GO:0120041 positive regulation of macrophage proliferation: Immune Amplification Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120041 describes any process that activates or increases the frequency, rate or extent of macrophage proliferation, a key node in innate immunity and tissue remodelling.
• Macrophage proliferation is driven by growth factors such as CSF1 and GM-CSF, and is amplified by cytokine loops including IL-6 and CCL2.
• Metabolic reprogramming, particularly glycolysis, is required for proliferating macrophages and is controlled by transcription factors such as Zeb1.
• Tumour microenvironments exploit positive regulation of macrophage proliferation to expand tumour-associated macrophages that promote cancer progression.
• Single-cell and lineage-tracing technologies have revealed distinct proliferating macrophage subsets in lung metastasis, fibrotic skin and ischaemic muscle.
• CRISPR knockout, knock-in and overexpression models are essential to test causality of candidate regulators of macrophage proliferation.
Description
Macrophages are innate immune cells that can self-renew and expand in response to local cues, a process captured by the Gene Ontology term GO:0120041, positive regulation of macrophage proliferation. This term refers to any process that activates or increases the frequency, rate or extent of macrophage proliferation. Unlike generic cell-cycle terms, GO:0120041 is specifically restricted to macrophages and encompasses the extracellular signals, intracellular signalling cascades and transcriptional programmes that drive their expansion in development, homeostasis and disease. Understanding this process is critical because macrophage numbers are tightly linked to outcomes in cancer, chronic inflammation, fibrosis and tissue repair. Recent studies have shown that macrophage proliferation is not a uniform phenomenon but is context-dependent. In ischaemic muscle, endothelial lactate induces M2-like macrophage polarisation and supports their expansion during regeneration. In breast cancer, Zeb1-driven glycolytic reprogramming is essential for macrophage polarisation and proliferation in the tumour microenvironment. In bladder cancer, downregulation of SPOP enhances cancer cell-macrophage crosstalk via the STAT3/CCL2/IL-6 axis, promoting macrophage recruitment and proliferation. These examples illustrate that positive regulation of macrophage proliferation is a convergence point for metabolic, cytokine and transcriptional inputs. For researchers, GO:0120041 provides a precise annotation target for functional genomics. It helps interpret single-cell RNA sequencing clusters, CRISPR screens and cytokine profiling experiments by linking candidate genes to a defined biological outcome. Because macrophage proliferation is amenable to genetic perturbation, it is an attractive axis for therapeutic intervention in oncology and regenerative medicine.
positive regulation of macrophage proliferation At A Glance
| GO ID | GO:0120041 |
|---|---|
| GO term | positive regulation of macrophage proliferation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Upregulation of macrophage self-renewal and expansion in immunity, inflammation and tissue remodelling |
| Definition source | QuickGO definition: Any process that activates or increases the frequency, rate or extent of macrophage proliferation. |
| Related processes | Macrophage activation, cytokine signalling, metabolic reprogramming, tumour-associated macrophage expansion |
| Cellular context | Bone marrow, peripheral tissues, tumour microenvironment, ischaemic muscle, fibrotic skin |
What Is GO:0120041?
GO:0120041, positive regulation of macrophage proliferation, is a biological process term defined as any process that activates or increases the frequency, rate or extent of macrophage proliferation. In practical terms, it covers the signalling molecules, receptors, transcription factors and metabolic pathways that boost the division of macrophages, beyond baseline homeostatic proliferation.
Why Is positive regulation of macrophage proliferation Important in Cell Biology?
Positive regulation of macrophage proliferation is important because macrophage abundance directly influences the resolution or exacerbation of disease. In cancer, expansion of tumour-associated macrophages is associated with poor prognosis and resistance to therapy, and this expansion depends on proliferative signals such as CCL2 and IL-6. In regenerative settings, macrophage proliferation supports muscle repair after ischaemia. In autoimmune and fibrotic diseases, proliferating macrophage subsets accumulate in affected tissues and correlate with disease severity. Therefore, identifying the genes and pathways that positively regulate macrophage proliferation offers opportunities for therapeutic targeting and for understanding basic immune cell dynamics.
• Macrophage proliferation is a hallmark of chronic inflammatory diseases, including systemic sclerosis-associated skin disease.
• Tumour-associated macrophage expansion driven by proliferative signals promotes lung cancer progression under chronic stress.
• In bladder cancer, SPOP downregulation enhances macrophage proliferation via STAT3/CCL2/IL-6 signalling.
• Metastasis-bearing lungs contain a lipid-associated macrophage subset that expands locally, highlighting proliferative heterogeneity.
• Endothelial lactate controls M2-like macrophage polarisation and proliferation during muscle regeneration from ischaemia.
• Zeb1-induced glycolytic reprogramming is essential for macrophage polarisation and proliferation in breast cancer.
• Granulocyte-monocyte progenitors can be expanded and CAR-engineered for cellular immunotherapy, relying on proliferative control.
• Neuroprotective astrocyte reactivity involves molecular switches that may influence macrophage/microglia proliferation.
• CRISPR screening enables systematic discovery of positive regulators of macrophage proliferation.
• Understanding this process aids development of therapies that either boost macrophage numbers for repair or limit them in cancer.
What Happens During positive regulation of macrophage proliferation?
Initiation by growth factors and cytokines
In simple terms: Macrophages start dividing when they receive external growth signals.
Positive regulation of macrophage proliferation begins with extracellular ligands such as colony-stimulating factor 1 (CSF1) and granulocyte-macrophage colony-stimulating factor (GM-CSF), which bind to their receptors on macrophages. In ischaemic muscle, endothelial lactate induces M2-like macrophage polarisation and supports their expansion, demonstrating that metabolic cues from the microenvironment can initiate proliferative programmes. In bladder cancer, cancer cell-macrophage crosstalk via the STAT3/CCL2/IL-6 axis promotes macrophage recruitment and proliferation. These signals converge on receptor tyrosine kinases and cytokine receptors to trigger downstream cascades.
Intracellular signalling cascades
In simple terms: Inside the cell, a relay of signals tells the macrophage to enter the cell cycle.
Following receptor activation, intracellular signalling pathways including STAT3, PI3K-AKT and MAPK are engaged. SPOP downregulation in bladder cancer enhances STAT3/CCL2/IL-6 signalling, which in turn promotes macrophage proliferation. Chronic stress stimulates protumor macrophage polarisation and expansion in lung cancer, likely through stress-related signalling that converges on proliferative pathways. These cascades activate transcription factors that drive cell-cycle entry.
Metabolic reprogramming
In simple terms: Proliferating macrophages switch their metabolism to support rapid growth.
Metabolic reprogramming towards glycolysis is essential for macrophage polarisation and proliferation. Zeb1-induced glycolytic reprogramming is required for macrophage polarisation in breast cancer, linking metabolic state to proliferative capacity. Endothelial lactate also promotes M2-like polarisation, suggesting that lactate metabolism supports proliferative expansion in regenerating muscle. This metabolic switch provides biosynthetic precursors and energy for cell division.
Transcriptional control of proliferation
In simple terms: Master transcription factors turn on the genes needed for division.
Transcription factors such as Zeb1 and STAT3 orchestrate the gene expression programmes that drive macrophage proliferation. Zeb1-induced metabolic reprogramming is essential for macrophage polarisation in breast cancer, and its activity supports proliferative gene expression. STAT3 activation downstream of cytokine signalling promotes macrophage recruitment and proliferation in bladder cancer. These transcription factors coordinate cell-cycle genes, metabolic enzymes and survival factors.
Expansion of specialised macrophage subsets
In simple terms: Different macrophage subsets expand in different tissues.
Positive regulation of macrophage proliferation leads to expansion of distinct subsets depending on tissue context. In metastasis-bearing lungs, a lipid-associated macrophage subset expands locally. In systemic sclerosis, Fcγ receptor IIIa-positive macrophages expand and are associated with severe skin disease. Granulocyte-monocyte progenitors can be expanded and CAR-engineered for immunotherapy, demonstrating controlled proliferative expansion ex vivo. These examples highlight the heterogeneity of proliferative responses.
Key Genes Involved in GO:0120041 positive regulation of macrophage proliferation
The following genes and proteins have been experimentally linked to positive regulation of macrophage proliferation or closely related macrophage expansion processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CSF1 | Primary growth factor for macrophage proliferation and survival | Target for modulating macrophage numbers in cancer and repair |
| GM-CSF (CSF2) | Stimulates macrophage and granulocyte proliferation | Used in immunotherapy and inflammatory models |
| STAT3 | Transcription factor downstream of cytokine signalling | Mediates CCL2/IL-6-driven macrophage proliferation in bladder cancer |
| CCL2 | Chemokine that recruits and promotes macrophage expansion | Key mediator of cancer cell-macrophage crosstalk |
| IL6 | Cytokine that amplifies macrophage proliferation | Part of STAT3/CCL2/IL-6 axis in bladder cancer |
| ZEB1 | Transcription factor driving glycolytic reprogramming | Essential for macrophage polarisation and proliferation in breast cancer |
| SPOP | E3 ubiquitin ligase that regulates STAT3 signalling | Downregulation promotes macrophage proliferation in bladder cancer |
| VEGFA | Angiogenic factor that influences macrophage recruitment | Linked to tumour-associated macrophage expansion |
| CSF1R | Receptor for CSF1 | Target for inhibiting macrophage proliferation in tumours |
| FCGR3A | Fcγ receptor IIIa, marker of expanded macrophage subset | Associated with severe skin disease in systemic sclerosis |
| FCN1 | Ficolin 1, marker of monocyte-derived cells | Identifies expanded myeloid subsets in systemic sclerosis |
| HIF1A | Hypoxia-inducible factor, metabolic regulator | May support glycolytic reprogramming in proliferating macrophages |
| MYC | Proliferation-associated transcription factor | Downstream of growth factor signalling in macrophages |
| MTOR | Central regulator of cell growth and proliferation | Integrates metabolic and cytokine signals in macrophages |
| CCND1 | Cell cycle regulator (cyclin D1) | Drives G1/S transition in proliferating macrophages |
| CDK4 | Cell cycle kinase | Potential target for limiting macrophage expansion |
| CDK6 | Cell cycle kinase | Potential target for limiting macrophage expansion |
| MKI67 | Proliferation marker | Used to quantify macrophage proliferation in tissues |
How Is positive regulation of macrophage proliferation Regulated?
Positive regulation of macrophage proliferation is controlled by a multilayered network. Growth factors such as CSF1 and GM-CSF provide primary mitogenic signals. Cytokine loops involving IL-6 and CCL2 amplify proliferation through STAT3 activation, as shown in bladder cancer. Metabolic regulation via glycolysis, controlled by Zeb1, is required for proliferative capacity in breast cancer macrophages. Endothelial lactate promotes M2-like polarisation and expansion in ischaemic muscle. Chronic stress can stimulate protumor macrophage polarisation and expansion in lung cancer. These regulatory inputs converge on cell-cycle machinery and transcriptional programmes, and can be modelled using CRISPR screens and single-cell technologies.
positive regulation of macrophage proliferation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SPOP | Bladder cancer progression via STAT3/CCL2/IL-6 axis | SPOP knockout bladder cancer cell lines co-cultured with macrophages |
| ZEB1 | Breast cancer macrophage polarisation and proliferation | ZEB1 knockout or overexpression in breast cancer cells |
| CCL2 | Tumour-associated macrophage expansion | CCL2 knockout mouse models or CRISPR knockout in cancer cells |
| IL6 | Inflammatory macrophage proliferation | IL6 knockout or neutralising antibody models |
| FCGR3A | Systemic sclerosis-associated skin disease | FCGR3A reporter or knockout macrophages in fibrosis models |
Cancer progression and tumour-associated macrophages
Positive regulation of macrophage proliferation contributes to tumour progression by expanding tumour-associated macrophages. In bladder cancer, SPOP downregulation enhances STAT3/CCL2/IL-6 signalling, promoting macrophage proliferation and cancer progression. In breast cancer, Zeb1-induced glycolytic reprogramming is essential for macrophage polarisation and proliferation. Chronic stress stimulates protumor macrophage polarisation and lung cancer progression. In metastasis-bearing lungs, a lipid-associated macrophage subset expands and may support metastatic growth. Targeting proliferative signals in macrophages is therefore a potential therapeutic strategy.
Fibrotic and autoimmune skin disease
In systemic sclerosis, expansion of Fcγ receptor IIIa-positive macrophages, Ficolin 1-positive monocyte-derived dendritic cells and plasmacytoid dendritic cells is associated with severe skin disease. This suggests that positive regulation of macrophage proliferation contributes to fibrotic and autoimmune pathology, and that these expanded subsets could be therapeutic targets.
Tissue regeneration and ischaemia
In ischaemic muscle, endothelial lactate controls M2-like macrophage polarisation and supports muscle regeneration. This indicates that positive regulation of macrophage proliferation is beneficial in regenerative contexts, where macrophage expansion is required for repair.
Neuroprotection and astrocyte reactivity
A molecular switch for neuroprotective astrocyte reactivity has been described, which may influence macrophage/microglia proliferation in the central nervous system. Although the direct link to GO:0120041 requires further study, this highlights the broader relevance of proliferative regulation in neuroinflammatory contexts.
From positive regulation of macrophage proliferation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for macrophage proliferation? | CRISPR knockout in primary macrophages or macrophage cell lines |
| Does a specific point mutation in a signalling gene alter proliferation? | CRISPR point mutation knock-in in macrophage progenitors |
| Does overexpression of a gene drive macrophage expansion? | Lentiviral or CRISPR knock-in overexpression in macrophages |
| Can we track proliferating macrophages in vivo? | Tagged knock-in of proliferation markers (e.g., Ki67) in mice |
| Which genes regulate macrophage proliferation in a tumour context? | Genome-wide CRISPR library screening in co-culture systems |
| How does metabolic reprogramming affect proliferation? | Metabolic flux assays combined with CRISPR knockout of glycolytic genes |
How to Study the positive regulation of macrophage proliferation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Single-cell RNA sequencing | Transcriptional heterogeneity of macrophage subsets | Identifying proliferating macrophage clusters in tumours |
| CRISPR knockout screening | Genes required for macrophage proliferation | Discovery of positive regulators in co-culture |
| Flow cytometry with Ki67 | Frequency of proliferating macrophages | Quantifying expansion in tissues |
| Metabolic flux analysis | Glycolytic and oxidative phosphorylation rates | Assessing metabolic reprogramming |
| Cytokine profiling (ELISA/Luminex) | Levels of IL-6, CCL2 and other cytokines | Measuring proliferative signals in cancer models |
| Lineage tracing in mice | Origin and expansion of macrophage subsets | Tracking proliferation in vivo |
| Western blot and qPCR | Expression of cell-cycle and signalling proteins | Validating CRISPR perturbations |
| Co-culture assays | Macrophage proliferation induced by cancer cells | Modelling tumour microenvironment crosstalk |
Single-cell RNA sequencing and lineage tracing
Single-cell RNA sequencing has been used to characterise macrophage diversity in metastasis-bearing lungs, revealing a lipid-associated macrophage subset that expands locally. In systemic sclerosis, single-cell approaches identified expanded Fcγ receptor IIIa-positive macrophages and other myeloid subsets associated with severe skin disease. These methods allow researchers to link proliferative gene signatures to specific macrophage states.
CRISPR screening and functional genomics
CRISPR library screening enables systematic discovery of genes that positively regulate macrophage proliferation. For example, expansion and CAR engineering of granulocyte-monocyte progenitors for cellular immunotherapy relies on understanding proliferative control. In bladder cancer, functional studies identified SPOP downregulation as a driver of macrophage proliferation via STAT3/CCL2/IL-6. These approaches can be adapted to macrophage-specific screens.
Metabolic and cytokine profiling
Metabolic reprogramming, such as Zeb1-induced glycolysis, is essential for macrophage polarisation and proliferation in breast cancer. Endothelial lactate controls M2-like macrophage polarisation in ischaemic muscle. Cytokine profiling of IL-6 and CCL2 in tumour models helps quantify proliferative signals. These methods provide functional readouts of positive regulation.
In vivo models of inflammation and cancer
Chronic stress models have been used to study protumor macrophage polarisation and lung cancer progression. Ischaemia-reperfusion models in muscle reveal endothelial lactate-driven macrophage expansion. Systemic sclerosis skin biopsies provide clinical material for studying macrophage proliferation. These in vivo systems are critical for validating findings from cell culture.
How CRISPR Can Be Used to Study GO:0120041 positive regulation of macrophage proliferation
Knockout
CRISPR knockout is used to delete candidate genes such as SPOP, ZEB1 or STAT3 in macrophages or cancer cells to test whether they are required for positive regulation of macrophage proliferation. For example, SPOP downregulation promotes bladder cancer progression via STAT3/CCL2/IL-6, and knockout models can confirm this axis. Knockout of glycolytic genes can test the requirement for metabolic reprogramming in proliferation.
Point Mutation
CRISPR point mutation knock-in allows precise introduction of disease-associated mutations in genes such as STAT3 or SPOP to study their effect on macrophage proliferation. This approach can dissect signalling domains required for cytokine-driven expansion. Point mutations in metabolic enzymes can also reveal residues critical for glycolytic reprogramming.
Knock-in
CRISPR knock-in can be used to tag endogenous proteins with fluorescent reporters or epitope tags to track proliferating macrophages. For example, knocking in a reporter into the MKI67 locus enables live tracking of proliferation. Knock-in of CAR constructs into granulocyte-monocyte progenitors is used for cellular immunotherapy.
Overexpression
CRISPR-mediated overexpression or lentiviral overexpression of genes such as ZEB1, CCL2 or IL6 can drive macrophage proliferation and test sufficiency. Overexpression of Zeb1-induced glycolytic programme enhances macrophage polarisation in breast cancer models. Overexpression of CCL2 or IL6 can amplify macrophage expansion in co-culture systems.
How EDITGENE Supports positive regulation of macrophage proliferation Research
Researchers studying positive regulation of macrophage proliferation-related genes often need to determine whether a candidate gene is causally involved in macrophage expansion, and which signalling or metabolic pathways mediate its effects. EDITGENE provides a comprehensive suite of CRISPR-based services to enable these investigations.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of macrophage proliferation research.
Frequently Asked Questions About positive regulation of macrophage proliferation
What is GO:0120041?
GO:0120041 is the Gene Ontology term for positive regulation of macrophage proliferation, defined as any process that activates or increases the frequency, rate or extent of macrophage proliferation.
What genes are involved in positive regulation of macrophage proliferation?
Key genes include CSF1, GM-CSF, STAT3, CCL2, IL6, ZEB1, SPOP and FCGR3A, as identified in cancer and inflammatory disease studies.
How is macrophage proliferation regulated in cancer?
In cancer, macrophage proliferation is driven by cytokine loops such as STAT3/CCL2/IL-6 and metabolic reprogramming via Zeb1-induced glycolysis.
What diseases are associated with macrophage proliferation?
Diseases include bladder cancer, breast cancer, lung cancer, systemic sclerosis and ischaemic muscle injury.
What methods are used to study positive regulation of macrophage proliferation?
Methods include single-cell RNA sequencing, CRISPR screens, flow cytometry with Ki67, metabolic flux analysis and cytokine profiling.
Can CRISPR be used to study macrophage proliferation?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models are widely used to test causality of candidate genes in macrophage proliferation.
What is the role of Zeb1 in macrophage proliferation?
Zeb1-induced glycolytic reprogramming is essential for macrophage polarisation and proliferation in breast cancer.
How does SPOP affect macrophage proliferation?
SPOP downregulation promotes bladder cancer progression by enhancing STAT3/CCL2/IL-6 signalling, which drives macrophage proliferation.
What is the link between lactate and macrophage proliferation?
Endothelial lactate controls muscle regeneration by inducing M2-like macrophage polarisation and supporting their expansion.
How can I model positive regulation of macrophage proliferation in the lab?
You can use CRISPR knockout or overexpression in macrophage cell lines, co-culture with cancer cells, and in vivo models of cancer or ischaemia.
Conclusion
GO:0120041, positive regulation of macrophage proliferation, is a biologically and clinically significant process that integrates growth factor signalling, cytokine networks and metabolic reprogramming. It plays a central role in cancer progression, tissue regeneration and fibrotic disease, as demonstrated by studies on SPOP, Zeb1, CCL2/IL-6 and lactate. Understanding its regulation offers opportunities for therapeutic intervention and for interpreting single-cell and CRISPR screening data. Researchers can leverage CRISPR knockout, knock-in, point mutation and overexpression models to dissect the causal genes and pathways that drive macrophage expansion. EDITGENE provides end-to-end services to support these investigations, from library screening to bioinformatics analysis.
References
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- 6. Huggins DN et al.. 2021. Characterizing Macrophage Diversity in Metastasis-Bearing Lungs Reveals a Lipid-Associated Macrophage Subset.. Cancer Res 81(20):5284-5295 PMID: 34389631
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- 8. Liu C et al.. 2025. Chronic Stress Stimulates Protumor Macrophage Polarization to Propel Lung Cancer Progression.. Cancer Res 85(13):2429-2447 PMID: 40202818
