Cytokines, nerve growth factor and inflammatory hyperalgesia: the contribution of tumour necrosis factor alpha

British Journal of Pharmacology
Clifford J WoolfStephen Poole

Abstract

1. Peripheral inflammation is characterized by heightened pain sensitivity. This hyperalgesia is the consequence of the release of inflammatory mediators, cytokines and growth factors. A key participant is the induction of the neurotrophin nerve growth factor (NGF) by interleukin-1 beta (IL-1 beta). 2. Tumour necrosis factor alpha (TNF alpha) has been shown both to produce hyperalgesia and to upregulate IL-1 beta. We have now examined whether the induction of TNF alpha in inflammatory lesions contributes to inflammatory sensory hypersensitivity by inducing IL-1 beta and NGF. 3. The intraplantar injection of complete Freund's adjuvant (CFA) in adult rats produced a localized inflammation of the hindpaw with a rapid (3 h) reduction in withdrawal time in the hot plate test and in the mechanical threshold for eliciting the flexion withdrawal reflex. 4. The CFA-induced inflammation resulted in significant elevation in the levels of TNF alpha, IL-1 beta and NGF in the inflamed paw. In the case of TNF alpha, an elevation was detected at 3 h, rose substantially at 6 h, peaked at 24 h and remained elevated at 5 days, with similar but smaller changes in the contralateral non-inflamed hindpaw. No increase in serum TNF alpha was detected a...Continue Reading

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