Liposome-Encapsulated Curcumin Suppresses Growth of Head and Neck Squamous Cell Carcinoma In vitro and in Xenografts through the Inhibition of Nuclear Factor κB by an AKT-Independent Pathway

• Published in: Clinical cancer research Vol. 14; no. 19; pp. 6228 - 6236
• Main Authors: Wang, Dorothy, Veena, Mysore S., Stevenson, Kerry, Tang, Christopher, Ho, Baran, Suh, Jeffrey D., Duarte, Victor M., Faull, Kym F., Mehta, Kapil, Srivatsan, Eri S., Wang, Marilene B.
• Format: Journal Article
• Language: English
• Published: American Association for Cancer Research 01-10-2008
• Subjects: AKT; Head and neck cancer; Liposomal curcumin; NFκB; Tumor suppression
• ISSN: 1078-0432; 1557-3265
• DOI: 10.1158/1078-0432.CCR-07-5177

Purpose: The purpose of this study was to determine whether a liposomal formulation of curcumin would suppress the growth of head
and neck squamous cell carcinoma (HNSCC) cell lines CAL27 and UM-SCC1 in vitro and in vivo .
Experimental Design: HNSCC cell lines were treated with liposomal curcumin at different doses and assayed for in vitro growth suppression using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. A reporter gene assay was
done on cell lines to study the effect of liposomal curcumin on nuclear factor κB (NFκB) activation. Western blot analysis
was done to determine the effect of curcumin on the expression of NFκB, phospho-IκBα, phospho-AKT (pAKT), phospho-S6 kinase,
cyclin D1, cyclooxygenase-2, matrix metalloproteinase-9, Bcl-2, Bcl-xL, Mcl-1L, and Mcl-1S. Xenograft mouse tumors were grown
and treated with intravenous liposomal curcumin. After 5 weeks, tumors were harvested and weighed. Immunohistochemistry and
Western blot analyses were used to study the effect of liposomal curcumin on the expression of NFκB and pAKT.
Results: The addition of liposomal curcumin resulted in a dose-dependent growth suppression of both cell lines. Liposomal curcumin
treatment suppressed the activation of NFκB without affecting the expression of pAKT or its downstream target phospho-S6 kinase.
Expression of cyclin D1, cyclooxygenase-2, matrix metalloproteinase-9, Bcl-2, Bcl-xL, Mcl-1L, and Mcl-1S were reduced, indicating
the effect of curcumin on the NFκB pathway. Nude mice xenograft tumors were suppressed after 3.5 weeks of treatment with i.v.
liposomal curcumin, and there was no demonstrable toxicity of liposomal curcumin upon autopsy. Immunohistochemistry and Western
blot analysis on xenograft tumors showed the inhibition of NFκB without affecting the expression of pAKT.
Conclusions: Liposomal curcumin suppresses HNSCC growth in vitro and in vivo . The results suggest that liposomal curcumin is a viable nontoxic therapeutic agent for HNSCC that may work via an AKT-independent
pathway.