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Tissue Homing and Persistence of Defined Antigen-Specific CD8+ Tumor-Reactive T- Cell Clones in Long-Term Melanoma Survivors  Frédérique-Anne Le Gal, Valérie.

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Presentation on theme: "Tissue Homing and Persistence of Defined Antigen-Specific CD8+ Tumor-Reactive T- Cell Clones in Long-Term Melanoma Survivors  Frédérique-Anne Le Gal, Valérie."— Presentation transcript:

1 Tissue Homing and Persistence of Defined Antigen-Specific CD8+ Tumor-Reactive T- Cell Clones in Long-Term Melanoma Survivors  Frédérique-Anne Le Gal, Valérie M. Widmer, Valérie Dutoit, Verena Rubio-Godoy, Jacques Schrenzel, Paul R. Walker, Pedro J. Romero, Danila Valmori, Daniel E. Speiser, Pierre-Yves Dietrich  Journal of Investigative Dermatology  Volume 127, Issue 3, Pages (March 2007) DOI: /sj.jid Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

2 Figure 1 Ex vivo detection of MAGE-A10-specific T-cell clones 15 and 6D1 in peripheral blood and tissues along the clinical course of patients LAU 50 and LAU 155. (a) Schematic representation of the clinical course of patients LAU 50 (left panel) and LAU 155 (right panel). (b) Quantification of the transcripts of clonotype 15 (left panel) and clonotype 6D1 (right panel) in peripheral CD8+ T cells by real-time quantitative reverse transcriptase-PCR. Values are shown as the ratio of the calibrated expression of the CDR3 transcripts normalized to the expression of the TRBC transcripts. SDs of replicates were inferior to 2.5% of the value for each time point. Background level is illustrated. Available tissues (indicated by symbols) were also investigated for the presence of clonotypes 15 (left panel) and 6D1 (right panel). Journal of Investigative Dermatology  , DOI: ( /sj.jid ) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

3 Figure 2 Longitudinal TCR repertoire analysis of MAGE-A10254–262-specific CD8+ T cells. After 2 weeks of in vitro stimulation with peptide MAGE-A10254–262, LAU 50 and LAU 155 MAGE-A10 CD8+-specific T cells were sorted and their TCR β-chain V segment usage and CDR3 length were assessed by spectratyping. Total RNA was extracted from each sample, reversed transcribed, and amplified by PCR using BV and BC primers. Amplimers were copied by a fluorescent BC primer in a run off reaction and subjected to electrophoresis on an automated sequencer. The curves obtained show the size and intensity distribution of in-frame BV–BC amplification products. BV4 and BV13 are representative of most of the longitudinal repertoire (i.e. no amplification, inconstant isolated peaks of various sizes, and oligoclonal profiles). Only BV21 products displayed peaks of the same size recurring at each time point. BV21 transcripts were sequenced after molecular cloning. The occurrence of the sequences is indicated. Journal of Investigative Dermatology  , DOI: ( /sj.jid ) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

4 Figure 3 Detection of clone 6D1 in liver samples before and after chemo-immunotherapy. Left panels: CD8 staining in a needle biopsy of melanoma liver metastasis before biochemotherapy in 1994 (upper row) and in a tumor-free piece of liver excised after biochemotherapy in 1995 (lower row), showing persistent lymphocytic infiltrate (L.I.) predominant in the cicatricial nodule. Sections (5μm) of paraffin-embedded tissue have been stained with an anti-CD8 mAb and counterstained with hemalun. Original magnification × 100. Bar=0.25mm. Right panels: real-time quantitative reverse transcriptase-PCR detection of clonotype 6D1 in the related tissue samples. Total RNA was extracted and reverse transcribed with an oligodT primer (frozen tissue 1995) or with a BV21-specific primer (fixed tissue 1994). cDNA was assayed in duplicate using probe/primer set specific for the clonotype. CT values were superior to 40 for no template controls (NTC). Journal of Investigative Dermatology  , DOI: ( /sj.jid ) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

5 Figure 4 Differentiation phenotype of clone 15. (a) Dot plots from PBMCs of patient LAU 50, stained with CD8, CD3, CD45RA, and CCR7. A total of 105 cells from each of the four CD8+ T-cell sub-populations were sorted for further analysis in qRT-PCR. A representative example of two cell sorting experiments performed on the PBMC sample from May 2003 is shown. Each of the four CD8+ T-cell sub-populations was sorted and analyzed in qRT-PCR. (b) Quantification of clonotype 15 transcripts was performed in the four ex vivo CD8+ T-cell sub-populations sorted based on CD45RA and CCR7 expression and defined as effector (CD45RAhigh CCR7−), effector memory (CD45RAlow CCR7−), central memory (CD45RAlow CCR7+), and naive (CD45RAhigh CCR7+) (Sallusto et al., 1999). Data are the mean±SD of three experiments. Journal of Investigative Dermatology  , DOI: ( /sj.jid ) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

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