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Tian Y, Guo J, Hua L, Jiang Y, Ge W, Zhang X, Cai D, Lu D, Wang B, Shen W, Sun Z, Han B. Mechanisms of imbalanced testicular homeostasis in infancy due to aberrant histone acetylation in undifferentiated spermatogonia under different concentrations of Di(2-ethylhexyl) phthalate (DEHP) exposure. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 347:123742. [PMID: 38460586 DOI: 10.1016/j.envpol.2024.123742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 03/03/2024] [Accepted: 03/06/2024] [Indexed: 03/11/2024]
Abstract
Di (2-ethylhexyl) phthalate (DEHP), identified as an endocrine-disrupting chemical, is associated with reproductive toxicity. This association is particularly noteworthy in newborns with incompletely developed metabolic functions, as exposure to DEHP can induce enduring damage to the reproductive system, potentially influencing adult reproductive health. In this study, we continuously administered 40 μg/kg and 80 μg/kg DEHP to postnatal day 5 (PD5) mice for ten days to simulate low and high doses of DEHP exposure during infancy. Utilizing single-cell RNA sequencing (scRNA-seq), our analysis revealed that varying concentrations of DEHP exposure during infancy induced distinct DNA damage response characteristics in testicular Undifferentiated spermatogonia (Undiff SPG). Specifically, DNA damage triggered mitochondrial dysfunction, leading to acetyl-CoA content alterations. Subsequently, this disruption caused aberrations in histone acetylation patterns, ultimately resulting in apoptosis of Undiff SPG in the 40 μg/kg DEHP group and autophagy in the 80 μg/kg DEHP group. Furthermore, we found that DEHP exposure impacts the development and functionality of Sertoli and Leydig cells through the focal adhesion and PPAR signaling pathways, respectively. We also revealed that Leydig cells regulate the metabolic environment of Undiff SPG via Ptn-Sdc4 and Mdk-Sdc4 after DEHP exposure. Finally, our study provided pioneering evidence that disruptions in testicular homeostasis induced by DEHP exposure during infancy endure into adulthood. In summary, this study elucidates the molecular mechanisms through which DEHP exposure during infancy influences the development of testicular cell populations.
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Affiliation(s)
- Yu Tian
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China; College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Jiachen Guo
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Lei Hua
- School of Clinical Medicine, Henan University, Kaifeng, China
| | - Yinuo Jiang
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China
| | - Wei Ge
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Xiaoyuan Zhang
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Diya Cai
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China
| | - Dongliang Lu
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China
| | - Bin Wang
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China
| | - Wei Shen
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Zhongyi Sun
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China
| | - Baoquan Han
- Department of Urology, Shenzhen University General Hospital, Shenzhen, China.
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Nady Ouais G, Kamar SA, Mousa AA, Sonbol MM. The Protective effects of Vitamin E against alterations of rat testis structure induced by deltamethrin; histological, ultrastructure, and biochemical study. Ultrastruct Pathol 2024; 48:108-120. [PMID: 38073084 DOI: 10.1080/01913123.2023.2292563] [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: 09/13/2023] [Accepted: 12/05/2023] [Indexed: 02/08/2024]
Abstract
Deltamethrin is a widely used synthetic pyrethroid pesticide. It causes reproductive toxicity. Aim of the work: it evaluates the impact of vitamin E in restoration of the testicular integrity of albino rats after toxicity induced by Deltamethrin. Thirty-six adult male albino rats were included, and they were further sub-divided into four experimental groups; Group A: six rats served as controls. Group B (Model): 10 rats equally divided into two sub-groups (B1): the rats received deltamethrin dissolved in oil in a dose of 0.6 mg/kg/daily by nasogastric gavage for 2 weeks. (B2): the rats received Deltamethrin in the same dose of group B1 for 1 month. Group C (Protected): 10 rats equally divided into two sub-groups (C1): the rats received deltamethrin orally 0.6 mg/kg/day concomitant with Vitamin E dissolved in 1 ml of corn oil in a dose 200 mg/kg/day by nasogastric gavage for 2 weeks. (C2): the rats received deltamethrin concomitant with Vitamin E in the same dose of group C1 for 1 month. Group D (Treatment): 10 rats received deltamethrin for 1 month followed by Vitamin E for another month in the same previously prescribed doses. Significant decreases in serum testosterone level, GSH, catalase activity, and significant increase in MDA in the deltamethrin-treated group were detected. Moreover, histological and ultrastructural examinations of the testis seminiferous tubules showed detrimental alterations in the deltamethrin group which were duration dependent. Vitamin E administration reversed such alterations. Vitamin E ameliorates the testicular dysfunction caused by Deltamethrin.
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Affiliation(s)
- Ghada Nady Ouais
- Anatomy and Embryology Department, Faculty of Medicine, Cairo University Cairo, Cairo, Egypt
- Anatomy and Embryology Department, Faculty of Medicine, New Giza University, Giza, Egypt
| | - Sherif A Kamar
- Faculty of Dentistry, Al-Ahliyya Amman University (AAU), Amman, Jordan
- Anatomy and Embryology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Ali Ahmed Mousa
- Anatomy and Embryology Department, Faculty of Medicine, Jouf University, Sakaka,AL-Jouf, Kingdom of Saudi Arabia
| | - Mohamed Mostafa Sonbol
- Anatomy and Embryology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
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Olojede SO, Lawal SK, Faborode OS, Dare A, Aladeyelu OS, Moodley R, Rennie CO, Naidu EC, Azu OO. Testicular ultrastructure and hormonal changes following administration of tenofovir disoproxil fumarate-loaded silver nanoparticle in type-2 diabetic rats. Sci Rep 2022; 12:9633. [PMID: 35688844 PMCID: PMC9187647 DOI: 10.1038/s41598-022-13321-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 05/23/2022] [Indexed: 11/10/2022] Open
Abstract
Reproductive dysfunctions (RDs) characterized by impairment in testicular parameters, and metabolic disorders such as insulin resistance and type 2 diabetes mellitus (T2DM) are on the rise among human immunodeficiency virus (HIV) patients under tenofovir disoproxil fumarate (TDF) and highly active antiretroviral therapy (HAART). These adverse effects require a nanoparticle delivery system to circumvent biological barriers and ensure adequate ARVDs to viral reservoir sites like testis. This study aimed to investigate the effect of TDF-loaded silver nanoparticles (AgNPs), TDF-AgNPs on sperm quality, hormonal profile, insulin-like growth factor 1 (IGF-1), and testicular ultrastructure in diabetic rats, a result of which could cater for the neglected reproductive and metabolic dysfunctions in HIV therapeutic modality. Thirty-six adult Sprague–Dawley rats were assigned to diabetic and non-diabetic (n = 18). T2DM was induced by fructose-streptozotocin (Frt-STZ) rat model. Subsequently, the rats in both groups were subdivided into three groups each (n = 6) and administered distilled water, TDF, and TDF-AgNP. In this study, administration of TDF-AgNP to diabetic rats significantly reduced (p < 0.05) blood glucose level (268.7 ± 10.8 mg/dL) from 429 ± 16.9 mg/dL in diabetic control and prevented a drastic reduction in sperm count and viability. More so, TDF-AgNP significantly increased (p < 0.05) Gonadotropin-Releasing Hormone (1114.3 ± 112.6 µg), Follicle Stimulating Hormone (13.2 ± 1.5 IU/L), Luteinizing Hormone (140.7 ± 15.2 IU/L), testosterone (0.2 ± 0.02 ng/L), and IGF-1 (1564.0 ± 81.6 ng/mL) compared to their respective diabetic controls (383.4 ± 63.3, 6.1 ± 1.2, 76.1 ± 9.1, 0.1 ± 0.01, 769.4 ± 83.7). Also, TDF-AgNP treated diabetic rats presented an improved testicular architecture marked with the thickened basement membrane, degenerated Sertoli cells, spermatogenic cells, and axoneme. This study has demonstrated that administration of TDF-AgNPs restored the function of hypothalamic-pituitary–gonadal axis, normalized the hormonal profile, enhanced testicular function and structure to alleviate reproductive dysfunctions in diabetic rats. This is the first study to conjugate TDF with AgNPs and examined its effects on reproductive indices, local gonadal factor and testicular ultrastructure in male diabetic rats with the potential to cater for neglected reproductive dysfunction in HIV therapeutic modality.
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Affiliation(s)
- Samuel Oluwaseun Olojede
- Discipline of Clinical Anatomy, School of Laboratory Medicine & Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, 719 Umbilo Road, Durban, South Africa.
| | - Sodiq Kolawole Lawal
- Discipline of Clinical Anatomy, School of Laboratory Medicine & Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, 719 Umbilo Road, Durban, South Africa
| | - Oluwaseun Samuel Faborode
- Discipline of Physiology, School of Laboratory Medicine & Medical Sciences, College of Health Sciences, Westville Campus, University of KwaZulu-Natal, Durban, South Africa.,Department of Physiology, Faculty of Basic Medical Sciences, Bingham University, Karu, Nasarawa State, Nigeria
| | - Ayobami Dare
- Discipline of Physiology, School of Laboratory Medicine & Medical Sciences, College of Health Sciences, Westville Campus, University of KwaZulu-Natal, Durban, South Africa
| | - Okikioluwa Stephen Aladeyelu
- Discipline of Clinical Anatomy, School of Laboratory Medicine & Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, 719 Umbilo Road, Durban, South Africa
| | - Roshila Moodley
- The Department of Chemistry, The University of Manchester, Manchester, UK
| | - Carmen Olivia Rennie
- Discipline of Clinical Anatomy, School of Laboratory Medicine & Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, 719 Umbilo Road, Durban, South Africa
| | - Edwin Coleridge Naidu
- Discipline of Clinical Anatomy, School of Laboratory Medicine & Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, 719 Umbilo Road, Durban, South Africa
| | - Onyemaechi Okpara Azu
- Department of Human, Biological & Translational Medical Sciences, School of Medicine, University of Namibia, Hage Geingob Campus, Private Bag 13301, Windhoek, Namibia
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Nayyab S, Gervasi MG, Tourzani DA, Caraballo DA, Jha KN, Teves ME, Cui W, Georg GI, Visconti PE, Salicioni AM. TSSK3, a novel target for male contraception, is required for spermiogenesis. Mol Reprod Dev 2021; 88:718-730. [PMID: 34623009 PMCID: PMC8961454 DOI: 10.1002/mrd.23539] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 09/24/2021] [Indexed: 12/27/2022]
Abstract
We have previously shown that members of the family of testis-specific serine/threonine kinases (TSSKs) are post-meiotically expressed in testicular germ cells and in mature sperm in mammals. The restricted post-meiotic expression of TSSKs as well as the importance of phosphorylation in signaling processes strongly suggest that TSSKs have an important role in germ cell differentiation and/or sperm function. This prediction has been supported by the reported sterile phenotype of the TSSK6 knock-out (KO) mice and of the double TSSK1/TSSK2 KO. The aim of this study was to develop KO mouse models of TSSK3 and to validate this kinase as a target for the development of a male contraceptive. We used CRISPR/Cas9 technology to generate the TSSK3 KO allele on B6D2F1 background mice. Male heterozygous pups were used to establish three independent TSSK3 KO lines. After natural mating of TSSK3 KO males, females that presented a plug (indicative of mating) were monitored for the following 24 days and no pregnancies or pups were found. Sperm numbers were drastically reduced in all three KO lines and, remarkably, round spermatids were detected in the cauda epididymis of KO mice. From the small population of sperm recovered, severe morphology defects were detected. Our results indicate an essential role of TSSK3 in spermiogenesis and support this kinase as a suitable candidate for the development of novel nonhormonal male contraceptives.
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Affiliation(s)
- Saman Nayyab
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts-Amherst, MA, USA
| | - María G. Gervasi
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
| | - Darya A. Tourzani
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
- Biotechnology Training Program, University of Massachusetts-Amherst, MA, USA
| | - Diego A. Caraballo
- Instituto de Ecología, Genética y Evolución (IEGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Kula N. Jha
- Division of Biotechnology Review and Research IV, Office of Biotechnology Products, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Maria E. Teves
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond VA, USA
| | - Wei Cui
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
- Animal Models Core Facility, Institute for Applied Life Sciences (IALS), University of Massachusetts-Amherst, MA, USA
| | - Gunda I. Georg
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, Minneapolis, MN, USA
| | - Pablo E. Visconti
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts-Amherst, MA, USA
| | - Ana M. Salicioni
- Department of Veterinary & Animal Sciences and University of Massachusetts-Amherst, MA, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts-Amherst, MA, USA
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A framework for high-resolution phenotyping of candidate male infertility mutants: from human to mouse. Hum Genet 2020; 140:155-182. [PMID: 32248361 DOI: 10.1007/s00439-020-02159-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 03/27/2020] [Indexed: 12/18/2022]
Abstract
Male infertility is a heterogeneous condition of largely unknown etiology that affects at least 7% of men worldwide. Classical genetic approaches and emerging next-generation sequencing studies support genetic variants as a frequent cause of male infertility. Meanwhile, the barriers to transmission of this disease mean that most individual genetic cases will be rare, but because of the large percentage of the genome required for spermatogenesis, the number of distinct causal mutations is potentially large. Identifying bona fide causes of male infertility thus requires advanced filtering techniques to select for high-probability candidates, including the ability to test causality in animal models. The mouse remains the gold standard for defining the genotype-phenotype connection in male fertility. Here, we present a best practice guide consisting of (a) major points to consider when interpreting next-generation sequencing data performed on infertile men, and, (b) a systematic strategy to categorize infertility types and how they relate to human male infertility. Phenotyping infertility in mice can involve investigating the function of multiple cell types across the testis and epididymis, as well as sperm function. These findings will feed into the diagnosis and treatment of male infertility as well as male health broadly.
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Öztaş E, Yılmaz TE, Güzel E, Sezer Z, Okyar A, Özhan G. Gliclazide alone or in combination with atorvastatin ameliorated reproductive damage in streptozotocin-induced type 2 diabetic male rats. Saudi Pharm J 2019; 27:422-431. [PMID: 30976187 PMCID: PMC6438782 DOI: 10.1016/j.jsps.2019.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 01/05/2019] [Indexed: 01/09/2023] Open
Abstract
High-fat diet/STZ-induced T2DM caused severe damage in rat male reproductive system. ATV treatment slightly improved the reproductive functions. GLZ treatment strongly ameliorated spermatogenesis as well as testicular structure. ATV/GLZ combination treatment improved sperm morphology and testes structure.
Objectives Type 2 diabetes (T2DM) is one of the most serious challenges of the 21th century with life-threatening complications and excessive health care costs. In diabetic patients, the main goal in T2DM treatment is the regulation of both blood glucose and lipid levels. For that, Gliclazide (GLZ), an oral antidiabetic, and Atorvastatin (ATV), a lipid lowering agent, are widely used drugs as combination. Diabetes has been reported severe impacts on male reproductive system; however, data obtained about ATV and GLZ treatment alone or in combination are conflicted or insufficient. Herein the effects of ATV and GLZ on male reproductive system in type 2 diabetic male rats have been investigated in the present study. Methods T2DM was induced by high-fat diet and single injection of streptozotocin (STZ) (35 mg/kg) in young adult male Sprague-Dawley rats. The diabetic rats were given ATV (10 mg/kg), GLZ (10 mg/kg) and ATV/GLZ (1:1, 10 mg/kg) combination by oral gavage for 28 days. The hormone levels were determined in the cardiac blood samples; and the histopathological and ultrastructural analyses were conducted in the testicular tissues and epididymal sperms. Results It was observed that diabetes had severe effects on testicular tissue and spermatogenesis. ATV treatment did not affect sperm count and testes structure (p > 0.05), however ameliorated sperm morphology (p < 0.05). GLZ treatment increased sperm count, and improved sperm morphology, testes structure and spermatogenesis (p < 0.05). ATV/GLZ combination treatment enhanced sperm morphology and improved testicular structure (p < 0.05) while did not affect sperm count (p > 0.05). Conclusion GLZ treatment regenerated testicular damage and sperm parameters whether alone or in combination with ATV in diabetic rats without affecting hypothalamic-pituitary-gonadal axis.
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Affiliation(s)
- Ezgi Öztaş
- Istanbul University, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Beyazıt, 34116 Istanbul, Turkey
| | - Tugba Ekiz Yılmaz
- Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Histology and Embryology, Fatih, 34098 Istanbul, Turkey
| | - Elif Güzel
- Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Histology and Embryology, Fatih, 34098 Istanbul, Turkey
| | - Zehra Sezer
- Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Histology and Embryology, Fatih, 34098 Istanbul, Turkey
| | - Alper Okyar
- Istanbul University, Faculty of Pharmacy, Department of Pharmacology, Beyazıt, 34116 Istanbul, Turkey
| | - Gül Özhan
- Istanbul University, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Beyazıt, 34116 Istanbul, Turkey
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Malatesta M. Ultrastructural histochemistry in biomedical research: Alive and kicking. Eur J Histochem 2018; 62. [PMID: 30418011 PMCID: PMC6250102 DOI: 10.4081/ejh.2018.2990] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 10/31/2018] [Indexed: 02/06/2023] Open
Abstract
The high-resolution images provided by the electron microscopy has constituted a limitless source of information in any research field of life and materials science since the early Thirties of the last century. Browsing the scientific literature, electron microscopy was especially popular from the 1970’s to 80’s, whereas during the 90’s, with the advent of innovative molecular techniques, electron microscopy seemed to be downgraded to a subordinate role, as a merely descriptive technique. Ultra -structural histochemistry was crucial to promote the Renaissance of electron microscopy, when it became evident that a precise localization of molecules in the biological environment was necessary to fully understand their functional role. Nowadays, electron microscopy is still irreplaceable for ultrastructural morphology in basic and applied biomedical research, while the application of correlative light and electron microscopy and of refined ultrastructural histochemical techniques gives electron microscopy a central role in functional cell and tissue biology, as a really unique tool for high-resolution molecular biology in situ.
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Affiliation(s)
- Manuela Malatesta
- University of Verona, Department of Neurosciences, Biomedicine and Movement Sciences.
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Zhu WJ. Preparation and observation methods can produce misleading artefacts in human sperm ultrastructural morphology. Andrologia 2018; 50:e13043. [DOI: 10.1111/and.13043] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2018] [Indexed: 11/28/2022] Open
Affiliation(s)
- W.-J. Zhu
- Department of Developmental and Regenerative Biology; College of Life Science and Technology; Jinan University; Guangzhou China
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Malla AB, Bhandari R. IP6K1 is essential for chromatoid body formation and temporal regulation of Tnp2 and Prm2 expression in mouse spermatids. J Cell Sci 2017; 130:2854-2866. [PMID: 28743739 DOI: 10.1242/jcs.204966] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/13/2017] [Indexed: 12/25/2022] Open
Abstract
Inositol hexakisphosphate kinases (IP6Ks) are enzymes that synthesise the inositol pyrophosphate 5-diphosphoinositol pentakisphosphate (5-IP7), which is known to regulate several physiological processes. Deletion of IP6K1, but not other IP6K isoforms, causes sterility in male mice. Here, we present a detailed investigation of the specific function of IP6K1 in spermatogenesis. Within the mouse testis, IP6K1 is expressed at high levels in late stage pachytene spermatocytes and in round spermatids. We found IP6K1 to be a novel component of the chromatoid body, a cytoplasmic granule found in round spermatids that is composed of RNA and RNA-binding proteins, and noted that this structure is absent in Ip6k1-/- round spermatids. Furthermore, juvenile spermatids from Ip6k1-/- mice display premature expression of the transition protein TNP2 and the protamine PRM2 due to translational derepression. The aberrant localisation of these key sperm-specific chromatin components, together with the persistence of somatic histones, results in abnormal spermatid elongation, failure to complete spermatid differentiation and azoospermia in these mice. Our study thus identifies IP6K1 as an indispensable factor in the temporal regulation of male germ cell differentiation.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Aushaq Bashir Malla
- Laboratory of Cell Signalling, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, Telangana 500001, India.,Graduate Studies, Manipal University, Manipal, Karnataka 576104, India
| | - Rashna Bhandari
- Laboratory of Cell Signalling, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, Telangana 500001, India
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Sánchez-Cárdenas C, Servín-Vences MR, José O, Treviño CL, Hernández-Cruz A, Darszon A. Acrosome reaction and Ca²⁺ imaging in single human spermatozoa: new regulatory roles of [Ca²⁺]i. Biol Reprod 2014; 91:67. [PMID: 25100708 DOI: 10.1095/biolreprod.114.119768] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The spermatozoa acrosome reaction (AR) is essential for mammalian fertilization. Few methods allow visualization of AR in real time together with Ca²⁺ imaging. Here, we show that FM4-64, a fluorescent dye used to follow exocytosis, reliably reports AR progression induced by ionomycin and progesterone in human spermatozoa. FM4-64 clearly delimits the spermatozoa contour and reports morphological cell changes before, during, and after AR. This strategy unveiled the formation of moving tubular appendages, emerging from acrosome-reacted spermatozoa, which was confirmed by scanning electron microscopy. Alternate wavelength illumination allowed concomitant imaging of FM4-64 and Fluo-4, a Ca²⁺ indicator. These AR and intracellular Ca²⁺ ([Ca²⁺]i) recordings revealed that the presence of [Ca²⁺]i oscillations, both spontaneous and progesterone induced, prevents AR in human spermatozoa. Notably, the progesterone-induced AR is preceded by a second [Ca²⁺]i peak and ~40% of reacting spermatozoa also manifest a slow [Ca²⁺]i rise ~2 min before AR. Our findings uncover new AR features related to [Ca²⁺]i.
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Affiliation(s)
- Claudia Sánchez-Cárdenas
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México
| | - Martha Rocio Servín-Vences
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México
| | - Omar José
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México
| | - Claudia Lydia Treviño
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México
| | - Arturo Hernández-Cruz
- Departamento de Neurociencia Cognitiva, Instituto de Fisiología Celular, UNAM, Circuito exterior s/n, Ciudad Universitaria, México DF
| | - Alberto Darszon
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México
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