Title:Tumor-selective Blockade of CD47 Signaling with CD47 Antibody for
Enhanced Anti-tumor Activity in Malignant Meningioma
Volume: 21
Issue: 10
Author(s): Xiaotong Liu, Huarong Zhang, Chaohu Wang, Zhiyong Li, Qianchao Zhu, Yiwen Feng, Jun Fan, Songtao Qi*, Zhiyong Wu*Yi Liu*
Affiliation:
- Department of Neurosurgery, Nanfang Hospital,
Southern Medical University, Guangzhou, Guangdong, China
- College of Traditional Chinese Medicine, Southern
Medical University, Guangzhou, Guangdong, China
- Department of Neurosurgery, Nanfang Hospital,
Southern Medical University, Guangzhou, Guangdong, China
Keywords:
Malignant meningioma, CD47, immune escape, EMT, targeted therapy, macrophages.
Abstract:
Background: Patients with WHO grade III meningioma have a poor prognosis with a median
survival of less than two years and a high risk of recurrence. However, traditional treatment options
have failed to improve prognosis. Therefore, development of novel immunotherapy targets is urgently
needed. CD47 acting as a “don't eat me” signal to macrophages can trigger tumor immune escape.
However, the role of CD47 in malignant meningioma is not well understood.
Methods: We collected 190 clinical meningioma samples and detected the expression of CD47 and
immune infiltration in WHO grade I-III by immunohistochemistry, western blot, qPCR. We also examined
the functional effects of anti-CD47 on cell proliferation, migration and invasion, macrophagemediated
phagocytosis and tumorigenicity both in vitro and in vivo.
Results: We found that the expression of CD47 was increased in malignant meningioma along with a
decreased number of T cells and an increase in CD68+ macrophages. Blocking CD47 with anti-CD47
antibody (B6H12) suppressed tumor cell growth, motility and promoted macrophage-mediated phagocytosis
in IOMM-Lee cells in vitro. In vivo experiments showed that anti-CD47 antibody (B6H12 or
MIAP301) significantly inhibited the tumor growth and this effect was partly blocked by the depletion
of macrophages. Finally, p-ERK and EGFR showed higher expression in malignant meningioma with
high expression of CD47, which was verified by western blot.
Conclusion: Our results demonstrated that CD47 maybe involved in the meningioma progression and
prognosis and offered a novel therapeutic option by targeting CD47 in malignant meningioma.