In fish, both pituitary gonadotropins LH and FSH stimulate gonadal sex steroid hormone production directly by activating Leydig cells. Information is reviewed on the effects of progestin, androgens, and estrogens on global testicular gene expression patterns (microarray analysis), and on the molecular ...
We will therefore discuss how the two pituitary gonadotropins, follicle-stimulating hormone (Fsh) and luteinizing hormone (Lh), regulate testicular functions in fish. This involves the production of locally acting signaling molecules, such as sex steroids and growth factors, in turn modulating germ ...
Despite the fact that sperm from zebra fish, a species evolutionarily distinct from human, lack protamines, they possess remarkably similar bivalent epigenetic modifications on developmental regulator loci that correlate with an earlier embryonic timing of gene activation [41]. Taken together, these ...
vitellogenesis takes place inside modified mitochondria. In other vertebrates, the yolk is not synthesized in the oocytes but is produced in the liver of the body of the female. It is then transported in a soluble form via blood to the follicle cells of the oocytes...
The shark family, Sphyrnidae, consists of nine species of which three are found in South African oceans. One of the three Sphyrnidae species, the scalloped hammerhead (Sphyrna lewini) are the most common, but their biology and mode of reproduction are not extensively studied in terms of ...
Spermatogenic Ultrastructure of the Grunting Toadfish Allenbatrachus grunniens (Batrachoididae) Article 01 May 2021 New spermatological characteristics in the Hemiuroidea inferred from the ultrastructure of the spermatozoon of Gonocerca phycidis a stomach parasite of Gephyroberyx darwinii (Teleostei...
Spermatogenesis in fish (vol 165, pg 390, 2010) Most of our knowledge of transcriptional regulation comes from studies in somatic cells. However, increasing evidence reveals that gene regulation mechanis... DF Rw,L Lr 被引量: 779发表: 2010年 ...
crosses,fish,infinitysignsaschiasmatamovetowardtheendsofthepaired chromatidsofthehomologous chromosomes (called terminalization). Eventually desynapsis is completed and the homologues separate from one and other completely and metaphase begins. First meiotic prophase: ...
Mechanisms that regulate spermatogenesis in mice are important to define as they often apply to fertility in man. We previously showed that conditional deletion of the mouse Mgat1 gene (Mgat1 cKO) in spermatogonia causes a germ-cell autonomous defect lea
Firstly, FSH stimulates the production is 11-KT, the main androgen in fish. This androgen stimulates the proliferation and differentiation of the spermatogonia via the Sertoli cells. FSH further down-regulates the release of anti-Müllerian hormone (AMH), an Sertoli cells derived growth factor that...