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Biomedical subjects

T R Jerrells

Publications and source records attributed to T R Jerrells.

78 records · Page 5Linked to original sources
PubMed1976

In vitro evaluation of immunity to Coxiella burnetii.

The rickettsial organism, Coxiella burnetii, is readily phagocytized by macrophages maintained in vitro. This phagocytosis does not lead to destruction of the organism but rather to intracellular multiplication within the macrophage. Specific antiserum added to the macrophage culture before or after infection, or reacted directly with C. burnetii organisms, fails to control subsequent intracellular replication. Macrophage cultures can be treated with lymphocyte products so that intracellular multiplication by C. burnetii is resisted. These lymphocyte products can be obtained from the culture supernatants of sensitized lymphocytes and antigens or from culture supernatants of Concanavalin A and normal lymphocytes. The activation activity of the lymphocyte supernatants paralleled their content of MIF.

Animals↗
PubMed1975

Detection of long-term cellular immunity to Coxiella burneti as assayed by lymphocyte transformation.

Delayed hypersensitivity to the antigens of Coxiella burneti, Nine Mile strain, was demonstrated in human subjects with various past histories of exposure to the organism by using lymphocyte transformation assays. Individuals with histories indicating exposure to C. burneti up to 8 years before the study demonstrated marked lymphocyte transformation in vitro to whole-cell antigens consisting of formalin-killed C. burneti phase I and phase II. These individuals also demonstrated a marked lymphocyte response to the trichloracetic acid-soluable phase I antigen. One individual who acquired Q fever during the study and one individual who received an experimental Q fever vaccine 4 years earlier were also evaluated by the lymphocyte transformation assay. It was also found that phase I trichloroacetic acid-soluble material was capable of acting as an antigen in the assay, whereas the phase II trichloroacetic acid-soluble material did not contain any antigenic material capable of causing lymphocyte transformation. The complete phase I trichloroacetic acid-soluble antigen, which was found to consist of protein and carbohydrate, was chemically fractionated into monospecific fractions. The fraction treated to eliminate carbohydrate was the only fraction found to elicit an in vitro response.

Antibodies, Bacterial↗
PubMedDate not supplied

Effects of ethanol on parameters of cellular immunity and host defense mechanisms to infectious agents.

Results of several studies have associated ethanol abuse with an increased incidence of infections, including opportunistic infections and those caused by microorganisms, as well as of certain types of cancer. Research findings from several laboratories clearly indicate that one possible mechanism in this association is an effect of ethanol on the immune system. We have developed an animal model fo ethanol ingestion in a liquid diet to study the effects of ethanol on immune responses. In most of the studies, we have used a pair-feeding design in which control animals are given a liquid diet that is isocaloric to the ethanol diet by the addition of either sucrose or dextran-maltose. Here, we discuss data obtained from in vivo studies of cellular function. We have studied the effects of ethanol on activation of T lymphocytes in vivo after intravenous injection of monoclonal antibody to CD3. The stimulation of cells in the spleen was assessed by measuring levels of cytokine RNA. We have also assessed the ability of animals to respond to a sublethal dose of Listeria monocytogenes to determine whether ethanol alters host defense mechanisms. Our findings indicate that ethanol ingestion reduced the ability of mice to respond to anti-CD3 and to resist infection with a bacterium that predominantly infects the liver.

Animals↗