Prolactin signaling downregulates Claudin-3 and-4 with low β-casein expression.
Glucocorticoid signaling upregulates Claudin-3 and -4 without β-casein expression.
Prolactin and glucocorticoid signaling specifically downregulates Claudin-4.
Prolactin and glucocorticoid signaling induce lactation-specific tight junctions.
Prolactin and glucocorticoid signaling synergistically upregulate β-casein expression.