Materials
Carbenoxolone disodium salt, dexamethasone-21-phosphate disodium salt and cortisol were purchased from Sigma-Aldrich (St. Louis, MO, USA). Carbenoxolone disodium salt and dexamethasone-21-phosphate disodium salt were dissolved in sterile saline to achieve the final concentration as indicated. Cortisol was dissolved in ethanol as a stock and then diluted by culture media to final concentration.