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- W2059665140 abstract "A study was conducted to develop an in vitro culture system for growing sheep oocytes from isolated primordial follicles. Enzymatically isolated neonatal sheep primordial follicles were cultured in Waymouth MB752/1 medium containing BSA (3 mg/ml) + ITS (1%, v/v) over 28 days. In Experiment 1, primordial follicles (average diameter 40.2 ± 0.60 μm) were cultured at densities of 20, 50 and 100 follicles per well. Less than 20% of the oocytes survived to day 28 but there was a significant (P < 0.05) increase in median oocyte diameter from day 2 to day 28 for oocytes cultured at the higher densities of 50 and 100 follicles. In Experiment 2, two methods to improve oocyte:granulosa cell associations were tested. Altering the fibronectin coating regime did not improve oocyte survival and growth. In contrast lectin-aggregated primordial follicles cultured on non-coated wells showed significantly (P < 0.05) improved oocyte survival to 50% and increased median oocyte diameter compared to non-aggregated follicles. In Experiment 3, the effect of KIT ligand (KL) at 0 ng/ml, 10 ng/ml and 100 ng/ml, on lectin-aggregated primordial follicles cultured on non-coated wells was tested. KL at 100 ng/ml significantly (P < 0.05) increased median oocyte diameter compared to non-treated controls but had no effect on oocyte survival. In addition, follicles cultured with 100 ng/ml KL expressed mRNA for AMH, a gene expressed only in granulosa cells of growing follicles. In conclusion, culture of lectin-aggregated primordial follicles supported the long-term survival and growth of oocytes from isolated sheep primordial follicles. Culture of lectin-aggregates with 100 ng/ml KL further increased oocyte growth and induced granulosa cell differentiation." @default.
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- W2059665140 date "2005-10-01" @default.
- W2059665140 modified "2023-09-29" @default.
- W2059665140 title "In vitro growth of oocytes from primordial follicles isolated from frozen–thawed lamb ovaries" @default.
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- W2059665140 doi "https://doi.org/10.1016/j.theriogenology.2005.02.010" @default.
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