COX2 regulates senescence secretome composition and senescence surveillance through PGE 2

Senescent cells trigger their own immune-mediated destruction, termed senescence surveillance. This is dependent on the inflammatory senescence-associated secretory phenotype (SASP), which includes COX2, an enzyme with complex roles in cancer. The role COX2 plays during senescence surveillance is un...

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Bibliographic Details
Published in:Cell reports (Cambridge) 2021-03, Vol.34 (11), p.108860
Main Authors: Gonçalves, Susana, Yin, Kelvin, Ito, Yoko, Chan, Adelyne, Olan, Ioana, Gough, Sarah, Cassidy, Liam, Serrao, Eva, Smith, Stephen, Young, Andrew, Narita, Masashi, Hoare, Matthew
Format: Article
Language:English
Subjects:
Animals
Cellular Senescence
Cyclooxygenase 2 - metabolism
Cyclooxygenase 2 Inhibitors - pharmacology
Dinoprostone - metabolism
Female
Fibroblasts
Humans
Mice, Inbred C57BL
Receptors, Prostaglandin E, EP4 Subtype - metabolism
Secretome
Senescence-Associated Secretory Phenotype
Tumor Microenvironment - immunology
Up-Regulation
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Summary:Senescent cells trigger their own immune-mediated destruction, termed senescence surveillance. This is dependent on the inflammatory senescence-associated secretory phenotype (SASP), which includes COX2, an enzyme with complex roles in cancer. The role COX2 plays during senescence surveillance is unknown. Here, we show that during RAS-induced senescence (RIS), COX2 is a critical regulator of SASP composition and senescence surveillance in vivo. COX2 regulates the expression of multiple inflammatory SASP components through an autocrine feedback loop involving its downstream product, prostaglandin E2 (PGE ), binding to EP4. During in vivo hepatocyte RIS, Cox2 is critical to tumor suppression, Cxcl1 expression, and immune-mediated senescence surveillance, partially through PGE . Loss of Cox2 in RIS dysregulates the intrahepatic immune microenvironment, with enrichment of immunosuppressive immature myeloid cells and CD4 regulatory T lymphocytes. Therefore, COX2 and PGE play a critical role in senescence, shaping SASP composition, promoting senescence surveillance and tumor suppression in the earliest stages of tumorigenesis.
ISSN:2211-1247