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Published in: BMC Cancer 1/2010

Open Access 01-12-2010 | Research article

Effects of ATRA combined with citrus and ginger-derived compounds in human SCC xenografts

Authors: Heather E Kleiner-Hancock, Runhua Shi, Angela Remeika, Delira Robbins, Misty Prince, Jennifer N Gill, Zanobia Syed, Patrick Adegboyega, J Michael Mathis, John L Clifford

Published in: BMC Cancer | Issue 1/2010

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Abstract

Background

NF-κB is a survival signaling transcription factor complex involved in the malignant phenotype of many cancers, including squamous cell carcinomas (SCC). The citrus coumarin, auraptene (AUR), and the ethno-medicinal ginger (Alpinia galanga) phenylpropanoid, 1'-acetoxychavicol acetate (ACA), were previously shown to suppress 12-O-tetradecanoylphorbol-13-acetate (TPA) induced mouse skin tumor promotion. The goal of the present study was to determine whether AUR and ACA are effective either alone or in combination with all-trans retinoic acid (ATRA) for suppressing SCC tumor growth.

Methods

We first determined the effects of orally administered ACA (100 mg/kg bw) and AUR (200 mg/kg bw) on lipopolysaccharide (LPS)-induced NF-κB activation in NF-κB-RE-luc (Oslo) luciferase reporter mice. Dietary administration of AUR and ACA ± ATRA was next evaluated in a xenograft mouse model. Female SCID/bg mice were fed diets containing the experimental compounds, injected with 1 × 106 SRB12-p9 cells s.c., palpated and weighed twice a week for 28 days following injection.

Results

Both ACA and AUR suppressed LPS-induced NF-κB activation in the report mice. In the xenograft model, AUR (1000 ppm) and ACA (500 ppm) modestly suppressed tumor volume. However, in combination with ATRA at 5, 10, and 30 ppm, ACA 500 ppm significantly inhibited tumor volume by 56%, 62%, and 98%, respectively. The effect of ATRA alone was 37%, 33%, and 93% inhibition, respectively. AUR 1000 ppm and ATRA 10 ppm were not very effective when administered alone, but when combined, strongly suppressed tumor volume by 84%.

Conclusions

Citrus AUR may synergize the tumor suppressive effects of ATRA, while ACA may prolong the inhibitory effects of ATRA. Further studies will be necessary to determine whether these combinations may be useful in the control of human SCC.
Appendix
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Metadata
Title
Effects of ATRA combined with citrus and ginger-derived compounds in human SCC xenografts
Authors
Heather E Kleiner-Hancock
Runhua Shi
Angela Remeika
Delira Robbins
Misty Prince
Jennifer N Gill
Zanobia Syed
Patrick Adegboyega
J Michael Mathis
John L Clifford
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2010
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-10-394

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