Inhibition of growth and survival of human head and neck squamous cell carcinoma cells by curcumin via modulation of nuclear factor-kappaB signaling

International Journal of Cancer. Journal International Du Cancer
Sita AggarwalBharat B Aggarwal

Abstract

Increased expression of proinflammatory and proangiogenic factors are associated with aggressive tumor growth and decreased survival of patients with head and neck squamous cell carcinoma (HNSCC). In as much as genes that are regulated by nuclear factor NF-kappaB suppress apoptosis, induce proliferation, and mediate inflammation, angiogenesis and tumor metastasis, agents that suppress NF-kappaB activation have potential as treatment for various cancers including HNSCC. We demonstrate that all HNSCC cell lines expressed constitutively active NF-kappaB and IkappaBalpha kinase (IKK), which is needed for NF-kappaB activation. Treatment of MDA 686LN cells with curcumin (diferuloylmethane), a pharmacologically safe chemopreventive agent, inhibited NF-kappaB activation through abrogation of IKK. As a result expression of various cell survival and cell proliferative genes including Bcl-2, cyclin D1, IL-6, COX-2 and MMP-9 was suppressed. This, in turn, inhibits proliferation of all HNSCC cell lines, arrests cell cycle in G1/S phase (MDA 686LN) and induces apoptosis as indicated by upstream and downstream caspase activation, PARP cleavage, annexin V staining in MDA 686LN cells. Suppression of NF-kappaB by cell-permeable p65-based peptide...Continue Reading

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