Abstract
Steady-state mRNA levels for NGF, BDNF, and NT-3, and their receptors, LNGFR, trk, trkB, and trkC, were examined in cultured rat Schwann cells. NGF, BDNF, and LNGFR mRNAs were expressed in control Schwann cells, but NT-3, trk, trkB and trkC mRNAs were not. As previously reported, when Schwann cells were treated with forskolin or 8-bromo-cAMP, NGF mRNA expression was enhanced, while BDNF and LNGFR mRNA levels were suppressed. The optimal concentration of forskolin for NGF mRNA enhancement and BDNF mRNA suppression was similar to that for LNGFR mRNA suppression, which coincided with the optimal concentration for Schwann cells to differentiate. However, the lag-time for forskolin-induces down-regulation of LNGFR mRNA was far greater than that for NGF mRNA increase and BDNF mRNA suppression.
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