The participation of surviving juxtamedullary nephrons in the adaptive changes of glomerular filtration that occur in response to loss of functioning nephron mass was examined by direct micropuncture of the rat renal papilla. The solitary remnant kidney (RK) in rats with an 85% reduction of renal mass demonstrated strikingly elevated values for single nephron glomerular filtration rate (SNGFR) in both superficial (46.1 +/- 3.2 nl/min) and juxtamedullary (73.5 +/- 6.1 nl/min) nephrons in comparison to respective values observed in normal hydrophenic rats (superficial SNGFR = 15.0 +/- 1.9 nl/min, P less than 0.001, and juxtamedullary SNGFR = 30.2 +/- 3.2 nl/min, P less than 0.001). In RK rats, the proximal portions of both superficial and juxtamedullary nephrons exhibited a marked increase in absolute fluid reabsorption as well as a markedly enhanced delivery of fluid to more distal portions of the nephron. These observations indicate that similar, not preferential, functional adaptations in glomerular filtration occur concomitantly in both superficial and juxtamedullary nephrons consequent to reduction of renal mass.
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