TY - JOUR
T1 - Anemia lessens and its prevention with recombinant human erythropoietin worsens glomerular injury and hypertension in rats with reduced renal mass
AU - Garcia, D. L.
AU - Anderson, S.
AU - Rennke, H. G.
AU - Brenner, B. M.
PY - 1988
Y1 - 1988
N2 - Chronic renal disease is frequently characterized by anemia, which may modify systemic and renal hemodynamics. In adult Munich-Wistar rats, the mild anemia (hematocrit, ~42 vol/dl) that accompanies five-sixths nephrectomy was either made more severe (~30 vol/dl) by feeding a low iron diet or prevented (~50 vol/dl) by administration of recombinant human erythropoietin (r-HuEpo). In functional studies performed 4 weeks after renal ablation, untreated rats exhibited mild anemia with systemic hypertension and elevation of the single nephron glomerular filtration rate due to glomerular capillary hyperperfusion and hypertension. Preventing anemia with r-HuEpo worsened systemic and glomerular hypertension, effects largely obviated by induction of more marked anemia with the low iron diet. Untreated rats followed for 6 weeks postablation exhibited progressive proteinuria and sclerosis involving 12% of glomeruli, contrasted with 33% in rats given r-HuEpo. Even after 12 weeks, sclerosis involved only 6% of glomeruli in rats with more severe anemia but progressed to 30% in untreated rats. Thus, anemia limits systemic and glomerular hypertension and glomerular injury, whereas its prevention by r-HuEpo severely accelerates hemodynamically mediated glomerular injury in this model. These results suggest that anemia is a hemodynamically favorable adaptation to chronic renal disease and that its overly vigorous correction may have adverse renal hemodynamic and structural consequences.
AB - Chronic renal disease is frequently characterized by anemia, which may modify systemic and renal hemodynamics. In adult Munich-Wistar rats, the mild anemia (hematocrit, ~42 vol/dl) that accompanies five-sixths nephrectomy was either made more severe (~30 vol/dl) by feeding a low iron diet or prevented (~50 vol/dl) by administration of recombinant human erythropoietin (r-HuEpo). In functional studies performed 4 weeks after renal ablation, untreated rats exhibited mild anemia with systemic hypertension and elevation of the single nephron glomerular filtration rate due to glomerular capillary hyperperfusion and hypertension. Preventing anemia with r-HuEpo worsened systemic and glomerular hypertension, effects largely obviated by induction of more marked anemia with the low iron diet. Untreated rats followed for 6 weeks postablation exhibited progressive proteinuria and sclerosis involving 12% of glomeruli, contrasted with 33% in rats given r-HuEpo. Even after 12 weeks, sclerosis involved only 6% of glomeruli in rats with more severe anemia but progressed to 30% in untreated rats. Thus, anemia limits systemic and glomerular hypertension and glomerular injury, whereas its prevention by r-HuEpo severely accelerates hemodynamically mediated glomerular injury in this model. These results suggest that anemia is a hemodynamically favorable adaptation to chronic renal disease and that its overly vigorous correction may have adverse renal hemodynamic and structural consequences.
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U2 - 10.1073/pnas.85.16.6142
DO - 10.1073/pnas.85.16.6142
M3 - Article
C2 - 3413082
AN - SCOPUS:0000313513
SN - 0027-8424
VL - 85
SP - 6142
EP - 6146
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 16
ER -