[Blood oxygen transport in rats during lipopolysaccharide administration combined with modification of L-arginine-No system]

Lipopolysacharide from Escherichia coli was intravenously administered to rats (5.0 mg/kg). L-arginine-No system was modified by intravenous injection of L-arginine, N(G)-nitro-L-arginine methyl ester or L-lysine-N(G)-acetamidine (nitric oxide synthase (NOS) substrate, nonselective NOS inhibitor, and selective inducible NOS inhibitor, respectively.) Lipopolysacharide-induced disorders of blood oxygen transport were the least during the selective inducible NOS inhibition. The protective effects of L-arginine and N(G)-nitro-L-arginine methyl ester were less prominent. Such features of NOS modification effect on the blood oxygen transport suggest that activation of inducible NOS may change the hemoglobin-oxygen affinity during the lipopolysacharide treatment.