Dexamethasone-d4 is intended for use as an internal standard for the quantification of dexamethasone by GC- or LC-MS. Dexamethasone is a synthetic glucocorticoid that binds the human glucocorticoid receptor with a higher affinity than a natural ligand, cortisol (Kd = 5 nM versus 17 nM, respectively).1 Through receptor activation, dexamethasone has both transactivating and transrepressing effects on gene expression, producing, in general, anti-inflammatory results.2
1.Mulatero, P., Panarelli, M., Schiavone, D., et al.Impaired cortisol binding to glucocorticoid receptors in hypertensive patientsHypertension30(5)1274-1278(1997) 2.Beck, I.M., Vanden Berghe, W., Vermeulen, L., et al.Crosstalk in inflammation: The interplay of glucocorticoid receptor-based mechanisms and kinases and phosphatasesEndocr. Rev.30(7)830-882(2009)