The Mineralocorticoid Receptor Plays a Transient Role in Mouse Skin Development

The study investigated the role of the mineralocorticoid receptor (MR) in mouse skin development, focusing on its expression during embryonic stages and its impact on epidermal differentiation. MR expression peaked at embryonic day 16.5 (E16.5) and decreased thereafter, suggesting a transient role in skin maturation. MR−/− mice exhibited increased epidermal thickness and altered differentiation, but these changes resolved postnatally, indicating potential compensation by the glucocorticoid receptor (GR). The study concluded that MR plays a temporary role in epidermal development, with GR possibly compensating for MR loss during the perinatal period. The findings highlighted the distinct regulatory roles of MR and GR in skin development, with GR having a more critical function in maintaining epidermal integrity.