Estimation of renal interstitial adenosine and purine metabolites by microdialysis
| Autor: | R. L. Baranowski, Christof Westenfelder |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Microdialysis Adenosine Kidney Cortex Physiology Renal cortex Kidney Rats Sprague-Dawley chemistry.chemical_compound Adenosine Triphosphate Internal medicine medicine Animals Kidney metabolism Xanthine Iothalamic Acid Rats Endocrinology medicine.anatomical_structure chemistry Purines Regional Blood Flow Renal blood flow Uric acid Extracellular Space medicine.drug |
| Zdroj: | American Journal of Physiology-Renal Physiology. 267:F174-F182 |
| ISSN: | 1522-1466 1931-857X |
| DOI: | 10.1152/ajprenal.1994.267.1.f174 |
| Popis: | It has been proposed that adenosine, derived from ATP and released into the renal interstitium, mediates a reduction in renal function in ischemic acute renal failure. Because no direct measurements of interstitial adenosine are available, we evaluated an in vivo microdialysis technique to assess the levels of adenosine and its metabolites in the cortex of the normal rat kidney (n = 6). Microdialysis probe implantation did not alter cortical renal blood flow, glomerular filtration rate, or fractional sodium excretion. The interstitial concentration of adenosine was 199 +/- 53 nM, and relative concentrations of inosine, hypoxanthine, xanthine, and uric acid were 99 +/- 47, 182 +/- 29, and 183 +/- 70 nM and 1.8 +/- 0.4 microM, respectively. Infusion of ATP-MgCl2 (n = 5) resulted in a significant increase in the dialysate levels of adenosine (67 +/- 11 to 378 +/- 97 nM), inosine (230 +/- 102 to 803 +/- 219 nM), and uric acid (3.5 +/- 1.3 to 6.9 +/- 1.7 microM). In conclusion, this study demonstrates that the microdialysis technique is suited to monitor metabolically important substances in the renal interstitium. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|