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Articoli di riviste sul tema "Spermatozoa Physiology"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 gennaio 2023

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1

Aitken, RJ. "Free radicals, lipid peroxidation and sperm function." Reproduction, Fertility and Development 7, no. 4 (1995): 659. http://dx.doi.org/10.1071/rd9950659.

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The cellular generation of reactive oxygen species was first observed in mammalian spermatozoa in the late 1940s. The field then remained dormant for 30 years until Thaddeus Mann and Roy Jones published a series of landmark papers in the 1970s in which the importance of lipid peroxidation as a mechanism for damaging mammalian spermatozoa was first intimated. The subsequent demonstration that human spermatozoa produce reactive oxygen species and are susceptible to peroxidative damage has triggered intense interest in the role of oxidative stress in the aetiology of male infertility. Moreover, d

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2

Ishijima, S., M. S. Hamaguchi, M. Naruse, S. A. Ishijima, and Y. Hamaguchi. "Rotational movement of a spermatozoon around its long axis." Journal of Experimental Biology 163, no. 1 (February 1, 1992): 15–31. http://dx.doi.org/10.1242/jeb.163.1.15.

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The rotational movement of a spermatozoon around its longitudinal axis was investigated by two methods: by observing a spermatozoon attached vertically to a coverslip by the tip of its head, and by observing a spermatozoon freely swimming in a medium by means of ‘double-focal microscopy’, which yielded simultaneous images at two different focal planes. Similar results were obtained by these two methods. Sea urchin, starfish, medaka, human, golden hamster and bull spermatozoa rolled in both clockwise and counterclockwise directions, although there was a large difference in the proportion of spe

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3

Rajalakshmi, M. "Physiology of the epididymis and spermatozoa." Journal of Biosciences 7, no. 2 (March 1985): 191–95. http://dx.doi.org/10.1007/bf02703587.

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4

Seubparu, Lucksanaveejit, Mingkwan Nipitwathanaphon, Wijit Wisoram, David Merritt, and Lertluk Ngernsiri. "Morphology of testes, spermatogenesis, sperm bundles, and spermatozoa ofKerria chinensis(Hemiptera: Kerriidae)." Canadian Entomologist 150, no. 5 (September 19, 2018): 594–609. http://dx.doi.org/10.4039/tce.2018.39.

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AbstractThe filamentous spermatozoa of scale insects (Hemiptera) are highly modified compared with those of typical insects. Here, we investigate the morphology of the testes, sperm bundles, spermatozoa, and spermatogenesis of the winglessKerria chinensis(Mahdihassan) (Hemiptera: Kerriidae), a shellac-producing scale insect. Each testis contains two antiparallel groups of several hundred syncytial sperm bundles. In each spermatocyte cyst, 16 primary spermatocytes divide via inverted meiosis, resulting in 16 quadrinucleated spermatids, each having two euchromatic and two heterochromatic nuclei.

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5

Wayman, C., S. Phillips, C. Lunny, T. Webb, L. Fawcett, R. Baxendale, and G. Burgess. "Phosphodiesterase 11 (PDE11) regulation of spermatozoa physiology." International Journal of Impotence Research 17, no. 3 (March 31, 2005): 216–23. http://dx.doi.org/10.1038/sj.ijir.3901307.

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6

Seftel, Allen D. "Phosphodiesterase 11 (PDE11) Regulation of Spermatozoa Physiology." Journal of Urology 174, no. 3 (September 2005): 1043–44. http://dx.doi.org/10.1016/s0022-5347(01)68504-5.

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7

Chaykin, S. "Non-fertilizing spermatozoa: Initiators of gestational physiology." Medical Hypotheses 23, no. 2 (June 1987): 153–55. http://dx.doi.org/10.1016/0306-9877(87)90151-4.

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8

Wang, Xiaona, Hua Qian, Xiaoyuan Huang, Jinjing Li, Jiayan Zhang, Nan Zhu, Hua Chen, et al. "UCP2 Mitigates the Loss of Human Spermatozoa Motility by Promoting mROS Elimination." Cellular Physiology and Biochemistry 50, no. 3 (2018): 952–62. http://dx.doi.org/10.1159/000494479.

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Background/Aims: To demonstrate the function of uncoupling protein 2 (UCP2) in the regulation of human spermatozoa motility. Methods: Semen samples were collected from donors with either normal spermatozoa motility (normospermia [NS]) or poor spermatozoa motility (asthenospermia [AS]). UCP2 protein in spermatozoawas quantified by Western blotting. The level of mitochondrial reactive oxygen species (mROS) was evaluated by MitoSOX Red. The activity of mitochondrial membrane potential (MMP) in spermatozoa was evaluated by a JC-1 assay and the ATP level was monitored by a luciferin-luciferase assa

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9

O’Flaherty, Cristian. "Peroxiredoxin 6: The Protector of Male Fertility." Antioxidants 7, no. 12 (November 24, 2018): 173. http://dx.doi.org/10.3390/antiox7120173.

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The spermatozoon is a terminal cell with the unique purpose of delivering the paternal genome to the oocyte during fertilization. Once spermatozoa enter into the female reproductive tract, they count on only the antioxidant protection that they received during spermatogenesis and epididymal maturation. Peroxiredoxins (PRDXs), particularly PRDX6, are important players in the antioxidant protection and regulation of reactive oxygen species (ROS) levels in spermatozoa. PRDX6, through its peroxidase and calcium-independent phospholipase A2 activities, plays a major role in the regulation of ROS to

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10

Fernández-Alegre, Estela, Indira Álvarez-Fernández, Juan Carlos Domínguez, Adriana Casao, and Felipe Martínez-Pastor. "Melatonin Non-Linearly Modulates Bull Spermatozoa Motility and Physiology in Capacitating and Non-Capacitating Conditions." International Journal of Molecular Sciences 21, no. 8 (April 13, 2020): 2701. http://dx.doi.org/10.3390/ijms21082701.

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Bull spermatozoa physiology may be modulated by melatonin. We washed ejaculated spermatozoa free of melatonin and incubated them (4 h, 38 °C) with 0-pM, 1-pM, 100-pM, 10-nM and 1-µM melatonin in TALP-HEPES (non-capacitating) and TALP-HEPES-heparin (capacitating). This range of concentrations encompassed the effects mediated by melatonin receptors (pM), intracellular targets (nM–µM) or antioxidant activity (µM). Treatment effects were assessed as motility changes by computer-assisted sperm analysis (CASA) of motility and physiological changes by flow cytometry. Melatonin effects were more evide

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11

GRIVEAU, J. F., and D. LE LANNOU. "Reactive oxygen species and human spermatozoa: physiology and pathology." International Journal of Andrology 20, no. 2 (July 1997): 61–69. http://dx.doi.org/10.1046/j.1365-2605.1997.00044.x.

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12

Olabarrieta, Estibaliz, Lide Totorikaguena, Jon Romero-Aguirregomezcorta, Naiara Agirregoitia, and Ekaitz Agirregoitia. "Mu opioid receptor expression and localisation in murine spermatozoa and its role in IVF." Reproduction, Fertility and Development 32, no. 4 (2020): 349. http://dx.doi.org/10.1071/rd19176.

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The endogenous opioid peptides are reported to be involved in the regulation of reproductive physiology. Many of the studies conclude with statements on the harmful effect of opioids on male fertility but, in fact, there are no studies regarding the real fertilisation potential of spermatozoa that have been exposed to opioids. The aim of the present study was to examine if modulation of mu opioid receptor (OPRM1) in murine spermatozoa during capacitation influenced embryo production after IVF. The presence of OPRM1 in murine mature spermatozoa was analysed by reverse transcription–polymerase c

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13

Dangott, Lawrence J., and David L. Garbers. "Eggs Affect the Activity of Spermatozoa." Physiology 1, no. 4 (August 1, 1986): 128–30. http://dx.doi.org/10.1152/physiologyonline.1986.1.4.128.

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It has been known for several decades that animal spermatozoa respond to substances associated with or produced by eggs and/or the female reproductive tract. Sperm motility and metabolism are affected, and, in addition, chemotaxis has been reported in various invertebrates and lower vertebrates. The mechanisms of communication begin to be understood, receptors on the sperm cell have been identified, and early biochemical events following receptor activation have been defined.

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14

Tushnova, M. P. "Spermotoxins and their role in the physiology and pathology of the body." Kazan medical journal 20, no. 2 (August 11, 2021): 196–202. http://dx.doi.org/10.17816/kazmj76230.

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15

Cruz, Daniel Filipe, and Margarida Fardilha. "Relevance of peroxynitrite formation and 3-nitrotyrosine on spermatozoa physiology." Porto Biomedical Journal 1, no. 4 (September 2016): 129–35. http://dx.doi.org/10.1016/j.pbj.2016.07.004.

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16

Berby, Benoit, Cynthia Bichara, Aurélie Rives-Feraille, Fanny Jumeau, Pierre Di Pizio, Véronique Sétif, Louis Sibert, Ludovic Dumont, Chistine Rondanino, and Nathalie Rives. "Oxidative Stress Is Associated with Telomere Interaction Impairment and Chromatin Condensation Defects in Spermatozoa of Infertile Males." Antioxidants 10, no. 4 (April 12, 2021): 593. http://dx.doi.org/10.3390/antiox10040593.

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Telomere length can be influenced by reactive oxygen species (ROS) generated by lifestyle factors or environmental exposure. We sought to determine whether oxidative stress has an impact on sperm nuclear alterations, especially on chromatin organization and telomere interactions in the spermatozoa of infertile males. We performed an observational and prospective study including fifty-two males, allocated in the “case group” (30 infertile males presenting conventional semen parameter alterations) and the “control group” (22 males with normal conventional semen parameters). ROS detection was det

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17

Pinart, Elisabeth. "Ion Channels of Spermatozoa: Structure, Function, and Regulation Mechanisms." International Journal of Molecular Sciences 23, no. 11 (May 24, 2022): 5880. http://dx.doi.org/10.3390/ijms23115880.

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Ion transport is essential for sperm physiology, being involved in sperm-cell differentiation and maturation, motility activation, chemotaxis towards the oocyte, and fertilization, as well as in sperm adaptation to the surrounding medium [...]

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18

Shen, Meng-Ru, Joel Linden, Shun-Sheng Chen, and Sheng-Nan Wu. "IDENTIFICATION OF ADENOSINE RECEPTORS IN HUMAN SPERMATOZOA." Clinical and Experimental Pharmacology and Physiology 20, no. 7-8 (August 1993): 527–34. http://dx.doi.org/10.1111/j.1440-1681.1993.tb01736.x.

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19

Sullivan, Robert, and Fabrice Saez. "Epididymosomes, prostasomes, and liposomes: their roles in mammalian male reproductive physiology." REPRODUCTION 146, no. 1 (July 2013): R21—R35. http://dx.doi.org/10.1530/rep-13-0058.

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Abstract (sommario):

Mammalian spermatozoa are unique cells in many ways, and the acquisition of their main function, i.e. fertilization capacity, is a multistep process starting in the male gonad and ending near the female egg for the few cells reaching this point. Owing to the unique character of this cell, the molecular pathways necessary to achieve its maturation also show some specific characteristics. One of the most striking specificities of the spermatozoon is that its DNA is highly compacted after the replacement of histones by protamines, making the classical processes of transcription and translation im

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20

Wallimann, Theo, Hanni Moser, Beat Zurbriggen, Gabi Wegmann, and Hans M. Eppenberger. "Creatine kinase isoenzymes in spermatozoa." Journal of Muscle Research and Cell Motility 7, no. 1 (February 1986): 25–34. http://dx.doi.org/10.1007/bf01756199.

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21

Zheng, X., M. Geiger, S. Ecke, E. Bielek, P. Donner, U. Eberspacher, W. D. Schleuning, and B. R. Binder. "Inhibition of acrosin by protein C inhibitor and localization of protein C inhibitor to spermatozoa." American Journal of Physiology-Cell Physiology 267, no. 2 (August 1, 1994): C466—C472. http://dx.doi.org/10.1152/ajpcell.1994.267.2.c466.

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Protein C inhibitor (PCI) is synthesized by cells throughout the male reproductive tract and is present in high concentrations (220 micrograms/ml) in seminal plasma. Seminal plasma as well as the acrosome of spermatozoa are rich in possible target proteases for PCI. We analyzed the interaction of PCI with acrosin, a serine protease stored in its zymogen form in the acrosome of spermatozoa. Purified human PCI inhibited the amidolytic activity of purified boar acrosin with an apparent second-order rate constant of 3.7 x 10(4) M-1.s-1. Inhibition was paralleled by the degradation of PCI from its

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22

KVIST, ULRIK, LARS BJÖRNDAHL, GODFRIED M. ROOMANS, and CHRISTER LINDHOLMER. "Nuclear zinc in human epididymal and ejaculated spermatozoa." Acta Physiologica Scandinavica 125, no. 2 (October 1985): 297–303. http://dx.doi.org/10.1111/j.1748-1716.1985.tb07719.x.

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23

Caballero, Julieta, Gilles Frenette, and Robert Sullivan. "Post Testicular Sperm Maturational Changes in the Bull: Important Role of the Epididymosomes and Prostasomes." Veterinary Medicine International 2011 (2011): 1–13. http://dx.doi.org/10.4061/2011/757194.

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After spermatogenesis, testicular spermatozoa are not able to fertilize an oocyte, they must undergo sequential maturational processes. Part of these essential processes occurs during the transit of the spermatozoa through the male reproductive tract. Since the sperm become silent in terms of translation and transcription at the testicular level, all the maturational changes that take place on them are dependent on the interaction of spermatozoa with epididymal and accessory gland fluids. During the last decades, reproductive biotechnologies applied to bovine species have advanced significantl

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24

Li, Yunlei, Yanyan Sun, Aixin Ni, Lei Shi, Panlin Wang, Adamu Mani Isa, Pingzhuang Ge, et al. "Seminal Plasma Proteome as an Indicator of Sperm Dysfunction and Low Sperm Motility in Chickens." Molecular & Cellular Proteomics 19, no. 6 (April 20, 2020): 1035–46. http://dx.doi.org/10.1074/mcp.ra120.002017.

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Molecular mechanisms underlying sperm motility have not been fully explained, particularly in chickens. The objective was to identify seminal plasma proteins associated with chicken sperm motility by comparing the seminal plasma proteomic profile of roosters with low sperm motility (LSM, n = 4) and high sperm motility (HSM, n = 4). Using a label-free MS-based method, a total of 522 seminal plasma proteins were identified, including 386 (∼74%) previously reported and 136 novel ones. A total of 70 differentially abundant proteins were defined, including 48 more-abundant, 15 less-abundant, and se

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Nixon, Brett, Amanda L. Anderson, Elizabeth G. Bromfield, Jacinta H. Martin, Shenae L. Cafe, David A. Skerrett-Byrne, Matthew D. Dun, Andrew L. Eamens, Geoffry N. De Iuliis, and Stephen D. Johnston. "Post-testicular sperm maturation in the saltwater crocodile Crocodylus porosus: assessing the temporal acquisition of sperm motility." Reproduction, Fertility and Development 33, no. 9 (2021): 530. http://dx.doi.org/10.1071/rd20204.

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Conservation efforts to secure the long-term survival of crocodilian species would benefit from the establishment of a frozen sperm bank in concert with artificial breeding technologies to maintain genetic diversity among captive assurance populations. Working towards this goal, our research has focused on the saltwater crocodile Crocodylus porosus as a tractable model for understanding crocodilian sperm physiology. In extending our systematic characterisation of saltwater crocodile spermatozoa, in this study we examined the development of motility during sperm transport through the excurrent

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Omori, Toshihiro, and Takuji Ishikawa. "Swimming of Spermatozoa in a Maxwell Fluid." Micromachines 10, no. 2 (January 24, 2019): 78. http://dx.doi.org/10.3390/mi10020078.

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It has been suggested that the swimming mechanism used by spermatozoa could be adopted for self-propelled micro-robots in small environments and potentially applied to biomedical engineering. Mammalian sperm cells must swim through a viscoelastic mucus layer to find the egg cell. Thus, understanding how sperm cells swim through viscoelastic liquids is significant not only for physiology, but also for the design of micro-robots. In this paper, we developed a numerical model of a sperm cell in a linear Maxwell fluid based on the boundary element slender-body theory coupling method. The viscoelas

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Peña, Fernando J., Cristian O’Flaherty, José M. Ortiz Rodríguez, Francisco E. Martín Cano, Gemma L. Gaitskell-Phillips, María C. Gil, and Cristina Ortega Ferrusola. "Redox Regulation and Oxidative Stress: The Particular Case of the Stallion Spermatozoa." Antioxidants 8, no. 11 (November 19, 2019): 567. http://dx.doi.org/10.3390/antiox8110567.

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Abstract (sommario):

Redox regulation and oxidative stress have become areas of major interest in spermatology. Alteration of redox homeostasis is recognized as a significant cause of male factor infertility and is behind the damage that spermatozoa experience after freezing and thawing or conservation in a liquid state. While for a long time, oxidative stress was just considered an overproduction of reactive oxygen species, nowadays it is considered as a consequence of redox deregulation. Many essential aspects of spermatozoa functionality are redox regulated, with reversible oxidation of thiols in cysteine resid

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Minelli, A., P. Miscetti, A. Proietti, L. Luzi, and I. Mezzasoma. "Adenosine triphosphate catabolism in bovine spermatozoa." Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology 110, no. 3 (March 1995): 605–11. http://dx.doi.org/10.1016/0305-0491(94)00180-3.

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Maxwell, W. M. C., and L. A. Johnson. "Physiology of spermatozoa at high dilution rates: the influence of seminal plasma." Theriogenology 52, no. 8 (December 1999): 1353–62. http://dx.doi.org/10.1016/s0093-691x(99)00222-8.

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Ishijima, S., and H. Mohri. "A quantitative description of flagellar movement in golden hamster spermatozoa." Journal of Experimental Biology 114, no. 1 (January 1, 1985): 463–75. http://dx.doi.org/10.1242/jeb.114.1.463.

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Abstract (sommario):

Flagellar movement of golden hamster spermatozoa obtained from the testis and the caput and cauda epididymides was observed by a light microscope while holding them at their heads with a micropipette. Flagellar movement of capacitated spermatozoa and of reactivated spermatozoa demembranated with Triton X-100 was also observed. Testicular and caput epididymal spermatozoa showed weak movement in Tyrode's solution, whereas cauda epididymal spermatozoa showed vigorous movement. The flagellar bends of the cauda epididymal spermatozoa were almost planar. Capacitated spermatozoa moved with waves of a

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31

Miller, Jr, R. R., F. Beranek, A. L. Anderson, S. D. Johnston, and B. Nixon. "Plasma and acrosomal membrane lipid content of saltwater crocodile spermatozoa." Reproduction, Fertility and Development 33, no. 9 (2021): 596. http://dx.doi.org/10.1071/rd21007.

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This study describes the chemical lipid composition of the sperm plasma and acrosomal membranes of the saltwater crocodile Crocodylus porosus with the aim of providing new insights into sperm physiology, particularly that associated with their preservation ex vivo. The specific fatty acid composition of the sperm plasma and acrosomal membranes is documented. The mean (±s.d.) ratio of unsaturated to saturated membrane fatty acids within the plasma membrane was 2.57±0.50, and was determined to be higher than a similar analysis of the lipids found in the acrosomal membrane (0.70±0.10). The saltwa

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Bintara, S. "Rasio Spermatozoa X:Y dan Kualitas Sperma pada Kambing Kacang dan Peranakan Ettawa." Sains Peternakan 9, no. 2 (February 6, 2017): 65. http://dx.doi.org/10.20961/sainspet.9.2.65-71.

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<p>The objective of the study was to know the difference of X:Y spermatozoa ratio and sperm quality of Kacang and Ettawa-crossed breed goats. It was conducted at Laboratory of Animal Physiology and Reproduction, Faculty of Animal Science Universitas Gadjah Mada for three months, starting December 2009 to February 2010. Materials of the study were sperm collected from six two-year Ettawa-crossed breed goats weighing 31.5±2.2 kg and from six two-year Kacang goats weighing 18.0±2.1 kg. The sperm was collected using artificial vagina with frequency of twice a week for each goat and it was re

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Bintara, S. "Rasio Spermatozoa X:Y dan Kualitas Sperma pada Kambing Kacang dan Peranakan Ettawa." Sains Peternakan 9, no. 2 (February 6, 2017): 65. http://dx.doi.org/10.20961/sainspet.v9i2.4792.

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<p>The objective of the study was to know the difference of X:Y spermatozoa ratio and sperm quality of Kacang and Ettawa-crossed breed goats. It was conducted at Laboratory of Animal Physiology and Reproduction, Faculty of Animal Science Universitas Gadjah Mada for three months, starting December 2009 to February 2010. Materials of the study were sperm collected from six two-year Ettawa-crossed breed goats weighing 31.5±2.2 kg and from six two-year Kacang goats weighing 18.0±2.1 kg. The sperm was collected using artificial vagina with frequency of twice a week for each goat and it was re

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Regnier, Glenn, Elke Bocksteins, Waleed F. Marei, Isabel Pintelon, Jean-Pierre Timmermans, Jo L. M. R. Leroy, and Dirk J. Snyders. "Targeted deletion of the Kv6.4 subunit causes male sterility due to disturbed spermiogenesis." Reproduction, Fertility and Development 29, no. 8 (2017): 1567. http://dx.doi.org/10.1071/rd16075.

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Electrically silent voltage-gated potassium (KvS) channel subunits (i.e. Kv5–Kv6 and Kv8–Kv9) do not form functional homotetrameric Kv channels, but co-assemble with Kv2 subunits, generating functional heterotetrameric Kv2–KvS channel complexes in which the KvS subunits modulate the Kv2 channel properties. Several KvS subunits are expressed in testis tissue but knowledge about their contribution to testis physiology is lacking. Here, we report that the targeted deletion of Kv6.4 in a transgenic mouse model (Kcng4–/–) causes male sterility as offspring from homozygous females were only obtaine

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Rotem, Ronit, Nadav Zamir, Nurit Keynan, Dalit Barkan, Haim Breitbart, and Zvi Naor. "Atrial natriuretic peptide induces acrosomal exocytosis of human spermatozoa." American Journal of Physiology-Endocrinology and Metabolism 274, no. 2 (February 1, 1998): E218—E223. http://dx.doi.org/10.1152/ajpendo.1998.274.2.e218.

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Abstract (sommario):

Acrosomal exocytosis in mammalian spermatozoa is a process essential for fertilization. We report here that atrial natriuretic peptide (ANP) markedly stimulates acrosomal exocytosis of capacitated human spermatozoa. Typically, ANP exerts some of its actions via activation of the ANP receptor (ANPR-A), a particulate guanylyl cyclase-linked receptor, and subsequent formation of guanosine 3′,5′-cyclic monophosphate (cGMP). We found that ANP-stimulated acrosome reaction was inhibited by the competitive ANPR-A antagonist anantin, indicating a receptor-mediated process. A linear fragment of ANP, ANP

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De Angelis, A., S. Managò, M. A. Ferrara, M. Napolitano, G. Coppola, and A. C. De Luca. "Combined Raman Spectroscopy and Digital Holographic Microscopy for Sperm Cell Quality Analysis." Journal of Spectroscopy 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/9876063.

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Abstract (sommario):

The diagnosis of male infertility is vastly complex. To date, morphology, motility, and concentration have been used as key parameters to establish the sperm normality and achieve pregnancy both in natural and in assisted fecundation. However, spermatozoa from infertile men could present a variety of alterations, such as DNA fragmentation, alterations of chromatin structure, and aneuploidy, which have been demonstrated to decrease reproductive capacity of men. Therefore, the ability to see detailed relationships between morphology and physiology in selected spermatozoa with submicrometric reso

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Penfold, Linda M., Steven L. Monfort, Barbara A. Wolfe, Scott B. Citino, and David E. Wildt. "Reproductive physiology and artificial insemination studies in wild and captive gerenuk (Litocranius walleri walleri)." Reproduction, Fertility and Development 17, no. 7 (2005): 707. http://dx.doi.org/10.1071/rd05077.

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Abstract (sommario):

Gerenuk antelope in North American zoos are descended from 28 founders imported from Kenya ~20 years ago. Intensive management is required to prevent inbreeding depression. Artificial insemination has potential for augmenting genetic management, but successful application requires a thorough understanding of species’ reproductive norms. Semen collected from captive (n = 10) and wild (n = 6) gerenuk contained low numbers of morphologically normal spermatozoa (~40%). Age, but not season, influenced (P < 0.05) the proportion of morphologically normal spermatozoa (mean ± s.e.m., 12–17 months of

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Matás, C., M. Sansegundo, S. Ruiz, and J. Gadea. "135 THE EFFECT OF DIFFERENT TREATMENTS OF PORCINE EJACULATED AND EPIDIDYMAL SPERMATOZOA ON ROS GENERATION." Reproduction, Fertility and Development 18, no. 2 (2006): 176. http://dx.doi.org/10.1071/rdv18n2ab135.

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The production of pig embryos in vitro is still relatively inefficient compared with results obtained with oocytes matured and fertilized in vivo. The main reasons for this limited performance are polyspermy after IVF and the poor developmental ability of embryos produced by IVM-IVF (Kikuchi et al. 2002 Biol. Reprod. 1033-1041). Between factors affecting polyspermy are the sperm procedures before IVF. Usually, these procedures including centrifugations that increase reactive oxygen species (ROS) formation in spermatozoa. ROS play an important role in sperm physiology including capacitation. Ph

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Ruiz-Díaz, Sara, Sergio Grande-Pérez, Sol Arce-López, Carolina Tamargo, Carlos Olegario Hidalgo, and Serafín Pérez-Cerezales. "Changes in the Cellular Distribution of Tyrosine Phosphorylation and Its Relationship with the Acrosomal Exocytosis and Plasma Membrane Integrity during In Vitro Capacitation of Frozen/Thawed Bull Spermatozoa." International Journal of Molecular Sciences 21, no. 8 (April 15, 2020): 2725. http://dx.doi.org/10.3390/ijms21082725.

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During sperm capacitation, intracellular signaling leads to protein tyrosine phosphorylation (PTP) of multiple cellular structures. However, the connection of this molecular signaling to the physiology of capacitated spermatozoa is not completely understood. This is the case of the short lifespan of capacitated spermatozoa and their increased susceptibility to initiate acrosomal exocytosis (AE) during incubation. Herein, by employing frozen/thawed bull spermatozoa, we aimed to study the relationship between PTP with AE and with plasma membrane integrity (PMI) at the cellular level. For this, w

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Kim, Jong, and Sampath Parthasarathy. "Oxidation and the Spermatozoa." Seminars in Reproductive Medicine 16, no. 04 (December 1998): 235–339. http://dx.doi.org/10.1055/s-2007-1016283.

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Ogbuewu, I. P., U. E. Ogundu, M. N. Opara, I. C. Okoli, D. O. Umesiobi, U. Herbert, and M. U. Iloeje. "Spermatozoa Manipulation Techniques: A Current Assisted Reproductive Technology Tool Kit in Reproductive Physiology." Journal of Medical Sciences 10, no. 5 (August 15, 2010): 110–23. http://dx.doi.org/10.3923/jms.2010.110.123.

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Luconi, Michaela, Lorella Bonaccorsi, Gianni Forti, and Elisabetta Baldi. "Signal transduction mechanisms in human spermatozoa: from physiology to possible new therapeutic applications." Emerging Therapeutic Targets 4, no. 2 (April 2000): 239–53. http://dx.doi.org/10.1517/14728222.4.2.239.

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Chłopik, Angelika, and Anna Wysokińska. "Canine spermatozoa—What do we know about their morphology and physiology? An overview." Reproduction in Domestic Animals 55, no. 2 (December 14, 2019): 113–26. http://dx.doi.org/10.1111/rda.13596.

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Wang, Hua-Feng, Meng Chang, Ting-Ting Peng, Yi Yang, Na Li, Tao Luo, Yi-Min Cheng, Meng-Zhi Zhou, Xu-Hui Zeng, and Li-Ping Zheng. "Exposure to Cadmium Impairs Sperm Functions by Reducing CatSper in Mice." Cellular Physiology and Biochemistry 42, no. 1 (2017): 44–54. http://dx.doi.org/10.1159/000477113.

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Abstract (sommario):

Background: Cadmium (Cd), a common environmental heavy metal and endocrine disruptor, is known to exert toxic effects on the testes. However, the mechanisms accounting for its toxicity in mature spermatozoa remain unclear. Methods: Adult male C57BL/6 mice were orally administered with CdCl2 for 5 weeks at 3 mg·kg-1·day-1. Additionally, mouse spermatozoa were incubated in vitro with different doses of CdCl2 (0, 10, 50, 250 µM). Several sperm functions including the sperm motility, viability and acrosome reaction (AR) ratio were then examined. Furthermore, the current and expression levels of bo

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Bumanlag, Edrian, Eleonora Scarlata, and Cristian O’Flaherty. "Peroxiredoxin 6 Peroxidase and Ca2+-Independent Phospholipase A2 Activities Are Essential to Support Male-Mouse Fertility." Antioxidants 11, no. 2 (January 25, 2022): 226. http://dx.doi.org/10.3390/antiox11020226.

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Abstract (sommario):

Human infertility is an important health problem that affects one in six couples worldwide. Half of these cases are due to male infertility. Oxidative stress is a common culprit of male infertility, promoting lipid peroxidation and the oxidation of proteins and DNA in spermatozoa, thereby impairing motility, capacitation and fertilization. Peroxiredoxin 6 (PRDX6) possesses peroxidase and Ca2+-independent-phospholipase-A2 (iPLA2) activities that scavenge ROS and repair oxidized sperm membranes, respectively. PRDX6 protects spermatozoa against oxidative stress. Infertile men’s spermatozoa have i

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Wong, PY. "Abnormal fluid transport by the epididymis as a cause of obstructive azoospermia." Reproduction, Fertility and Development 2, no. 2 (1990): 115. http://dx.doi.org/10.1071/rd9900115.

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Abstract (sommario):

It has been known for more than a decade that in many mammalian species including man, spermatozoa once shed from the testis are immature, immotile and incapable of fertilizing the ovum. During their transit through the epididymis, they undergo various morphological and functional changes that confer on them the ability to ascend the female tract, to undergo an acrosome reaction, to penetrate the zona pellucida and to effect a successful fertilization. By the time spermatozoa have reached the cauda epididymidis, they are held in a quiescent state by factors in the epididymal fluid. The epididy

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Zamir, N., D. Barkan, N. Keynan, Z. Naor, and H. Breitbart. "Atrial natriuretic peptide induces acrosomal exocytosis in bovine spermatozoa." American Journal of Physiology-Endocrinology and Metabolism 269, no. 2 (August 1, 1995): E216—E221. http://dx.doi.org/10.1152/ajpendo.1995.269.2.e216.

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Abstract (sommario):

The induction of acrosomal exocytosis in capacitated bull spermatozoa by atrial natriuretic peptide (ANP) was studied in vitro. ANP markedly stimulated acrosomal exocytosis in a calcium-dependent manner. Typically, ANP exerts its action via activation of the ANP receptor (ANPR-A), a particulate guanylyl cyclase-linked receptor, and subsequent formation of guanosine 3',5'-cyclic monophosphate (cGMP). We found that the ANP-induced acrosome reaction was inhibited by the competitive ANPR-A receptor antagonist-anantin, indicating a receptor-mediated effect. We could mimic the effect of ANP on the a

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Aitken, Robert J., and Joel R. Drevet. "The Importance of Oxidative Stress in Determining the Functionality of Mammalian Spermatozoa: A Two-Edged Sword." Antioxidants 9, no. 2 (January 27, 2020): 111. http://dx.doi.org/10.3390/antiox9020111.

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Abstract (sommario):

This article addresses the importance of oxidative processes in both the generation of functional gametes and the aetiology of defective sperm function. Functionally, sperm capacitation is recognized as a redox-regulated process, wherein a low level of reactive oxygen species (ROS) generation is intimately involved in driving such events as the stimulation of tyrosine phosphorylation, the facilitation of cholesterol efflux and the promotion of cAMP generation. However, the continuous generation of ROS ultimately creates problems for spermatozoa because their unique physical architecture and un

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Morisawa, S., and M. Morisawa. "Acquisition of potential for sperm motility in rainbow trout and chum salmon." Journal of Experimental Biology 126, no. 1 (November 1, 1986): 89–96. http://dx.doi.org/10.1242/jeb.126.1.89.

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Abstract (sommario):

The male reproductive organ of rainbow trout and chum salmon consists of a pair of testes and sperm ducts. Spermatozoa in the distal portion of the sperm ducts exhibit full motility in the K+-free medium. However, spermatozoa from the testis were almost immotile in this medium. This suggests that the spermatozoa acquire a capacity for movement during their passage from the testis along the sperm duct. In chum salmon migrating into a bay, the sperm duct was almost empty. However, after the fish have travelled upstream for 1 km to their spawning ground in the river, the spermatozoa have left the

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Morisawa, S., and M. Morisawa. "Induction of potential for sperm motility by bicarbonate and pH in rainbow trout and chum salmon." Journal of Experimental Biology 136, no. 1 (May 1, 1988): 13–22. http://dx.doi.org/10.1242/jeb.136.1.13.

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Abstract (sommario):

Spermatozoa of rainbow trout and chum salmon, which have no potential for motility in the testis, acquire that potential in the sperm duct. This paper demonstrates that there is little difference between the levels of sodium, potassium, calcium, magnesium, chloride and osmolality of the seminal plasma in the testis and in the sperm duct. However, the bicarbonate concentration of the seminal plasma and the pH value of semen were higher in the sperm duct than in the testis. When immotile spermatozoa obtained from the testis were incubated in artificial seminal plasma with a high pH and containin

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