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The Journal of Neuroscience, December 15, 1998, 18(24):10481-10492

Expression Pattern and Neurotrophic Role of the c-fms Proto-Oncogene M-CSF Receptor in Rodent Purkinje Cells

Shin-ichi Murase¹ and Yokichi Hayashi²

¹ Department of Anatomy, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan, and ² Department of Cell and Molecular Biology, Nagano College of Nursing, Akoho 1694, Komagane-shi, Nagano 399-4117, Japan

To investigate whether the c-fms proto-oncogene plays a role in the CNS, we examined its expression in mouse brain. We found that c-fms-positive Purkinje cells first appeared in caudal cerebellum at postnatal day 0 (P0) arranged in a parasagittal manner, and most Purkinje cells gradually became positive by P6. This differential expression was not seen from P7 to adulthood, and the parasagittal pattern until P5 was different from those of L7, zebrins, and the integrin 1 subunit. No neuronal expression of c-fms was found in the other brain regions examined. In both reeler and weaver mutant mice in the adult stage, all Purkinje cells were positive for c-fms as in the wild-type controls; however, the parasagittal bands of c-fms-positive Purkinje cells were observed even in the adult staggerer mutant. To check the neurotrophic effect of macrophage colony-stimulating factor (M-CSF), we immunostained cerebella derived from osteopetrotic mutant mice, that is, those devoid of active M-CSF. We found that the number of calbindin-positive Purkinje cells in a given cerebellum began to decrease substantially during the initial 4-5 weeks of the postnatal period. In addition, cultured Purkinje cells were dependent on M-CSF for their survival. These data suggest that expression of the c-fms gene is intrinsically programmed in the Purkinje cells and never affected by the afferent synaptic input and that neuronal survival of Purkinje cells is dependent on M-CSF after weaning. Therefore, c-fms is considered to be a new developmental marker for Purkinje cells.

Key words: granule cell; parallel fiber; neurotrophin; cytokine; microglia; integrin; zebrin; parasagittal band; CSF-1; retinoic acid receptor-related orphan nuclear receptor

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Copyright © 1998 Society for Neuroscience  0270-6474/98/182410481-12$05.00/0

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