A novel leukocyte differentiation antigen: two monoclonal antibodies TM2 and TM3 define a 120-kd molecule present on neutrophils, monocytes, platelets, and activated lymphoblasts.
We produced two hybridomas by fusion of mouse myeloma cells with splenocytes from a mouse immunized with the THP-1 human monocytoid leukemia cell line. Two cloned hybridoma cell lines, designated as TM2 and TM3, were obtained. They secreted antibodies against a unique cell surface antigen expressed on all normal peripheral blood monocytes, neutrophilic granulocytes, platelets, and mitogen-induced lymphoblasts, some cells from patients with immature-type lymphoid leukemias. However, the antibodies reacted neither with large numbers of peripheral blood lymphocytes nor with red cells. Cross-blocking studies showed that these monoclonal antibodies recognized the same or a nearly positioned antigen epitope. Immunoprecipitation of THP-1 cell extract with TM2 or TM3 under reducing and nonreducing conditions yielded a specific band of mol wt equal to 120,000 daltons. This determinant appeared to be involved in granulocyte chemotaxis, since neutrophilic granulocytes exposed to TM2 or TM3 showed a significant decrease in chemotaxis toward endotoxin-activated serum. These two monoclonal antibodies did not affect O2- release or luminol-dependent chemiluminescence of neutrophils. Moreover, they did not alter platelet aggregation induced by thrombin. TM2 and TM3 will provide a new reagent in defining the linkage between lymphoid and myeloid differentiation and intermyeloid development.
H
H
Ohto
H
H
Maeda
Y
Y
Shibata
R F
RF
Chen
Y
Y
Ozaki
M
M
Higashihara
A
A
Takeuchi
H
H
Tohyama
D000208:Acute Disease; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000378:metabolism; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000032:analysis* / Q000276:immunology; D001792:Blood Platelets / Q000276:immunology*; D002633:Chemotaxis; D000939:Epitopes / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000254:growth & development; D006801:Humans; D007938:Leukemia / Q000276:immunology; D008163:Luminescent Measurements; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology*; D008297:Male; D008565:Membrane Proteins / Q000276:immunology; D051379:Mice; D009000:Monocytes / Q000276:immunology*; D009439:Neuraminidase / Q000378:metabolism; D009504:Neutrophils / Q000276:immunology*; D010206:Papain / Q000494:pharmacology; D014018:Tissue Distribution; D014357:Trypsin / Q000494:pharmacology
D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D000939:Epitopes; D008565:Membrane Proteins; D009439:Neuraminidase; D014357:Trypsin; D010206:Papain