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6-O-Methylinosine is a hypoxanthine analogue. Hypoxanthine is a kind of purine base mainly present in muscle tissue. And it is a metabolite produced by purine oxidase acting on xanthine. Hypoxanthine has typical anti-inflammatory effects and is a potential endogenous poly(ADP-ribose) polymerase (PARP) inhibitor. It is cytoprotective by inhibiting PAPR activity, inhibiting peroxynitrite-induced mitochondrial depolarization and secondary superoxide production. Hypoxanthine can also be used as an indicator of hypoxia[1][2].

ChEBI: 6-O-methylinosine is inosine carrying a methyl substituent on the oxygen at position 6 on the hypoxanthine ring. It has a role as a metabolite. It is functionally related to an inosine.

[1] Virág L, Szabó C. Purines inhibit poly(ADP-ribose) polymerase activation and modulate oxidant-induced cell death. FASEB J. 2001 Jan;15(1):99-107. DOI:10.1096/fj.00-0299com
[2] Saugstad OD. Hypoxanthine as an indicator of hypoxia: its role in health and disease through free radical production. Pediatr Res. 1988 Feb;23(2):143-50. DOI:10.1203/00006450-198802000-00001