Immune suppression in head and neck cancers: a review

Anaëlle Duray, Stéphanie Demoulin, Pascale Hubert, Philippe Delvenne, Sven Saussez, Anaëlle Duray, Stéphanie Demoulin, Pascale Hubert, Philippe Delvenne, Sven Saussez

Abstract

Head and neck squamous cell carcinomas (HNSCCs) are the sixth most common cancer in the world. Despite significant advances in the treatment modalities involving surgery, radiotherapy, and concomitant chemoradiotherapy, the 5-year survival rate remained below 50% for the past 30 years. The worse prognosis of these cancers must certainly be link to the fact that HNSCCs strongly influence the host immune system. We present a critical review of our understanding of the HNSCC escape to the antitumor immune response such as a downregulation of HLA class I and/or components of APM. Antitumor responses of HNSCC patients are compromised in the presence of functional defects or apoptosis of T-cells, both circulating and tumor-infiltrating. Langerhans cells are increased in the first steps of the carcinogenesis but decreased in invasive carcinomas. The accumulation of macrophages in the peritumoral areas seems to play a protumoral role by secreting VEGF and stimulating the neoangiogenesis.

Figures

Figure 1
Figure 1
Immunosuppressive mechanisms in the tumor microenvironment: several mechanisms are developed by cancerous cells to escape to the immune system such as a loss or a reduction of the expression of MHC class 1 molecules and costimulatory molecules, the expression of FasL to induce apoptosis of tumor-infiltrating lymphocytes and the production of immunosuppressive molecules such as TGF-β, PGE2, IL-6, IL-10, and adenosine. Among the subpopulations of naïve CD4+ T cells, CD4+ Th17 T cells promote inflammation by secreting IL-17 whereas CD4+ Th2 T cells promote antibody production by B cells. Tregs promote tumor progression by inhibiting the functions of CD4+ and CD8+ T cells and NK cells. TAMs M2 phenotype induce the expression of CD4+ Th2 T cell and Tregs. Moreover, M2 phenotype promote growth tumor (EGF, PDGF, TGF-β, IL-6, IL-1, and TNF-α), angiogenesis (TGF-β, VEGF, GM-CSF, TGF-α, IL-1, IL-6, and IL-8), invasion (MMPs, TNF-α, IL-1), immunosuppression (TGF-β, PGE2, and IL-10) and metastasis. MDSCs induce Treg, secrete IL-10, and inhibit CD4+ and CD8+ T cells.
Figure 2
Figure 2
Description of immunosuppressive mechanisms during the head and neck tumor progression: in the normal epithelia of the upper aerodigestive tracts, LCs are present in the suprabasal layers. When mucosae of these areas are exposed to tobacco, the number of LCs increases whereas these cells decrease in invasive carcinomas. The mature DCs are prominent in the peritumoral area and correlated positively with the expression of VEGF. DCs are also more abundant in patients with metastasis. A higher level of TAM is observed in HNSCCs, and these cells constitute a source of VEGF which play a crucial role in angiogenesis. HNSCCs can induce the apoptosis of CD8+ T cells using the mitochondrial and/or Fas/FasL pathways. Tregs can induce apoptosis of CD8+ T cells and inhibition of the proliferation of CD4+ T cells.

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Source: PubMed

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