Impaired anti-leukemic immune response in PKCtheta-deficient mice.

Abstract:

:The cancer immunosurveillance hypothesis has found strong experimental support in recent years. It is believed that cytotoxic lymphocytes are important effectors in this process. PKCtheta plays an essential role in proliferation, activation and survival of these cells, but also proliferation and survival of leukemic T cells. In light of this, we tested the role of PKCtheta in T cell leukemia progression by inducing this disease in wild-type (wt) and PKCtheta-deficient mice with moloney-murine leukemia virus (M-MuLV). Leukemic PKCtheta(-/-) and wild-type (wt) mice showed the same profile of leukemic cell types, similar spleen and thymus sizes and comparable hematocrits. In contrast, disease incidence was higher and disease onset more rapid in PKCtheta(-/-) mice. Transfer of leukemic T cells from wt donors into PKCtheta-deficient and wt recipients induced leukemia in 100% and 40% of the mice, respectively. Interestingly, leukemic cells from PKCtheta(-/-) donors induced the disease in only 50% of the PKCtheta-deficient and 10% of the wt recipients. Intravenous injection of low numbers of EL4 cells induced tumors earlier in PKCtheta(-/-) mice. Taken together, our results show that PKCtheta is essential for the immune response to leukemia in mice and raise questions about the chronic treatment of humans with PKCtheta inhibitors.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Garaude J,Kaminski S,Charni S,Aguilò JI,Jacquet C,Plays M,Hernandez J,Rodriguez F,Hipskind RA,Anel A,Villalba M

doi

10.1016/j.molimm.2008.03.016

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

3463-9

issue

12

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(08)00137-5

journal_volume

45

pub_type

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