Expression of T-plastin, FoxP3 and other tumor-associated markers by leukemic T-cells of cutaneous T-cell lymphoma.
Peripheral blood cells from 28 patients with leukemic cutaneous T-cell lymphoma including 25 patients with Sezary syndrome were evaluated for expression of regulatory T-cell-associated markers (FoxP3, CD25, CTLA-4, neurophilin-1), T-cell activation markers (CD28 and its ligands B7.1 and B7.2) and NK cell-associated markers (NKG2D and its ligands Mic-A and Mic-B) using real-time quantitative polymerase chain reaction. T-plastin served as a positive genetic marker, and its expression correlated to blood tumor burden. More than 90% of samples had transcripts for CD28 and Mic-B, but less than 30% of samples expressed FoxP3, CTLA-4 and CD25. Expression of Mic-B by neoplastic cells could provide another mechanism to inhibit anti-tumor immune responses. FoxP3 expression correlated with a poor prognosis. Although the underlying mechanisms accounting for this correlation remain unclear, the expression of the Foxp3 and CTLA-4 regulatory elements indicates that a subset of leukemic cases displays a regulatory T-cell phenotype.
Capriotti
Elisabetta
E
Department of Dermatology, University of Rome, Tor Vergata, Italy.
Vonderheid
Eric C
EC
Thoburn
Christopher J
CJ
Wasik
Mariusz A
MA
Bahler
David W
DW
Hess
Allan D
AD
D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism; D051940:B7-2 Antigen / Q000235:genetics / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000235:genetics* / Q000378:metabolism; D018106:CD28 Antigens / Q000235:genetics / Q000378:metabolism; D060908:CTLA-4 Antigen; D015331:Cohort Studies; D051858:Forkhead Transcription Factors / Q000235:genetics* / Q000378:metabolism; D020869:Gene Expression Profiling; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000378:metabolism; D006801:Humans; D016410:Lymphoma, T-Cell, Cutaneous / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000378:metabolism; D008840:Microfilament Proteins / Q000235:genetics* / Q000378:metabolism; D055655:NK Cell Lectin-Like Receptor Subfamily K; D009481:Neurophysins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011971:Receptors, Immunologic / Q000235:genetics / Q000378:metabolism; D055607:Receptors, Natural Killer Cell; D012751:Sezary Syndrome / Q000235:genetics / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology / Q000473:pathology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology / Q000473:pathology*
D015703:Antigens, CD; D051940:B7-2 Antigen; D014408:Biomarkers, Tumor; D018106:CD28 Antigens; C497964:CD86 protein, human; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D015395:Histocompatibility Antigens Class I; C527085:KLRK1 protein, human; C098080:MICB antigen; D008562:Membrane Glycoproteins; D008840:Microfilament Proteins; D055655:NK Cell Lectin-Like Receptor Subfamily K; D009481:Neurophysins; D012333:RNA, Messenger; D011971:Receptors, Immunologic; D055607:Receptors, Natural Killer Cell; C026742:plastin