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Effect of chronic capsaicin treatment on tachykinin NK1 binding sites in the rat


Geraghty, DP and Burcher, E, Effect of chronic capsaicin treatment on tachykinin NK1 binding sites in the rat, Peptides, 13, (2) pp. 409-411. ISSN 0196-9781 (1992) [Refereed Article]

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DOI: doi:10.1016/0196-9781(92)90129-Q


Binding sites for [125I]-Bolton-Hunter substance P (BHSP) were investigated in homogenates of rat submandibular gland, colon smooth muscle, and urinary bladder. In vehicle-treated animals, the equilibrium dissociation constant (KD) was similar for both submandibular gland (0.46 +/- 0.03 nM) and colon (0.57 +/- 0.04 nM), although the maximum density of binding sites (Bmax) was about six-fold higher in submandibular gland compared with colon. These binding parameters remained unchanged in capsaicin-pretreated animals (140 mg/kg IP). In contrast, capsaicin pretreatment reduced (p less than 0.05) the Bmax in urinary bladder by twenty-five percent (0.56 fmol/mg wet weight) when compared to vehicle-treated controls (0.73 fmol/mg wet weight), although the KD was unchanged (vehicle, 0.29 +/- 0.08 nM; capsaicin, 0.24 +/- 0.04 nM). These data demonstrate that the NK1 receptors in submandibular gland and colon smooth muscle are not associated with or dependent upon intact primary afferent sensory neurons. However, a minority of NK1 receptors in the urinary bladder were lost after capsaicin, indicating that these receptors are located on sensory terminals, or may be dependent on growth factors or other chemicals released from these nerves.

Item Details

Item Type:Refereed Article
Research Division:Biomedical and Clinical Sciences
Research Group:Pharmacology and pharmaceutical sciences
Research Field:Basic pharmacology
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Geraghty, DP (Professor Dominic Geraghty)
ID Code:69039
Year Published:1992
Web of Science® Times Cited:12
Deposited By:Health Sciences A
Deposited On:2011-04-15
Last Modified:2011-11-24

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