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Han X, Xia X, Chen W, Meng F, Cao X, Bu G, Gan T, Du X, Liang Q, Zeng X. Efficacy of Immunization against a Novel Synthetic 13-Amino Acid Betaglycan-Binding Peptide Sequence of Inhibin α Subunit on Promoting Fertility in Female Rats. Int J Mol Sci 2023; 24:ijms24086914. [PMID: 37108077 PMCID: PMC10138769 DOI: 10.3390/ijms24086914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/30/2023] [Accepted: 04/04/2023] [Indexed: 04/29/2023] Open
Abstract
Inhibins suppress the FSH production in pituitary gonadotrope cells by robustly antagonizing activin signaling by competitively binding to activin type II receptors (ACTR II). The binding of inhibin A to ACTR II requires the presence of its co-receptor, namely, betaglycan. In humans, the critical binding site for betaglycan to inhibin A was identified on the inhibin α subunit. Through conservation analysis, we found that a core 13-amino-acid peptide sequence <VRTTSDGGYSFKY> within the betaglycan-binding epitope on human inhibin α subunit is highly conserved across species. Based on the tandem sequence of such a conserved 13-amino-acid betaglycan-binding epitope (INHα13AA-T), we developed a novel inhibin vaccine and tested its efficacy in promoting female fertility using the female rat as a model. Compared with placebo-immunized controls, INHα13AA-T immunization induced a marked (p < 0.05) antibody generation, enhanced (p < 0.05) ovarian follicle development, and increased ovulation rate and litter sizes. Mechanistically, INHα13AA-T immunization promoted (p < 0.05) pituitary Fshb transcription and increased (p < 0.05) serum FSH and 17β-estradiol concentrations. In summary, active immunization against INHα13AA-T potently increased FSH levels, ovarian follicle development, ovulation rate and litter sizes, thus causing super-fertility in females. Therefore, immunization against INHα13AA is a promising alternative to the conventional approach of multiple ovulation and super-fertility in mammals.
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Affiliation(s)
- Xingfa Han
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xue Xia
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Weihao Chen
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Fengyan Meng
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xiaohan Cao
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Guixian Bu
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Tian Gan
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xiaogang Du
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Qiuxia Liang
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xianyin Zeng
- Isotope Research Lab, College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
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2
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Review: Role and regulatory mechanism of inhibin in animal reproductive system. Theriogenology 2023; 202:10-20. [PMID: 36878034 DOI: 10.1016/j.theriogenology.2023.02.016] [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: 06/24/2022] [Revised: 02/14/2023] [Accepted: 02/15/2023] [Indexed: 03/03/2023]
Abstract
Inhibin (INH) is a glycoprotein hormone secreted by the gonads that inhibit the synthesis and secretion of follicle-stimulating hormone (FSH). Increasing evidence indicates that INH plays a significant role in the development of the reproductive system including follicle development, ovulation rate, corpus luteum formation and ablation, steroid hormone synthesis and spermatogenesis, subsequently affecting the reproductive capacity of animals such as litter size and egg production. There are currently three main views on how INH inhibits FSH synthesis and secretion: influencing the activity of adenylate cyclase, the expression of follicle-stimulating hormone receptor or gonadotropin-releasing hormone receptor, and the competition system of inhibin-activin. This review discusses the current findings on the structure, function, and mechanism of action of INH in the reproductive system of animals.
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3
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Chen F, Lu J, Guo R, Mei C, Guo B, Li W, Tsigkou A, Shi Z. Rectifying cow infertility under heat stress by immunization against inhibin and supplementation of progesterone. Domest Anim Endocrinol 2022; 80:106726. [PMID: 35413656 DOI: 10.1016/j.domaniend.2022.106726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 03/03/2022] [Accepted: 03/04/2022] [Indexed: 11/25/2022]
Abstract
This study was undertaken for the development of novel techniques that are based on immunoneutralization of inhibin bioactivity to improve Holstein cow fertility. A series of 4 experiments were carried out on 2 farms that were located in subtropical or temperate regions, to test the effects of immunization against inhibin alpha subunit on cow fertility under varying degrees of heat stress conditions. Though immunization against inhibin alone improved conception rate (CR) after TAI moderately in cows under mild heat stress conditions, the treatment plus progesterone supplementation substantially enhanced CR in the range of 25 to 35 percentages from severe heat stress to comfortable weather conditions. There existed an additive effect between immunization against inhibin and progesterone supplementation that maximally enhanced CR. Further, immunization against inhibin increased both FSH and activin A concentrations in blood during both follicular and luteal phases. It also significantly increased blood concentrations of E2 in the follicular phase but decreased P4 concentrations during the early pregnancy. However, interferon-tau concentrations in blood around the time of pregnancy recognition were doubled in the inhibin immunized cows. In conclusion, immunization against inhibin plus P4 treatment enhances ovarian follicle and the subsequent early embryo developments that help to greatly improve the fertility of Holstein dairy cows.
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Affiliation(s)
- F Chen
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - J Lu
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450002, China; Nanjing Eason Science & Technology Co.,Ltd., Nanjing, Jiangsu Province, 215316, China
| | - R Guo
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - C Mei
- Dongying Austasia Modern Dairy Farm Co., Ltd., Dongying 257345, China
| | - B Guo
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - W Li
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450002, China
| | - A Tsigkou
- Department of Biology, Duke Kunshan University, Kunshan, Kunshan, 215316, China
| | - Z Shi
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
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4
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Walton KL, Goney MP, Peppas Z, Stringer JM, Winship A, Hutt K, Goodchild G, Maskey S, Chan KL, Brûlé E, Bernard DJ, Stocker WA, Harrison CA. Inhibin Inactivation in Female Mice Leads to Elevated FSH Levels, Ovarian Overstimulation, and Pregnancy Loss. Endocrinology 2022; 163:6543938. [PMID: 35255139 PMCID: PMC9272799 DOI: 10.1210/endocr/bqac025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Indexed: 11/21/2022]
Abstract
Inhibins are members of the transforming growth factor-β family, composed of a common α-subunit disulfide-linked to 1 of 2 β-subunits (βA in inhibin A or βB in inhibin B). Gonadal-derived inhibin A and B act in an endocrine manner to suppress the synthesis of follicle-stimulating hormone (FSH) by pituitary gonadotrope cells. Roles for inhibins beyond the pituitary, however, have proven difficult to delineate because deletion of the inhibin α-subunit gene (Inha) results in unconstrained expression of activin A and activin B (homodimers of inhibin β-subunits), which contribute to gonadal tumorigenesis and lethal cachectic wasting. Here, we generated mice with a single point mutation (Arg233Ala) in Inha that prevents proteolytic processing and the formation of bioactive inhibin. In vitro, this mutation blocked inhibin maturation and bioactivity, without perturbing activin production. Serum FSH levels were elevated 2- to 3-fold in InhaR233A/R233A mice due to the loss of negative feedback from inhibins, but no pathological increase in circulating activins was observed. While inactivation of inhibin A and B had no discernible effect on male reproduction, female InhaR233A/R233A mice had increased FSH-dependent follicle development and enhanced natural ovulation rates. Nevertheless, inhibin inactivation resulted in significant embryo-fetal resorptions and severe subfertility and was associated with disrupted maternal ovarian function. Intriguingly, heterozygous Inha+/R233A females had significantly enhanced fecundity, relative to wild-type littermates. These studies have revealed novel effects of inhibins in the establishment and maintenance of pregnancy and demonstrated that partial inactivation of inhibin A/B is an attractive approach for enhancing female fertility.
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Affiliation(s)
- Kelly L Walton
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
- School of Biomedical Sciences, The University of Queensland, Brisbane, Australia
- Correspondence: Kelly L Walton, PhD, School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia 4072.
| | - Monica P Goney
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Zoe Peppas
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Jessica M Stringer
- Department of Anatomy and Developmental Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Amy Winship
- Department of Anatomy and Developmental Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Karla Hutt
- Department of Anatomy and Developmental Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Georgia Goodchild
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Shreya Maskey
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Karen L Chan
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Emilie Brûlé
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
| | - Daniel J Bernard
- Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada
| | - William A Stocker
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Australia
| | - Craig A Harrison
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia
- Correspondence: Craig A Harrison, PhD, Monash Biomedicine Discovery Institute, Monash University, Clayton, Australia 3168.
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5
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Jia R, Chen X, Zhu Z, Huang J, Yu F, Zhang L, Ogura A, Pan J. Improving ovulation in gilts using anti-inhibin serum treatment combined with fixed-time artificial insemination. Reprod Domest Anim 2020; 56:112-119. [PMID: 33152153 DOI: 10.1111/rda.13854] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 10/31/2020] [Accepted: 11/03/2020] [Indexed: 11/28/2022]
Abstract
For successful batch farrowing, porcine oestrus and ovulation must be synchronized using fixed-time artificial insemination (FTAI). However, exogenous gonadotropins, which are currently used in FTAI, negatively affect gilt ovulation. Here, we aimed to improve sexually mature gilt superovulation efficiency using passive immunization against inhibin during FTAI. Altrenogest-treated gilts were challenged with 10 ml anti-inhibin serum (AIS group, n = 6), 1,000 IU pregnant mare serum gonadotropin (PMSG group, n = 6), or 10 ml goat serum (control group, n = 6). Gilts in the AIS and PMSG groups were inseminated according to the FTAI protocol, and gilts in the control group were inseminated during natural oestrus. When PMSG was replaced by AIS during FTAI of gilts, ovulation rate and embryos recovered were significantly greater in the AIS group as compared to the other two groups (p < .05). Especially the average number of 6-8-cell embryos in the AIS group was significantly higher than that in the PMSG group (p < .01). Moreover, the blastocyst number in the AIS group was significantly higher than that in the PMSG group and the control group (p < .05). But there was no significant difference in the blastocyst number between the PMSG group and the control group (p > .05). Besides, plasma levels of estradiol-β (E2) and progesterone (P4) were significantly greater in the AIS group as compared to the other two groups on Day 23 and D 27, respectively (p < .01). In summary, we devised an improved high-yield FTAI protocol for sexually mature gilts using AIS; this protocol had a greater superovulation efficiency than the FTAI using PMSG.
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Affiliation(s)
- Ruoxin Jia
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China.,Department of Reproduction, the Third of Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Xiaoyu Chen
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China
| | - Zhiwei Zhu
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China.,Ningbo Kuangdai Livestock Husbandry Technology Co. Ltd., Ningbo, China
| | - Jing Huang
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China.,Ningbo Kuangdai Livestock Husbandry Technology Co. Ltd., Ningbo, China
| | - Fuxian Yu
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China
| | - Liang Zhang
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China
| | - Atsuo Ogura
- RIKEN Bioresource Research Center, Tsukuba, Japan
| | - Jianzhi Pan
- Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agriculture Science, Hangzhou, China.,Ningbo Kuangdai Livestock Husbandry Technology Co. Ltd., Ningbo, China
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Chen WZ, Li YM, Yu X, Li Y, Li WK, Wang QL, Liang AX, Li X, Yang LG, Han L. The efficacy, biodistribution and safety of an inhibin DNA vaccine delivered by attenuated Salmonella choleraesuis. Microb Biotechnol 2017; 11:248-256. [PMID: 29205848 PMCID: PMC5743813 DOI: 10.1111/1751-7915.13029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 09/17/2017] [Accepted: 10/31/2017] [Indexed: 11/30/2022] Open
Abstract
DNA vaccines, the third‐generation vaccines, were extensively studied. The attenuated Salmonella choleraesuis (S. choleraesuis) was widely focused as a carrier to deliver DNA vaccines in the chromosome–plasmid balanced‐lethal system. The efficacy of inhibin DNA vaccine delivered by attenuated S. choleraesuis was proved in mice and cows in our previous studies. In this study, the efficacy of inhibin DNA vaccine was confirmed in rhesus monkeys. To further study the biodistribution and safety, the mice were immunized under laboratory conditions. The results of the rhesus monkeys showed the plasma IgA and IgG titres against inhibin were elevated, and the oestradiol (E2) and progesterone (P4) levels were increased with immunizing inhibin DNA vaccine. The biodistribution and safety assessment displayed the body weight, pathological change and haematology indexes where there is no significant difference between vaccinated mice and control. And the genomics analysis showed there was no integration of the inhibin gene into the mouse genome 2 months after immunization. This study indicated the inhibin DNA vaccine delivered by attenuated S. choleraesuis was safe. And this vaccine was a potential means to improve their reproductive traits in primates and other animals.
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Affiliation(s)
- Wei-Zhen Chen
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ying-Mei Li
- Tianjin Helaiente biological science and Technology Co., Ltd, Tianjin, 301709, China
| | - Xue Yu
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yue Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wen-Ke Li
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qing-Ling Wang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ai-Xin Liang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiang Li
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Li-Guo Yang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Li Han
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
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7
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Liu Q, Rehman ZU, Liu JJ, Han L, Liu XR, Yang LG. Nasal immunization with inhibin DNA vaccine delivered by attenuated Salmonella choleraesuis for improving ovarian responses and fertility in cross-bred buffaloes. Reprod Domest Anim 2016; 52:189-194. [PMID: 27862394 DOI: 10.1111/rda.12876] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 09/24/2016] [Indexed: 01/19/2023]
Abstract
This study was conducted to determine the effect of immunization with inhibin DNA vaccine delivered by attenuated Salmonella choleraesuis on ovarian responses and fertility in cross-bred buffaloes. A total of 134 cross-bred buffaloes were divided into four groups: groups T1 (n = 34), T2 (n = 35) and T3 (n = 31) were nasal immunized twice a day with 10 ml of 1 × 1010 CFU/ml of the C501 (pVAX-asd-IS) vaccine for 5, 3 and 1 day, respectively. Group C (n = 34) was nasal immunized with 10 ml PBS for 5 days. All animals were immunized twice with an interval of 14 days and administered with 200 μg of a GnRH analogue on day 28, 0.5 mg PGF2α on day 35 and 200 μg of the same GnRH analogue on day 37. TAI was performed at 18 and 24 hr after the second GnRH treatment. Fourteen days after primary immunization, C501 (pVAX-asd-IS) elicited significant immune responses, and anti-inhibin IgG antibody titres in group T1 were significantly higher (p < .01) than groups T3 and C. After the second GnRH treatment, the growth speed of the dominant follicles in group T1 was significantly faster (p < .05) than groups T3 and C. The number and diameter of large follicles (≥10 mm) as well as ovulatory follicles in group T1 were the greatest in all groups, resulting in a greater conception rate in buffaloes with positive anti-inhibin antibodies. These results demonstrate that immunization with the C501 (pVAX-asd-IS) vaccine, coupled with the Ovsynch protocol, could be used as an alternative approach to improve reproductive performance in cross-bred buffaloes.
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Affiliation(s)
- Q Liu
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China
| | - Z U Rehman
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China.,Department of Animal Health, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - J J Liu
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China
| | - L Han
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China
| | - X R Liu
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China
| | - L G Yang
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei, China
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8
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The efficacy of an inhibin DNA vaccine delivered by attenuated Salmonella choleraesuis on follicular development and ovulation responses in crossbred buffaloes. Anim Reprod Sci 2016; 172:76-82. [PMID: 27449408 DOI: 10.1016/j.anireprosci.2016.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/03/2016] [Accepted: 07/12/2016] [Indexed: 11/22/2022]
Abstract
The aim of this study was to evaluate the efficacy of an inhibin DNA vaccine delivered by attenuated Salmonella choleraesuis on follicular development and ovulation responses in crossbred buffaloes. A total of 158 crossbred buffaloes divided into four groups and were intramuscularly injected with 1×10(10) (T1, n=41), 1×10(9) (T2, n=37), 1×10(8) (T3, n=37) or 0 (C, n=43) CFU/ml bacteria delivered inhibin vaccine in 10ml PBS on day 0 and 14, respectively. All animals were administered with 1000 IU PMSG on day 28, 0.5mg PGF2α on day 30 and 200μg GnRH on day 32. The results showed buffaloes immunized with the bacteria delivered inhibin vaccine had significantly higher titers of anti-inhibin IgG antibody than control group (P<0.01). The number and diameter of large follicles (≥10mm) as well as ovulatory follicles in group T1 was significantly greater than group C (P<0.05). The growth speed of dominant follicles in group T1 was significantly faster than groups T3 and C (P<0.05), resulting in a greater conception rate in buffaloes with positive antibodies. These results demonstrate that immunization with the bacterial delivered inhibin vaccine, coupled with the estrus synchronization protocol, could be used as an alternative approach to improve fertility in crossbred buffaloes.
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9
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Effect of inhibin gene immunization on antibody production and reproductive performance in Partridge Shank hens. Theriogenology 2016; 85:1037-44. [DOI: 10.1016/j.theriogenology.2015.11.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 11/14/2015] [Accepted: 11/15/2015] [Indexed: 01/02/2023]
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10
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Dan X, Liu X, Han Y, Liu Q, Yang L. Effect of the novel DNA vaccine fusing inhibin α (1-32) and the RF-amide related peptide-3 genes on immune response, hormone levels and fertility in Tan sheep. Anim Reprod Sci 2016; 164:105-10. [DOI: 10.1016/j.anireprosci.2015.11.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/29/2015] [Accepted: 11/15/2015] [Indexed: 11/24/2022]
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11
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Yan L, Li H, Shi Z. Immunization against inhibin improves in vivo and in vitro embryo production. Anim Reprod Sci 2015; 163:1-9. [DOI: 10.1016/j.anireprosci.2015.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 10/29/2015] [Accepted: 11/01/2015] [Indexed: 01/01/2023]
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Dan X, Han L, Riaz H, Luo X, Liu X, Chong Z, Yang L. Construction and evaluation of the novel DNA vaccine harboring the inhibin α (1-32) and the RF-amide related peptide-3 genes for improving fertility in mice. Exp Anim 2015; 65:17-25. [PMID: 26437787 PMCID: PMC4783647 DOI: 10.1538/expanim.15-0044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
To further improve fertility of animals, a novel gene RFRP-3 (RF-amide
related peptide-3, RFRP-3) was used to construct DNA vaccines with INH
α (1–32) (inhibin, INH) fragment for the first time.
The aim of this study was to evaluate the effects of novel DNA vaccines on fertility in
mice. Synthesized SINH and SRFRP (INH and RFRP genes
were separately ligated to the C-terminus of the small envelope protein of the hepatitis B
virus (HBV-S) gene) fragments were inserted into multiple cloning site of pIRES vector to
develop p-SINH/SRFRP. The synthesized tissue plasminogen activator (TPA) signal sequence
was then inserted into the p-SINH/SRFRP to construct p-TPA-SINH/TPA-SFRFP. Meanwhile,
p-SINH was prepared and considered as positive control. Forty Kunming mice were equally
divided into four groups and respectively immunized by electroporation with p-SINH,
p-SINH/SRFRP and p-TPA-SINH/TPA-SRFRP vaccine (three times at 2 weeks interval) and saline
as control. Results showed that the average antibodies (P/N value) of anti-INH and
anti-RFRP in mice inoculated with p-TPA-SINH/TPA-SFRFP were significantly higher
(P<0.05) than those inoculated with p-SINH/SRFRP and the positive
rates were 100% (anti-INH) and 90% (anti-RFRP) respectively, at 2 weeks after the third
immunization. Litter size of mice immunized with the three recombinant plasmids was higher
(P<0.05) than that of the control, and litter size of mice immunized
with p-TPA-SINH/TPA-SRFRP significantly increased (P<0.05) compared
with p-SINH. These results suggested that the p-TPA-SINH/TPA-SRFRP harboring
INH and RFRP genes was successfully constructed and
had good immunogenicity, and might effectively increase litter size.
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Affiliation(s)
- Xingang Dan
- Key Lab of Education Ministry of China in Agricultural Animal Genetics, Breeding and Reproduction, Huazhong Agricultural University, Wuhan 430070, P.R. China
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13
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M'baye M, Hua G, Khan HA, Yang L. RNAi-mediated knockdown of INHBB increases apoptosis and inhibits steroidogenesis in mouse granulosa cells. J Reprod Dev 2015; 61:391-7. [PMID: 26063610 PMCID: PMC4623144 DOI: 10.1262/jrd.2014-158] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Inhibins are members of the TGFβ superfamily and act as suppressors
of follicle stimulating hormone (FSH) secretion from pituitary glands
via a negative feedback mechanism to regulate folliculogenesis. In
this study, the INHBB gene was knocked down by three
RNAi-Ready pSIREN-RetroQ-ZsGreen vector- mediated recombinant plasmids
to explore the effects of INHBB silencing on
granulosa cell (GC) cell cycle, apoptosis and steroid production
in vitro. Quantitative real-time polymerase chain
reaction, Western blot, flow cytometry and ELISA were performed to
evaluate the role of INHBB in the mouse GC cell
cycle, apoptosis and steroid production in vitro. The
results showed that the relative mRNA and protein expression of
INHBB in mouse GCs can be significantly reduced by
RNAi with pshRNA-B1, pshRNA-B2 and pshRNA-B3 plasmids, with pshRNA-B3
having the best knockdown efficiency. Downregulation of the expression
of INHBB significantly arrests cells in the G1 phase
of the cell cycle and increases the apoptosis rate in GCs. This was
further confirmed by downregulation of the protein expressions of
Cyclin D1, Cyclin E and Bcl2, while the protein expression of Bax was
upregulated. In addition, specific downregulation of
INHBB markedly decreased the concentration of
estradiol and progesterone, which was further validated by the
decrease in the mRNA levels of CYP19A1and
CYP11A1. These findings suggest that inhibin βB is
important in the regulation of apoptosis and cell cycle progression in
granulosa cells. Furthermore, the inhibin βB subunit has a role in the
regulation of steroid hormone biosynthesis. Evidence is accumulating
to support the concept that inhibin βB is physiologically essential
for early folliculogenesis in the mouse.
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Affiliation(s)
- Mohamed M'baye
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, College of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, PR China
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Daghigh Kia H, Asgari Safdar AH. Effects of calcium salts of fatty acids (CSFA) with different profiles (ω3 and ω6) during the flushing period on reproductive performance of ‘Afshari’ ewes. Small Rumin Res 2015. [DOI: 10.1016/j.smallrumres.2015.02.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Cai L, Sun A, Li H, Tsinkgou A, Yu J, Ying S, Chen Z, Shi Z. Molecular mechanisms of enhancing porcine granulosa cell proliferation and function by treatment in vitro with anti-inhibin alpha subunit antibody. Reprod Biol Endocrinol 2015; 13:26. [PMID: 25889399 PMCID: PMC4395973 DOI: 10.1186/s12958-015-0022-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Accepted: 03/24/2015] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND This study was conducted to clarify the effect of the inhibiting action of inhibin on porcine granulosa cell proliferation and function, and to investigate the underlying intracellular regulatory molecular mechanisms. METHODS Porcine granulosa cells were cultured in vitro, and were treated with an anti-inhibin alpha subunit antibody, with or without co-treatment of follicle-stimulating hormone (FSH) in the culture medium. RESULTS Treatment with anti-inhibin alpha subunit antibody led to a significant increase in estradiol (E2) secretion and cell proliferation. Anti-inhibin alpha subunit antibody worked synergistically with FSH at low concentrations (25 microg/mL) to stimulate E2 secretion, but attenuated FSH action at high concentrations (50 microg/mL). Immunoneutralization of inhibin bioactivity increased FOXL2, Smad3, and PKA phosphorylation, and mRNA expression of the transcription factors CEBP and c-FOS. The expression of genes encoding gonadotropin receptors, FSHR and LHR, and of those involved in steroidogenesis, as well as IGFs and IGFBPs, the cell cycle progression factors cyclinD1 and cyclinD2, and the anti-apoptosis and anti-atresia factors Bcl2, TIMP, and ADAMTS were upregulated following anti-inhibin alpha-subunit treatment. Treatment with anti-inhibin alpha subunit down regulated expression of the pro-apoptotic gene encoding caspase3. Although expression of the pro-angiogenesis genes FN1, FGF2, and VEGF was upregulated, expression of the angiogenesis-inhibiting factor THBS1 was downregulated following anti-inhibin alpha subunit treatment. CONCLUSIONS These results suggest that immunoneutralization of inhibin bioactivity, through augmentation of the activin and gonadotropin receptor signaling pathways and regulation of gene expression, permits the development of healthy and viable granulosa cells. These molecular mechanisms help to explain the enhanced ovarian follicular development observed following inhibin immunization in animal models.
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Affiliation(s)
- Liuping Cai
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Aidong Sun
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Hui Li
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Anastasia Tsinkgou
- Department of Life Science, Xijiao-Liverpool University, Suzhou, 215123, China.
| | - Jianning Yu
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Shijia Ying
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Zhe Chen
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
| | - Zhendan Shi
- Laboratory of Animal Breeding and Reproduction, Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
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16
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Computational designing of a poly-epitope fecundity vaccine for multiple species of livestock. Vaccine 2013; 32:11-8. [DOI: 10.1016/j.vaccine.2013.10.086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/19/2013] [Accepted: 10/24/2013] [Indexed: 01/03/2023]
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17
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Han L, Zhen YH, Liang AX, Zhang J, Riaz H, Xiong JJ, Guo AZ, Yang LG. Oral vaccination with inhibin DNA delivered using attenuated Salmonella choleraesuis for improving reproductive traits in mice. J Basic Microbiol 2013; 54:962-8. [PMID: 24123188 DOI: 10.1002/jobm.201300052] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 06/29/2013] [Indexed: 01/11/2023]
Abstract
The objective of this study was to examine the efficacy and safety of a novel inhibin vaccine containing inhibin α (1-32) fragments in mice. A recombinant plasmid pVAX-asd-IS was constructed by inserting recombinant inhibin α (1-32) and the hepatitis B surface antigen S into the plasmid in which the asd gene, rather than the kanamycin gene, was a selection marker. Ninety Kuming mice were divided into six groups consisting of 15 mice each. First group was (C1) injected with 200 µl of PBS, second (C2) received 1 × 10(10) CFU of crp(-) /asd(-) C500/pVAX-asd and served as vector control, third did not receive any treatment (C3), while fourth, fifth, and sixth group received 1 × 10(10) , 1 × 10(9) , 1 × 10(8) CFU of the recombinant inhibin vaccine crp(-) /asd(-) C500/pVAX-asd-IS (group T1, T2, T3), respectively. Western blotting demonstrated that recombinant expressed inhibin protein possessed immune function and that this plasmid could replicate for up to 40 generations stably. Vaccination with this strain at a dose of 1 × 10(10) CFU/200 µl per mouse induced high anti-inhibin antibody levels, significantly increased large-follicle production in T1 group (p < 0.05) and average litter size (p > 0.05) compared with control groups. Integration studies showed no evidence of inhibin fusion gene integrated into mice's genome 2-month after immunization. These results suggest that the vaccine described in the present study may provide a safe method to improve reproductive traits in animals. A trend towards increased litter size and significant increase in large follicle population depict that this vaccine may have direct application in large animal industry.
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Affiliation(s)
- Li Han
- Laboratory of Animal Infectious Diseases, State Key Laboratory of Agricultural Microbiology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China; College of Animal Science and Technology and College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
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18
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Wang SL, Han L, Ahmad S, Cao SX, Xue LQ, Xing ZF, Feng JZ, Liang AX, Yang LG. Effect of a DNA vaccine harboring two copies of inhibin α (1-32) fragments on immune response, hormone concentrations and reproductive performance in rats. Theriogenology 2012; 78:393-401. [PMID: 22592078 DOI: 10.1016/j.theriogenology.2012.02.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 02/18/2012] [Accepted: 02/21/2012] [Indexed: 10/28/2022]
Abstract
The objective was to investigate the effects of a novel DNA vaccine (pcISI) harboring two copies of inhibin α (1-32) fragments on immune response, hormone concentrations and reproductive performance in rats. Female Wistar rats (n=18 per group) were immunized (twice, 4 wk apart) with 10, 50, or 100 μg (T1, T2 and T3, respectively), of the pcISI plasmid. At 4 wk after the second immunization, plasma antibody titers were higher (P<0.05) in T3 than in either T1 or T2 (0.341±0.123, 0.236±0.068, and 0.251±0.077, respectively, mean±SD). Concurrrently, plasma concentrations of FSH and estradiol were highest (P<0.05) in T3, and were higher (P<0.05) in T1 and T2 than in control groups. For antibody-positive rats, there was a correlation (P<0.01) between antibody titer and FSH concentrations after two pcISI immunizations. The number of mature follicles in the T3 group (46.00±4.65) was higher (P<0.05) than in two control groups (29.25±3.72 and 27.92±3.48), and also higher (P<0.05) than in T1 and T2 (37.17±4.99 and 38.75±7.09). Antibody-positive rats had more mature ovarian follicles than negative rats (46.75±4.23 vs. 35.60±3.38, P<0.05). Moreover, litter size and number of placentas were increased (P<0.05) in the pcISI immunization groups, except for the T1 group, compared to the control groups. In conclusion, the pcISI DNA vaccine successfully induced a humoral immune response, improved reproductive hormone concentrations, stimulated follicular development, and increased number of placentas and litter size. Furthermore, 100 μg yielded the best immune response.
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Affiliation(s)
- Shui-Lian Wang
- College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China.
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19
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Daghigh Kia H, Mohamadi Chapdareh W, Hossein Khani A, Moghaddam G, Rashidi A, Sadri H, Alijani S. Effects of flushing and hormonal treatment on reproductive performance of Iranian Markhoz goats. J Anim Physiol Anim Nutr (Berl) 2011; 96:1157-64. [PMID: 21967729 DOI: 10.1111/j.1439-0396.2011.01234.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Forty-eight Iranian Markhoz goats were allocated to six groups (n = 8) to study the effect of flushing and hormonal treatments on reproductive performance. Treatments were divided into two categories including, hormonal treatments and flushing. The goats in each group were fed the same basal ration and received one of the following treatments: Groups A and B--injection of GnRH and equine chorionic gonadotropin (eCG) respectively; Groups C, D and E--a supplement of barley grain, soybean oil and sunflower oil in flushing diets, respectively, were offered and Group F--control (only received basal diet). In the flushing treatments, only the source of energy was different between rations. Both hormonal treatments and flushing treatments improved fertility and kidding rates. Treatment B with 16 and control with seven kids represented the highest and the lowest number of progeny respectively. Among flushing treatments, group C resulted in the highest number of kids being 15. Oestrogen levels in follicular phase increased with the injection of eCG and consumption of barley grain. GnRH injection and consumption of oil sources in the diet increased blood progesterone levels during ovulation and post-ovulation periods. Under current market conditions, using hormone or flushing can be profitable for Markhoz goats farmers.
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Affiliation(s)
- H Daghigh Kia
- Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
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20
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Holtz W, Wang X, El-Gayar M, Knight PG. The effect of exogenous gonadotropins on ovarian function in goats actively immunized against inhibin. Theriogenology 2011; 77:253-9. [PMID: 21924477 DOI: 10.1016/j.theriogenology.2011.07.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 07/03/2011] [Accepted: 07/22/2011] [Indexed: 10/17/2022]
Abstract
The aim of this investigation was to compare the ovarian response to superovulatory treatments in does before and after inhibin immunization, with a view to optimizing the superovulatory potential of the caprine ovary. To avoid interference by the ovarian cycle, the experiment was conducted out-of-season. At the onset of the experiment 48 does were subjected to treatment with an sc implant of the progestogen norgestomet, combined with a gonadotropin; eight does each received a single injection of 1200 IU eCG, 400 IU eCG or 2 mL physiological saline (control) or six injections (at 12 h intervals) constituting 16 or 5.4 AU pFSH. The does were mated and subjected to embryo collection 6 to 7 d later. Throughout the experiment ovarian function (by ultrasonography) and plasma levels of inhibin antibodies and progesterone were monitored. Of 40 does treated during the first part of the experiment, 48% showed estrus. The ovarian response in does treated with a high or low dose of eCG or a low dose of pFSH was barely in excess of the ovarian response in the saline-treated controls, whereas a superovulatory dose of pFSH (16 AU) gave a satisfactory response of, on average, 14.5 ovulations (yielding 8.8 flushed ova and embryos). Immediately after the does had been subjected to embryo collection they were actively immunized against inhibin by administering two injections of a recombinant α-subunit of ovine inhibin at four week intervals. All immunized does produced antibodies with the maximal titer reached two weeks after the second injection. Groups of immunized does were subjected to the same gonadotropin treatments as before (avoiding allocation of individuals to the same treatments). This time all does showed estrous symptoms. The ovulatory response to the various treatments, including the saline controls, was virtually identical, the overall average being 21.8 follicles and 9.1 ovulations. The average embryo yield per doe was 5.7. The results imply that inhibin acted as the key factor in determining the ovulatory response since no impact of any of the supplementary gonadotropins was noted in inhibin-immunized does. This finding gives rise to the notion that inhibin antibodies may act primarily by an intraovarian paracrine action rather than by reducing the suppressive action of inhibin on pituitary FSH release. Further, these findings confirm earlier reports that eCG is less suitable than FSH for inducing superovulation in goats, and indicate that active immunization against inhibin may be considered a viable alternative to using exogenous gonadotropin for inducing superovulation in goats.
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Affiliation(s)
- W Holtz
- Department of Animal Science, Georg-August-University Goettingen, Goettimngen, Germany.
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21
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Tang KQ, Li SJ, Yang WC, Yu JN, Han L, Li X, Yang LG. An MspI polymorphism in the inhibin alpha gene and its associations with superovulation traits in Chinese Holstein cows. Mol Biol Rep 2010; 38:17-21. [PMID: 20238172 DOI: 10.1007/s11033-010-0072-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 03/05/2010] [Indexed: 10/19/2022]
Abstract
To identify a predictor to forecast superovulation response on the basis of associations between superovulation performance and gene polymorphism, the PCR-RFLP method was applied to detect an A>G transition determining an MspI polymorphism at position 192 in the exon I of the bovine inhibin alpha (INHA) gene and evaluate its associations with superovulatory response in 118 Chinese Holstein cows treated for superovulation. Association analysis showed that cows with the GG genotype resulted in a significant increase in the number of ova (TNO) than AG and AA genotypes in the first (P=0.023), second (P=0.004) and third (P=0.002) superovulation treatments and produced more transferable embryos (NTE) than that of AG and AA genotypes in the third (P=0.045) superovulation treatment. Moreover, individuals with GG genotype produced more transferable embryos than AA (P<0.05) genotype in the second superovulation treatment and all cows without superovulation response were mutations with genotypes of AA and AG. These results indicate that INHA gene can be used as a predictor for superovulation in Chinese Holstein cows, and imply that cows with AA genotype should be excluded for superovulation practices.
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Affiliation(s)
- Ke-Qiong Tang
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
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22
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Xian G, Yaojing Y, Shuo J, Xueliang C, Ruilin F, Xingxu Z. Tandem Inhibin Gene Immunization to Induce Sheep Twinning. JOURNAL OF APPLIED ANIMAL RESEARCH 2010. [DOI: 10.1080/09712119.2010.9707101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Naqvi S, Joshi A, Gulyani R, Maurya V, Manik R, Palta P. Active immunization against inhibin-based peptides to increase ovulation rate in non-prolific Malpura ewes. Small Rumin Res 2009. [DOI: 10.1016/j.smallrumres.2008.12.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Wang XL, El-Gayar M, Knight PG, Holtz W. The long-term effect of active immunization against inhibin in goats. Theriogenology 2008; 71:318-22. [PMID: 18762330 DOI: 10.1016/j.theriogenology.2008.07.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Revised: 07/16/2008] [Accepted: 07/25/2008] [Indexed: 10/21/2022]
Abstract
This experiment addresses the long-term effect of active immunization of goats against a recombinant ovine inhibin alpha subunit (roIHN-alpha). In late anestrus 100microg of roINH-alpha was administered to 40 pluriparous Boer goat does, followed, 4 weeks later, by a booster injection. Weekly blood samples were drawn to monitor the inhibin binding capacity with the aid of a radio-tracer binding assay. From the onset until 48h after the end of each estrus, follicular development and ovulation rate were monitored at 24h intervals by transrectal ultrasonography. Beginning in August and continuing into January, does were mated at every other estrus, and submitted to transcervical embryo collection. Seven months after the first immunization, the does were mated again and permitted to carry to term. All immunized does produced inhibin antibodies, an elevated titre being first detected 2 weeks after primary immunization. Maximum titres were reached after 6 weeks, i.e. 2 weeks after the booster injection. Thereafter, in the course of the following 32 weeks, the titre subsided gradually. The does started cycling by mid-August. At that stage the average number of follicles more than 4mm in diameter, ovulations and total embryos and ova recovered were 14.7 (+/-2.3), 5.3 (+/-0.7) and 4.4 (+/-1.0), respectively. A steady decline followed and in January the corresponding means were: 5.2 (+/-0.6) follicles, 3.1 (+/-0.6) ovulations and 1.2 (+/-0.4) embryos and ova recovered. When mated toward the end of the breeding season, 85% of the does became pregnant to the first mating and 73% went to term. Healthy kids were born, the average litter size being 2.2 (+/-0.1). In conclusion, immunization of goats against a recombinant inhibin alpha-subunit proved to be a practicable means of producing embryos for transfer purposes. After about half a year, when the inhibin antibody titre has subsided, it is possible to return the does to the breeding flock without risking complications with normal breeding activity.
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Affiliation(s)
- X L Wang
- Institute of Animal Husbandry and Genetics, University of Goettingen, Albrecht-Thaer-Weg 3, 37075 Goettingen, Germany
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Kandiel MMM, Watanabe G, Li JY, Manabe N, El Azab AESI, Taya K. Physiological roles of inhibin in regulation of FSH secretion and follicular development during early pregnancy in goats. Domest Anim Endocrinol 2008; 35:157-63. [PMID: 18417313 DOI: 10.1016/j.domaniend.2008.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2008] [Revised: 03/01/2008] [Accepted: 03/04/2008] [Indexed: 10/22/2022]
Abstract
The aim of the current study was to clarify the physiological role of inhibin in controlling FSH secretion and follicular development during the early pregnancy in goats. Eight goats investigated sonographically on Days 19-21 (Day 0=day of mating) for pregnancy were assigned into control (n=3) and treated (n=5) groups. The ovaries of all animals were daily scanned with ultrasound for follicles 2mm or more in diameter from 1 day before to 5 days after treatment. On Day 25 postbreeding; animals received either 10 ml, of normal goat serum or antiserum against [Tyr (30)]-inhibin alpha (1-30). Jugular blood samples were collected every 6 h starting 24 h before and until 120 h after treatment. The plasma concentration of FSH increased at 6 h and remained at significantly high levels until 120 h in treated vs. control group. The plasma concentrations of estradiol showed a marked increased at 66 h, with peak levels at 120 h after treatment of antiserum. The basal concentrations of LH and the pattern of plasma concentrations of progesterone were not significantly different between the two groups. The number of medium size (3.5-5.0 mm) follicles increased considerably from Day 2, whereas small (3.5 mm or less) and large (5 mm or more) follicles increased noticeably from Day 3, as compared with pre-treatment and controls. These results clearly indicated that inhibin is a key hormone in regulation of follicular development through regulation of endogenous FSH secretion during early pregnancy in goats.
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Affiliation(s)
- Mohamed M M Kandiel
- Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, Japan
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26
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Padilla G, Knight P, Holtz W. Superovulation and embryo collection in nulliparous Boer goat does immunized against a recombinant ovine α-subunit inhibin. Small Rumin Res 2008. [DOI: 10.1016/j.smallrumres.2007.05.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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27
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Development and evaluation of a novel DNA vaccine expressing inhibin alpha (1-32) fragment for improving the fertility in rats and sheep. Anim Reprod Sci 2007; 109:251-65. [PMID: 18243599 DOI: 10.1016/j.anireprosci.2007.12.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 12/11/2007] [Accepted: 12/12/2007] [Indexed: 11/23/2022]
Abstract
Inhibin is an important protein hormone in regulating folliculogenesis. Immunization against inhibin can improve follicle developments. The objective of present study is to investigate inhibin DNA immunization as a potential tool for improving follicle development and litter sizes of female animals. In our study, the inhibin DNA vaccine was constructed with inhibin alpha (1-32) fragment inserted into the C termination of HBsAg-S. Ninety rats and forty sheep were immunized with inhibin DNA vaccine. In rats, immunization against inhibin resulted in increase of positive sera ratio (P<0.01). The treatment was accompanied by a significant increase in the total number of mature follicles of >0.8mm in diameter on the onset of estrous cycle after twice immunization (31.0+/-3.9 in the test groups versus 27.4+/-5 in control groups) and after third immunization (35.2+/-6.7 in the test groups versus 30.3+/-5.2 in control groups). Litter sizes were significantly (P<0.05) bigger in rats treated with inhibin DNA vaccine (12.7+/-4.5 n=6) than in control (9.8+/-4.5). In sheep, twinning rate in test groups (39.2%) was significantly higher than that in control groups (10%) after immunization (P<0.05). These results indicated that inhibin was an important factor in improvement of fertility in rats and sheep, and demonstrated that DNA immunization against inhibin could induce more mature follicles resulting in increased litter sizes. Our results revealed that inhibin DNA vaccine may be an alternative to the use of exogenous gonadotrophins for increasing ovarian follicular development and improving animal fertility.
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Meng C, Shi F, Zhou Z, Huang R, Liu G, Watanabe G, Taya K. Cellular Localization of Inhibin alpha-subunit, PKB/Akt and FoxO3a proteins in the ovaries of minipigs. J Reprod Dev 2006; 53:229-36. [PMID: 17132910 DOI: 10.1262/jrd.18078] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Experiments were conducted to examine the cellular localization of inhibin alpha-subunit, protein kinase B (PKB/Akt), and FoxO3a proteins in the ovaries of minipigs, Chinese Xiang pigs, by immunohistochemistry. The results indicated that inhibin alpha-subunits were localized in the granulosa cells of follicles at all stages but were not localized in corpora lutea. PKB was localized in the granulosa cells of primordial follicles and in the basal layers of the granulosa cells of preantral and antral follicles, but were not localized in atretic follicles and corpora lutea. FoxO3a was localized in the granulosa cells of follicles at all stages and was extensively localized in the cytoplasma of the luteinized granulosa cells of corpora lutea. Together, the stage- and cell-specific expression patterns of inhibin alpha-subunit, FoxO3a, and PKB suggest that these proteins might play potential roles in follicular development, atresia, and luteinization in the minipig.
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Affiliation(s)
- Chunhua Meng
- Laboratory of Animal Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, PR China
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