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Author: Alejandro Vicente Carrillo
Publisher: Linköping University Electronic Press
ISBN: 9176857263
Category :
Languages : en
Pages : 82
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Book Description
Internal fertilization usually implies that a spermatozoon, with intact attributes for zygote formation, passes all hurdles during its transport through the female genitalia and reaches the oocyte. During this journey, millions to billions of other spermatozoa perish. Spermatozoa are highly differentiated motile cells without synthetic capabilities. They generate energy via glycolysis and oxidative phosphorylation to sustain motility and to maintain the stability and functionality of their plasma membrane. In vivo, they spend their short lifespan bathing in female genital tract fluids of different origins, or are in vitro exposed to defined media during diverse sperm handling i.e. extension, cryopreservation, in vitro fertilization, etc. Being excitable cells, spermatozoa respond in vivo to various stimuli during pre-fertilization (capacitation, hyperactivation, oocyte location) and fertilization (acrosome reaction, interaction with the oocyte) events, mediated via diverse membrane ion-conducting channels and ligand-gated receptors. The present Thesis has mapped the presence and reactivity (sperm intactness and kinematics) of selected receptors, water and ion channels in ejaculated boar spermatozoa. The final aim was to find a relevant alternative cell type for in vitro bioassays that could ease the early scrutiny of candidate drugs as well as decreasing our needs for experimental animals according to the 3R principles. Spermatozoa are often extended, cooled and thawed to warrant their availability as fertile gametes for breeding or in vitro testing. Such manipulations stress the cells via osmotic variations and hence spermatozoa need to maintain membrane intactness by controlling the exchange of water and the common cryoprotectant glycerol, via aquaporins (AQPs). Both AQPs-7 and -9 were studied for membrane domain changes in cauda- and ejaculated spermatozoa (un-processed, extended, chilled or frozen-thawed). While AQP-9 maintained location through source and handling, thawing of ejaculated spermatozoa clearly relocated the labelling of AQP-7, thus appearing as a relevant marker for non-empirical studies of sperm cryopreservation. Alongside water, spermatozoa interact with calcium (Ca2+) via the main Ca2+ sperm channel CatSper. Increments in intracellular Ca2+ initiate motility hyperactivation and the acrosome reaction. The four subunits of the CatSper channel were present in boar spermatozoa, mediating changes in sperm motility under in vitro capacitation-inducing conditions (increased extracellular Ca2+ availability and bicarbonate) or challenge by the CatSper antagonists mibefradil and NNC 55-0396. Uterine and oviduct fluids are richest in endogenous opioids as ?-endorphins during mating and ovulation. Both ?- and ?- opioid receptors were present in boar spermatozoa modulating sperm motility, as in vitro challenge with known agonists (?: morphine; ?: DPDPE and ?: U 50488) and antagonists (?: naloxone; ?: naltrindole and ?: nor-binaltrorphimine) showed that the ?-opioid receptor maintained or increased motility while the ?-opioid receptor mediated decreased motility over time. Finally, boar spermatozoa depicted dose-response effects on sperm kinematics and mitochondrial potential following in vitro challenge with 130 pharmacological drugs and toxic compounds as well as with eight known mito-toxic compounds. In conclusion, boar spermatozoa expressing functional water (AQPs-7 and -9) and ion (CatSper 1-4) channels as well as ?- and ?-opioid receptors are able to adapt to stressful environmental variations, capacitation and pharmacological compounds and drug components. Ejaculated sperm suspensions are easily and painlessly obtained from breeding boars, and are suitable biosensors for in vitro drug-induced testing, complying with the 3R principles of reduction and replacement of experimental animals, during early toxicology screening.
Author: Alejandro Vicente Carrillo
Publisher: Linköping University Electronic Press
ISBN: 9176857263
Category :
Languages : en
Pages : 82
Get Book Here
Book Description
Internal fertilization usually implies that a spermatozoon, with intact attributes for zygote formation, passes all hurdles during its transport through the female genitalia and reaches the oocyte. During this journey, millions to billions of other spermatozoa perish. Spermatozoa are highly differentiated motile cells without synthetic capabilities. They generate energy via glycolysis and oxidative phosphorylation to sustain motility and to maintain the stability and functionality of their plasma membrane. In vivo, they spend their short lifespan bathing in female genital tract fluids of different origins, or are in vitro exposed to defined media during diverse sperm handling i.e. extension, cryopreservation, in vitro fertilization, etc. Being excitable cells, spermatozoa respond in vivo to various stimuli during pre-fertilization (capacitation, hyperactivation, oocyte location) and fertilization (acrosome reaction, interaction with the oocyte) events, mediated via diverse membrane ion-conducting channels and ligand-gated receptors. The present Thesis has mapped the presence and reactivity (sperm intactness and kinematics) of selected receptors, water and ion channels in ejaculated boar spermatozoa. The final aim was to find a relevant alternative cell type for in vitro bioassays that could ease the early scrutiny of candidate drugs as well as decreasing our needs for experimental animals according to the 3R principles. Spermatozoa are often extended, cooled and thawed to warrant their availability as fertile gametes for breeding or in vitro testing. Such manipulations stress the cells via osmotic variations and hence spermatozoa need to maintain membrane intactness by controlling the exchange of water and the common cryoprotectant glycerol, via aquaporins (AQPs). Both AQPs-7 and -9 were studied for membrane domain changes in cauda- and ejaculated spermatozoa (un-processed, extended, chilled or frozen-thawed). While AQP-9 maintained location through source and handling, thawing of ejaculated spermatozoa clearly relocated the labelling of AQP-7, thus appearing as a relevant marker for non-empirical studies of sperm cryopreservation. Alongside water, spermatozoa interact with calcium (Ca2+) via the main Ca2+ sperm channel CatSper. Increments in intracellular Ca2+ initiate motility hyperactivation and the acrosome reaction. The four subunits of the CatSper channel were present in boar spermatozoa, mediating changes in sperm motility under in vitro capacitation-inducing conditions (increased extracellular Ca2+ availability and bicarbonate) or challenge by the CatSper antagonists mibefradil and NNC 55-0396. Uterine and oviduct fluids are richest in endogenous opioids as ?-endorphins during mating and ovulation. Both ?- and ?- opioid receptors were present in boar spermatozoa modulating sperm motility, as in vitro challenge with known agonists (?: morphine; ?: DPDPE and ?: U 50488) and antagonists (?: naloxone; ?: naltrindole and ?: nor-binaltrorphimine) showed that the ?-opioid receptor maintained or increased motility while the ?-opioid receptor mediated decreased motility over time. Finally, boar spermatozoa depicted dose-response effects on sperm kinematics and mitochondrial potential following in vitro challenge with 130 pharmacological drugs and toxic compounds as well as with eight known mito-toxic compounds. In conclusion, boar spermatozoa expressing functional water (AQPs-7 and -9) and ion (CatSper 1-4) channels as well as ?- and ?-opioid receptors are able to adapt to stressful environmental variations, capacitation and pharmacological compounds and drug components. Ejaculated sperm suspensions are easily and painlessly obtained from breeding boars, and are suitable biosensors for in vitro drug-induced testing, complying with the 3R principles of reduction and replacement of experimental animals, during early toxicology screening.
Author: Lori Barnard
Publisher: Humana Press
ISBN: 9781627030373
Category : Science
Languages : en
Pages : 0
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Book Description
Deficiencies in sperm function are usually the result of spermatogenic defects. Spermatogenesis is a biologically complex and essential process during which spermatogonia undergo meiotic recombination, reduction of the genome to a haploid state, and extensive cellular modifications that result in a motile cell capable of traversing the female reproductive tract, withstanding various potential assaults to viability, and finally successfully fertilizing a mature oocyte to give rise to an embryo. Defects in any step of spermatogenesis or spermatogenesis can lead to male infertility, a disease that affects approximately 5-7% of the population. Spermiogenesis and Spermatogenesis: Methods and Protocols details protocols used in the study of spermatogenesis, clinical analytical protocols, and basic techniques used in clinical andrology laboratories, such as obtaining accurate results for a sperm count, and advanced procedures, such as genome-wide genetic study tools and evaluation of nuclear proteins. Written in the successful Methods in Molecular BiologyTM series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Spermiogenesis and Spermatogenesis: Methods and Protocols is unique in its breadth, and will be a useful reference for clinicians and researchers alike.
Author: Satish Kumar Gupta
Publisher: Springer Science & Business Media
ISBN: 9780792359234
Category : Medical
Languages : en
Pages : 430
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Book Description
Papers presented at the VII International Congress of Reproductive Immunology held from 27-30 October 1998, New Delhi ; organised by National Institute of Immunology.
Author: Eberhard Nieschlag
Publisher: Springer Science & Business Media
ISBN: 3540783555
Category : Medical
Languages : en
Pages : 630
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Book Description
The decade that has passed since publication of the second edition of this textbook has not only witnessed a tremendous increase in knowledge within the ? eld of and- logy, but also seen the ? eld itself achieve a newfound status within the medical p- fession. Knowledge and status have been of mutual bene? t to the ? eld and the growing critical mass of diagnostic and therapeutic possibilities have caused andrology to be recognized as a medical subspecialty in some countries such as Germany, Poland, and Estonia. The European Academy of Andrology (EAA) served as a pacemaker for this development and continues to strive for establishment of andrology as a clinical ? eld. Well-designed curricula and qualifying examinations have contributed to the of? cial recognition of andrology as a speciality. This recognition of the ? eld helps patients with andrological problems to ? nd the specialist they seek. This textbook summarizes the current state of knowledge in the ? eld of andrology. It is a source of knowledge to all those who are or want to become andrologists. In addition, as andrology is clearly an interdisciplinary ? eld, this book may serve as a compendium and source of reference for all those physicians and biologists active in neighboring areas, who want to obtain an overview of andrology and who require information on special problems. The extensive references are timely and up to date.
Author: Marek Gzik
Publisher: Springer Nature
ISBN: 3030991121
Category : Technology & Engineering
Languages : en
Pages : 341
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Book Description
This book presents the latest developments in the field of biomedical engineering and includes practical solutions and strictly scientific considerations. The development of new methods of treatment, advanced diagnostics or personalized rehabilitation requires close cooperation of experts from many fields, including, among others, medicine, biotechnology and finally biomedical engineering. The latter, combining many fields of science, such as computer science, materials science, biomechanics, electronics not only enables the development and production of modern medical equipment, but also participates in the development of new directions and methods of treatment. The presented monograph is a collection of scientific papers on the use of engineering methods in medicine. The topics of the work include both practical solutions and strictly scientific considerations expanding knowledge about the functioning of the human body. We believe that the presented works will have an impact on the development of the field of science, which is biomedical engineering, constituting a contribution to the discussion on the directions of development of cooperation between doctors, physiotherapists and engineers. We would also like to thank all the people who contributed to the creation of this monograph—both the authors of all the works and those involved in technical works.
Author: Tomaz Jarm
Publisher: Springer Nature
ISBN: 3030646106
Category : Technology & Engineering
Languages : en
Pages : 1198
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Book Description
This book aims at informing on new trends, challenges and solutions, in the multidisciplinary field of biomedical engineering. It covers traditional biomedical engineering topics, as well as innovative applications such as artificial intelligence in health care, tissue engineering , neurotechnology and wearable devices. Further topics include mobile health and electroporation-based technologies, as well as new treatments in medicine. Gathering the proceedings of the 8th European Medical and Biological Engineering Conference (EMBEC 2020), held on November 29 - December 3, 2020, in Portorož, Slovenia, this book bridges fundamental and clinically-oriented research, emphasizing the role of education, translational research and commercialization of new ideas in biomedical engineering. It aims at inspiring and fostering communication and collaboration between engineers, physicists, biologists, physicians and other professionals dealing with cutting-edge themes in and advanced technologies serving the broad field of biomedical engineering.
Author: Anne M. Jequier
Publisher: John Wiley & Sons
ISBN: 0470695269
Category : Medical
Languages : en
Pages : 386
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Book Description
This unique book deals almost wholly with the clinical aspects of the subject. Male Infertility is a book written by a clinician for clinicians, most frequently gynaecologists who are battling to understand reproductive pathology in the infertile male patient. It is intended to familiarize the gynaecologist and other interested clinicians in the clinical management of an infertile man and provide that individual with practical guidance to a clinical problem.
Author: William J. Bell
Publisher: JHU Press
ISBN: 0801891752
Category : Science
Languages : en
Pages : 781
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Book Description
The essential volume on the biology and behavior of these remarkable insects. “This transformative work will be an inspiration to students of entomology.” —Choice The cockroach is truly an evolutionary wonder. This definitive volume provides a complete overview of suborder Blattaria, highlighting the diversity of these amazing insects in their natural environments. Beginning with a foreword by Edward O. Wilson, the book explores the fascinating natural history and behavior of cockroaches, describing their various colors, sizes, and shapes, as well as how they move on land, in water, and through the air. In addition to habitat use, diet, reproduction, and behavior, Cockroaches covers aspects of cockroach biology, such as the relationship between cockroaches and microbes, termites as social cockroaches, and the ecological impact of the suborder. With over 100 illustrations, an expanded glossary, and an invaluable set of references, this work is destined to become the classic book on the Blattaria. Students and research entomologists can mine each chapter for new ideas, new perspectives, and new directions for future study. “Well-written . . . visually attractive . . . This book is much needed to educate biologists about the fascinating biology and diversity of cockroaches.” —Integrative and Comparative Biology “A must-have for any insect hobbyest.” —Allpet Roaches Forum “This contribution is an important source of information on cockroach natural history and diversity.” —The Quarterly Review of Biology “Suitable for researchers, students, and naturalists, chapters are topical, exploring the diversity of cockroaches.” —Southeastern Naturalist
Author: David Mortimer
Publisher: Oxford University Press, USA
ISBN: 9780195065954
Category : Andrology
Languages : en
Pages : 424
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Book Description
This practical manual on sperm analysis presents the diagnostic and therapeutic procedures that are used in andrology laboratories to analyze and assess male infertility. Diagnostic areas include: semen analysis and the biochemical, immunological and microbiological examination of human semen and spermatozoa; computer-aided sperm motility analysis; sperm ultrastructure; and assessment of sperm transport through the female tract and sperm fertilizing ability. The clinical relevance of various diagnostic procedures is also discussed. Therapeutic topics include sperm washing techniques, semen cryopreservation, and insemination procedures. The volume also covers safety in the andrology laboratory, technician training, and quality control. The text is extensively illustrated and will be an invaluable resource to all scientists and technicians who diagnose male infertility. It will also be of interest to researchers working in human gamete biology and reproductive physiology. The detailed methods described in the book are relevant to all hospital, commercial, and university laboratories involved in infertility diagnosis and treatment.
Author: Vinod Kumar Yata
Publisher:
ISBN: 9783030765309
Category :
Languages : en
Pages : 0
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Book Description
This book reviews concepts and recent advances of biotechnological approaches for livestock production. Indeed, biotechnologies have recently emerged as powerful tools for animal breeding, genetics, production, nutrition, and animal health. Applications to the production of livestock such as cattle, camel, and poultry are detailed. Chapters also present biotechnological applications for diagnostics, animal nutrition, and animal food production.
