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Sensory neuropeptides contribute to oedema formation in experimental burns.

The role of primary sensory neuropeptides in experimental burns was investigated. It was shown that after scalding, substance P-like immunoreactivity is released into the lymphatic fluid of dogs. Substance P, injected intravenously, was shown to cause dose-dependent oedema formation in rat skin, as measured with the Evans blue-technique. Furthermore, capsaicin pretreatment, which depletes the neuropeptide content of primary sensory neurons, was shown to inhibit late oedema formation in rats.