title: Der f 2 activates phospholipase D in human T lymphocytes from Dermatophagoides farinae specific allergic individuals: involvement of protein kinase C-alpha.
abstract: The major house-dust mite allergen, Der f 2, stimulates the phospholipase D (PLD) in T lymphocytes from Dermatophagoides farinae specific allergic individuals. PLD activity increased more than two-fold in T cells from allergic patients compared with those cells from normal controls with maximal responses within 30 min after exposure of Der f 2. A well-known PLD activator PKC-alpha was found to be translocated to membrane from cytosol in Der f 2-treated T cells from Dermatophagoides farinae specific allergic individuals. Down-regulation of PKC-alpha with phorbol myristate acetate pretreatment for 24 h abolished Der f 2-induced PLD activation. Ro 320432, PKC inhibitor also reduced the effects of Der f 2-induced PLD activation suggesting that PKC-alpha acts as upstream activator of PLD in Der f 2-treated T cells. Taken together, the present data suggest that Der f 2 can stimulate PLD activity through the PKC-alpha activation in T cells from Dermatophagoides farinae allergic individuals.
authors.affiliation: Department of Pediatrics, Department of Biochemistry, College of Medicine, Hanyang University, Seoul 133-791, Korea. jshan@hanyang.ac.kr
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Oh
authors.forename: Eun-Young
authors.initials: EY
authors.lastname: Kim
authors.forename: Bon-Suk
authors.initials: BS
authors.lastname: Koo
authors.forename: Ha Baik
authors.initials: HB
authors.lastname: Lee
authors.forename: Ki Sung
authors.initials: KS
authors.lastname: Lee
authors.forename: Yong-Seok
authors.initials: YS
authors.lastname: Kim
authors.forename: Joong-Soo
authors.initials: JS
authors.lastname: Han
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D039741:Antigens, Dermatophagoides / Q000276:immunology*; D060829:Arthropod Proteins; D040001:Dermatophagoides farinae / Q000276:immunology*; D005260:Female; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000201:enzymology* / Q000276:immunology*; D008297:Male; D010739:Phospholipase D / Q000378:metabolism*; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000502:physiology*; D051571:Protein Kinase C-alpha; D012882:Skin Tests; D013601:T-Lymphocytes / Q000201:enzymology* / Q000276:immunology; D013755:Tetradecanoylphorbol Acetate / Q000031:analogs & derivatives* / Q000494:pharmacology; D015854:Up-Regulation
chemical_list: D039741:Antigens, Dermatophagoides; D060829:Arthropod Proteins; C451160:Dermatophagoides farinae antigen f 2; C016658:phorbolol myristate acetate; C496628:PRKCA protein, human; D011493:Protein Kinase C; D051571:Protein Kinase C-alpha; D010739:Phospholipase D; D013755:Tetradecanoylphorbol Acetate