4.6 Article

Over-Expression and Prognostic Significance of FN1, Correlating With Immune Infiltrates in Thyroid Cancer

期刊

FRONTIERS IN MEDICINE
卷 8, 期 -, 页码 -

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fmed.2021.812278

关键词

thyroid cancer; biomarker; FN1; immunity; survival

资金

  1. Collaborative Innovation Major Project of Zhengzhou [20XTZX08017]
  2. National Natural Science Foundation of China [82002433, 82002998]
  3. Science and Technology Project of Henan Provincial Department of Education [18A320044, 21A320036]
  4. Henan Province Medical Science and Technology Research Project Joint Construction Project [LHGJ20190003, LHGJ20190055, LHGJ20190042]
  5. First-class Postdoctoral Research Grant in Henan Province [201901007]
  6. Youth Talent Support Project of Henan Province [2021HYTP045]

向作者/读者索取更多资源

The expression levels of FN1 are correlated with prognosis and immune infiltration in THCA, suggesting that FN1 expression could be used as an immunity-related biomarker and therapeutic target in THCA.
BackgroundThyroid cancer (THCA) is a malignancy affecting the endocrine system, which currently has no effective treatment due to a limited number of suitable drugs and prognostic markers. MethodsThree Gene Expression Omnibus (GEO) datasets were selected to identify differentially expressed genes (DEGs) between THCA and normal thyroid samples using GEO2R tools of National Center for Biotechnology Information. We identified hub gene FN1 using functional enrichment and protein-protein interaction network analyses. Subsequently, we evaluated the importance of gene expression on clinical prognosis using The Cancer Genome Atlas (TCGA) database and GEO datasets. MEXPRESS was used to investigate the correlation between gene expression and DNA methylation; the correlations between FN1 and cancer immune infiltrates were investigated using CIBERSORT. In addition, we assessed the effect of silencing FN1 expression, using an in vitro cellular model of THCA. Immunohistochemical(IHC) was used to elevate the correlation between CD276 and FN1. ResultsFN1 expression was highly correlated with progression-free survival and moderately to strongly correlated with the infiltration levels of M2 macrophages and resting memory CD4+ T cells, as well as with CD276 expression. We suggest promoter hypermethylation as the mechanism underlying the observed changes in FN1 expression, as 20 CpG sites in 507 THCA cases in TCGA database showed a negative correlation with FN1 expression. In addition, silencing FN1 expression suppressed clonogenicity, motility, invasiveness, and the expression of CD276 in vitro. The correlation between FN1 and CD276 was further confirmed by immunohistochemical. ConclusionOur findings show that FN1 expression levels correlate with prognosis and immune infiltration levels in THCA, suggesting that FN1 expression be used as an immunity-related biomarker and therapeutic target in THCA.

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