infertility/tyrosine

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Diagnosis and prognosis of male infertility in mammal: the focusing of tyrosine phosphorylation and phosphotyrosine proteins.

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Male infertility refers to the inability of a man to achieve a pregnancy in a fertile female. In more than one-third of cases, infertility arises due to the male factor. Therefore, developing strategies for the diagnosis and prognosis of male infertility is critical. Simultaneously, a satisfactory

A Novel Combination of γ-Tocopherol-Rich Mixture of Tocopherols and Ascorbic Acid Restores Fertility in Cases of Tyrosine Nitration-Associated Male Infertility in Mice

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Infertility is an important health problem that affects up to 16% of couples worldwide. Male infertility is responsible for 50% of the cases. Currently, a physical examination, hormone profiling and the evaluation of two consecutive semen samples (to determine the sperm concentration, motility,

The cause of infertility of male c-ros tyrosine kinase receptor knockout mice.

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Male homozygous transgenic c-ros knockout mice are sterile by natural mating, lack a part of their epididymis, and the epididymal sperm exhibit tail angulation in vivo and in vitro. To ascertain if this abnormal tail form caused the infertility, the number and nature of sperm in the tract of females

Targeted disruption of tyrosylprotein sulfotransferase-2, an enzyme that catalyzes post-translational protein tyrosine O-sulfation, causes male infertility.

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Tyrosine O-sulfation is a post-translational modification mediated by one of two Golgi tyrosylprotein sulfotransferases (TPST-1 and -2) expressed in all mammalian cells. Tyrosine sulfation plays an important role in the function of some known TPST substrates by enhancing protein-protein

Disruption of Ttll5/stamp gene (tubulin tyrosine ligase-like protein 5/SRC-1 and TIF2-associated modulatory protein gene) in male mice causes sperm malformation and infertility.

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TTLL5/STAMP (tubulin tyrosine ligase-like family member 5) has multiple activities in cells. TTLL5 is one of 13 TTLLs, has polyglutamylation activity, augments the activity of p160 coactivators (SRC-1 and TIF2) in glucocorticoid receptor-regulated gene induction and repression, and displays

Deletion of the tyrosine phosphatase Shp2 in Sertoli cells causes infertility in mice.

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The male's ability to reproduce is completely dependent on Sertoli cells. However, the mechanisms governing the functional integrity of Sertoli cells have remained largely unexplored. Here, we demonstrate that deletion of Shp2 in Sertoli cells results in infertility in mice. In Shp2 knockout mice

Selected genetic factors associated with male infertility.

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Studies into the mechanisms underlying spermatogenesis, the process by which spermatogonia undergo meiosis to become spermatozoa, have identified a number of genetic determinants of male infertility. Indeed, a more comprehensive knowledge of the genetic regulation of spermatogenesis has alleviated

The changes of cortactin p80/85 isoform profiles and tyrosine phosphorylation status during spermatogenesis in the mouse testis.

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Cortactin--an F-actin-binding protein--regulates actin polymerization and plays an important role in cytoskeleton actin dynamics. Cortactin functions are reportedly regulated by changes in its isoform (p80/85) profiles and phosphorylation status. Although essential for spermatogenesis, the exact

Mer receptor tyrosine kinase is a novel therapeutic target in pediatric B-cell acute lymphoblastic leukemia.

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Acute lymphoblastic leukemia (ALL) is currently treated with an intense regimen of chemotherapy yielding cure rates near 80%. However, additional changes using available drugs are unlikely to provide significant improvement in survival. New therapies are warranted given the risk of severe

[Synthesis and preliminary studies of O-(2-[18F] fluoroethyl)-L-tyrosine as a positron emission tomography imaging agent].

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OBJECTIVE To develop a 18F-labeled amino acid, O-(2-[18F]fluoroethyl) - L-tyrosine(18F-FET), as a positron emission tomography (PET) tracer for imaging cerebral tumors. METHODS 18F-FET was synthesized. Preclinical studies including sterility, endotoxin, and toxicity tests were performed. Two brain

Protein tyrosine kinase 7 is essential for tubular morphogenesis of the Wolffian duct.

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The Wolffian duct, the proximal end of the mesonephric duct, undergoes non-branching morphogenesis to achieve an optimal length and size for sperm maturation. It is important to examine the mechanisms by which the developing mouse Wolffian duct elongates and coils for without proper morphogenesis,

Roles of Sialic Acid, AXL, and MER Receptor Tyrosine Kinases in Mumps Virus Infection of Mouse Sertoli and Leydig Cells

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The mumps virus (MuV) causes epidemic parotitis. MuV also frequently infects the testis and induces orchitis, an important etiological factor contributing to male infertility. However, mechanisms underlying MuV infection of the testis remain unknown. Here, we describe that sialic acid, AXL, and MER

Azoospermia in mice with targeted disruption of the Brek/Lmtk2 (brain-enriched kinase/lemur tyrosine kinase 2) gene.

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Brek/Lmtk2 (brain-enriched kinase/lemur tyrosine kinase 2) is a member of the Aatyk family of kinases that comprises Aatyk1, Brek/Lmtk2/Aatyk2, and Aatyk3. Although several potential roles have been proposed for Brek and other Aatyk family members, the physiological functions of these kinases remain

DNA rearrangements located over 100 kb 5' of the Steel (Sl)-coding region in Steel-panda and Steel-contrasted mice deregulate Sl expression and cause female sterility by disrupting ovarian follicle development.

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The Steel (Sl) locus is essential for the development of germ cells, hematopoietic cells, and melanocytes and encodes a growth factor (Mgf) that is the ligand for c-kit, a receptor tyrosine kinase encoded by the W locus. We have identified the molecular and germ cell defects in two mutant Sl

Molecular genetics of male infertility: stem cell factor/c-kit system.

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OBJECTIVE Infertility, affects about 5% of human males and genetic factors are recognized in approximately 30% of them. The mouse represents a good model to study autosomal genes that might play a role in spermatogenesis. In mice, mutations in the c-kit gene and in the gene encoding stem cell factor

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