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Inhibition of Microsomal Prostaglandin E Synthase-1 in Cancer-Associated Fibroblasts Suppresses Neuroblastoma Tumor Growth.
EBioMedicine 2018 June
Despite recent progress in diagnosis and treatment, survival for children with high-risk metastatic neuroblastoma is still poor. Prostaglandin E2 (PGE2 )-driven inflammation promotes tumor growth, immune suppression, angiogenesis and resistance to established cancer therapies. In neuroblastoma, cancer-associated fibroblasts (CAFs) residing in the tumor microenvironment are the primary source of PGE2 . However, clinical targeting of PGE2 with current non-steroidal anti-inflammatory drugs or cyclooxygenase inhibitors has been limited due to risk of adverse side effects. By specifically targeting microsomal prostaglandin E synthase-1 (mPGES-1) activity with a small molecule inhibitor we could block CAF-derived PGE2 production leading to reduced tumor growth, impaired angiogenesis, inhibited CAF migration and infiltration, reduced tumor cell proliferation and a favorable shift in the M1/M2 macrophage ratio. In this study, we provide proof-of-principle of the benefits of targeting mPGES-1 in neuroblastoma, applicable to a wide variety of tumors. This non-toxic single drug treatment targeting infiltrating stromal cells opens up for combination treatment options with established cancer therapies.
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