Atresia Folicular en Ovarios de Prochilodus lineatus

Quintana, Cusma; Cohene, T Blanco; Arbués, R.; Domitrovic, Hugo Alberto; González, J

doi:10.4067/s0717-95022012000400008

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…Com a formação propriamente dita do folículo de Graaf, sendo agora ovócito secundário, envolto pela corona radiata e ocorrendo a desancoragem do cumulus oophorus (Moura, 2018). E alguns folículos desenvolvem o processo de atresia o qual provoca a degeneração e reabsorção do folículo, por isso muitos não conseguem atingir o estágio final (Flores Quintana, 2012).…”

Section: Aparelho Reprodutor Femininounclassified

A pesquisa em saúde: desafios atuais e perspectivas futuras 6

Cavalcanti

2023

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Section: Aparelho Reprodutor Femininounclassified

A pesquisa em saúde: desafios atuais e perspectivas futuras 6

Cavalcanti

2023

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Morphological patterns of cell death in ovarian follicles of primary and secondary growth and postovulatory follicle complex of the annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Domínguez-Castanedo

Uribe

Muñoz-Campos

2019

Journal of Morphology

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The dynamics of cellular development and homeostasis of the ovary depend on the balance between proliferation and cell death throughout the reproductive cycle.Millerichthys robustus is an annual fish whose ovarian follicles develop asynchronously, allowing daily reproduction from sexual maturity until death. The objective of this research is to describe, histologically, the processes of follicular atresia and regression of postovulatory follicular complexes (POC) throughout a reproductive cycle of M. robustus. Patterns of cell death were documented by apoptosis in atretic follicles and POC, and necrosis in the POC after ovulation with an associated inflammatory response. Atretic follicles were seen from the onset of sexual maturity, duringweek three post-hatching (PH), both in primary growth (from the Cortical alveoli step, with folliculogenesis completed) and secondary growth Stages, with a higher prevalence in the latter. POCs were observed in different stages of regression from week four PH until the death of the fish. The apoptotic characteristics found were:(i) fragmentation of the nuclear membrane and zona pellucida, and liquefaction of the cortical alveoli and yolk; (ii) follicular cells becoming phagocytic, increasing their size, and migrating within the oocyte; and (iii) formation of an intrafollicular lumen, a product of phagocytosis of the oocyte constituents and dispersed pigments that remain after the digestion of yolk and cortical alveoli. The morphological changes of the follicular cells of the POC, from a squamous morphology after ovulation to columnar during its regression with PAS+ contents, was documented, suggesting a secretory activity.

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Histomorphological study of ovarian atresia over the reproductive cycle of Octopus vulgaris from Galician waters (NW Spain)

2016

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Atresia has been poorly examined in cephalopods. We here provide a histological 12 description of this process along the whole ovary development for Octopus vulgaris. 13 Additionally, we related its occurrence to morphometric parameters, and its seasonal 14 cycle was further analysed. Atresia occurred all year round in immature and mature 15 females and in previtellogenic and vitellogenic oocytes. However, more mature females 16 were more prone of being atretic. This occurred mainly in spring when females had 17 atretic previtellogenic oocytes in mature macrostages. By contrast, vitellogenic atresia 18 occurred mainly from spawning to post-spawning females. Furthermore, two types of 19 phagocytic cells were identified as responsible for the reabsorption during atresia. The 20 phagocytic follicle cells only occurred in yolk-bearing oocytes; and within the two 21 haemocyte populations only the smaller ones seemed to be involved in engulfing atretic 22 oocytes. Additionally, advanced atresia in post-spawning females showed yellow-brown 23 bodies as a possible result of follicle cell apoptosis and highlighting the end of the 24 reproductive cycle. Given the pattern of atresia, the reproductive strategy of this species 25 Manuscript Click here to download Manuscript Atresia O. vulgaris ZOOMORPHOLOGY.doc Click here to view linked References is based on an asynchronic ovary development and a synchronous ovulation during 26 spawning. We further suggest that potential fecundity for this species should be 27 measured on late vitellogenic oocytes in pre-spawning females. 28 35 external factors. Thus, since ovarian atresia affects fertility rates, its determination 36 allows to differentiate between potential and total fecundity and to identify at what stage 37 of sexual maturity fecundity is reduced (Boyle & Chevis, 1992). In the case of 38 iteroparous species such as fishes, defining atretic stages and the subsequent assignment 39 of females to different spawning status (e.g. active, inactive/immature) are of great 40 importance for later estimation of spawning biomass (Hunter & Macewicz, 1985; 41 Hunter & Lo, 1997). Moreover, the study of prevalence and intensity of histological 42 stages of the atretic oocytes allows predicting the cessation of spawning for a given 43 population (Kurita et al., 2003; Ganias et al., 2003). Furthermore, atresia is essential for 44 the maintenance of ovarian homeostasis; however, a number of factors have been 45 described as potential causes of increased ovarian atresia such as marine pollution or 46 reduced food supply (Cabrera-Páez et al., 2009; Ortiz-Zarragoitia et al., 2011; 47 Yamamoto et al., 2011). Thus, besides indicating a poorer physiological condition for 48 reproduction, elevated atretic indices could also reflect an environmental impact. 49 Gonadal atresia can appear at any stage of oocyte development; however, it is 50 mainly described in vitellogenic oocytes in both marine vertebrates and invertebrates. 51 By contrast, atresia in previtellogenic oocytes is less evident becaus...

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Atresia Folicular en Ovarios de Prochilodus lineatus

Cited by 7 publications

References 18 publications

A pesquisa em saúde: desafios atuais e perspectivas futuras 6

A pesquisa em saúde: desafios atuais e perspectivas futuras 6

Morphological patterns of cell death in ovarian follicles of primary and secondary growth and postovulatory follicle complex of the annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Histomorphological study of ovarian atresia over the reproductive cycle of Octopus vulgaris from Galician waters (NW Spain)

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