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Biomedical subjects

M Madsen

Publications and source records attributed to M Madsen.

At least 253 records · Page 14Linked to original sources
PubMed1978

Lymphocyte subpopulations in man: no selective loss during isolation from defibrinated blood.

Human lymphocytes isolated from defibrinated blood are characterized especially in relation to the total yield of lymphocytes and their subpopulations identified by membrane markers. The defibrination per se gives a significant loss of monocytes and granulocytes but no loss of lymphocytes, indicating that no selective loss of lymphocytes occurs. In a comparison of heparin-stabilized and defibrinated blood no difference in yield is found during every single step of the isolation procedure. Quantitation of E-RFC and SmIg-positive lymphocytes gives no differences in comparing the respective isolated suspensions of mononuclear cells. The observed difference in EA- and EAC-RFC can freely be ascribed to the difference in monocyte contamination. Further, no correlation is found between total lymphocyte yield and the relative number of the subpopulations identified, i.e. E-RFC, SmIg-positive, Fc-receptor- and complement-receptor-bearing lymphocytes. Hence it is concluded that defibrinated blood is optimal as blood source for the isolation of mononuclear cells when lymphocyte subpopulations are studied and enumerated.

Cell Separation↗
PubMed1978

Lymphocyte subpopulations in man: ox erythrocytes as indicators in the EA- and EAC-rosette tests: serological and technical aspects.

Serological properties of ox erythrocytes (ORBC) make it possible to select cells which exhibit weak agglutinability despite strong antibody sensitization. This property and the non-binding of unsensitized ORBC to lymphocyte surface membranes make these cells excellently suited as indicators in techniques for the identification of erythrocyte-antibody (EA) and erythrocyte-antibody-complement (EAC) rosette-forming lymphocytes (RFC). This report describes the relevant serology for the selection of appropriate cells and antisera. Further, some of the technical aspects of these tests are discussed. A simple method for the sensitization of ORBC with complement is described. The basis for this method is the naturally occurring complement-binding anti-ORBC antibodies of the IgM class in human sera. After zymosan treatment the sera are deficient in the fifth component of complement and hence non-haemolytic, which make these sufficient as sensitizing agents in the preparation of EAC indicator cells. The relations of EA- anc EAC-RFC to be established T and B lymphocyte subpopulations are revealed by the enrichment and depletion of lymphocytes rosetting with 2-aminoethylisothiouronium bromide (AET)-treated sheep erythrocytes (SRBC).

Animals↗
PubMed1978

Lymphocyte subpopulations in man. Expression of HLA-DR determinants on human T cells in infectious mononucleosis.

In a study of lymphocyte subpopulations in peripheral blood during infectious mononucleosis the lymphocytosis was found to be of T-cell origin (i.e. E-RFC), while the number of non T lymphocytes (i.e. EA-, EAC-RFC and SmIg + ve cells) was normal in 7 out of 8 patients. Ten patients were tested for the presence of HLA-DR determinants on their B and T cells and not only B lymphocytes but also a great part (31--75%) of T cells were lysed by the anti HLA-DR testsera, indicating that HLA-DR determinants are expressed on a population of T cells in IM patients. After recovery all patients were retested and showed a normal pattern of HLA-DR typing. This indicates an increase of HLA-DR antigens on T cells or a vigorous proliferation of a small DR-positive T-cell subpopulation during the acute stage of IM.

Absorption↗
PubMed1977

Should the indications for prenatal chromosome analysis be changed?

Amniocentesis for chromosome analysis was performed in 1086 pergnant women, 739 of whom had an increased risk of giving birth to a child with chromosome abnormalities. Such abnormalities were found in almost identical proportions among the fetuses with an increased risk (1.2%) and among those with no increased risk (1.4%). Findings in several other studies seem to confirm that there is no significant difference between the risk groups in the proportion of abnormalities found. This suggests that our current risk groups may not be the right ones, but a much larger study is needed to confirm this.

Amniocentesis↗
PubMed1976

Hyperacute rejection of a kidney allograft may be caused by cytotoxic lymphocytes.

A case of hyperacute rejection of a kidney allograft is described in relation to the clinical, patho-anatomical, and immunological findings. An 18-year-old male was allotransplanted for the third time with a necrokidney from an unrelated HLA-A and B, full house identical and blood group ABO identical donor. Serological crossmatches performed with recipient sera harvested before and after transplantation were negative. In spite of this, the kidney suffered hyperacute rejection according to clinical and patho-anatomical criteria. The cellular, complement independent cytolytic capacity of recipient lymphocytes drawn before and after transplantation against donor lymphocytes was tested by the direct Cell Mediated Lympholysis (CML) test. This test was positive 24 hours after transplantation, whereas it had been negative before this. Lymphocytolysis was enhanced by inactivated recipient serum harvested before and after transplantation. These findings suggest that hyperacute rejection of a kidney allograft may be ascribed to presensitized, not necessarily circulating, effector lymphocytes either alone, or in concert with antibody(ies) not disclosed by conventional crossmatching.

Acute Disease↗
PubMed1976

Prolonged survival of AKR mice treated with the saponin adjuvant Quil A.

Treatment of AKR mice with the saponin Quil A delayed their death in spontaneous leukaemia. In vitro tests did not demonstrate any influence on infection of rat cells with Kirsten sarcoma virus. Quil A in the concentration nanogram/ml doubled the mitogen response of AKR spleen cells to lipopolysaccharide.

Adjuvants, Immunologic↗
PubMed1976

Aberrant tissue bands and craniofacial defects.

A report of 8 cases of craniofacial anomalies and aberrant tissue bands has been presented. Analyses of the pedigrees, pregnancy histories and chromosome analyses were unrevealing. This syndrome appears to be a sporadic disorder and it is important to delineate it further from other syndromes for which recurrence risks are known.

Abnormalities, Multiple↗
PubMed1975

Surgical treatment of ureterocele. A follow-up study of 56 operated cases in 52 adult patients.

A material covering 25 years and comprising 52 patients with 56 surgically treated ureteroceles was followed up over periods varying from 3 to 27 years, the average being 12 years. The initial symptoms and treatment are described. Most of the patients were treated with transurethral diathermy incision of the ureteroceles. 10 patients had died before the follow-up and one could not be located. 73% of the remaining 41 patients had no complaints at follow-up and 71% of the patients treated with transurethral incision were symptomatically cured. Vesico-ureteric reflux was demonstrated in 9 patients, of whom 3 had pyelonephritic changes in the kidneys. The groups of patients treated with resection or excision of the ureteroceles were too small to allow significant conclusions.

Adult↗