期刊
MOLECULAR PSYCHIATRY
卷 9, 期 1, 页码 55-64出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.mp.4001357
关键词
serotonin receptor; polymorphism; 5-HT; m-CPP
资金
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT [Z01HD001206, ZIAHD001206] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON ALCOHOL ABUSE AND ALCOHOLISM [Z01AA000290, Z01AA000303] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [ZIADC000047, Z01DC000047] Funding Source: NIH RePORTER
A human serotonin (5-HT)(2C) receptor gene polymorphism leads to the substitution of cysteine for serine at codon 23 (Cys23Ser); the frequency of the Ser23 allele in unrelated Caucasians is approximately 0.13. In the present study, we assessed whether Cys23Ser could affect receptor function. The two alleles were functionally compared following expression in COS-7 cells. The constitutive activity of the receptor in an in situ reconstitution system was also evaluated following expression of each allele in Sf9 cells. Using radioligands, Ser23-expressed membranes showed reduced high-affinity binding to meta-chlorophenylpiperazine (m-CPP) and 5-HT. Although the amplitude of the 5-HT-induced intracellular Ca2+ peak did not differ between the alleles, Ser23 required higher 5-HT concentrations to elicit the same response. These differences might be due to more extensive desensitization in the Ser23 form. In the in situ reconstitution system, the 5-HT2C receptor displayed considerable constitutive activity, with the Ser23 allele being significantly higher in this regard than the Cys23 form. After prolonged serum deprivation in order to resensitize the receptor, four of the 15 cells expressing Ser23 showed abnormally higher m-CPP-induced sensitivity of the Ca2+ response. These results indicate that the Ser23 allele may be constitutively more active than Cys23. Thus, Ser23 appears to be an abundant candidate allele capable of directly influencing interindividual variation in behavior, susceptibility to mental disorder, and response to drugs including atypical antipsychotic and some antidepressant drugs that are potent 5-HT2C inverse agonists or antagonists.
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