Drug dependence brings heavy burden to globe medicine and security,however,the mechanism is unclear.And because of the legal question,patients tend to hide their history of drug use,which make the diagnosis difficult.Metabonomics is an emerging system biological technology which can offer a new view about the diseases.This paper reviewed the metabonomics research progress of the main dependence drugs,and proved that metabonomics technology may discover biomarkers for diagnosis and treatment of drug dependence.The relationship between peripheral metabonomics and center nerve system may become an important research field.More information may come from the united apply of genomics,proteomics and metabonomics.Finally,there will be a breakthrough in identification of individuals with susceptibility to drug dependence,and supply a preventive or treatment plan.

Objective To investigate the change of emotion and striatum dopamine transporter(DAT) expression in adult male rats experiencing maternal deprivation, and to explore whether DNA methylation is involved in the regulatory mechanism of DAT expression. Methods Newborn rats were randomly divided into 2 groups: a maternal separation group (n=16) and a control group (n=14). The maternal deprivation group were separated from their mother for 6 hours (09∶00-15∶00) per day from postnatal day 1 to 14, while the controls (n=14) without the deprivation. When the rats in the 2 groups were 12 week, their spontaneous anxiety levels and exploratory ability in novel environments were assessed by an elevated plus maze and an open field test. DAT mRNA expression in the striatum was detected by reverse transcription-PCR, and its DNA methylation level was measured by bisulfated DNA sequencing. Results Maternally-deprived rats showed lower ability of exploring in a new environment and lower levels of anxiety than the controls. The expression of DAT mRNA in the striatum of the maternal separation group (0.236±0.043) was significantly lower than that in the control group (0.480±0.107) (P＜0.05). However the DNA methylation level in the promoter region of DAT was not significantly different between the 2 groups. Conclusion Maternal deprivation influenced the emotion and expression of dopamine transporter in adult rats and DNA methylation may not be involved.