Abstract:
An isolated DNA that includes a sequence encoding a polypeptide with which the monoclonal antibody TIA-1 produced by the hybridoma designated ATCC#HB10319 is immunologically reactive; a vector or a cell containing such a DNA; and a method of using such a DNA to identify cytolytic lymphocytes.
Abstract:
A monoclonal antibody which specifically binds to the surface recognition structure of a predetermined mature human T cell clone, which recognition structure renders the clone capable of acting as causative agent in a predetermined autoimmune disease, the monoclonal antibody being capable of specifically binding to the recognition structure of the clone to inhibit the ability of the clone to act as a causative agent in the predetermined autoimmune disease.
Abstract:
Methods for interfering with antigen presenting cell-mediated priming of resting peripheral blood T lymphocytes to undergo activation induced cell death ("apoptosis") by inhibiting an interaction between a membrane associated molecule ("an APC apoptotic ligand") present on stimulated antigen presenting cells ("APC") and a counter-receptor that is present on T lymphocytes are disclosed. The antigen presenting cells are preferably from the monocyte/macrophage cell line or are dendritic cells. Also disclosed are methods of screening for inhibitors of APC-mediated priming of T lymphocytes to undergo apoptosis and methods and agents for detecting, identifying and characterizing an APC apoptotic ligand. Inhibitors identified by the screening method of the invention are used to reduce the T lymphocyte depletion associated with HIV infection and thereby mitigate the severe immunodeficiency associated with AIDS by interfering with the association between HIV-infected antigen presenting cells, especially monocytes and macrophages, and T cells.
Abstract:
A monoclonal antibody which binds preferentially to a subset of the human CD8 lymphocyte population whereby to positively and precisely distinguish between cytotoxic effector and supressor effector cells in the CD8 cell population. The monoclonal antibody recognizes a novel epitope of LFA-1 antigen by means of which it can bind CD8 cells which express the eptope on a surface antigen thereof. The CD8 subset cell population to which this anitbody binds preferentially is the CD8 cytotoxic effector population. This selectivity of the monoclonal antibody enables cell sorting, diagnostic and positive therapeutic applications thereof to be utilized.
Abstract:
The invention provides isolated nucleic acids molecules, designated Siva nucleic acid molecules, which encode proteins involved in immune cell apoptosis. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing Siva nucleic acid molecules, host cells into which the expression vectors have been introduced, and nonhuman transgenic animals in which a Siva gene has been introduced or disrupted. The invention still further provides isolated Siva proteins, fusion proteins, antigenic peptides and anti-Siva antibodies. Diagnostic, screening, and therapeutic methods utilizing compositions of the invention are also provided.
Abstract:
A hybrid cell line is developed which produces a monoclonal antibody which binds to a unique antigenic site expressed on the surface of phagocytic cells. The monoclonal antibody binds to and activates a specific domain of the CD11b glycoprotein so as to inhibit adhesion dependent functions of the phagocytic cell, but it does not affect other phagocytic functions. This monoclonal antibody can be used as a reactant in an in vitro diagnostic immunoassay for detecting the unique antigenic site on the surface of normal human neutrophils.
Abstract:
A monoclonal antibody which binds preferentially to a subset of the human CD4+ lymphocyte population whereby to positively and precisely distinguish between helper-inducer and suppressor-inducer cells in the CD4+ cell population. The monoclonal antibody recognizes a novel antigen on the CD4+ lymphocytes by means of which it can bind CD4+ cells which express the antigen on the surface of CD4+ cells. The CD4+ subset cell population to which this antibody preferentially binds is the CD4+ helper-inducer population. This selectivity of the monoclonal antibody enables cell sorting, diagnostic and possible therapeutic applications thereof to be realized. The monoclonal antibody also reacts with CD8 cells, B cells and macrophages.
Abstract:
A method of reducing tissue injury in humans or other animal species using a monoclonal antibody to inhibit specific phagocyte functions. The monoclonal antibody is selected to bind to phagocytic leukocytes for the purpose of inhibiting migration to an inflammatory site in the body and to inhibit the adhesion and spreading of activated leukocytes reaching such an area and then, block release of toxic substances by these cells. The monoclonal antibody is administered in vivo prior or early in the course of an experience leading to an injurious inflammatory response such as can result from restoration of myocardial blood flow interrupted by an acute coronary thrombosis.
Abstract:
Monoclonal antibodies specific to a mature human T cell surface antigen of molecular weight of about 120,000 daltons as determined by electrophoresis, the antigen not being modulated by monoclonal antibodies specific to it and being restricted within the human lymphoid system to the surface of mature T cells, the monoclonal antibodies being capable of selectively binding mature human T cells and rendering them inactive in vivo and failing to induce the proliferation or activation of human lymphocytes.
Abstract:
A circulating, soluble form of DPPIV/CD26 isolated from human serum is disclosed. The serum form shares similar enzymatic and antigenic properties with the ubiquitous membrane form. However, in several biochemical aspects there are distinct differences. In particular, the circulating serum form has a molecular weight of 175 kDa (in contrast to the 105 kDa molecular weight of the membrane form), and it does not bind Adenosine Deaminase Type-1. Nevertheless, the circulating form expresses functional dipeptidylpeptidase IV activity and retains the ability to costimulate the T lymphocyte response to recall antigen. Circulating DPPIV has been determined to be the soluble form of a 175 kDa DPPIV CD26-related molecule rapidly expressed on the surface of activated T cells, prior to the expression of 105 kDa CD26. Although 105 kDa membrane type CD26 may be found in the serum in small amounts, the majority of serum DPPIV activity is provided by a novel peptidase structurally distinct from 105 kDa CD26/DPPIV. Polyclonal and monoclonal antibodies capable of distinguishing the 175 kDa form from the 105 kDa form are also disclosed.