Anti-inflammatory, antinociceptive and anti-angiogenic activities of a phospholipid mixture purified from porcine lung tissues

Abstract

This work aimed to assess anti-inflammatory and related properties of a phospholipid mixture purified from porcine lung tissues, named KT&G101, which is being developed as a novel topical remedy for atopic dermatitis. KT&G101 consists of pure phospholipids, mainly phosphatidylcholine (PC) and other phospholipids such as phosphatidylinositol (PI) and phosphatidylserine (PS). Its predominant PC species is 1,2-dipalmitoylphosphatidylcholine (DPPC). KT&G101 exhibited an anti-angiogenic activity in the chick chorioallantoic membrane (CAM) assay. Oral administration of KT&G101 at the dosages of 100, 200 and 400 mg/kg body weight gave rise to an inhibition of 15.4%, 25.3% and 30.1% in the vascular permeability assay, respectively. In the carrageenan-induced inflammation in the air pouches, KT&G101 significantly diminished the volume of exudates in the pouches, the number of polymorphonuclear leukocytes and nitrite content in exudates. In the acetic acid-induced writhing response, oral administration of KT&G101 at the dosages of 50, 100 and 200 mg/kg body weight showed the reduction of 21.6%, 51.6% and 60.8% in the pain response of mice, respectively. It was also able to diminish the nitric oxide (NO) and reactive oxygen species (ROS) levels in the lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells. KT&G101 displayed a significant suppression on the induction of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in the stimulated RAW264.7 cells. However, the free radical scavenging activity of KT&G101 was detected to be very weak in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. Taken together, KT&G101 possesses anti-inflammatory and related antinociceptive and anti-angiogenic activities, which indirectly supports its use as an anti-atopic therapy.