2.6. Granulosa cell collection and hypoxia treatment Ovaries were repeatedly washed with PBS and ethanol (70%).Granulosa cells were aseptically harvested by aspiration of large follicles (>5 mm) with a 26-gauge needle, released in medium containing heparin (50 IU/ml), centrifuged for pelleting and then treated with 0.9% prewarmed ammonium chloride at 37 °C for 1 min to
remove red blood cells. Cell number and viability were estimated using a haemocytometer under a phase contrast microscope after vital staining with trypan blue (0.4%) of an aliquot of the cell suspension. Cells were seeded in DMEM/Ham’s F12 supplemented with sodium bicarbonate (2.2 mg/ml), bovine serum albumin (BSA 0.1%), penicillin (100 IU/ml), streptomycin (100 lg/ml),
amphotericin B (2.5 lg/ml), selenium (5 ng/ml) and transferrin(5 lg/ml). Once seeded in 24-well plates (106/ml), cells were incu-bated at 37 °C under humidified atmosphere (5% CO2) for 24 h andthen subjected for 18 h to normoxia (19% O2), hypoxia (5% O2) anoxia (1% O2). Anoxia was achieved employing an AnaerocultÒ Amini while hypoxia was obtained by means of an AnaerocultÒ C
mini (Merck KgaA, Darmstadt, Germany). In both cases the system
consisted of plastic pouches and a paper gas generating sachet
(Basini et al., 2004)
freezed until STC 1 assay
2.6. Granulosa cell collection and hypoxia treatment Ovaries were repeatedly washed with PBS and ethanol (70%).Granulosa cells were aseptically harvested by aspiration of large follicles (>5 mm) with a 26-gauge needle, released in medium containing heparin (50 IU/ml), centrifuged for pelleting and then treated with 0.9% prewarmed ammonium chloride at 37 °C for 1 min toremove red blood cells. Cell number and viability were estimated using a haemocytometer under a phase contrast microscope after vital staining with trypan blue (0.4%) of an aliquot of the cell suspension. Cells were seeded in DMEM/Ham’s F12 supplemented with sodium bicarbonate (2.2 mg/ml), bovine serum albumin (BSA 0.1%), penicillin (100 IU/ml), streptomycin (100 lg/ml),amphotericin B (2.5 lg/ml), selenium (5 ng/ml) and transferrin(5 lg/ml). Once seeded in 24-well plates (106/ml), cells were incu-bated at 37 °C under humidified atmosphere (5% CO2) for 24 h andthen subjected for 18 h to normoxia (19% O2), hypoxia (5% O2) anoxia (1% O2). Anoxia was achieved employing an AnaerocultÒ Amini while hypoxia was obtained by means of an AnaerocultÒ Cmini (Merck KgaA, Darmstadt, Germany). In both cases the systemconsisted of plastic pouches and a paper gas generating sachet(Basini et al., 2004) freezed until STC 1 assay
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