Abstract:
:Macrophages can be polarized into the inflammatory M1 lineage or the immunomodulatory M2 lineage, depending on the differential tissue microenvironment signaling, specific pathogens or cytokine stimulation. Tumor necrosis factor α‑induced protein 8‑like protein 2 (TIPE2) has been demonstrated to negatively regulate inflammation by inhibiting the Toll‑like receptor (TLR) pathway. The present study utilized murine bone marrow derived macrophages (BMDMs) as the model of undifferentiated (M0) macrophages to study the roles of TIPE2 in the differential polarization status of BMDMs. It was observed that the expression levels of TIPE2 were diminished in M1 macrophages treated with lipopolysaccharide/interferon γ, and elevated in M2 macrophages treated with interleukin (IL)‑4. BMDMs with TIPE2 overexpression exhibited defective M1 polarization and enhanced responses to IL‑4 stimulation. TIPE2 impeded M1 polarization by interfering with mitogen‑activated protein kinase kinase kinase 7‑inhibitor of nuclear factor‑κB kinase subunit β and B cell receptor‑associated protein‑serine/threonine‑protein kinase mTOR complex 1 (mTORC1) activation. TIPE2 overexpression accelerated IL‑4 induced M2 polarization by dampening mTORC1 activation via the accelerated process of arginine to urea. Overall, these results define a key role for TIPE2 in macrophage polarization by impeding mTORC1 response.
journal_name
Mol Med Repjournal_title
Molecular medicine reportsauthors
Jiang Y,Li Q,Zhang Y,Gao Y,Jiang L,Chen Zdoi
10.3892/mmr.2017.7991subject
Has Abstractpub_date
2018-01-01 00:00:00pages
952-960issue
1eissn
1791-2997issn
1791-3004journal_volume
17pub_type
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