Abstract
In the present study, we observed the effects of cyclosporine A (CsA), an efficient immunosuppressant, on cell proliferation and neuroblast differentiation in the subgranular zone of the dentate gyrus (SZDG) in normal C57BL/6 mice using Ki67 and doublecortin (DCX) immunohistochemical staining, respectively. At 8 weeks of age, vehicle (physiological saline) or CsA was daily administered (40 mg/kg, i.p.) for 1 week. Animals were sacrificed at 2 weeks after last administration. CsA treatment did not show any influences in neurons, astrocytes and microglia based on immunohistochemistry for its markers, respectively. However, in the CsA-treated group, Fluoro-Jade B, a marker for neurodegeneration, positive cells were found in the SZDG, not in the vehicle-treated group. In the vehicle-treated group, Ki67 immunoreactive (+) nuclei were clustered in the SZDG, whereas in the CsA-treated group Ki67+ nuclei were scattered in the SZDG, showing no difference in cell numbers. Numbers of DCX+ neuroblasts with well-developed processes (tertiary dendrites) were much lower in the CsA-treated group than those in the vehicle-treated group; however, numbers of DCX+ neuroblasts with secondary dendrites were similar in both the groups. These results suggest that CsA significantly reduces dendritic outgrowth and complexity from neuroblasts in the SZDG without any affecting in neurons, astrocytes and microglia in normal mice.
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Acknowledgments
The authors would like to thank Mr. Seung Uk Lee and Mrs. Hyun Sook Kim for their technical help in this study. This work was supported by the stem cell research program of Ministry of Science & Technology, grants (M10641450002-07N4145-00210), and by a grant (20090K001290) from Brain Research Center of the twenty-first Century Frontier Research Program funded by the Ministry of Education, Science and Technology, the Republic of Korea.
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Hwang, I.K., Yi, S.S., Shin, J.H. et al. Cyclosporine A Reduces Dendritic Outgrowth of Neuroblasts in the Subgranular Zone of the Dentate Gyrus in C57BL/6 Mice. Neurochem Res 35, 465–472 (2010). https://doi.org/10.1007/s11064-009-0082-x
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DOI: https://doi.org/10.1007/s11064-009-0082-x