P-Aminohippurate

Uchino, H., et al. p-aminohippuric acid transport at renal apical membrane mediated by human inorganic... 

Yang, I.S., Goldinger, J.M., Flong, S.K. and Taub, M. (1988). Preparation of basolateral membranes that transport p-aminohippurate from primary cultures of rabbit kidney proximal tubule cells. J. Cell. Physicol. 135 481-487. 

The RPF can be calculated using the same formula as the clearance formula but using a substance that is entirely excreted p-aminohippuric acid is usually used. 

Table V contains data for two model substances, p-aminohippurate (PAH) and phenol red. Consideration of the highest values in this table tells you where the major portions of the substances appear. For example, urine and bile show the largest concentrations of PAH and phenol red. Both compounds appear in significant concentrations in the kidney while the values in muscle, brain and cerebrospinal fluid (CSF) are invariably lower than the values seen in plasma. The values in parentheses (Table V) are percent of the administered dose in a given tissue or fluid compartment. They add to the previous information by revealing the overall importance of a particular compartment in the disposition of a substance. For example, while the hepatic concentrations of PAH and phenol red at 4 hrs. are only about 2-fold those of plasma, the large size of the shark liver relative to its body weight, typically about 10%, leads to the appearance of 30-40% of these substances in the liver. The relative handling of these compounds by the urinary and biliary system is obvious from considering the percentage figures. Thus in 24 hours phenol red is about equally distributed in the bile and urine (38 vs 31%) the urinary route is the dominant route of excretion of PAH, i.e., 56 vs 2%.

PAH efflux transport p-Aminohippuric acid ND Isolated retinal capillary [13]... 

Immunohistochemical study ND not determined GLUT1 facilitative glucose transporter MCT1 monocarboxylate transporter CRT creatine transporter LAT1 L-type amino acid transporter TAUT taurine transporter ENT equilibrative nucleoside transporter Oatp organic anion-transporting polypeptide PAH p-aminohippuric acid RUI retinal uptake index TR-iBRB rat retinal capillary endothelial cells. 

H. Shimada, B. Moewes, and G. Burckhardt. Indirect coupling to Na+ of p-aminohippuric acid uptake into rat renal basolateral membrane vesicles. Am J Physiol 253 F795-F801 (1987). 

Renal blood (or plasma) flow (p-aminohippuric acid clearance or ultrasonic transit time flowmetry)... 

Plasma protein-bound drugs that are substrates for transport carriers can be cleared from blood at great velocity, e.g., p-aminohippurate by the renal tubule and sulfobromophthalein by the liver. Clearance rates of these substances can be used to determine renal or hepatic blood flow. 

Certain molecules, such as p-aminohippuric acid (Fig. 3.18), a metabolite of p-aminobenzoic acid are actively transported from the bloodstream into the tubules by a specific anion transport system. Organic anions and cations appear to be transported by separate transport systems located on the proximal convoluted tubule. Active transport is an energy-requiring process and therefore may be inhibited by metabolic inhibitors, and there may be competitive inhibition between endogenous and foreign compounds. For example, the competitive inhibition of the active excretion of uric acid by compounds such as probenecid may precipitate gout. 

The compound damages the pars recta portion of the proximal tubule with the loss of the brush border. The result is renal failure detected as glycosuria, proteinuria, loss of concentrating ability, and reduction in the clearance of inulin, p-aminohippuric acid, and tetraethylammonium ion. 

Different possibilities for conducting enzymatic assays on microchip platforms including pre-, on- or post-column reactions have been reviewed [156]. An enzymatic assay (employing creatininase, creatinase and sarcosine oxidase) has also been developed in a microchip for analysing renal marks such as creatinine and creatine as well as p-aminohippuric acid and uric acid [157]. 

J. Libeer, S. Scharpe, et al., Simultaneous determination of p-aminobenzoic acid and p-aminohippuric acid in serum and urine by capillary gas chromatography with use of a nitrogen-phosphorus detector, Clin. Chim. Acta, 775 119-123 (1981). 

Wedeen RP, Weiner B. The distribution of p-aminohippuric acid in rat kidney slices. I. Tubular localization. Kidney Int 1973 3 205-213. 

Kikuchi R, Kusuhara H, Sugiyama D, et al. Contribution of organic anion transporter 3 (Slc22a8) to the elimination of p-aminohippuric acid and benzylpenicillin across the blood-brain barrier. J Pharmacol Exp Ther 2003 306 51-58. 

Smeets PH, van Auhel RA, Wouterse AC, et al. Contribution of multidrug resistance protein 2 (MRP2/ABCC2) to the renal excretion of p-aminohippurate (PAH) and identification of MRP4 (ABCC4) as a novel PAH transporter. J Am Soc Nephrol 2004 15 2828-2835. 

Nagai J, Takano M, Hirozane K, et al. Specificity of p-aminohippurate transport system in the OK kidney epithelial cell line. J Pharmacol Exp Ther 1995 274 (3) 1161-1166. 

Dan T, Onuma E, Tanaka H, Koga H (1991) A selective uricosuric action of AA-193 in rats. Comparison with its effect on PAH secretion in vivo and in vitro. Naunyn-Schmiedeberg s Arch Pharmacol 343 532-537 Kahn AM, Branham S, Weinman EJ (1983) Mechanism of urate and p-aminohippurate transport in rat microvillus membrane vesicle. Am J Physiol 245 (Renal Fluid Electrolyte Physiol 14) F151-F158... 

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