1
|
Sitruk-Ware R, Soule L, Jarow JP, Odlind V. Regulatory challenges of new male contraceptive methods. Andrology 2024. [PMID: 39092874 DOI: 10.1111/andr.13720] [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: 02/13/2024] [Revised: 06/26/2024] [Accepted: 07/19/2024] [Indexed: 08/04/2024]
Abstract
INTRODUCTION Progress in male contraception development faces the challenge of a lack of regulatory precedent and guidelines on the evidence (trial design and primary endpoint) required for marketing approval. Moreover, the development of a male contraceptive is complicated by the fact that the clinical treatment effect; prevention of pregnancy, is not measured in the patient receiving the intervention. DISCUSSION Regulatory precedent and guidelines exist for female hormonal contraceptives but their applicability to male contraceptive products likely varies based on the mode of action and the anticipated pharmacodynamic effects of the product. The unique attributes of male contraceptives, including the frequent delay between the intervention (e.g., vasectomy and hormonal methods) and ultimate contraceptive effect, sperm suppression near azoospermia, and pregnancy prevention need to be addressed. CONCLUSION This article describes the regulatory challenges faced by developers of male contraceptive products and offers proposals, paving the way for the development of both hormonal methods and non-hormonal approaches. Our article intends to suggest the directions but cannot substitute for the advice of regulatory agencies.
Collapse
Affiliation(s)
- Regine Sitruk-Ware
- Center for Biomedical Research, Population Council, New York, New York, USA
| | | | | | | |
Collapse
|
2
|
Harter TS, Smith EA, Salmerón C, Thies AB, Delgado B, Wilson RW, Tresguerres M. Soluble adenylyl cyclase is an acid-base sensor in rainbow trout red blood cells that regulates intracellular pH and haemoglobin-oxygen binding. Acta Physiol (Oxf) 2024:e14205. [PMID: 39031444 DOI: 10.1111/apha.14205] [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: 02/12/2024] [Revised: 06/12/2024] [Accepted: 07/04/2024] [Indexed: 07/22/2024]
Abstract
AIM To identify the physiological role of the acid-base sensing enzyme, soluble adenylyl cyclase (sAC), in red blood cells (RBC) of the model teleost fish, rainbow trout. METHODS We used: (i) super-resolution microscopy to determine the subcellular location of sAC protein; (ii) live-cell imaging of RBC intracellular pH (pHi) with specific sAC inhibition (KH7 or LRE1) to determine its role in cellular acid-base regulation; (iii) spectrophotometric measurements of haemoglobin-oxygen (Hb-O2) binding in steady-state conditions; and (iv) during simulated arterial-venous transit, to determine the role of sAC in systemic O2 transport. RESULTS Distinct pools of sAC protein were detected in the RBC cytoplasm, at the plasma membrane and within the nucleus. Inhibition of sAC decreased the setpoint for RBC pHi regulation by ~0.25 pH units compared to controls, and slowed the rates of RBC pHi recovery after an acid-base disturbance. RBC pHi recovery was entirely through the anion exchanger (AE) that was in part regulated by HCO3 --dependent sAC signaling. Inhibition of sAC decreased Hb-O2 affinity during a respiratory acidosis compared to controls and reduced the cooperativity of O2 binding. During in vitro simulations of arterial-venous transit, sAC inhibition decreased the amount of O2 that is unloaded by ~11%. CONCLUSION sAC represents a novel acid-base sensor in the RBCs of rainbow trout, where it participates in the modulation of RBC pHi and blood O2 transport though the regulation of AE activity. If substantiated in other species, these findings may have broad implications for our understanding of cardiovascular physiology in vertebrates.
Collapse
Affiliation(s)
- Till S Harter
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| | - Emma A Smith
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| | - Cristina Salmerón
- Department of Pharmacology, University of California San Diego, La Jolla, California, USA
| | - Angus B Thies
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| | - Bryan Delgado
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| | - Rod W Wilson
- Biosciences Department, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Martin Tresguerres
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| |
Collapse
|
3
|
Kim J, So B, Heo Y, So H, Jo JK. Advances in Male Contraception: When Will the Novel Male Contraception be Available? World J Mens Health 2024; 42:487-501. [PMID: 38164023 PMCID: PMC11216971 DOI: 10.5534/wjmh.230118] [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: 04/28/2023] [Revised: 07/18/2023] [Accepted: 07/26/2023] [Indexed: 01/03/2024] Open
Abstract
Many contraceptive methods have been developed over the years due to high demand. However, female contraceptive pills and devices do not work for all females due to health conditions and side effects. Also, the number of males who want to actively participate in family planning is gradually increasing. However, the only contraceptive options currently available to males are condoms and vasectomy. Therefore, many male contraceptive methods, including medication (hormonal and non-hormonal therapy) and mechanical methods, are under development. Reversibility, safety, persistence, degree of invasion, promptness, and the suppression of anti-sperm antibody formation are essential factors in the development of male contraceptive methods. In this paper, male contraceptive methods under development are reviewed according to those essential factors. Furthermore, the timeline for the availability of a new male contraception is discussed.
Collapse
Affiliation(s)
- Jongwon Kim
- Department of Medical and Digital Engineering, Hanyang University, Seoul, Korea
| | - Byeongchan So
- Department of Medical and Digital Engineering, Hanyang University, Seoul, Korea
| | - Yongki Heo
- Department of Medical and Digital Engineering, Hanyang University, Seoul, Korea
| | - Hongyun So
- Department of Medical and Digital Engineering, Hanyang University, Seoul, Korea
- Institute of Nano Science and Technology, Hanyang University, Seoul, Korea
- Department of Mechanical Engineering, Hanyang University, Seoul, Korea.
| | - Jung Ki Jo
- Department of Medical and Digital Engineering, Hanyang University, Seoul, Korea
- Department of Urology, College of Medicine, Hanyang University, Seoul, Korea.
| |
Collapse
|
4
|
Cao Y, Tian GG, Hong X, Lu Q, Wei T, Chen HF, Wu J. Reproductive chemical database: a curated database of chemicals that modulate protein targets regulating important reproductive biological processes. Cell Biosci 2024; 14:73. [PMID: 38845051 PMCID: PMC11157792 DOI: 10.1186/s13578-024-01261-1] [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: 12/04/2023] [Accepted: 05/31/2024] [Indexed: 06/09/2024] Open
Abstract
Recent studies have shifted the spotlight from adult disease to gametogenesis and embryo developmental events, and these are greatly affected by various environmental chemicals, such as drugs, metabolites, pollutants, and others. Growing research has highlighted the critical importance of identifying and understanding the roles of chemicals in reproductive biology. However, the functions and mechanisms of chemicals in reproductive processes remain incomplete. We developed a comprehensive database called the Reproductive Chemical Database (RCDB) ( https://yu.life.sjtu.edu.cn/ChenLab/RCDB ) to facilitate research on chemicals in reproductive biology. This resource is founded on rigorous manual literature extraction and precise protein target prediction methodologies. This database focuses on the delineation of chemicals associated with phenotypes, diseases, or endpoints intricately associated with four important reproductive processes: female and male gamete generation, fertilization, and embryo development in human and mouse. The RCDB encompasses 93 sub-GO processes, and it revealed 1447 intricate chemical-biological process interactions. To date, the RCDB has meticulously cataloged and annotated 830 distinct chemicals, while also predicting 614 target proteins from a selection of 3800 potential candidates. Additionally, the RCDB offers an online predictive tool that empowers researchers to ascertain whether specific chemicals play discernible functional roles in these reproductive processes. The RCDB is an exhaustive, cross-platform, manually curated database, which provides a user-friendly interface to search, browse, and use reproductive processes modulators and their comprehensive related information. The RCDB will help researchers to understand the whole reproductive process and related diseases and it has the potential to promote reproduction research in the pharmacological and pathophysiological areas.
Collapse
Affiliation(s)
- Yuedi Cao
- Key Laboratory for the Genetics of Development & Neuropsychiatric Disorders (Ministry of Education), Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Geng G Tian
- Key Laboratory for the Genetics of Development & Neuropsychiatric Disorders (Ministry of Education), Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, 200240, China
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xiaokun Hong
- State Key Laboratory of Microbial Metabolism and Joint International Research Laboratory of Metabolic & Developmental Sciences, National Experimental Teaching Center for Life Sciences and Biotechnology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Qing Lu
- Key Laboratory for the Genetics of Development & Neuropsychiatric Disorders (Ministry of Education), Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Ting Wei
- State Key Laboratory of Microbial Metabolism and Joint International Research Laboratory of Metabolic & Developmental Sciences, National Experimental Teaching Center for Life Sciences and Biotechnology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Hai-Feng Chen
- State Key Laboratory of Microbial Metabolism and Joint International Research Laboratory of Metabolic & Developmental Sciences, National Experimental Teaching Center for Life Sciences and Biotechnology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Ji Wu
- Key Laboratory for the Genetics of Development & Neuropsychiatric Disorders (Ministry of Education), Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, 200240, China.
- Key Laboratory of Fertility Preservation and Maintenance of Ministry of Education, Ningxia Medical University, Yinchuan, 750004, China.
| |
Collapse
|
5
|
Deshpande A, Varghese R, Pal K. On-demand male contraceptives: gazing at the long road ahead. Int J Impot Res 2024; 36:450-451. [PMID: 37165198 DOI: 10.1038/s41443-023-00707-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 04/17/2023] [Accepted: 04/19/2023] [Indexed: 05/12/2023]
Affiliation(s)
- Abha Deshpande
- Poona College of Pharmacy, Bharati Vidyapeeth (Deemed to be) University, Pune, Maharashtra, 411038, India
| | - Ryan Varghese
- Poona College of Pharmacy, Bharati Vidyapeeth (Deemed to be) University, Pune, Maharashtra, 411038, India
- Department of Clinical Pharmacology, Advanced Centre for Treatment, Research, and Education in Cancer, Tata Memorial Centre, Kharghar, Navi Mumbai, Maharashtra, 410210, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, Maharashtra, 400094, India
| | - Kavita Pal
- Department of Clinical Pharmacology, Advanced Centre for Treatment, Research, and Education in Cancer, Tata Memorial Centre, Kharghar, Navi Mumbai, Maharashtra, 410210, India.
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai, Maharashtra, 400094, India.
| |
Collapse
|
6
|
Sanchez NDRR, Ritagliati C, Kopf GS, Kretschmer S, Buck J, Levin LR. The uniqueness of on-demand male contraception. Mol Aspects Med 2024; 97:101281. [PMID: 38805792 PMCID: PMC11167369 DOI: 10.1016/j.mam.2024.101281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Accepted: 05/21/2024] [Indexed: 05/30/2024]
Abstract
Because nearly half of pregnancies worldwide are unintended, available contraceptive methods are inadequate. Moreover, due to the striking imbalance between contraceptive options available for men compared to the myriad of options available to women, there is an urgent need for new methods of contraception for men. This review summarizes ongoing efforts to develop male contraceptives highlighting the unique aspects particular to on-demand male contraception, where a man takes a contraceptive only when and as often as needed.
Collapse
Affiliation(s)
| | - Carla Ritagliati
- Department of Pharmacology, Weill Cornell Medicine, New York, NY, USA
| | | | | | - Jochen Buck
- Department of Pharmacology, Weill Cornell Medicine, New York, NY, USA.
| | - Lonny R Levin
- Department of Pharmacology, Weill Cornell Medicine, New York, NY, USA
| |
Collapse
|
7
|
Ku AF, Sharma KL, Ta HM, Sutton CM, Bohren KM, Wang Y, Chamakuri S, Chen R, Hakenjos JM, Jimmidi R, Kent K, Li F, Li JY, Ma L, Madasu C, Palaniappan M, Palmer SS, Qin X, Robers MB, Sankaran B, Tan Z, Vasquez YM, Wang J, Wilkinson J, Yu Z, Ye Q, Young DW, Teng M, Kim C, Matzuk MM. Reversible male contraception by targeted inhibition of serine/threonine kinase 33. Science 2024; 384:885-890. [PMID: 38781365 DOI: 10.1126/science.adl2688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 04/03/2024] [Indexed: 05/25/2024]
Abstract
Men or mice with homozygous serine/threonine kinase 33 (STK33) mutations are sterile owing to defective sperm morphology and motility. To chemically evaluate STK33 for male contraception with STK33-specific inhibitors, we screened our multibillion-compound collection of DNA-encoded chemical libraries, uncovered potent STK33-specific inhibitors, determined the STK33 kinase domain structure bound with a truncated hit CDD-2211, and generated an optimized hit CDD-2807 that demonstrates nanomolar cellular potency (half-maximal inhibitory concentration = 9.2 nanomolar) and favorable metabolic stability. In mice, CDD-2807 exhibited no toxicity, efficiently crossed the blood-testis barrier, did not accumulate in brain, and induced a reversible contraceptive effect that phenocopied genetic STK33 perturbations without altering testis size. Thus, STK33 is a chemically validated, nonhormonal contraceptive target, and CDD-2807 is an effective tool compound.
Collapse
Affiliation(s)
- Angela F Ku
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Kiran L Sharma
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Hai Minh Ta
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Courtney M Sutton
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Kurt M Bohren
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Yong Wang
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Srinivas Chamakuri
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ruihong Chen
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - John M Hakenjos
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ravikumar Jimmidi
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Katarzyna Kent
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Feng Li
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jian-Yuan Li
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lang Ma
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Chandrashekhar Madasu
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Murugesan Palaniappan
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Stephen S Palmer
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Xuan Qin
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Banumathi Sankaran
- Molecular Biophysics and Integrated Bioimaging, Berkeley Center for Structural Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Zhi Tan
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Yasmin M Vasquez
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jian Wang
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Zhifeng Yu
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Qiuji Ye
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Damian W Young
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Mingxing Teng
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Choel Kim
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Martin M Matzuk
- Center for Drug Discovery, Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| |
Collapse
|
8
|
Holdaway J, Georg GI. An emerging target for male contraception. Science 2024; 384:849-850. [PMID: 38781397 DOI: 10.1126/science.adp6432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
An inhibitor of a nonhormonal target is identified using a DNA-encoded chemical library.
Collapse
Affiliation(s)
| | - Gunda I Georg
- University of Minnesota Twin Cities, Minneapolis, MN, USA
| |
Collapse
|
9
|
Lee KH, Hwang JY. Ca 2+ homeostasis and male fertility: a target for a new male contraceptive system. Anim Cells Syst (Seoul) 2024; 28:171-183. [PMID: 38686363 PMCID: PMC11057403 DOI: 10.1080/19768354.2024.2345647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 04/16/2024] [Indexed: 05/02/2024] Open
Abstract
Ca2+ is a key secondary messenger that determines sperm motility patterns. Mammalian sperm undergo capacitation, a process to acquire fertilizing ability, in the female reproductive tract. Capacitated sperm change their flagellar waveform to develop hyperactivated motility, which is crucial for successful sperm navigation to the eggs and fertilization. The sperm-specific channel, CATSPER, and an ATPase transporter, PMCA4, serve as major paths for Ca2+ influx and efflux, respectively, in sperm. The ionic paths coordinate Ca2+ homeostasis in the sperm, and their loss-of-function impairs sperm motility, to cause male infertility. In this review, we summarize the physiological significance of these two Ca2+ gates and suggest their potential applications in novel male contraceptives.
Collapse
Affiliation(s)
- Kyung-Ha Lee
- Department of Molecular Biology, Pusan National University, Busan, South Korea
- Institute of Systems Biology, Pusan National University, Busan, South Korea
| | - Jae Yeon Hwang
- Department of Molecular Biology, Pusan National University, Busan, South Korea
- Institute of Systems Biology, Pusan National University, Busan, South Korea
| |
Collapse
|
10
|
Koilpillai JN, Nunan E, Butler L, Pinaffi F, Butcher JT. Reversible Contraception in Males: An Obtainable Target? BIOLOGY 2024; 13:291. [PMID: 38785772 PMCID: PMC11117788 DOI: 10.3390/biology13050291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/27/2024] [Accepted: 04/13/2024] [Indexed: 05/25/2024]
Abstract
The last few decades have brought contraception to the forefront of research, with great strides made in effectively targeting and optimizing the physiology, pharmacology, and delivery processes that prevent pregnancy. However, these advances still predominantly target female contraceptives for the prevention of contraception, whereas targeting the male sex has lagged far behind. This has led to a marked deficiency in safe and effective male contraceptive agents, resulting in a heavy dependence on female contraceptives to prevent unwanted and unplanned pregnancies. Current research in the veterinary field and in rodents highlights several promising avenues whereby novel, safe, and effective male contraceptive alternatives are being developed-with an emphasis on reduced side effects and reversibility potential. This review aims to discuss current and novel male contraceptives (both human and veterinary formulations) while highlighting their efficacy, advantages, and disadvantages.
Collapse
Affiliation(s)
- Joanna Nandita Koilpillai
- Comparative Biomedical Sciences Graduate Program, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA
| | - Emily Nunan
- Comparative Biomedical Sciences Graduate Program, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA
| | - Landon Butler
- Department of Integrative Biology, Oklahoma State University, Stillwater, OK 74078, USA
| | - Fabio Pinaffi
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA
| | - Joshua T. Butcher
- Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA
| |
Collapse
|
11
|
De Jonge CJ, Barratt CLR, Aitken RJ, Anderson RA, Baker P, Chan DYL, Connolly MP, Eisenberg ML, Garrido N, Jørgensen N, Kimmins S, Krausz C, McLachlan RI, Niederberger C, O’Bryan MK, Pacey A, Priskorn L, Rautakallio-Hokkanen S, Serour G, Veltman JA, Vogel DL, Vazquez-Levin MH. Current global status of male reproductive health. Hum Reprod Open 2024; 2024:hoae017. [PMID: 38699533 PMCID: PMC11065475 DOI: 10.1093/hropen/hoae017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 02/22/2024] [Indexed: 05/05/2024] Open
Abstract
BACKGROUND The widespread interest in male reproductive health (MRH), fueled by emerging evidence, such as the global decline in sperm counts, has intensified concerns about the status of MRH. Consequently, there is a pressing requirement for a strategic, systematic approach to identifying critical questions, collecting pertinent information, and utilizing these data to develop evidence-based strategies. The methods for addressing these questions and the pathways toward their answers will inevitably vary based on the variations in cultural, geopolitical, and health-related contexts. To address these issues, a conjoint ESHRE and Male Reproductive Health Initiative (MRHI) Campus workshop was convened. OBJECTIVE AND RATIONALE The three objectives were: first, to assess the current state of MRH around the world; second, to identify some of the key gaps in knowledge; and, third, to examine how MRH stakeholders can collaboratively generate intelligent and effective paths forward. SEARCH METHODS Each expert reviewed and summarized the current literature that was subsequently used to provide a comprehensive overview of challenges related to MRH. OUTCOMES This narrative report is an overview of the data, opinions, and arguments presented during the workshop. A number of outcomes are presented and can be summarized by the following overarching themes: MRH is a serious global issue and there is a plethora of gaps in our understanding; there is a need for widespread international collaborative networks to undertake multidisciplinary research into fundamental issues, such as lifestyle/environmental exposure studies, and high-quality clinical trials; and there is an urgent requirement for effective strategies to educate young people and the general public to safeguard and improve MRH across diverse population demographics and resources. LIMITATIONS REASONS FOR CAUTION This was a workshop where worldwide leading experts from a wide range of disciplines presented and discussed the evidence regarding challenges related to MRH. While each expert summarized the current literature and placed it in context, the data in a number of areas are limited and/or sparse. Equally, important areas for consideration may have been missed. Moreover, there are clear gaps in our knowledge base, which makes some conclusions necessarily speculative and warranting of further study. WIDER IMPLICATIONS Poor MRH is a global issue that suffers from low awareness among the public, patients, and heathcare professionals. Addressing this will require a coordinated multidisciplinary approach. Addressing the significant number of knowledge gaps will require policy makers prioritizing MRH and its funding. STUDY FUNDING/COMPETING INTERESTS The authors would like to extend their gratitude to ESHRE for providing financial support for the Budapest Campus Workshop, as well as to Microptic S.L. (Barcelona) for kindly sponsoring the workshop. P.B. is the Director of the not-for-profit organization Global Action on Men's Health and receives fees and expenses for his work, (which includes the preparation of this manuscript). Conflicts of interest: C.J.D.J., C.L.R.B., R.A.A., P.B., M.P.C., M.L.E., N.G., N.J., C.K., AAP, M.K.O., S.R.-H., M.H.V.-L.: ESHRE Campus Workshop 2022 (Travel support-personal). C.J.D.J.: Cambridge University Press (book royalties-personal). ESHRE Annual Meeting 2022 and Yale University Panel Meeting 2023 (Travel support-personal). C.L.R.B.: Ferring and IBSA (Lecture), RBMO editor (Honorarium to support travel, etc.), ExSeed and ExScentia (University of Dundee), Bill & Melinda Gates Foundation (for research on contraception). M.P.C.: Previously received funding from pharmaceutical companies for health economic research. The funding was not in relation to this work and had no bearing on the contents of this work. No funding from other sources has been provided in relation to this work (funding was provided to his company Global Market Access Solutions). M.L.E.: Advisor to Ro, Doveras, Next, Hannah, Sandstone. C.K.: European Academy of Andrology (Past president UNPAID), S.K.: CEO of His Turn, a male fertility Diagnostic and Therapeutic company (No payments or profits to date). R.I.M.: www.healthymale.org.au (Australian Government funded not for profit in men's health sector (Employed as Medical Director 0.2 FET), Monash IVF Pty Ltd (Equity holder)). N.J.: Merck (consulting fees), Gedeon Richter (honoraria). S.R.-H.: ESHRE (Travel reimbursements). C.N.: LLC (Nursing educator); COMMIT (Core Outcomes Measures for Infertility Trials) Advisor, meeting attendee, and co-author; COMMA (Core Outcomes in Menopause) Meeting attendee, and co-author; International Federation of Gynecology and Obstetrics (FIGO) Delegate Letters and Sciences; ReproNovo, Advisory board; American Board of Urology Examiner; American Urological Association Journal subsection editor, committee member, guidelines co-author Ferring Scientific trial NexHand Chief Technology Officer, stock ownership Posterity Health Board member, stock ownership. A.P.: Economic and Social Research Council (A collaborator on research grant number ES/W001381/1). Member of an advisory committee for Merck Serono (November 2022), Member of an advisory board for Exceed Health, Speaker fees for educational events organized by Mealis Group; Chairman of the Cryos External Scientific Advisory Committee: All fees associated with this are paid to his former employer The University of Sheffield. Trustee of the Progress Educational Trust (Unpaid). M.K.O.: National Health and Medical Research Council and Australian Research Council (Funding for research of the topic of male fertility), Bill and Melinda Gates Foundation (Funding aimed at the development of male gamete-based contraception), Medical Research Future Fund (Funding aimed at defining the long-term consequences of male infertility). M.H.V.-L.: Department of Sexual and Reproductive Health and Research (SRH)/Human Reproduction Programme (HRP) Research Project Panel RP2/WHO Review Member; MRHI (Core Group Member), COMMIT (member), EGOI (Member); Human Reproduction (Associate Editor), Fertility and Sterility (Editor), AndroLATAM (Founder and Coordinator).
Collapse
Affiliation(s)
- Christopher J De Jonge
- Department of Urology, University of Minnesota Medical Center, University of Minnesota, Minneapolis, MN, USA
| | - Christopher L R Barratt
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK
| | - R John Aitken
- Discipline of Biological Sciences, School of Environment and Life Sciences, College of Engineering, Science and Environment, University of Newcastle, Newcastle, Australia
| | - Richard A Anderson
- MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh, UK
| | | | - David Y L Chan
- Assisted Reproductive Technology Unit, Department of Obstetrics and Gynaecology, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, China
| | - Mark P Connolly
- Health Economics, Global Market Access Solutions LLC, Mooresville, NC, USA
- University Medical Center Groningen, Groningen, The Netherlands
| | - Michael L Eisenberg
- Department of Urology and Obstetrics & Gynecology, Stanford University, Stanford, CA, USA
| | - Nicolas Garrido
- IVIRMA Global Research Alliance, IVI Foundation, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Niels Jørgensen
- Department of Growth and Reproduction and International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Sarah Kimmins
- Department of Pharmacology and Therapeutics, Faculty of Medicine, McGill University, Montreal, QC, Canada
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal, Montréal, QC, Canada
- Département de Pathologie et Biologie Cellulaire, Université de Montréal, Montréal, QC, Canada
| | - Csilla Krausz
- Department of Experimental and Clinical Biomedical Sciences, ‘Mario Serio’, University of Florence, University Hospital of Careggi (AOUC), Florence, Italy
| | - Robert I McLachlan
- Hudson Institute of Medical Research, Monash University, Melbourne, Australia
- Monash IVF Group, Cremorne, Australia
| | - Craig Niederberger
- Clarence C. Department of Urology, University of Illinois Chicago (UIC), College of Medicine, Department of Bioengineering, UIC College of Engineering, Chicago, IL,USA
| | - Moira K O’Bryan
- School of BioSciences and Bio21 Institute, The University of Melbourne, Parkville, Australia
| | - Allan Pacey
- Faculty of Biology, Medicine and Health, Core Technology Facility, University of Manchester, Manchester, UK
| | - Lærke Priskorn
- Department of Growth and Reproduction and International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Gamal Serour
- The International Islamic Center for Population Studies and Research, Al-Azhar University, Maadi, Cairo, Egypt
- Egyptian IVF Center, Maadi, Cairo, Egypt
| | - Joris A Veltman
- Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Donna L Vogel
- School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Mónica H Vazquez-Levin
- Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina—Fundación IBYME, Buenos Aires, Argentina
| |
Collapse
|
12
|
Li HL, Verhoeven A, Elferink RO. The role of soluble adenylyl cyclase in sensing and regulating intracellular pH. Pflugers Arch 2024; 476:457-465. [PMID: 38581526 PMCID: PMC11006738 DOI: 10.1007/s00424-024-02952-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 04/08/2024]
Abstract
Soluble adenylyl cyclase (sAC) differs from transmembrane adenylyl cyclases (tmAC) in many aspects. In particular, the activity of sAC is not regulated by G-proteins but by the prevailing bicarbonate concentrations inside cells. Therefore, sAC serves as an exquisite intracellular pH sensor, with the capacity to translate pH changes into the regulation of localization and/or activity of cellular proteins involved in pH homeostasis. In this review, we provide an overview of literature describing the regulation of sAC activity by bicarbonate, pinpointing the importance of compartmentalization of intracellular cAMP signaling cascades. In addition, examples of processes involving proton and bicarbonate transport in different cell types, in which sAC plays an important regulatory role, were described in detail.
Collapse
Affiliation(s)
- Hang Lam Li
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, Meibergdreef 69-71, 1105BK, Amsterdam, the Netherlands
| | - Arthur Verhoeven
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, Meibergdreef 69-71, 1105BK, Amsterdam, the Netherlands
| | - Ronald Oude Elferink
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, Meibergdreef 69-71, 1105BK, Amsterdam, the Netherlands.
| |
Collapse
|
13
|
Chandra Jena B, Flaherty DP, O'Brien VP, Watts VJ. Biochemical pharmacology of adenylyl cyclases in cancer. Biochem Pharmacol 2024:116160. [PMID: 38522554 DOI: 10.1016/j.bcp.2024.116160] [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: 01/20/2024] [Revised: 03/11/2024] [Accepted: 03/21/2024] [Indexed: 03/26/2024]
Abstract
Globally, despite extensive research and pharmacological advancement, cancer remains one of the most common causes of mortality. Understanding the signaling pathways involved in cancer progression is essential for the discovery of new drug targets. The adenylyl cyclase (AC) superfamily comprises glycoproteins that regulate intracellular signaling and convert ATP into cyclic AMP, an important second messenger. The present review highlights the involvement of ACs in cancer progression and suppression, broken down for each specific mammalian AC isoform. The precise mechanisms by which ACs contribute to cancer cell proliferation and invasion are not well understood and are variable among cancer types; however, AC overactivation, along with that of downstream regulators, presents a potential target for novel anticancer therapies. The expression patterns of ACs in numerous cancers are discussed. In addition, we highlight inhibitors of AC-related signaling that are currently under investigation, with a focus on possible anti-cancer strategies. Recent discoveries with small molecules regarding more direct modulation AC activity are also discussed in detail. A more comprehensive understanding of different components in AC-related signaling could potentially lead to the development of novel therapeutic strategies for personalized oncology and might enhance the efficacy of chemoimmunotherapy in the treatment of various cancers.
Collapse
Affiliation(s)
- Bikash Chandra Jena
- Borch Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA
| | - Daniel P Flaherty
- Borch Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA
| | - Valerie P O'Brien
- Borch Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA.
| | - Val J Watts
- Borch Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA.
| |
Collapse
|
14
|
Mohanty G, Sanchez-Cardenas C, Paudel B, Tourzani DA, Salicioni AM, Santi CM, Gervasi MG, Pilsner JR, Darszon A, Visconti PE. Differential role of bovine serum albumin and HCO3- in the regulation of GSK3 alpha during mouse sperm capacitation. Mol Hum Reprod 2024; 30:gaae007. [PMID: 38341666 PMCID: PMC10914453 DOI: 10.1093/molehr/gaae007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/25/2024] [Indexed: 02/12/2024] Open
Abstract
To become fertile, mammalian sperm are required to undergo capacitation in the female tract or in vitro in defined media containing ions (e.g. HCO3 -, Ca2+, Na+, and Cl-), energy sources (e.g. glucose, pyruvate) and serum albumin (e.g. bovine serum albumin (BSA)). These different molecules initiate sequential and concomitant signaling pathways, leading to capacitation. Physiologically, capacitation induces changes in the sperm motility pattern (e.g. hyperactivation) and prepares sperm for the acrosomal reaction (AR), two events required for fertilization. Molecularly, HCO3 - activates the atypical adenylyl cyclase Adcy10 (aka sAC), increasing cAMP and downstream cAMP-dependent pathways. BSA, on the other hand, induces sperm cholesterol release as well as other signaling pathways. How these signaling events, occurring in different sperm compartments and with different kinetics, coordinate among themselves is not well established. Regarding the AR, recent work has proposed a role for glycogen synthase kinases (GSK3α and GSK3β). GSK3α and GSK3β are inactivated by phosphorylation of residues Ser21 and Ser9, respectively, in their N-terminal domain. Here, we present evidence that GSK3α (but not GSK3β) is present in the anterior head and that it is regulated during capacitation. Interestingly, BSA and HCO3 - regulate GSK3α in opposite directions. While BSA induces a fast GSK3α Ser21 phosphorylation, HCO3 - and cAMP-dependent pathways dephosphorylate this residue. We also show that the HCO3--induced Ser21 dephosphorylation is mediated by hyperpolarization of the sperm plasma membrane potential (Em) and by intracellular pH alkalinization. Previous reports indicate that GSK3 kinases mediate the progesterone-induced AR. Here, we show that GSK3 inhibition also blocks the Ca2+ ionophore ionomycin-induced AR, suggesting a role for GSK3 kinases downstream of the increase in intracellular Ca2+ needed for this exocytotic event. Altogether, our data indicate a temporal and biphasic GSK3α regulation with opposite actions of BSA and HCO3 -. Our results also suggest that this regulation is needed to orchestrate the AR during sperm capacitation.
Collapse
Affiliation(s)
- Gayatri Mohanty
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Claudia Sanchez-Cardenas
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, UNAM, Cuernavaca, México
| | - Bidur Paudel
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Darya A Tourzani
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Ana M Salicioni
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Celia M Santi
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St Louis, MO, USA
| | - María G Gervasi
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
- Department of Animal Science, University of Connecticut, Storrs, CT, USA
| | - J Richard Pilsner
- C.S. Mott Center for Human Growth and Development, Department of Obstetrics and Gynecology, School of Medicine, Wayne State University, Detroit, MI, USA
- Institute of Environmental Health Sciences, Wayne State University, Detroit, MI, USA
| | - Alberto Darszon
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, UNAM, Cuernavaca, México
| | - Pablo E Visconti
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| |
Collapse
|
15
|
Gruber FS, Richardson A, Johnston ZC, Myles R, Norcross NR, Day DP, Georgiou I, Sesma-Sanz L, Wilson C, Read KD, Martins da Silva S, Barratt CLR, Gilbert IH, Swedlow JR. Sperm Toolbox-A selection of small molecules to study human spermatozoa. PLoS One 2024; 19:e0297666. [PMID: 38377053 PMCID: PMC10878532 DOI: 10.1371/journal.pone.0297666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 01/11/2024] [Indexed: 02/22/2024] Open
Abstract
Male contraceptive options and infertility treatments are limited, and almost all innovation has been limited to updates to medically assisted reproduction protocols and methods. To accelerate the development of drugs that can either improve or inhibit fertility, we established a small molecule library as a toolbox for assay development and screening campaigns using human spermatozoa. We have profiled all compounds in the Sperm Toolbox in several automated high-throughput assays that measure stimulation or inhibition of sperm motility or the acrosome reaction. We have assayed motility under non-capacitating and capacitating conditions to distinguish between pathways operating under these different physiological states. We also assayed cell viability to ensure any effects on sperm function are specific. A key advantage of our studies is that all compounds are assayed together in the same experimental conditions, which allows quantitative comparisons of their effects in complementary functional assays. We have combined the resulting datasets to generate fingerprints of the Sperm Toolbox compounds on sperm function. The data are included in an on-line R-based app for convenient querying.
Collapse
Affiliation(s)
- Franz S. Gruber
- Divisions of Computational Biology and Molecular, Cell and Developmental Biology, and National Phenotypic Screening Centre, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Anthony Richardson
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Zoe C. Johnston
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom
| | - Rachel Myles
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom
| | - Neil R. Norcross
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - David P. Day
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Irene Georgiou
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Laura Sesma-Sanz
- Divisions of Computational Biology and Molecular, Cell and Developmental Biology, and National Phenotypic Screening Centre, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Caroline Wilson
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Kevin D. Read
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Sarah Martins da Silva
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Christopher L. R. Barratt
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom
| | - Ian H. Gilbert
- Drug Discovery Unit, Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Jason R. Swedlow
- Divisions of Computational Biology and Molecular, Cell and Developmental Biology, and National Phenotypic Screening Centre, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| |
Collapse
|
16
|
Li HL, Go S, Chang JC, Verhoeven A, Elferink RO. Soluble adenylyl cyclase, the cell-autonomous member of the family. Biochim Biophys Acta Mol Basis Dis 2024; 1870:166936. [PMID: 37951509 DOI: 10.1016/j.bbadis.2023.166936] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/12/2023] [Accepted: 10/24/2023] [Indexed: 11/14/2023]
Abstract
Soluble adenylyl cyclase (sAC) is the evolutionarily most ancient of a set of 10 adenylyl cyclases (Adcys). While Adcy1 to Adcy9 are cAMP-producing enzymes that are activated by G-protein coupled receptors (GPCRs), Adcy10 (sAC) is an intracellular adenylyl cyclase. sAC plays a pivotal role in numerous cellular processes, ranging from basic physiological functions to complex signaling cascades. As a distinct member of the adenylyl cyclase family, sAC is not activated by GPCRs and stands apart due to its unique characteristics, regulation, and localization within cells. This minireview aims to honour Ulli Brandt, the outgoing Executive Editor of our journal, Biochimica Biophysica Acta (BBA), and longstanding Executive Editor of the BBA section Bioenergetics. We will therefore focus this review on bioenergetic aspects of sAC and, in addition, review some important recent general developments in the field of research on sAC.
Collapse
Affiliation(s)
- Hang Lam Li
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, the Netherlands
| | - Simei Go
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, the Netherlands
| | - Jung-Chin Chang
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, the Netherlands
| | - Arthur Verhoeven
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, the Netherlands
| | - Ronald Oude Elferink
- Tytgat Institute for Liver and Intestinal Research, Research Institute AGEM, Amsterdam UMC, the Netherlands.
| |
Collapse
|
17
|
Nickels L, Yan W. Nonhormonal Male Contraceptive Development-Strategies for Progress. Pharmacol Rev 2023; 76:37-48. [PMID: 38101934 PMCID: PMC10759220 DOI: 10.1124/pharmrev.122.000787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 11/03/2023] [Accepted: 11/06/2023] [Indexed: 12/17/2023] Open
Abstract
Despite the widely demonstrated public health benefits of contraception, limited contraceptive options are available for men, placing both the contraceptive burden and opportunity solely on women. This review outlines the need for an increased focus on male contraceptive development and highlights several related topics, including the perspectives of women and men on male contraceptives, historical challenges, and reasons behind the persistent delays in male contraceptive development. It also discusses the importance of serendipitous observations in drug discovery and the limitations of depleting sperm or spermatogenic cells as a contraceptive approach. It further provides an overview of ongoing research and development on novel methods, with a goal to offer insights into the multifaceted aspects of nonhormonal male contraceptive development, addressing its implications for the health of men and women. SIGNIFICANCE STATEMENT: Despite well over half a century of effort in developing male contraceptives, there are no approved male contraceptive drugs on the market. This review aims to present strategies for progress in nonhormonal male contraception based on lessons learned from history, with the hope of expediting development and bringing a male contraceptive drug closer to reality.
Collapse
Affiliation(s)
- Logan Nickels
- Male Contraceptive Initiative, Durham, North Carolina (L.N.); The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, California (W.Y.); and Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California (W.Y.)
| | - Wei Yan
- Male Contraceptive Initiative, Durham, North Carolina (L.N.); The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, California (W.Y.); and Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California (W.Y.)
| |
Collapse
|
18
|
Louwagie EJ, Quinn GFL, Pond KL, Hansen KA. Male contraception: narrative review of ongoing research. Basic Clin Androl 2023; 33:30. [PMID: 37940863 PMCID: PMC10634021 DOI: 10.1186/s12610-023-00204-z] [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: 05/05/2023] [Accepted: 07/26/2023] [Indexed: 11/10/2023] Open
Abstract
BACKGROUND Since the release of the combined oral contraceptive pill in 1960, women have shouldered the burden of contraception and family planning. Over 60 years later, this is still the case as the only practical, effective contraceptive options available to men are condoms and vasectomy. However, there are now a variety of promising hormonal and non-hormonal male contraceptive options being studied. The purpose of this narrative review is to provide clinicians and laypeople with focused, up-to-date descriptions of novel strategies and targets for male contraception. We include a cautiously optimistic discussion of benefits and potential drawbacks, highlighting several methods in preclinical and clinical stages of development. RESULTS As of June 2023, two hormonal male contraceptive methods are undergoing phase II clinical trials for safety and efficacy. A large-scale, international phase IIb trial investigating efficacy of transdermal segesterone acetate (Nestorone) plus testosterone gel has enrolled over 460 couples with completion estimated for late 2024. A second hormonal method, dimethandrolone undecanoate, is in two clinical trials focusing on safety, pharmacodynamics, suppression of spermatogenesis and hormones; the first of these two is estimated for completion in December 2024. There are also several non-hormonal methods with strong potential in preclinical stages of development. CONCLUSIONS There exist several hurdles to novel male contraception. Therapeutic development takes decades of time, meticulous work, and financial investment, but with so many strong candidates it is our hope that there will soon be several safe, effective, and reversible contraceptive options available to male patients.
Collapse
Affiliation(s)
- Eli J Louwagie
- University of South Dakota Sanford School of Medicine, 1400 W 22nd St, Sioux Falls, SD, 57105, USA.
| | - Garrett F L Quinn
- University of South Dakota Sanford School of Medicine, 1400 W 22nd St, Sioux Falls, SD, 57105, USA
| | - Kristi L Pond
- University of South Dakota Sanford School of Medicine, 1400 W 22nd St, Sioux Falls, SD, 57105, USA
| | - Keith A Hansen
- Chair and Professor, Dept. of Obstetrics and Gynecology, University of South Dakota Sanford School of Medicine; Reproductive Endocrinologist, Sanford Fertility and Reproductive Medicine, 1500 W 22nd St Suite 102, Sioux Falls, SD, 57105, USA
| |
Collapse
|
19
|
Amory JK. Male Contraception. Semin Reprod Med 2023; 41:279-286. [PMID: 38113922 DOI: 10.1055/s-0043-1777757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Approximately 40 to 50% of pregnancies are unintended. Contraceptive use significantly reduces the risk of unintended pregnancy. Approximately 70% of couples' contraceptive use is female and 30% is male, attributable to the reliance on condoms and vasectomies. Unfortunately, many women cannot use currently available contraceptives due to medical contraindications or side effects. At the same time, men want additional safe and effective contraceptive methods. Because of this, work to develop novel, safe, and effective male contraceptives is underway. This review will briefly discuss the pros and cons of condoms and vasectomies, and then describe research into the development of novel methods of male contraception, by the mechanism of action of the contraceptive. First, we will discuss male contraceptives that block sperm transmission. Next, we will discuss male contraceptives that impair sperm production. Lastly, we will discuss male contraceptives that impair sperm function.
Collapse
Affiliation(s)
- John K Amory
- Department of Medicine, The Center for Research in Reproduction and Contraception, University of Washington, Seattle, Washington
| |
Collapse
|
20
|
Kalienkova V, Peter MF, Rheinberger J, Paulino C. Structures of a sperm-specific solute carrier gated by voltage and cAMP. Nature 2023; 623:202-209. [PMID: 37880361 PMCID: PMC10620091 DOI: 10.1038/s41586-023-06629-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 09/08/2023] [Indexed: 10/27/2023]
Abstract
The newly characterized sperm-specific Na+/H+ exchanger stands out by its unique tripartite domain composition1,2. It unites a classical solute carrier unit with regulatory domains usually found in ion channels, namely, a voltage-sensing domain and a cyclic-nucleotide binding domain1,3, which makes it a mechanistic chimera and a secondary-active transporter activated strictly by membrane voltage. Our structures of the sea urchin SpSLC9C1 in the absence and presence of ligands reveal the overall domain arrangement and new structural coupling elements. They allow us to propose a gating model, where movements in the voltage sensor indirectly cause the release of the exchanging unit from a locked state through long-distance allosteric effects transmitted by the newly characterized coupling helices. We further propose that modulation by its ligand cyclic AMP occurs by means of disruption of the cytosolic dimer interface, which lowers the energy barrier for S4 movements in the voltage-sensing domain. As SLC9C1 members have been shown to be essential for male fertility, including in mammals2,4,5, our structure represents a potential new platform for the development of new on-demand contraceptives.
Collapse
Affiliation(s)
- Valeria Kalienkova
- Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Groningen, The Netherlands
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Martin F Peter
- Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Groningen, The Netherlands
- Biochemistry Center, Heidelberg University, Heidelberg, Germany
| | - Jan Rheinberger
- Biochemistry Center, Heidelberg University, Heidelberg, Germany
| | - Cristina Paulino
- Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Groningen, The Netherlands.
- Biochemistry Center, Heidelberg University, Heidelberg, Germany.
| |
Collapse
|
21
|
Wang C, Meriggiola MC, Amory JK, Barratt CLR, Behre HM, Bremner WJ, Ferlin A, Honig S, Kopa Z, Lo K, Nieschlag E, Page ST, Sandlow J, Sitruk-Ware R, Swerdloff RS, Wu FCW, Goulis DG. Practice and development of male contraception: European Academy of Andrology and American Society of Andrology guidelines. Andrology 2023. [PMID: 37727884 DOI: 10.1111/andr.13525] [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: 08/30/2023] [Accepted: 08/31/2023] [Indexed: 09/21/2023]
Abstract
BACKGROUNDS Despite a wide spectrum of contraceptive methods for women, the unintended pregnancy rate remains high (45% in the US), with 50% resulting in abortion. Currently, 20% of global contraceptive use is male-directed, with a wide variation among countries due to limited availability and lack of efficacy. Worldwide studies indicate that >50% of men would opt to use a reversible method, and 90% of women would rely on their partner to use a contraceptive. Additional reasons for novel male contraceptive methods to be available include the increased life expectancy, sharing the reproductive risks among partners, social issues, the lack of pharma industry involvement and the lack of opinion makers advocating for male contraception. AIM The present guidelines aim to review the status regarding male contraception, the current state of the art to support the clinical practice, recommend minimal requirements for new male contraceptive development and provide and grade updated, evidence-based recommendations from the European Society of Andrology (EAA) and the American Society of Andrology (ASA). METHODS An expert panel of academicians appointed by the EAA and the ASA generated a consensus guideline according to the GRADE (Grading of Recommendations, Assessment, Development and Evaluation) system. RESULTS Sixty evidence-based and graded recommendations were produced on couple-centered communication, behaviors, barrier methods, semen analysis and contraceptive efficacy, physical agents, surgical methods, actions before initiating male contraception, hormonal methods, non-hormonal methods, vaccines, and social and ethical considerations. CONCLUSION As gender roles transform and gender equity is established in relationships, the male contribution to family planning must be facilitated. Efficient and safe male-directed methods must be evaluated and introduced into clinical practice, preferably reversible, either hormonal or non-hormonal. From a future perspective, identifying new hormonal combinations, suitable testicular targets, and emerging vas occlusion methods will produce novel molecules and products for male contraception.
Collapse
Affiliation(s)
- Christina Wang
- Division of Endocrinology, Department of Medicine and Clinical and Translational Science Institute, The Lundquist Insitute and Harbor-UCLA Medical Center, Torrance, California, USA
| | - Maria Cristina Meriggiola
- Division of Gynecology and Human Reproduction Physiopathology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - John K Amory
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Christopher L R Barratt
- Division of Systems and Cellular Medicine, Medical School, Ninewells Hospital, University of Dundee, Dundee, Scotland
| | - Hermann M Behre
- Center for Reproductive Medicine and Andrology, University Medicine Halle, Halle, Germany
| | - William J Bremner
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Alberto Ferlin
- Unit of Andrology and Reproductive Medicine, Department of Medicine, University of Padova, Padova, Italy
| | - Stanton Honig
- Division of Reproductive and Sexual Medicine, Department of Urology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Zsolt Kopa
- Department of Urology, Andrology Centre, Semmelweis University, Budapest, Hungary
| | - Kirk Lo
- Division of Urology, Department of Surgery, University of Toronto, Toronto, Canada
| | - Eberhard Nieschlag
- Center of Reproductive Medicine and Andrology, University Hospital, Münster, Germany
| | - Stephanie T Page
- Division of Metabolism, Endocrinology and Nutrition, UW Medicine Diabetes Institute, University of Washington School of Medicine, Seattle, Washington, USA
| | - Jay Sandlow
- Department of Urology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Regine Sitruk-Ware
- Center for Biomedical Research, Population Council, New York, New York, USA
| | - Ronald S Swerdloff
- Division of Endocrinology, Department of Medicine, The Lundquist Institute and Harbor-UCLA Medical Center, Torrance, California, USA
| | - Frederick C W Wu
- Division of Endocrinology, Diabetes and Gastroenterology, Faculty of Biology, Medicine and Health, School of Medical Sciences, University of Manchester, Manchester, UK
| | - Dimitrios G Goulis
- First Department of Obstetrics and Gynecology, Unit of Reproductive Endocrinology, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
| |
Collapse
|
22
|
Mariani NAP, Silva JV, Fardilha M, Silva EJR. Advances in non-hormonal male contraception targeting sperm motility. Hum Reprod Update 2023; 29:545-569. [PMID: 37141450 DOI: 10.1093/humupd/dmad008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 03/23/2023] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND The high rates of unintended pregnancy and the ever-growing world population impose health, economic, social, and environmental threats to countries. Expanding contraceptive options, including male methods, are urgently needed to tackle these global challenges. Male contraception is limited to condoms and vasectomy, which are unsuitable for many couples. Thus, novel male contraceptive methods may reduce unintended pregnancies, meet the contraceptive needs of couples, and foster gender equality in carrying the contraceptive burden. In this regard, the spermatozoon emerges as a source of druggable targets for on-demand, non-hormonal male contraception based on disrupting sperm motility or fertilization. OBJECTIVE AND RATIONALE A better understanding of the molecules governing sperm motility can lead to innovative approaches toward safe and effective male contraceptives. This review discusses cutting-edge knowledge on sperm-specific targets for male contraception, focusing on those with crucial roles in sperm motility. We also highlight challenges and opportunities in male contraceptive drug development targeting spermatozoa. SEARCH METHODS We conducted a literature search in the PubMed database using the following keywords: 'spermatozoa', 'sperm motility', 'male contraception', and 'drug targets' in combination with other related terms to the field. Publications until January 2023 written in English were considered. OUTCOMES Efforts for developing non-hormonal strategies for male contraception resulted in the identification of candidates specifically expressed or enriched in spermatozoa, including enzymes (PP1γ2, GAPDHS, and sAC), ion channels (CatSper and KSper), transmembrane transporters (sNHE, SLC26A8, and ATP1A4), and surface proteins (EPPIN). These targets are usually located in the sperm flagellum. Their indispensable roles in sperm motility and male fertility were confirmed by genetic or immunological approaches using animal models and gene mutations associated with male infertility due to sperm defects in humans. Their druggability was demonstrated by the identification of drug-like small organic ligands displaying spermiostatic activity in preclinical trials. WIDER IMPLICATIONS A wide range of sperm-associated proteins has arisen as key regulators of sperm motility, providing compelling druggable candidates for male contraception. Nevertheless, no pharmacological agent has reached clinical developmental stages. One reason is the slow progress in translating the preclinical and drug discovery findings into a drug-like candidate adequate for clinical development. Thus, intense collaboration among academia, private sectors, governments, and regulatory agencies will be crucial to combine expertise for the development of male contraceptives targeting sperm function by (i) improving target structural characterization and the design of highly selective ligands, (ii) conducting long-term preclinical safety, efficacy, and reversibility evaluation, and (iii) establishing rigorous guidelines and endpoints for clinical trials and regulatory evaluation, thus allowing their testing in humans.
Collapse
Affiliation(s)
- Noemia A P Mariani
- Department of Biophysics and Pharmacology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, Brazil
| | - Joana V Silva
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro, Portugal
- QOPNA & LAQV, Department of Chemistry, University of Aveiro, Aveiro, Portugal
- Multidisciplinary Research in Biomedicine (UMIB), Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Margarida Fardilha
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro, Portugal
| | - Erick J R Silva
- Department of Biophysics and Pharmacology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, Brazil
| |
Collapse
|
23
|
Wiggins SV, Schreiner R, Ferreira J, Marmorstein AD, Levin LR, Buck J. Carbonic Anhydrase Inhibitor Modulation of Intraocular Pressure Is Independent of Soluble Adenylyl Cyclase. J Ocul Pharmacol Ther 2023; 39:317-323. [PMID: 37097314 PMCID: PMC10398745 DOI: 10.1089/jop.2022.0180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 03/20/2023] [Indexed: 04/26/2023] Open
Abstract
Purpose: We investigated whether a clinically used carbonic anhydrase inhibitor (CAIs) can modulate intraocular pressure (IOP) through soluble adenylyl cyclase (sAC) signaling. Methods: IOP was measured 1 h after topical treatment with brinzolamide, a topically applied and clinically used CAIs, using direct cannulation of the anterior chamber in sAC knockout (KO) mice or C57BL/6J mice in the presence or absence of the sAC inhibitor (TDI-10229). Results: Mice treated with the sAC inhibitor TDI-10229 had elevated IOP. CAIs treatment significantly decreased increased intraocular pressure (IOP) in wild-type, sAC KO mice, as well as TDI-10229-treated mice. Conclusions: Inhibiting carbonic anhydrase reduces IOP independently from sAC in mice. Our studies suggest that the signaling cascade by which brinzolamide regulates IOP does not involve sAC.
Collapse
Affiliation(s)
- Shakarr V. Wiggins
- Department of Pharmacology, Weill Cornell Medicine, New York, New York, USA
- Graduate Program in Neuroscience, Weill Cornell Medicine, New York, New York, USA
| | - Ryan Schreiner
- Division of Regenerative Medicine, Department of Medicine, Ansary Stem Cell Institute, Weill Cornell Medicine, New York, New York, USA
| | - Jacob Ferreira
- Department of Pharmacology, Weill Cornell Medicine, New York, New York, USA
| | | | - Lonny R. Levin
- Department of Pharmacology, Weill Cornell Medicine, New York, New York, USA
| | - Jochen Buck
- Department of Pharmacology, Weill Cornell Medicine, New York, New York, USA
| |
Collapse
|
24
|
Sun S, Fushimi M, Rossetti T, Kaur N, Ferreira J, Miller M, Quast J, van den Heuvel J, Steegborn C, Levin LR, Buck J, Myers RW, Kargman S, Liverton N, Meinke PT, Huggins DJ. Scaffold Hopping and Optimization of Small Molecule Soluble Adenyl Cyclase Inhibitors Led by Free Energy Perturbation. J Chem Inf Model 2023; 63:2828-2841. [PMID: 37060320 DOI: 10.1021/acs.jcim.2c01577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Free energy perturbation is a computational technique that can be used to predict how small changes to an inhibitor structure will affect the binding free energy to its target. In this paper, we describe the utility of free energy perturbation with FEP+ in the hit-to-lead stage of a drug discovery project targeting soluble adenyl cyclase. The project was structurally enabled by X-ray crystallography throughout. We employed free energy perturbation to first scaffold hop to a preferable chemotype and then optimize the binding affinity to sub-nanomolar levels while retaining druglike properties. The results illustrate that effective use of free energy perturbation can enable a drug discovery campaign to progress rapidly from hit to lead, facilitating proof-of-concept studies that enable target validation.
Collapse
Affiliation(s)
- Shan Sun
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Makoto Fushimi
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Thomas Rossetti
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - Navpreet Kaur
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - Jacob Ferreira
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - Michael Miller
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Jonathan Quast
- Department of Biochemistry, University of Bayreuth, Bayreuth 95440, Germany
| | | | - Clemens Steegborn
- Department of Biochemistry, University of Bayreuth, Bayreuth 95440, Germany
| | - Lonny R Levin
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - Jochen Buck
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - Robert W Myers
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Stacia Kargman
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Nigel Liverton
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
| | - Peter T Meinke
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
- Department of Pharmacology, Weill Cornell Medicine, New York City, New York 10056, United States
| | - David J Huggins
- Tri-Institutional Therapeutics Discovery Institute, New York, New York 10021, United States
- Department of Physiology and Biophysics, Weill Cornell Medical College of Cornell University, New York, New York 10065, United States
| |
Collapse
|
25
|
Ritagliati C, Ayoub S, Balbach M, Buck J, Levin LR. In vivo characterization of sAC null sperm. Front Cell Dev Biol 2023; 11:1134051. [PMID: 37152282 PMCID: PMC10160483 DOI: 10.3389/fcell.2023.1134051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 04/12/2023] [Indexed: 05/09/2023] Open
Abstract
Targeted disruption of the soluble adenylyl cyclase (ADCY10; sAC) gene results in male-specific sterility without affecting spermatogenesis, mating behavior, or spermatozoa morphology and count; however, it dramatically impairs sperm motility and prevents capacitation. These phenotypes were identified in sperm from sAC null mice surgically extracted from the epididymis and studied in vitro. Epididymal sperm are dormant, and never exposed to physiological activators in semen or the female reproductive tract. To study sAC null sperm under conditions which more closely resemble natural fertilization, we explored phenotypes of ejaculated sAC null sperm in vivo post-coitally as well as ex vivo, collected from the female reproductive tract. Ex vivo ejaculated sAC null sperm behaved similarly to epididymal sAC null sperm, except with respect to the physiologically induced acrosome reaction. These studies suggest there is a sAC-independent regulation of acrosome responsiveness induced upon ejaculation or exposure to factors in the female reproductive tract. We also studied the behavior of sAC null sperm in vivo post-coitally by taking advantage of transgenes with fluorescently labelled sperm. Transgenes expressing GFP in the acrosome and DsRed2 in the mitochondria located in the midpiece of sperm (DsRed2/Acr3-EGFP) allow visualization of sperm migration through the female reproductive tract after copulation. As previously reported, sperm from wild type (WT) double transgenic mice migrated from the uterus through the uterotubular junction (UTJ) into the oviduct within an hour post-copulation. In contrast, sperm from sAC null double transgenic mice were only found in the uterus. There were no sAC null sperm in the oviduct, even 8 h after copulation. These results demonstrate that sAC KO males are infertile because their sperm do not migrate to the fertilization site.
Collapse
|