With their unique structure and physico-chemical properties, single walled carbon
nanotubes (SWCNTs) have many potential new applications in medicine and industry. However,
there is lack of detailed information concerning their impact on human health and the
environment. The aim of this study was to assess the effects, after intra peritoneal
injection of functionalized SWCNTs (f-SWCNT) on the induction of reactive oxygen species
(ROS), frequency of structural chromosomal aberrations (SCA), frequency of micronuclei
(MN) induction, mitotic index (MI) and DNA damage in Swiss-Webster mice. Three doses of
f-SWCNTs (0.25, 0.5 and 0.75 mg/Kg) and two controls (negative and positive) were
administered to mice, once a day for five days. Bone marrow and peripheral blood samples
were collected 24 hours after the last treatment following standard protocols. F-SWCNT
exposure significantly enhanced ROS, increased (p<0.05) the number
of SCA and the frequency of micro-nucleated cells, increased DNA damage, and decreased the
mitotic index in exposed groups compared to negative control. The scientific findings
reported here suggest that purified f-SWCNT have the potential to induce oxidative stress
mediated genotoxicity in Swiss-Webster mice at higher level of exposure. Further
characterization of their systemic toxicity, genotoxicity, and carcinogenicity is also
essential.