PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Oberlender G., Murgas L.D.S., Zangeronimo M.G., Pontelo T.P., Menezes T.A. & Silva A.C. 2013. Porcine follicular fluid concentration of free insulin-like growth factor-I collected from different diameter ovarian follicles. Pesquisa Veterinária Brasileira 33(10):1269-1274. Setor de Fisiologia e Farmacologia Veterinárias, Departamento de Medicina Veterinária, Universidade Federal de Lavras, Campus Universitário s/n, Cx. Postal 3037, Lavras, MG 37200-000, Brazil. E-mail: guilherme.oberlender@uffs.edu.br The study aimed to quantify the concentrations of free IGF-I in serum and fluid of ovarian follicles in pre-pubertal gilts and describe the ovarian morphology by measuring the size of the ovaries and counting the number of surface follicles. Ovaries (n=1,000) from pre-pubertal gilts were obtained immediately after slaughter. A total of 10 samplings were performed, with ovaries obtained from 50 females for each collection. The follicles situated on the surface of each ovary were classified as small (SFs, 2 to 5mm in diameter) or large (LFs 6 to 10mm in diameter) and the follicular fluid was obtained by follicle aspiration. The collection of serum samples was performed after the gilts exsanguination using sterile tubes. From the pool of serum and follicular fluid obtained from 50 females, the concentration of free IGF-I was determined in each sample using an enzyme immunoassay kit (ELISA). The description of ovarian morphometry was performed in 100 ovaries from randomly selected gilts. The larger and smaller lengths of ovaries were measured, and the total number of SFs and LFs present on the surface of each ovary were also counted. The IGF-I concentration was greater (P<0.05) in LFs (170.92±88.29 ng/mL) compared with SFs (67.39±49.90ng/mL) and serum (73.48±34.63ng/mL). The largest and smallest length of the ovaries was 26.0±3.0 and 19.0mm ±2.0mm, respectively. The number of SFs (70.86±25.76) was greater (P<0.01) than LFs (6.54±5.26). The study concluded that LFs present greater levels of IGF-I when compared with SFs and blood, which is related to increased activity of the LFs and its differentiation to ovulation. In addition, ovaries of pre-pubertal gilts have a higher number of SFs compared to LFs. Therefore, our study demonstrated unique data regarding the physiological concentration of free IGF-I in ovarian follicles, that can be used in future research to evaluate the addition of this hormone in the in vitro production media of porcine embryos with the goal to improve the technique efficiency.

• Follicular development ovarian morphometry desenvolvimento folicular morfometria ovariana

Abstract in Portuguese:

RESUMO.- Oberlender G., Murgas L.D.S., Zangeronimo M.G., Pontelo T.P., Menezes T.A. & Silva A.C. 2013. Porcine follicular fluid concentration of free insulin-like growth factor-I collected from different diameter ovarian follicles. Pesquisa Veterinária Brasileira 33(10):1269-1274. Setor de Fisiologia e Farmacologia Veterinárias, Departamento de Medicina Veterinária, Universidade Federal de Lavras, Campus Universitário s/n, Cx. Postal 3037, Lavras, MG 37200-000, Brazil. E-mail: guilherme.oberlender@uffs.edu.br Objetivou-se quantificar as concentrações do IGF-I livre no soro e no fluido de folículos ovarianos de fêmeas suínas pré-púberes e descrever a morfologia ovariana, por meio da mensuração das dimensões dos ovários e da contagem do número de folículos superficiais. Ovários (n=1.000) foram obtidos de fêmeas pré-púberes imediatamente após o abate. Foi realizado um total de 10 coletas, sendo em cada, obtidos ovários de 50 fêmeas. Os folículos localizados na superfície de cada ovário foram classificados em pequenos (FPs, 2-5mm de diâmetro) ou grandes (FGs, 6-10mm de diâmetro) e o fluido folicular foi obtido por aspiração dos folículos. A coleta do soro foi realizada após a exsanguinação das fêmeas com o uso de tubos estéreis. A partir do pool de fluido folicular e do soro obtido das 50 fêmeas, determinou-se a concentração de IGF-I livre em cada amostra por meio de kit de ensaio imunoenzimático (ELISA). A descrição da morfometria ovariana foi realizada em 100 ovários provenientes de fêmeas escolhidas aleatoriamente. Foi mensurado o comprimento maior e menor dos ovários e, também, contabilizado o número total de FPs e FGs presentes na superfície de cada ovário. A concentração de IGF-I foi superior (P<0,05) nos FGs (170,92±88,29ng/mL) em comparação com os FPs (67,39±49,90ng/mL) e o sérico (73,48±34,63ng/mL). O comprimento maior e menor dos ovários foi de 26,0±3,0mm e 19,0±2,0 mm, respectivamente. O número de FPs (70,86±25,76) foi maior (P<0,01) em comparação com os FGs (6,54±5,26). Conclui-se que FGs apresentam níveis de IGF-I superiores aos FPs, e ao sangue, sendo isso relacionado a maior atividade dos FGs e à diferenciação que os mesmos sofrem para a ovulação. Além disso, ovários de fêmeas suínas pré-púberes apresentam elevado número de FPs em comparação aos FGs. Portanto, nosso estudo demonstrou dados originais a respeito da concentração fisiológica de IGF-I livre em folículos ovarianos, que podem ser utilizados em futuras pesquisas para avaliar a adição desse hormônio nos meios de produção in vitro de embriões suínos com o objetivo de melhorar a eficiência da técnica.

Abstract in English:

ABSTRACT.- Rocha T.L.,Yamada A.T., Mazaro e Costa R. & Sabóia-Morais S.M.T. 2011. [Analyses of the development and glycoproteins present in the ovarian follicles of Poecilia vivipara (Cyprinodontiformes, Poeciliidae).] Análise do desenvolvimento e das glicoproteínas presentes nos folículos ovarianos de Poecilia vivipara (Cyprinodontiformes, Poeciliidae). Pesquisa Veterinária Brasileira 31(1):87-93. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com The morphofunctional aspects of oogenesis of Poecilia vivipara were studied aiming to understand the reproductive biology and development of species with internal fertilization, particularly those belonging to the family Poeciliidae. The stages of gonadal maturation and follicular development were characterized using mesoscopic, histological, histochemical, and lectin cytochemical analyses. Through mesoscopic evaluation the ovarian development was classified in six phases of development: immature, in maturation I, in maturation II, mature I, mature II, and post-spawn. Based on microscopic examination of the ovaries, we identified the presence of oocytes types I and II during the previtellogenic phase and types III, IV, and V during the vitellogenic phase. As oogenesis proceeded the oocyte cytosol increased in volume and presented increased cytoplasmic granule accumulation, characterizing vitellogenesis. The zona radiata (ZR) increased in thickness and complexity, and the follicular epithelium, which was initially thin and consisting of pavimentous cells, in type III oocytes exhibited cubic simple cells. The histochemical and cytochemical analyses revealed alterations in the composition of the molecular structures that form the ovarian follicle throughout the gonadal development. Our study demonstrated differences in the female reproductive system among fish species with internal and external fertilization and we suggest P. vivipara can be used as experimental model to test environmental toxicity.

• Ovarian follicles Poecilia vivipara Cyprinodontiformes Poeciliidae folículos ovarianos

Abstract in Portuguese:

RESUMO.- Rocha T.L.,Yamada A.T., Mazaro e Costa R. & Sabóia-Morais S.M.T. 2011. [Analyses of the development and glycoproteins present in the ovarian follicles of Poecilia vivipara (Cyprinodontiformes, Poeciliidae).] Análise do desenvolvimento e das glicoproteínas presentes nos folículos ovarianos de Poecilia vivipara (Cyprinodontiformes, Poeciliidae). Pesquisa Veterinária Brasileira 31(1):87-93. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com