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Phagocytosis and Immune Regulation
Research Guide
What is Phagocytosis and Immune Regulation?
Phagocytosis and immune regulation refers to the mechanisms by which phagocytes recognize, engulf, and clear apoptotic cells through processes like efferocytosis, involving molecules such as CD47, TAM receptors, and phosphatidylserine, which maintain immune homeostasis and have implications for cancer immunotherapy.
This field encompasses 30,830 papers on apoptotic cell clearance and its regulation by phagocytes. Key processes include efferocytosis mediated by phosphatidylserine exposure and receptors like TAM family members. Macrophages exhibit plasticity, polarizing into pro-inflammatory M1 or anti-inflammatory M2 subsets that influence phagocytosis and immune responses.
Topic Hierarchy
Research Sub-Topics
Efferocytosis Mechanisms in Apoptotic Cell Clearance
This sub-topic investigates the specialized phagocytic process of efferocytosis, including recognition signals like phosphatidylserine and engulfment by macrophages. Researchers study molecular pathways, receptors, and regulatory factors that ensure efficient clearance without inflammation.
Role of CD47 in Phagocytosis Regulation
This sub-topic examines CD47-SIRPα signaling as an inhibitory 'don't eat me' pathway that prevents phagocytosis of healthy and cancer cells. Researchers explore blocking antibodies and their effects on enhancing phagocytic clearance in immunotherapy contexts.
TAM Receptors in Efferocytosis
This sub-topic focuses on Tyro3, Axl, and Mer (TAM) receptor tyrosine kinases in bridging apoptotic cells to phagocytes via ligands like Gas6 and Protein S. Researchers analyze TAM signaling in anti-inflammatory responses and tissue homeostasis.
Phosphatidylserine Exposure in Phagocyte Recognition
This sub-topic studies the externalization of phosphatidylserine (PS) on apoptotic cells as an 'eat me' signal recognized by PS receptors like TIM-4 and BAI1. Researchers investigate PS-binding proteins and their roles in phagocytic specificity.
Phagocytosis in Cancer Immunotherapy
This sub-topic explores enhancing tumor cell phagocytosis through blockade of inhibitory signals and activation of pro-phagocytic pathways in macrophages and dendritic cells. Researchers evaluate combination therapies with checkpoint inhibitors for improved anti-tumor responses.
Why It Matters
Phagocytosis of apoptotic cells prevents inflammation and autoimmunity by ensuring timely clearance, as disruptions contribute to diseases like cancer and atherosclerosis. In cancer immunotherapy, blocking CD47 on tumor cells enhances macrophage-mediated phagocytosis, improving tumor clearance. Macrophage polarization into M1 or M2 states affects disease outcomes, with M1 promoting inflammation in infections and M2 aiding tissue repair, as shown in studies on macrophage subsets.
Reading Guide
Where to Start
"Macrophage plasticity and polarization: in vivo veritas" by Sica and Mantovani (2012) provides an accessible entry on macrophage subsets central to phagocytosis and immune regulation, building foundational understanding before apoptotic mechanisms.
Key Papers Explained
"The biochemistry of apoptosis" by Hengartner (2000) outlines core apoptotic processes (7296 citations), which "A novel assay for apoptosis Flow cytometric detection of phosphatidylserine expression on early apoptotic cells using fluorescein labelled Annexin V" by Vermes et al. (1995) extends to phosphatidylserine detection (5327 citations) enabling phagocytosis studies. "Macrophage plasticity and polarization: in vivo veritas" by Sica and Mantovani (2012) connects this to phagocyte function (6191 citations), while "Macrophage plasticity, polarization, and function in health and disease" (2018) reviews applications (4601 citations). "Protective and pathogenic functions of macrophage subsets" by Murray and Wynn (2011) synthesizes functional outcomes (5016 citations).
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research centers on CD47 blockade for cancer immunotherapy and TAM receptor roles in efferocytosis. No recent preprints or news available, so frontiers remain in mechanistic dissection of clearance pathways from established works.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The biochemistry of apoptosis | 2000 | Nature | 7.3K | ✕ |
| 2 | Cell Death: The Significance of Apoptosis | 1980 | International review o... | 7.2K | ✕ |
| 3 | Caspases: Enemies Within | 1998 | Science | 6.9K | ✕ |
| 4 | Apoptosis in the Pathogenesis and Treatment of Disease | 1995 | Science | 6.6K | ✕ |
| 5 | Macrophage plasticity and polarization: in vivo veritas | 2012 | Journal of Clinical In... | 6.2K | ✕ |
| 6 | The Inflammasome | 2002 | Molecular Cell | 5.9K | ✓ |
| 7 | Death Receptors: Signaling and Modulation | 1998 | Science | 5.8K | ✕ |
| 8 | A novel assay for apoptosis Flow cytometric detection of phosp... | 1995 | Journal of Immunologic... | 5.3K | ✓ |
| 9 | Protective and pathogenic functions of macrophage subsets | 2011 | Nature reviews. Immuno... | 5.0K | ✕ |
| 10 | Macrophage plasticity, polarization, and function in health an... | 2018 | Journal of Cellular Ph... | 4.6K | ✕ |
Frequently Asked Questions
What role does phosphatidylserine play in phagocytosis?
Phosphatidylserine translocates to the outer plasma membrane during early apoptosis, serving as an 'eat me' signal for phagocytes. "A novel assay for apoptosis Flow cytometric detection of phosphatidylserine expression on early apoptotic cells using fluorescein labelled Annexin V" (1995) demonstrated this exposure using Annexin V binding. This facilitates efferocytosis and immune regulation.
How do TAM receptors contribute to apoptotic cell clearance?
TAM receptors on phagocytes recognize phosphatidylserine on apoptotic cells to promote efferocytosis. This process suppresses inflammation and supports immune homeostasis. The field description highlights TAM receptors as key in apoptotic cell clearance mechanisms.
What is the significance of CD47 in phagocytosis?
CD47 acts as a 'don't eat me' signal on cells, inhibiting phagocytosis by interacting with SIRPα on macrophages. Blocking CD47 enhances tumor cell phagocytosis in cancer immunotherapy. This is central to the topic's focus on phagocytosis regulation.
What are M1 and M2 macrophage polarizations?
"Macrophage plasticity and polarization: in vivo veritas" (2012) by Sica and Mantovani describes M1 macrophages activated by IFNs or Toll-like receptors as pro-inflammatory, and M2 by IL-4/IL-13 as anti-inflammatory. These states represent extremes of a continuum affecting phagocytosis and immune regulation. "Macrophage plasticity, polarization, and function in health and disease" (2018) confirms M1 polarization by LPS.
How does efferocytosis regulate immunity?
Efferocytosis is the phagocytosis of apoptotic cells, promoting anti-inflammatory responses and preventing autoimmunity. It involves recognition via phosphatidylserine and receptors like TAM. Failures in efferocytosis link to immune-related diseases per the topic description.
What is the current state of research in this field?
The field includes 30,830 works focused on apoptotic cell clearance, CD47, TAM receptors, and efferocytosis. Applications target cancer immunotherapy. No recent preprints or news reported in the last 6-12 months.
Open Research Questions
- ? How do interactions between CD47-SIRPα and TAM receptors fine-tune the balance between apoptotic cell clearance and inflammation?
- ? What molecular pathways link efferocytosis defects to cancer progression and immunotherapy resistance?
- ? How does macrophage polarization plasticity influence phagocytosis efficiency in chronic inflammatory diseases?
- ? Which signaling cascades downstream of phosphatidylserine recognition most critically regulate immune tolerance post-phagocytosis?
- ? Can targeting multiple 'don't eat me' signals beyond CD47 enhance therapeutic phagocytosis in solid tumors?
Recent Trends
The field holds steady at 30,830 papers with no reported 5-year growth data.
Macrophage polarization reviews continue to accumulate citations, as in "Macrophage plasticity, polarization, and function in health and disease" (2018, 4601 citations).
No new preprints or news in the last 6-12 months indicate stable focus on core mechanisms like CD47 and efferocytosis.
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