What question did this study set out to answer?

To determine the molecular mechanisms underlying the reduced susceptibility of metastatic melanoma cells to cytotoxic T-lymphocyte (CTL)-mediated lysis compared to primary melanoma cells.

December 1, 2008Cancer Research

ICAM-1 Has a Critical Role in the Regulation of Metastatic Melanoma Tumor Susceptibility to CTL Lysis by Interfering with PI3K/AKT Pathway

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Authors

AHAhmed HamaïCentre National de la Recherche Scientifique FMFranck MeslinInserm HBHoussem BenlalamCentre National de la Recherche Scientifique

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Implication

Experimental study demonstrates that ICAM-1 loss confers cytotoxic T lymphocyte resistance via PI3K/AKT signaling in metastatic melanoma, revealing a key immune evasion mechanism.

Key Points

To determine the molecular mechanisms underlying the reduced susceptibility of metastatic melanoma cells to cytotoxic T-lymphocyte (CTL)-mediated lysis compared to primary melanoma cells.
Compared primary (T1) and metastatic (G1) human melanoma cell models for susceptibility to lysis by Melan-A/MART-1-specific CTLs (clone LT12).
Evaluated antigen presentation, immunological synapse formation, granzyme B polarization, and expression of PI-9 and ICAM-1 using gene knockdown and cell sorting.
Assessed PTEN phosphorylation, AKT activation, and the effect of PI3K inhibition using wortmannin on CTL-mediated lysis.
Metastatic G1 cells showed markedly reduced ICAM-1 expression relative to T1 cells, whereas ICAM-1+ G1 cells and IFN-gamma-treated G1 cells showed restored sensitivity to CTL-mediated lysis.
ICAM-1 knockdown in primary T1 cells induced PTEN phosphorylation, activated AKT, and promoted resistance to CTL-mediated killing without altering immunological synapse formation or granzyme B polarization.
Inhibition of PI3K/AKT signaling with wortmannin significantly enhanced susceptibility to CTL lysis in metastatic G1 cells and ICAM-1-silenced T1 cells.

Cite This Study

Hamaï et al. (2008) studied this question.

synapsesocial.com/papers/6a129337bb918b6e5b67a115 https://doi.org/10.1158/0008-5472.can-08-0719

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Implication

Experimental study demonstrates that ICAM-1 loss confers cytotoxic T lymphocyte resistance via PI3K/AKT signaling in metastatic melanoma, revealing a key immune evasion mechanism.

ICAM-1 Has a Critical Role in the Regulation of Metastatic Melanoma Tumor Susceptibility to CTL Lysis by Interfering with PI3K/AKT Pathway

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Implication

Key Points

Cite This Study

ICAM-1 Has a Critical Role in the Regulation of Metastatic Melanoma Tumor Susceptibility to CTL Lysis by Interfering with PI3K/AKT Pathway

Discussion

Member takes

Implication

Key Points

Cite This Study

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