scholarly journals Renal transport kinetics of furosemide in the isolated perfused rat kidney

1986 ◽  
Vol 14 (2) ◽  
pp. 157-174 ◽  
Author(s):  
Ling-Jar Lee ◽  
Jack A. Cook ◽  
David E. Smith
Keyword(s):  
Rat Kidney ◽  
Transport Kinetics ◽  
Renal Transport ◽  
Isolated Perfused Rat Kidney ◽  
Perfused Rat Kidney ◽  
Kinetics Of

scholarly journals Effects of Organic Anion, Organic Cation, and Dipeptide Transport Inhibitors on Cefdinir in the Isolated Perfused Rat Kidney

2003 ◽  
Vol 47 (2) ◽  
pp. 689-696 ◽  
Author(s):  
Christopher S. Lepsy ◽  
Robert J. Guttendorf ◽  
Alan R. Kugler ◽  
David E. Smith
Keyword(s):  
Organic Cation ◽  
Rat Kidney ◽  
Organic Anion ◽  
Renal Elimination ◽  
Renal Transport ◽  
Transport Mechanisms ◽  
Isolated Perfused Rat Kidney ◽  
Perfused Rat Kidney ◽  
Transport Inhibitors ◽  
Dipeptide Transport

ABSTRACT Cefdinir (Omnicef; Abbott Laboratories) is a cephalosporin antibiotic primarily eliminated by the kidney. Nonlinear renal elimination of cefdinir has been previously reported. Cefdinir renal transport mechanisms were studied in the erythrocyte-free isolated perfused rat kidney. Studies were performed with drug-free perfusate and perfusate containing cefdinir alone to establish the baseline physiology and investigate cefdinir renal elimination characteristics. To investigate cefdinir renal transport mechanisms, inhibition studies were conducted by coperfusing cefdinir with inhibitors of the renal organic anion (probenecid), organic cation (tetraethylammonium), or dipeptide (glycylsarcosine) transport system. Cefdinir concentrations in biological samples were determined using reversed-phase high-performance liquid chromatography. Differences between treatments and controls were evaluated using analysis of variance and Dunnett's test. The excretion ratio (ER; the renal clearance corrected for the fraction unbound and glomerular filtration rate) for cefdinir was 5.94, a value indicating net renal tubular secretion. Anionic, cationic, and dipeptide transport inhibitors all significantly affected the cefdinir ER. With probenecid, the ER was reduced to 0.59, clearly demonstrating a significant reabsorptive component to cefdinir renal disposition. This finding was confirmed by glycylsarcosine studies, in which the ER was elevated to 7.95, indicating that reabsorption was mediated, at least in part, by the dipeptide transporter system. The effects of the organic cation tetraethylammonium, in which the ER was elevated to 7.53, were likely secondary in nature. The anionic secretory pathway was found to be the predominant mechanism for cefdinir renal excretion.

Tubular reabsorption rates for myoglobin in the isolated perfused rat kidney

1986 ◽  
Vol 70 (6) ◽  
pp. 595-599 ◽  
Author(s):  
P. J. Ratcliffe ◽  
M. P. Esnouf ◽  
J. G. G. Ledingham
Keyword(s):  
Rat Kidney ◽  
Tubular Reabsorption ◽  
Renal Tubules ◽  
Immunoglobulin Light Chain ◽  
Renal Handling ◽  
Water Excretion ◽  
Isolated Perfused Rat Kidney ◽  
Saturation Kinetics ◽  
Perfused Rat Kidney ◽  
Kinetics Of

1. The renal handling of myoglobin has been studied in the isolated perfused rat kidney. 2. Myoglobin was freely filtered. Reabsorption by the renal tubules showed saturation kinetics with a relatively low maximum rate of reabsorption (Tmax) of 27-30 μg min−1 g−1 wet wt. at a perfusate concentration of 70-80 μg/ml. Myoglobin reabsorption is therefore much less than that reported for immunoglobulin light chain or lysozyme in this model. 3. Large increases in sodium and water excretion produced by omission of oncotic agent from the perfusate did not alter the kinetics of myoglobin reabsorption. 4. The use of bovine serum albumin as oncotic agent in the perfusate prevented the tubular reabsorption of myoglobin. Small amounts of albumin are filtered by the isolated perfused kidney and it is postulated that this albumin interferes with tubular reabsorption of myoglobin.

Validation of a toxicity testing model by evaluating oxygen supply and energy state in the isolated perfused rat kidney

1991 ◽  
Vol 25 (3) ◽  
pp. 195-204 ◽  
Author(s):  
Takano Takehito ◽  
Nakata Kazuyo ◽  
Kawakami Tsuyoshi ◽  
Miyazaki Yoshifumi ◽  
Murakami Masataka ◽  
...  
Keyword(s):  
Oxygen Supply ◽  
Energy State ◽  
Rat Kidney ◽  
Toxicity Testing ◽  
Testing Model ◽  
Isolated Perfused Rat Kidney ◽  
Perfused Rat Kidney

Aldosterone Effects on Renal Function in the Isolated Perfused Rat Kidney

1979 ◽  
Vol 2 (1) ◽  
pp. 1-11
Author(s):  
Richard Solomon ◽  
Patricio Silva ◽  
Franklin H. Epstein
Keyword(s):  
Renal Function ◽  
Rat Kidney ◽  
Isolated Perfused Rat Kidney ◽  
Perfused Rat Kidney

EFFECTS OF CYCLOSPORINE ON THE ISOLATED PERFUSED RAT KIDNEY

1987 ◽  
Vol 43 (6) ◽  
pp. 795-799 ◽  
Author(s):  
David R. Luke ◽  
Bertram L. Kasiske ◽  
Gary R. Matzke ◽  
Walid M. Awni ◽  
William F. Keane
Keyword(s):  
Rat Kidney ◽  
Isolated Perfused Rat Kidney ◽  
Perfused Rat Kidney
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