controls, anti-GnRH immunization reduced (P < 0.01) serum concentrations of testosterone, inhibin A, LH, and FSH, and it induced testicular atrophy (suppression of spermatogenesis). Androstenone concentrations in fat tissues of GnRH-immunized rams were also rendered nondetectable (P < 0.001). Furthermore, mRNA expressions of GnRH receptor, LH-β, and FSH-β in the pituitary and of LH receptor, FSH receptor, and inhibin α and βA subunits in the testes were decreased in immunized rams compared with intact controls (P < 0.05). This was apparently the first report that active immunization against GnRH-tandem-dimer-ovalbumin conjugate in Specol adjuvant was an effective alternative to surgical castration for Tibetan rams under practical Tibetan plateau conditions.
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Affiliation(s)
- Xingfa Han
- Isotope Research Lab, Sichuan Agricultural University, Ya'an, P.R. China
| | - Longjun Gu
- Isotope Research Lab, Sichuan Agricultural University, Ya'an, P.R. China
| | - Chenyang Xia
- Institute of Animal Science, Tibet Academy of Agricultural and Animal Husbandry Science, Lhasa, P.R. China
| | - Jing Feng
- Institute of Animal Science, Tibet Academy of Agricultural and Animal Husbandry Science, Lhasa, P.R. China
| | - Xiaohan Cao
- Isotope Research Lab, Sichuan Agricultural University, Ya'an, P.R. China
| | - Xiaogang Du
- Isotope Research Lab, Sichuan Agricultural University, Ya'an, P.R. China
| | - Xianyin Zeng
- Isotope Research Lab, Sichuan Agricultural University, Ya'an, P.R. China.
| | - Tianzeng Song
- Institute of Animal Science, Tibet Academy of Agricultural and Animal Husbandry Science, Lhasa, P.R. China.
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Fang F, Su S, Liu Y, Zhang Y, Pu Y, Zhao X, Li Y, Cao H, Wang J, Zhou J, Zhang X. Immunization against recombinant GnRH-I alters ultrastructure of gonadotropin cell in an experimental boar model. Reprod Biol Endocrinol 2013; 11:63. [PMID: 23855561 PMCID: PMC3720181 DOI: 10.1186/1477-7827-11-63] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 07/10/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Gonadotropin cell is the main responsible for the secretion of follicle stimulating hormone (FSH) and luteinizing hormone (LH), and immunocastration reduces the concentrations of serum FSH and LH. A few studies have reported the histological structure of gonadotropin cells obtained from immunocastration animals at the light microscopy level. However, the ultrastructure of gonadotropin cells remains largely unexplored. The aim of this study was to evaluate and to compare ultrastructure of gonadotropin cell in gonadally intact boars and immunologically castrated male animals. FINDINGS In this study, serum and adenohypophysis tissue were collected from nine gonadally intact boars and nine male pigs treated with recombinant gonadotropin releasing hormone I (GnRH-I). Anti-GnRH-I antibodies in serum and the ultrastructure of gonadotropin cell in adenohypophysis were determined by enzymelinked immunosorbent assay and electron microscopy, respectively. The results demonstrated that active immunization against recombinant GnRH-I increased serum GnRH-I antibody levels (P<0.05). Ultramicroscopic analysis of gonadotropin cell revealed a decrease (P<0.05) in the number and size of the large granules and small granules in the recombinant GnRH-I immunized animals. CONCLUSIONS We conclude that immunization against recombinant GnRH-I induces severe atrophy of granules in gonadotropin cell of boars, possibly reflecting GnRH-I regulation of gonadotropin cell.
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Affiliation(s)
- Fugui Fang
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Shiping Su
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Ya Liu
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Engineering Research Center of Reproduction and breeding in Sheep of Anhui Province, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Yunhai Zhang
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Engineering Research Center of Reproduction and breeding in Sheep of Anhui Province, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Yong Pu
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Xijie Zhao
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Yunsheng Li
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Engineering Research Center of Reproduction and breeding in Sheep of Anhui Province, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Hongguo Cao
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Engineering Research Center of Reproduction and breeding in Sheep of Anhui Province, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Juhua Wang
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Jie Zhou
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
| | - Xiaorong Zhang
- Anhui Provincial Laboratory of Animal Genetic Resources Protection and Breeding, College of Animal Sciences and Technology, Anhui Agricultural University, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Anhui Provincial Laboratory for Local Livestock and Poultry Genetic Resource Conservation and Bio-Breeding, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
- Engineering Research Center of Reproduction and breeding in Sheep of Anhui Province, No. 130 of Changjiang West Road, Hefei, Anhui 230036, China
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Gökdal O, Atay O, Eren V, Demircioğlu SK. Fattening performance, carcass and meat quality characteristics of Kivircik male lambs. Trop Anim Health Prod 2012; 44:1491-6. [PMID: 22323106 DOI: 10.1007/s11250-012-0093-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2012] [Indexed: 11/26/2022]
Abstract
The objective of this study was to determine the fattening performance and carcass and meat quality characteristics of Kivircik twin male lambs. Twelve lambs at approximately 5 months of age were subjected to a finishing diet for 60 days. Average live weight of lambs at the beginning and the end of the fattening were 23.14 ± 0.84 and 39.0 ± 1.01 kg, respectively. Daily live weight gain and feed conversion efficiency were found as 0.265 ± 0.007 and 6.14 kg, respectively. Hot carcass weight, cold carcass weight, and dressing percentage were 19.6 ± 0.6 and 18.9 ± 0.6 kg and 48.1 ± 0.3%, respectively. Kidney-pelvic fat weight, internal fat weight, and m. longissimus dorsi area were 0.117 ± 0.023 and 0.364 ± 0.041 kg and 15.26 ± 0.70 cm(2), respectively. The percentages of leg, back loin, forearm, shoulder, neck, flank-chest, kidney-pelvic fat, and internal fat in carcasses of the lambs were found as 34.1 ± 0.4%, 19.6 ± 0.3%, 21.0 ± 0.2%, 7.0 ± 0.3%, 10.5 ± 0.3%, 7.2 ± 0.2%, 1.3 ± 0.1%, and 1.8 ± 0.1%, respectively. Averages water content, ash, protein content, and fat content of meat samples were 73.4%, 1.0%, 19.5% and 3.6%, respectively. pH and thiobarbituric acid reactive substances values of meat samples were 5.55 and 0.056 ± 0.017. L*(lightness), a*(redness), and b*(yellowness) values were recorded as 43.87, 12.69, and 10.22, respectively. Thus, we conclude that fattening performance, carcass, and meat quality of Kivircik lambs are satisfactory levels than that of other native breeds.
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Affiliation(s)
- Ozdal Gökdal
- Çine Vocational School, Adnan Menderes University, 09500, Çine-Aydin, Turkey.
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