NR3C1 and Nasal polyposis: Furthermore, the ratio of GRα/GRβ and GC affinity were observed to increase after the p38 MAPK or JNK pathways were blocked by specific inhibitors, SB203580 and SP600125, respectively, indicating that the p38 MAPK and JNK signal pathways are indeed involved in regulating the ratio of GR isoforms and GC sensitivity in IL-1β-induced nasal polyp tissues in vitro.