Abstract:
:The presence of immunosuppressive macrophages that become activated in the tumor microenvironment constitutes a major factor responsible for tumor growth and malignancy. In line with this knowledge, we report here that macrophage proliferation is a significant feature of advanced stages of cancer. Moreover, we have found that a high proportion of proliferating macrophages in human tumors express ERK5. ERK5 was required for supporting the proliferation of macrophages in tumor grafts in mice. Furthermore, myeloid ERK5 deficiency negatively impacted the proliferation of both resident and infiltrated macrophages in metastatic lung nodules. ERK5 maintained the capacity of macrophages to proliferate by suppressing p21 expression to halt their differentiation program. Collectively, these data provide insight into the mechanism underpinning macrophage proliferation to support malignant tumor development, thereby strengthening the value of ERK5-targeted therapies to restore antitumor immunity through the blockade of protumorigenic macrophage activation. SIGNIFICANCE: These findings offer a new rationale for anti-ERK5 therapy to improve cancer patient outcomes by blocking the proliferative activity of tumor macrophages.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Giurisato E,Lonardi S,Telfer B,Lussoso S,Risa-Ebrí B,Zhang J,Russo I,Wang J,Santucci A,Finegan KG,Gray NS,Vermi W,Tournier Cdoi
10.1158/0008-5472.CAN-19-2416subject
Has Abstractpub_date
2020-08-15 00:00:00pages
3319-3330issue
16eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-19-2416journal_volume
80pub_type
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