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. 1994 May;96(2):292–296. doi: 10.1111/j.1365-2249.1994.tb06556.x

Dipeptidyl peptidase IV (DP IV) activity in serum and on lymphocytes of MRL/Mp-lpr/lpr mice correlates with disease onset.

T Kubota 1, H Iizuka 1, W W Bachovchin 1, B D Stollar 1
PMCID: PMC1534903  PMID: 7910536

Abstract

DP IV (CD26), a serine protease expressed on activated T cells, participates in immune responses in vivo as well as in vitro. We measured cell surface and serum DP IV in mice of the autoimmune MRL/Mp-lpr/lpr (MRL/l) strain, which is characterized by massive T cell proliferation and production of anti-nuclear autoantibodies. The mass of inguinal lymph nodes correlated with serum DP IV activity. Furthermore, serum DP IV activity increased markedly in parallel with the acceleration of lymph node swelling and anti-nDNA antibody production. Serum DP IV activity in 16-week-old MRL/l mice reached levels up to three higher than those in age-matched MRL/Mp- +/+ mice or BALB/c mice. Immunohistochemical staining and flow cytometric analysis identified DV IV on surfaces of lymphocytes from the enlarged lymph nodes of MRL/l mice. Subcutaneous injection of the mechanism-based inhibitor, Pro-boroPro, reduced protease activity in serum and cell suspensions prepared from spleen and lymph nodes, confirming the identity of the enzyme as DP IV. These results indicate that the massively accumulating lymphocytes of MRL/l mice have a property characteristic of activated T cells, although they express little surface CD4 or CD8 and do not produce IL-2. DP IV may participate in the role these cells play in the pathogenesis of MRL/l autoimmune disease.

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Selected References

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