The Journal of Experimental Medicine
Aegean Conferences: 2009 Conferences
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Published online 4 September 2001. doi:10.1084/jem.194.5.657
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© The Rockefeller University Press, 0022-1007/2001/9/657/ $5.00
The Journal of Experimental Medicine, Volume 194, Number 5, September 3, 2001 657-668


Original Article

Expression of the Serpin Serine Protease Inhibitor 6 Protects Dendritic Cells from Cytotoxic T Lymphocyte–induced Apoptosis: Differential Modulation by T Helper Type 1 and Type 2 Cells

Jan Paul Medemaa, Danita H. Schuurhuisa, Delphine Reaa, Joost van Tongerena, Joan de Jonga, Sandra A. Bresa, Sandra Labana, René E.M. Toesa, Mireille Toebesc, Ton N.M. Schumacherc, Bellinda A. Bladergroenb, Ferry Ossendorpa, J. Alain Kummerb, Cornelis J.M. Meliefa, and Rienk Offringaa
a Department of Immunohematology and Blood Transfusion, Leiden University Medical Center (LUMC), 2333ZA Leiden, Netherlands
b Department of Pathology, Free University Hospital, 1007 MB Amsterdam, Netherlands
c Division of Immunology, Netherlands Cancer Institute, 1066CX Amsterdam, Netherlands

Correspondence to: Jan Paul Medema, Dept. of Immunohematology and Blood Transfusion, LUMC, Albinusdreef 2, 2333 ZA Leiden, The Netherlands. Tel:00-31-71-5263013 Fax:00-31-71-5216751 E-mail:medema{at}mail.medfac.leidenuniv.nl.

Dendritic cells (DCs) play a central role in the immune system as they drive activation of T lymphocytes by cognate interactions. However, as DCs express high levels of major histocompatibility complex class I, this intimate contact may also result in elimination of DCs by activated cytotoxic T lymphocytes (CTLs) and thereby limit induction of immunity. We show here that immature DCs are indeed susceptible to CTL-induced killing, but become resistant upon maturation with anti-CD40 or lipopolysaccharide. Protection is achieved by expression of serine protease inhibitor (SPI)-6, a member of the serpin family that specifically inactivates granzyme B and thereby blocks CTL-induced apoptosis. Anti-CD40 and LPS-induced SPI-6 expression is sustained for long periods of time, suggesting a role for SPI-6 in the longevity of DCs. Importantly, T helper 1 cells, which mature DCs and boost CTL immunity, induce SPI-6 expression and subsequent DC resistance. In contrast, T helper 2 cells neither induce SPI-6 nor convey protection, despite the fact that they trigger DC maturation with comparable efficiency. Our data identify SPI-6 as a novel marker for DC function, which protects DCs against CTL-induced apoptosis.

Key Words: granzyme, CTL, survival, CD40, LPS


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