Upregulation of haeme oxygenase-1 by zinc in HCT-116 cells

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
George Loo, Professor (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Haeme oxygenase-1 (HO-1) is often viewed as a cytoprotective gene. Toxic heavy metals induce HO-1, but it is unclear whether particular metal micronutrients also induce HO-1. Hence, the ability of exogenously-added copper, iron and zinc to influence HO-1 expression in HCT-116 cells was evaluated. Under the chosen experimental conditions, only zinc noticeably increased the expression of HO-1 mRNA and protein. Concurrently, zinc decreased non-protein thiol levels to a certain extent, but zinc did not increase the production of reactive oxygen species (ROS). Moreover, ascorbate and Trolox did not inhibit zinc-induced HO-1 upregulation. In contrast, deferoxamine blunted the induction of HO-1 mRNA, protein, and enzymatic activity caused by zinc. Additionally, N-acetylcysteine and Tiron inhibited zinc-induced HO-1 upregulation and also nuclear translocation of nuclear factor erythroid 2-related factor 2 (Nrf2). Collectively, these findings suggest that zinc at above normal levels upregulates HO-1 expression in HCT-116 cells in a ROS-independent manner.

Additional Information

Free Radical Research, 46(9), 1099-1107
Language: English
Date: 2012
N-acetylcysteine, deferoxamine, metals, oxidative stress, Tiron

Email this document to