This study assessed the acute toxicity and tissue distribution of graphene oxide decorated with platinum nanoparticles (GO/PtNPs) in rats.

Key findings:

Rats received a single intraperitoneal dose of 300 or 2000 mg/kg and were examined after 14 days.
All animals survived, showed no notable behavioral abnormalities, and gained weight normally.
GO/PtNPs accumulated mainly in the abdominal cavity near the injection site, forming black deposits within granulomas.
Nanoparticle-containing macrophages were found in the mesenteric lymph nodes, liver, spleen, lungs, and kidneys.
Observed tissue changes included:

Degeneration in cardiac and skeletal muscle
Liver hydropic degeneration
Acute tubular necrosis in kidneys, particularly at the high dose
Brain hyperemia, cribriform changes, hemorrhage, and gliosis

No GO/PtNP deposits were detected in brain tissue or cerebral blood vessels.

Overall conclusion:
At doses substantially above anticipated therapeutic levels, GO/PtNPs produced extensive tissue deposition and selected organ toxicities, despite no mortality or overt clinical illness. The authors recommend additional studies using clinically relevant doses, administration routes, exposure durations, and controls before considering medical applications.

Tags: acute nanomaterial toxicity in ratsgranuloma formation from graphene oxidehigh-dose tissue damage from nanomaterialsimplications of nanoparticleIntraperitoneal platinum-graphene oxide toxicitymacrophage-mediated nanoparticle distributionnanoparticle accumulation in abdominal cavityneurological effects of nanomaterials in ratsorgan-specific effects of GO/PtNPsrenal and hepatic toxicity of platinum-graphene oxidesafety assessment of graphene oxide-based nanomedicinetissue deposition of graphene oxide nanoparticles