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Related Experiment Videos

Steroid effects on uveal transport.

R A Stone, C M Wilson

    Ophthalmic Research
    |January 1, 1984
    PubMed
    Summary

    Hydrocortisone significantly reduces cholic acid accumulation in rabbit ciliary body-iris tissue. This effect is not protein synthesis-dependent, suggesting a direct impact on transport mechanisms.

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    Area of Science:

    • Ophthalmology
    • Pharmacology
    • Cell Biology

    Background:

    • The ciliary body-iris is crucial for ocular fluid dynamics and drug transport.
    • Understanding how corticosteroids affect ocular tissue is vital for glaucoma management.
    • Cholic acid and p-aminohippuric acid are key markers for active transport processes in ocular tissues.

    Purpose of the Study:

    • To investigate the effect of hydrocortisone on cholic acid accumulation in the rabbit ciliary body-iris.
    • To determine if hydrocortisone's action is mediated by protein synthesis.
    • To compare the effects of hydrocortisone and deoxycorticosterone on ocular solute uptake.

    Main Methods:

    • Isolated rabbit ciliary body-iris preparations were used.
    • Uptake of cholic acid, p-aminohippuric acid, and alpha-aminoisobutyric acid was measured.
    • Hydrocortisone and deoxycorticosterone were applied at 10(-4)M.
    • Cycloheximide pretreatment was employed to assess protein synthesis involvement.

    Main Results:

    • Hydrocortisone (10(-4)M) significantly inhibited cholic acid accumulation.
    • Hydrocortisone showed minimal to no effect on p-aminohippuric acid and alpha-aminoisobutyric acid uptake.
    • The inhibitory effect of hydrocortisone was rapid and not prevented by cycloheximide.
    • Deoxycorticosterone inhibited both cholic acid and p-aminohippuric acid uptake.

    Conclusions:

    • Hydrocortisone directly inhibits cholic acid transport in the ciliary body-iris, independent of protein synthesis.
    • The mechanism of hydrocortisone action appears to involve direct interference with the cholic acid transport system.
    • Deoxycorticosterone exhibits broader inhibitory effects on solute uptake compared to hydrocortisone.

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