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Doctoral Thesis
DOI
10.11606/T.17.2000.tde-07112001-095400
Document
Author
Full name
Gisele Zoccal Mingoti
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2000
Supervisor
Committee
Silva, Alzira Amélia Martins Rosa e (President)
Garcia, Joaquim Mansano
Moura, Marcos Dias de
Oliveira Filho, Enoch Borges de
Rodrigues, Jose Antunes
Title in Portuguese
Maturação oocitária associada à esteroidogênese. Papel do soro sanguíneo, albumina sérica e hormônios esteróides.
Keywords in Portuguese
bovino
células do cumulus
esteróide
hormônio
maturação in vitro
oócito
Abstract in Portuguese
Este estudo demonstrou que oócitos bovinos são capazes de progredir normalmente a maturação nuclear até a fase de M II quando cultivados in vitro na presença ou ausência de células da granulosa, na presença ou ausência de soro de vaca nas diversas fases do ciclo estral e/ou SFB e na presença de BSA. A progesterona promoveu um retardo na retomada da meiose, mas não impediu que os oócitos atingissem M II, exceto na concentração de 2,5 µg/ml. Além de promover um retardo inicial na retomada da meiose, a testosterona também prejudicou a progressão da meiose até M II. O estradiol também promoveu este retardo inicial, mas isto foi revertido no final da cultura, onde se verificou que quanto maior a concentração de estradiol até a dose de 5,0 µg/ml, maior a porcentagem de oócitos que atingiram M II. Porém, não se observou diferença significativa da porcentagem de oócitos que atingiram M II após maturação no grupo controle (TCM199 com BSA) e nos grupos onde se adicionou estradiol ao meio, em concentrações crescentes. Verificou-se que as células da granulosa e/ou células do cumulus foram capazes de secretar progesterona e estradiol no meio de cultura, quando estimuladas pelo soro bovino, que lhes forneceu precursores (testosterona). As células do cumulus dos COCs cultivados foram capazes de secretar progesterona quando estimuladas por BSA, SFB e estradiol e foram capazes de secretar estradiol quando estimuladas por BSA, progesterona e testosterona. O trabalho demonstrou que a MIV de oócitos bovinos ocorre normalmente na ausência de soro bovino e na ausência de células foliculares e demonstrou que a adição de estradiol não afeta a maturação e é desnecessária, uma vez que as células do cumulus o produzem no meio durante as 24 horas de cultura.
Title in English
Oocyte maturation associated to steroidogenesis. Effect of serum, BSA and steroid hormones.
Keywords in English
catlle
cumulus cells
hormone
in vitro maturation
oocyte
steroid
Abstract in English
This study has demonstrated that culture medium supplementation with cycling cow serum and/or FCS, granulosa cells or BSA did not affect meiosis progression from GV to M II stage of bovine oocytes matured in vitro. Progesterone impaired meiosis resumption, but it was reverted after 24 hours of culture, except in the concentration of 2,5 µg/ml. Testosterone impaired meiosis resumption and meiosis progression to M II. Estradiol impaired meiosis progression, but it was reverted at the end of the culture, when it was observed that the higher the estradiol concentration in the medium, the higher the number of oocytes reaching M II. However, when IVM of bovine oocytes matured in medium supplemented with only BSA was compared to IVM of bovine oocytes matured in medium supplemented with BSA plus estradiol, no statistical difference was found. Data showed that granulosa cells and/or cumulus cells were able to produce progesterone and estradiol in the culture medium, when stimulated by bovine serum. Cumulus cells were able to produce progesterone when stimulated by BSA, FCS and estradiol and were still able to produce estradiol when stimulated by BSA, progesterone and testosterone. This study has demonstrated that IVM of bovine oocytes can proceed normally in the absence of bovine serum and granulosa cells, and has additionally demonstrated that the medium supplementation with estradiol did not affect nuclear maturation and it is still not necessary, once cumulus cells are able to produce it during the 24 hours of culture.
 
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Publishing Date
2003-07-21
 
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