The emergence of immune checkpoint inhibitors has dramatically changed the therapeutic landscape for patients with advanced melanoma. However, relatively low response rates and a high incidence of severe immune-related adverse events have prompted the search for predictive biomarkers. A positive predictive value has been attributed to the aberrant expression of Human Leukocyte Antigen-DR (HLA-DR) by melanoma cells, but it remains unknown why this is the case. In this study, we have examined the microenvironment of HLA-DR positive metastatic melanoma samples using a multi-omics approach. First, using spatial, single-cell mapping by multiplexed immunohistochemistry, we found that the microenvironment of HLA-DR positive melanoma regions was enriched by professional antigen presenting cells, including classical dendritic cells and macrophages, while a more general cytotoxic T cell exhaustion phenotype was present in these regions. In parallel, transcriptomic analysis on micro dissected tissue from HLA-DR positive and HLA-DR negative areas showed increased IFNγ signaling, enhanced leukocyte adhesion and mononuclear cell proliferation in HLA-DR positive areas. Finally, multiplexed cytokine profiling identified an increased expression of germinal center cytokines CXCL12, CXCL13 and CCL19 in HLA-DR positive metastatic lesions, which, together with IFNγ and IL4 could serve as biomarkers to discriminate tumor samples containing HLA-DR overexpressing tumor cells from HLA-DR negative samples. Overall, this suggests that HLA-DR positive areas in melanoma attract the anti-tumor immune cell infiltration by creating a dystrophic germinal center-like microenvironment where an enhanced antigen presentation leads to an exhausted microenvironment, nevertheless representing a fertile ground for a better efficacy of anti-PD-1 inhibitors due to simultaneous higher levels of PD-1 in the immune cells and PD-L1 in the HLA-DR positive melanoma cells.
Gadeyne, L., Van Herck, Y., Milli, G., Atak, Z., Bolognesi, M., Wouters, J., et al. (2021). A Multi-Omics Analysis of Metastatic Melanoma Identifies a Germinal Center-Like Tumor Microenvironment in HLA-DR-Positive Tumor Areas. FRONTIERS IN ONCOLOGY, 11(25 March 2021).
|Citazione:||Gadeyne, L., Van Herck, Y., Milli, G., Atak, Z., Bolognesi, M., Wouters, J., et al. (2021). A Multi-Omics Analysis of Metastatic Melanoma Identifies a Germinal Center-Like Tumor Microenvironment in HLA-DR-Positive Tumor Areas. FRONTIERS IN ONCOLOGY, 11(25 March 2021).|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||Si|
|Titolo:||A Multi-Omics Analysis of Metastatic Melanoma Identifies a Germinal Center-Like Tumor Microenvironment in HLA-DR-Positive Tumor Areas|
|Autori:||Gadeyne, L; Van Herck, Y; Milli, G; Atak, Z; Bolognesi, M; Wouters, J; Marcelis, L; Minia, A; Pliaka, V; Roznac, J; Alexopoulos, L; Cattoretti, G; Bechter, O; Oord, J; De Smet, F; Antoranz, A; Bosisio, F|
BOLOGNESI, MADDALENA MARIA [Membro del Collaboration Group]
CATTORETTI, GIORGIO [Membro del Collaboration Group]
BOSISIO, FRANCESCA MARIA (Corresponding)
|Data di pubblicazione:||2021|
|Rivista:||FRONTIERS IN ONCOLOGY|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3389/fonc.2021.636057|
|Appare nelle tipologie:||01 - Articolo su rivista|