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Updated: May 18, 2026
Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations
Published on: January 10, 2015
Evaluation of cytotoxicity of different tobacco product preparations
Subhashini Arimilli1, Brad E Damratoski, Betsy Bombick
1Department of Microbiology & Immunology, Wake Forest University School of Medicine, Wake Forest Biotech Place, Winston-Salem, NC 27101, USA. sarimill@wfubmc.edu
Abstract:
Acute exposure to cigarette smoke or its components triggers diverse cellular effects, including cytotoxicity. However, available data regarding the potential cytotoxic effects of smokeless tobacco (ST) extracts lack consensus. Here, we investigated the relative biological effects of 2S3 reference ST, and whether ST elicits differential cellular/molecular responses compared to combustible tobacco product preparations (TPPs) prepared from 3R4F cigarettes. Total particulate matter (TPM) and whole smoke conditioned medium (WS-CM) were employed as combustible TPPs, while the ST extract was used as non-combustible TPP. HL60, THP1 cells and human PBMCs were used to examine the effects of TPPs in short-term cell culture. Corresponding EC(50) values, normalized for nicotine content of the TPPs, suggest that combustible TPPs induced higher cytotoxicity as follows: WS-CM TPM ≥ ≫ST extract>nicotine. While all three TPPs induced detectable levels of DNA damage and IL8 secretion, the combustible TPPs were significantly more potent than the ST preparation. The major PBMC subsets showed differential cytotoxicity to combustible TPPs as follows: CD4>CD8>monocytes>NK cells. These findings suggest that, relative cytotoxic and other cell biological effects of TPPs are dose-dependent, and that ST extract is the least cytotoxic TPP tested in this study.
Insights
Smokeless tobacco (ST) extracts show lower cytotoxicity than combustible tobacco products (TPPs). This study found ST to be the least cytotoxic TPP, with effects being dose-dependent.
Area of Science:
- Toxicology
- Cell Biology
- Tobacco Science
Background:
- Acute exposure to cigarette smoke causes cellular effects, including cytotoxicity.
- Limited consensus exists on the cytotoxic effects of smokeless tobacco (ST) extracts.
- Understanding tobacco product preparation (TPP) cytotoxicity is crucial for public health.
Purpose of the Study:
- To investigate the relative biological effects of a reference smokeless tobacco (ST) product.
- To compare the cellular and molecular responses of ST extract to combustible tobacco product preparations (TPPs).
- To assess the dose-dependent cytotoxicity and genotoxicity of different TPPs.
Main Methods:
- Prepared combustible TPPs (total particulate matter and whole smoke conditioned medium) and a non-combustible ST extract.
- Exposed HL60, THP1 cells, and human peripheral blood mononuclear cells (PBMCs) to TPPs in short-term cultures.
- Measured cytotoxicity (EC50 values normalized for nicotine), DNA damage, and IL8 secretion.
Main Results:
- Combustible TPPs exhibited significantly higher cytotoxicity than ST extract (WS-CM TPM ≥ ≫ ST extract > nicotine).
- All TPPs induced DNA damage and IL8 secretion, with combustible TPPs being more potent.
- Differential cytotoxicity was observed in PBMC subsets: CD4 > CD8 > monocytes > NK cells.
Conclusions:
- Relative cytotoxic and cell biological effects of TPPs are dose-dependent.
- ST extract demonstrated the least cytotoxicity among the tested TPPs.
- Findings highlight differential cellular responses to various tobacco product preparations.
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