Abstract
Murine bone marrow cells can produce citrulline directly from L-arginine without intermediate ornithine. An L-arginine-dependent biochemical pathway synthesizing L-citrulline and nitrate, coupled to an effector mechanism has also been recently demonstrated in murine cytotoxic activated macrophages. We show herein that L-citrulline synthesis in murine bone marrow cells can be induced by the generation of superoxide. It can take place in an arginine-free medium, suggesting the implication of a superoxide-dependent peptidyl arginine deiminase.
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