Neural differentiation promoted by truncated trkC receptors in collaboration with p75(NTR) - PubMed (original) (raw)
. 1998 Sep 1;201(1):90-100.
doi: 10.1006/dbio.1998.8970.
Affiliations
- PMID: 9733576
- DOI: 10.1006/dbio.1998.8970
Free article
Neural differentiation promoted by truncated trkC receptors in collaboration with p75(NTR)
S J Hapner et al. Dev Biol. 1998.
Free article
Abstract
trkC receptors, which serve critical functions during the development of the nervous system, are alternatively spliced to yield isoforms containing the catalytic tyrosine kinase domain (TK+) and truncated isoforms which lack this domain (TK-). To test for potential differences in their roles during early stages of neural development, TK+ and TK- isoforms were ectopically expressed in cultures of neural crest, the stem cell population that gives rise to the vast majority of the peripheral nervous system. NT-3 activation of ectopically expressed trkC TK+ receptors promoted both proliferation of neural crest cells and neuronal differentiation. Strikingly, the trkC TK- isoform was significantly more effective at promoting neuronal differentiation, but had no effect on proliferation. Furthermore, the trkC TK- response was dependent on a conserved receptor cytoplasmic domain and required the participation of the p75(NTR) neurotrophin receptor. Antibody-mediated receptor dimerization of TK+ receptors, but not TK- receptors, was sufficient to stimulate differentiation. These data identify a phenotypic response to activation of the trkC TK- receptor and demonstrate a functional interaction with p75(NTR), indicating there may be multiple trkC receptor-mediated systems guiding neuronal differentiation.
Copyright 1998 Academic Press.
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