Activity of the Ovarian Germinal Epithelium in the Freshwater Catfish, Pimelodus maculatus (Teleostei: Ostariophysi: Siluriformes): Germline Cysts, Follicle Formation and Oocyte Development

dc.creatorQuagio-Grassiotto, I
dc.creatorGrier, H
dc.creatorMazzoni, TS
dc.creatorNobrega, RH
dc.creatorAmorim, JPD
dc.date2011
dc.dateNOV
dc.date2014-07-30T13:43:33Z
dc.date2015-11-26T16:27:24Z
dc.date2014-07-30T13:43:33Z
dc.date2015-11-26T16:27:24Z
dc.date.accessioned2018-03-28T23:08:21Z
dc.date.available2018-03-28T23:08:21Z
dc.identifierJournal Of Morphology. Wiley-blackwell, v. 272, n. 11, n. 1290, n. 1306, 2011.
dc.identifier0362-2525
dc.identifierWOS:000296979700002
dc.identifier10.1002/jmor.10981
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/54180
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/54180
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1269180
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionDistinct types of oogonia are found in the germinal epithelium that borders the ovarian lamellae of Pimelodus maculatus: A-undifferentiated, A-differentiated and B-oogonia. This is similar to the situation observed for spermatogonia in the vertebrate testis. The single A-undifferentiated oogonia divide by mitosis giving rise to A-groups of single differentiated oogonia, each enclosed by epithelial cells that are prefollicle cells. Subsequently, the single A-differentiated oogonia proliferate to generate B-oogonia that are interconnected by cytoplasmic bridges, hence, forming germline cysts. The prefollicle cells associated with them also divide. Within the germline cysts, B-oogonia enter meiosis becoming oocytes. Meiotic prophase and early folliculogenesis occur within the germline cysts. During folliculogenesis, prefollicle cells grow between the oocytes, encompassing and individualizing each of them. The intercellular bridges disappear, and the germline cysts are broken down. Next, a basement membrane begins to form around the nascent follicle, separating an oocyte and its associated prefollicle cells from the cell nest. Folliculogenesis is completed when the oocyte and the now follicle cells are totally encompassed by a basement membrane. Cells derived from the ovarian stroma encompass the newly-formed ovarian follicle, and become the theca, thereby completing the formation of the follicle complex. Follicle complexes remain attached to the germinal epithelium as they share a portion of basement membrane. This attachment site is where the oocyte is released during ovulation. The postovulatory follicle complex is continuous with the germinal epithelium as both are supported by a continuous basement membrane. The findings in P. maculatus reinforce the hypothesis that ovarian follicle formation represents a conserved process throughout vertebrate evolution. J. Morphol. 272:1290-1306, 2011. (C) 2011Wiley-Liss, Inc.
dc.description272
dc.description11
dc.description1290
dc.description1306
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageen
dc.publisherWiley-blackwell
dc.publisherMalden
dc.publisherEUA
dc.relationJournal Of Morphology
dc.relationJ. Morphol.
dc.rightsfechado
dc.rightshttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.sourceWeb of Science
dc.subjectgerminal epithelium
dc.subjectgerm cell nest
dc.subjectgermline cyst
dc.subjectfolliculogenesis
dc.subjectoocyte development
dc.subjectcatfish Pimelodus maculatus
dc.subjectCell Development
dc.subjectStem-cells
dc.subjectFolliculogenesis
dc.subjectDifferentiation
dc.subjectSpermatogenesis
dc.subjectGrowth
dc.subjectMedaka
dc.subjectFish
dc.titleActivity of the Ovarian Germinal Epithelium in the Freshwater Catfish, Pimelodus maculatus (Teleostei: Ostariophysi: Siluriformes): Germline Cysts, Follicle Formation and Oocyte Development
dc.typeArtículos de revistas


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