A new monoclonal anti-CD7 antibody reactive on paraffin sections.

Abstract

CBC.37 monoclonal antibody (mAb) was generated using balb/c mice immunized with CEM T cell line. It was selected because of its strong reactivity on T lymphocytes on paraffin tissue sections. The anti-CD7 specificity of CBC.37 mAb was assessed by immunohistochemistry, cross-blocking, and cross-immunoprecipitation experiments using CBC.37 and the anti-CD7 mAb DK24. CBC.37 mAb immunoprecipitated a 40-kDa protein. Cross-blocking and cross-immunoprecipitation experiments demonstrated that the two antibodies recognized the same molecule. Immunostaining of a large number of reactive lymph nodes and B and T cell lymphomas confirms that CBC.37 mAb was directed against T cells. As expected, on reactive lymph nodes the staining pattern was comparable to that of CD3. Among the 110 T cell lymphomas examined, all T lymphoblastic lymphomas were positive (15+/15; 100%). As a result of the frequent loss of CD7 antigen, only 25+/95 (26%) of peripheral T cell neoplasms were found to be positive for CBC.37. A marked reduction in the number of CBC.37-positive T cells was observed in 7 of the 60 cases of benign inflammatory dermatoses studied (approximately 12%). CBC.37 was unreactive with all healthy and neoplastic non-lymphoid samples examined. Because the lack of CD7 expression in T cell lymphomas is of diagnostic value, CBC.37 mAb in association with other anti-T cell antibodies working on paraffin sections could be of particular value in asserting the diagnosis of T cell lymphomas in routine histopathology.

• Authors: T Al Saati, L Alibaud, L Lamant, J Boyes, M March, G Delsol
• Journal: Applied immunohistochemistry & molecular morphology : AIMM (Appl Immunohistochem Mol Morphol) Vol. 9 Issue 4 Pg. 289-96 (Dec 2001) ISSN: 1541-2016 [Print] United States
• PMID: 11759053 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Monoclonal
• Antigens, CD7
• Antigens, Neoplasm

Topics

• Animals
• Antibodies, Monoclonal (biosynthesis, isolation & purification)
• Antigens, CD7 (immunology)
• Antigens, Neoplasm (immunology)
• Flow Cytometry
• Fluorescent Antibody Technique
• Humans
• Immunoassay
• Immunohistochemistry
• Leukemia, T-Cell (immunology, pathology)
• Lymphoma, T-Cell (immunology, pathology)
• Mice
• Mice, Inbred BALB C
• Paraffin Embedding (methods)
• Precipitin Tests