Failure of gonadotropins to induce in vitro maturation of mouse oocytes treated with dibutyryl cyclic AMP
| Autor: | Mary V. Nekola, Dianne Moore Smith |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
endocrine system
medicine.medical_specialty Biology In Vitro Techniques Follicle Follicle-stimulating hormone Mice Meiosis Internal medicine medicine Animals Ovum Germinal vesicle dBc General Medicine Dibutyryl Cyclic AMP Luteinizing Hormone In vitro maturation Culture Media Endocrinology Bucladesine Oocytes Animal Science and Zoology Female Follicle Stimulating Hormone Luteinizing hormone hormones hormone substitutes and hormone antagonists |
| Zdroj: | The Journal of experimental zoology. 194(3) |
| ISSN: | 0022-104X |
| Popis: | In sufficient concentration, dibutyryl cAMP (DBC) prevents the spontaneous in vitro maturation of mouse oocytes. The effects of luteinizing hormone (LH) and follicle stimulating hormone (FSH) on this inhibition were tested in an oil-free chamber-slide culture system. Mouse oocytes devoid of cumulus cells were incubated in the presence of DBC and/or gonadotropins. Oocytes cultured with follicle cells were similarly treated. Whether follicle cells were present or absent, DBC (100 or 500 mug/ml) prevented germinal vesicle breakdown in more than 95% of the oocytes cultured. Neither LH nor FSH in a wide range of concentrations acted directly on the oocytes or indirectly through the follicle cells to initiate maturation in oocytes incubated with 100 mug DBC/ml. The combination of LH (5 mug/ml) and FSH (10 mug/ml) was also ineffective in overcoming the block induced by either 100 or 50 mug DBC/ml. Maturation of oocytes in each of the DBC-free LH or FSH treatments was comparable to that occurring in control medium which did not contain exogenous gonadotropins or DBC. It was concluded that cultured oocytes treated with DBC are not a satisfactory model for studying the steps by which gonadotropins trigger the resumption of meiosis in mammalian oocytes. |
| Databáze: | OpenAIRE |
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