J Németh, G Oroszi, M Thán, Z S Helyes, E Pintér, B Farkas, J Szolcsányi
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Substance P radioimmunoassay for quantitative characterization of sensory neurotransmitter release.
In the present work we report the development of a new radioimmunoassay method for measuring the substance P content liberated from isolated rat tracheae in response to electrical or chemical (capsaicin, resiniferatoxin, piperine) stimulation. The amount of substance P released by electrical stimulation has been found to be dependent on the number of pulses and chemically elicited substance P release also proved to be dose-dependent. Our findings reinforce previous data that resiniferatoxin is approximately 100 times more potent than capsaicin and the potency ratio between piperine and capsaicin is 1/50.
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