Differences in inflammation and acute phase response but similar genotoxicity in mice following pulmonary exposure to graphene oxide and reduced graphene oxide

The authors investigated toxicity of 2-3 layered >1 ?m sized graphene oxide (GO) and reduced graphene oxide (rGO) in mice following single intratracheal exposure with respect to pulmonary inflammation, acute phase response (biomarker for risk of cardiovascular disease) and genotoxicity. In addition, exposure levels of particulate matter emitted during production of graphene in a clean room and in a normal industrial environment using chemical vapour deposition were assessed. Toxicity was evaluated at day 1, 3, 28 and 90 days (18, 54 and 162 ?g/mouse), except for GO exposed mice at day 28 and 90 where only the lowest dose was evaluated. GO induced a strong acute inflammatory response together with a pulmonary (Serum-Amyloid A, Saa3) and hepatic (Saa1) acute phase response. rGO induced less acute, but a constant and prolonged inflammation up to day 90. Lung histopathology showed particle agglomerates at day 90 without signs of fibrosis. In addition, DNA damage in BAL cells was observed across time points and doses for both GO and rGO. In conclusion, pulmonary exposure to GO and rGO induced inflammation, acute phase response and genotoxicity but no fibrosis.

Authors: Bengtson S, Knudsen KB, Kyjovska ZO, Berthing T, Skaug V, Levin M, Koponen IK, Shivayogimath A, Booth TJ, Alonso B, Pesquera A, Zurutuza A, Thomsen BL, Troelsen JT, Jacobsen NR, Vogel U. ;Full Source: PLoS One. 2017 Jun 1;12(6): e0178355. doi: 10.1371/journal.pone.0178355. eCollection 2017. ;