Vanadate-Induced Cell Growth Arrest is p53-dependent through Activation of p21 in C141 Cells.
Zhang-Z; Huang-C; Li-J; Shi-X
J Inorg Biochem 2002 Apr; 89(1-2):142-148
Vanadium is widely used in industry. It is a potent toxic agent and carcinogen. The mechanisms involved in its toxicity and carcinogenesis are still unclear. Improper cell growth is believed to be involved in cancer development. The present study investigated the regulation of p53 on vanadate-induced cell growth arrest using both p53 wild type C141 cells and p53 deficient embryo fibroblasts (p53 -/-). On vanadate stimulation, C141 cells exhibited a dose- and time-dependent S phase arrest as determined by DNA content analysis. In contrast, vanadate was unable to increase the percentage of S phase in p53 -/- cells. Luciferase assay showed that vanadate induced p53 activation in a dose- and time-dependent manner in p53 wild type C141 cells. Addition of pifithrin-alpha (PFT), a specific inhibitor of p53, reduced the activation of p53 with a concomitant decrease in growth arrest at S phase. Western blotting analysis demonstrated that vanadate caused a dose- and time-dependent increase of p21 level in C141 cells. Pretreatment of C141 cells with PFT decreased p21 expression induced by vanadate while the p21 expression did not vary in vanadate stimulated p53 -/- cells. The results obtained from the present study suggest that vanadate is able to induce S phase arrest through p53- and p21-dependent pathway.
Vanadium-compounds; Cell-growth; Toxins; Carcinogens; Carcinogenesis; Cancer; Mining-industry; Steel-industry; Occupational-exposure; Workers; Respirable-dust; Particulate-dust; Particulates; Dust-particles; Dusts
Xianglin Shi, Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, USA
Work Environment And Workforce; Research Tools and Approaches; Cancer Research Methods
Journal of Inorganic Biochemistry