Parasympathetic nerve fibers invade the upper dermis following sensory denervation of the rat lower lip skin
Identifieur interne : 000D55 ( Istex/Checkpoint ); précédent : 000D54; suivant : 000D56Parasympathetic nerve fibers invade the upper dermis following sensory denervation of the rat lower lip skin
Auteurs : Michele Ramien [Canada] ; Isabella Ruocco ; A. Claudio Cuello [Canada] ; Manon St-Louis [Canada] ; Alfredo Ribeiro-Da-Silva [Canada]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 2004-01-26.
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Abstract
The sympathetic division of the autonomic nervous system is known to play a role in the genesis of neuropathic pain. In the skin of the rat lower lip (hairy skin), sympathetic and parasympathetic fibers normally innervate the same blood vessels in the lower dermis but do not occur in the upper dermis. However, we have shown that sympathetic fiber migration into the upper dermis occurs following mental nerve lesions (Ruocco et al. [2000] J. Comp. Neurol. 422:287–296). As sensory denervation has a dramatic effect on sympathetic fiber innervation patterns in the rat lower lip skin, we decided to investigate the possible changes in the other autonomic fiber type in the skin—the parasympathetic fiber. Sensory denervation of the rat lower lip was achieved by bilateral transection of the mental nerve, and animals were allowed to recover for 1–8 weeks. Lower lip tissue was processed for double‐labeling light microscopic immunocytochemistry (ICC), using antibodies against substance P (SP), which labels a subpopulation of peptidergic sensory fibers, and against the vesicular acetycholine transporter (VAChT), as a marker for parasympathetic fibers. In sham‐operated rats, SP‐immunoreactive (IR) sensory fibers were found in the epidermis and upper and lower dermal regions, whereas VAChT‐IR fibers were confined to the lower dermis. Mental nerve lesions induced the gradual disappearance of SP‐IR fibers from all skin layers accompanied by the progressive migration of VAChT‐IR fibers into the upper dermis. Cholinergic fiber migration was evident by the second week post surgery, and the ectopic innervation of the upper dermis by these fibers persisted even at the last time point studied (8 weeks) when SP‐IR fibers have completely regrown. VAChT‐IR fibers were observed in the upper dermis, well above the opening of the sebaceous glands into the hair follicles. These results show that considerable changes occur in the innervation patterns of parasympathetic fibers following mental nerve lesions. J. Comp. Neurol. 469:83–95, 2004. © 2003 Wiley‐Liss, Inc.
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DOI: 10.1002/cne.10998
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<front><div type="abstract" xml:lang="fr">The sympathetic division of the autonomic nervous system is known to play a role in the genesis of neuropathic pain. In the skin of the rat lower lip (hairy skin), sympathetic and parasympathetic fibers normally innervate the same blood vessels in the lower dermis but do not occur in the upper dermis. However, we have shown that sympathetic fiber migration into the upper dermis occurs following mental nerve lesions (Ruocco et al. [2000] J. Comp. Neurol. 422:287–296). As sensory denervation has a dramatic effect on sympathetic fiber innervation patterns in the rat lower lip skin, we decided to investigate the possible changes in the other autonomic fiber type in the skin—the parasympathetic fiber. Sensory denervation of the rat lower lip was achieved by bilateral transection of the mental nerve, and animals were allowed to recover for 1–8 weeks. Lower lip tissue was processed for double‐labeling light microscopic immunocytochemistry (ICC), using antibodies against substance P (SP), which labels a subpopulation of peptidergic sensory fibers, and against the vesicular acetycholine transporter (VAChT), as a marker for parasympathetic fibers. In sham‐operated rats, SP‐immunoreactive (IR) sensory fibers were found in the epidermis and upper and lower dermal regions, whereas VAChT‐IR fibers were confined to the lower dermis. Mental nerve lesions induced the gradual disappearance of SP‐IR fibers from all skin layers accompanied by the progressive migration of VAChT‐IR fibers into the upper dermis. Cholinergic fiber migration was evident by the second week post surgery, and the ectopic innervation of the upper dermis by these fibers persisted even at the last time point studied (8 weeks) when SP‐IR fibers have completely regrown. VAChT‐IR fibers were observed in the upper dermis, well above the opening of the sebaceous glands into the hair follicles. These results show that considerable changes occur in the innervation patterns of parasympathetic fibers following mental nerve lesions. J. Comp. Neurol. 469:83–95, 2004. © 2003 Wiley‐Liss, Inc.</div>
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