ArticleCNS neuroscience & therapeutics2026
ANGPT2/Tie2 Enhances H3K18la-Mediated Macrophage M2 Polarization to Promote Endothelial Cell Proliferation in the Chronically Ischaemic Brain.
Article in CNS neuroscience & therapeutics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
aimsThis study aimed to investigate the specific mechanism by which angiopoietin-2 (ANGPT2)/Tie2 signaling in macrophages promotes endothelial cell (EC) proliferation in the chronically ischaemic brain (CIB).
methodsWe first analyzed the polarization status of primary Tie2-expressing macrophages (TEMs) and Tie2-overexpressing THP-1-derived macrophages (Tie2-TDMs) following ANGPT2 treatment and detected the expression of representative proangiogenic factors. Subsequently, lysine lactylation (Kla) levels were measured, and chromatin immunoprecipitation (ChIP) assays were performed to explore the downstream activity of ANGPT2/Tie2 signaling. Additionally, in vitro functional assays using human umbilical vein endothelial cells (HUVECs) and in vivo experiments in a rat model of chronic cerebral ischaemia were conducted to confirm the effect of ANGPT2/Tie2-regulated macrophages on angiogenesis.
resultsIn response to ANGPT2 treatment, the expression of M2 polarization markers and proangiogenic factors increased in TEMs and Tie2-TDMs. Concurrently, LDHA and H3K18la were elevated, and ChIP assays confirmed the regulatory role of ANGPT2/Tie2 signaling in H3K18la-mediated transcriptional regulation. The viability of HUVECs cocultured with Tie2-TDMs was increased. Finally, ANGPT2 overexpression increased M2-polarized TEM infiltration in the CIB; additionally, rats injected with ANGPT2-pretreated TEMs exhibited more prominent EC proliferation.
conclusionANGPT2/Tie2 induces the H3K18la-mediated M2 polarization of macrophages to facilitate EC proliferation and angiogenesis in the CIB.
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