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Delayed administration of the nitric oxide precursor l-arginine increases brain injury in models of focal cerebral ischemia. We tested the hypothesis that l-arginine worsens the damage by acting as a substrate for inducible nitric oxide synthase (iNOS) and increasing the output of this enzyme. iNOS-null mice or wild-type littermates were treated with l-arginine (300 mg/kg; i.p, three times/day) starting...
We investigated whether the reduction in ischemic brain injury in inducible nitric oxide synthase (iNOS) null mice is related to the iNOS gene copy number, and whether such protection is long lasting. The middle cerebral artery (MCA) was occluded in heterozygous (+/-) and homozygous (-/-) iNOS null mice, as well as in wild-type littermates (iNOS +/+). Four days after MCA occlusion, total infarct volume...
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