Phagocytosis

Where it participates (unsigned role)

1. Despite its ability to bind both soluble and particulate beta-glucan polymers, Dectin-1 signalling is only activated by particulate beta-glucans, which cluster the receptor in synapse-like structures from which the regulatory tyrosine phosphatases CD45 and CD148 are excluded, providing a model mechanism by which innate immune receptors can distinguish direct microbial contact from detection of microbes at a distance and initiate direct cellular antimicrobial responses only when they are required.

   The phagocytic synapse, a receptor-rich contact that excludes CD45 and CD148 → Dectin-1 / CLEC7A source_derived_draftungraded
   Experimental context and source evidence

   evidence_span

   {"source_cache": "artifacts/glucan-research/21525931.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5bb7dfc847efb60e644eeaf672d3277d18bca9c4fc75051c8d568d8e5dc450e0", "start_char": 0, "end_char": 1406, "text_sha256": "5bb7dfc847efb60e644eeaf672d3277d18bca9c4fc75051c8d568d8e5dc450e0"}

   experimental_model

   Comparison of soluble and particulate beta-glucan polymers on Dectin-1 signalling, with imaging of receptor and phosphatase distribution

   exposure

   Soluble against particulate beta-glucan polymers on Dectin-1-expressing phagocytes

   limitations

   The abstract reports the soluble-versus-particulate comparison and the phosphatase exclusion. It does not state what happens when a soluble glucan is immobilised, so no claim here rests on that.

   nutrient_topic

   Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. · Beta-glucan

   organism

   Mouse

   plain_language

   Binding was not enough: the receptor only fired when particles packed it into a patch that shut out the enzymes which switch it off.

   primary_references

   [bg-p21525931] Activation of the innate immune receptor Dectin-1 upon formation of a 'phagocytic synapse'. (2011). https://pubmed.ncbi.nlm.nih.gov/21525931/ DOI: 10.1038/nature10071

   tissue_or_cell_type

   Myeloid phagocytes

   Beta-glucan: a structural family rather than an agent, what decides whether a bound glucan actually signals, the complement route that a cereal and a yeast preparation share, and the unequal human evidence behind each (2026-09-22) · lines 138–149

   AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Comparison of soluble and particulate beta-glucan polymers on Dectin-1 signalling, with imaging of receptor and phosphatase distribution · source_derived_draft · unverified_draft

   ### bg-only-particles-signal Despite its ability to bind both soluble and particulate beta-glucan polymers, Dectin-1 signalling is only activated by particulate beta-glucans, which cluster the receptor in synapse-like structures from which the regulatory tyrosine phosphatases CD45 and CD148 are excluded, providing a model mechanism by which innate immune receptors can distinguish direct microbial contact from detection of microbes at a distance and initiate direct cellular antimicrobial responses only when they are required. Condition category: normal nutrient_topic: Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. plain_language: Binding was not enough: the receptor only fired when particles packed it into a patch that shut out the enzymes which switch it off. organism: Mouse tissue_or_cell_type: Myeloid phagocytes experimental_model: Comparison of soluble and particulate beta-glucan polymers on Dectin-1 signalling, with imaging of receptor and phosphatase distribution limitations: The abstract reports the soluble-versus-particulate comparison and the phosphatase exclusion. It does not state what happens when a soluble glucan is immobilised, so no claim here rests on that. exposure: Soluble against particulate beta-glucan polymers on Dectin-1-expressing phagocytes evidence_span: {"source_cache": "artifacts/glucan-research/21525931.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5bb7dfc847efb60e644eeaf672d3277d18bca9c4fc75051c8d568d8e5dc450e0", "start_char": 0, "end_char": 1406, "text_sha256": "5bb7dfc847efb60e644eeaf672d3277d18bca9c4fc75051c8d568d8e5dc450e0"} [bg-p21525931] Activation of the innate immune receptor Dectin-1 upon formation of a 'phagocytic synapse'. (2011). https://pubmed.ncbi.nlm.nih.gov/21525931/ DOI: 10.1038/nature10071

   Complete structured claim and evidence

2. Beta-glucans differ greatly in size, structure and ability to activate effector immune responses from dendritic cells and small particulate beta-glucans are thought to be poor activators of innate immunity, and large beta-glucan-stimulated human dendritic cells generate significantly more IL-1beta, IL-6 and IL-23 compared to those stimulated with the smaller beta-glucans, while in marked contrast the secretion of TSLP and CCL22 were found to be insensitive to beta-glucan particle size, with the capacity to induce phagocytosis and the relative IL-1beta production determined by beta-glucan size regulating the composition of the cytokine milieu.

   Particle size of a glucan preparation → Interleukin-1 beta / IL1B source_derived_draftungraded
   Experimental context and source evidence

   evidence_span

   {"source_cache": "artifacts/glucan-research/28736555.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9e9388d9e8263db85cdd17df9a497d9867627097a09ff8a0d630e5733e591e54", "start_char": 0, "end_char": 1128, "text_sha256": "9e9388d9e8263db85cdd17df9a497d9867627097a09ff8a0d630e5733e591e54"}

   experimental_model

   Comparison of large and small beta-glucan particles on human dendritic cell cytokine output

   exposure

   Large against small particulate beta-glucans, with assessment of phagocytosis

   limitations

   Human primary cells with a size comparison. The abstract reports the cytokine differences and the role of phagocytosis and IL-1beta; it does not report an oxidase dependence, so no claim here rests on that.

   nutrient_topic

   Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. · Beta-glucan

   organism

   Human

   plain_language

   Bigger particles pulled three inflammatory signals out of the same cells; two other signals did not care about size at all.

   primary_references

   [bg-p28736555] β-Glucan Size Controls Dectin-1-Mediated Immune Responses in Human Dendritic Cells by Regulating IL-1β Production. (2017). https://pubmed.ncbi.nlm.nih.gov/28736555/ DOI: 10.3389/fimmu.2017.00791

   tissue_or_cell_type

   Monocyte-derived dendritic cell

   Beta-glucan: a structural family rather than an agent, what decides whether a bound glucan actually signals, the complement route that a cereal and a yeast preparation share, and the unequal human evidence behind each (2026-09-22) · lines 177–188

   AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Comparison of large and small beta-glucan particles on human dendritic cell cytokine output · source_derived_draft · unverified_draft

   ### bg-particle-size-sets-the-cytokines Beta-glucans differ greatly in size, structure and ability to activate effector immune responses from dendritic cells and small particulate beta-glucans are thought to be poor activators of innate immunity, and large beta-glucan-stimulated human dendritic cells generate significantly more IL-1beta, IL-6 and IL-23 compared to those stimulated with the smaller beta-glucans, while in marked contrast the secretion of TSLP and CCL22 were found to be insensitive to beta-glucan particle size, with the capacity to induce phagocytosis and the relative IL-1beta production determined by beta-glucan size regulating the composition of the cytokine milieu. Condition category: normal nutrient_topic: Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. plain_language: Bigger particles pulled three inflammatory signals out of the same cells; two other signals did not care about size at all. organism: Human tissue_or_cell_type: Monocyte-derived dendritic cell experimental_model: Comparison of large and small beta-glucan particles on human dendritic cell cytokine output limitations: Human primary cells with a size comparison. The abstract reports the cytokine differences and the role of phagocytosis and IL-1beta; it does not report an oxidase dependence, so no claim here rests on that. exposure: Large against small particulate beta-glucans, with assessment of phagocytosis evidence_span: {"source_cache": "artifacts/glucan-research/28736555.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9e9388d9e8263db85cdd17df9a497d9867627097a09ff8a0d630e5733e591e54", "start_char": 0, "end_char": 1128, "text_sha256": "9e9388d9e8263db85cdd17df9a497d9867627097a09ff8a0d630e5733e591e54"} [bg-p28736555] β-Glucan Size Controls Dectin-1-Mediated Immune Responses in Human Dendritic Cells by Regulating IL-1β Production. (2017). https://pubmed.ncbi.nlm.nih.gov/28736555/ DOI: 10.3389/fimmu.2017.00791

   Complete structured claim and evidence

3. Dectin-1 activates Syk in macrophages and is important for Dectin-1-stimulated reactive oxygen production but not for phagocytosis, Syk activation is restricted to a subpopulation of macrophages that is in equilibrium with cells that cannot activate the pathway, and the proportion of macrophages using this signalling pathway can be modulated by cytokine treatment, so Dectin-1 signalling reveals dynamic macrophage heterogeneity in inflammatory activation potential.

   Dectin-1 / CLEC7A → Spleen tyrosine kinase / SYK source_derived_draftungraded
   Experimental context and source evidence

   evidence_span

   {"source_cache": "artifacts/glucan-research/15956283.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "05fbe0dae04d44d8af5946504f066c104e7a294b29d35d70463d50874ec7b41c", "start_char": 0, "end_char": 990, "text_sha256": "05fbe0dae04d44d8af5946504f066c104e7a294b29d35d70463d50874ec7b41c"}

   experimental_model

   Measurement of Syk activation and reactive oxygen production in macrophage subpopulations

   exposure

   Dectin-1 stimulation with assessment of Syk activation, reactive oxygen production and phagocytosis

   limitations

   The heterogeneity finding is the important limit: the pathway operated in a subpopulation in equilibrium with cells that could not use it, and the proportion shifted with cytokine treatment.

   nutrient_topic

   Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. · Beta-glucan

   organism

   Mouse

   plain_language

   One kinase carries the oxidative burst but not the swallowing, and only some of the cells can run it at any moment.

   primary_references

   [bg-p15956283] Dectin-1 activates Syk tyrosine kinase in a dynamic subset of macrophages for reactive oxygen production. (2005). https://pubmed.ncbi.nlm.nih.gov/15956283/ DOI: 10.1182/blood-2005-03-1239

   tissue_or_cell_type

   Macrophage

   Beta-glucan: a structural family rather than an agent, what decides whether a bound glucan actually signals, the complement route that a cereal and a yeast preparation share, and the unequal human evidence behind each (2026-09-22) · lines 398–409

   AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Measurement of Syk activation and reactive oxygen production in macrophage subpopulations · source_derived_draft · unverified_draft

   ### bg-syk-carries-the-oxidative-burst Dectin-1 activates Syk in macrophages and is important for Dectin-1-stimulated reactive oxygen production but not for phagocytosis, Syk activation is restricted to a subpopulation of macrophages that is in equilibrium with cells that cannot activate the pathway, and the proportion of macrophages using this signalling pathway can be modulated by cytokine treatment, so Dectin-1 signalling reveals dynamic macrophage heterogeneity in inflammatory activation potential. Condition category: normal nutrient_topic: Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. plain_language: One kinase carries the oxidative burst but not the swallowing, and only some of the cells can run it at any moment. organism: Mouse tissue_or_cell_type: Macrophage experimental_model: Measurement of Syk activation and reactive oxygen production in macrophage subpopulations limitations: The heterogeneity finding is the important limit: the pathway operated in a subpopulation in equilibrium with cells that could not use it, and the proportion shifted with cytokine treatment. exposure: Dectin-1 stimulation with assessment of Syk activation, reactive oxygen production and phagocytosis evidence_span: {"source_cache": "artifacts/glucan-research/15956283.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "05fbe0dae04d44d8af5946504f066c104e7a294b29d35d70463d50874ec7b41c", "start_char": 0, "end_char": 990, "text_sha256": "05fbe0dae04d44d8af5946504f066c104e7a294b29d35d70463d50874ec7b41c"} [bg-p15956283] Dectin-1 activates Syk tyrosine kinase in a dynamic subset of macrophages for reactive oxygen production. (2005). https://pubmed.ncbi.nlm.nih.gov/15956283/ DOI: 10.1182/blood-2005-03-1239

   Complete structured claim and evidence