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Biomedical subjects

G Lubec

Publications and source records attributed to G Lubec.

At least 307 records · Page 17Linked to original sources
PubMed1978

[Collagenolytic activity of cervix carcinoma].

We estimated collagenolytic activity of 10 invasive carcinomas of the cervix by means of a biological assay. Collagenolysis was found in 7 specimens. In order to detect the origin of the collagenolytic enzyme additional inhibition studies with ethylendiaminetetraacetate and normal human serum were performed. Normal human serum inhibited the enzymatic process by a mean percentage of 14.9%, EDTA up to 9.1%. D-penicillamine and 1.10-o-phenanthroline which inhibit collagenase specifically stopped the enzymatic activity of the tumor completely. According to our results it can be suggested that the collagenolytic activity of carcinoma of the cervix uteri is not derived from serum or from polymorphonuclear cells but is created by the tumor itself.

Collagen↗
PubMed1978

[The problem of anti-lung basal membrane immunity in the framework of allogenic lung transplant rejection].

This study is concerned with the significance of autoimmune processes caused by the damage of lung tissue after lungallo- and autotransplantation. In 15 mongrel dogs a left side lung-allotranplantation was performed, 5 of them were treated with immunsuppressive therapy in the posttransplantation period. A group of 5 dogs with autotransplantation of the left lung served as a control-group. In the posttransplantation period the development of humoral antibodies responding with lung basal membrane antigens was examined by daily taken sera as well as by elution of immuneglobulins from the rejected grafts in the passive hemagglutination and compared with the development of alloantibodies against donor-lung's tissue. Besides of regularly traceable humoral alloantibodies of lung allograft recipients in the posttransplantation period, in no group antilung basal membrane antibodies could be found.

Animals↗
PubMed1977

[Cell mediated immunity against tubular basement membranes in children with glomerular disease (author's transl)].

Applying a rosette assay we examined peripheral lymphocytes for their sensitivity against enzymatically solubilized tubular basement membranes (TBM). 20 healthy children and 34 children with glomerular diseases were tested. 2 patients from the panel of acute glomerulonephritis and 5 patients with chronic glomerulonephritis showed reactivity against this structure. Children with idiopathic nephrotic syndrome as well as patients with Alport's syndrome revealed no cell mediated immunity against TBM. On grounds of these findings we suggest that tubular involvement in glomerular diseases is not only secondary injury by affection of the glomerular appartus, but may be regarded as a target of the cell mediated immunity.

Acute Disease↗
PubMed1977

Collagenase activity of rat kidney with glomerulonephritis during the heterologous phase.

By means of a biological assay the collagenolytic activity of kidneys from rats with Masugi type glomerulonephritis in the heterologous phase and organs from control animals that were given normal heterologous serum was tested. Collagenolysis was found in both examples, but there wre quantitative and qualitative differences in the collagenase activity. In kidneys from animals with Masugi nephritis we found higher activity than in the controls. Normal rat serum inhibits the enzymatic process at a mean percentage of 9.1% whereas EDTA, a selective inhibitor of granulocytic collagenase inhibited the reaction up to 34%. It is concluded that this collagenolytic system is involved in the pathogenesis of the disease by degrading the structural associated collagen of the glomerular basement membrane.

Animals↗
PubMed1977

[Alpha-2-macroglobulin in children with glomerular diseases (author's transl)].

The serum and urine levels of alpha-2-macroglobulin (alpha2-MG) was determined in 33 children with glomerular diseases and in 26 healthy control children. Healthy children showed a minimum level of 275 mg% and maximum level of 337 mg%, with a mean concentration of 301 mg% and a standard deviation of 13 mg%. No alpha2-MG was detected in the urine. Steroid-treated patients with idiopathic nephrotic syndrome displayed elevated inhibitor levels of up to 490 mg%. This might be a direct result of steroid therapy or a consequence of reactively-increased protein synthesis in response to the renal protein loss. In all these patients the urine was found to be alpha2-MG-negative, irrespective of the presence or absence of proteinuria. In the miscellaneous group of glomerulopathies without the nephrotic syndrome, serum levels of alpha2-MG were shown to be normal. The urinary concentrations of alpha2-MG were related to the activity of the disease. alpha2-MG determination in serum and urine seems to be a tool for differential diagnosis and prognosis in some cases of glomerular disease.

Acidosis, Renal Tubular↗
PubMed1977

[Complement system and lymphocytotoxic antibodies in presensitized dogs after homologous lung transplantation ].

Left side orthotopic homotransplantation of the lung was performed in 8 mongrel dogs pre-sensitized by full-thickness skin transplants. The degree of sensitization was assessed by control of the lymphocytotoxic antibody titre. The behaviour of haemolytic complement activity, as well as the alterations in antibody titre were recorded up to 60 minutes after opening of the anastomoses. Evaluation was performed by analyses of significance. A significant decrease in lymphocytotoxic antibody titre (p less than 0.001), as well as a significant diminution in complement activity (p less than 0.01) was observed in blood samples from the pulmonary vein of the graft during the first five minutes following recirculation. This resulted from an interaction of both systems in the immune reaction. The further complement consumption by the graft in contrast to the constancy of the lymphocytotoxic antibody titre in the subsequent post-transplantation period can be explained by antibody-independent complement activation. Vena cava-- pulmonary vein differences in the lymphocytotoxic antibody titre and complement activity are correlated only five minutes after opening of the anastomoses (r = 0.75), which confirms the independence of both systems during later course of the reaction.

Animals↗
PubMed1977

[Vesicular fluid of hereditary bullous dystrophic epidermolysis splits alpha 1-antitrypsin].

In epidermolysis hereditaria bullosa dystrophica increased collagenase activity can be detected and seems to be one of the pathogenetic mechanisms of this disease. Neither the origin nor the mechanism of increased collagenolysis is known. Whether the cause of the enzymatic imbalance is the increased collagenase production or decreased collagenase-inhibitor activity cannot be decided. Factors of decreased protease inhibitor activity could be the quantitative or qualitative defect or the inactivation of the inhibitor. Clear, sterile vesicular fluid was incubated with alpha-1-antitrypsin, which is known to inhibit collagenase. By means of an immunoelectrophoretic method the cleaving of the inhibitor into two antigenic split products was found. We suggest that this might be responsible for the increased collagenolysis in this form of epidermolysis.

Child, Preschool↗
PubMed1977

[Specific humoral immunity in the circulation of dogs with allotransplanted lungs].

A method appropriate for identification and quantification of circulating antibodies reacting with donorlungantigens is presented in allogenous lungtransplantation. Following incubation of native tissue-slides taken from the second removed but not grafted donor lung with the recipient's serum, the specific humoral antibodies are detected by indirect immunfluorescence. Quantifying evaluation is performed by serum-dilutions. The preexisting specific antibody-titer found in DLA-sensitized animals shows a significant correlation with the duration of graft function when compared with lymphocytotoxic antibody-titer. In unsensitized dogs a regular appearance of circulating specific antibodies can be seen beginning from the fourth or fifth postoperative day. The increasing antibody-titer during further course is a feature of a humoral graft rejection represented in the periphereal blood-circulation.

Animals↗
PubMed1977

[Complement pattern in children with allergic-toxic exanthema--a contribution to differential diagnosis (author's transl)].

25 Sera from children with the clinical diagnosis: urticaria, allergic-toxic exanthema were examined for the complement components C3, C4 and C3-Activator. We applied the radial immunodiddusion. As controls served 50 helathy children and 25 children with morbili, rubeolae and scarlet fever. C3 was found to be decreased in 23 cases, C4 in 4 and C3-Activator in 19 cases of urticaria. This indicates the possiblity for the differential diagnosis, but children of the control groups did not show any consumption of one of the described complement components.

Child↗
PubMed1977

[Serum concentrations of proteinase inhibitors, complement components and of acid alpha-1-glucoprotein in children with myocarditis (author's transl)].

We examined 4 panels of children and 40 control patients for their serum levels of the complement components C3, C4 and the C3 activator, the proteaseinhibitors alpha-1-antitrypsin, alpha-2-macroglobulin and acid alpha-1-glycoprotein. Children of the group with active myocarditis revealed the consumption of the complement system, increased protease inhibitors and elevated acid alpha-1-glycoprotein. Group 2, children with the clinical diagnosis chronic myocarditis or status post myocarditis showed in six of seven cases low complement levels and elevated alsGP. 4 children showed increased A1AT and five increased A2MG. In the third panel: status post myocarditis, we estimated in five of eight patients complement activation, 4 children showed increased A2MG and alsGP and in 3 cases elevated A1AT levels were detected. Group 4 children revealed no complement consumption and showed no increased levels for the other proteins estimated, with the only exception of 1 case with increased alsGP. The children of the control group showed normal levels for the six proteins. By means of the examinations an inflammatory process can be detected, tissue injury can be indicated and the participation of the immune system can be shown.

Adolescent↗
PubMed1977

Collagenase activity in the human umbilical cord.

By means of a tissue culture assay the activity of the collagenolytic system of ten human umbilical cords was estimated. I found collagenolytic activity in the dimensions of about 10(-3) units of collagenase by comparing the tissue explants with known collagenase concentration on filter paper. EDTA, which is known to inhibit collagenases from human granulocytes, did not prevent the lysis. Normal human serum in a concentration of 1 mg/ml was found to inhibit the enzyme effect up to 36.34% (mean percentage of inhibition 29.67%). It is supposed that the rest of the activity is due to a tissue collagenolytic system. The whole activity was only by o-phenanthroline to be prevented. As a result can be said that the regression of the human umbilical cord is not primarily mumification but due to the activity of the collagenolytic enzyme system.

Edetic Acid↗
PubMed1977

[Cell mediated and humoral immunity against glomerular basement membranes in children with glomerular diseases (author's transl)].

43 patients with glomerular disease and 15 healthy children from 2-15 years of age were examined for the presence of cell mediated immunity against enzymatically solubilized glomerular basement membranes. Peripheral lymphocytes of 3 patients with acute hemorrhagic glomerulonephritis, 10 children with chronic glomerulonephritis and 2 children with congenital nephrotic syndrome showed positive reactivity in form of rosette formation. The application of the test for differential diagnosis between different glomerular diseases is discussed.

Acute Disease↗
PubMed1976

[Evidence of donoroganspecific humoral antibodies in hyperacutely and acutely rejected canine lungallotransplants (author's transl)].

A method to eluat donororganspecific antibodies enabling direct and specific access to the pattern of humoral rejection after lung allotransplantation is demonstrated. The antibodies were evaluated quantitatively and qualitatively by elution of lung-grafts immunoglobulins and by a consequent investigation of the eluates using the passive haemagglutination- and indirect immunflourescence- test against donors' lung-antigen. Humoral antidonorlung-antibodies could be proved in all rejected grafts belonging to sensitized as well as to unsensitized recipients. There can be seen a highly significant correlation when comparing the results of the passive haemagglutination and indirect immunfluorescence test (r = 0,93, p less than or equal 0,01). On the other hand negative results of the investigations of eluates by lungantigens of other dogs show the specifity of humoral graft rejection. The suprising fact that there does not exist an essential difference between the results of sensitized and nonsensitized animals reveals a humoral immunresponse in hyperacute as well as in acute rejection.

Animals↗
PubMed1976

[Alpha-1-antitrypsin in children with glomerular diseases (author's transl)].

Alpha-1-antitrypsin was determined in children with glomerular diseases by means of a quantitative radial immunodiffusion method. The concentration of this inhibiting protein has been found to be very low during relapses. An attempt has been made to correlate this finding with the clinical picture and the presumed underlying pathological mechanism. The loss of this inhibitor due to proteinuria is one of the explanations, in concurrence with the findings of other authors. The second explanation lies in the consumption of the inhibitor protein as a consequence of the reaction with liberated proteolytic enzymes.

Adolescent↗
PubMed1976

[The presence of cold agglutinins in hemolytic uremic syndrome (author's transl)].

A boy, 2 years old, developed a HUS after a pneumonitis. He was treated with Heparin, salicylates and recurrent peritoneal dialysis and recovered slowly. The course of the disease was complicated by myocarditis, gastric hemorrhage and severe neurologic disturbances. 7 days after unset of hemolysis a cold agglutinin titer of 1:256 was detected. This fact arises the question whether infection with Mycoplasma pneumoniae and the presence of cold agglutinins in serum could be involved in the development of HUS. The possibility of a viral etiology for this disease is discussed.

Agglutinins↗
PubMed1976

[Antibodies against the Epstein-Barr virus, capsid antigen in children with malignant neoplasms (author's transl)].

Sera from children were tested for antibodies to viral capsid antigens of Epstein-Barr virus. The method applied was the indirect immunofluorescence test. 25 sera from healthy donors were titrated as controls. In 14 patients with acute lymphocytic leukemia we found low levels, a tiny little girl with chronic myelocytic leukemia (?) AND THREE CHILDREN.WITH LYMPHOPROLIFERATIVE DISORDERS SHOWed highly increased serological reactivities. Investigated children with other kinds of tumours did not serologically differ significantly from the control group. Further investigations should clarify the role of this infectious agent.

Age Factors↗