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The COX-2/PGE2 pathway suppresses apical elimination of RasV12-transformed cells from epithelia.
Communications Biology ( IF 5.2 ) Pub Date : 2020-03-18 , DOI: 10.1038/s42003-020-0847-y
Nanami Sato 1 , Yuta Yako 1 , Takeshi Maruyama 1 , Susumu Ishikawa 1 , Keisuke Kuromiya 1 , Suzumi M Tokuoka 2 , Yoshihiro Kita 2, 3 , Yasuyuki Fujita 1
Affiliation  

At the initial stage of carcinogenesis, when RasV12-transformed cells are surrounded by normal epithelial cells, RasV12 cells are apically extruded from epithelia through cell competition with the surrounding normal cells. In this study, we demonstrate that expression of cyclooxygenase (COX)-2 is upregulated in normal cells surrounding RasV12-transformed cells. Addition of COX inhibitor or COX-2-knockout promotes apical extrusion of RasV12 cells. Furthermore, production of Prostaglandin (PG) E2, a downstream prostanoid of COX-2, is elevated in normal cells surrounding RasV12 cells, and addition of PGE2 suppresses apical extrusion of RasV12 cells. In a cell competition mouse model, expression of COX-2 is elevated in pancreatic epithelia harbouring RasV12-exressing cells, and the COX inhibitor ibuprofen promotes apical extrusion of RasV12 cells. Moreover, caerulein-induced chronic inflammation substantially suppresses apical elimination of RasV12 cells. These results indicate that intrinsically or extrinsically mediated inflammation can promote tumour initiation by diminishing cell competition between normal and transformed cells.

中文翻译:


COX-2/PGE2 途径抑制 RasV12 转化细胞从上皮细胞的顶端消除。



在癌变的初始阶段,当RasV12转化的细胞被正常上皮细胞包围时,RasV12细胞通过与周围正常细胞的细胞竞争而从上皮顶部挤出。在这项研究中,我们证明了 RasV12 转化细胞周围的正常细胞中环氧合酶 (COX)-2 的表达上调。添加 COX 抑制剂或 COX-2 敲除可促进 RasV12 细胞的顶端挤出。此外,在 RasV12 细胞周围的正常细胞中,前列腺素 (PG) E2(COX-2 的下游类前列腺素)的产生升高,并且添加 PGE2 可以抑制 RasV12 细胞的顶端挤出。在细胞竞争小鼠模型中,含有 RasV12 表达细胞的胰腺上皮细胞中 COX-2 的表达升高,并且 COX 抑制剂布洛芬促进 RasV12 细胞的顶端挤出。此外,雨伞素诱导的慢性炎症显着抑制RasV12细胞的顶端消除。这些结果表明内在或外在介导的炎症可以通过减少正常细胞和转化细胞之间的细胞竞争来促进肿瘤的发生。
更新日期:2020-03-19
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