Arginase I is constitutively expressed in human granulocytes and participates in fungicidal activity

作者：Markus Munder · 发表于：Blood · 年份：2004 · DOI：10.1182/blood-2004-07-2521 · 被引用次数：336 · 研究领域：Nitric Oxide and Endothelin Effects、Neutrophil, Myeloperoxidase and Oxidative Mechanisms、Antibiotics Pharmacokinetics and Efficacy

The balance of arginine metabolism via nitric oxide synthase (NOS) or arginase is an important determinant of the inflammatory response of murine macrophages and dendritic cells. Here we analyzed the expression of the isoform arginase I in human myeloid cells. Using healthy donors and patients with arginase I deficiency, we found that in human leukocytes arginase I is constitutively expressed only in granulocytes and is not modulated by a variety of proinflammatory and anti-inflammatory stimuli in vitro. We demonstrate that arginase I is localized in azurophil granules of neutrophils and constitutes a novel antimicrobial effector pathway, likely through arginine depletion in the phagolysosome. Our findings demonstrate important differences between murine and human leukocytes with respect to regulation and function of arginine metabolism via arginase.