Posters

      The Impact Of Switching To pMRTP On The Development Of Cigarette Smoke - Induced COPD In C57BL/6 Mice

      Veljkovic, E.; Phillips, B.; Peck, M. J.; Buettner, A.; Vuillaume, G.; Boue, S.; Martin, F.; Hoeng, J.; Peitsch, M. C.

      Conference date
      Feb 26, 2015
      Conference name
      Society for Research on Nicotine and Tobacco (SRNT) 2015
      Link to more information
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      Topic
      Summary

      In this study, the impact on the development of emphysema/COPD following inhalation of aerosol from two tobacco products, a reference cigarette (3R4F) and a prototypic modified risk tobacco product (pMRTP), was evaluated in C57Bl/6 mice. The mice were exposed to an aerosol from 3R4F (750 µg/l of total particulate matter – TPM), pMRTP or filtered air for 4 hours per day, 5 days per week, up to 7 months. Aerosols from both tobacco products used had the same nicotine concentration - 34.4 µg/l. After 2 months of exposure to 3R4F, switching and cessation groups were exposed to pMRTP aerosol or filtered air, respectively. To analyze the progression of emphysema, evaluations of inflammation, pulmonary function, and various histopathological and molecular changes (transcriptomics, proteomics and lipidomics) were performed at months 1, 2, 3, 4, 5 and 7. Exposure to 3R4F induced molecular, cellular and physiological modifications in lungs leading to emphysematous changes. Animals exposed to pMRTP exhibited negligible changes in all parameters assessed. Both cessation and switching groups showed a reversal of the inflammatory and functional responses induced by 3R4F smoke. Histopathological evaluation revealed a slowdown in the progression of emphysematous changes in switching and cessation groups.  Smoking cessation or switching resulted in the rapid recovery at the transcription level. The lipid and protein profiles in lung similarly showed a clear response to 3R4F aerosol exposure, with minimal changes associated with pMRTP exposure, and recovery near to sham-exposed levels following either switching or cessation. Moreover, majority of 3R4F induced gene expression and protein level changes matched. These data demonstrate that exposure to pMRTP for up to 7 months resulted in a response similar to fresh air-exposed animals using a battery of physiological and molecular measures. Furthermore, following a 2 month 3R4F cigarette smoke exposure period, both cessation and switching to a pMRTP aerosol resulted in the reversal or stabilization of parameters assessed.

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      Reduced Risk Products ("RRPs”) is the term we use to refer to products that present, are likely to present, or have the potential to present less risk of harm to smokers who switch to these products versus continuing smoking. PMI has a range of RRPs in various stages of development, scientific assessment and commercialization. All of our RRPs are smoke-free products that deliver nicotine with far lower quantities of harmful and potentially harmful constituents than found in cigarette smoke.