Keisuke Tomochika, Akiko Shimizu-Ibuka, Tomoko Tamura, Kiyoshi Mura, Naoki Abe, Jun-Ichi Onose, Soichi Arai
Department of Nutritional Science, Faculty of Applied Bioscience, Tokyo University of Agriculture.
Bioscience, biotechnology, and biochemistry 2011Peanut skin contains large amounts of polyphenols having antiallergic effects. We found that a peanut-skin extract (PSE) inhibits the degranulation induced by antigen stimulation of rat basophilic leukemia (RBL-2H3) cells. A low-molecular-weight fraction from PSE, PSEL, also had inhibitory activity against allergic degranulation. A main polyphenol in PSEL was purified by gel chromatography and fractionated by YMC-gel ODS-AQ 120S50 column. Electrospray ionization mass spectrometry (ESI-MS) analysis of the purified polyphenol gave m/z 599 [M+Na]⁺. Based on the results of ¹H-NMR, ¹³C-NMR spectra, and optical rotation analysis, the polyphenol was identified as procyanidin A1. It inhibited the degranulation caused by antigen stimulation at the IC₅₀ of 20.3 µM. Phorbol-12-myristate-13-acetate (PMA) and 2,5,-di(tert-butyl)-1,4-hydroquinone (DTBHQ)-induced processes of degranulation were also inhibited by procyanidin A1. These results indicate that peanut-skin procyanidin A1 inhibits degranulation downstream of protein kinase C activation or Ca²⁺ influx from an internal store in RBL-2H3 cells.
Keisuke Tomochika, Akiko Shimizu-Ibuka, Tomoko Tamura, Kiyoshi Mura, Naoki Abe, Jun-Ichi Onose, Soichi Arai. Effects of peanut-skin procyanidin A1 on degranulation of RBL-2H3 cells. Bioscience, biotechnology, and biochemistry. 2011;75(9):1644-8
PMID: 21897038
View Full Text