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*
Merck Research Laboratories, Rahway, NJ 07065; and
Columbia University, New York, NY 10032
Nitric oxide is believed to be a prominent mediator of inflammation based in part on the correlative expression of the inducible nitric oxide synthase (iNOS) gene in various pathologies. The resulting high output of the highly reactive molecule nitric oxide is then believed to play an important role in the evolving inflammatory response. Studies have shown that iNOS and nitric oxide are present in the tissues of patients with multiple sclerosis (MS). In rodent models of MS, experimental autoimmune encephalomyelitis (EAE), it has been shown that nonspecific NOS inhibitors partially ameliorate the disease. To determine the importance of iNOS in this model of MS, we induced EAE in mice containing a disrupted iNOS (NOS2) gene. Surprisingly, by day 24, the NOS2 knockout mice had a greater incidence of EAE than wild-type control mice (75 vs 12%), and had a higher average severity score (2.42 vs 0.44). These differences appear to result largely from the failure of the disease to remit in NOS2 KO mice. Wild-type mice have a profound ability to reverse EAE (82%) compared with the knockout mice (19%). This result implies that iNOS may in some instances play a protective role in autoimmune-mediated tissue destruction.
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