CD47 (Cluster of differentiation 47): an anti-phagocytic receptor with a multitude of signaling functions

Pascal Leclair1, Chinten James Lim1

  • 1Department of Pediatrics, University of British Columbia, and, Michael Cuccione Childhood Cancer Research Program, B.C. Children's Hospital Research Institute, Vancouver, Canada.

Animal Cells and Systems
|November 23, 2020
PubMed

Insights

CD47 is a protein that helps tumors evade immune cells. This review explores how CD47 signaling causes cancer cell death, aiding new cancer therapies.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • CD47 functions as a tumor-evasive mechanism by interacting with phagocytes.
  • Emerging evidence highlights CD47's role as a signaling receptor in cellular processes.

Purpose of the Study:

  • To comprehensively review CD47 signaling pathways involved in tumor cell death.
  • To explore the therapeutic potential of targeting CD47 for cancer treatment.

Main Methods:

  • Literature review of studies on CD47 signaling.
  • Analysis of CD47's role in immune evasion and cell death pathways.

Main Results:

  • CD47 ligation triggers specific signaling cascades leading to cancer cell death.
  • Understanding these pathways is crucial for developing effective CD47-based therapies.

Conclusions:

  • Targeting CD47 can simultaneously disarm its immune-evasive function and induce direct tumor cell death.
  • This dual-action strategy holds promise for improved anti-cancer therapeutics.

Related Concept Videos

Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
Normal cells contain receptors that prevent them from being recognized...
4.4K
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
2.6K
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
7.3K
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.9K
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
7.4K
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
8.0K