Abstract：
:Treatment of adult rats with a single dose of nerve growth factor (NGF, 1 mg/kg, i.p.) results in a prolonged hypersensitivity to noxious thermal stimulation which becomes noticeable within 30 min of administration and lasts for several days. A significant mechanical hyperalgesia develops within 7 h following injection of NGF and persists for up to 7 days. In the present set of experiments we describe certain quantitative features of this hyperalgesia. The initial thermal hyperalgesia can be highly variable and is associated to some degree with the presence of an overt immunologic reaction. The mechanical hyperalgesia is reproducible enough to reveal a clear dependency on the dose of NGF. We also examined the pharmacological properties of the NGF-induced hyperalgesia. The bradykinin BK1 receptor antagonist des-Arg9[Leu8]BK transiently blocked the thermal hyperalgesia when injected 1 day after NGF administration whereas mechanical thresholds were further reduced under this protocol. The BK2 antagonist HOE 140 had no effect on this late NGF-induced hyperalgesia. Injection of the neurokinin NK1 receptor antagonist CP-96345 or its inactive enantiomer CP-96344 one day after NGF both induced a transient block of NGF-induced thermal hyperalgesia indicating a non-specific effect rather than an action at NK1 receptors. This was confirmed by finding no reversal of NGF-induced hyperalgesia by RP67580, another NK1 receptor blocker. These results suggest upregulation and activation of BK1 but not NK1 receptors as an additional, probably peripheral, mechanism for the late phase of NGF-induced thermal hyperalgesia.
journal_name
Painjournal_title
Painauthors
Rueff A,Dawson AJ,Mendell LMdoi
10.1016/0304-3959(96)03060-6subject
Has Abstractpub_date
1996-08-01 00:00:00pages
359-72issue
2-3eissn
0304-3959issn
1872-6623pii
0304-3959(96)03060-6journal_volume
66pub_type
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