Summary
This ultracytochemical study was undertaken to determine whether increased arteriolar permeability in acute hypertension is accompanied by altered localisation of the ouabain-sensitive, K+-dependent p-nitrophenylphosphatase (K+-NPPase), a component of the Na+, K+-ATPase system. Rats were injected with horseradish peroxidase (HRP) intravenously and acute hypertension was induced by a 2-min infusion of angiotensin amide. Rats were killed at 3 and 15 min, following which brains were sliced and reacted for demonstration of K+-NPPase and HRP reaction product. Vessels of normotensive and hypertensive rats that were nonpermeable to HRP showed discontinuous distribution of K+-NPPase on the outer plasma membranes of endothelial and adventitial cells of arterioles and endothelial cells and pericytes of capillaries. Arterioles of the hypertensive rats which were permcable to HRP showed marked reduction of K+-NPPase localisation in their walls at 3 min while at 15 min when the blood pressure had returned to resting levels the enzyme localisation was similar to controls. This study demonstrates transient alteration of the NA+, K+-ATPase system during increased endothelial permeability in acute hypertension. The implication of this finding and our previous observation of reduced Ca2+-ATPase localisation in endothelial plasma membranes in acute hypertension has been discussed.
Similar content being viewed by others
References
Betz AL, Firth JA, Goldstein GW (1980) Polarity of the bloodbrain barrier: distribution of enzymes between the luminal and antiluminal membranes of brain capillary endothelial cells. Brain Res 192:17–28
De La Sierra A, Coca A, Aguilera MT, Urbano A (1988) Abnormal Na+, K+ ATPase kinetics in a subset of essential hypertensive patients. Eur J Clin Invest 18:337–342
De The H, Devynck MA, Rosenfeld J, Pernollet MG, Elghozi JL, Meyer P (1984) Plasma sodium pump inhibitor in essential hypertension and normotensive subjects with hypertensive heredity. J Cardiovasc Pharmacol 6:S49-S54
Ernst SA (1975) Transport ATPase cytochemistry: ultrastructural localization of potassium-dependent and potassium-independent phosphatase activities in rat kidney cortex. J Cell Biol 66:586–608
Firth JA (1977) Cytochemical localization of the K+ regulation interface between blood and brain. Experientia 33:1093–1094
Fujimoto K, Ogawa K (1982) Enzyme cytochemical study of rat cardiac muscle II. CA++-ATPase and ouabain-sensitive, K+-dependent p-nitrophenylphosphatase. Acta Histochem Cytochem 15:338–354
Haddy FJ, Overbeck HW (1976) The role of humoral agents in volume expanded hypertension. Life Sci 19:935–947
Lombard JH, Joyner WL, Stekiel WJ (1987) Reduced electrogenic sodium-potassium pump in arterioles during renovascular hypertension. Hypertension [Suppl III] 9:86–90
MacGregor GA, Fenton S, Alaghband-Zadeh J, Markandu N, Roulston JE, De Wardener HE (1981) Evidence for a raised concentration of a circulating sodium transport inhibitor in essential hypertension. Br Med J 283:1355–1357
Manjeet S, Kim MK (1987) Decreased Na+ K+ ATPase activity in the aortic endothelium and smooth muscle of the spontaneously hypertensive rats. Clin Exp Theory Pract A9:797–812
Masuzawa T, Ohta T, Kawamura M, Nakahara N, Sato F (1984) Immunohistochemical localization of Na+, K+ ATPase in the choroid plexus. Brain Res 302:357–362
Mayahara H, Ogawa K (1980) Ultracytochemical localization of ouabain-sensitive potassium-dependent p-nitrophenyl-phosphatase activity in the rat kidney. Acta Histochem Cytochem 13:90–102
Mayahara H, Fujimoto K, Ando T, Ogawa K (1980) A new one step method for the cytochemical localization of ouabainsensitive potassium-dependent p-nitrophenylphosphatase activity. Histochemistry 67:125–138
Nag S (1985) Ultrastructural localisation of monosaccharide residues on cerebral endothelium. Lab Invest 5:553–558
Nag S (1988) Localisation of calcium-activated adenosine triphosphatase (Ca2+-ATPase) in intracerebral arterioles in acute hypertension. Acta Neuropathol (Berl) 75:547–553
Nag S, Harik SI (1987) Cerebrovascular permeability to horseradish peroxidase in hypertensive rats: effects of unilateral locus ceruleus lesion. Acta Neuropathol (Berl) 73:247–253.
Nag S, Robertson DM, Dinsdale H (1979) Quantitative estimate of pinocytosis in acute experimental hypertension. Acta Neuropathol (Berl) 46:107–116
Opie LH, Davey DA (1986) Biological membranes in hypertension: is control of intracellular calcium and other ions mediated by a membrane defect. Hypertension 488:154–173
Overbeck HW, Pamnani MB, Akera T, Brody TM, Haddy FJ (1976) Depressed function of a ouabain-sensitive sodiumpotassium pump in blood vessels from renal hypertensive dogs. Circ Res 38:48–52
Overbeck HW, Wallick ET, Shikuma R, Magargal WW (1988) Hypertensive dog plasma inhibits the Na+, K+ pump of cultured vascular smooth muscle. Hypertension 12:32–38
Pamnani M, Huot S, Buggy J, Clough D, Haddy F (1981) Demonstration of a humoral inhibitor of the Na+−K+ pump in some models of experimental hypertension. Hypertension 3:96–101
Postnov YV, Orlov SN, Kravtsov GM, Gulak PV (1984) Calcium transport and protein content in cell plasma membranes of spontaneously hypertensive rats. J Cardiovasc Pharmacol 6:S21-S27
Rostgaard J, Moller O (1980) Localization of Na+, K+-ATPase to the inside of the basolateral cell membranes of epithelial cells of proximal and distal tubules in rabbit kideny. Cell Tissue Res 212:17–28
Schwartz M, Ernst SA, Siegal GJ, Agranoff BW (1981) Immunocytochemical localisation of (Na+, K+)-ATPase in the goldfish optic nerve. J Neurochem 36:107–115
Stahl WL, Baskin DG (1984) Immunocytochemical localization of Na+, K+ adenosine triphosphatase in the rat retina. J Histochem Cytochem 32:248–250
Vorbrodt AW, Lossinsky AS, Wisniewski HM (1982) Cytochemical localization of ouabain-sensitive, K+-dependent p-nitrophenylphosphatase (transport ATPase) in the mouse central and peripheral nervous systems. Brain Res 243:225–234
Zidek W, Vetter H, Dorst KG, Zumkley H, Losse H (1982) Intracellular Na+ and Ca2+ activities in essential hypertension. Clin Sci 63:41s-43s
Author information
Authors and Affiliations
Additional information
Supported by the Heart and Stroke Foundation of Ontario
Rights and permissions
About this article
Cite this article
Nag, S. Ultracytochemical localisation of Na+, K+-ATPase in cerebral endothelium in acute hypertension. Acta Neuropathol 80, 7–11 (1990). https://doi.org/10.1007/BF00294215
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00294215