Effect of metallothionein on cell viability and its interactions with cadmium and zinc in HEK293 cells.

Abstract:

:Metallothioneins (MTs) are thought to participate in a wide variety of physiological roles, but the mechanisms involved are still unclear. The study was designed to examine the possible factors related to these mechanisms. Methods, including transfection, MTT assay and flow cytometry, were used to investigate the effect of MTs on cell viability and their interactions with cadmium and zinc in HEK293 cells. The results showed that transient overexpression of human MT1A, MT2 and MT3 genes dynamically affected cell viability, and the effect was influenced by zinc and cadmium ions. Overexpressed MTs with added zinc showed a greater inhibitory effect on cell viability. Overexpressed MTs protected cells against low concentrations of cadmium ions (10 microM), but increased cell death in response to high concentrations (20-50 microM). Out of the three MTs, MT1A was more efficient than MT2 and MT3 in its resistance to cadmium (10 microM), and MT3 together with zinc showed more cell growth inhibition than MT1 and MT2. These results indicate that both of the divalent metal ions that could bind MTs, as well as the individual MT isoforms, affect the role of MTs on cell viability, which may explain in part why the comprehensive effect of MTs on the cells was elusive.

journal_name

Cell Biol Int

authors

Li J,Liu Y,Ru B

doi

10.1016/j.cellbi.2005.05.008

keywords:

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

843-8

issue

10

eissn

1065-6995

issn

1095-8355

pii

S1065-6995(05)00126-5

journal_volume

29

pub_type

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