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Biomedical subjects

I McConnell

Publications and source records attributed to I McConnell.

At least 127 records · Page 7Linked to original sources
PubMed1977

Complement receptors and cell associated complement components.

Membrane receptors for activated complement components are widely distributed amongst tissue cells of most mammalian species. Common amongst these are receptors for C3b which mediate many of the biological functions of C3. In addition, the genetic control of certain complement components is linked to the genes which code for the major histocompatibility complex. Many of these components are also present on cell surfaces. This suggests that the function of the complement system and the major histocompatibility complex may be related.

Animals↗
PubMed1977

Immune response to tumour antigens.

In experimental tumour systems in a wide variety of species there is clear evidence for the existence of immunity mechanisms directed against the elimination of the tumour. This is particularly true when the tumours are those induced either by carcinogens or by viruses. With spontaneously arising tumours in animals, specific immune responses to tumour antigens have been more difficult to demonstrate. Nonetheless these experimental systems do show that tumour antigens exist and that tumour growth can be controlled by immune responses to them. Since the immune system is the natural mechanism of control, one hopes that, when more is understood about the nature of tumour antigens on human tumours, we shall be in a position to apply some of our basic experimental knowledge to the immunotherapy of cancer in man.

Animals↗
PubMed1976

Immunoglobulins M and D as antigen-binding receptors on the same cell, with shared specificity.

Antigen-binding cells specific for Type 3 pneumococcal polysaccharide were detected among normal human peripheral blood lymphocytes, tonsillar lymphocytes, and umbilical cord blood lymphocytes. By using mu and delta-specific antiserum it was shown that some specific antigen-binding cells simultaneously expressed both IgM and IgD on their surface. Both classes on individual cells were able to bind the same antigen, suggesting that the variable regions of each immunoglobulin class, when present on the same cell membrane, are coded by the same V gene.

Antigens, Bacterial↗
PubMed1976

Variable region (Fv) determinants on mouse lymphocytes.

Antisera have been raised to the Fv fragment derived from a mouse alpha/lambda myeloma. These had different reactivities for Fv and mouse immunoglobulin and two of them appeared to detect v region framework determinants on normal mouse immunoglobulins. A large proportion of mouse lymphocytes were shown to have Fv determinants on the surface which was part of the B-lymphocyte antigen receptor. Most of the reacting cells were B lymphocytes. Fv determinants were not detected on the majority of T lymphocytes including cells with known T-helper cell activity. It is concluded that in mice, T cells do not express immunoglobulin v region framework determinants on their surface.

Animals↗
PubMed1976

Lymphocyte receptors. I. Receptors for Fc of IgG and complement (C3b) on immunoglobulin-bearing, antigen-binding and antibody-secreting cells.

Immunoglobulin (Ig) bearing, antigen-binding and antibody-secreting cells were investigated for the presence of membrane receptors for the Fc part of IgG and for C3b on their surface. Fc and C3b receptors were detected on the surface of most Ig-bearing and of most antigen-binding cells. Fc receptors were also detected on IgM antibody-secreting cells but not on IgG-secreting cells. C3b receptors were not detected on any antibody-secreting cells. These receptors are either lost from the B cell surface as they differentiate into antibody-secreting cells or are blocked in vivo by immune complexes or C3b.

Animals↗
PubMed1976

Lymphocyte receptors. II. Receptors for rabbit IgM on human T lymphocytes.

Human peripheral blood lymphocytes were found to give an opsonic adherence reaction with IgM-coated erythrocytes. This reactivity could only be detected after incubating the lymphocytes at 37 degrees, was confined to the T-lymphocyte population and could be inhibited by IgM but not IgG. It is concluded that human T lymphocytes possess a receptor for IgM.

Binding Sites, Antibody↗