Results 21 to 30 of about 18,364 (206)

Relationship between acrosome integrity changes and in vitro fertilising ability of bovine spermatozoa

Veterinární Medicína, 2015
This study was designed to investigate the characteristics of acrosomal changes during capacitation of bovine spermatozoa in relationship to in vitro fertility of individual bulls.
Z. Reckova, M. Machatkova, L. Machal, M. Jeseta   +3 more
doaj   +1 more source

Ubiquitin Ligase Nrdp1 Controls Autophagy-Associated Acrosome Biogenesis and Mitochondrial Arrangement during Spermiogenesis

Cells, 2023
Autophagy is critical to acrosome biogenesis and mitochondrial quality control, but the underlying mechanisms remain unclear. The ubiquitin ligase Nrdp1/RNF41 promotes ubiquitination of the mitophagy-associated Parkin and interacts with the pro ...
Zi-Yu Luo, Tian-Xia Jiang, Tao Zhang, Ping Xu, Xiao-Bo Qiu   +4 more
doaj   +1 more source

Condensed Mitochondria Assemble Into the Acrosomal Matrix During Spermiogenesis

Frontiers in Cell and Developmental Biology, 2022
Mammalian spermatogenesis is associated with the transient appearance of condensed mitochondria, a singularity of germ cells with unknown function.
Mindong Ren, Mindong Ren, Yang Xu, Colin K. L. Phoon, Hediye Erdjument-Bromage, Hediye Erdjument-Bromage, Thomas A. Neubert, Thomas A. Neubert, Sujith Rajan, M. Mahmood Hussain, Michael Schlame, Michael Schlame   +11 more
doaj   +1 more source

An Overview of The Globozoospermia as A Multigenic Identified Syndrome [PDF]

International Journal of Fertility and Sterility, 2019
Acrosome plays an integral role during fertilization and its absence in individuals with globozoospermia leads to failure of in vitro fertilization (IVF) and oocyte activation post-intracytoplasmic sperm injection (ICSI).
Parastoo Modarres, Marziyeh Tavalaee, Kamran Ghaedi   +2 more
doaj   +1 more source

Ubiquitination Regulates the Morphogenesis and Function of Sperm Organelles

Cells, 2013
It is now understood that protein ubiquitination has diverse cellular functions in eukaryotes. The molecular mechanism and physiological significance of ubiquitin-mediated processes have been extensively studied in yeast, Drosophila and mammalian somatic
Nobuhiro Nakamura
doaj   +1 more source

A mechanism for differential release of acrosomal enzymes during the acrosome reaction [PDF]

Biochemical Journal, 1991
To study the organization of fertilization enzymes in the sperm acrosome, we isolated and characterized two physicochemically distinct acrosomal fractions of guinea-pig spermatozoa. A soluble fraction contained the 25,000-Mr acrosomal autoantigen, AA1, and most of the acrosomal hyaluronidase and dipeptidyl peptidase II activity. A particulate fraction,
D M, Hardy, M N, Oda, D S, Friend, T T, Huang   +3 more
openaire   +2 more sources

Functional sperm assessments of African Lion Panthera leo (Mammalia: Carnivora: Felidae) in field conditions

Journal of Threatened Taxa, 2019
Wild African Lion Panthera leo populations are decreasing due to inbreeding and reduced genetic variability.  Thus, the use of assisted reproduction in the species could one day become essential.
Thiesa Butterby Soler Barbosa, Daniel de Souza Ramos Angrimani, Bruno Rogério Rui, João Diego de Agostini Losano, Luana de Cássia Bicudo, Marcel Henrique Blank, Marcilio Nichi, Cristiane Schilbach Pizzutto   +7 more
doaj   +1 more source

SEQUENTIAL RELEASE OF ACROSOMAL MEMBRANES AND ACROSOMAL ENZYMES OF RAM SPERMATOZOA [PDF]

Reproduction, 1974
Summary. A method involving the treatment of ram spermatozoa with MgCl2 followed by Hyamine 2389 and Triton X-100 is described, which gave selective removal of the acrosomal membranes and acrosomal enzymes. The effect on the individual membranes of ram spermatozoa was evaluated by electron microscopy.
P N, Srivastava, J F, Munnell, C H, Yang, C W, Foley   +3 more
openaire   +2 more sources

Acid Glycohydrolases in Rat Spermatocytes, Spermatids and Spermatozoa: Enzyme Activities, Biosynthesis and Immunolocalization

Biological Procedures Online, 2001
Mammalian sperm acrosome contains several glycohydrolases thought to aid in the dispersion and digestion of vestments surrounding the egg. In this study, we have used multiple approaches to examine the origin of acrosome-associated glycohdyrdolases ...
Abou-Haila Aida, Tulsiani Daulat
doaj   +1 more source

Atypical structure of the nuclear membrane, distribution of nuclear pores and lamin B1 in spermatozoa of patients with complete and partial globozoospermia

Frontiers in Genetics
Globozoospermia is a form of male infertility characterized by spermatozoa with spherical heads lacking acrosomes. The aim of this study was to evaluate ultrastructural and molecular defects in different types of globozoospermia.
Elizaveta Bragina, Elizaveta Bragina, Svetlana Kurchashova, Marina Suhomlinova, Tatiana Gasanova, Svetlana Ermolaeva, Tatyana Sorokina, Eva Kirs, Evgeniy Arifulin, Olga Solovova, Oxana Ryzhkova, Sabina Khayat, Marina Andreeva, Vyacheslav Chernykh, Vyacheslav Chernykh   +14 more
doaj   +1 more source