Localization and activation of substance P receptors in unmyelinated axons of rat glabrous skin - PubMed (original) (raw)
. 1996 Sep 23;734(1-2):103-8.
Affiliations
- PMID: 8896815
Localization and activation of substance P receptors in unmyelinated axons of rat glabrous skin
S M Carlton et al. Brain Res. 1996.
Abstract
Immunohistochemical staining for the substance P (neurokinin INK1) receptor labels 32% of the unmyelinated axons in the glabrous skin of the rat hindpaw. This is the first demonstration of substance P (SP) receptors associated with the membranes of primary afferent fibers. Injection of SP into the subcutaneous tissue of the third hind toe results in behavioral changes interpreted as mechanical hyperalgesia and mechanical allodynia. These nocifensive behaviors can be blocked by the NK1 antagonist CP99,994-1. The presence of peripheral axons immunolabelled for NK1 receptors and the demonstration that exogenous peripheral SP causes nocifensive behaviors would seem to indicate that SP can have a direct effect on sensory afferents with activation of these receptors resulting in fine afferent firing and thus the pain-related behaviors. Additionally, the presence of round, clear vesicles in some of the SP receptor-labelled axons suggests the presence of autoreceptors since it is known that many primary sensory afferents contain SP.
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