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Nitrogen radicals, generation and

Protonated nitrogen heterocycles can be carbalkoxylated" by treatment with esters of a-keto acids and Fenton s reagent. Pyridine is carbalkoxylated at C-2 and C-4, for example. The attack is by "COOR radicals generated from the esters ... [Pg.934]

Reactive nitrogen species are another factor of free radical damage in rheumatoid arthritis, although their role is less studied than that of oxygen radicals. Stichtenoth and Frolich [242] pointed out that the inhibition of nitric oxide synthesis had beneficial effects in humans. Mazzetti et al. [243] found that IL-1(3 stimulated NO production in RA chondrocytes. We demonstrated that NO synthase of RA neutrophils generated the enhanced amount of peroxynitrite [234]. Nitric oxide and oxygen radicals are also important inducers of death of human osteoarthritic synoviocytes [244]. [Pg.932]

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