Abstract
Localization of mRNA encoding trkB indicates that two truncated isoforms of trkB, T1trkB and T2trkB, are differentially distributed in the rodent nervous system, and that each of these transcripts is co-expressed with catalytic trkB (TK+trkB) in adult motor neurons. In contrast to the prominent expression of T1trkB by non-neuronal cells, T2trkB expression appeared to be restricted to neurons and demonstrated significant overlap with the pattern of TK+trkB distribution. In developing spinal cord ventral horn, an age-related increase in hybridization was observed for truncated isoforms. These findings suggest that truncated trkB may modulate neuronal responses to neurotrophins which act via trkB.
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