Steroid effects on uveal transport

Hydrocortisone (10(-4)M) causes a significant depression of cholic acid accumulation by the isolated rabbit ciliary body-iris while causing little, if any, depression of p-aminohippuric acid uptake and not affecting alpha-aminoisobutyric acid uptake. Because no lag period is present for this inhibition and because cyclohexamide pretreatments fails to eliminate it, the hydrocortisone effect does not appear to be mediated by a protein synthesis mechanism. Deoxycorticosterone (10(-4)M) not only inhibits cholic acid uptake but also depresses p-aminohippuric acid uptake; no deoxycorticosterone effect on alpha-aminoisobutyric acid uptake is seen.