Biomaterial Database

Inhibition of human lymphocyte transformation by tomato lectin. 1986

D C Kilpatrick, and C Graham, and S J Urbaniak

The lectin from tomato (Lycopersicon esculentum) fruits was found to be non-mitogenic for human lymphocytes in culture and actually suppressed spontaneous DNA synthesis. It also inhibited the transformation of human peripheral blood lymphocytes induced by recall antigens or allogeneic cells in vitro. This inhibition was most effective when the lectin was present from the beginning of the culture period, and could be abolished by the simultaneous addition of oligomers of N-acetylglucosamine. The tomato lectin was able to bind to several major lymphocyte cell surface glycoproteins, but not to the major histocompatibility (HLA) antigens. The binding of tomato lectin to lymphocytes could be inhibited by wheat germ agglutinin (WGA), but not by concanavalin A. Tomato lectin could agglutinate monocytes and B lymphocytes as well as T lymphocytes. Human serum used to supplement the culture medium supporting lymphocyte transformation was equally effective after passage through a tomato lectin-Sepharose column. The inhibition of lymphocyte transformation brought about by tomato lectin was not stopped by exogenously added interleukin 1 and/or interleukin 2, even at very high concentrations.

UI	MeSH Term	Description	Entries
D007166	Immunosuppressive Agents	Agents that suppress immune function by one of several mechanisms of action. Classical cytotoxic immunosuppressants act by inhibiting DNA synthesis. Others may act through activation of T-CELLS or by inhibiting the activation of HELPER CELLS. While immunosuppression has been brought about in the past primarily to prevent rejection of transplanted organs, new applications involving mediation of the effects of INTERLEUKINS and other CYTOKINES are emerging.	Immunosuppressant,Immunosuppressive Agent,Immunosuppressants,Agent, Immunosuppressive,Agents, Immunosuppressive
D007959	Lymphocyte Culture Test, Mixed	Measure of histocompatibility at the HL-A locus. Peripheral blood lymphocytes from two individuals are mixed together in tissue culture for several days. Lymphocytes from incompatible individuals will stimulate each other to proliferate significantly (measured by tritiated thymidine uptake) whereas those from compatible individuals will not. In the one-way MLC test, the lymphocytes from one of the individuals are inactivated (usually by treatment with MITOMYCIN or radiation) thereby allowing only the untreated remaining population of cells to proliferate in response to foreign histocompatibility antigens.	Leukocyte Culture Test, Mixed,Mixed Lymphocyte Culture Test,Mixed Lymphocyte Reaction,Mixed Leukocyte Culture Test,Mixed Leukocyte Reaction,Leukocyte Reaction, Mixed,Leukocyte Reactions, Mixed,Lymphocyte Reaction, Mixed,Lymphocyte Reactions, Mixed,Mixed Leukocyte Reactions,Mixed Lymphocyte Reactions
D008213	Lymphocyte Activation	Morphologic alteration of small B LYMPHOCYTES or T LYMPHOCYTES in culture into large blast-like cells able to synthesize DNA and RNA and to divide mitotically. It is induced by INTERLEUKINS; MITOGENS such as PHYTOHEMAGGLUTININS, and by specific ANTIGENS. It may also occur in vivo as in GRAFT REJECTION.	Blast Transformation,Blastogenesis,Lymphoblast Transformation,Lymphocyte Stimulation,Lymphocyte Transformation,Transformation, Blast,Transformation, Lymphoblast,Transformation, Lymphocyte,Activation, Lymphocyte,Stimulation, Lymphocyte
D011975	Receptors, Mitogen	Glycoprotein molecules on the surface of B- and T-lymphocytes, that react with molecules of antilymphocyte sera, lectins, and other agents which induce blast transformation of lymphocytes.	Lectin Receptors,Mitogen Receptors,Receptors, Lectin,Mitogen Receptor,Receptor, Mitogen
D006650	Histocompatibility Testing	Identification of the major histocompatibility antigens of transplant DONORS and potential recipients, usually by serological tests. Donor and recipient pairs should be of identical ABO blood group, and in addition should be matched as closely as possible for HISTOCOMPATIBILITY ANTIGENS in order to minimize the likelihood of allograft rejection. (King, Dictionary of Genetics, 4th ed)	Crossmatching, Tissue,HLA Typing,Tissue Typing,Crossmatchings, Tissue,HLA Typings,Histocompatibility Testings,Testing, Histocompatibility,Testings, Histocompatibility,Tissue Crossmatching,Tissue Crossmatchings,Tissue Typings,Typing, HLA,Typing, Tissue,Typings, HLA,Typings, Tissue
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001667	Binding, Competitive	The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements.	Competitive Binding
D014373	Tuberculin	A protein extracted from boiled culture of tubercle bacilli (MYCOBACTERIUM TUBERCULOSIS). It is used in the tuberculin skin test (TUBERCULIN TEST) for the diagnosis of tuberculosis infection in asymptomatic persons.	PPD,PPD-B,PPD-CG,PPD-F,PPD-L,PPD-S,Purified Protein Derivative of Tuberculin,PPD B,PPD CG,PPD F,PPD L
D014909	Wheat Germ Agglutinins	Lectins purified from the germinating seeds of common wheat (Triticum vulgare); these bind to certain carbohydrate moieties on cell surface glycoproteins and are used to identify certain cell populations and inhibit or promote some immunological or physiological activities. There are at least two isoforms of this lectin.	Agglutinins, Wheat Germ,Lectins, Triticum Vulgare,Lectins, Wheat Germ,Triticum Vulgare Lectin,Triticum Vulgare Lectins,Wheat Germ Agglutinin,Wheat Germ Lectin,Wheat Germ Lectins,Wheat Germ Agglutinin Isolectin 1,Wheat Germ Agglutinin Isolectin 2,Agglutinin, Wheat Germ,Germ Agglutinin, Wheat,Germ Lectin, Wheat,Lectin, Triticum Vulgare,Lectin, Wheat Germ,Vulgare Lectin, Triticum
D037102	Lectins	Proteins that share the common characteristic of binding to carbohydrates. Some ANTIBODIES and carbohydrate-metabolizing proteins (ENZYMES) also bind to carbohydrates, however they are not considered lectins. PLANT LECTINS are carbohydrate-binding proteins that have been primarily identified by their hemagglutinating activity (HEMAGGLUTININS). However, a variety of lectins occur in animal species where they serve diverse array of functions through specific carbohydrate recognition.	Animal Lectin,Animal Lectins,Isolectins,Lectin,Isolectin,Lectin, Animal,Lectins, Animal