Total cytoplasmic RNA was obtained from human lymphocytes by using the acid guanidinium thiocyanate phenol method. Quantitative real-time reverse transcriptase-polymerase chain reaction (RT-PCR) assay [25 (link)–28 (link)] of A1, A2A, A2B, and A3 ARs messenger RNAs (mRNAs) was performed using gene-specific fluorescently labeled TaqMan MGB Probe (minor groove binder) in an ABI Prism 7700 Sequence Detection System (Applied Biosystems, Foster City, CA, USA). Real-time RT-PCR for A1, A2A, A2B, and A3 ARs was carried out with the Assays-on-Demand TM Gene expression Products NM_000674, NM_000675, NM_000676, and NM_000677 (Applied Biosystems), respectively. For the real-time RT-PCR of the reference gene, the endogenous control human β-actin was used, and the probe was fluorescently labeled with VIC™ dye (Applied Biosystems).
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