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Successful spermatogonial transplantation requires depletion of the host germ cells to allow efficient colonization of the donor spermatogonial stem cells. Although a sterilizing drug, busulfan (Myleran), is commonly used for preparing a recipient mouse before transplantation, the optimal dose of this drug has not yet been defined. The present study investigated the effects of different doses of busulfan (10-50 mg per kg body weight) on survival rate, testicular mass and histomorphology, and on the haploid spermatids and spermatozoa of male BALB/c mice. The results suggest that a dosage of 30 mg kg(-1) is optimal for the ablative treatment with busulfan used to prepare the recipient mice. This dose results in an adequate depletion of the host germ cells for colonization of donor-derived spermatogonial stem cells and causes the lowest death rate of the animals.

Optimal dose of busulfan for depleting testicular germ cells of recipient mice before spermatogonial transplantation