Increased MAP1B expression without increased phosphorylation in manganese-treated PC12Mn cells

Regulation of MAP1B expression and phosphorylation is thought to play an important role in neuronal development, particularly with regard to axon growth. The present work utilizes a novel PC12 cell variant [26] which exhibits many of the early morphological features of neurite outgrowth when stimulated with manganese chloride. Expression of MAP1B was determined by immunoblots and phosphorylation was assessed by metabolic radiolabeling with [32P]orthophosphate or with a phospho-specific antibody. The results indicate that MAP1B protein levels rise within 12 to 24 h, but there is no significant change in the phosphorylation of MAP1B. The latter conclusion is based on (i) experiments utilizing SMI 31, a monoclonal antibody that specifically reacts with phospho-MAP1B and (ii) assessments of both MAP1B phosphorylation and MAP1B protein within that same isloated protein band on Western blots. Thus, manganese increases MAP1B expression without affecting its relative phosphorylation. Although manganese does not cause neurite formation in the parental PC12 cell line, manganese is capable of inducing transient neurite regeneration from NGF-primed cells. These studies provide further evidence that the onset of neurite outgrowth may proceed without increased phosphorylation of MAP1B. During sustained neurite regeneration, however, NGF increases phosphate incorporation into MAP1B. Based on all of these findings, we conclude that early phases of neurite outgrowth (cell spreading and formation of short tapered extensions) do not necessarily require elevated phosphorylation of MAP1B.