4.6 Article

Effects of checkpoint kinase 1 inhibition by prexasertib on the tumor immune microenvironment of head and neck squamous cell carcinoma

期刊

MOLECULAR CARCINOGENESIS
卷 60, 期 2, 页码 138-150

出版社

WILEY
DOI: 10.1002/mc.23275

关键词

gene expression; head and neck squamous cell carcinoma (HNSCC); multiplex immunohistochemical staining; prexasertib; tumor immune microenvironment

资金

  1. National Cancer Institute [P30-CA076292]
  2. Eli Lilly and Company
  3. James and Esther King Biomedical Research [7JK02]

向作者/读者索取更多资源

Prexasertib shows potential therapeutic effects in HNSCC, but long-term resistance may be related to evasion of immune surveillance. Genetics and immunohistochemistry analyses suggest significant impact of Prexasertib on the tumor immune microenvironment.
Prognosis for patients with recurrent and/or metastatic head and neck squamous cell carcinoma (HNSCC) remains poor. Development of more effective and less toxic targeted therapies is necessary for HNSCC patients. Checkpoint kinase 1 (CHK1) plays a vital role in cell cycle regulation and is a promising therapeutic target in HNSCC. Prexasertib, a CHK1 inhibitor, induces DNA damage and cell death, however, its effect on the tumor immune microenvironment (TIME) is largely unknown. Therefore, we evaluated a short-term and long-term effects of prexasertib in HNSCC and its TIME. Prexasertib caused increased DNA damage and cell death in vitro and significant tumor regression and improved survival in vivo. The gene expression and multiplex immunohistochemistry (mIHC) analyses of the in vivo tumors demonstrated increased expression of genes that are related to T-cell activation and increased immune cell trafficking, and decreased expression of genes that related to immunosuppression. However, increased expression of genes related to immunosuppression emerged over time suggesting evasion of immune surveillances. These findings in gene expression analyses were confirmed using mIHC which showed differential modulation of TIME in the tumor margins and as well as cores over time. These results suggest that evasion of immune surveillance, at least in part, may contribute to the acquired resistance to prexasertib in HNSCC.

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