Background: Nicotine is the foremost chemical constituent responsible for addiction in tobacco products, in the non-ionized condition can be easily absorbed via epithelial tissue of the lung, the mouth, the nose and across the skin
Objective:The study examines the harmful effect of the nicotine which is an important component of cigarette in vitro.
Type of the study: Cross-sectional study.
Methods: Examines the harmful effect of the nicotine which is an important component of cigarette in vitro by using two types of lung cancer cell lines (H460 TP53+/+, H441 TP53-/-).
Results: The results showed the total count of H460( TP53+/+) cancer lung cell lines was (5.2 ×106 cells /ml) , the number (4.9 ×106 cells /ml) of them were alive and (3.6×105 cells /ml) of them were dead, with percentage of viability (93.15%), while the total count of H441( TP53-/-) lung cancer cells was (5.1 ×106 cells /ml), the number (4.1 ×106 cells /ml) of them were alive, and the number (9.9×105 cells /ml) of them were dead with percentage of viability (80.55%). And it revealed that the nicotine inhibited viability of H460 lung cancer cell lines in all concentrations (1, 10, 500 and 1000 μ M) and the cells were completely abolished by treatment with (1000 μ M) when the viability reached to minimum percentage (3.43%), while nicotine induced proliferation in H441 lung cancer cell lines even in lowest concentration (1 μ M), whereas the viability reached to maximum percentage (41.04%) at concentration (1000 μ M). Also it noticed that the treatment with nicotine at concentrations (1,10, 500 and 1000 μ M ) for 24 and 48 hr induced the apoptosis but not necrosis in H460 lung cancer cell lines, especially at the highest concentrations (1000 μ M) for 48hr when the percentage of apoptosis reached to the maximum value (55.5%), however it was induced proliferation in H441 lung cancer cell lines with highest proliferation at concentration (1000 μ M), when the percentage apoptosis value reached to the minimum percentage (1.5%) when compared to un treated cells (control).
Conclusions: the cells lack to TP53(H441 TP53-/-) will proliferate when exposed to nicotine and some of these cells will suffer from necrosis as a replacement of apoptosis.
