General description： Phosphatidic acid is obtained from glycerophospholipid with the help of phospholipase D. 08:0 PA/1,2-dioctanoyl-sn-glycero-3-phosphate (C8-PA) is an mammalian target of rapamycin (mTOR) activator. Application： 08:0 PA may be used to activate p-mTOR in order to assess whether the observed apoptotic effect of histone deacetylase inhibitors (HDACIs) is related to mammalian target of rapamycin (mTOR) pathway signaling.