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- W1999465516 abstract "Substance P (SP) N-terminal fragments are known to alter nociception when injected intrathecally or when released in response to capsaicin. However, it is not known whether a sufficient concentration of SP N-terminal metabolites accumulate during noxious stimulation to modulate nociception. To test this, we examined the effect of the SP(1–7) antagonist, d-SP(1–7), injected intrathecally in mice, on two nociceptive assays that are differentially affected by exogenous SP(1–7): acetic acid-induced writhing that is inhibited and formalin-induced behaviors that are enhanced by SP(1–7). One nmol of d-SP(1–7) is sufficient to block the acute (30 min) antinociceptive effects of SP(1–7) on writhing. When injected alone at much higher doses (10–100 nmol), d-SP(1–7) inhibited writhing. In the formalin assay, SP(1–7) had no acute effect (30 min) on responses during Phase 1 at any dose tested, but d-SP(1–7) increased responses 5 min after injection of low (2–1000 pmol), but not high doses (10 and 100 nmol). Twenty-four hours after injection of SP(1–7), writhing was inhibited and formalin responses were increased. d-SP(1–7) prevented these effects of SP(1–7) but had no effect when injected alone, indicating that there is no tonic SP N-terminal activity in mice not exposed to noxious stimuli. Thus, acetic acid and formalin each induce endogenous SP N-terminal activity, respectively, producing a pro-nociceptive effect that is relatively insensitive to d-SP(1–7) and antinociception that is very sensitive to inhibition by d-SP(1–7)." @default.
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- W1999465516 date "1998-01-01" @default.
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- W1999465516 title "An antagonist of substance P N-terminal fragments, d-substance P(1–7), reveals that both nociceptive and antinociceptive effects are induced by substance P N-terminal activity during noxious chemical stimulation" @default.
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- W1999465516 doi "https://doi.org/10.1016/s0006-8993(97)01146-3" @default.
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