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THE PATHOGENESIS OF THE RENAL INJURY PRODUCED IN THE DOG BY HEMOGLOBIN OR METHEMOGLOBIN
H E Harrison1, H Bunting, N K Ordway
1Department of Pathology, Yale University School of Medicine, New Haven.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Intravascular hemolysis from arsine or hemoglobin injections impairs kidney function in dogs. Gel-like methemoglobin obstructs tubules, causing reduced urine flow and severe renal injury.
Area of Science:
- Nephrology
- Toxicology
- Histopathology
Background:
- Intravascular hemolysis can lead to acute kidney injury.
- Hemoglobin and its derivatives are implicated in renal pathology.
Purpose of the Study:
- To investigate the pathogenesis of renal injury induced by intravascular hemolysis and hemoglobin/methemoglobin administration in dogs.
- To elucidate the mechanisms behind impaired kidney function following exposure to arsine, hemoglobin, and methemoglobin.
Main Methods:
- Induction of intravascular hemolysis and administration of hemoglobin/methemoglobin solutions in dogs.
- Histological examination of renal tissues using standard and ferrocyanide histochemical methods.
- Assessment of urine flow, tubule obstruction, and cell necrosis.
Main Results:
- Tubular obstruction by viscous methemoglobin solutions was a key factor in early kidney dysfunction.
- Methemoglobin caused more severe renal injury than oxyhemoglobin.
- Proximal tubule cell necrosis and collapsed, hemosiderin-laden tubules indicated persistent renal damage and non-functioning nephrons.
Conclusions:
- Tubular obstruction by methemoglobin is a primary cause of acute kidney injury in this model.
- Cellular necrosis and nephron loss contribute to persistent renal dysfunction.
- Renal blood flow was not significantly reduced, suggesting intrarenal factors are dominant in the observed injury.
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