Isolated human aortal SMC (passage 1) were obtained from Cell Applications (Cat. No. 354-05a; San Diego, CA, USA) and Innoprot (Cat. No. P10456; Derio, Spain). Cells were thawed and immediately processed for expression analysis without further culture. Primary murine aortic SMC were isolated as described above and cultured in collagen I-coated (100 μg ml−1; Corning) 24-well plates for 7 days. Cells were transfected on day 0 with siRNAs directed against murine Gprc5b (Mm_Gprc5b_6; target sequence: 5′-TCGGGCCTACATGGAGAACAA-3′) or AllStars negative control siRNA using Lipofectamine RNAiMAX. All siRNAs were obtained from Qiagen.
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