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Immunoexpression of aromatase and estrogen receptors β in stem spermatogonia of bullfrogs indicates a role of estrogen in the seasonal spermatogonial mitotic activity
(2013-02-01)
Bullfrog stem spermatogonia, also named primordial germ cells (PGCs), show strong testosterone immunolabeling in winter, but no or weak testosterone immunoexpression in summer. Thus, the role of testosterone in these cells ...
Actions and roles of fsh in germinative cells
(2021-09-01)
Follicle stimulating hormone (FSH) is produced by the pituitary gland in a coordinated hypothalamic–pituitary–gonadal (HPG) axis event, plays important roles in reproduction and germ cell development during different phases ...
Studies on the function of heparan sulfate in the C. elegans germ line
(Universidade Federal de São Paulo (UNIFESP), 2016-05-31)
Germline development is a process common to all multicellular organisms and requires tight control of proliferation and stem cell maintenance. The Caenorhabditis elegans hermaphrodite germline was used in this thesis as a ...
Sexual differentiation and primordial germ cell distribution in the early horse fetus
(Multidisciplinary Digital Publishing Institute, 2021-08)
It was the aim of this study to characterize the development of the gonads and genital ducts in the equine fetus around the time of sexual differentiation. This included the identification and localization of the primordial ...
Isolation, in vitro study, and stem cell markers for type A spermatogonia in a Characiformes species
(2020-07-01)
The objective of this study was to establish a protocol for the characterization, isolation, and culture of type A spermatogonia using specific molecular markers for these cells in fish. To this end, adult Prochilodus ...
Expression of hMLH1 and hMSH2 proteins in ameloblastomas and tooth germs
(Medicina Oral S. L., 2018)
Background: Mismatch repair proteins (MMRPs) are a group of nuclear enzymes that participate in the repair of base mismatches that occur during DNA replication in all proliferating cells. The most studied MMRPs are hMSH2 ...
Female germ cell renewal during the annual reproductive cycle in Ostariophysians fish
(2013-03-01)
The objective was to characterize female germ cell renewal during the annual reproductive cycle in two species of ostariophysian fish with distinct reproductive strategies: a siluriform, Pimelodus maculatus, in which oocyte ...
Primordial germ cells (spermatogonial stem cells) of bullfrogs express sex hormone-binding globulin and steroid receptors during seasonal spermatogenesis
(2013-01-01)
In vertebrate species, testosterone seems to inhibit spermatogonial differentiation and proliferation. However, this androgen can also be converted, via aromatase, into estrogen which stimulates spermatogonial differentiation ...
Primordial germ cells (spermatogonial stem cells) of bullfrogs express sex hormone-binding globulin and steroid receptors during seasonal spermatogenesis
(2013-01-01)
In vertebrate species, testosterone seems to inhibit spermatogonial differentiation and proliferation. However, this androgen can also be converted, via aromatase, into estrogen which stimulates spermatogonial differentiation ...