Sertoli cell lines 15P-1 and TM4 were purchased from Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences (http://www.crcpumc.com/). TM4 cells were cultured at 37 °C with 5% CO2 in DMEM/F12 containing 2.5% heat-inactivated fetal bovine serum (FBS) and 5% horse bovine serum (HBS). 15P-1 cells are derived from testicular cells of PyLT transgenic mice, and have properties of Sertoli cells. 15P-1 cells were maintained in DMEM with 10% heat-inactivated FBS and cultured at 32 °C with 5% CO2. Cells used in this study were purchased from ATCC. We tested the mycoplasma contamination by PCR during the culture processes and all the cells used here were mycoplasma free.
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