Abstract：
:The cloned vanilloid receptor-1 (VR1) is recognized as a common molecular target for protons, noxious heat, and vanilloids. The presence of VR1 in the dorsal root, trigeminal, and nodose ganglia has been firmly established, but it is unclear in the gut, despite this VR1 may be important for gastric mucosal homeostasis. In this study we used an antibody and a radioligand to show the distribution of vanilloid receptors (VRs) in rat stomach and to characterize it. The deafferentiation of capsaicin-sensitive nerves in rats was induced by consecutive injections of capsaicin. VR1-immunopositive nerve endings were predominantly found in the mucous neck cells of the proliferation zone, and around blood vessels in the submucosa. Radioreceptor assay using [3H]-resiniferatoxin (RTX) revealed the existence of high affinity and single-class binding site in the membrane fractions of the mucosa. Capsaicin completely inhibited the specific binding of [3H]-RTX. Both the VR1 immunoreactivity and the receptor density of [3H]-RTX binding sites significantly reduced by the application of capsaicin for prolonged periods of time in the mucosa of rats. Our results indicate that VRs are expressed in the rat stomach, and suggest that they may be involved in mucosal protection by increasing cell proliferation and blood flow.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Nozawa Y,Nishihara K,Yamamoto A,Nakano M,Ajioka H,Matsuura Ndoi
10.1016/s0304-3940(01)02021-3keywords:
subject
Has Abstractpub_date
2001-08-17 00:00:00pages
33-6issue
1eissn
0304-3940issn
1872-7972pii
S0304-3940(01)02021-3journal_volume
309pub_type
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