TNF and infarction: To research the effects of Panax notoginseng saponins (PNS) on angiotensin-converting enzymes 2 (ACE2) and tumor necrosis factor-alpha (TNF-alpha) in rats with postmyocardial infarction ventricular remodeling, it was concluded that PNS can stimulate ACE2 to inhibit the expression of TNF-alpha and enhance the antioxidants.