Abstract:
:In this immunocytochemical study we investigated the distribution of nervous structures in the lower lip of adult rats. The region is characterized by a rich cutaneous and mucosal sensory innervation originating from terminal branches of the trigeminal system. Lower lip innervation was investigated by detection of the general neuronal marker protein gene product 9.5 (PGP 9.5) and the growth-associated protein 43 (GAP-43), a neurochemical marker of neuronal plasticity. The entire neural network of both cutaneous and mucosal aspects was stained by the antibody to PGP 9.5. In particular, nerve fibers were observed in the submucosal and the subepithelial plexuses. Thin immunoreactive fibers were observed within the epithelial layers ending as free fibers or as fibers associated with immunopositive Merkel cells. Well-identified anatomical structures receiving sensory or autonomic innervation were also surrounded by PGP 9.5-ir nerve fibers, in particular, hair follicles, vibrissae, glands, and blood vessels. GAP-43-immunostained nerve fibers were observed in all these structures; however, they were generally less numerous than the PGP 9.5-immunoreactive elements. An equal amount of PGP 9.5 and GAP-43 immunoreactivity occurred, in contrast, in the subepidermal and the submucosal plexuses, or in the epidermis and the mucosal epithelium. The present results show that GAP-43 is normally expressed in the mature trigeminal sensory system of the rat. Skin and oral mucosa are characterized by continuous remodeling that may also involve the sensory nervous apparatus. Continuous neural remodeling, regeneration and sprouting may be the reason for the observed expression of GAP-43.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Verzé L,Paraninfo A,Ramieri G,Viglietti-Panzica C,Panzica GCdoi
10.1007/s004410051348keywords:
subject
Has Abstractpub_date
1999-08-01 00:00:00pages
203-11issue
2eissn
0302-766Xissn
1432-0878journal_volume
297pub_type
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