The effects of the growth factor-antagonist, trapidil, on remyelination in the CNS.

Abstract:

:In this study we describe the effects of trapidil, a putative platelet-derived growth factor-antagonist, on spontaneously occurring remyelination in rat spinal cord. Demyelination was created in the dorsal funiculus of 6- and 11-week-old female rats by the direct injection of 1.0 microliter of 1% lysolecithin. The animals received daily intra-peritoneal injections of either trapidil or saline for 21 days, commencing on the day of lesion induction. The 11-week-old rats receiving trapidil (60 mg/kg) showed a significant decrease in the extent of oligodendrocyte remyelination. Moreover, those axons that were remyelinated by oligodendrocytes tended to have thinner myelin sheaths than axons remyelinated by oligodendrocytes in the control group. In the 6-week-old group, the dose of trapidil which inhibited oligodendrocyte remyelination in the 11-week-old animals had a minimal effect on the extent of oligodendrocyte remyelination and no effect on the quality of myelin sheath formation. A higher dose of trapidil (80 mg/kg) was required before significant impairment of oligodendrocyte remyelination was achieved in the younger age group, implying an age-dependent effect of growth factor-inhibition of CNS remyelination. These results indicate an important role for growth factors, and in particular PDGF, in the orchestration of oligodendrocyte remyelination in the rodent CNS.

authors

McKay JS,Blakemore WF,Franklin RJ

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

50-8

issue

1

eissn

0305-1846

issn

1365-2990

journal_volume

23

pub_type

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