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Transport of p-aminohippurate in renal cortical slices of rats of different ages following treatment with thyroid hormones.

Following treatment with thyroid hormones PAH accumulation is increased in renal cortical slices of 5-, 10-, 20-, 30-, 50- and 105-day-old rats. Both thyroid hormones are more effective in young than in adult rats. A single dose of T3 or T4 (20 micrograms/100 g b.m.) administered 24 h before measurement is effective whereas acute effects of T3 or T4 on PAH transport could not be demonstrated. Treatment with thyroid hormones (20 micrograms/100 g b.m., 3 days, once a day) is without any influence on body mass; there is a tendency to an increase of kidney mass following treatment with T3 or T4. Simultaneous administration of an inhibitor of protein biosynthesis (neomycin, 1 or 5 mg/100 g b.m.) reduces the effect of T3 treatment. An additional low dose of T3, 24 h before measurement of PAH transport can restore the effect of T3 treatment which was performed 9 days before.