Search PubMed⌕ Search

Biomedical subjects

T Godal

Publications and source records attributed to T Godal.

At least 109 records · Page 6Linked to original sources
PubMed1982

Quantitative comparison of Epstein-Barr virus receptor expression on sIgM and sIgG cell lines and B-cell lymphoma biopsies.

Over 50 B-cell derived lines and B-cell lymphoma and leukemia biopsies were screened for expression of the Epstein-Barr virus (EBV) receptor. The 13 sIgM-positive lines bound more than five times as much virus as the six IgG lines. Among the biopsies, the 17 sIgM, 11 sIgM and sIgD, and seven sIgG expressing biopsies were further divided according to expression of the C3 receptor. C3 receptor-positive biopsies, which expressed sIgM alone or along with sIgD, had the largest subpopulation of cells which expressed the EBV receptor (EBVR). C3 receptor-negative biopsies only expressed the EBVR on half as many cells as their C3 receptor-positive counterparts. However, the relative number of EBVR on individual EBVR-positive cells was independent of C3 receptor expression. Within the sIgG class, both C3 receptor-negative and positive cells expressed equally low levels of EBVR, both in terms of subpopulation and relative number of EBVR per positive cell. These results suggest that subpopulation expression of the EBV receptor is related to the C3 receptor but that relative number of receptors per cell is associated with sIg phenotype.

B-Lymphocytes↗
PubMed1982

Distribution of T-cell subsets identified by monoclonal antibodies in cell suspensions from lymph node biopsies of human B-cell lymphomas.

The distribution of T-cell subsets has been examined in cell suspensions from lymph node biopsies from 37 non-Hodgkin lymphomas (NHL) of B-cell origin and 8 cases of Hodgkin's disease (HD). T-inducer/helper cells (T4+ cells) and T-suppressor/cytotoxic cells (T8+ cells) were identified by the monoclonal antibodies OKT4 and OKT8, respectively. Compared with reactive lymph nodes the T-cell subset distribution was aberrant in 18/37 (48.6%) of the B-cell lymphomas. The T-suppressor subset was dominating cells in 14/37 (37.8%) and the T-helper subset in 4/37 (10.8%) of the cases examined. In patients with leukaemic disease, a concordant T-cell subset distribution in lymph nodes and PBL was observed in 5 out of 6 cases. HLA-DR antigen was examined in a selected number of cases with a heteroantiserum. In general, the T-cells from neoplastic tissues expressed an increased percentage of HLA-DR antigen. This was most pronounced in cases with a dominance of T8+ cells, in which the majority of T8+ cells expressed HLA-DR antigen. These findings suggest that an increased proportion of activated T-suppressor cells are present in a proportion of B-cell lymphomas. Possible clinical and biological implications are discussed.

Antibodies, Monoclonal↗
PubMed1982

Immunoglobulin class specific antibodies to M. leprae in leprosy patients, including the indeterminate group and healthy contacts as a step in the development of methods for sero-diagnosis of leprosy.

IgA, IgM and IgG anti-M. leprae antibody activity was quantitated by solid phase radioimmunoassay in groups of untreated leprosy patients throughout the spectrum, in lepromatous leprosy patients treated for more than 10 years, in an indeterminate leprosy group, and in a non-leprosy control group. IgA, IgM and IgG anti-M. leprae antibody activity increased from the group of healthy individuals exposed to M. leprae but without clinical signs of leprosy to tuberculoid (BT and BT/TT) and further to lepromatous (BL to LL) leprosy. There was a considerable overlap in IgA antibody activity, while the overlap between controls and tuberculoid and lepromatous leprosy was less than 20% in the IgM and IgG assays. After more than 10 years of treatment, the IgG anti-M. leprae activity had decreased markedly, whereas there was less effect in the IgA assay and no significant change in the IgM assay. In contrast to earlier findings, the group of 'strictly indeterminate leprosy' showed signs of an active humoral immune response against M. leprae. The IgM anti-M. leprae activity was higher in indeterminate leprosy than in the control group with virtually no overlap. IgA anti-M. leprae was higher in indeterminate leprosy, but with considerable overlap with the controls. No difference between these two groups was found in the IgG assay. The results are discussed in relation to the value of the various immunoglobulin specific anti-M. leprae assays for different purposes, including development of techniques for sero-diagnosis of leprosy.

Antibodies, Bacterial↗
PubMed1981

A microassay for quantitatively detecting the Epstein-Barr virus receptor on single cells utilizing flow cytometry.

A quantitative microassay for detecting and analyzing the Epstein-Barr virus receptor (EBVR) utilizing fluorescein-conjugated virions is presented. The test is virus substrain-specific. Both the B95-8 and P3HR-1 strains were labelled and adsorbed to a variety of targets. Relative binding of virus was assessed by flow cytometry, the results being directly comparable with those obtained by earlier methods. Cell size and cellular DNA content were measured simultaneously with virus binding, thus enabling us to calculate EBVR density and to correlate receptor synthesis and cell cycle stage.

Cell Line↗
PubMed1981

Spontaneous (H)-thymidine uptake in histological subgroups of human B-cell lymphomas.

Spontaneous (3H)-TdR incorporation was studied in cell suspensions from 64 patients with monoclonal B-cell neoplasias. Among various incubation periods a long-term (20 h) assay with (3H)-TdR had the greatest discriminatory power versus non-neoplastic lymph node cell suspensions. The (3H)-TdR uptake correlated positively with cell volume, nuclear volume, and cells in S + G + M phase of the cell cycle. A high degree of heterogeneity with regard to (3H)-TdR incorporation was found within several histological groups of the Kiel classification, especially in low-grade malignant lymphomas of centroblastic/centrocytic origin and in the lymphoplasmacytoid groups. In highly malignant lymphomas (3H)-TdR uptake was statistically, significantly higher than in lymphomas of low-grade malignancy. Patients with localized disease (stages I and II) and those with "B'-symptoms showed increased incorporation of radioactive thymidine as compared to patients with disseminated mined by histopathology and spontaneous uptake of (3H)-TdR.

Adult↗
PubMed1981

Cellular and humoral factors in host susceptibility to Lewis lung carcinoma.

Cellular and humoral anti-tumour reactivity in strains of mice highly susceptible (C57Bl/6) or less susceptible (C57Cl/6 x DBA/2 = B6D2F1) to Lewis lung carcinoma (LLC) was investigated. Natural killer cell activity in a 51Cr release assay against this tumour could be demonstrated with a good correlation to in vivo susceptibility. This has not been demonstrated earlier for solid, spontaneous tumours. T-cell deficiency (congenital athymic (nude mice)) did not affect the cumulative incidence of tumour take. However, the number of lung metastases was significantly reduced in nude mice. Treatment with antilymphocyte serum (ALS) increased the susceptibility to LLC in both strains. In a soft agar colony assay a marked reduction in the number of colonies was observed when tumour cells were incubated with serum from B6D2F1 mice as compared to serum from C57Bl/6 mice, prior to seeding. Apparently naturally occurring cellular, as well as humoral effector mechanisms are involved in host resistance to Lewis lung carcinoma in the mouse.

Animals↗
PubMed1981

Inhibitory effect on tumour colony formation of mouse serum associated with tumour resistance in vivo in semi syngeneic mice.

Differences in tumour susceptibility between strains of mice (C57Bl/6 and C57Bl/6 X DBA/2 = B6D2F1) could be demonstrated for several tumours of C57Bl origin, both solid tumours (B16 melanoma and Lewis lung carcinoma) and lymphomas (RBL-5, 136-3 and ALC). Serum from mice with high tumour resistance in vivo (B6D2F1) showed an inhibitory effect on tumour colony formation in a soft agar colony assay. Serum from mice with lower tumour resistance (C57Bl/6) had no effect. When other F1 hybrids of C57Bl/6 parental origin were tested, the same correlation between in vitro inhibition of tumour colony formation and in vivo susceptibility was found. The serum factor was species non-specific, since the activity was expressed against in vitro grown cell lines of human origin. The tumour colony inhibitory activity was heat sensitive (56 degrees C for 30 minutes), precipitable by (NH4)2SO4, and not removed by adsorption on tumour cells. These results demonstrate the existance of a naturally-occurring humoral tumerostatic factor(s) which correlates to in vivo susceptibility to tumour cells. Its relationship to NK cell activity is discussed.

Animals↗
PubMed1981

Epstein-Barr virus receptor expression is correlated to cell cycle phase.

Epstein-Barr virus (EBV) receptor positive cells absorbed FITC-conjugated virions and were subsequently stained for DNA content with propidium iodide. These cells were analyzed by flow cytometry to determine the relationship between cell cycle and EBV receptor (EBVR) expression on single cells. EBVR was present throughout the entire cell cycle. The level of expression, however, varied; increasing in G1 and G2/M while remaining approximately constant in S phase. Analysis of receptor density in terms of cell size demonstrated that smaller cells, in early G1, have a greater density of receptors per unit membrane than larger G2/M and S phase cells.

Animals↗
PubMed1981

Immunological subsets in human B-cell lymphomas.

Fifty human B-cell lymphomas have been studied with regard to surface markers (surface immunoglobulins (sIg) and complement receptors (CR)), capping of sIg, and relative amounts of sIg by single-cell flow cytometry. The results show that these lymphomas can be subdivided into distinct immunological subsets. Whereas one histological subgroup (lymphocytic) consisted of only one immunological subtype, others were heterogeneous with regard to immunological subtypes. This was most striking in nodular lymphomas of germinal centre cell origin (centroblastic/centrocytic). Our studies provide further evidence for the existence of a large number of subsets in the B-cell compartment of the immune system, sIgD was only found in association with sIgM. The relative amounts of sIgD varied, especially in nodular lymphomas. A discrepancy between capping of sIgM and sIgD was also found in some lymphomas belonging to this group. These findings together with other observations suggest that sIgD plays a role in B-cell maturation and differentiation events taking place in germinal centres and becomes lost during this process. A close association was found between the presence of CR and capping of sIgM but not capping of sIgD or sIgG. Nodular lymphomas expressing sIgG only, lacked CR. These findings suggest that CR may become lost during maturation and differentiation processes also taking place in germinal centres. Lymphoplasmacytoid lymphomas, which show morphological evidence of differentiation towards plasma cells, could be subdivided into three immunological subsets, indicating that plasma cell maturation may take place from different subsets of B cells.

B-Lymphocytes↗
PubMed1981

Cell-associated immunoglobulin in human non-Hodgkin lymphomas. A comparative study of surface immunoglobulin on cells in suspension and cytoplasmic immunoglobulin by immunohistochemistry.

Eighty-three non-Hodgkin lymphomas classified according to the Kiel classification have been studied with regard to surface immunoglobulin (sIg) on cells in suspension and cytoplasmic immunoglobulin (cIg) by the peroxidase anti-peroxidase method (PAP) on formaline-fixed tissue sections. Fifty-six out of 66 examined (i.e. 85%) revealed a monoclonal staining pattern for sIg, whereas 37/70 (53%) gave a monoclonal staining pattern for cIg by PAP. The methods combined gave a monoclonal staining pattern in 73/83, i.e. in 88%, of the biopsies tested. The discrepancies between the two methods were largest in centroblastic/centrocytic and lymphocytic lymphomas. With regard to the light chain staining patterns, complete agreement between the two methods was obtained in the 20 cases that allowed such analysis to be made. This suggests that the specificity of PAP, as carried out in this study with reagents purified by immunoabsorbent techniques, is satisfactory. On a basis of heavy chain isotypes centroblastic/centrocytic, lymphoplasmacytoid, and immunoblastic lymphomas could be divided into distinct immunological subgroups. In four biopsies the sIg heavy chains were mu + delta, whereas mu + gamma chains were detected by PAP. This finding may be relevant to the mu leads to gamma switch known to occur during normal B-cell differentiation. Immunoglobulin inclusions were found in 8 cases--3 belonging to the immunoblastic group, and 5 to the lymphoplasmacytoid group.

Adult↗
PubMed1980

Mitogenic effect on human lymphocytes of insolubilized anti-immunoglobulins. I. Specificity of the stimulating agent.

The mitogenic response of peripheral blood lymphocytes to various anti-immunoglobulin reagents has been studied by measuring incorporation of a radioactive thymidine into macromolecules. Coupling of anti-F(ab')2 or anti-light chain antibodies to Sepharose beads leads to a 5-fold increase in their mitogenic capacity with 50-fold less antibodies per culture. Pepsin-digested F(ab')2 fragments had a mitogenic capacity similar to intact antibody molecules. Anti-F(ab')2 antibodies purified by immunoabsorbent columns were found to be more effective as mitogen than unpurified antibody fractions. Antibodies to kappa- or lambda-light chains were found to be mitogenic, whereas antibodies specific to various heavy chain classes failed to induce a significant response. Isolated light chains were much more effective in inhibiting the reaction than isolated mu-chains. It is concluded that insolubilized anti-light chain antibodies are mitogenic to human peripheral blood lymphocytes.

Animals↗
PubMed1979

Increased serum IgE in Hodgkin's disease is of polyclonal origin.

The light chain of serum IgE from 4 untreated patients with Hodgkin's disease with elevated IgE levels was studied by an immunoadsorbent technique. Serum IgE was found to contain both kappa and lambda light chains in all cases studied. In addition an association between serum levels of IgE and that of IgA, IgG, and IgM was demonstrated. These findings make it unlikely that increased serum IgE in Hodgkin's disease is of monoclonal origin and support the view that serum IgE in such patients reflects a general disturbance in the regulation of their humoral immune response.

Adult↗