Abstract：
:FoxP3 is a member of the forkhead family of transcription factors critically involved in the development and function of CD25(+) regulatory T cells (Treg). Until recently, FoxP3 expression was thought to be restricted to the T-cell lineage. However, using immunohistochemistry and flow cytometric analysis of human melanoma tissue, we detected FoxP3 expression not only in the tumor infiltrating Treg but also in the melanoma cells themselves. FoxP3 is also widely expressed by established human melanoma cell lines (as determined by flow cytometry, PCR, and Western blot), as well as cell lines derived from other solid tumors. Normal B cells do not express FoxP3; however, expression could be induced after transformation with EBV in vitro and in vivo, suggesting that malignant transformation of healthy cells can induce FoxP3. In addition, a FOXP3 mRNA variant lacking exons 3 and 4 was identified in tumor cell lines but was absent from Treg. Interestingly, this alternative splicing event introduces a translation frame-shift that is predicted to encode a novel protein. Together, our results show that FoxP3, a key regulator of immune suppression, is not only expressed by Treg but also by melanoma cells, EBV-transformed B cells, and a wide variety of tumor cell lines.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Ebert LM,Tan BS,Browning J,Svobodova S,Russell SE,Kirkpatrick N,Gedye C,Moss D,Ng SP,MacGregor D,Davis ID,Cebon J,Chen Wdoi
10.1158/0008-5472.CAN-07-5664subject
Has Abstractpub_date
2008-04-15 00:00:00pages
3001-9issue
8eissn
0008-5472issn
1538-7445pii
68/8/3001journal_volume
68pub_type
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