Metformin suppresses esophageal cancer progression through the radiationinduced cellular senescence of cancerassociated fibroblasts.
Oncol Rep
; 52(4)2024 Oct.
Article
em En
| MEDLINE
| ID: mdl-39092576
ABSTRACT
Senescent cells are known to secrete proteins, including inflammatory cytokines and damageassociated molecular patterns. This phenomenon is known as the senescenceassociated secretory phenotype (SASP). SASP in cancer stromal fibroblasts is involved in cancer growth and progression. Conversely, metformin, an antidiabetic drug, has been reported to inhibit SASP induction by inhibiting the activation of NFκB, a regulator of SASP. To date, at least to the best of our knowledge, there have been no reports regarding cellular senescence in fibroblasts and tumor progression via the SASPmediated paracrine pathway. The present study thus aimed to elucidate the induction mechanisms of SASP in radiationinduced fibroblasts and to determine its effects on cancer progression via the paracrine pathway. Furthermore, the present study aimed to determine whether controlling SASP using metformin suppresses cancer progression. A welldifferentiated esophageal cancer cell line established by the authors' department and fibroblasts isolated and cultured from the noncancerous esophageal mucosa of resected esophageal cancer cases were used for the experiments. Fibroblasts were irradiated with 8 Gy radiation, and the changes in the expression of the senescence markers, SAßgal, p21, p16 and NFκB were evaluated using immunofluorescent staining and western blot analysis in the presence or absence of metformin treatment. The culture supernatants of irradiated fibroblasts treated with metformin and those treated without metformin were collected and added to the cancer cells to evaluate their proliferative, invasive and migratory abilities. Vimentin and Ecadherin expression levels were also evaluated using immunofluorescent staining and western blot analysis. The expression levels of p16, p21 and NFκB in irradiated fibroblasts were attenuated by treatment with metformin. Supernatants collected from irradiated fibroblasts exhibited the proliferative activity of esophageal cancer cells, and the promotion of migratory and invasion abilities, which may be due to epithelialmesenchymal transition and changes in cell morphology. These reactions were confirmed to be suppressed by the addition of the supernatant of cultured fibroblasts pretreated with metformin. On the whole, the present study demonstrates that fibroblasts in the cancer stroma may be involved in tumor progression through cellular senescence.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Esofágicas
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Senescência Celular
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Proliferação de Células
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Fibroblastos Associados a Câncer
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Metformina
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article