The annual reproductive cycle and sex inversion of the Picnic seabream, Acanthopagrus berda (Forsskål 1775) from Indian waters: Histological and morphometric description

2019 ◽  
Vol 50 (10) ◽  
pp. 2917-2931
Author(s):  
Shilta Madathampady Thomas ◽  
Suresh Babu Padinhate Purayil ◽  
Chadha Narinder Kumar ◽  
Asokan Pillaru Kandiyil ◽  
Vinod Kavungal ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Indian Waters ◽  
Sex Inversion

Mechanisms underlying pituitary microvascular remodelling in thoroughbred horses during the annual reproductive cycle

2014 ◽  
Author(s):  
Angus Yeomans ◽  
Nichol Thompson ◽  
Jennifer Castle-Miller ◽  
David O Bates ◽  
Domingo Tortonese
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Thoroughbred Horses

scholarly journals Proliferative and Apoptotic Pathways in the Testis of Quail Coturnix coturnix during the Seasonal Reproductive Cycle

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1729
Author(s):  
Sara Falvo ◽  
Luigi Rosati ◽  
Maria Maddalena Di Fiore ◽  
Federica Di Giacomo Russo ◽  
Gabriella Chieffi Baccari ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Second Messengers ◽  
Reproductive Period ◽  
Annual Reproductive Cycle ◽  
Coturnix Coturnix ◽  
Immunohistochemistry Analysis ◽  
17Β Estradiol ◽  
Apoptotic Pathways ◽  
Camp And Cgmp ◽  
Activation Phase

The quail Coturnix coturnix is a seasonal breeding species, with the annual reproductive cycle of its testes comprising an activation phase and a regression phase. Our previous results have proven that the testicular levels of both 17β-estradiol (E2) and androgens are higher during the reproductive period compared to the non-reproductive period, which led us to hypothesize that estrogens and androgens may act synergistically to initiate spermatogenesis. The present study was, therefore, aimed to investigate the estrogen responsive system in quail testis in relation to the reproduction seasonality, with a focus on the molecular pathways elicited in both active and regressive quail testes. Western blotting and immunohistochemistry analysis revealed that the expression of ERα, which is the predominant form of estrogen receptors in quail testis, was correlated with E2 concentration, suggesting that increased levels of E2-induced ERα could play a key role in the resumption of spermatogenesis during the reproductive period, when both PCNA and SYCP3, the mitotic and meiotic markers, respectively, were also increased. In the reproductive period we also found the activation of the ERK1/2 and Akt-1 kinase pathways and an increase in second messengers cAMP and cGMP levels. In the non-reproductive phase, when the E2/ERα levels were low, the inactivation of ERK1/2 and Akt-1 pathways favored apoptotic events due to an increase in the levels of Bax and cytochrome C, with a consequent regression of the gonad.

Peptidergic neurohormonal systems in the basal hypothalamus of the ferret and the mink: Immunocytochemical study of variations during the annual reproductive cycle

1988 ◽  
Vol 251 (1) ◽  
pp. 153-159 ◽  
Author(s):  
L. Boissin-Agasse ◽  
G. Alonso ◽  
G. Roch ◽  
J. Boissin
Keyword(s):  
Reproductive Cycle ◽  
Immunocytochemical Study ◽  
Annual Reproductive Cycle

Annual reproductive cycle of the greasyback shrimp Metapenaeus ensis in Ise Bay, Japan

2021 ◽  
Author(s):  
Fumihiro Yamane ◽  
Katsuyoshi Suitoh ◽  
Takuji Okumura ◽  
Kenji Toyota ◽  
Naoaki Tsutsui ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Metapenaeus Ensis ◽  
Ise Bay

Changes in Proto-oncogene Activity in the Testis of the Frog, Rana esculenta, during the Annual Reproductive Cycle

1995 ◽  
Vol 99 (2) ◽  
pp. 127-136 ◽  
Author(s):  
Paolo Chieffi ◽  
Sergio Minucci ◽  
Gilda Cobellis ◽  
Silvia Fasano ◽  
Riccardo Pierantoni
Keyword(s):  
Reproductive Cycle ◽  
Rana Esculenta ◽  
Annual Reproductive Cycle

Temporal relationship between the circulating profiles of melatonin and ovarian steroids under natural photo-thermal conditions in an annual reproductive cycle in carpCatla catla

2009 ◽  
Vol 40 (4) ◽  
pp. 347-359 ◽  
Author(s):  
Asamanja Chattoraj ◽  
Mohua Seth ◽  
Anupam Basu ◽  
T. G. Shrivastav ◽  
Sepp Porta ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Temporal Relationship ◽  
Thermal Conditions ◽  
Annual Reproductive Cycle ◽  
Ovarian Steroids

Effects of captivity stress on plasma steroid levels in the green frog, rana esculenta, during the annual reproductive cycle

1991 ◽  
Vol 98 (3-4) ◽  
pp. 491-496 ◽  
Author(s):  
Massimo Zerani ◽  
Fabrizia Amabili ◽  
Gilberto Mosconi ◽  
Anna Gobbetti
Keyword(s):  
Reproductive Cycle ◽  
Rana Esculenta ◽  
Green Frog ◽  
Annual Reproductive Cycle
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