scholarly journals Tubular absorption of filtered cystatin-C in the rat kidney

2004 ◽  
Vol 89 (6) ◽  
pp. 701-707 ◽  
Author(s):  
Anca Beatrice Roald ◽  
Knut Aukland ◽  
Olav Tenstad
Keyword(s):  
Cystatin C ◽  
Rat Kidney ◽  
Tubular Absorption

Effects of intraluminal D-glucose and probenecid on urate absorption in the rat proximal tubule

1979 ◽  
Vol 236 (6) ◽  
pp. F526-F529 ◽  
Author(s):  
T. F. Knight ◽  
H. O. Senekjian ◽  
S. Sansom ◽  
E. J. Weinman
Keyword(s):  
Proximal Tubule ◽  
Water Absorption ◽  
Rat Kidney ◽  
Proximal Convoluted Tubule ◽  
Perfusion Solution ◽  
Hexose Sugars ◽  
Tubular Absorption ◽  
Rat Proximal Tubule ◽  
Fractional Absorption

The in vivo microperfusion technique was employed to examine urate absorption in the proximal convoluted tubule of the rat kidney using [2–14C]urate as the marker for fractional urate absorption. With NaCl as the perfusion solution, water absorption averaged 2.53 +/- 0.16 nl.min-1.mm tubule-1, and the fractional absorption of [2–14C]urate averages 11.6 +/- 1.0%/mm tubule. The addition of D-glucose (50 mg/100 ml) enhanced water absorption to 3.62 +/- 0.19 nl.min-1.mm tubule-1, but inhibited fractional urate absorption to 6.6 +/- 1.2%/mm tubule. Phloridzin (4.4 mg/100 ml), 2-deoxy-D-glucose (45.6 mg/100 ml), and 3-O-methyl-D-glucose (53.9 mg/100 ml) also inhibited the absorption of [2–14C]urate to the same degree as did D-glucose despite differing effects on water absorption. The addition of probenecid (2.8 mg/100 ml) to the NaCl perfusion solution had no effect on water absorption but inhibited [2–14C]urate absorption to 6.4 +/- 0.6%/mm tubule. The addition of both probenecid and phloridzin further reduced [2–14C-A1urate absorption to 3.8 +/- 0.7%/mm tubule. Probenecid alone had no effect on glucose transport. These studies suggest that the presence of either certain hexose sugars, phloridzin, or probenecid in the lumen of the proximal convoluted tubule inhibits the tubular absorption of urate.

Removal and excretion of immunoreactive rat growth hormone by the isolated kidney

1981 ◽  
Vol 240 (4) ◽  
pp. F282-F287
Author(s):  
R. Rabkin ◽  
T. I. Gottheiner ◽  
V. S. Fang
Keyword(s):  
Growth Hormone ◽  
Glomerular Filtration ◽  
Filtration Rate ◽  
Rat Kidney ◽  
Renal Circulation ◽  
Isolated Kidney ◽  
Perfused Rat Kidney ◽  
Rat Growth ◽  
Tubular Absorption ◽  
Organ Clearance

The renal uptake of immunoreactive rat growth hormone (rGH), molecular weight 21,500 daltons, was examined in the isolated perfused rat kidney to determine whether peritubular removal of a protein greater than 12,000 daltons occurs and to assess the functional characteristics of renal GH uptake. Organ clearance of rGH (OCGH) in control kidneys was 1,039 +/- 99 microliters/min and was unaffected by an excess of insulin but markedly depressed by col (10 degrees C( and KCN. Although glomerular filtration rate (GFR) did not differ significantly from OCGH in the control rats, we suspected that filtration could not account for all the rGH removed because of glomerular protein sieving. However, GFR was significantly less than OCGH with cold and KCN treatment, indicating the occurrence of peritubular removal. In nonfiltering kidneys, rGH removal exceeded that of [14C]inulin (P less than 0.05), demonstrating peritubular rGH removal. Tubular absorption of rGH was unaffected by insulin but markedly depressed by cold and KCN. We conclude that rGH is removed from the renal circulation mainly by the glomerular filtration-tubular absorptive pathway, but, in addition, as with smaller proteins, that peritubular removal occurs.

Localization of tubular uptake segment of filtered Cystatin C and Aprotinin in the rat kidney

2006 ◽  
Vol 186 (3) ◽  
pp. 209-221 ◽  
Author(s):  
D. Baran ◽  
O. Tenstad ◽  
K. Aukland
Keyword(s):  
Cystatin C ◽  
Rat Kidney

Kinetics, competition, and selectivity of tubular absorption of proteins

1982 ◽  
Vol 243 (4) ◽  
pp. F379-F392 ◽  
Author(s):  
B. E. Sumpio ◽  
T. Maack
Keyword(s):  
Rat Kidney ◽  
High Capacity ◽  
Human Growth ◽  
Protein Molecule ◽  
Structural Features ◽  
Cyt C ◽  
Tubular Absorption ◽  
Beta 2 ◽  
Beta 2 Microglobulin ◽  
Endocytic Vesicles

Tubular absorption (T) of two cationic proteins, lysozyme (LZM) and cytochrome c (CYT c), and two anionic proteins, beta 2-microglobulin (beta 2M) and 125I-labeled human growth hormone (hGH), was studied in the isolated perfused rat kidney. All four proteins are extensively filtered and, at low loads, almost completely absorbed by the tubular epithelium. TLZM and TCYT c is a saturable process of high capacity (Tm) and low apparent affinity. (Tm)LZM was two orders of magnitude larger than (Tm)CYT c. LZM inhibited TCYT c in a dose-dependent and reversible manner. Saturating loads of CYT c failed to inhibit T beta 2M and ThGH. Saturation, selectivity, and competition is explained on the basis of a model that incorporates adsorption of protein to microvilli as well as geometric and electrical constraints on the access of filtered proteins to endocytic sites at the base of the microvilli. Tubular absorption of all proteins is decreased by inhibitors of the formation and/or internalization of endocytic vesicles (iodoacetate and cytochalasin B). However, lysine (5 mM) and low perfusate calcium concentration (0.5 mM) inhibited T beta 2M but not TCYT c and ThGH. The selective effect of 5 mM lysine, which causes morphologic damage in initial portions of the proximal convoluted tubule, may be due to preferential or exclusive absorption of beta 2 M in this portion of the nephron. The results as a whole demonstrate that in addition to net charge other structural features of the protein molecule and of the luminal wall of proximal tubules may be important determinants of the efficiency and capacity of the tubular absorption of filtered proteins.

The Effects of Chronic Low Dose Exposure of Chlorpyrifos on the Rat Kidney

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Aung S ◽  
Norlelawati AT ◽  
Nor Zamzila A ◽  
Zamzuria MZ ◽  
Norra H ◽  
...  
Keyword(s):  
Uric Acid ◽  
Cystatin C ◽  
Low Dose ◽  
Rat Kidney ◽  
Control Group ◽  
Sprague Dawley ◽  
Glomerular Function ◽  
Tubular Necrosis ◽  
Sprague Dawley Rats ◽  
Renal Tubular

Introduction: An increased incidence of chronic kidney disease (CKD) was reported among agricultural workers who were exposed to organophosphates (OP). There is little information on the effects of chronic low OP exposure on kidney in experimental animals. Chlorpyrifos (CPF) is a common type of OP used in agriculture. Thus, the aim of this study was to assess the effects of chronic low subcutaneous exposure of CPF on the kidney. Methods. Eighteen male Sprague Dawley rats were divided into three groups, with six rats in each group. Group 1 served as a control group, and groups 2 and 3 received a subcutaneous vehicle (3% dimethyl sulfoxide + 97% v/v soy oil) or CPF (18.0 mg/kg) respectively, every other day for 180 days. Serum urea, creatinine, uric acid, cystatin C, electrolyte levels, acetylcholinesterase (AChE), and arylesterase (ArE) activities were measured. Histopathological changes in the kidney tissues were examined. Results. Urea, creatinine, uric acid, and cystatin C levels were significantly increased (p < 0.05), while electrolytes were reduced (p < 0.05) in the CPF-treated rats. Both AChE and ArE activities were depressed in the CPF group (p < 0.01 and p < 0.001, respectively). Diffuse necrosis of proximal tubules and glomerular hypercellularity were observed in the kidney in the CPF group. Conclusion. A chronic low dose of CPF via subcutaneous exposure caused considerable renal tubular necrosis and derangement of glomerular function. These findings suggest that chronic occupational OPs exposure can cause kidney damage.

scholarly journals MECHANISM OF PROTEINURIA

1951 ◽  
Vol 93 (4) ◽  
pp. 325-336 ◽  
Author(s):  
Richard W. Lippman ◽  
Helen J. Ureen ◽  
Jean Oliver
Keyword(s):  
Rat Kidney ◽  
Intraperitoneal Administration ◽  
Egg White ◽  
Absorption Mechanism ◽  
Glomerular Permeability ◽  
Bovine Albumin ◽  
Tubular Absorption

Intraperitoneal administration of bovine albumin sharply increases glomerular permeability to hemoglobin in the rat kidney. In addition, bovine albumin "saturates" the tubular absorption mechanism and inhibits the tubular absorption of subsequently administered hemoglobin. Egg white, ovalbumin, and ovomucoid, in contrast, do not produce significant changes in glomerular permeability to hemoglobin or in the tubular absorption of hemoglobin. These effects have been demonstrated both by physiologic measurements and by the morphologic demonstration of the absorbed proteins.

The Morphology of the Rat Kidney Following Folic Acid Administration

1970 ◽  
Vol 28 ◽  
pp. 200-201
Author(s):  
Aline Byrnes ◽  
Elsa E. Ramos ◽  
Minoru Suzuki ◽  
E.D. Mayfield
Keyword(s):  
Folic Acid ◽  
De Novo ◽  
Specific Activity ◽  
Rat Kidney ◽  
Present Report ◽  
Intracellular Localization ◽  
Male Rats ◽  
Renal Hypertrophy ◽  
Electron Microscopic ◽  
Biochemical Alterations

Renal hypertrophy was induced in 100 g male rats by the injection of 250 mg folic acid (FA) dissolved in 0.3 M NaHCO3/kg body weight (i.v.). Preliminary studies of the biochemical alterations in ribonucleic acid (RNA) metabolism of the renal tissue have been reported recently (1). They are: RNA content and concentration, orotic acid-c14 incorporation into RNA and acid soluble nucleotide pool, intracellular localization of the newly synthesized RNA, and the specific activity of enzymes of the de novo pyrimidine biosynthesis pathway. The present report describes the light and electron microscopic observations in these animals. For light microscopy, kidney slices were fixed in formalin, embedded, sectioned, and stained with H & E and PAS.

Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

1977 ◽  
Vol 35 ◽  
pp. 388-389
Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg
Keyword(s):  
Surface Properties ◽  
Ricinus Communis ◽  
Rat Kidney ◽  
Leukemia Virus ◽  
Viral Envelope ◽  
Virus Particles ◽  
Chemically Induced ◽  
Sarcoma Virus ◽  
Hepatocarcinoma Cells ◽  
Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

The Fine Structure of Rat Renal Microbodies and Cytoplasmic Bodies Following Perfusion Fixation

1973 ◽  
Vol 31 ◽  
pp. 620-621
Author(s):  
J. M. Barrett ◽  
P. M. Heidger
Keyword(s):  
Fine Structure ◽  
Proximal Tubule ◽  
Rat Kidney ◽  
Renal Proximal Tubule ◽  
Convincing Evidence ◽  
Cytoplasmic Bodies ◽  
Rat Renal Proximal Tubule ◽  
Renal Proximal Tubule Cells ◽  
Perfusion Fixation

Microbodies have received extensive morphological and cytochemical investigation since they were first described by Rhodin in 1954. To our knowledge, however, all investigations of microbodies and cytoplasmic bodies of rat renal proximal tubule cells have employed immersion fixation. Tisher, et al. have shown convincing evidence of fine structural alteration of microbodies in rhesus monkey kidney following immersion fixation; these alterations were not encountered when in vivo intravascular perfusion was employed. In view of these studies, and the fact that techniques for perfusion fixation have been established specifically for the rat kidney by Maunsbach, it seemed desirable to employ perfusion fixation to study the fine structure and distribution of microbodies and cytoplasmic bodies within the rat renal proximal tubule.

Electron microscopic study of the membrane glycoproteins in the rat kidney after cisplatin treatment

1989 ◽  
Vol 47 ◽  
pp. 912-913
Author(s):  
S.K. Aggarwal
Keyword(s):  
Alkaline Phosphatase ◽  
Rat Kidney ◽  
Light And Electron Microscopy ◽  
Kidney Tissue ◽  
Membrane Glycoproteins ◽  
Electron Microscopic ◽  
Before And After ◽  
Interstrand Cross Links ◽  
Cross Links

The proposed primary mechanism of action of the anticancer drug cisplatin (Cis-DDP) is through its interaction with DNA, mostly through DNA intrastrand cross-links or DNA interstrand cross-links. DNA repair mechanisms can circumvent this arrest thus permitting replication and transcription to proceed. Various membrane transport enzymes have also been demonstrated to be effected by cisplatin. Glycoprotein alkaline phosphatase was looked at in the proximal tubule cells before and after cisplatin both in vivo and in vitro for its inactivation or its removal from the membrane using light and electron microscopy.Outbred male Swiss Webster (Crl: (WI) BR) rats weighing 150-250g were given ip injections of cisplatin (7mg/kg). Animals were killed on day 3 and day 5. Thick slices (20-50.um) of kidney tissue from treated and untreated animals were fixed in 1% buffered glutaraldehyde and 1% formaldehyde (0.05 M cacodylate buffer, pH 7.3) for 30 min at 4°C. Alkaline phosphatase activity and carbohydrates were demonstrated according to methods described earlier.

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