Neurite outgrowth from N18TG2 neuroblastoma induced by H-7, a protein kinase inhibitor, in the presence of colchicine

Brain Research Bulletin
K OnoM Tsuda

Abstract

Our previous studies have demonstrated that the protein kinase inhibitor H-7 promotes neurite outgrowth from mouse neuroblastoma N18TG2 cells as well as from primary cerebellar cells, and also that the neurites induced by H-7 were more tolerant of colchicine (COL) than those induced by dibutyryl cAMP (dB-cAMP). In the present study, we tested the effects of H-7 and dB-cAMP on neurite growth from N18TG2 cells in the presence of COL. We found that only H-7 promoted neurite formation in the presence of COL. The percentage of cells with neurites induced by H-7 in the presence of COL (H-7 + COL) was similar to that induced by H-7 alone. The neurites induced by H-7 + COL grew straight. They were very thin (less than 1 micron in diameter) and had round varicosities, as did the neurites induced by H-7 alone. By transmission electron microscopy, the neurites induced by H-7 + COL were found to contain longitudinally arranged intermediate filaments (IF). Microtubules (MT) were not observed within the neurites. We also examined the effect of cytochalasin B (CB) on the neurites induced by H-7 + COL and by H-7 alone. The neurites induced by H-7 + COL were tolerant to CB, but those induced by H-7 were resorbed completely within 24 h after CB ...Continue Reading

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