PubMed Health⌕ Search

Biomedical subjects

G P Sandilands

Publications and source records attributed to G P Sandilands.

10 recordsLinked to original sources
PubMed1979

Lymphocyte emperipolesis revisited. II. Further characterization of the lymphocyte subpopulation involved.

We have previously shown that lymphocyte emperipolesis, the phenomenon whereby lymphocytes wander freely within the cytoplasm of larger host cells, is almost totally dependent on host cell pre-sensitization with IgG type antibody. In addition, the particular lymphocyte subpopulation involved was partially characterized as an Fc receptor bearing, non-T cell. In this study we have attempted to further define the emperipoletic lymphocyte subpopulation using cell fractionation procedures and correlation analysis. Significant correlation was found between emperipolesis and both Fc receptor bearing, surface immunoglobulin negative (Fc + SIg-) cells and antibody dependent lymphocyte mediated cytotoxicity; observations which suggest that the so-called K cells are the emperipoletic effector cells. The significance of these findings in relation to antibody dependent cytolysis is discussed.

Antibody-Dependent Cell Cytotoxicity↗
PubMed1978

Demonstration of Fc receptors on the surface of B lymphocytes.

Human blood lymphocytes were tested by an immunofluorescence technique for surface immunoglobulin and by a rosette test with IgG-sensitised red cells for Fc receptors. From combined tests and experiments involving fractionation of lymphocyte populations it is concluded that Fc receptors are demonstrable on most B lymphocytes by the rosette test, but only if the red cells are optimally sensitised. These observations are advanced as an explanation of the discrepant results of surface marker tests on B cells.

Animals↗
PubMed1977

Inhibiton of Fc-rosette formation by serum of patients with renal allograft rejection.

A test which measures the inhibition of Fc-rosette formation by the patient's serum was used in a group of 23 renal allograft recipients. All 13 serum samples obtained during acute rejection and 2 of 3 obtained during chronic rejection showed strong inhibitory activity, suggesting that the test is of value in confirming the presence of rejection. Its value as a predictive test remains to be established. Preliminary experiments suggest that both immune complexes and alloantibodies contribute to the observed inhibition of Fc-rosette formation.

Acute Disease↗
PubMed1977

Reduction in peripheral blood K cells and activated T cells in primary biliary cirrhosis.

Lymphocyte subpopulations were measured in the peripheral blood of 13 patients with primary biliary cirrhosis (PBC), 13 with chronic active hepatitis (CAH), and 16 age- and sex-matched normal subjects. A significant, relative and absolute, reduction in activated T cells and K cells, compared with that in normal subjects, was found in PBC but not in CAH. The reduction in K cells observed in PBC was found to be accompanied by a parallel decrease in lymphocyte-mediated antibody-dependent cytotoxicity.

Adult↗
PubMed1977

Increase in peripheral blood 'null' cells in extrinsic bronchial asthma.

Lymphocyte subpopulations were measured in the peripheral blood of fifteen patients with extrinsic bronchial asthma and twenty-seven normal control subjects. No significant differences in the absolute numbers of relative proportions of T, B or K lymphocytes were found. Antibody-dependent lymphocyte-mediated cytotoxicity (K-cell activity) was also found to be normal. The proportion and absolute number of 'null' cells were significantly increased in the asthmatic group: this population did not correlate with serum IgE levels, the eosinophil count or the duration of disease. The significance of these results in relation to suppressor T-cell control of IgE formation is discussed.

Adolescent↗
PubMed1975

Subpopulations of lymphocytes: a review.

Human lymphocytes comprise a heterologous population of cells which can be sub-divided on functional criteria or on the basis of surface membrane markers. Although it is widely accepted that human lymphocytes are broadly divisible into thymus dependent (T) and thymus independent (B) cells, recent evidence suggests that at least in humans this distinction may not be as clear cut as previously thought. An assessment of the relative numbers of T and B cells in human peripheral blood and lymphoid tissues can be made utilizing these marker systems. This has led to a reclassification of human lymphoid diseases according to the T and B cell concept, which might be of value in characterising the immunological status in health and disease, and may allow a more rational approach to the therapy of immune deficiency states and lymphoid malignancies.

Agammaglobulinemia↗
PubMed1975

Formation of auto-rosettes by peripheral blood lymphocytes.

A mean of 3-4% (0-5-19-5%) of the peripheral blood lymphocytes of normal adults were shown to bind three or more autologous erythrocytes in vitro to form auto-rosettes. Marked individual fluctuations were observed. Increased percentages were observed in patients with cancer, but not in other selected groups, including a group who had undergone thymectomy for myasthenia gravis. Auto-rosette formation was shown to be a property of T cells by the demonstration of (a) simultaneous binding of autologous and sheep erythrocytes, (b) non-inhibition of auto-rosette formation by anti-immunoglobulin, and (c) formation of auto-rosettes by mitogen-stimulated T blasts. Auto rosette formation is a property of high percentages of human thymocytes, and of lymphocytes treated with neuraminidase or stimulated to blast-cell trans-formation by phytomitogens. It is suggested that auto-rosette formation by these cells is related to their relatively low content of cell-coat sialic acid, as compared with untreated T lymphocytes. The possible influence of the cell coat on lymphocyte function is discussed briefly.

Animals↗