Nitric oxide mediates distinct effects of various LPS chemotypes on phagocytosis and leukotriene synthesis in human neutrophils

作者：Zagryazhskaya Anna N; Lindner Sabine C; Grishina Zoryana V; Galkina Svetlana I; Steinhilber Dieter; Sud'ina Galina F^*

来源：International Journal of Biochemistry & Cell Biology, 2010, 42(6): 921-931.

DOI：10.1016/j.biocel.2010.01.025

• Lipopolysaccharide chemotypes
• Phagocytosis
• 5-Lipoxygenase
• Leukotriene
• Nitric oxide

We investigated the effect of lipopolysaccharide (LPS) chemotypes differing in their carbohydrate chain length on phagocytosis of serum-opsonized zymosan (OZ) particles and related functions of human polymorphonuclear leukocyte (PMNL, neutrophils) LPS from deep core mutant (Re). complete core (Ra) and smooth (S) phenotypes of Salmonella typhimurium was studied Priming of neutrophils with various LPSs caused prominent enhancement of OZ phagocytosis, superoxide production and leukotriene (LT) synthesis in neutrophils, with LPS effects increasing as Re <S < Ra The LPS forms were less potent to activate OZ uptake in the presence of MK-886, 5-lipoxygenase activating protein inhibitor, suggesting the regulatory function of 5-lipoxygenase (5-LO)-derived LTs Direct measurement of nitrite release from OZ-stimulated neutrophils revealed that the effects of LPS on NO synthesis increased in the range of Ra <S < Re Nitric oxide synthase (NOS) inhibitor L-NAME increased phagocytosis, LT and superoxide formation by neutrophils, and abolished the difference in the action of the LPSs forms Further mechanistic studies revealed that NO modulates cellular 5-LO activity in a guanylyl cyclase and protein kinase G dependent manner, as well as interplay between NO and superoxide. and peroxynitrite generation contribute to distinct effects of LPS chemotypes on phagocytosis and LT synthesis in human neutrophils Our investigation of the three LPS species demonstrates that the LPS polysaccharide core is mostly ess

• 出版日期2010-6