Thyroid hormone-induced expression of inflammatory cytokines interfere with resveratrol-induced anti-proliferation of oral cancer cells

Food Chem Toxicol. 2019 Oct:132:110693. doi: 10.1016/j.fct.2019.110693. Epub 2019 Jul 20.

Abstract

Thyroid hormone, L-thyroxine (T4), induces inflammatory genes expressions and promotes cancer growth. It also induces expression of the checkpoint programmed death-ligand 1 (PD-L1), which plays a vital role in cancer progression. On the other hand, resveratrol inhibits inflammatory genes expressions. Moreover, resveratrol increases nuclear inducible cyclooxygenase (COX)-2 accumulation, complexes with p53, and induces p53-dependent anti-proliferation. In this study, we investigated the effect of T4 on resveratrol-induced anti-proliferation in oral cancer. T4 increased the expression and cytoplasmic accumulation of PD-L1. Increased expressions of pro-inflammatory genes, interleukin (IL)-1β and transforming growth factor (TGF)-β1, were shown to stimulate PD-L1 expression. T4 stimulated pro-inflammatory and proliferative genes expressions, and oral cancer cells proliferation. In contrast, resveratrol inhibited those genes and activated anti-proliferative genes. T4 retained resveratrol-induced COX-2 in cytoplasm and prevented COX-2 nuclear accumulation when resveratrol treated cancer cells. A specific signal transducer and activator of transcription 3 (STAT3) inhibitor, S31-201, blocked T4-induced inhibition and restored resveratrol-induced nuclear COX-2 accumulation. By inhibiting the T4-activated STAT3 signal transduction axis with S31-201, resveratrol was able to sequentially reestablish COX-2/p53-dependent gene expressions and anti-proliferation. These findings provide a novel understanding of the inhibitory effects of T4 on resveratrol-induced anticancer properties via the sequential expression of PD-L1 and inflammatory genes.

Keywords: Inflammation; L-thyroxine; Oral cancer; PD-L1; Resveratrol.

MeSH terms

  • Cell Line, Tumor
  • Cell Nucleus / drug effects
  • Cell Nucleus / enzymology
  • Cell Proliferation / drug effects*
  • Cyclooxygenase 2 / metabolism
  • Cytokines / genetics*
  • Gene Expression / drug effects*
  • Humans
  • Inflammation Mediators / metabolism*
  • Mouth Neoplasms / metabolism
  • Mouth Neoplasms / pathology*
  • Resveratrol / pharmacology*
  • STAT3 Transcription Factor / metabolism
  • Thyroxine / pharmacology*

Substances

  • Cytokines
  • Inflammation Mediators
  • STAT3 Transcription Factor
  • STAT3 protein, human
  • Cyclooxygenase 2
  • Resveratrol
  • Thyroxine