Analysis of plasma metabolic biomarkers in the development of 4‑nitroquinoline‑1‑oxide‑induced oral carcinogenesis in rats

Kong,Xiangli; Yang,Xiaoqin; Zhou,Jinglin; Chen,Sixiu; Li,Xiaoyu; Jian,Fan; Deng,Pengchi; Li,Wei

doi:10.3892/ol.2014.2619

Analysis of plasma metabolic biomarkers in the development of 4‑nitroquinoline‑1‑oxide‑induced oral carcinogenesis in rats

Authors:
- Xiangli Kong
- Xiaoqin Yang
- Jinglin Zhou
- Sixiu Chen
- Xiaoyu Li
- Fan Jian
- Pengchi Deng
- Wei Li
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Affiliations: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China, Department of Oral and Maxillofacial Surgery, Guangdong Provincial Stomatological Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan 610041, P.R. China
Published online on: October 15, 2014 https://doi.org/10.3892/ol.2014.2619
Pages: 283-289

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Abstract

The aim of the present study was to identify time‑dependent changes in the expression of metabolic biomarkers during the various stages of oral carcinogenesis to provide an insight into the sequential mechanism of oral cancer development. An 1H nuclear magnetic resonance (NMR)‑based metabolomics approach was used to analyze the blood plasma samples of Sprague‑Dawley rats exhibiting various oral lesions induced by the administration of 4‑nitroquinoline‑1‑oxide (4NQO) in drinking water. The 1H NMR spectra were processed by principal component analysis (PCA) and partial least‑squares discriminant analysis (PLS‑DA) to determine the metabolic differences between the three developmental stages of oral mucosa cancer (health, oral leukoplakia [OLK] and oral squamous cell carcinoma [OSCC]). The variable importance in projection (VIP) score derived from the PLS‑DA model was used to screen for important metabolites, whose significance was further verified through analysis of variance (ANOVA). Data from the present study indicated that 4NQO‑induced rat oral carcinogenesis produced oral pre‑neoplastic and neoplastic lesions and provided an effective model for analyzing sequential changes in the 1H NMR spectra of rat blood plasma. The 1H NMR‑based metabolomics approach clearly differentiates between healthy, OLK and OSSC rats in the PCA and PLS‑DA models. Furthermore, lactic acid, choline, glucose, proline, valine, isoleucine, aspartic acid and 2‑hydroxybutyric acid demonstrated VIP>1 in the PLS‑D model and P<0.05 with ANOVA. It was also identified that increases in lactic acid, choline and glucose, and decreases in proline, valine, isoleucine, aspartic acid and 2‑hydroxybutyric acid may be relative to the characteristic mechanisms of oral carcinogenesis. Therefore, these plasma metabolites may serve as metabolic biomarkers in oral carcinogenesis and assist in the early diagnosis and preventive treatment of oral cancer.

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