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CUTTING EDGE |

*
Institute of Physics and Biophysics and
Institute of Chemistry and Biochemistry, University of Salzburg, Salzburg, Austria
Macrophages (M
) play essential roles both in tumor defense
and normal tissue homeostasis by removal of transformed as well as
damaged and disintegrating cells. Whereas tissue necrosis is known to
provoke inflammatory responses, removal of apoptotic cells has been
assumed to be immunologically inert. We now show that while M
exposure to necrotized tumor cells causes pronounced stimulation of
M
antitumor activity, exposure of M
to apoptotic tumor cells in
contrast results in impairment of M
-mediated tumor defense and even
support of tumor cell growth. Given the fact that apoptosis is
a consequence of various cancer treatment modalities, this may lead to
a suppression of local antitumor reactions and thus actually counteract
endogenous immune-mediated tumor defense
mechanisms.
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