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Biochemical characterization of CD26 (dipeptidyl peptidase IV): functional comparison of distinct epitopes recognized by various anti-CD26 monoclonal antibodies.

Abstract：

:In this paper, we performed further biochemical characterization of the CD26 antigen, as defined by the mAbs in anti-1F7 and anti-Ta1, in order to clarify the observed functional differences among these mAbs. For this purpose, we developed a mAb, anti-5F8, which recognizes yet another epitope on the CD26 antigen different from that recognized by anti-1F7 and anti-Ta1 and compared their respective effect on T cell activation as well as the structures recognized by these mAbs. Functionally, anti-5F8 did not exhibit a comitogenic effect on T cell activation via the CD3 and CD2 pathways. Peptide mapping studies suggested that the 110 kDa molecules precipitated by these mAbs are identical. We showed that the 110 kDa CD26 structure on human T cells is composed of a family of heterogeneous molecules, as determined by isoelectric focusing studies. In addition, we demonstrated that the CD26 antigen has a DPPIV enzyme activity and this enzyme activity is found only on the principal basic structure of CD26 but not on the additional acidic structures. Biochemical studies also revealed that these mAbs recognized distinct epitopes on the CD26 antigen. Pulse-chase studies showed the the 1F7 epitope was found on both the immature (100 kDa) and mature (110 kDa) forms of the CD26 antigen. On the other hand, the Ta1 and 5F8 epitopes were expressed mainly on the mature form of the CD26 antigen. Moreover, anti-IF7 consistently precipitated an additional 43 kDa molecule in association with the principal 110 kDa molecule. Taken together, these data suggested that the additional 43 kDa structure or the distinct epitope recognized by anti-IF7 may play a role in human T cell activation via the CD3 and CD2 pathways.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Torimoto Y,Dang NH,Tanaka T,Prado C,Schlossman SF,Morimoto C

doi

10.1016/0161-5890(92)90099-j

subject

Has Abstract

pub_date

1992-02-01 00:00:00

pages

183-92

issue

2

eissn

0161-5890

issn

1872-9142

journal_volume

29

pub_type

杂志文章

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