Expression of D4 receptors in thoracic aorta from SD rats was examined by laser scanning confocal microscope. Briefly, the aorta was cleared of blood with ice-cold oxygenated saline and kept in Histochoice (Amresco, Solon, OH) for one to two days at 4°C, then sectioned (4 μm), embedded in paraffin, and mounted on slides. The sections were double-immunostained with mouse anti-D4 receptor antibody (1:100) and rabbit polyclonal anti-α-SM-actin antibody (1:100). The colocalization of D4 receptors and α-SM-actin was performed as described previously [18 (link)].
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