Abstract
This is a review of recent work based on an in vitro model which has allowed us to investigate the postnatal maturation of renal epithelial cells. Renal proximal tubule cells from 8- to 40-day-old Sprague-Dawley rats were studied after 48 h of primary culture. The regulation of intracellular pH (pHi) was measured by quantitative fluorescence microscopy using 2′,7′-bis(carboxyethyl)-5(6)-carboxyfluorescein (BCECF). Recordings were made under basal conditions and after imposing a cytoplasmic alkalosis or acidosis using 15 mM ammonium salt. The ability of the cells to recover from both acidosis and alkalosis improved during post-natal maturation. The improvement in recovery from intracellular acidosis could be entirely accounted for by an increase in the rate of Na+/H+ exchange. The capacity for Na+/H+ exchange was independent of the cellular growth rate, but depended on cellular differentiation. A developmental increase in the activity of Cl−/HCO3-exchange between 12 and 14 days of age was also demonstrated. No developmental change was seen in either steady-state pHi (7.27–7.35) or in cytoplasmic buffer capacity (37.6–44.4 mM/pHi). The characteristics of transporter maturation revealed by these experiments are very similar to those observed in isolated perfused proximal tubules of developing rabbits.
Similar content being viewed by others
References
Alpern RJ (1990) Cell mechanisms of proximal tubule acidification. Physiol Rev 70: 79–114
Ylppö A (1916) Neugeborenen-, Hunger-und Intoxikationsacidosis in ihren Beziehungen zueinander. Studien über Acidosis bei Säuglingen, in besondere im Lichte des Wasserstoffionen-“Stoffwechsels”. Zeitschr. Kinderheilk 14: 1–184
Kildeberg P (1964) Disturbances of hydrogen ion balance occurring in premature infants. II. Late metabolic acidosis. Acta Paediatr 53: 517–526
Edelmann CM Jr, Rodriguez-Soriano J, Boichis H, Gruskin AB, Acosta MI (1967) Renal bicarbonate reabsorption and hydrogen ion excretion in normal infants. J Clin Invest 46: 1309–1317
Svenningsen NW (1974) Renal acid-base titration studies in infants with and without metabolic acidosis in the postneonatal period. Pediatr Res 8: 659–672
Reimold EW, Dinh Don T, Worthen HG (1977) Renal failure during the first year of life. Pediatrics 59: 987–994
Anand SK (1982) Acute renal failure in the neonate. Pediatr Clin North Am 29: 791–800
Ekblad H, Kero P, Takala J (1985) Slow sodium acetate infusion in the correction of metabolic acidosis in premature infants. Am J Dis Child 139: 708–710
Sulyok E, Heim T, Soltész G, Jászai V (1972) The influence of maturity on renal control of acidosis in newborn infants. Biol Neonate 21: 418–435
Schwartz GJ, Evan AP (1983) Development of solute transport in rabbit proximal tubule. I. HCO −3 and glucose absorption. Am J Physiol 245: F382-F390
Baum M (1990) Neonatal rabbit juxtamedullary proximal convoluted tubule acidification. J Clin Invest 85: 499–506
Baum M (1992) Developmental changes in rabbit juxtamedullary proximal convoluted tubule acidification. Pediatr Res 31: 411–414
Grinstein S, Rotin D, Mason MJ (1989) Na+/H+-exchange and growth factor induced cytosolic pH changes. Role in cellular proliferation. Biochim Biophys Acta 988: 73–97
Aronson PS (1985) Kinetic properties of the plasma membrane Na+−H+ exchanger. Annu Rev Physiol 47: 545–560
Aronson PS, Nee J, Suhm MA (1982) Modifier role of internal H+ in activating the Na+−H+ exchanger in renal microvillus membrane vesicles. Nature 299: 161–163
Sardet C, Franchi A, Pouysségur J (1989) Molecular cloning, primary structure, and expression of the human growth factor-activatable vatable Na+/H+ antiporter. Cell 56: 271–280
Rao GN, Roux N de, Sardet C, Pouysségur J, Berk BC (1991) Na+/H+-antiporter gene expression during monocytic differentiation of HL60 cells. J Biol Chem 266: 13485–13488
Moolenaar WH, Tsien RY, Saag PT van der, Laat SW de (1983) Na+/H+ exchange and cytoplasmic pH in the action of growth factors in human fibroblasts. Nature 304: 645–648
Bianchini L, Woodside M, Sardet C, Pouysségur J, Takai A, Grinstein S (1991) Okadaic acid, a phosphatase inhibitor, induces activation and phosphorylation of the Na+/H+ antiport. J Biol Chem 266: 15406–15413
Soleimani M, Lesione GA, Bergman JA, McKinney TD (1991) A pH modifier site regulates activity of the Na+:HCO −3 -cotransporter in basolateral membranes of kidney proximal tubules. J Clin Invest 88: 1135–1140
Larsson S, Aperia A, Lechene C (1986) Studies on final differentiation of rat renal proximal tubular cells in culture. Am J Physiol 251: C455-C464
Harris RC, Seifter JL, Lechene C (1986) Coupling of Na−H exchange and Na−K pump activity in cultured rat proximal tubule cells. Am J Physiol 251: C815-C824
Larsson SH, Aperia A, Lechene C (1988) Studies on terminal differentiation of rat renal proximal tubular cells in culture: ouabain-sensitive K and Na transport. Acta Physiol Scand 132: 129–134
Larsson SH, Fukuda Y, Kölare S, Aperia A (1990) Proliferation and intracellular pH in cultured proximal tubular cells. Am J Physiol 258: F697-F704
Larsson SH, Yun S, Kölare S, Aperia A (1990) Postnatal changes in growth of rat proximal tubule cells. A study of cells in short primary culture. Acta Physiol Scand 138: 243–244
Larsson SH, Larsson L, Lechene C, Aperia A (1989) Studies of terminal differentiation of electrolyte transport in the renal proximal tubule using short-term primary cultures. Pediatr Nephrol 3: 363–368
Ekblad H, Aperia A, Larsson SH (1992) Intracellular pH regulation in cultured proximal tubule cells in different stages of maturation. Am J Physiol 263: F716-F721
Alpern RJ, Chambers M (1986) Cell pH in the rat proximal convoluted tubule. J Clin Invest 78: 502–510
Roberts AB, Sporn MB (1988) Transforming growth factor beta. Adv Cancer Res 51: 107–145
Nielsen-Hamilton M (1990) Transforming growth factor-b and its actions on cellular growth and differentiation. Curr Top Dev Biol 24: 95–136
Bratt E, Nyctelius H, Aperia A, Larsson SH (1992) Transforming growth factor β 1 inhibits proliferation but does not induce differentiation in infant renal epithelial cells. Proceedings of the Annual Meeting of the European Society for Pediatric Research, Pediatr. Res. 32, p 626
Fukuda Y, Bertorello A, Aperia A (1991) Ontogeny of the regulation of Na+,K+-ATPase activity in the renal proximal tubule cell. Pediatr Res 30: 131–134
Larsson SH, Rane S, Fukuda Y, Aperia A, Lechene C (1990) Changes in Na influx precede postnatal increase in Na,K-ATPase activity in rat renal proximal tubular cells. Acta Physiol Scand 138: 99–100
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Larsson, S.H., Ekblad, H. & Bratt, E. Short-term primary cultures in studies of post-natal maturation of the rat proximal tubule - proton and bicarbonate transport. Pediatr Nephrol 7, 798–801 (1993). https://doi.org/10.1007/BF01213363
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01213363