Original Articles

Role of Nitric Oxide and Metallothionein in Cytotoxic Activity of Cadmium in Caco-2 Cells

Abstract

Cadmium (Cd) induces carcinogenicity and cytotoxicity through a variety of mechanisms. Metallothioneins (MTs) play critical roles in metal detoxification and radical scavenging. Here we evaluated the possible involvement of NO and MT in Cd-induced toxicity and resistance development. By utilizing Cd-resistant Caco-2 cells as a model of chronic exposure to Cadmium, we observed that Cd decreased Caco-2 cell proliferation, whereas Cd-resistant cells showed a lower sensitivity to Cd cytotoxicity. L-NAME as an iNOS inhibitor and cPTIO as an NO scavenger induced a significant reduction in Cd-mediated toxicity of parent Caco-2 in spite of resistant cells. In resistant cells, iNOS mRNA expression was declined; however, MT protein synthesis was increased following acute and chronic Cd exposure. It seems that NO synthesis involves in Cd-induced cytotoxicity, while elevated MT expression is associated with Cd detoxification and resistance.

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IssueVol 56, No 5 (2018) QRcode
SectionOriginal Articles
Keywords
Heavy metal Detoxification Free radical iNOS Colon carcinoma

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How to Cite
1.
Malekmarzban F, Seyedabadi M, Ghahremani MH, Aliebrahimi S, Habibollahi P, Tavajohi S, Ostad SN. Role of Nitric Oxide and Metallothionein in Cytotoxic Activity of Cadmium in Caco-2 Cells. Acta Med Iran. 2018;56(5):287-294.