• Ulrike Kogel, Bjoern Titz, Walter K Schlage, Catherine Nury, Florian Martin, Alberto Oviedo, Stefan Lebrun, Ashraf Elamin, Emmanuel Guedj, Keyur Trivedi, Nikolai V Ivanov, Patrick Vanscheeuwijck, Manuel C Peitsch, and Julia Hoeng.
• Philip Morris International Research and Development, Philip Morris Products S.A., Quai Jeanrenaud 5, 2000 Neuchatel, Switzerland(2).
• Regul. Toxicol. Pharmacol. 2016 Nov 30; 81 Suppl 2: S123-S138.

AbstractModified risk tobacco products (MRTPs) are being developed with the aim of reducing smoking-related health risks. The Tobacco Heating System 2.2 (THS2.2) is a candidate MRTP that uses the heat-not-burn principle. Here, systems toxicology approaches were engaged to assess the respiratory effects of mentholated THS2.2 (THS2.2M) in a 90-day rat inhalation study (OECD test guideline 413). The standard endpoints were complemented by transcriptomics and quantitative proteomics analyses of respiratory nasal epithelium and lung tissue and by lipidomics analysis of lung tissue. The adaptive response of the respiratory nasal epithelium to conventional cigarette smoke (CS) included squamous cell metaplasia and an inflammatory response, with high correspondence between the molecular and histopathological results. In contrast to CS exposure, the adaptive tissue and molecular changes to THS2.2M aerosol exposure were much weaker and were limited mostly to the highest THS2.2M concentration in female rats. In the lung, CS exposure induced an inflammatory response, triggered cellular stress responses, and affected sphingolipid metabolism. These responses were not observed or were much lower after THS2.2M aerosol exposure. Overall, this system toxicology analysis complements and reconfirms the results from classical toxicological endpoints and further suggests potentially reduced health risks of THS2.2M.Copyright © 2016. Published by Elsevier Inc.

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