Immunomodulatory role of Keratin 76 in oral and gastric cancer

Inês Sequeira, Joana F. Neves, Dido Carrero, Qi Peng, Natalia Palasz, Kifayathullah Liakath-Ali, Graham M. Lord, Peter R. Morgan, Giovanna Lombardi and Fiona M. Watt ()
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Inês Sequeira: King’s College London, Guy’s Hospital
Joana F. Neves: King’s College London, Guy’s Hospital
Dido Carrero: King’s College London, Guy’s Hospital
Qi Peng: King’s College London, Guy’s Hospital
Natalia Palasz: King’s College London, Guy’s Hospital
Kifayathullah Liakath-Ali: King’s College London, Guy’s Hospital
Graham M. Lord: King’s College London, Guy’s Hospital
Peter R. Morgan: King’s College London, Guy’s Hospital
Giovanna Lombardi: King’s College London, Guy’s Hospital
Fiona M. Watt: King’s College London, Guy’s Hospital

Nature Communications, 2018, vol. 9, issue 1, 1-15

Abstract: Abstract Keratin 76 (Krt76) is expressed in the differentiated epithelial layers of skin, oral cavity and squamous stomach. Krt76 downregulation in human oral squamous cell carcinomas (OSCC) correlates with poor prognosis. We show that genetic ablation of Krt76 in mice leads to spleen and lymph node enlargement, an increase in regulatory T cells (Tregs) and high levels of pro-inflammatory cytokines. Krt76−/− Tregs have increased suppressive ability correlated with increased CD39 and CD73 expression, while their effector T cells are less proliferative than controls. Loss of Krt76 increases carcinogen-induced tumours in tongue and squamous stomach. Carcinogenesis is further increased when Treg levels are elevated experimentally. The carcinogenesis response includes upregulation of pro-inflammatory cytokines and enhanced accumulation of Tregs in the tumour microenvironment. Tregs also accumulate in human OSCC exhibiting Krt76 loss. Our study highlights the role of epithelial cells in modulating carcinogenesis via communication with cells of the immune system.

Date: 2018
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DOI: 10.1038/s41467-018-05872-4

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