(Hypertension. 1997;29:194.)
© 1997 American Heart Association, Inc.
Arthur C. Corcoran Memorial Lecture |
From the Department of Physiology, Medical College of Wisconsin, Milwaukee.
Correspondence to Ai-Ping Zou, MD, PhD, Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226
This study examined the production of nitric oxide (NO) in the renal cortex and medulla through the use of an in vivo microdialysis technique. Oxyhemoglobin (OxyHb) at a concentration of 3 µmol/L was perfused through the dialysis system to trap tissue NO. Methemoglobin (MetHb), which was formed by NO oxidation of OxyHb in the dialysate, was spectrophotometrically assayed at 401 nm. Because the oxidation of OxyHb to produce MetHb is stoichiometric with NO, the production of NO can be determined by the rate of MetHb formation. We found that NO concentration was significantly higher (P<.05) in the medulla (57.1±5.57 nmol/L, n=10) than in the cortex (31.2±5.7 nmol/L, n=9). The minimal detectable NO level of this assay is
10 nmol/L. Intravenous infusion of L-arginine (3 mg/kg per minute) for 30 minutes produced a twofold to threefold increase in cortical and medullary NO; NG-nitro-L-arginine methyl ester (L-NAME) (10 µg/kg per minute) decreased NO by 33% in the renal cortex and by 46.5% in the renal medulla. We have also compared under the same conditions the degradation products of NO, nitrite, and nitrate in the renal cortex and medulla using in vivo microdialysis combined with microtiter plate colorimetry. Nitrite/nitrate concentration was significantly higher (P<.05) in the medulla (2.7±0.6 µmol/L, n=4) than in the cortex (2.1±0.2 µmol/L, n=4). Infusion of L-arginine increased cortical and medullary nitrite/nitrate by 65% and 39%, respectively. L-NAME reduced cortical and medullary nitrite/nitrate by 18% and 23%, respectively. The results indicate that the OxyHb-NO microdialysis trapping technique is a highly sensitive in situ method for detecting regional tissue NO concentration and changes in the NO synthase activity in the kidney. These studies have shown that NO concentration is higher in medullary tissue than in the cortex.
Key Words: spectrophotometry rats nitric oxide microdialysis kidney
Abbreviations: L-NAME = NG-nitro-L-arginine methyl ester MetHb = methemoglobin NO = nitric oxide NOS = nitric oxide synthase OxyHb = oxyhemoglobin PBS = phosphate-buffered saline SNP = sodium nitroprusside SOD = superoxide dismutase
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