In vitro effects of prolactin and cortisol on water permeability of the urinary bladder of the teleost Gillichthys mirabilis

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Abstract
Urinary bladders of the euryhaline teleost Gillichthys mirabilis were maintained in organ culture under defined conditions for four days. Examination of bladders cultured in medium containing cortisol or prolactin or both hormones indicates that cortisol increases bladder water permeability and that prolactin antagonizes the cortisol effect, causing a reduction in water permeability. Bladders co‐cultured with teleost pituitaries or with teleost rostral pars distalis is show a pronounced reduction in osmotic permeability. The effects of prolactin and cortisol in vivo appear to be reproducible in vitro.