Abstract
The genetic mechanisms that a target uses to reestablish the connections of regenerating axons were explored using oligonucleotide microarrays and real-time PCR. In normal and denervated mouse vibrissa follicles, patterns of genetic regulation were assessed in adjacent targets that normally receive different types of sensory and autonomic innervation. We show that a target remodeling occurs following axotomy involving reduced hair growth, altered hair follicle integrity and remodeling of the extracellular matrix. Also, we found two orphan receptors putatively involved in hair growth. Our data further demonstrate region-specific regulation of genes putatively involved in target-axon interactions. Thus, this study shows for the first time that major target remodeling occurs following denervation and suggests putative functions for several novel genes.
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