Activation-Dependent Induction of T Cell Alanyl Aminopeptidase and Its Possible Involvement in T Cell Growth

  • U. Lendeckel
  • T. Wex
  • D. Reinhold
  • M. Arndt
  • A. Ittenson
  • K. Frank
  • S. Ansorge
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 421)


Membrane alanyl aminopeptidase (APN, EC 3.4.1 1.2) is a 150-kDa metalloprotease which has been identified as the leukocyte surface differentiation antigen CD131. In humans the APN gene is located on the long arm of chromosome 15 (ql 1-gter)2 with the coding part of the gene encoded by 20 exons3. Within the haematopoetic system APN is dominantely expressed in cells of the myelo-monocytic lineage and is used, therefore, as a standard marker in the diagnosis of leukaemia. Aminopeptidase N of leukocytes is supposed to be involved in the degradation of neuropeptides4–7 and cytokines8,9, but its function remains to be fully elucidated. APN may function as a corona virus receptor10–13 and seems to contribute in tumor invasion and matrix degradation14–15. APN is also implicated in antigen processing16. Furthermore, anti-CD13 monoclonal antibodies have been shown to neutralize CMV17. In recent years evidence accumulated showing that malignant B and T cells18–23 as well as activated T cells24–26 are capable of expressing APN on the cell surface. A similar mechanism of induction may underlie the CD13 surface expression of tumor infiltrating T cells27, or T cells28 and NK cells29 derived from local sites of inflammation.


Acute Lymphoblastic Leukemia Aminopeptidase Activity CD13 Surface Expression Corona Virus Aminopeptidase Inhibitor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • U. Lendeckel
    • 1
  • T. Wex
    • 1
  • D. Reinhold
    • 1
  • M. Arndt
    • 1
  • A. Ittenson
    • 1
  • K. Frank
    • 1
  • S. Ansorge
    • 1
  1. 1.Institute of Experimental Internal Medicine Center of Internal MedicineOtto-von-Guericke University MagdeburgMagdeburgGermany

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