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Bilekova S, Garcia-Colomer B, Cebrian-Serrano A, Schirge S, Krey K, Sterr M, Kurth T, Hauck SM, Lickert H. Inceptor facilitates acrosomal vesicle formation in spermatids and is required for male fertility. Front Cell Dev Biol 2023; 11:1240039. [PMID: 37691832 PMCID: PMC10483240 DOI: 10.3389/fcell.2023.1240039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/07/2023] [Indexed: 09/12/2023] Open
Abstract
Spermatogenesis is a crucial biological process that enables the production of functional sperm, allowing for successful reproduction. Proper germ cell differentiation and maturation require tight regulation of hormonal signals, cellular signaling pathways, and cell biological processes. The acrosome is a lysosome-related organelle at the anterior of the sperm head that contains enzymes and receptors essential for egg-sperm recognition and fusion. Even though several factors crucial for acrosome biogenesis have been discovered, the precise molecular mechanism of pro-acrosomal vesicle formation and fusion is not yet known. In this study, we investigated the role of the insulin inhibitory receptor (inceptor) in acrosome formation. Inceptor is a single-pass transmembrane protein with similarities to mannose-6-phosphate receptors (M6PR). Inceptor knockout male mice are infertile due to malformations in the acrosome and defects in the nuclear shape of spermatozoa. We show that inceptor is expressed in early spermatids and mainly localizes to vesicles between the Golgi apparatus and acrosome. Here we show that inceptor is an essential factor in the intracellular transport of trans-Golgi network-derived vesicles which deliver acrosomal cargo in maturing spermatids. The absence of inceptor results in vesicle-fusion defects, acrosomal malformation, and male infertility. These findings support our hypothesis of inceptor as a universal lysosomal or lysosome-related organelle sorting receptor expressed in several secretory tissues.
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Affiliation(s)
- Sara Bilekova
- Helmholtz Center Munich, German Research Center for Environmental Health GmbH, Institute of Diabetes and Regeneration Research, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- School of Medicine, Technical University of Munich, Munich, Germany
| | - Balma Garcia-Colomer
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Helmholtz Center Munich, Institute for Diabetes and Obesity, Neuherberg, Germany
| | - Alberto Cebrian-Serrano
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Helmholtz Center Munich, Institute for Diabetes and Obesity, Neuherberg, Germany
| | - Silvia Schirge
- Helmholtz Center Munich, German Research Center for Environmental Health GmbH, Institute of Diabetes and Regeneration Research, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Karsten Krey
- School of Medicine, Technical University of Munich, Munich, Germany
- Institute of Virology, Technical University of Munich, Munich, Germany
| | - Michael Sterr
- Helmholtz Center Munich, German Research Center for Environmental Health GmbH, Institute of Diabetes and Regeneration Research, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Thomas Kurth
- Center for Molecular and Cellular Bioengineering (CMCB), Technology Platform, Core Facility Electron Microscopy and Histology, Dresden University of Technology, Dresden, Germany
| | - Stefanie M. Hauck
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Metabolomics and Proteomics Core, Helmholtz Center Munich, German Research Center for Environmental Health GmbH, Munich, Germany
| | - Heiko Lickert
- Helmholtz Center Munich, German Research Center for Environmental Health GmbH, Institute of Diabetes and Regeneration Research, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- School of Medicine, Technical University of Munich, Munich, Germany
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Moreno RD. Human globozoospermia-related genes and their role in acrosome biogenesis. WIREs Mech Dis 2023; 15:e1589. [PMID: 36493758 DOI: 10.1002/wsbm.1589] [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: 07/24/2022] [Revised: 10/31/2022] [Accepted: 11/01/2022] [Indexed: 12/13/2022]
Abstract
The mammalian acrosome is a secretory vesicle attached to the sperm nucleus whose fusion with the overlying plasma membrane is required to achieve fertilization. Acrosome biogenesis starts during meiosis, but it lasts through the entire process of haploid cell differentiation (spermiogenesis). Acrosome biogenesis is a stepwise process that involves membrane traffic from the Golgi apparatus, but it also seems that the lysosome/endosome system participates in this process. Defective sperm head morphology is accompanied by defective acrosome shape and function, and patients with these characteristics are infertile or subfertile. The most extreme case of acrosome biogenesis failure is globozoospermia syndrome, which is primarily characterized by the presence of round-headed spermatozoa without acrosomes with cytoskeleton defects around the nucleus and infertility. Several genes participating in acrosome biogenesis have been uncovered using genetic deletions in mice, but only a few of them have been found to be deleted or modified in patients with globozoospermia. Understanding acrosome biogenesis is crucial to uncovering the molecular basis of male infertility and developing new diagnostic tools and assisted reproductive technologies that may help infertile patients through more effective treatment techniques. This article is categorized under: Reproductive System Diseases > Environmental Factors Infectious Diseases > Stem Cells and Development Reproductive System Diseases > Molecular and Cellular Physiology.
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Affiliation(s)
- Ricardo D Moreno
- Departmento de Fisiología, Pontificia Universidad Católica de Chile, Santiago, Chile
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Testicular Germ Cell Tumours and Proprotein Convertases. Cancers (Basel) 2022; 14:cancers14071633. [PMID: 35406405 PMCID: PMC8996948 DOI: 10.3390/cancers14071633] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/08/2022] [Accepted: 03/10/2022] [Indexed: 02/05/2023] Open
Abstract
Simple Summary Despite the high survival rate of the most common neoplasia in young Caucasian men: Testicular Germ Cell Tumors (TGCT), the quality of life of these patients is impaired by the multiple long-term side effects of their treatment. The study of molecules that can serve both as diagnostic biomarkers for tumor development and as therapeutic targets seems necessary. Proprotein convertases (PC) are a group of proteases responsible for the maturation of inactive proproteins with very diverse functions, whose alterations in expression have been associated with various diseases, such as other types of cancer and inflammation. The study of the immune tumor microenvironment and the substrates of PCs could contribute to the development of new and necessary immunotherapies to treat this pathology. Abstract Testicular Germ Cell Tumours (TGCT) are widely considered a “curable cancer” due to their exceptionally high survival rate, even if it is reduced by many years after the diagnosis due to metastases and relapses. The most common therapeutic approach to TGCTs has not changed in the last 50 years despite its multiple long-term side effects, and because it is the most common malignancy in young Caucasian men, much research is needed to better the quality of life of the many survivors. Proprotein Convertases (PC) are nine serine proteases responsible for the maturation of inactive proproteins with many diverse functions. Alterations in their expression have been associated with various diseases, including cancer and inflammation. Many of their substrates are adhesion molecules, metalloproteases and proinflammatory molecules, all of which are involved in tumour development. Inhibition of certain convertases has also been shown to slow tumour formation, demonstrating their involvement in this process. Considering the very established link between PCs and inflammation-related malignancies and the recent studies carried out into the immune microenvironment of TGCTs, the study of the involvement of PCs in testicular cancer may open up avenues for being both a biomarker for diagnosis and a therapeutic target.
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Xiong W, Shen C, Wang Z. The molecular mechanisms underlying acrosome biogenesis elucidated by gene-manipulated mice. Biol Reprod 2021; 105:789-807. [PMID: 34131698 DOI: 10.1093/biolre/ioab117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/04/2021] [Accepted: 06/09/2021] [Indexed: 02/05/2023] Open
Abstract
Sexual reproduction requires the fusion of two gametes in a multistep and multifactorial process termed fertilization. One of the main steps that ensures successful fertilization is acrosome reaction. The acrosome, a special kind of organelle with a cap-like structure that covers the anterior portion of sperm head, plays a key role in the process. Acrosome biogenesis begins with the initial stage of spermatid development, and it is typically divided into four successive phases: the Golgi phase, cap phase, acrosome phase, and maturation phase. The run smoothly of above processes needs an active and specific coordination between the all kinds of organelles (endoplasmic reticulum, trans-golgi network and nucleus) and cytoplasmic structures (acroplaxome and manchette). During the past two decades, an increasingly genes have been discovered to be involved in modulating acrosome formation. Most of these proteins interact with each other and show a complicated molecular regulatory mechanism to facilitate the occurrence of this event. This Review focuses on the progresses of studying acrosome biogenesis using gene-manipulated mice and highlights an emerging molecular basis of mammalian acrosome formation.
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Affiliation(s)
- Wenfeng Xiong
- State Key Laboratory of Medical Genomics, Research Center for Experimental Medicine, Rui-Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Chunling Shen
- State Key Laboratory of Medical Genomics, Research Center for Experimental Medicine, Rui-Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Zhugang Wang
- State Key Laboratory of Medical Genomics, Research Center for Experimental Medicine, Rui-Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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5
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Dysregulation of the Acrosome Formation Network by 8-oxoguanine (8-oxoG) in Infertile Sperm: A Case Report with Advanced Techniques. Int J Mol Sci 2021; 22:ijms22115857. [PMID: 34070710 PMCID: PMC8199233 DOI: 10.3390/ijms22115857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 12/17/2022] Open
Abstract
8-Hydroxyguanine (8-oxoG) is the most common oxidative DNA lesion and unrepaired 8-oxoG is associated with DNA fragmentation in sperm. However, the molecular effects of 8-oxoG on spermatogenesis are not entirely understood. Here, we identified one infertile bull (C14) due to asthenoteratozoospermia. We compared the global concentration of 8-oxoG by reverse-phase liquid chromatography/mass spectrometry (RP-LC/MS), the genomic distribution of 8-oxoG by next-generation sequencing (OG-seq), and the expression of sperm proteins by 2-dimensional polyacrylamide gel electrophoresis followed by peptide mass fingerprinting (2D-PAGE/PMF) in the sperm of C14 with those of a fertile bull (C13). We found that the average levels of 8-oxoG in C13 and C14 sperm were 0.027% and 0.044% of the total dG and it was significantly greater in infertile sperm DNA (p = 0.0028). Over 81% of the 8-oxoG loci were distributed around the transcription start site (TSS) and 165 genes harboring 8-oxoG were exclusive to infertile sperm. Functional enrichment and network analysis revealed that the Golgi apparatus was significantly enriched with the products from 8-oxoG genes of infertile sperm (q = 2.2 × 10−7). Proteomic analysis verified that acrosome-related proteins, including acrosin-binding protein (ACRBP), were downregulated in infertile sperm. These preliminary results suggest that 8-oxoG formation during spermatogenesis dysregulated the acrosome-related gene network, causing structural and functional defects of sperm and leading to infertility.
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Khawar MB, Gao H, Li W. Mechanism of Acrosome Biogenesis in Mammals. Front Cell Dev Biol 2019; 7:195. [PMID: 31620437 PMCID: PMC6759486 DOI: 10.3389/fcell.2019.00195] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 08/29/2019] [Indexed: 11/13/2022] Open
Abstract
During sexual reproduction, two haploid gametes fuse to form the zygote, and the acrosome is essential to this fusion process (fertilization) in animals. The acrosome is a special kind of organelle with a cap-like structure that covers the anterior portion of the head of the spermatozoon. The acrosome is derived from the Golgi apparatus and contains digestive enzymes. With the progress of our understanding of acrosome biogenesis, a number of models have been proposed to address the origin of the acrosome. The acrosome has been regarded as a lysosome-related organelle, and it has been proposed to have originated from the lysosome or the autolysosome. Our review will provide a brief historical overview and highlight recent findings on acrosome biogenesis in mammals.
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Affiliation(s)
- Muhammad Babar Khawar
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hui Gao
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Wei Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
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7
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Wang M, Liu X, Chang G, Chen Y, An G, Yan L, Gao S, Xu Y, Cui Y, Dong J, Chen Y, Fan X, Hu Y, Song K, Zhu X, Gao Y, Yao Z, Bian S, Hou Y, Lu J, Wang R, Fan Y, Lian Y, Tang W, Wang Y, Liu J, Zhao L, Wang L, Liu Z, Yuan R, Shi Y, Hu B, Ren X, Tang F, Zhao XY, Qiao J. Single-Cell RNA Sequencing Analysis Reveals Sequential Cell Fate Transition during Human Spermatogenesis. Cell Stem Cell 2018; 23:599-614.e4. [PMID: 30174296 DOI: 10.1016/j.stem.2018.08.007] [Citation(s) in RCA: 265] [Impact Index Per Article: 44.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 06/08/2018] [Accepted: 08/09/2018] [Indexed: 11/19/2022]
Abstract
Spermatogenesis generates mature male gametes and is critical for the proper transmission of genetic information between generations. However, the developmental landscapes of human spermatogenesis remain unknown. Here, we performed single-cell RNA sequencing (scRNA-seq) analysis for 2,854 testicular cells from donors with normal spermatogenesis and 174 testicular cells from one nonobstructive azoospermia (NOA) donor. A hierarchical model was established, which was characterized by the sequential and stepwise development of three spermatogonia subtypes, seven spermatocyte subtypes, and four spermatid subtypes. Further analysis identified several stage-specific marker genes of human germ cells, such as HMGA1, PIWIL4, TEX29, SCML1, and CCDC112. Moreover, we identified altered gene expression patterns in the testicular somatic cells of one NOA patient via scRNA-seq analysis, paving the way for further diagnosis of male infertility. Our work allows for the reconstruction of transcriptional programs inherent to sequential cell fate transition during human spermatogenesis and has implications for deciphering male-related reproductive disorders.
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Affiliation(s)
- Mei Wang
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Xixi Liu
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Gang Chang
- Guangdong Key Laboratory of Genome Instability and Human Disease Prevention, Department of Biochemistry and Molecular Biology, Shenzhen University Health Science Center, Shenzhen, Guangdong 518060, PRC
| | - Yidong Chen
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, PRC
| | - Geng An
- Reproductive Medicine Center of The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, PRC
| | - Liying Yan
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Shuai Gao
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yanwen Xu
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Yueli Cui
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Ji Dong
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yuhan Chen
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Xiaoying Fan
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yuqiong Hu
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, PRC
| | - Ke Song
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Xiaohui Zhu
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yun Gao
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Zhaokai Yao
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Shuhui Bian
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, PRC
| | - Yu Hou
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Jiahao Lu
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Rui Wang
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yong Fan
- Reproductive Medicine Center of The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, PRC
| | - Ying Lian
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Wenhao Tang
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yapeng Wang
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Jianqiao Liu
- Reproductive Medicine Center of The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, PRC
| | - Lianming Zhao
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Luyu Wang
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Zhaoting Liu
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Renpei Yuan
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Yujia Shi
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC
| | - Boqiang Hu
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Xiulian Ren
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC
| | - Fuchou Tang
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing 100191, PRC; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, PRC.
| | - Xiao-Yang Zhao
- Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, PRC; Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Southern Medical University, Guangdong 510515, PRC.
| | - Jie Qiao
- Department of Obstetrics and Gynecology, Beijing Advanced Innovation Center for Genomics, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, PRC; Biomedical Pioneering Innovation Center and Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, PRC; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, PRC.
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Identification of sperm mRNA biomarkers associated with testis injury during preclinical testing of pharmaceutical compounds. Toxicol Appl Pharmacol 2017; 320:1-7. [PMID: 28167222 DOI: 10.1016/j.taap.2017.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 01/03/2017] [Accepted: 02/03/2017] [Indexed: 12/30/2022]
Abstract
The human testis is sensitive to toxicant-induced injury but current methods for detecting adverse effects are limited, insensitive and unreliable. Animal studies use sensitive histopathological endpoints to assess toxicity, but require testicular tissue that is not available during human clinical trials. More sensitive and reliable molecular biomarkers of testicular injury are needed to better monitor testicular toxicity in both clinical and preclinical. Adult male Wistar Han rats were exposed for 4weeks to compounds previously associated with testicular injury, including cisplatin (0, 0.2, 0.3, or 0.4mg/kg/day), BI665915 (0, 20, 70, 100mg/kg/d), BI665636 (0, 20, 100mg/kg/d) or BI163538 (0, 70, 150, 300mg/kg/d) to evaluate reproductive toxicity and assess changes in sperm mRNA levels. None of the compounds resulted in any significant changes in body, testis or epididymis weights, nor were there decreases in testicular homogenization resistant spermatid head counts. Histopathological evaluation found that only BI665915 treatment caused any testicular effects, including minor germ cell loss and disorganization of the seminiferous tubule epithelium, and an increase in the number of retained spermatid heads. A custom PCR-array panel was used to assess induced changes in sperm mRNA. BI665915 treatment resulted in a significant increase in clusterin (Clu) levels and decreases in GTPase, IMAP family member 4 (Gimap4), prostaglandin D2 synthase (Ptgds) and transmembrane protein with EGF like and two follistatin like domains 1 (Tmeff1) levels. Correlation analysis between transcript levels and quantitative histopathological endpoints found a modest association between Clu with retained spermatid heads. These results demonstrate that sperm mRNA levels are sensitive molecular indicators of testicular injury that can potentially be translated into a clinical setting.
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El-Taieb MA, Ali MA, Nada EA. Oxidative stress and acrosomal morphology: A cause of infertility in patients with normal semen parameters. MIDDLE EAST FERTILITY SOCIETY JOURNAL 2015. [DOI: 10.1016/j.mefs.2014.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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10
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Kumar A, Dumasia K, Gaonkar R, Sonawane S, Kadam L, Balasinor NH. Estrogen and androgen regulate actin-remodeling and endocytosis-related genes during rat spermiation. Mol Cell Endocrinol 2015; 404:91-101. [PMID: 25637714 DOI: 10.1016/j.mce.2014.12.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 11/26/2014] [Accepted: 12/17/2014] [Indexed: 12/22/2022]
Abstract
Spermiation, the sperm release process, is imperative to male fertility and reproduction. Morphologically, it is characterized by removal of atypical adherens junctions called ectoplasmic specializations, and formation of transient endocytic devices called tubulobulbar complexes requiring cytoskeleton remodeling and recruitment of proteins needed for endocytosis. Earlier, estrogen administration to adult male rats was seen to cause spermiation failure due to disruption of tubulobulbar complexes. This was accompanied by reduction in intratesticular testosterone levels and increase in intratesticular estrogen along with deregulation of genes involved in cytoskeleton remodeling (Arpc1b, Evl and Capg) and endocytosis (Picalm, Eea1 and Stx5a). In the present study, we aim to understand the role of estrogen and androgen in regulating these genes independently using seminiferous tubule culture system treated with estrogen, androgen or agonists and antagonists of estrogen receptors. We find that transcripts of Arpc1b, Evl and Picalm are responsive to estrogen while those of Picalm, Eea1 and Stx5a are responsive to androgen. We also find that the estrogen regulation of Arpc1b and Evl is mediated through estrogen receptor β and that of Picalm occurs through estrogen receptors α and β. Localization of these proteins at or in the vicinity of tubulobulbar complexes reveals that ARPC1B, EVL, PICALM, EEA1 and STX5A seem to be involved in spermiation. Thus, estrogen and androgen regulate specific genes in seminiferous tubules that could play a role in spermiation.
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Affiliation(s)
- Anita Kumar
- Deparment of Neuroendocrinology, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India
| | - Kushaan Dumasia
- Deparment of Neuroendocrinology, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India
| | - Reshma Gaonkar
- Confocal Facility, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India
| | - Shobha Sonawane
- Confocal Facility, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India
| | - Leena Kadam
- Deparment of Neuroendocrinology, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India
| | - N H Balasinor
- Deparment of Neuroendocrinology, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Parel, Mumbai 400012, India.
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11
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Yasuno Y, Kawano JI, Inoue YH, Yamamoto MT. Distribution and morphological changes of the Golgi apparatus during Drosophila spermatogenesis. Dev Growth Differ 2013; 55:635-47. [PMID: 23855356 DOI: 10.1111/dgd.12070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 05/19/2013] [Accepted: 05/20/2013] [Indexed: 12/01/2022]
Abstract
In spermatogenesis, the Golgi apparatus is important for the formation of the acrosome, which is a sperm-specific organelle essential for fertilization. Comprehensive examinations of the spatiotemporal distribution and morphological characterizations of the Golgi in various cells during spermatogenesis are necessary for functional analyses and mutant screenings in the model eukaryote Drosophila. Here, we examined the distribution and morphology of the Golgi during Drosophila spermatogenesis with immunofluorescence and electron microscopy. In pre-meiotic germ cells, the Golgi apparatuses were distributed evenly in the cytoplasm. In contrast, they were located exclusively in two regions near the poles during the meiotic metaphase, where they were segregated prior to the chromosomes. In cells in anaphase to telophase, the Golgi were predominantly left behind in the equatorial region between the separating daughter nuclei. After completion of meiosis, the dispersed Golgi were assembled at the apical side of the spermatid nucleus to form the acrosome. Further investigation of the Golgi distribution in β2-tubulin mutants showed aberrant and uneven distributions of the Golgi among sister cells in the meiotic spermatocytes and in the post-meiotic spermatids. At the ultrastructural level, the Golgi apparatus in pre-meiotic spermatocytes comprised a pair of stacks. The two stacks were situated adjacent to each other, as if they had duplicated before entering into meiotic division. These results highlight the dynamic nature of the Golgi during spermatogenesis and provide a framework for analyzing the correlations between the dynamics of the Golgi and its function in sperm development.
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Affiliation(s)
- Yusaku Yasuno
- Drosophila Genetic Resource Center, Kyoto Institute of Technology, Saga-Ippongi-cho, Ukyo-ku, Kyoto, Japan.
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12
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Alvarez Sedo C, Rawe VY, Chemes HE. Acrosomal biogenesis in human globozoospermia: immunocytochemical, ultrastructural and proteomic studies. Hum Reprod 2012; 27:1912-21. [DOI: 10.1093/humrep/des126] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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García L, Veiga MF, Lustig L, Vazquez-Levin MH, Veaute C. DNA Immunization Against Proacrosin Impairs Fertility in Male Mice. Am J Reprod Immunol 2012; 68:56-67. [DOI: 10.1111/j.1600-0897.2012.01127.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 02/19/2012] [Indexed: 11/28/2022] Open
Affiliation(s)
- Lucila García
- Facultad de Bioquímica y Ciencias Biológicas; Universidad Nacional del Litoral; Ciudad Universitaria; Santa Fe; Argentina
| | - María F. Veiga
- Instituto de Biología y Medicina Experimental (IBYME); National Research Council of Argentina (CONICET); Buenos Aires; Argentina
| | - Livia Lustig
- Instituto de Investigaciones en Reproducción; Facultad de Medicina; Universidad de Buenos Aires; Buenos Aires; Argentina
| | - Mónica H. Vazquez-Levin
- Instituto de Biología y Medicina Experimental (IBYME); National Research Council of Argentina (CONICET); Buenos Aires; Argentina
| | - Carolina Veaute
- Facultad de Bioquímica y Ciencias Biológicas; Universidad Nacional del Litoral; Ciudad Universitaria; Santa Fe; Argentina
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14
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Hermo L, Pelletier RM, Cyr DG, Smith CE. Surfing the wave, cycle, life history, and genes/proteins expressed by testicular germ cells. Part 2: changes in spermatid organelles associated with development of spermatozoa. Microsc Res Tech 2010; 73:279-319. [PMID: 19941292 DOI: 10.1002/jemt.20787] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Spermiogenesis is a long process whereby haploid spermatids derived from the meiotic divisions of spermatocytes undergo metamorphosis into spermatozoa. It is subdivided into distinct steps with 19 being identified in rats, 16 in mouse and 8 in humans. Spermiogenesis extends over 22.7 days in rats and 21.6 days in humans. In this part, we review several key events that take place during the development of spermatids from a structural and functional point of view. During early spermiogenesis, the Golgi apparatus forms the acrosome, a lysosome-like membrane bound organelle involved in fertilization. The endoplasmic reticulum undergoes several topographical and structural modifications including the formation of the radial body and annulate lamellae. The chromatoid body is fully developed and undergoes structural and functional modifications at this time. It is suspected to be involved in RNA storing and processing. The shape of the spermatid head undergoes extensive structural changes that are species-specific, and the nuclear chromatin becomes compacted to accommodate the stream-lined appearance of the sperm head. Microtubules become organized to form a curtain or manchette that associates with spermatids at specific steps of their development. It is involved in maintenance of the sperm head shape and trafficking of proteins in the spermatid cytoplasm. During spermiogenesis, many genes/proteins have been implicated in the diverse dynamic events occurring at this time of development of germ cells and the absence of some of these have been shown to result in subfertility or infertility.
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Affiliation(s)
- Louis Hermo
- Faculty of Medicine, Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada H3A 2B2.
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15
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Li S, Qiao Y, Di Q, Le X, Zhang L, Zhang X, Zhang C, Cheng J, Zong S, Koide SS, Miao S, Wang L. Interaction of SH3P13 and DYDC1 protein: a germ cell component that regulates acrosome biogenesis during spermiogenesis. Eur J Cell Biol 2009; 88:509-20. [PMID: 19545932 DOI: 10.1016/j.ejcb.2009.05.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 04/19/2009] [Accepted: 05/05/2009] [Indexed: 01/15/2023] Open
Abstract
The N-terminal BAR domain of endophilin has unique functions, such as affecting the curvature of the lipid membrane through its lysophosphatidic acid acyltransferase activity, binding of ATP and GTP and participating in tubulating activity. We recently demonstrated that SH3P13, a BAR domain-containing protein, assists in regulating clathrin-coated vesicle traffic that is crucial for acrosome biogenesis during spermatogenesis. DYDC1 was identified in a yeast two-hybrid screen from a human testis library by using the SH3P13 BAR domain as the bait. Consistent with the expression pattern of SH3P13, DYDC1 is exclusively expressed in the brain and testis and accumulates in the acrosome area during late stage of spermiogenesis. Here, we report that DYDC1 plays a crucial role during acrosome biogenesis. This relationship has been verified by a novel approach that involves germ cell transplantation and RNA interference. We found that knockdown of endogenous Dydc1 interfered with the formation of acrosomes, and thus spermatid differentiation during mouse spermiogenesis. These data provide important insight into the crucial process of acrosome biogenesis. In addition, our approach can also be applied to study functions of other genes related to spermatogenesis in vivo.
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Affiliation(s)
- Shuchun Li
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, China
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16
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Valbuena G, Hernández F, Madrid JF, Sáez FJ. Acrosome biosynthesis in spermatocytes and spermatids revealed by HPA lectin cytochemistry. Anat Rec (Hoboken) 2008; 291:1097-105. [PMID: 18521902 DOI: 10.1002/ar.20721] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The origin of the acrosome is controversial, because of both its lysosomal nature and at the moment of its appearance, which seems to be species-specific. Considering the amazing organization shown by the acrosome of some urodele amphibians, HPA-colloidal gold cytochemistry was used to analyze the biogenesis of the acrosome in the urodele Pleurodeles waltl at electron microscopy level. The results showed that HPA-labeling is useful to label the acrosome and its precursor vesicles and, consequently, HPA-histochemistry could be used as a marker of acrosomal content. Labeling of the Golgi apparatus and precursor vesicles was seen in primary spermatocytes and round (stage I) spermatids, thus contributing solid evidence for the beginning of acrosome biogenesis before meiosis. In both primary spermatocytes and round spermatids, an enigmatic vesicle, probably related to the biosynthesis of the neck piece or the tail, was also labeled. Labeling in elongating spermatids (stage II-IV), showed a homogeneous distribution of colloidal gold particles in the acrosomal cap, but the perforatorium was not positive to the lectin. However, in mature (stage V-VI) spermatids, a regional distribution of labeling in the acrosome was seen, with the apical knob showing a stronger labeling than the lateral barb, and the lateral barb showing a stronger labeling than the principal piece of the acrosomal cap. This regional distribution of the labeling suggests that the acrosome develops several domains with different glycoconjugate compositions.
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Affiliation(s)
- Galder Valbuena
- University of the Basque Country, Department of Cell Biology and Histology, School of Medicine and Dentistry, Leioa (Vizcaya), Spain
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17
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Moreno RD, Palomino J, Schatten G. Assembly of spermatid acrosome depends on microtubule organization during mammalian spermiogenesis. Dev Biol 2006; 293:218-27. [PMID: 16540102 DOI: 10.1016/j.ydbio.2006.02.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2005] [Revised: 01/31/2006] [Accepted: 02/02/2006] [Indexed: 11/22/2022]
Abstract
The acrosome is a secretory vesicle attached to the nucleus of the sperm. Our hypothesis is that microtubules participate in the membrane traffic between the Golgi apparatus and acrosome during the first steps of spermatid differentiation. In this work, we show that nocodazole-induced microtubule depolarization triggers the formation of vesicles of the acrosomal membrane, without detaching the acrosome from the nuclear envelope. Nocodazole also induced fragmentation of the Golgi apparatus as determined by antibodies against giantin, golgin-97 and GM130, and electron microscopy. Conversely, neither the acrosome nor the Golgi apparatus underwent fragmentation in elongating spermatids (acrosome- and maturation-phase). The microtubule network of round spermatids of azh/azh mice also became disorganized. Disorganization correlated with fragmentation of the acrosome and the Golgi apparatus, as evaluated by domain-specific markers. Elongating spermatids (acrosome and maturation-phase) of azh/azh mice also had alterations in microtubule organization, acrosome, and Golgi apparatus. Finally, the spermatozoa of azh/azh mice displayed aberrant localization of the acrosomal protein sp56 in both the post-acrosomal and flagellum domains. Our results suggest that microtubules participate in the formation and/or maintenance of the structure of the acrosome and the Golgi apparatus and that the organization of the microtubules in round spermatids is key to sorting acrosomal proteins to the proper organelle.
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Affiliation(s)
- Ricardo D Moreno
- Unit of Reproduction and Developmental Biology, Physiology Department, Faculty of Biological Sciences, Pontifical Catholic University of Chile, Portugal 49-Santiago 340-213, Chile.
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18
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Milazzo JP, Rives N, Mousset-Siméon N, Macé B. Chromosome constitution and apoptosis of immature germ cells present in sperm of two 47,XYY infertile males. Hum Reprod 2006; 21:1749-58. [PMID: 16497695 DOI: 10.1093/humrep/del051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND In order to assess sperm alterations observed in some XYY males, we analysed the chromosome constitution as well as apoptosis expression in germ cells from two oligozoospermic males with high count of immature germ cells in their semen. METHODS Sex chromosome number and distribution were assessed at pachytene stage by fluorescence in situ hybridization (FISH). Immature germ cells and spermatozoa were examined by FISH and TdT (terminal deoxynucleotidyl transferase)-mediated dUDP nick-end (TUNEL) assay, combined with immunocytochemistry using the proacrosin-specific monoclonal antibody (mAb 4D4). RESULTS For patients 1 and 2, two Y chromosomes were present in respectively 60.0 and 39.6% of pachytenes. The three sex chromosomes were always in close proximity and partially or totally condensed in a sex body. XYY spermatocytes I escape the pachytene checkpoint and achieve meiosis. Nevertheless, nuclear division and/or cytokinesis were often impaired during meiosis leading to diploid (mainly 47,XYY cells) and tetraploid (94,XXYYYY) meiocytes. The presence of binucleated (23,Y)(24,XY) immature germ cells resulting from cytokinesis failure agree with a preferential segregation of the two Y chromosomes during meiosis I. In addition, 69.6% (patient 1) and 53.12% (patient 2) of post-reductional round germ cells were XY. However, high level of apoptotic round germ cells (94.9% for patient 1 and 93.3% for patient 2) was detected and may explain the moderate increase of hyperhaploid XY spermatozoa. Segregation errors also occurred in the XY cell line responsible for disomic 18 and X, as well as 46,XY diploid spermatozoa. CONCLUSIONS Our data are in agreement with the persistence of the extra Y chromosome during meiosis in XYY oligozoospermic males responsible for spermatogenesis impairment and a probable elimination via apoptosis of most XYY germ cells not solely during but also after meiosis.
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Affiliation(s)
- J P Milazzo
- Reproductive Biology Laboratory - CECOS, Rouen University Hospital, Rouen, France
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19
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Rives N, Milazzo JP, Miraux L, North MO, Sibert L, Macé B. From spermatocytes to spermatozoa in an infertile XYY male. ACTA ACUST UNITED AC 2005; 28:304-10. [PMID: 16128991 DOI: 10.1111/j.1365-2605.2005.00540.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Sex chromosome distribution and aneuploidy as well as germ cell degeneration were evaluated in meiotic and post-meiotic cells from an infertile XYY male. Sex chromosome distribution was assessed by multicolour fluorescence in situ hybridization on meiotic preparations. Post-meiotic cell aneuploidy was characterized by a method combining multicolour fluorescence in situ hybridization and immunocytochemistry using the proacrosin-specific monoclonal antibody (mAb 4D4). TUNEL assay was carried out on seminiferous tubules to evaluate germ cell degeneration. At the prophase stage of the first meiotic division, 63.64% of cells at the pachytene stage carried three sex chromosomes. The ratio of X-bearing to Y-bearing spermatids and spermatozoa differed significantly from 1 : 1 with an excess of Y-bearing spermatids and spermatozoa. The frequency of hyperhaploid XY spermatids was increased in the XYY male, as well as the incidence of YY, XY and disomic 18 ejaculated spermatozoa. A preferential elimination of germ cells by apoptosis occurred in spermatocytes I. The persistence of the extra Y chromosome during meiosis of an XYY male is associated with a high rate of spermatocyte I degeneration and a low rate of aneuploid spermatozoa.
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Affiliation(s)
- Nathalie Rives
- Laboratoire de Biologie de la Reproduction, CECOS, Rouen, France.
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20
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Peknicova J, Chladek D, Hozak P. Monoclonal Antibodies against Sperm Intra-acrosomal Antigens as Markers for Male Infertility Diagnostics and Estimation of Spermatogenesis. Am J Reprod Immunol 2005; 53:42-9. [PMID: 15667524 DOI: 10.1111/j.1600-0897.2004.00245.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
PROBLEM To determine the ability of monoclonal antibodies (MoAbs) against acrosomal antigens to detect physiology and pathology of human spermatozoa and to detect spermatids in ejaculates of infertile male with azoospermia. METHOD OF STUDY Sperm antigens detected with prepared MoAbs were partially characterized by biochemical and immunocytochemical methods. The acrosomal status of spermatozoa was compared in men with normal and pathological spermiograms and in sperm before and after induced acrosome reaction (AR). Ejaculates from patients were tested for the presence of spermatids. RESULTS MoAbs specifically bind to intra-acrosomal sperm antigens with quantitative difference between ejaculates with normal and pathological spermiograms. These antigens are released from the acrosome after induced AR. MoAbs labeled acrosomal proteins in round and elongated spermatids in the ejaculates of patients with azoospermia. CONCLUSION MoAbs against intra-acrosomal sperm antigens are useful for human sperm diagnosis and prediction of spermatogenesis. The spermatids can be utilized in assisted reproduction.
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Affiliation(s)
- Jana Peknicova
- Department of Biology and Biochemistry of Fertilization, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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21
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Ramalho-Santos J, Schatten G, Moreno RD. Control of membrane fusion during spermiogenesis and the acrosome reaction. Biol Reprod 2003; 67:1043-51. [PMID: 12297516 DOI: 10.1095/biolreprod67.4.1043] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Membrane fusion is important to reproduction because it occurs in several steps during the process of fertilization. Many events of intracellular trafficking occur during both spermiogenesis and oogenesis. The acrosome reaction, a key feature during mammalian fertilization, is a secretory event involving the specific fusion of the outer acrosomal membrane and the sperm plasma membrane overlaying the principal piece of the acrosome. Once the sperm has crossed the zona pellucida, the gametes fuse, but in the case of the sperm this process takes place through a specific membrane domain in the head, the equatorial segment. The cortical reaction, a process that prevents polyspermy, involves the exocytosis of the cortical granules to the extracellular milieu. In lower vertebrates, the formation of the zygotic nucleus involves the fusion (syngamia) of the male pronucleus with the female pronucleus. Other undiscovered membrane trafficking processes may also be relevant for the formation of the zygotic centrosome or other zygotic structures. In this review, we focus on the recent discovery of molecular machinery components involved in intracellular trafficking during mammalian spermiogenesis, notably related to acrosome biogenesis. We also extend our discussion to the molecular mechanism of membrane fusion during the acrosome reaction. The data available so far suggest that proteins participating in the intracellular trafficking events leading to the formation of the acrosome during mammalian spermiogenesis are also involved in controlling the acrosome reaction during fertilization.
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Affiliation(s)
- João Ramalho-Santos
- Unit of Reproduction and Development, Physiology Department, Pontifical Catholic University of Chile, 340-213 Santiago, Chile
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Tesarik J, Nagy P, Abdelmassih R, Greco E, Mendoza C. Pharmacological concentrations of follicle-stimulating hormone and testosterone improve the efficacy of in vitro germ cell differentiation in men with maturation arrest. Fertil Steril 2002; 77:245-51. [PMID: 11821079 DOI: 10.1016/s0015-0282(01)02969-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To examine whether in vitro differentiation of germ cells from men with maturation arrest is improved by augmenting FSH and T concentrations above the values effective in samples from men with normal spermatogenesis. DESIGN Prospective, controlled in vitro study. SETTING Private assisted reproduction centers and a university department. PATIENT(S) Men with meiotic or postmeiotic maturation arrest. INTERVENTION(S) Testicular spermatid extraction, in vitro culture of testicular biopsy samples, intraoocyte injection of elongated spermatids, embryo culture and transfer. MAIN OUTCOME MEASURE(S) Progression of in vitro germ cell differentiation, fertilization, and pregnancy outcomes with in vitro cultured germ cells. RESULT(S) In some cases of meiotic and postmeiotic maturation arrest, more advanced germ cell stages were achieved by in vitro culture in the presence of 500 IU/L FSH as compared with 50 IU/L FSH. The beneficial effect of 500 IU/L FSH was further potentiated by a simultaneous increase of T concentration from 1 to 10 microM. Fertilizations with germ cells recovered after incubation with these pharmacological hormone concentrations gave rise to viable embryos and the births of five healthy babies. CONCLUSION(S) Pharmacological concentrations of FSH and T are beneficial for in vitro maturation of germ cells from some men with in vivo maturation arrest.
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Abstract
In mice, transplantation of spermatogonial stem cells from a fertile male to the seminiferous tubules of an infertile recipient male results in progeny with donor-derived haplotype. Attempts to extend this approach by transplanting human testis cells to mice have led to conflicting claims that no donor germ cells persisted or that human spermatozoa were produced in the recipient. To examine this issue we used the baboon, a primate in which testis cell populations of several ages could be obtained for transplantation, and demonstrate that donor spermatogonial stem cells readily establish germ cell colonies in recipient mice, which exist for periods of at least 6 mo. However, differentiation of germ cells toward the lumen of the tubule and production of spermatozoa did not occur. The presence of baboon spermatogonial stem cells and undifferentiated spermatogonia in mouse seminiferous tubules for long periods after transplantation indicates that antigens, growth factors, and signaling molecules that are necessary for interaction of these cells and the testis environment have been preserved for 100 million years of evolutionary separation. Because germ cell differentiation and spermatogenesis did not occur, the molecules necessary for this process appear to have undergone greater divergence between baboon and mouse.
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Affiliation(s)
- M Nagano
- Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104-6009, USA
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24
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Abstract
Previously, we identified the guinea pig sperm acrosomal matrix glycoprotein AM67 and demonstrated that it is most closely related to mouse sperm sp56, initially reported to be a cell-surface protein. On the contrary, our studies demonstrated that sp56 is an intra-acrosomal component. Based upon the homology between guinea pig AM67 and mouse sp56, we hypothesized that sp56 was part of the acrosomal matrix, a structure that had yet to be demonstrated to exist in mouse sperm. In this paper, we show that sp56 first appeared in late meiotic cells and accumulated during spermiogenesis, the haploid stage of spermatogenic cell development. Using affinity-purified anti-peptide antisera, we determined that the molecular weight of sp56 in cauda epididymal sperm approximated that of guinea pig AM67 ( approximately 67 000 M:(r)) and that sp56 was present in a high molecular weight, disulfide-linked complex. The forms of sp56 in pachytene spermatocytes and spermatids had higher molecular weights than was found for the sperm form; the size differences were apparently due to alterations in carbohydrate side chains. The sp56 complex could not be solubilized by the nonionic detergent Triton X-100 but remained associated with the dorsal surface of the mouse sperm head, demonstrating that sp56 is a component of the mouse sperm acrosomal matrix.
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Affiliation(s)
- K S Kim
- Center for Research on Reproduction and Women's Health and Department of Obstetrics and Gynecology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104-6142, USA
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Tesarik J, Mendoza C, Greco E. Immature germ cell conception-in vitro germ cell manipulation. BAILLIERE'S BEST PRACTICE & RESEARCH. CLINICAL ENDOCRINOLOGY & METABOLISM 2000; 14:437-52. [PMID: 11097785 DOI: 10.1053/beem.2000.0090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Experimental studies in laboratory animals have shown that successful conception can be achieved by fertilizing oocytes with immature male germ cells. This gave rise to the concept that immature germ cells recovered from the testes of azoospermic men with maturation arrest may be used for assisted reproduction. However, in contrast to using germ cells recovered from healthy animals, clinical application to the treatment of male sterility is burdened by inherent defects in germ cells attributable to underlying testicular pathology. The recent introduction of in vitro germ cell culture/manipulation techniques makes it possible, in some cases, to overcome the in vivo maturation arrest by allowing an additional meiotic and post-meiotic differentiation and the selective harvesting of cells devoid of apoptosis-related nuclear and cytoplasmic damage. These techniques enabled the first births of normal infants fathered by azoospermic men with maturation arrest at the primary spermatocyte stage and improved the efficacy of assisted reproduction in men with maturation arrest at the round spermatid stage.
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Affiliation(s)
- J Tesarik
- Laboratoire d'Eylau, 55 rue Saint Didier, 75116 Paris, France
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26
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Abstract
Both meiotic and postmeiotic maturation events have been observed to occur in human male germ cells during in-vitro culture. The temperature of 30 degrees C, medium supplementation with follicle-stimulating hormone and testosterone and the maintenance of the original cell-cell associations within explanted segments of the testicular seminiferous tubules are common features of the most efficient culture systems. The in-vitro maturation processes are markedly accelerated as compared to the in-vivo situation, probably due to the abrogation of a checkpoint controlling the full assembly of molecules needed for spermiogenesis. Moreover, both meiotic and postmeiotic maturation processes can be reactivated in vitro in some cases with a complete block of the same processes in vivo. Healthy babies were born after micromanipulation-assisted fertilization with in-vitro matured elongated spermatids from men with complete in-vivo maturation arrest at the round spermatid stage and at the primary spermatocyte stage.
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Affiliation(s)
- J Tesarik
- Laboratoire d'Eylau, 55 rue Saint-Didier, 75116, Paris, France
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Moreno RD, Ramalho-Santos J, Sutovsky P, Chan EK, Schatten G. Vesicular traffic and golgi apparatus dynamics during mammalian spermatogenesis: implications for acrosome architecture. Biol Reprod 2000; 63:89-98. [PMID: 10859246 DOI: 10.1095/biolreprod63.1.89] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Vesicular membrane trafficking during acrosome biogenesis in bull and rhesus monkey spermatogenesis differs from the somatic cell paradigm as imaged dynamically using the Golgi apparatus probes beta-COP, giantin, Golgin-97, and Golgin-95/GM130. In particular, sorting and delivery of proteins seemed less precise during spermatogenesis. In early stages of spermiogenesis, many Golgi resident proteins and specific acrosomal markers were present in the acrosome. Trafficking in both round and elongating spermatids was similar to what has been described for somatic cells, as judged by the kinetics of Golgi protein incorporation into endoplasmic reticulum-like structures after brefeldin A treatment. These Golgi components were retrieved from the acrosome at later stages of differentiation and were completely devoid of immature spermatozoa. Our data suggest that active anterograde and retrograde vesicular transport trafficking pathways, involving both beta-COP- and clathrin-coated vesicles, are involved in retrieving Golgi proteins missorted to the acrosome and in controlling the growth and shape of this organelle.
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Affiliation(s)
- R D Moreno
- Oregon Regional Primate Research Center, Beaverton, Oregon 97006, USA
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28
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Tesarik J, Mendoza C, Greco E. In vitro culture facilitates the selection of healthy spermatids for assisted reproduction. Fertil Steril 1999; 72:809-13. [PMID: 10560982 DOI: 10.1016/s0015-0282(99)00379-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To evaluate the potential usefulness of in vitro culture of germ cells for distinguishing between healthy and apoptotic spermatids. DESIGN Prospective study. SETTING Private assisted reproduction laboratories and a university department. PATIENT(S) Men with secretory azoospermia who were candidates for assisted reproductive treatment. INTERVENTION(S) Testicular biopsy samples were cultured in the presence of FSH and testosterone for 48 hours. Germ cell apoptosis before and after culture was evaluated by terminal deoxyribonucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling. MAIN OUTCOME MEASURE(S) The percentage of germ cells at different stages of spermatogenesis that showed apoptosis-related DNA damage. RESULT(S) In fresh samples, high levels of apoptosis were detected at those stages of spermatogenesis at which major developmental blocks occurred, with a maximum at the most advanced stage detected. In contrast, apoptotic cells were considerably less well represented at the most advanced stage after culture. CONCLUSION(S) In addition to the previously described facilitation of spermatid recognition and the progression of cytoplasmic maturation, in vitro culture of germ cells is useful to overcome the danger of inadvertent use of apoptotic spermatids for assisted reproduction.
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Tesarik J, Guido M, Mendoza C, Greco E. Human spermatogenesis in vitro: respective effects of follicle-stimulating hormone and testosterone on meiosis, spermiogenesis, and Sertoli cell apoptosis. J Clin Endocrinol Metab 1998; 83:4467-73. [PMID: 9851795 DOI: 10.1210/jcem.83.12.5304] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In spite of the availability of abundant data about in vitro spermatogenesis in laboratory animals, studies on human in vitro spermatogenesis are scarce. This study employed a relatively simple culture system, involving all cell types of seminiferous tubules, to analyze the effects of FSH and testosterone (T) on different characteristics of human germ and Sertoli cells in culture. By using fluorescence in-situ hybridization, we show that in vitro reduction of germ cell ploidy can be stimulated by FSH but not by T. FSH, but not T, also induced unexpectedly rapid (24-48 h) morphological changes resembling spermiogenesis, although individual changes (spermatid nucleus condensation and protrusion, cell body elongation, and flagellar growth) proceeded in an uncoordinated way and mostly resulted in the development of abnormal forms of elongated spermatids. Though ineffective alone, T potentiated the effects of FSH on meiosis and spermiogenesis. These effects of T were probably caused by the prevention of Sertoli cell apoptosis, an effect that could not be mimicked by FSH. These data show that, in the presence of high concentrations of FSH and T, human spermatogenesis can proceed in vitro with an unusual speed, but the resulting gametes are morphologically abnormal. The potential practical relevance of these findings to assisted reproduction remains to be assessed.
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Lin WW, Lamb DJ, Lipshultz LI, Kim ED. Absence of cyclic adenosine 3':5' monophosphate responsive element modulator expression at the spermatocyte arrest stage. Fertil Steril 1998; 69:533-8. [PMID: 9531892 DOI: 10.1016/s0015-0282(97)00535-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To test the hypotheses that variations in the expression of adenosine 3':5' monophosphate (cAMP) responsive element modulator are found in human seminiferous epithelium in men with impaired testicular function and subsequent infertility and that variations in apoptosis frequency are associated with differential cAMP responsive element modulator expression in male infertility states. DESIGN Standard immunohistochemical staining using a rabbit polyclonal antibody against the tau isoform of the cAMP responsive element modulator protein was performed on 5-microM sections of Bouin's fixed, paraffin-embedded testicular tissue obtained from azoospermic or severely oligozoospermic men for routine clinical purposes. Histologic diagnosis was confirmed with computerized image analysis of Feulgen-stained sections. SETTING Tertiary male infertility referral center at a medical school. PATIENT(S) Forty-eight testis biopsies were performed in 38 azoospermic or severely oligozoospermic males. INTERVENTION(S) Rabbit polyclonal cAMP responsive element modulator tau antibody was applied to the paraffin-embedded testis sections. MAIN OUTCOME MEASURE(S) Testis immunoreactivity to polyclonal cAMP responsive element modulator tau antibody and apoptotic indices. RESULT(S) Although cAMP responsive element modulator immunoreactivity was present in the round spermatid stage of meiosis in testis biopsy specimens showing normal spermatogenesis, spermatid maturation arrest, and hypospermatogenesis, there was complete absence of expression in biopsy specimens from patients with Sertoli cell only and spermatocyte maturation arrest states. In addition, significantly increased apoptotic indices were observed in the spermatocyte maturation arrest state in comparison with normal spermatogenesis and Sertoli cell only pattern. CONCLUSION(S) These data suggest that cAMP responsive element modulator may be important for spermatid development and a stage-specific regulator of human spermatogenesis. Absence of cAMP responsive element modulator may be a cause of testicular failure in various types of male infertility.
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Affiliation(s)
- W W Lin
- Baylor College of Medicine, Houston, Texas, USA
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Pereira LA, Tanaka H, Nagata Y, Sawada K, Mori H, Chimelli LM, Nishimune Y. Characterization and expression of a stage specific antigen by monoclonal antibody TRA 54 in testicular germ cells. INTERNATIONAL JOURNAL OF ANDROLOGY 1998; 21:34-40. [PMID: 9639150 DOI: 10.1046/j.1365-2605.1998.00086.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
To study the mechanism of spermatogenesis, we have isolated many monoclonal antibodies (mAb) which recognize specific steps of mouse germ cell differentiation and then have evaluated the specific expression and characterization of antigenic molecules using immunohistochemistry and Western blotting. Monoclonal antibody TRA 54 recognized specific organelles in germ cell cytoplasm from spermatocytes to spermatids; that is, a large granule was stained in mid-late pachytene, diplotene and secondary spermatocytes and in round spermatids at stage I while the acrosome of spermatids at steps 2-3 to step 12 were also positive. Thereafter, the antigens disappeared from spermatids at more advanced stages of differentiation. Western blots using TRA 54 revealed broad bands with approximate molecular weights of >200, 190 and 85 kDa in the testis. The expression of these antigens during testicular germ cell development should be of interest in relation to the biogenesis of organelles such as the chromatoid body and acrosome and will be a useful stage-specific molecular marker for the study of spermatogenesis.
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Affiliation(s)
- L A Pereira
- Department of Histology and Embryology, State University of Campinas, SP, Brazil
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32
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Escalier D, Gallo JM, Schrével J. Immunochemical characterization of a human sperm fibrous sheath protein, its developmental expression pattern, and morphogenetic relationships with actin. J Histochem Cytochem 1997; 45:909-22. [PMID: 9212817 DOI: 10.1177/002215549704500701] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Among the monoclonal antibodies (MAbs) prepared against human sperm extracts, MAb 4F7 was found to be specific to the human and Macaca fascicularis sperm cytoskeletal fibrous sheath (FS). In Western blotting, MAb 4F7 stains a doublet of polypeptides of about M(r) 95 x 10(3) in extracts of human sperm cells. These polypeptides are not recognized by the KL1 anti-cytokeratin MAb, nor by the MAbs known to bind to the carboxy terminal (IFA) and to the amino terminal (ME101) rod domain of intermediate filaments. Sequential extraction procedures shows that the FS polypeptides recognized by MAb 4F7 are exposed after treatment with 8 M urea 4F7 immunoreactivity is lost after treatment with high ionic solutions (NaCl; KCl, Kl). Immunogold electron microscopy reveals that this protein is present throughout the FS. This FS antigenic determinant first accumulates in an FS proximal body in late spermatids, then in granules extending distally along the flagellum. Staining of spermatozoa with flagellar dysgenesis reveals that this FS protein colocalizes with actin no matter what the location of their abnormal assembly. These data suggest that the transient microtubule-like spindle-shaped body of as yet unknown function could be involved in FS protein deposition and that the assembly of the FS and actin could be under the control of some common morphogenetical factor(s). MAb 4F7 should allow further investigations of this peri-axonemal structure in both normal and pathological conditions.
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Affiliation(s)
- D Escalier
- Laboratoire de Biologie de la Reproduction et du Développement, CHU Bicêtre, Le Kremlin Bicêtre, France
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Mendoza C, Benkhalifa M, Cohen-Bacrie P, Hazout A, Ménézo Y, Tesarik J. Combined use of proacrosin immunocytochemistry and autosomal DNA in situ hybridisation for evaluation of human ejaculated germ cells. ZYGOTE 1996; 4:279-83. [PMID: 9153766 DOI: 10.1017/s0967199400003233] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The recently reported human pregnancies and births after fertilising oocytes with round spermatids recovered from the ejaculate of men with non-obstructive azoospermia have underscored the need for a more accurate evaluation of the nuclear and cytoplasmic maturation status of ejaculated germ cells. In this study we describe our first experience with a method combining the immunocytochemical visualisation of proacrosin with autosomal DNA fluorescence in situ hybridisation (FISH) to assess ejaculated germ cells from patients with a spermiogenesis defect. The proacrosin immunoreactivity, analysed with the use of the monoclonal antibody 4D4, has been detected in cells of round spermatid size presenting a haploid FISH figure as well as in larger cells whose ploidy corresponds to primary and secondary spermatocytes. These observations are in agreement with previously published results obtained, with the use of the same antibody, by immunocytochemical analysis of histological sections of testicular tissue. All the cells of round spermatid size possessing proacrosin immunoreactivity were found to be haploid by FISH. On the other hand, some of the haploid cells of round spermatid size did not possess proacrosin immunoreactivity. The structural pattern of proacrosin immunoreactivity was highly variable both in spermatids and in younger spermatogenic cells. These data show that cell size is the main criterion to be used for the identification of ejaculated round spermatids, whereas the presence of the developing acrosome represents only an auxiliary criterion. The scoring of acrosomal development in ejaculated spermatids may be useful as part of pre-treatment diagnosis before the inclusion of infertile couples in a spermatid conception programme.
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Affiliation(s)
- C Mendoza
- Department of Biochemistry and Molecular Biology, University of Granada Faculty of Sciences, Spain
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Blendy JA, Kaestner KH, Weinbauer GF, Nieschlag E, Schütz G. Severe impairment of spermatogenesis in mice lacking the CREM gene. Nature 1996; 380:162-5. [PMID: 8600391 DOI: 10.1038/380162a0] [Citation(s) in RCA: 383] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Spermatogenesis is a complex developmental process that occurs in several phases. A large number of genes have been identified that are expressed during spermatogenesis, but the biological significance of many of these is not yet known. We have used gene targeting to selectively eliminate the transcription factor CREM (cyclic AMP- responsive element modulator), which is thought to be important for mammalian spermatogenesis. Male mice deficient for all CREM proteins are sterile, as their developing spermatids fail to differentiate into sperm, and postmeiotic gene expression in the testis declines dramatically. The cessation of sperm development is not accompanied by decreases in the levels of follicle-stimulating hormone or testosterone. Our findings indicate that the CREM gene is essential for spermatogenesis, and mice deficient for this transcription factor could serve as a model system for the study of idiopathic infertility in men.
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Affiliation(s)
- J A Blendy
- Molecular Biology of the Cell I Division, German Cancer Research Center, Heidelberg, Germany
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Way M, Sanders M, Chafel M, Tu YH, Knight A, Matsudaira P. beta-Scruin, a homologue of the actin crosslinking protein scruin, is localized to the acrosomal vesicle of Limulus sperm. J Cell Sci 1995; 108 ( Pt 10):3155-62. [PMID: 7593276 DOI: 10.1242/jcs.108.10.3155] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Scruin (alpha-scruin) is an actin bundling protein found in the acrosomal process of Limulus polyhemus sperm. We have cloned and sequenced a second scruin isoform from Limulus, beta-scruin, that is 67% identical to alpha-scruin. Northern and Southern analyses confirm that beta-scruin and alpha-scruin are encoded by distinct genes. The sequence of beta-scruin, like alpha-scruin, is organized into N- and C-terminal superbarrel domains that are characterized by a six-fold repeat of a 50 residue motif. Western analysis using rabbit polyclonal antisera specific for alpha- and beta-scruin indicate that beta-scruin, like alpha-scruin, is found in Limulus sperm but not blood or muscle. Both immunofluorescence microscopy and immunogold-EM localize beta-scruin within the acrosomal vesicle at the anterior of sperm but not in the acrosomal process. The function of beta-scruin in this membrane-bounded compartment that is devoid of actin is unknown. However, the location of beta-scruin together with the fact that it contains two putative beta-superbarrel structural folds, which are known to be catalytic domains in a number of proteins, suggests it may have a possible enzymatic role.
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Affiliation(s)
- M Way
- Whitehead Institute, Nine Cambridge Center, MA 02142, USA
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36
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An acrosomal protein, sp32, in mammalian sperm is a binding protein specific for two proacrosins and an acrosin intermediate. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37000-x] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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37
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Valdivia M, Yunes R, Melendez J, de Ioannes AE, Leyton L, Becker MI, Barros C. Immunolocalization of proacrosin/acrosin in rabbit sperm during acrosome reaction and in spermatozoa recovered from the perivitelline space. Mol Reprod Dev 1994; 37:216-22. [PMID: 8179905 DOI: 10.1002/mrd.1080370213] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The participation of acrosin in mammalian sperm penetration through the zona pellucida has been amply debated. In this paper we report the immunolocalization--by silver enhanced immunogold technique using ACRO-8C10 monoclonal antibody to human acrosin--of proacrosin/acrosin on ejaculated rabbit spermatozoa incubated in vitro in a capacitating medium and on spermatozoa recovered from the perivitelline space. After incubation in a capacitating medium, four different patterns were observed: (1) no labeling on acrosome intact spermatozoa; (2) labeling on the rim of the head; (3) labeling on the whole acrosome area; and (4) no labeling on acrosome reacted spermatozoa. At the start of incubation, spermatozoa with pattern 1 were the most abundant, whereas at the end of the 32 h incubation period, patterns 2 and 3 were the most frequent. On the other hand, 625 perivitelline spermatozoa were recovered from 17 fertilized rabbit eggs, of which 26% were labeled with the antiacrosin monoclonal antibody ACRO-8C10 in two different areas: (1) only on the equatorial region; and (2) only on the postacrosomal area. These results are consistent with the idea that proacrosin/acrosin remains associated to the acrosome reacted spermatozoa for long periods of time, and that proacrosin/acrosin associated to perivitelline spermatozoa could be responsible for the second penetration of fresh rabbit eggs by perivitelline spermatozoa.
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Affiliation(s)
- M Valdivia
- Embryology Laboratory, Faculty of Biological Sciences, P. Catholic University of Chile, Santiago
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Escalier D, Bermùdez D, Gallo JM, Viellefond A, Schrével J. Cytoplasmic events in human meiotic arrest as revealed by immunolabelling of spermatocyte proacrosin. Differentiation 1992; 51:233-43. [PMID: 1459363 DOI: 10.1111/j.1432-0436.1992.tb00701.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Proacrosin appears in the Golgi complex as early as the mid-pachytene stage and immediately thereafter initiates partition to be equally distributed in spermatids. The anti-proacrosin monoclonal antibody 4D4 (mAb 4D4) was used as a marker of these cytoplasmic events in ten men exhibiting spermatogenesis arrest in three specific stages: (i) leptotene/zygotene spermatocyte I with impaired chromosome pairing (six cases), (ii) early pachytene I (one case) and (iii) metaphase/anaphase I (three cases). Prophase arrest stages were identified on testis sections stained by silver nitrate. MAb 4D4 labelling revealed two types of leptotene/zygotene arrest depending on whether proacrosin was expressed or not. The data obtained enabled us to distinguish between: (i) nuclear blockages due to chromosome and/or nuclear matrix anomalies, when cytoplasmic events were either inhibited or not inhibited, and (ii) nuclear anomalies due to microtubular disturbances. In this latter case, cytokinesis was impaired as early as the prophase I, thus indicating a relationship between the Golgi partitioning and the microtubule network. Data show that meiotic arrest investigations, by means of an appropriate marker of the cytoplasmic events, provide valuable information on spermatogenic developmental processes.
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Affiliation(s)
- D Escalier
- Laboratoire de Biologie de la Reproduction et du Développement, CHU Bicêtre, Le Kremlin Bicêtre, France
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Giroux CN. Meiosis: components and process in nuclear differentiation. DEVELOPMENTAL GENETICS 1992; 13:387-91. [PMID: 1304421 DOI: 10.1002/dvg.1020130602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- C N Giroux
- Department of Molecular Biology and Genetics, School of Medicine, Wayne State University, Detroit, Michigan
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