Abstract：
:We previously reported that bone marrows of breast cancer patients contained tumor antigen-specific CD8(+) T cells with central or effector memory phenotype. Using a recently developed ret transgenic mouse melanoma model, we now show that bone marrows and tumors of transgenic mice contain high frequencies of CD8(+) T cells specific for the melanoma antigen tyrosinase-related protein 2 and showing mostly effector memory phenotype. Moreover, increased numbers of bone marrow tyrosinase-related protein-2-specific effector memory CD8(+) T cells are also detected in transgenic animals older than 20 weeks with disseminated melanoma cells in the bone marrow and lymph nodes but showing no visible skin tumors and no further melanoma progression. After a short-term coincubation with dendritic cells generated from the bone marrow and pulsed with melanoma lysates, bone marrow memory T cells from mice without macroscopic melanomas produced IFN-gamma in vitro and exerted antitumor activity in vivo after adoptive transfer into melanoma-bearing mice. Our data indicate that functionally active bone marrow-derived melanoma-specific memory T cells are detectable at the phase of microscopic tumor load, suggesting that thereby they could control disseminated melanoma cells.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Umansky V,Abschuetz O,Osen W,Ramacher M,Zhao F,Kato M,Schadendorf Ddoi
10.1158/0008-5472.CAN-08-1464subject
Has Abstractpub_date
2008-11-15 00:00:00pages
9451-8issue
22eissn
0008-5472issn
1538-7445pii
68/22/9451journal_volume
68pub_type
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