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Biomedical subjects

H Kamitsuji

Publications and source records attributed to H Kamitsuji.

33 records · Page 2Linked to original sources
PubMed1988

Glomerular and vascular lesions in DOCA-salt hypertension: the role of anticoagulation.

The aim of the present experiments was to determine if anticoagulant and antithrombotic drugs, which protect against hypertension and vascular damage in some models of hypertension, have a similar effect in DOCA-salt hypertension. Unilaterally nephrectomized rats received injections of deoxycorticosterone acetate (DOCA) and 1% saline to drink and were treated with either heparin, defibrotide, low molecular weight (LMW) heparin or vehicle (control) for five and a half weeks. At sacrifice heparin treated rats had decreased hematocrit (p less than 0.001) and prolonged APTT (p less than 0.001). LMW heparin and defibrotide groups did not differ from control animals in either hematocrit or APTT. The systolic blood pressure (SBP) of heparin treated rats at sacrifice was lower than control (p less than 0.05) but, there were no other differences in SBP throughout the course of the experiment. Renal morphology revealed a lower number of glomerular epithelial cell droplets in the heparin group (p less than 0.01) only. Vascular damage did not differ significantly between groups.

Animals↗
PubMed1988

Intraglomerular deposition of fibrin/fibrinogen-related antigen in children with various renal diseases.

The localization of intraglomerular deposits of fibrin (Fb)/fibrinogen (Fg)-related antigen (FRA) in children with various glomerular diseases was determined by an immunohistopathologic method using an anti-Fg antibody capable of detecting FRA, an anti-D-dimer antibody capable of detecting crosslinked Fb (XLFb) and its derivatives (XLFbDP), and by a method using the effect of monochloroacetic acid (MCA) treatment on kidney sections. In proliferative glomerulonephritis (PGN), XLFbs were detected within the capillaries and extension beyond the mesangium was seen in severe PGN. The FRA within the mesangium of minimal or mild PGN was composed of the non-XLFb substance. The FRA within Bowman's space of most PGN had disappeared after MCA treatment, suggesting a non-XLFb substance. The presence of FRA within electron-dense deposits (EDD) suggested that FRA deposits are associated with immune-complex deposits in the glomeruli.

Acetates↗
PubMed1988

Urinary cross-linked fibrin degradation products in glomerular disease with crescents.

The concentration of cross-linked fibrin degradation products (XLFDP) in urine were determined by enzyme-linked immunosorbent assay (ELISA) or radioimmunoassay (RIA) in patients with several types of glomerulonephritis with crescents (CrGN). In patients with "active" cellular crescents, increased levels of XLFDP correlated with the percentage of glomeruli containing crescents. Dysmorphic erythrocytes, suggestive of glomerular bleeding, were observed in all of the patients with CrGN, and the urinary red cell counts (URCC) also correlated with percentage of glomeruli containing crescents. The absence of correlation between urinary XLFDP and URCC or urinary protein suggested that lysis of fibrin within crescents may contribute to the urinary excretion of XLFDP in CrGN. The measurement of urinary XLFDP in CrGN is likely to be of value in assessing the activity of glomerular lesions but not renal function.

Adolescent↗
PubMed1987

Activity of blood coagulation factor XIII as a prognostic indicator in patients with Henoch-Schönlein purpura. Efficacy of factor XIII substitution.

UNLABELLED: Determination of coagulation Factor XIII (F XIII)-related parameters in 21 patients with Henoch-Schönlein purpura documented a significant decrease of F XIII activity as well as of the F XIII-related antigenic determinants. Subgroup analysis with regard to the clinical symptoms showed an even further decrease of these parameters in patients with gastrointestinal complications. Stimulated by these findings a substitution therapy with a F XIII concentrate was initiated in those patients whose F XIII activity in plasma remained low and who developed severe abdominal pain accompanied by persisting gastrointestinal bleeding. This therapeutic approach not only corrected the laboratory data, but more important led to a cessation of pain and bleeding. A rapid decrease of F XIII levels after transfusion below 40 U/ml was indicative of relapse of abdominal symptoms, while increasing values were associated with the recovery of the patients. IN CONCLUSION: F XIII activity determinations appear to have a predictive value in patients with Henoch-Schönlein purpura, and the administration of F XIII concentrates may contribute to the improvement of gastrointestinal complications.

Child↗
PubMed1987

Immunoelectron microscopic study of glomerular lesions using a postembedding method with a protein A-gold complex.

Renal biopsy tissue from 33 children with various glomerular diseases has been investigated by electron microscopy using a postembedding immunostaining technique with a protein A-gold complex in order to establish more precise correlations between immunopathologic and morphologic findings in glomeruli. This technique could detect immunoglobulins (IgG, IgA, and IgM), complement factor (C3c), and fibrinogen-related antigen. The immunoreactivity of these antigens was essentially confined to the mesangial, paramesangial, subendothelial, and subepithelial 'electron-dense deposits' in the glomeruli. Except for IgM and C3c in the case of glomerular sclerosis, the distribution of the mentioned factors was even in the electron-dense deposits, as could be shown by 'double-immunolabeling'. From the above-mentioned findings one can conclude that several of the localized factors are associated with the formation of electron-dense deposits, the ultrastructural hallmarks of glomerular disease.

Antigens↗
PubMed1986

Urinary crosslinked fibrin degradation products in glomerular disease.

Urinary levels of crosslinked fibrin degradation products (XLFDP) in glomerular disease were measured by radioimmunoassay using monoclonal antibodies. The majority of patients with crescentic glomerulonephritis or focal segmental sclerosis/hyalinosis showed increased levels of urinary XLFDP. Mild to moderately increased levels were seen in some patients with other forms of glomerulonephritis. In focal segmental sclerosis/hyalinosis or membranous nephropathy, however, XLFDP levels correlated with proteinuria and the ratio of XLFDP to proteinuria was lower than in crescentic glomerulonephritis. Although isolated urinary XLFDP is not necessarily an index of intraglomerular coagulation and fibrinolysis, the ratio of XLFDP to proteinuria may provide a useful marker for active glomerular lesions as crescents and/or intraglomerular coagulation and fibrinolysis.

Adolescent↗
PubMed1986

Effects of heparin and defibrinotide on malignant hypertension in rats.

This study examines the effects of anticoagulant and antithrombotic drugs on blood pressure (BP), plasma renin activity (PRA) and renal glomerular and vascular lesions in rats following aortic ligation. Whole heparin, low molecular weight (LMW) heparin or defibrinotide was administered for 4 weeks to rats following complete aortic ligation between the renal arteries. BP and PRA in whole heparin treated rats were significantly lower than those in control rats (p less than 0.01, p less than 0.01). Renal morphology also revealed a reduced number of epithelial cell droplets (ECD) (the nature of which is unknown) in glomeruli and less severe vascular lesions (p less than 0.005, p less than 0.005). Decreased BP and PRA were seen in rats receiving LMW heparin, but the failure of LMW heparin to prevent vascular damage indicates that an increased anti-Xa activity or reduction of PRA is not enough to prevent these lesions in hypertensive rats. The rats receiving defibrinotide showed reduced BP only.

Animals↗
PubMed1983

Localization of intrarenal cross-linked fibrin in children with various renal diseases.

The localization of intrarenal cross-linked fibrin was examined by the effect of monochloroacetic acid treatment on the kidney sections. In acute glomerulonephritis or in mild diffuse or focal proliferative type of nephritis, cross-linked fibrin was observed mainly within glomerular capillary walls. Extension of cross-linked fibrin deposit over the mesangium or sclerotic area was seen in moderate to severe proliferative type of nephritis or in membranoproliferative glomerulonephritis. In hemolytic uremic syndrome or disseminated intravascular coagulation syndrome, cross-linked fibrin was detected within glomeruli and vessels.

Acetates↗
PubMed1982

Congenital deficiency of alpha 2-plasmin inhibitor in three sisters.

3 young Japanese sisters with congenital alpha 2-plasmin inhibitor (alpha 2-PI) deficiency are reported. They have mild umbilical bleeding and/or repeated prolonged bleeding after minor trauma, but rarely spontaneous bleedings. The most characteristic hemostatic findings were shortened whole blood clot lysis time and euglobulin lysis time. Activities of all hemostatic factors except alpha 2-PI were within normal range. Both functional and immunological absence of alpha 2-PI were found in the plasma, and this failure to detect alpha 2-PI was not corrected by the addition of the patient's plasma of the first described case of alpha 2-PI deficiency. Clinical and laboratory data revealed that these patients were probably homozygous for alpha 2-PI deficiency and born of heterozygous parents, but not of consanguineous ones. Bleeding episodes due to deficiency of alpha 2-PI in these patients were well controlled by an antifibrinolytic agent, tranexamic acid.

Blood Coagulation Tests↗