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Effect of Epidermal Growth Factor (EGF) on Cryopreserved Piedmontese Bull Semen Characteristics. Animals (Basel) 2022; 12:ani12223179. [PMID: 36428406 PMCID: PMC9687023 DOI: 10.3390/ani12223179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 11/18/2022] Open
Abstract
The purpose of this study was to determine the effect on fresh and post-thaw beef bull semen quality of the supplementation of epidermal growth factor (EGF) to the semen extender at various concentrations (0-control, 50, 100, 200, and 400 ng/mL). For 8 weeks, sperm was collected from four fertile bulls, yielding a total of 32 ejaculates. Semen samples were pooled, diluted with Bullxcell® extender, and then cooled, equilibrated, and frozen. After thawing, semen was tested for motility and velocity parameters. Furthermore, semen was evaluated for vitality, integrity, mitochondrial and antioxidant (SOD) activities, mucus penetration distance, and in vitro fertilizing capability. The supplementation with EGF prior to cryopreservation improved the total sperm motility at various concentrations over long incubation periods (from 1 to 4 h). Interestingly, EGF addition improved both progressive and rapid motility, particularly at 50, 200, and 400 ng/mL. In addition, EGF, primarily at 200 and 400 ng/mL, significantly increased several velocity parameters after different incubation periods. We can conclude that adding EGF to bull sperm extender before cryopreservation has a positive stimulatory effect on sperm motility without affecting vitality, integrity, or in vitro fertilizing capability.
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Tan W, Pang Y, Tubbs C, Thomas P. Induction of sperm hypermotility through membrane progestin receptor alpha (mPRα): A teleost model of rapid, multifaceted, nongenomic progestin signaling. Gen Comp Endocrinol 2019; 279:60-66. [PMID: 30529310 DOI: 10.1016/j.ygcen.2018.12.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/05/2018] [Accepted: 12/06/2018] [Indexed: 12/17/2022]
Abstract
Rapid progestin effects on sperm physiology have been described in a variety of vertebrate species. Here, we briefly review the signaling pathways mediating rapid progestin induction of sperm hypermotility and increased fertility in two teleost species, Atlantic croaker and southern flounder. Acute in vitro treatment of teleost sperm with the progestin hormone, 20β-S, causes activation of progestin membrane receptor alpha (mPRα, or Paqr7) coupled to a stimulatory olfactory G protein (Golf), resulting in increased cAMP and calcium concentrations and hypermotility upon activation in a hyperosmotic medium. Pharmacological tools were used to investigate the involvement of mPRα and several intracellular signaling pathways in the hypermotility response. Evidence was obtained using the specific mPRα agonist, Org OD 02-0, that this progestin action is mediated through mPRα and not through the nuclear PR. The results indicate that progestins induce hypermotility through activation of a membrane adenylyl cyclase (Acy)/cAMP pathway, an epidermal growth factor receptor (Egfr)/Mapkinase pathway, and a Pi3kinase/Akt/phosphodiesterase (Pde) pathway which result in increased sperm calcium concentrations within 10 s. The finding that inhibition of any one of these pathways is sufficient to prevent hypermotility along with the calcium increase suggests that activation of all of them and the associated calcium increase are required for the progestin hypermotility response. On the basis of these findings a model of progestin induction of sperm hypermotility in teleosts is proposed. As teleosts lack CatSper, the model described here is a non-CatSper mediated one and may therefore be applicable to a wide variety of nonmammalian vertebrates.
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Affiliation(s)
- Wenxian Tan
- The University of Texas at Austin Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States; Huston-Tillotson University, 900 Chicon Street, Austin, TX 78702, United States
| | - Yefei Pang
- The University of Texas at Austin Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States
| | - Christopher Tubbs
- The University of Texas at Austin Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States; San Diego Zoo Global, Institute for Conservation Research, 15600 San Pasqual Valley Road, Escondido, CA 92027, United States
| | - Peter Thomas
- The University of Texas at Austin Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States.
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3
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Jin SK, Yang WX. Factors and pathways involved in capacitation: how are they regulated? Oncotarget 2018; 8:3600-3627. [PMID: 27690295 PMCID: PMC5356907 DOI: 10.18632/oncotarget.12274] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 09/23/2016] [Indexed: 01/07/2023] Open
Abstract
In mammals, fertilization occurs via a comprehensive progression of events. Freshly ejaculated sperm have yet to acquire progressive motility or fertilization ability. They must first undergo a series of biochemical and physiological changes, collectively known as capacitation. Capacitation is a significant prerequisite to fertilization. During the process of capacitation, changes in membrane properties, intracellular ion concentration and the activities of enzymes, together with other protein modifications, induce multiple signaling events and pathways in defined media in vitro or in the female reproductive tract in vivo. These, in turn, stimulate the acrosome reaction and prepare spermatozoa for penetration of the egg zona pellucida prior to fertilization. In the present review, we conclude all mainstream factors and pathways regulate capacitation and highlight their crosstalk. We also summarize the relationship between capacitation and assisted reproductive technology or human disease. In the end, we sum up the open questions and future avenues in this field.
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Affiliation(s)
- Shi-Kai Jin
- The Sperm Laboratory, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Wan-Xi Yang
- The Sperm Laboratory, College of Life Sciences, Zhejiang University, Hangzhou, China
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4
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Tan W, Thomas P. Involvement of epidermal growth factor receptors and mitogen-activated protein kinase in progestin-induction of sperm hypermotility in Atlantic croaker through membrane progestin receptor-alpha. Mol Cell Endocrinol 2015; 414:194-201. [PMID: 26118657 DOI: 10.1016/j.mce.2015.06.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 06/08/2015] [Accepted: 06/22/2015] [Indexed: 01/24/2023]
Abstract
The intracellular pathways mediating rapid, nongenomic progestin stimulation of sperm motility remain unclear. The role of epidermal growth factor receptors (Egfr and ErbB2) and mitogen-activated protein kinase (Mapk) in membrane progestin receptor-alpha (mPRα)-mediated progestin stimulation of sperm hypermotility was examined in a teleost, Atlantic croaker. Inhibition of upstream regulators of Egfr, intracellular tyrosine kinase (Src) with PP2, and matrix metalloproteinase (MMP) with Ilomastat, abolished progestin-initiated sperm hypermotility by 17,20β,21-trihydroxy-4-pregnen-3-one (20β-S; 20 nM) and a specific mPRα agonist, Org OD 02-0 (20 nM). Pretreatment of croaker sperm with EGFR inhibitors, AG1478 (5 μM) and RG13022 (50 μM), the ErbB2 inhibitor, AG879 (5 nM), or the MEK1/2 inhibitor, U0126 (500 nM) blocked progestin stimulation of sperm motility. Levels of phosphorylated extracellular-related kinase 1 and 2 (P-Erk1/2) were increased after 20β-S treatment. These results demonstrate that progestin-mediated hypermotility via mPRα in croaker sperm involves activation of the Egfr, ErbB2 and Mapk pathways.
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Affiliation(s)
- Wenxian Tan
- The University of Texas Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States
| | - Peter Thomas
- The University of Texas Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States.
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5
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Gadella BM, Luna C. Cell biology and functional dynamics of the mammalian sperm surface. Theriogenology 2014; 81:74-84. [DOI: 10.1016/j.theriogenology.2013.09.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 09/07/2013] [Accepted: 09/08/2013] [Indexed: 12/11/2022]
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6
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Ickowicz D, Finkelstein M, Breitbart H. Mechanism of sperm capacitation and the acrosome reaction: role of protein kinases. Asian J Androl 2012; 14:816-21. [PMID: 23001443 PMCID: PMC3720105 DOI: 10.1038/aja.2012.81] [Citation(s) in RCA: 156] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 05/30/2012] [Accepted: 07/08/2012] [Indexed: 12/19/2022] Open
Abstract
Mammalian sperm must undergo a series of biochemical and physiological modifications, collectively called capacitation, in the female reproductive tract prior to the acrosome reaction (AR). The mechanisms of these modifications are not well characterized though protein kinases were shown to be involved in the regulation of intracellular Ca(2+) during both capacitation and the AR. In the present review, we summarize some of the signaling events that are involved in capacitation. During the capacitation process, phosphatidyl-inositol-3-kinase (PI3K) is phosphorylated/activated via a protein kinase A (PKA)-dependent cascade, and downregulated by protein kinase C α (PKCα). PKCα is active at the beginning of capacitation, resulting in PI3K inactivation. During capacitation, PKCα as well as PP1γ2 is degraded by a PKA-dependent mechanism, allowing the activation of PI3K. The activation of PKA during capacitation depends mainly on cyclic adenosine monophosphate (cAMP) produced by the bicarbonate-dependent soluble adenylyl cyclase. This activation of PKA leads to an increase in actin polymerization, an essential process for the development of hyperactivated motility, which is necessary for successful fertilization. Actin polymerization is mediated by PIP(2) in two ways: first, PIP(2) acts as a cofactor for phospholipase D (PLD) activation, and second, as a molecule that binds and inhibits actin-severing proteins such as gelsolin. Tyrosine phosphorylation of gelsolin during capacitation by Src family kinase (SFK) is also important for its inactivation. Prior to the AR, gelsolin is released from PIP(2) and undergoes dephosphorylation/activation, resulting in fast F-actin depolymerization, leading to the AR.
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Affiliation(s)
- Debby Ickowicz
- The Mina & Everard Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52100, Israel
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7
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Luna C, Colás C, Pérez-Pé R, Cebrián-Pérez JA, Muiño-Blanco T. A Novel Epidermal Growth Factor-Dependent Extracellular Signal-Regulated MAP Kinase Cascade Involved in Sperm Functionality in Sheep1. Biol Reprod 2012; 87:93. [DOI: 10.1095/biolreprod.112.100073] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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8
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Favaro P, Finn JD, Siner JI, Wright JF, High KA, Arruda VR. Safety of liver gene transfer following peripheral intravascular delivery of adeno-associated virus (AAV)-5 and AAV-6 in a large animal model. Hum Gene Ther 2011; 22:843-52. [PMID: 21126217 PMCID: PMC3135234 DOI: 10.1089/hum.2010.155] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Accepted: 11/29/2010] [Indexed: 02/02/2023] Open
Abstract
Intravascular delivery of adeno-associated virus (AAV) vector is commonly used for liver-directed gene therapy. In humans, the high prevalence of neutralizing antibodies to AAV-2 capsid and the wide cross-reactivity with other serotypes hamper vector transduction efficacy. Moreover, the safety of gene-based approaches depends on vector biodistribution, vector dose, and route of administration. Here we sought to characterize the safety of AAV-5 and AAV-6 for liver-mediated human factor IX (hFIX) expression in rabbits at doses of 1 × 10(12) or 1 × 10(13) viral genomes/kg. Circulating therapeutic levels of FIX were observed in both cohorts of AAV-6-hFIX, whereas for AAV-5-hFIX only the high dose was effective. Long-lasting inhibitory antibodies to hFIX were detected in three of the 10 AAV-6-injected animals but were absent in the AAV-5 group. Overall, vector shedding in the semen was transient and vector dose-dependent. However, the kinetics of clearance were remarkably faster for AAV-5 (3-5 weeks) compared with AAV-6 (10-13 weeks). AAV-6 vector sequences outside the liver were minimal at 20-30 weeks post-injection. In contrast, AAV-5 exhibited relatively high amounts of vector DNA in tissues other than the liver. Together these data are useful to further define the safety and potential for clinical translation of these AAV vectors.
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Affiliation(s)
- Patricia Favaro
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104
| | | | - Joshua I. Siner
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104
| | - J. Fraser Wright
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104
- University of Pennsylvania Department of Pathology and Laboratory Medicine, Philadelphia, PA 19104
| | - Katherine A. High
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104
- University of Pennsylvania School of Medicine, Philadelphia, PA 19104
- Howard Hughes Medical Institute, Philadelphia, PA 19104
| | - Valder R. Arruda
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104
- University of Pennsylvania School of Medicine, Philadelphia, PA 19104
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9
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Spaleková E, Makarevich AV, Lukáč N. Ram Sperm Motility Parameters under The Influence of Epidermal Growth Factor. Vet Med Int 2011; 2011:642931. [PMID: 21647340 PMCID: PMC3103862 DOI: 10.4061/2011/642931] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Accepted: 03/02/2011] [Indexed: 11/20/2022] Open
Abstract
Epidermal growth factor (EGF) is one of the important cytokines that play a role in fertility. It is known that EGF affects both male and female reproduction, but its effect on sperm parameters is not fully understood. Up to the present, the effect of EGF on ram sperm motility parameters has not been published. We analyzed motility parameters of ejaculates after 24, 48, and 72 hours from the EGF addition. EGF was added to chilled ram sperm at concentrations of 0, 100, 200, and 400 ng·ml−1. Analyses were realized using computer, assisted semen analyzer (CASA)—Hamilton Thorn motility analyzer (version 7). The effect of EGF was already visible after 30 min of incubation. Significant effect on ram sperm total motility and progressive movement was observed at higher EGF concentrations after 48 h of incubation. Our results show that EGF affects sperm motility parameters depending on concentration and time of exposure.
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Affiliation(s)
- Eliška Spaleková
- Department of Animal Physiology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture Nitra, Trieda A. Hlinku 2, 949 76 Nitra, Slovakia
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10
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Gu B, Zhang J, Wu Y, Zhang X, Tan Z, Lin Y, Huang X, Chen L, Yao K, Zhang M. Proteomic analyses reveal common promiscuous patterns of cell surface proteins on human embryonic stem cells and sperms. PLoS One 2011; 6:e19386. [PMID: 21559292 PMCID: PMC3086920 DOI: 10.1371/journal.pone.0019386] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Accepted: 03/28/2011] [Indexed: 12/30/2022] Open
Abstract
Background It has long been proposed that early embryos and reproductive organs exhibit
similar gene expression profiles. However, whether this similarity is
propagated to the protein level remains largely unknown. We have previously
characterised the promiscuous expression pattern of cell surface proteins on
mouse embryonic stem (mES) cells. As cell surface proteins also play
critical functions in human embryonic stem (hES) cells and germ cells, it is
important to reveal whether a promiscuous pattern of cell surface proteins
also exists for these cells. Methods and Principal Findings Surface proteins of hES cells and human mature sperms (hSperms) were purified
by biotin labelling and subjected to proteomic analyses. More than 1000
transmembrane or secreted cell surface proteins were identified on the two
cell types, respectively. Proteins from both cell types covered a large
variety of functional categories including signal transduction, adhesion and
transporting. Moreover, both cell types promiscuously expressed a wide
variety of tissue specific surface proteins, and some surface proteins were
heterogeneously expressed. Conclusions/Significance Our findings indicate that the promiscuous expression of functional and
tissue specific cell surface proteins may be a common pattern in embryonic
stem cells and germ cells. The conservation of gene expression patterns
between early embryonic cells and reproductive cells is propagated to the
protein level. These results have deep implications for the cell surface
signature characterisation of pluripotent stem cells and germ cells and may
lead the way to a new area of study, i.e., the functional significance of
promiscuous gene expression in pluripotent and germ cells.
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Affiliation(s)
- Bin Gu
- The Institute of Genetics, College of Life
Sciences, Zhejiang University, Hangzhou, China
| | - Jiarong Zhang
- The Institute of Genetics, College of Life
Sciences, Zhejiang University, Hangzhou, China
| | - Ying Wu
- Zhejiang Institute of Planned Parenthood
Research and Zhejiang Human Sperm Bank, Hangzhou, China
| | - Xinzong Zhang
- Zhejiang Institute of Planned Parenthood
Research and Zhejiang Human Sperm Bank, Hangzhou, China
| | - Zhou Tan
- The Institute of Genetics, College of Life
Sciences, Zhejiang University, Hangzhou, China
| | - Yuanji Lin
- The Institute of Genetics, College of Life
Sciences, Zhejiang University, Hangzhou, China
| | - Xiao Huang
- The Institute of Cell and Developmental
Biology, College of Life Sciences, Zhejiang University, Hangzhou,
China
| | - Liangbiao Chen
- The Institute of Genetics and Developmental
Biology, Chinese Academy of Sciences, Beijing, China
| | - Kangshou Yao
- Zhejiang Institute of Planned Parenthood
Research and Zhejiang Human Sperm Bank, Hangzhou, China
- * E-mail: (MZ); (KY)
| | - Ming Zhang
- The Institute of Genetics, College of Life
Sciences, Zhejiang University, Hangzhou, China
- * E-mail: (MZ); (KY)
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11
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Alkafafy M, Elnasharty M, Sayed-Ahmed A, Abdrabou M. Immunohistochemical studies of the epididymal duct in Egyptian water buffalo (Bubalus bubalis). Acta Histochem 2011; 113:96-102. [PMID: 19836061 DOI: 10.1016/j.acthis.2009.08.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 08/16/2009] [Accepted: 08/17/2009] [Indexed: 10/20/2022]
Abstract
Using immunohistochemistry (IHC), this study aimed to evaluate the regional distribution pattern of some biologically active proteins in the epididymis of Egyptian water buffalo and to determine the structural-functional relationships of the different epididymal structures. Wax-embedded sections from different regions of the epididymal duct from adult, clinically healthy, buffalo bulls were used. Primary antibodies against angiotensin converting enzyme (ACE), S-100, galactosyltransferase (GalTase), alpha smooth muscle actin (α-SMA), connexin 43 (Cx43) and vascular endothelial growth factor (VEGF) were used for immunohistochemical studies. The results showed that, in addition to the well-known principal and basal cells, the epididymal epithelium, similar to that of other species, possessed apical cells and intraepithelial leukocytes. IHC showed that, with the exception of VEGF which reacted negatively, all antibodies used displayed variable reactivity in the different epididymal structures. Apical cells expressed a strong reaction with ACE along the entire length of the duct. The principal cells in the caput epididymis exhibited a distinct reactivity with S-100 and GalTase. The peritubular muscular coat displayed a marked immunostaining for α-SMA and for Cx43. In conclusion these findings showed a regional-specific distribution pattern, distinct from that in bovine bulls. Some potential functional capacities, especially absorptive and secretory ones, are discussed in relation to the different epididymal regions.
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12
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Breitbart H, Etkovitz N. Role and regulation of EGFR in actin remodeling in sperm capacitation and the acrosome reaction. Asian J Androl 2010; 13:106-10. [PMID: 21200378 DOI: 10.1038/aja.2010.78] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
To bind and fertilize the egg, the spermatozoon should undergo few biochemical and motility changes in the female reproductive tract collectively called capacitation. The capacitated spermatozoon binds to the egg zona pellucida, and then undergoes the acrosome reaction (AR), which allows its penetration into the egg. The mechanisms regulating sperm capacitation and the AR are not completely understood. In the present review, we summarize some data regarding the role and regulation of the epidermal growth factor receptor (EGFR) in these processes. In the capacitation process, the EGFR is partially activated by protein kinase A (PKA), resulting in phospholipase D (PLD) activation and actin polymerization. Protein kinase C alpha (PKCα), which is already activated at the beginning of the capacitation, also participates in PLD activation. Further activation of the EGFR at the end of the capacitation enhances intracellular Ca(2+) concentration leading to F-actin breakdown and allows the AR to take place. Under in vivo conditions, the EGFR can be directly activated by its known ligand epidermal growth factor (EGF), and indirectly by activating PKA or by transactivation mediated by G protein-coupled receptors (GPCRs) activation or by ouabain. Under physiological conditions, sperm PKA is activated mainly by bicarbonate, which activates the soluble adenylyl cyclase to produce cyclic adenosine monophosphate (cAMP), the activator of PKA. The GPCR activators angiotensin II or lysophosphatidic acid, as well as ouabain and EGF are physiological components present in the female reproductive tract.
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Affiliation(s)
- Haim Breitbart
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.
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13
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Daniel L, Etkovitz N, Weiss SR, Rubinstein S, Ickowicz D, Breitbart H. Regulation of the sperm EGF receptor by ouabain leads to initiation of the acrosome reaction. Dev Biol 2010; 344:650-7. [DOI: 10.1016/j.ydbio.2010.05.490] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 03/25/2010] [Accepted: 05/15/2010] [Indexed: 11/25/2022]
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14
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Tang QY, Zhang Z, Xia J, Ren D, Logothetis DE. Phosphatidylinositol 4,5-bisphosphate activates Slo3 currents and its hydrolysis underlies the epidermal growth factor-induced current inhibition. J Biol Chem 2010; 285:19259-66. [PMID: 20392696 PMCID: PMC2885204 DOI: 10.1074/jbc.m109.100156] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 03/20/2010] [Indexed: 11/06/2022] Open
Abstract
The Slo3 gene encodes a high conductance potassium channel, which is activated by both voltage and intracellular alkalinization. Slo3 is specifically expressed in mammalian sperm cells, where it gives rise to pH-dependent outwardly rectifying K(+) currents. Sperm Slo3 is the main current responsible for the capacitation-induced hyperpolarization, which is required for the ensuing acrosome reaction, an exocytotic process essential for fertilization. Here we show that in intact spermatozoa and in a heterologous expression system, the activation of Slo3 currents is regulated by phosphatidylinositol 4,5-bisphosphate (PIP(2)). Depletion of endogenous PIP(2) in inside-out macropatches from Xenopus oocytes inhibited heterologously expressed Slo3 currents. Whole-cell recordings of sperm Slo3 currents or of Slo3 channels co-expressed in Xenopus oocytes with epidermal growth factor receptor, demonstrated that stimulation by epidermal growth factor (EGF) could inhibit channel activity in a PIP(2)-dependent manner. High concentrations of PIP(2) in the patch pipette not only resulted in a strong increase in sperm Slo3 current density but also prevented the EGF-induced inhibition of this current. Mutation of positively charged residues involved in channel-PIP(2) interactions enhanced the EGF-induced inhibition of Slo3 currents. Overall, our results suggest that PIP(2) is an important regulator for Slo3 activation and that receptor-mediated hydrolysis of PIP(2) leads to inhibition of Slo3 currents both in native and heterologous expression systems.
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Affiliation(s)
- Qiong-Yao Tang
- From the Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, Virginia 23298-0551 and
| | - Zhe Zhang
- From the Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, Virginia 23298-0551 and
| | - Jingsheng Xia
- the Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Dejian Ren
- the Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Diomedes E. Logothetis
- From the Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, Virginia 23298-0551 and
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15
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JIN W, TANAKA A, WATANABE G, MATSUDA H, TAYA K. Effect of NGF on the Motility and Acrosome Reaction of Golden Hamster Spermatozoa In Vitro. J Reprod Dev 2010; 56:437-43. [DOI: 10.1262/jrd.09-219n] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- WanZhu JIN
- Laboratory of Veterinary Physiology, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
- Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University
- Department of Cellular Molecular Physiology, Joslin Diabetes Center & Harvard Medical School
| | - Akane TANAKA
- Laboratory of Veterinary Molecular Pathology and Therapeutics, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
| | - Gen WATANABE
- Laboratory of Veterinary Physiology, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
- Division of Animal Life Science, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
- Laboratory of Veterinary Molecular Pathology and Therapeutics, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
| | - Hiroshi MATSUDA
- Laboratory of Veterinary Molecular Pathology and Therapeutics, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
| | - Kazuyoshi TAYA
- Laboratory of Veterinary Physiology, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
- Division of Animal Life Science, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
- Laboratory of Veterinary Molecular Pathology and Therapeutics, Graduate School, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
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16
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Etkovitz N, Tirosh Y, Chazan R, Jaldety Y, Daniel L, Rubinstein S, Breitbart H. Bovine sperm acrosome reaction induced by G-protein-coupled receptor agonists is mediated by epidermal growth factor receptor transactivation. Dev Biol 2009; 334:447-57. [PMID: 19666015 DOI: 10.1016/j.ydbio.2009.08.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Revised: 07/22/2009] [Accepted: 08/03/2009] [Indexed: 10/20/2022]
Abstract
We have previously demonstrated the presence of active epidermal growth factor receptor (EGFR) and its involvement in sperm capacitation and the acrosome reaction; however, the mechanism of EGFR activation was not clear. We show here that the sperm EGFR can be transactivated by angiotensin II or by lysophosphatydic acid, two ligands which activate specific G-protein-coupled receptors (GPCR), or by directly activating protein kinase A using 8Br-cAMP. This transactivation occurs in noncapacitated sperm and is mediated by PKA, SRC and a metalloproteinase. We also show that the EGFR is activated in sperm incubated under in vitro capacitation conditions, without any added ligand, but not in bicarbonate-deficient medium or when PKA is blocked. Despite the fact that EGFR is activated in capacitated sperm, this state is not sufficient to induce the acrosome reaction. We conclude that the EGFR is stimulated during capacitation via PKA activation, while further activation of the EGFR in capacitated sperm is required in order to induce the acrosome reaction. The acrosome reaction can be induced by GPCR via the transactivation of the EGFR by a signaling pathway involving PKA, SRC and metalloproteinase and the EGFR down-stream effectors PI3K, PLC and PKC.
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Affiliation(s)
- Nir Etkovitz
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
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