The lysyl oxidase LOX is absent in basal and squamous cell carcinomas and its knockdown induces an invading phenotype in a skin equivalent model

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Charbel BouezPascal Sommer

Abstract

Lysyl oxidase initiates the enzymatic stage of collagen and elastin cross-linking. Among five isoforms comprising the lysyl oxidase family, LOX is the better studied. LOX is associated to an antitumor activity in ras-transformed fibroblasts, and its expression is down-regulated in many carcinomas. The aim of this work was to shed light on LOX functions within the epidermis by studying its expression in human basal and squamous cell carcinomas and analyzing the effect of its enzymatic activity inhibition and protein absence on human keratinocytes behavior in a skin equivalent. In both carcinomas, LOX expression by epidermal tumor cells was lacking, while it was up-regulated around invading tumor cells in association with the stromal reaction. Lysyl oxidase activity inhibition using beta-aminoproprionitrile in a skin equivalent model prepared with both primary human keratinocytes and HaCaT cell line affected keratin 10 and filaggrin expression and disorganized the collagen network and the basement membrane. In spite of all these changes, no invasion phenotype was observed. Modelization of the invasive phenotype was only noticed in the skin equivalent developed with LOX antisense HaCaT cell line, where the protein LOX is specifica...Continue Reading

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