摘要: Substance P (SP) was first described in 1931 by von Euler and Gaddum. They reported that extracts of the equine brain intestine contained a substance caused contractions intestinal preparations lowered blood pressure. Early findings suggested SP peptide nature. However, it not until 1971 amino acid sequence undecapeptide determined (Chang Leeman, 1971). Today or SP-like peptides are known to have wide distribution nervous system both vertebrates invertebrates.