Differential Effects of All-Trans Retinoic Acid on the Growth of Human Keratinocytes and Mouth Carcinoma Epidermoid Cultures. Involvement of GRIM-19 and Complex I of the Respiratory Chain

Abstract

Squamous cell carcinoma (SSC) is the most frequent malignant tumor of the oral cavity. A study on the effect of all-trans retinoic acid (RA) on cell growth, expression of GRIM-19 and content and activity of complex I of the mitochondrial respiratory chain in normal human keratinocytes (NHEK) and mouth carcinoma cells with low (HN) and high (KB) transformation grade was carried out. In NHEK cells, RA treatment resulted in growth suppression, significant overexpression of GRIM-19 protein, enhanced content of complex I but depressed activity of NADH-UQ oxidoreductase activity of the complex. In HN cells, RA treatment depressed cell growth, inhibited the enzymatic activity of complex I but had no significant effect on the levels of GRIM-19 and complex I. In KB cells RA had no effect on cell growth, GRIM-19 expression, content and activity of complex I.

Keywords

retinoic acid GRIM19 NADH-UQ oxidoreductase keratinocytes squamous cell carcinoma mitochondria

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