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• W2105611070 abstract "In Heteropneustes fossilis, in vitro incubation of postvitellogenic follicles with 2-hydroxyestradiol-17beta (2-OHE2, 5 micromol l(-1)) decreased significantly the total cAMP level, concomitant with germinal vesicle breakdown (GVBD). The incubation of the follicles with cAMP or cAMP-elevating drugs [phosphodiesterase (PDE) inhibitors], such as IBMX (3-isobutyl-1-methyl-xanthine), theophylline and caffeine, inhibited the 2-OHE2-induced GVBD in a concentration-dependent manner. The magnitude of the response varied: both cAMP and IBMX were effective at all concentrations (0.1-2.0 mmol l(-1)), followed by theophylline (0.5-2.0 mmol l(-1)) and caffeine (1-2.0 mmol l(-1)). The protein kinase A (PKA) inhibitor H89 stimulated oocyte maturation in a concentration-dependent manner. However, when co-incubated with 2-OHE2 for 24 h it produced a biphasic effect: low concentrations (0.1 and 1.0 micromol l(-1)) did not alter the 2-OHE2-induced GVBD, but high concentrations (5 and 10 micromol l(-1)) inhibited it. The incubation of the follicles with H89 lowered the inhibitory effect of IBMX on the 2-OHE2-induced GVBD. The incubation of the follicles with okadaic acid (OA), a protein phosphatase 1 and 2A inhibitor did not affect GVBD but when co-incubated with 2-OHE2, it enhanced the GVBD response. OA reversed the inhibitory effect of IBMX. The results suggest that OA may overcome the inhibition of 2-OHE2-induced GVBD by IBMX at a step distal to the cAMP-PKA pathway." @default.
• W2105611070 created "2016-06-24" @default.
• W2105611070 creator A5001020526 @default.
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• W2105611070 date "2006-07-01" @default.
• W2105611070 modified "2023-10-03" @default.
• W2105611070 title "2-hydroxyestradiol-17β-induced oocyte maturation: involvement of cAMP–protein kinase A and okadaic acid-sensitive protein phosphatases,and their interplay in oocyte maturation in the catfishHeteropneustes fossilis" @default.
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• W2105611070 doi "https://doi.org/10.1242/jeb.02270" @default.
• W2105611070 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16788039" @default.
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