1985 Volume 145 Issue 2 Pages 197-203
OHTSU, H., MUE, S., TAMURA, G., YAMAUCHI, K., ISHIHARA, T., SATO, K. and TAKISHIMA, T. Measurement of SRS-A Activities in Plasma of Asthmatic Patients. Tohoku J. exp. Med., 1985, 145 (2), 197-203-Ethanol extracts of arterial blood from 20 of 29 asthmatic patients during attacks produced sustained contractions of the guinea pig ileum. These contractions were inhibited by FPL 55712, a specific antagonist of slow reacting substance of anaphylaxis (SRS-A). SRS-A activity was significantly higher during attack than during remission. Reverse-phase high pressure liquid chromatography (HPLC) was performed on two extracts which had shown high SRS-A activity with bioassay. One extract showed double peaks, which had retention times identical to those of leukotriene (LT) C4 and LTD4. The other extract showed a single peak, which had a retention time identical to that of synthetic LTC4.
