title: Study of serum and tissues angiotensin converting enzyme (ACE) activity in rat with gentamicin induced renal toxicity.
abstract: OBJECTIVE
  In this research ACE activity (as a marker of epithelial injury) was studied in rats with gentamicin induced renal toxicity.
  
  
  METHODS
  Male Sprague-Dawley rats were sacrificed 1, 3, 5, and 7 days after gentamicin injection, 100 mg/kg/day for 1, 3, 5, and 7 consecutive days. ACE activity was measured in serum, kidney and lung. These data were compared with normal saline-treated rats. Histological scoring of renal cortical pathology was performed on days 1, 3, 5, and 7.
  
  
  RESULTS
  Treatment of rats with gentamicin resulted in renal damage evidenced by proteinuria, polyuria, and decreased creatinine clearance. The damage to the kidney proximal tubule was evident by (a) the histological analysis at light microscopy and (b) the augmentation in the urinary excretion of N-acetyl-beta-D-glucosaminidase (NAG). Kidney ACE activity decreased while lung and serum ACE activity didn't change until day 7. Lung ACE activity increased significantly on day 7. Kidney and serum ACE activity increased too. Blood pressure increased significantly on day 7. This corresponded well with the lung ACE activity increment.
  
  
  CONCLUSIONS
  These data suggest that kidney ACE activity decreased significantly just one day after gentamicin administration and prior to kidney NAG decrease.
authors.affiliation: Department of Pharmacology, Institute of Medicinal Plants ACECR, Tehran, Iran.
authors.forename: Seyed Ali
authors.initials: SA
authors.lastname: Ziai
authors.forename: Pirooz
authors.initials: P
authors.lastname: Salehian
authors.forename: Massoud
authors.initials: M
authors.lastname: Mahmoudian
mesh_terms: D058186:Acute Kidney Injury / Q000201:enzymology* / Q000503:physiopathology; D000704:Analysis of Variance; D000818:Animals; D015415:Biomarkers / Q000032:analysis; D001707:Biopsy, Needle; D002851:Chromatography, High Pressure Liquid; D004195:Disease Models, Animal; D004789:Enzyme Activation / Q000502:physiology; D005839:Gentamicins / Q000633:toxicity; D007150:Immunohistochemistry; D007677:Kidney Function Tests; D007683:Kidney Tubular Necrosis, Acute / Q000201:enzymology / Q000503:physiopathology; D008297:Male; D007703:Peptidyl-Dipeptidase A / Q000032:analysis / Q000378:metabolism*; D011336:Probability; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; D005839:Gentamicins; D007703:Peptidyl-Dipeptidase A