Abstract:
:We show further differences between two clinically related entities, T-cell acute lymphoblastic leukemia (T-ALL) and lymphoblastic lymphoma (T-LL), by using several monoclonal antibodies (MoAbs) reacting with either constant or variable regions of T-cell receptors (TcR) alpha beta and gamma delta or with various CD molecules. We analyzed a panel of 15 T-ALL and 15 T-LL selected for their cell surface expression of the CD3 molecules. The results indicated that TcR gamma delta is more frequently used than TcR alpha beta in T-ALL (10 of the 15 patients tested). This is in contrast to the results obtained with T-LL where the vast majority expressed TcR alpha beta (13 of the 15 patients). These findings suggest that the leukemic cells could have a different origin in these two diseases. In addition, analysis of TcR variable regions expressed by the leukemic blasts showed that, in most cases, they had rearranged functional V delta 1 gene segments (8 of 11 patients), whereas in a unique case V delta 2 gene segment was used. Together, these results and those indicating that T-ALL cells coexpress the CD1a, b, and c molecules strengthen the possibility that although these leukemic cells express the CD3-TcR complex at their cell surface, their normal counterparts are not found in peripheral blood.
journal_name
Bloodjournal_title
Bloodauthors
Gouttefangeas C,Bensussan A,Boumsell Lsubject
Has Abstractpub_date
1990-02-15 00:00:00pages
931-4issue
4eissn
0006-4971issn
1528-0020journal_volume
75pub_type
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