Decrease of bradykinin-induced glomerular contraction in diabetic rat: a new cellular interpretation.

The contractile response to bradykinin (BK), measured by the reduction of the planar surface area, was studied in glomeruli and mesangial cells (MC) isolated from diabetic rats (D) one week after diabetes induction with injection of streptozotocin (STZ; 60 mg kg-1, i.p.).

Monoclonal antibodies to human epidermal filaggrin, some not recognizing profilaggrin.

To improve understanding of human profilaggrin processing to filaggrin, we produced seven monoclonal antibodies against epidermal filaggrin (AHF1-7). They were characterized on human epidermis by indirect immunofluorescence, immunogold labeling, and immunoblotting and found to be directed against seven different epitopes of (pro)filaggrin. AHF1-5 labeled the keratohyalin granules and the fibrous matrix of the lower corneocytes, and recognized filaggrin and profilaggrin.

Immunoblotting detection of so-called 'antikeratin antibodies': a new assay for the diagnosis of rheumatoid arthritis.

Objectives: To assess the diagnostic value for rheumatoid arthritis (RA), of an immunoblotting assay based on the rat oesophagus epithelium antigens recognised by the so-called 'antikeratin antibodies' ('AKA'), antigens that have been identified as three non-cytokeratin proteins (referred to as A, B and C proteins).

Methods: After polyacrylamide gel electrophoresis in non-denaturing conditions and electrotransfer of an epithelial extract, the immunoreactivities to the A, B and C proteins of a series of serum samples from 88 patients with RA and 100 patients with non-rheumatoid rheumatic diseases, were semiquantitatively evaluated.

Results: A total of 81.

Bradykinin-induced in vitro contraction of rat mesangial cells via a B2 receptor type.

The effect of bradykinin (BK) on the contraction of rat mesangial cells (MC) was compared with that of various vasoactive agents. BK induced a dose-dependent contraction [one-half maximal effective dose (ED50) = 50 nM] inhibited by the B2 antagonist, HOE-140 (ED50 = 10 nM). BK-induced MC contraction was independent of extracellular calcium and was reduced by inhibition of protein kinase C (PKC).

Protective effect of cicletanine on hypertension-induced decreases in the renal kallikrein-kinin and prostaglandin systems in stroke-prone spontaneously hypertensive rats.

We investigated the effect of two oral (p.o.) doses of cicletanine (5 and 30 mg/kg/day) for 4 weeks on urinary excretion (UKE), renal concentration (RKC) of kallikrein, and prostaglandin E2 (PGE2) and 6-keto-PGF1 alpha urinary excretion of stroke-prone (SP) spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY) rats submitted to a high sodium intake (1%).

Glomerular B2-kinin-binding sites in two-kidney, one-clip hypertensive rats.

To extend our recent observations of the possible downregulation of glomerular B2-kinin-binding sites, we investigated density (Bmax) of bradykinin (BK)-binding sites in glomerular membranes of both the clipped (C) and nonclipped (NC) kidneys of two-kidney, one-clip (2K-1C) Goldblatt hypertensive rats, in relation to tissue kallikrein activity and glomerular three-dimensional structure. Compared with the Bmax of sham-operated (SO) kidney (31.8 +/- 7 fmol/mg protein), a significant increase in Bmax was observed in glomeruli of both kidneys in hypertensive rats, the Bmax being higher in glomeruli of NC than in C kidneys (98 +/- 11 vs.

Immunohistochemical study of a tubular basement membrane antigen in normal human urinary sediment by a monoclonal antibody.

This preliminary study concerns murine monoclonal antibodies (Mabs) against tubular basement membranes (TBM) of human kidney which were produced by the classical hybridization technique. One of these Mabs (PP8-1) specifically recognized an antigen present in the tubular basement membranes of various portions of tubule and in the Bowman's capsule. By immunocytochemical techniques, this Mab was used to study the presence and the distribution of the related antigen in urinary sediment from 12 normal healthy subjects.

Immunofluorescence characterization of light chains in human nephropathies.

Renal tissue from 185 patients with various nephropathies were studied by immunofluorescence, in order to look for the frequency and potential predominance of kappa or lambda light chain glomerular deposits. Four normal renal biopsies were used as controls. An overall study shows that light chains were present in glomeruli in 136 out of 185 cases; kappa light chain deposits were more frequent than lambda light chain deposits (73.

Immunofluorescence and ultrastructural localization of beta 2-microglobulin in human renal allografts.

The localization of beta 2-microglobulin (beta 2m) was studied in renal biopsies from 18 patients with pathological transplanted kidney using immunofluorescence and electron-immunohistochemical techniques; the renal biopsies of 4 cases with normal kidneys were used as controls. Using immunofluorescence, beta 2m was not observed in the normal kidneys, beta 2m was found in the glomeruli (7 cases) and the tubular epithelium (16 cases) of the transplanted kidneys. Using immunoelectron microscopy, some labelling of the normal kidneys was observed mainly along the cell coat of foot processes and in tubular-epithelial lysosomes.

Immunofluorescence study of "non-idiopathic" renal amyloidosis.

The authors report the results of immunofluorescence (IF) studies of 17 cases of "non-idiopathic" renal biopsy-proven amyloidosis and 18 cases of various nephropathies and normal kidneys (as controls), investigated by IF by simultaneous use of antisera against routine IgG, IgM, IgA, C3, C4, Clq, beta-lipoprotein, albumin, and fibrinogen. Antisera against kappa and lambda light chains and amyloid A and amyloid P components were also used. Six of the 17 cases of amyloidosis were associated with immunocyte dyscrasia, and 11 were cases of reactive systemic amyloidosis associated with chronic infections or inflammatory and neoplastic disorders.

Immunofluorescence study of amyloid P-component patterns in human nephropathies.

The localization of amyloid P-component (AP) staining was studied by immunofluorescence in renal biopsies from 106 patients with various nephropathies and from 3 patients with normal kidneys. Linear staining was observed along the glomerular basement membranes (GBM) of normal kidneys. In amyloidosis, AP was always present in the glomeruli.

Specificity and nephrotoxicity of heterologous antibodies directed against renal basement membranes.

Two immune sera have been raised in sheep against rabbit glomerular and tubular basement membranes, respectively (GBM and TBM). Their specificity was investigated by immunoabsorption and radioimmunoassay, and their nephrotoxicity was studied by injecting them into New Zealand rabbits. Both antisera reacted in vitro collagen and noncollagen-related glycopeptides.

A correlative study of immunofluorescence, electron, and light microscopy in immunologically mediated renal tubular disease in man.

Renal biopsy specimens obtained from patients with various chronic nephropathies were studied by immunofluorescence (IF), electron and light microscopy. Of 49 biopsies studied by IF, 22 had granular deposits of IgG and/or C3 along the basement membranes of proximal tubules while 14 had linear and 13 both linear and granular deposits. The possible importance of immunologically mediated renal tubular lesions in chronic nephropathies is discussed.

Tubular basement membrane deposits in human renal allografts.

In 18 patients who received renal allografts, tubulo-interstitial lesions were studied, according to the types of rejection or the possible recurrence of primary disease. Immunofluorescent (IF) investigation revealed tubular basement membrane (TBM) deposits of IgG and/or C3 and sometimes other components of Complement. The pattern of these deposits was: "linear" in 3 cases, "granular" in 9 cases and "atypical" with linear and granular segments in 6 cases.

[Tubular and glomerular nephropathy induced in rabbits by injection of a heterologous antitubular basement membrane serum].

A nephropathy affecting both tubules and glomeruli has been induced in Rabbits by the injection of an heterologous immune serum directed against Rabbit tubular basement membrane. It differs from experimental antiglomerular basement membrane nephropathy by the fixation of antibodies and C3 on tubular basement membrane and by the occurrence of glucosuria.

[Simultaneous isolation of rabbit glomerular and tubular basement membrane].

A method allowing simultaneous isolation of Rabbit alomerular and tubular basement membranes has been perfected. Rabbit tubular basement membrane has also been obtained by tryptic digestion of the renal cortex. Electron microscopic observation and biochemical analysis show that the contamination of the membrane preparations by cellular components is negligible.