Journal Article

Zyflamend® reduces LTB<sub>4</sub> formation and prevents oral carcinogenesis in a 7,12-dimethylbenz[α]anthracene (DMBA)-induced hamster cheek pouch model

Peiying Yang, Zheng Sun, Diana Chan, Carrie A. Cartwright, Mary Vijjeswarapu, Jibin Ding, Xiaoxin Chen and Robert A. Newman

in Carcinogenesis

Volume 29, issue 11, pages 2182-2189
Published in print November 2008 | ISSN: 0143-3334
Published online August 2008 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgn181
Zyflamend® reduces LTB4 formation and prevents oral carcinogenesis in a 7,12-dimethylbenz[α]anthracene (DMBA)-induced hamster cheek pouch model

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Aberrant arachidonic acid metabolism, especially altered cyclooxygenase and 5-lipoxygenase (LOX) activities, has been associated with chronic inflammation as well as carcinogenesis in human oral cavity tissues. Here, we examined the effect of Zyflamend®, a product containing 10 concentrated herbal extracts, on development of 7,12-dimethylbenz[α]anthracene (DMBA)-induced inflammation and oral squamous cell carcinoma (SCC). A hamster cheek pouch model was used in which 0.5% DMBA was applied topically onto the left cheek pouch of male Syrian golden hamsters either three times per week for 3 weeks (short term) or 6 weeks (long term). Zyflamend was then applied topically at one of three different doses (25, 50 and 100 μl) onto the left cheek pouch three times for 1 week (short-term study) or chronically for 18 weeks. Zyflamend significantly reduced infiltration of inflammatory cells, incidence of hyperplasia and dysplastic lesions, bromodeoxyuridine-labeling index as well as number of SCC in a concentration-dependent manner. Application of Zyflamend (100 μl) reduced formation of leukotriene B4 (LTB4) by 50% compared with DMBA-treated tissues. The reduction of LTB4 was concentration dependent. The effect of Zyflamend on inhibition of LTB4 formation was further confirmed with in vitro cell-based assay. Adding LTB4 to RBL-1 cells, a rat leukemia cell line expressing high levels of 5-LOX and LTA4 hydrolase, partially blocked antiproliferative effect of Zyflamend. This study demonstrates that Zyflamend inhibited LTB4 formation and modulated adverse histopathological changes in the DMBA-induced hamster cheek pouch model. The study suggests that Zyflamend might prevent oral carcinogenesis at the post-initiation stage.

Journal Article.  5851 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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