title: Myristic Acid, A Side Chain of Phorbol Myristate Acetate (PMA), Can Activate Human Polymorphonuclear Leukocytes to Produce Oxygen Radicals More Potently than PMA.
abstract: Myristic acid (MyA), which is a saturated fatty acid (C14:0) and a side chain of phorbol 12-myristate 13-acetate (PMA), was examined if MyA stimulates human polymorphonuclear leukocytes (PMNs) to release oxygen radicals comparable to PMA by applying electron paramagnetic resonance (EPR)-spin-trapping method. When MyA was added to isolated human PMNs, spin adducts of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO)-OH and DMPO-OOH were time-dependently observed. The amounts of these spin adducts were larger than those of PMNs stimulated by PMA. These results clearly show that MyA is more potent agent to prime human PMNs than PMA, in a point of view of not only O(2) (.-) but also .OH production. This fact calls attention that too much intake of MyA that is known to be contained vegetable oils can lead to crippling effect through uncontrolled production of reactive oxygen species.
authors.affiliation: New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
authors.forename: Mika
authors.initials: M
authors.lastname: Tada
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Ichiishi
authors.forename: Rumiko
authors.initials: R
authors.lastname: Saito
authors.forename: Natsumi
authors.initials: N
authors.lastname: Emoto
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Niwano
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kohno