NR4A2 transactivates the distal PRL promoter in synoviocytes. A. RT-PCR was conducted with primers specific for exon 1A and exon 2 of PRL or GAPDH and products were resolved on an agarose gel. PRL primers yielded the expected product size of 275 bp, indicating the presence of exon 1A in PRL transcripts. GAPDH specific primers produced the expected product size of 451 bp. Lanes 1–3 contained the following PCR templates: cDNA from control transduced K4IM cells, cDNA from NR4A2 transduced K4IM cells, and negative control. B. K4IM synoviocytes were transiently transfected in triplicate with a distal PRL promoter (−3000 bp) luciferase reporter and control or NR4A2 expression vectors as indicated. Relative luciferase units (RLUs) were measured in cell lysates 48 hours post-transfection. **p < 0.005.