Gamma delta T lymphocytes in human glomerulonephritis.
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Glomerulonephritis↗
Biomedical subjects
M Joannidis
Publications and source records attributed to M Joannidis.
Renal expression of intercellular adhesion molecule-1 in different forms of glomerulonephritis.
1. Expression of intercellular adhesion molecule-1 was investigated in five normal kidneys and 47 renal biopsies with the use of monoclonal antibody 7F7 and immunoperoxidase staining. 2. In the normal kidney, intercellular adhesion molecule-1 was expressed on endothelial cells of glomerular and peritubular capillaries, on Bowman's capsule, on some interstitial cells and weakly in the mesangium. 3. Increased glomerular staining was detected in early cases of rapidly progressing glomerulonephritis (5/8) and in some cases of non-IgA mesangioproliferative glomerulonephritis (5/9), IgA nephropathy (3/5), Henoch-Schoenlein purpura (2/2), lupus nephritis (5/6) and focal segmental glomerulosclerosis (1/3). A decrease in intercellular adhesion molecule-1 expression was noted in advanced rapidly progressive glomerulonephritis (3/8), two cases of membraneous nephropathy, one severe mesangioproliferative glomerulonephritis biopsy, the two membranoproliferative glomerulonephritis biopsies and in sclerotic loops in focal segmental glomerulosclerosis. 4. Expression de novo on tubular epithelial cells occurred in rapidly progressive glomerulonephritis, in membranoproliferative glomerulonephritis, and to a lesser extent in some cases of membraneous nephropathy, minimal change disease, IgA nephropathy, focal segmental glomerulosclerosis, a severe case of mesangioproliferative glomerulonephritis and in the mixed essential cryoglobulinaemia case. In 63% of positive tubuli, intraluminal cells which expressed CD18, the common beta-chain of leucocyte-function-associated antigen-1, Mac-1 and p150,95, were present. 5. Intercellular adhesion molecule-1 was also found on the majority (59%) of infiltrating mononuclear cells in all forms of glomerulonephritis.
Antibodies, Monoclonal↗
Recurrent abdominal pain caused by a toothpick in a CAPD patient.
A 27-year-old patient on CAPD presented with febrile illness and abdominal pain suggestive of peritonitis. Dialysis fluid culture yielded Enterococcus. Response to treatment was slow, with pain persisting. Laparotomy revealed a toothpick, which was causing peritoneal irritation. It was unclear how the foreign object entered the peritoneum.
Abdominal Pain↗
CAPD: a successful treatment in patients suffering from therapy-resistant congestive heart failure.
During the last six years 13 patients suffering from congestive heart failure (CHF), refractory to conventional medical treatment and classified class IV as defined by the New York Heart Association (NYHA), were treated with continuous ambulatory peritoneal dialysis (CAPD) (1) at Innsbruck University Hospital, Department of Internal Medicine. All patients required intensive care and were end-stage. The minimum observation period was six weeks, maximum 67 months. Cardiac recompensation was effected in all patients, who were stabilized in class II after NYHA. The patient with the shortest observation period of six weeks received an orthotopic heart transplant. None of the patients died of a CAPD-associated complication. All patients were restored to a normal life style without major dependence on outside help. The occurrence and treatment of the prerenal kidney failure that causes life-threatening problems in end-stage CHF should be subject to further study with regard to its clinical course and the determination of plasma-ANF, plasma-renin and plasma-aldosterone concentration.
Aldosterone↗
Xanthine oxidase: evidence against a causative role in renal reperfusion injury.
The conversion rates of xanthine dehydrogenase (XDH) to xanthine oxidase (XO) were compared with the time course of in vivo lipid peroxidation (LPO) in an ischemia-reperfusion model of acute renal failure in the rat. LPO, measured as the renal release of malondialdehyde (MDA), was found to be markedly elevated only during the first 5 min of blood reflow following a 45-min interval of ischemia (arteriovenous MDA difference -277.3 +/- 53.5 vs. 3.7 +/- 5.7 nmol/l in controls, n = 14). After 30 min of reperfusion, arteriovenous MDA differences nearly reached control values (9.7 +/- 31.8 nmol/l, n = 7). In contrast to enhanced LPO, no significant conversion of XDH to XO was found (XO activity in controls: 23 +/- 1% of XO plus XDH activity vs. 26 +/- 3% after 45 min of ischemia, n = 7). Therefore XO-derived superoxide anion radicals cannot be considered causative for LPO in the reperfusion interval of experimental ischemic acute renal failure.
Animals↗
Lipid peroxidation--an initial event in experimental acute renal failure.
A method was developed to monitor the occurrence of lipid peroxidation (LPO) during ischemia and Na-maleate-induced acute renal failure (ARF) on male rats in vivo by measuring malondialdehyde (MDA) levels in arterial and renal venous blood and in urine. No signs of LPO could be detected under control conditions. In ischemic ARF produced by 45 min of renal artery clamping a steep increase of MDA was found in the renal venous effluent immediately after starting reperfusion. This effect was nearly abolished after 5 min of blood reflow while glomerular filtration remained at 5% of control value during a 90-min postischemic observation period. Intoxication with Na-maleate leads to enhanced LPO in combination with an impaired renal function 2 h after administration. These findings would well explain cellular damage and some aspects of renal dysfunction associated with the initiation phase of ARF.
Acute Kidney Injury↗
Quantitative morphologic changes in nephron structures and urinary enzyme activity pattern in sodium-maleate-induced renal injury.
The morphologic changes in sodium-maleate-induced acute renal injury in the rat were quantified by a stereologic analysis. The major changes were confined to an increase in endocytic vacuoles and a decrease in mitochondrial inner membrane surface area. These results were found to be linked to significantly increased urinary activities of the cytosolic of the cytosolic enzymes fructose-1,6-bisphosphatase (FBP) and lactate dehydrogenase, the lysosomal enzyme N-acetyl-beta-glucosaminidase (NAG) and the NAD-dependent mitochondrial isocitrate dehydrogenase (ICDH). The highest increase was found for NAG, followed by FBP and ICDH.
Animals↗
Volume-regulatory potassium release from isolated perfused rat kidney.
The present study has been performed to test for cell volume regulatory potassium release from the isolated perfused rat kidney exposed to hypotonic perfusate and for its sensitivity to potassium channel blocker barium and calcium channel blocker verapamil. Replacement of 25 mmol/l NaCl with 50 mmol/l mannitol has little effect on effluent potassium activity, whereas subsequent omission of mannitol from the perfusate leads to a transient increase of effluent potassium activity, reflecting volume regulatory potassium release. Barium (1 mmol/l) leads to a marked transient decrease of effluent potassium activity, pointing to net cellular uptake of potassium. Verapamil (1 mumol/l) leads to a slight decrease of effluent potassium activity. Both barium and verapamil virtually abolish the rapid, transient increase of effluent potassium activity upon exposure to hypotonic perfusates. Thus, the substances either block or markedly retard volume regulatory potassium release. The apparent renal vascular resistance is transiently increased by exposure to hypotonic perfusates and by barium, but is reduced by verapamil. Cell volume regulation of isolated perfused mouse straight proximal tubules is retarded but not abolished by verapamil (0.1 mmol/l). In conclusion, cellular potassium release from rat kidney can be determined by continuous measurement of effluent potassium activity. The volume regulatory potassium release and cell volume regulation are impaired by both barium and verapamil. The persisting cell volume regulation could be due either to slow potassium release and/or some mechanism independent of potassium.
Animals↗
Morphological and biochemical changes of LLC-PK1 cells during adaptation to glucose-free culture conditions.
The established renal epithelial cell line LLC-PK1 retained in tissue culture several differentiated properties of renal proximal tubular cells. By adapting LLC-PK1 cells to glucose-free culture conditions, we recently succeeded in isolating a gluconeogenic strain of LLC-PK1 cells capable of growing in the absence of hexoses. In contrast to the parental wild type, the isolated strain expressed fructose-1,6-bisphosphatase activity and was, therefore, designated LLC-PK1-FBPase+. Besides the differences in glucose metabolism, the isolated gluconeogenic substrain differs form the parental wild type with respect to morphological appearance and the expression of apical membrane marker enzymes. LLC-PK1-FBPase+ cells display a drastic accumulation of autophagic vacuoles, disappearance of apical membrane alkaline phosphatase activity, and increased gamma-glutamyltranspeptidase activity. In order to find out whether or not a low alkaline phosphatase activity in combination with the enhanced formation of autophagic vacuoles is related to a change in apical membrane surface, we utilized a combined light and electron microscopic morphometric procedure to determine the absolute amount of organelle volumes and membrane surface areas. This stereologic approach shows that LLC-PK1-FBPase+ cells display a tenfold increase in the volume of autophagic vacuoles and the lysosomal compartment. Analysis of lysosomal enzyme activities, however, revealed no changes as compared to wild-type cells. The apical membrane surface of gluconeogenic cells was found to be increased by 80%. Karyotype analysis revealed that LLC-PK1 wild-type cells were diploid, whereas FBPase+ cells exhibited polyploidy with a high percentage of tetraploid nuclei. Culturing LLC-PK1-FBPase+ cells in the presence of 5 mM glucose does not abolish the morphological and biochemical changes described, indicating the stability of the FBPase+ strain.
Adaptation, Physiological↗