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Cloning, expression, and functional analysis of human dopamine D1 receptors.

Abstract：

AIM:To construct an HEK293 cell line stably expressing human dopamine D1 receptor (D1R). METHODS:cDNA was amplified by RT-PCR using total RNA from human embryo brain tissue as the template. The PCR products were subcloned into the plasmid pcDNA3 and cloned into the plasmid pcDNA3.1. The cloned D1R cDNA was sequenced and stably expressed in HEK293 cells. Expression of D1R in HEK293 cells was monitored by the [3H]SCH23390 binding assay. The function of D1R was studied by the cAMP accumulation assay, CRE-SEAP reporter gene activity assay, and intracellular calcium assay. RESULTS:An HEK293 cell line stably expressing human D1R was obtained. A saturation radioligand binding experiment with [3H]SCH23390 demonstrated that the Kd and Bmax values were 1.5+/-0.2 nmol/L and 2.94+/-0.15 nmol/g of protein, respectively. In the [3H]SCH23390 competition assay, D1R agonist SKF38393 displaced [3H]SCH23390 with an IC50 value of 2.0 (1.5-2.8) micromol/L. SKF38393 increased the intracellular cAMP level and CRE-SEAP activity through D1R expressed in HEK293 cells in a concentration-dependent manner with an EC50 value of 0.25 (0.12-0.53) micromol/L and 0.39 (0.27-0.57) micromol/L at 6 h/0.59 (0.22-1.58) micromol/L at 12 h, respectively. SKF38393 also increased the intracellular calcium level in a concentration-dependent manner with EC50 value of 27 (8.6-70) nmol/L. CONCLUSION:An HEK293 cell line stably expressing human D1R was obtained successfully. The study also demonstrated that the CRE-SEAP activity assay could be substituted for the cAMP accumulation assay for measuring increase in cAMP levels. Thus, both intracellular calcium measurements and the CRE-SEAP activity assay are suitable for high-throughput screening in drug research.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Sun WC,Jin L,Cao Y,Wang LZ,Meng F,Zhu XZ

doi

10.1111/j.1745-7254.2005.00017.x

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

27-32

issue

1

eissn

1671-4083

issn

1745-7254

pii

APHS017

journal_volume

26

pub_type

杂志文章

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