National Taiwan University Department of HorticultureSheu, FuuFuuSheuChien, Po-JungPo-JungChienChien, Ai-LinAi-LinChienChen, Yin-FangYin-FangChenChin, Kah-LockKah-LockChin2006-11-142018-06-292006-11-142018-06-292004http://ntur.lib.ntu.edu.tw//handle/246246/2006111501275368A new immunomodulatory protein (APP) was purified from the fruiting body of an edible Jew’s Ear mushroom, Auricularia polytricha, by extraction using 5% cold acetic acid in the presence of 0.1% 2-mercaptoethanol, followed by ammonium sulfate fractionation, DE-52 and MonoQ anion-exchange chromatography. As determined by electrophoresis techniques, the molecular mass of APP is around 13.4 kDa and its pI is approximately 5.1. APP is a simple protein without carbohydrate, and can agglutinate mouse red blood cells. APP alone activates murine splenocytes, markedly increasing their proliferation and gamma-interferon (IFNc) secretion, and presents no cytotoxicity in vitro. Although murine splenocytes are stimulated by the mitogen concanavalin A (ConA), APP suppresses their proliferation in a dose-dependent manner. APP (5–20 lg/ml) also enhances the production of both nitric oxide (NO) and tumor necrosis factor-alpha (TNF-a) by LPS-induced RAW 264.7 macrophages. These findings suggest that APP is an immune stimulant and can strengthen the immune response of its host. 2004 Elsevier Ltd. All rights reserved.application/pdf253511 bytesapplication/pdfzh-TWspherical flocnonhomogeneous structuretwo-layer modelplatedrag forcejournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501275368/1/5093.pdf