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Areca-nut toxicity in cultured human buccal epithelial cells
K Sundqvist1, Y Liu, P Erhardt
1Department of Toxicology, Karolinska Institute, Stockholm, Sweden.
Abstract:
In cultured human buccal epithelial cells, at doses of 3-540 micrograms/ml, areca-nut extract significantly decreased viability, as determined by colony-forming efficiency, clonal growth rate, ability to take up neutral red and ability to exclude trypan blue, and also caused significant formation of DNA single-strand breaks and DNA protein cross-links. Comparisons of the areca nut-related compounds, 3-(N-nitrosomethylamino)propion-aldehyde (NMPA), 3-(N-nitrosomethylamino)propionitrile (NMPN), N-nitrosoguvacoline, N-nitrosoguvacine, arecoline, arecaidine, guvacoline and guvacine, in terms of the above endpoints, indicate that NMPA is ten times more cytopathic to buccal cells than the other agents on a molar basis. Because metabolism of NMPA can potentially yield several reactive breakdown products, including aldehydes, this study indicates that both the parent compound and its metabolites may contribute to the observed pathobiological effects. Taken together, the observed pathobiological effects of areca-nut extract and certain related compounds in cultured human buccal epithelial cells indicate that these agents may contribute to the oral carcinogenicity associated with chewing betel quid.
Insights
Areca nut extract and its compounds damage human buccal cells, reducing viability and causing DNA damage. The compound 3-(N-nitrosomethylamino)propion-aldehyde (NMPA) is particularly potent, suggesting a role in oral cancer risk.
Area of Science:
- Oral pathology
- Toxicology
- Molecular biology
Background:
- Betel quid chewing, containing areca nut, is linked to oral cancer.
- The specific cellular mechanisms underlying this carcinogenicity are not fully understood.
- Areca nut contains various compounds, including nitrosamines, that may be cytotoxic.
Purpose of the Study:
- To investigate the cytotoxic effects of areca nut extract and its related compounds on human buccal epithelial cells.
- To identify specific compounds responsible for the observed cellular damage.
- To assess the potential contribution of these effects to oral carcinogenesis.
Main Methods:
- Cultured human buccal epithelial cells were exposed to areca nut extract and specific areca nut-related compounds.
- Cell viability was assessed using colony-forming efficiency, clonal growth rate, neutral red uptake, and trypan blue exclusion.
- DNA damage was evaluated by measuring single-strand breaks and DNA-protein cross-links.
Main Results:
- Areca nut extract significantly decreased cell viability and induced DNA damage (single-strand breaks, DNA-protein cross-links) in a dose-dependent manner.
- Among the tested compounds, 3-(N-nitrosomethylamino)propion-aldehyde (NMPA) exhibited the highest cytopathic effect on a molar basis, being ten times more potent than others.
- The parent compound NMPA and its potential reactive metabolites likely contribute to the observed pathobiological effects.
Conclusions:
- Areca nut extract and its constituents, particularly NMPA, exert significant cytotoxic effects on human buccal epithelial cells.
- These cellular effects, including reduced viability and DNA damage, provide a mechanistic link between areca nut consumption and oral cancer.
- Further research into NMPA metabolism and its role in carcinogenesis is warranted.