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Objective To investigate the association of single nucleotide polymorphisms (SNPs) of loci rs4570625,rs11178997 at promoter region of tryptophan hydroxylase 2 (TPH2) genes with alcohol dependence and depressive symptom in the alcohol-dependent subjects in north Chinese Han people.Methods Genotype and allele frequencies of the TPH2 rs4570625 and rs1 1178997 polymorphisms were examined in 60 alcohol-dependent subjects (patient group) and 62 normal controls (control group) by Polymerase Chain Reaction (PCR) amplification and DNA sequencing techniques.The alcohol-dependent subjects were evaluated by 24 Hamilton Depression Scale (HAMD).Association analysis was carried out between the polymorphism and symptom of depression in the alcohol-dependent subjects.Results There were significantly statistical differences in the rs4570625 alleles (G and T) (x2 =5.280,P＜0.05),but no statistically significant differences in the genotypes (G/G,G/T,T/T) (x2 =5.078,P＞0.05) between patient group and control group.Significant statistically difference could be found in the rs4570625 alleles (G and T) between the alcohol-dependent subjects who had depressive symptoms and the subjects who did not have depressive symptoms (P＜0.05),but no significantly statistical differences could be found in the genotypes frequency (P＞0.05).No significant statistically differences in the genotype and allele frequencies of the rs 11178997 were observed between the alcohol-dependent subjects and normal controls and the alcohol-dependent subjects who had depressive symptoms and the subjects who did not have depressive symptoms (all P＞0.05).Conclusion The results suggest that the liability of alcohol dependence and depressive symptoms in alcohol-dependent subjects may be associated with the polymorphisms of TPH2 rs4570625 in north Chinese Han population,and the variant of the T allele may contribute to the morbidity.However,the polymorphisms of TPH2 rs1 1178997 may have no association with the susceptibility of alcohol dependence and the depressive symptoms accompanied with alcohol dependence.
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10.3969/j.issn.2095-4344.2013.24.013
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Tumorigenesis is a complex process that is regulated by a variety of network signals. With the continuous development of the process, tumor cells gradually exhibit lots of hallmarks.Tumor cells have the characteristics of unlimited proliferation, resistance to apoptosis, evading immune surveillance, among others. As a unique organelles, mitochondria play an important role in cellular energy metabolism, reactive oxygen species producing and apoptosis process. Particularly, mitochondria have a close relationship with tumor development. In this review, we focus on the essential role of mitochondria in tumor cells development.