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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Algesia and local responses induced by neurokinin A and substance P in human skin and temporal muscle.

Neurokinin A (NKA), substance P ( SP) and the two peptides combined ( SP + NKA) were injected intracutaneously on the forearm and into the temporal muscle of healthy volunteers. Pain intensity, cutaneous wheal and flare responses and tenderness of the temporal muscle were quantitated. SP but not NKA induced cutaneous pain. This relates the algesic effect of SP to the specific N-terminal amino acid sequence of the peptide, not shared by NKA. NKA, however, potentiated the algesic effect of SP as SP + NKA induced a significantly prolonged cutaneous pain sensation. Both peptides induced wheals, but only SP induced flare. These results confirm previous studies relating wheal formation to the identical C-terminal amino acid sequence of the two peptides and flare reaction to the N-terminal part of SP. Injections into the temporal muscle did not cause pain or tenderness.[1]

References

  1. Algesia and local responses induced by neurokinin A and substance P in human skin and temporal muscle. Pedersen-Bjergaard, U., Nielsen, L.B., Jensen, K., Edvinsson, L., Jansen, I., Olesen, J. Peptides (1989) [Pubmed]
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