In vitro malignant transformation of human bronchial epithelial cells induced by benzo (a) pyrene
Zhao, P.; Fu, J.; Yao, B.; Song, Y.; Mi, L.; Li, Z.; Shang, L.; Hao, W.; Zhou, Z.
Toxicology in Vitro An International Journal Published in Association with Bibra 26(2): 362-368
ISSN/ISBN: 0887-2333 PMID: 22227536 DOI: 10.1016/j.tiv.2011.12.013
In this study, the human bronchial epithelial cells (16HBE) were treated five times with 1 ?M benzo(a)pyrene (BaP), followed by 2 passages culture, and thein vitroBaP-induced malignant transformation of 16HBE cells was established. Five colonies in soft agarose were then amplified and donated as T-16HBE-C1?5 cells respectively. T-16HBE-C1?5 cells can form tumors subcutaneously in nude mice. Histopathological changes in the tumors indicated nests growth, high nuclear-cytoplasmic ratios, coarse and clumped chromatin, numerous and distinctly atypical mitoses, cell necrosis and surrounding normal adipose, muscle and connective tissue immersed. In addition, lung metastasis was observed in nude mice in T-16HBE-C1, 3 and 4 groups.In vitrocell migration assay results indicated that T-16HBE-C2?5 cells showed much lower migration capabilities than 16HBE cells. Western blotting analysis showed that the expressions of p53 and p-Akt (Ser473) in T-16HBE-C1?5 cells were significant higher than those in 16HBE cells. Our results demonstrated that BaP could induce the malignant transformation of 16HBE cells, and p53 and p-Akt (Ser473) might play crucial roles in BaP-induced carcinogenesis. The five monoclonal cell lines (T-16HBE-C1?5) with different migration capabilities could be used as research models for further understanding the mechanisms of BaP-induced carcinogenesis and cell migration.