m6A modification-dependent upregulation of WNT2 facilitates M2-like macrophage polarization and perpetuates malignant progression of nasopharyngeal carcinoma.

The development and progression of nasopharyngeal carcinoma (NPC) involves intricate interactions between tumor cells and other surrounding cells in the tumor microenvironment (TME). Tumor-associated macrophages (TAMs) play pivotal roles in the progression of NPC, but their interactions remain largely unexplored. In this study, we revealed that NPC promoted M2-like polarization of TAMs through enhanced synthesis and secretion of WNT2. These M2-type macrophages, in turn, significantly boosted the proliferation and metastasis of NPC. This vicious cycle perpetuated the malignant progression of NPC. Mechanistically, elevated m6A modification of WNT2 in NPC stabilized its mRNA and facilitated its protein expression, which is coordinately regulated by the m6A "eraser" ALKBH5 and the "reader" YTHDF1. NPC promoted M2-like polarization of macrophages by activating the FZD2/β-catenin signaling axis through paracrine WNT2. Furthermore, elevated WNT2 can also trigger the WNT/β-catenin signaling pathway in NPC cells through autocrine signaling, synergically contributing to NPC development. The research reveals that WNT2 is upregulated in an m6A modification-dependent manner and promotes M2-like macrophages polarization of TAMs and malignant progression of NPC. This discovery provides novel potential molecular markers and therapeutic targets for the diagnosis and treatment of NPC.