Thyroxine inhibits resveratrol-caused apoptosis by PD-L1 in ovarian cancer cells.
Endocr Relat Cancer
; 25(5): 533-545, 2018 05.
Article
em En
| MEDLINE
| ID: mdl-29555649
ABSTRACT
Thyroid hormone, l-thyroxine (T4), has been shown to promote ovarian cancer cell proliferation via a receptor on plasma membrane integrin αvß3 and to induce the activation of ERK1/2 and expression of programmed death-ligand 1 (PD-L1) in cancer cells. In contrast, resveratrol binds to integrin αvß3 at a discrete site and induces p53-dependent antiproliferation in malignant neoplastic cells. The mechanism of resveratrol action requires nuclear accumulation of inducible cyclooxygenase (COX)-2 and its complexation with phosphorylated ERK1/2. In this study, we examined the mechanism by which T4 impairs resveratrol-induced antiproliferation in human ovarian cancer cells and found that T4 inhibited resveratrol-induced nuclear accumulation of COX-2. Furthermore, T4 increased expression and cytoplasmic accumulation of PD-L1, which in turn acted to retain inducible COX-2 in the cytoplasm. Knockdown of PD-L1 by small hairpin RNA (shRNA) relieved the inhibitory effect of T4 on resveratrol-induced nuclear accumulation of COX-2- and COX-2/p53-dependent gene expression. Thus, T4 inhibits COX-2-dependent apoptosis in ovarian cancer cells by retaining inducible COX-2 with PD-L1 in the cytoplasm. These findings provide new insights into the antagonizing effect of T4 on resveratrol's anticancer properties.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Ovarianas
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Tiroxina
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Apoptose
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Antígeno B7-H1
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Resveratrol
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article