5-羟色胺2A受体基因多态性与利培酮治疗中国首发精神分裂症患者疗效关联

背景5-羟色胺2A受体基因已经证实为精神分裂症的候选易感基因,因为阐明其作为非典型抗精神病药物重要作用靶点减轻阴性症状已引起业界倍加关注.本研究试图探讨(1)5-HT2A受体基因T102C多态性在不同临床亚型之间等位基因和基因型频率的关系,(2)5-HT2A受体基因T102C在利培酮高剂量组和低剂量组之间基因型和等位基因分布频率的关系,(3)5-HT2A受体基因T102C多态性在治疗有效组与无效组之间的基因型和等位基因分布频率的关系,(4)5-羟色胺2A受体T102C基因多态性是否与中国首发精神分裂症患者利培酮疗效有关.方法对201例精神分裂症初发期患者分别进行利培酮治疗[3～5mg/d,平均(3.2±1.3)mg/d],疗程8周.采用聚合酶链式反应扩增与限制性片段长度多态性(PCR-RFLP)技术检测5-HT2A受体基因T102C多态性.以临床亚型将精神分裂症患者划分为偏执型、瓦解型、未定型和其他型,分析不同临床亚型等位基因和基因型频率的差异;按服用利培酮剂量划分低剂量组(＜4mg/d)和高剂量组(≥4 mg/d),经比较利培酮高剂量组和低剂量组的5-HT2A受体基因T102C基因型和等位基因分布频率差异性;同时以阴性和阳性症状量表(PANSS)总减分率＞50%有效,≤50%为无效以分析治疗有效组与无效组之间的基因型和等位基因分布频率差异有无显著性;以PANSS评定患者治疗前及治疗后2周、4周、6周和第8周末的精神症状,比较5-HT2A受体T102C各基因亚型与年龄、发病年龄、PANSS总分值、阳性症状基线分、阴性症状基线分、一般病理症状基线分、PANSS总减分率、阳性症状减分率、阴性症状减分率和一般病理症状减分率的差异.结果5-HT2A受体T102C基因型在患者组分布频率均符合H-W平衡定律(P＞0.05);不同临床诊断亚型精神分裂症患者等位基因和基因型频率无显著性差异(χ2=0.415,P=0.937;χ2=1.705,P=0.941);高剂量组与低剂量组之间的基因型和等位基因分布频率差异均无显著性(χ2=2.402,P=0.301;χ2=2.465,P=0.116);治疗有效和无效组的基因型和等位基因分布频率的差异无显著性(χ2=1.995,P=0.369;χ2=1.939,P=0.164);各基因型亚组的年龄、发病年龄及其病程差异均无显著性(P均大于0.05);但基因亚组A1/A1的治疗前PANSS总分(χ2=4.076,P=0.018)和阴性症状分(χ2=3.946,P=0.021)以及治疗结束PANSS总分减分率(χ2=4.036,P=0.019)和阴性症状减分率(χ2=3.876,P=0.022)均显著高于A1/A2及A2/A2基因型.结论(1)首发精神分裂症患者不同临床亚型5-HT2A受体基因T102C基因型和等位基因频率无显著差异.(2)利培酮高剂量组和低剂量组5-HT2A受体基因T102C基因型和等位基因分布频率没有显著性差异.(3)治疗有效组与无效组之间5-HT2A受体基因T102C基因型和等位基因分布频率也无显著性差异.(4)5-HT2A受体T102CAi/A1基因亚型可能影响中国首发精神分裂症患者对利培酮的治疗效应.

Association between 5-HT2A receptor gene polymorphism and risperidone treatment response in the first episode ( drug-naive)Chinese patients with schizophrenia

Background 5-hydroxytryptamine 2A receptor (5-HT2A) gene has been regarded as a candidate gene for susceptibility to schizophrenia. In particular, the 5-HT2A receptor has received much attention because it demonstrates to be an important site of action of atypical antipsychotic agents to alleviate negative symptoms. The current study investigated whether the 5-hydroxytryptamine 2A receptor (5-HT2A) gene T102C polymorphism was associated with treatment response to risperidone in the first episode Chinese patients with schizophrenia. Methods 201 first episode Chinese Han patients with schizophrenia were given risperidone for up to 56 days. Genotyping of 5-HT2A gene T102C polymorphism were performed by using PCR-RFLP. The Positive and Negative Symptom Scale (PANSS) was used for the evaluation of the severity of psychotic symptoms before and after 8 weeks treatment with risperidone. Results 5-HT2A receptor 102-T/T genotype was significantly associated with both the PANSS total and negative syndrome subscale scores before treatment, and with the reduction rates in both the PANSS total and negative syndrome subscale scores after eight weeks risperidone treatment. Conclusions The results suggest that 5-HT2A T102C A_1/A_1 genotype subgroup influences individual response to risperidone in first-episode Chinese patients with schizophrenia.