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| Item Type: | Article |
|---|---|
| Title: | Na+/H+ exchange in human lymphocytes and platelets in chronic and subacute metabolic acidosis |
| Creators Name: | Reusch, H.P., Reusch, R., Rosskopf, D., Siffert, W., Mann, J.F. and Luft, F.C. |
| Abstract: | The effect of acid-base disturbances on sodium/proton (Na+/H+) exchange has been examined in animal models; however, few data are available from human studies. To test the effect of metabolic acidosis on Na+/H+ exchange in man, as well as to examine the relationship between Na+/H+ exchange and cytosolic calcium ([Ca2+]i), we measured both variables in patients with decreased renal function with mild metabolic acidosis (pH 7.34 +/- 0.06), in normal control subjects (pH 7.41 +/- 0.02), and in subjects before (pH 7.40 +/- 0.01), and after (pH 7.26 +/- 0.04) ammonium chloride (NH4Cl) 15 g for 5 d. Lymphocytes and platelets were loaded with the cytosolic pH (pHi) indicator 2'-7'-bis(carboxyethyl)-5,6-carboxyfluorescein and acidified to pH approximately 6.6 with propionic acid. To quantitate Na+/H+ exchange, dpHi/dt was determined at 1 min. [Ca2+]i was measured with fura-2. Na+/H+ exchange was significantly increased only in lymphocytes of patients with renal insufficiency. Neither intracellular pH (pHi) nor [Ca2+]i was different from controls. NH4Cl resulted in a significant increase in Na+/H+ exchange in lymphocytes, but not in platelets of normal subjects. Values of pHi and [Ca2+]i in either cell type remained unaffected. Since metabolic acidosis influenced Na+/H+ only in lymphocytes, but not in platelets, it is possible that protein synthesis may be involved in increasing Na+/H+ exchange. |
| Keywords: | Renal Tubular Acidosis, Acute Disease, Blood Platelets, Carbon Dioxide, Carrier Proteins, Chronic Disease, Electrolytes, Fluorescent Dyes, Hydrogen-Ion Concentration, Kinetics, Lymphocytes, Sodium-Hydrogen Antiporter |
| Source: | Journal of Clinical Investigation |
| ISSN: | 0021-9738 |
| Publisher: | American Society for Clinical Investigation |
| Volume: | 92 |
| Number: | 2 |
| Page Range: | 858-865 |
| Date: | August 1993 |
| Official Publication: | https://doi.org/10.1172/JCI116660 |
| PubMed: | View item in PubMed |
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