Prevention of oral carcinogenesis in rats by Dracaena cinnabari resin extracts
In vivo study was performed to determine the chemopreventive efficacy of the DC resin methanol extract on a 4-nitroquinoline-1-oxide (4NQO) oral cancer animal model.
Materials and methods
This study involves administration of 4NQO solution for 8 weeks alone (cancer induction) or with Dracaena cinnabari (DC) extract at 100, 500, and 1000 mg/kg. DC extract administration started 1 week before exposure until 1 week after the carcinogen exposure was stopped. All rats were sacrificed after 22 weeks, and histological analysis was performed to assess any incidence of pathological changes. Immunohistochemical expressions of selected tumor marker antibodies were analyzed using an image analyzer computer system, and the expression of selected genes involved in apoptosis and proliferative mechanism related to oral cancer were evaluated using RT2-PCR.
The incidence of OSCC decreased with the administration of DC extract at 100, 500, and 1000 mg/kg compared to the induced cancer group. The developed tumor was also observed to be smaller when compared to the induced cancer group. The DC 1000 mg/kg group inhibits the expression of Cyclin D1, Ki-67, Bcl-2, and p53 proteins. It was observed that DC 1000 mg/kg induced apoptosis by upregulation of Bax and Casp3 genes and downregulation of Tp53, Bcl-2, Cox-2, Cyclin D1, and EGFR genes when compared to the induced cancer group.
The data indicated that systemic administration of the DC resin methanol extract has anticarcinogenic potency on oral carcinogenesis.
Chemoprevention with DC resin methanol extract may significantly reduce morbidity and possibly mortality from OSCC.
KeywordsDracaena cinnabari Chemoprevention Oral squamous cell carcinoma 4-Nitroquinoline 1-oxide
This study was financially supported by PPP Grant (PG060-2014A), University of Malaya, Malaysia.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The animal study was approved by the Institutional Animal Care and Use Committee (IACUC), Faculty of Medicine, University of Malaya, Malaysia (Ethics No. 2014-02-14/OBBS/R/NAA).
For this type of study, formal consent is not required.
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