Abstract
The renal excretion of organic acids involves three mechanisms: glomerular filtration, active tubular secretion and passive tubular reabsorption. The postnatal development of each of these mechanisms was assessed in piglets. From birth to 8 weeks of life glomerular filtration rate (GFR) and clearance of p-amino-hippurate (PAH) rose twofold while the maximal tubular secretion of PAH (TmPAH) rose fourfold. Thus, the active secretion increased in parallel with GFR when the transport mechanism was unsaturated, whereas it increased about twofold more than GFR at saturation point. Age differences in the passive reabsorption were evaluated by using sulphachlorpyridazine (SCP) as test substance. Although the renal handling of SCP includes both secretion and reabsorption, the age-dependent rise in the ratio between clearance of ultrafiltrable SCP and GFR indicated a relative decrease in reabsorption with age.
Similar content being viewed by others
References
Fetterman, G.H., Shuplock, N.A., Philipp, F.J. and Gregg, H.S., 1965. The growth and maturation of human glomeruli and proximal convolutions from term to adulthood. Pediatr., 35:601–619.
Friis, C., 1979. Postnatal development of renal function in piglets: Glomerular filtration rate, clearance of PAH and PAH extraction. Biol. Neonate, 35:180–187.
Friis, C., 1980a. Postnatal development of the pig kidney: Ultrastructure of the glomerulus and the proximal tubule. J. Anat., 130: 513–526.
Friis, C., 1980b. P-Aminohippurate transport in the developing pig kidney: A study of glomerulotubular balance. (In preparation).
Friis, C., 1981. Postnatal development of renal function in piglets: Changes in excretory pattern of sulphachlorpyridazine. Acta Pharmacol. Toxicol., 48:409–417.
Friis, C., Aarup, V., Nielsen, P. and Rasmussen, F., 1980. Drug elimination during postnatal maturation in piglets. Proc. IPVS Congress, Copenhagen, p. 282.
Hook, J.B. and Bailie, M.D., 1979. Perinatal renal pharmacology. Annu. Rev. Pharm. Tox., 19:491–509.
Horster, M., Kemler, B.J. and Valtin, H., 1971. Intracortical distribution of volume of glomeruli during postnatal maturation in the dog. J. Clin. Invest., 50:796–800.
Horster, M. and Larsson, L., 1976. Mechanism of fluid absorption during proximal tubule development. Kidney Int., 10:348–363.
Spitzer, A. and Edelmann, C.M., 1971. Maturational changes in pressure gradients for glomerular filtration. Am. J. Physiol., 221:1431–1435.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Friis, C. Renal excretion of drugs during postnatal development in piglets. Vet Res Commun 7, 349–352 (1983). https://doi.org/10.1007/BF02228644
Issue Date:
DOI: https://doi.org/10.1007/BF02228644