Summary
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1.
Kassinin, a tachykinin dodecapeptide isolated from the skin of the African frog Kassina senegalensis was submitted to parallel bioassay with physalaemin, eledoisin and substance P, three major representatives of the tachykinin peptide family. Bioassay was carried out on blood pressure, salivary secretion and isolated or in situ smooth muscle preparations.
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2.
As expected, kassinin possessed the entire spectrum of biological activity peculiar to the tachykinins. However, among the examined tachykinins kassinin was the poorest stimulant of salivary secretion and the weakest hypotensive agent, while displaying very powerful stimulant effects on different smooth muscle preparations, especially on isolated preparations of urinary bladder.
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3.
Kassinin differed from the other tachykinins also for its more gradual and sustained action on several in situ and isolated preparations. The peptide most similar to kassinin in its spectrum of activity was eledoisin.
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4.
Emphasis is laid on the possibility to dissociate the effects of the tachykinins on different target systems through changes in the N-moiety of the tachykinin molecule.
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References
Anastasi, A., Montecucchi, P., Erspamer, V., Visser, K.: Amino acid composition and sequence of kassinin, a tachykinin dodecapeptide from the skin of the African frog Kassina senegalensis. Experientia 33, 857–858 (1977)
Erspamer, V., Negri, L., Falconieri Erspamer, G., Endean, R.: Uperolein and other active peptides in the skin of the Australian leptodactylid frogs Uperoleia and Taudactylus. Naunyn-Schmiedeberg's Arch. Pharmacol. 289, 41–54 (1975)
Erspamer, V., Falconieri Erspamer, G., Linari, G.: Occurrence of tachykinins (physalaemin- or substance P-like peptides) in the amphibian skin and their actions on smooth muscle preparations. In: Substance P (U.S. von Euler and B. Pernow, eds.), pp. 67–74. New York: Raven Press 1977
Falconieri Erspamer, G., Negri, L., Piccinelli, D.: The use of preparations of urinary bladder smooth muscle for bioassay and discrimination between polypeptides. Naunyn-Schmiedeberg's Arch. Pharmacol. 279, 61–74 (1973)
Yaijma, H., Sasaki, T., Ogawa, H., Fujii, N., Segawa, T., Nakata, Y.: Studies on peptides LXXVI. Synthesis of kassinin, a new frog skin peptide. Chem. Pharm. Bull. 26, 1231–1235 (1978)
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Falconieri Erspamer, G., Erspamer, V. & Piccinelli, D. Parallel bioassay of physalaemin and kassinin, a tachykinin dodecapeptide from the skin of the African frog Kassina senegalensis . Naunyn-Schmiedeberg's Arch. Pharmacol. 311, 61–65 (1980). https://doi.org/10.1007/BF00500303
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DOI: https://doi.org/10.1007/BF00500303