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J Microsc Ultrastruct. 2018 Oct-Dec;6(4):197-204. doi: 10.4103/JMAU.JMAU_35_18.

Histological Study on the Protective Effect of Endogenous Stem Cell Mobilization in Busulfan-Induced Testicular Injury in Albino Rats.

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Department of Medical Histology and Cell Biology, Faculty of Medicine, Cairo University, Cairo, Egypt.



Testicular damage is one of the most hazardous effects of chemotherapy as it is frequently associated with oligozoospermia and azoospermia.

Aim of the Work:

This study aimed at evaluating the protective effect of hematopoietic stem cell mobilization by granulocyte colony-stimulating factor (G-CSF) in a rat model of busulfan-induced testicular injury.

Materials and Methods:

Twenty-four adult albino rats were divided into four groups: group I, the control, Group II: rats received two doses of busulfan (each 15 mg/kg) intraperitoneally (IP) with 14 days interval, Group III: rats received busulfan and left untreated, and Group IV received busulfan IP then G-CSF (70 μg/kg/day) subcutaneously for 5 consecutive days. Testicular sections were stained with H and E and immunohistochemically for CD34, proliferating cell nuclear antigen (PCNA) and caspase-3, and semithin sections were stained with toluidine blue.


Groups II and III showed loss of the normal histological architecture of the testis and spermatogenic cells, with increased apoptosis confirmed by significantly increased caspase-3 and significantly decreased PCNA immunoexpression. While Group IV revealed improved testicular histology, decreased apoptosis, and increased proliferative capacity of spermatogenic cells. This was confirmed by significantly decreased caspase-3 immunoexpression and increased PCNA immunoreaction.


Mobilization of stem cells with G-CSF was found to improve the testicular histology following busulfan chemotherapy in albino rats.


Busulfan; CD34; endogenous stem cells; granulocyte colony-stimulating factor; testis

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