Component

Propionate

Propionate. Species, exposure and limitations are retained in each linked claim.

9 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. In the preprint, propionate rescued propionyl-CoA and selected histone propionylation after combined isoleucine/valine deprivation, but did not restore proliferation.

    Propionate → Histone propionylation in PDA cell models source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    evidence_access
    Primary preprint full text; not peer reviewed
    experimental_model
    Mouse KPC and human PDA cell assays; combined Ile/Val removal, twenty-four hours.
    limitations
    Preprint; deprivation of two amino acids cannot be attributed exclusively to one.
    nutrient_topic
    L-Isoleucine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Isoleucine
    plain_language
    Restoring one carbon product did not replace essential amino-acid supply.
    primary_references
    A nuclear branched-chain amino acid catabolism pathway controls histone propionylation in pancreatic cancer. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40568091/ · DOI 10.1101/2025.04.23.650241
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    L-Isoleucine: transport, translation, catabolism and cross-nutrient mechanisms (2026-09-19) · lines 482–488

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse KPC and human PDA cell assays; combined Ile/Val removal, twenty-four hours. · source_derived_draft · unverified_draft

    ## isoleucine-pancreatic-preprint-rescue Restoring one carbon product did not replace essential amino-acid supply. In the preprint, propionate rescued propionyl-CoA and selected histone propionylation after combined isoleucine/valine deprivation, but did not restore proliferation. Model: Mouse KPC and human PDA cell assays; combined Ile/Val removal, twenty-four hours. Limitations: Preprint; deprivation of two amino acids cannot be attributed exclusively to one. Evidence access: Primary preprint full text; not peer reviewed A nuclear branched-chain amino acid catabolism pathway controls histone propionylation in pancreatic cancer. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40568091/ · DOI 10.1101/2025.04.23.650241
    Complete structured claim and evidence

What acts on it

  1. E. coli TdcD or AckA converted propionyl phosphate to propionate with ATP generation in the anaerobic threonine-degradation pathway.

    Escherichia coli propionate kinase / TdcD → Propionate source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Mutant pathway analysis and enzyme characterization.
    limitations
    Whether this pathway changes human host exposure depends on community, substrate supply and environmental conditions.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    A microbial fermentation step releases energy as well as a short-chain fatty acid.
    primary_references
    Novel keto acid formate-lyase and propionate kinase enzymes are components of an anaerobic pathway in Escherichia coli that degrades L-threonine to propionate. · 1998 · https://pubmed.ncbi.nlm.nih.gov/9484901/ · DOI 10.1046/j.1365-2958.1998.00696.x

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 434–440

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mutant pathway analysis and enzyme characterization. · source_derived_draft · unverified_draft

    ## l-threonine-microbial-atp A microbial fermentation step releases energy as well as a short-chain fatty acid. E. coli TdcD or AckA converted propionyl phosphate to propionate with ATP generation in the anaerobic threonine-degradation pathway. Model: Mutant pathway analysis and enzyme characterization. Limitations: Whether this pathway changes human host exposure depends on community, substrate supply and environmental conditions. Evidence access: Primary abstract Novel keto acid formate-lyase and propionate kinase enzymes are components of an anaerobic pathway in Escherichia coli that degrades L-threonine to propionate. · 1998 · https://pubmed.ncbi.nlm.nih.gov/9484901/ · DOI 10.1046/j.1365-2958.1998.00696.x
    Complete structured claim and evidence
  2. The carrot RG-I model intervention increased propionate by a reported 17.6 mM.

    Carrot pectin extract enriched in RG-I → Propionate source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/pectin-research/34683463.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "38a179d5d001092c0d9595bb3d93ae4fcf8780bb7ae6286e0edfd27971c2aabc", "start_char": 0, "end_char": 1830, "text_sha256": "38a179d5d001092c0d9595bb3d93ae4fcf8780bb7ae6286e0edfd27971c2aabc"}
    experimental_model
    M-SHIME simulated colons with four donor microbiotas
    exposure
    Carrot RG-I extract, 3 g/day for three weeks in the model
    limitations
    No human host received this regimen in this experiment. Donor-specific cultures and product composition limit extrapolation.
    nutrient_topic
    Pectin research collection; topical membership is not evidence of a direct dietary effect. · Pectin, structurally heterogeneous plant polysaccharides
    organism
    Human fecal microbial communities in vitro
    plain_language
    This particular extract supported microbial production of propionate in simulated colons.
    primary_references
    [pectin-p34683463] Consistent Prebiotic Effects of Carrot RG-I on the Gut Microbiota of Four Human Adult Donors in the SHIME® Model despite Baseline Individual Variability. (2021). https://pubmed.ncbi.nlm.nih.gov/34683463/ DOI: 10.3390/microorganisms9102142
    tissue_or_cell_type
    Simulated colonic compartments

    Pectin: metabolism, signaling and nutrient connections (2026-09-17) · lines 919–930

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · M-SHIME simulated colons with four donor microbiotas · source_derived_draft · unverified_draft

    ### pectin-crgi-propionate The carrot RG-I model intervention increased propionate by a reported 17.6 mM. Condition category: normal nutrient_topic: Pectin research collection; topical membership is not evidence of a direct dietary effect. plain_language: This particular extract supported microbial production of propionate in simulated colons. organism: Human fecal microbial communities in vitro tissue_or_cell_type: Simulated colonic compartments experimental_model: M-SHIME simulated colons with four donor microbiotas limitations: No human host received this regimen in this experiment. Donor-specific cultures and product composition limit extrapolation. exposure: Carrot RG-I extract, 3 g/day for three weeks in the model evidence_span: {"source_cache": "artifacts/pectin-research/34683463.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "38a179d5d001092c0d9595bb3d93ae4fcf8780bb7ae6286e0edfd27971c2aabc", "start_char": 0, "end_char": 1830, "text_sha256": "38a179d5d001092c0d9595bb3d93ae4fcf8780bb7ae6286e0edfd27971c2aabc"} [pectin-p34683463] Consistent Prebiotic Effects of Carrot RG-I on the Gut Microbiota of Four Human Adult Donors in the SHIME® Model despite Baseline Individual Variability. (2021). https://pubmed.ncbi.nlm.nih.gov/34683463/ DOI: 10.3390/microorganisms9102142
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. A three-day intervention with granola containing cereal beta-glucan improved the glycemic response and changed the gut microbiota, with circulating acetate and butyrate increasing while propionate did not, in a study in which participants consumed granolas of differing beta-glucan content in fixed sequence and in which the granolas also differed in other constituents.

    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/glucan-research/35578615.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "df79afd1ef3d79ffee2a9da5f5f7e487f296cca7e9ccfcda177266b08efed747", "start_char": 0, "end_char": 2197, "text_sha256": "df79afd1ef3d79ffee2a9da5f5f7e487f296cca7e9ccfcda177266b08efed747"}
    experimental_model
    Fixed-sequence crossover intervention with three granolas over three days each
    exposure
    Granola containing low, medium or high cereal beta-glucan, given in that order
    limitations
    Fourteen completers, a fixed sequence rather than randomised order, and granolas that differed in other constituents including inulin. Short-chain fatty acids were measured in blood while faecal samples were used for the microbiota.
    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
    Three days of a cereal glucan raised two of the three main fermentation acids in the blood.
    primary_references
    [bg-p35578615] A Three-Day Intervention With Granola Containing Cereal Beta-Glucan Improves Glycemic Response and Changes the Gut Microbiota in Healthy Individuals: A Crossover Study. (2022). https://pubmed.ncbi.nlm.nih.gov/35578615/ DOI: 10.3389/fnut.2022.796362
    tissue_or_cell_type
    Blood and faecal microbiota

    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 645–656

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Fixed-sequence crossover intervention with three granolas over three days each · source_derived_draft · unverified_draft

    ### bg-circulating-scfa-rise-with-granola A three-day intervention with granola containing cereal beta-glucan improved the glycemic response and changed the gut microbiota, with circulating acetate and butyrate increasing while propionate did not, in a study in which participants consumed granolas of differing beta-glucan content in fixed sequence and in which the granolas also differed in other constituents. 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: Three days of a cereal glucan raised two of the three main fermentation acids in the blood. organism: Human tissue_or_cell_type: Blood and faecal microbiota experimental_model: Fixed-sequence crossover intervention with three granolas over three days each limitations: Fourteen completers, a fixed sequence rather than randomised order, and granolas that differed in other constituents including inulin. Short-chain fatty acids were measured in blood while faecal samples were used for the microbiota. exposure: Granola containing low, medium or high cereal beta-glucan, given in that order evidence_span: {"source_cache": "artifacts/glucan-research/35578615.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "df79afd1ef3d79ffee2a9da5f5f7e487f296cca7e9ccfcda177266b08efed747", "start_char": 0, "end_char": 2197, "text_sha256": "df79afd1ef3d79ffee2a9da5f5f7e487f296cca7e9ccfcda177266b08efed747"} [bg-p35578615] A Three-Day Intervention With Granola Containing Cereal Beta-Glucan Improves Glycemic Response and Changes the Gut Microbiota in Healthy Individuals: A Crossover Study. (2022). https://pubmed.ncbi.nlm.nih.gov/35578615/ DOI: 10.3389/fnut.2022.796362
    Complete structured claim and evidence
  2. The acetate anion was identified as an agonist of human GPR43 during ligand bank screening in yeast and confirmed after transient transfection using calcium mobilisation and GTP-gamma-S binding assays and by coexpression with GIRK potassium channels in Xenopus oocytes, with formate, propionate, butyrate and pentanoate also showing agonist activity.

    Acetate → Human free fatty acid receptor 2 / FFAR2 source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/acetate-research/12496283.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83f7777cab02a7c69f063d21e26f895884724f46ad539ebc767d9e6f371bf64f", "start_char": 0, "end_char": 1291, "text_sha256": "83f7777cab02a7c69f063d21e26f895884724f46ad539ebc767d9e6f371bf64f"}
    experimental_model
    Ligand bank screening in yeast, confirmed by calcium mobilisation, GTP-gamma-S binding and oocyte coexpression
    exposure
    Short chain carboxylic acid anions applied to recombinant GPR41 and GPR43
    limitations
    The deorphanising paper. Potencies come from recombinant systems, not from tissue, and the authors state plainly that the cognate physiological ligands are not clear.
    nutrient_topic
    Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. · Acetic acid
    organism
    Human and mouse receptors
    plain_language
    Acetate is not only fuel; it is the signal that identified this receptor.
    primary_references
    [acetate-p12496283] The Orphan G protein-coupled receptors GPR41 and GPR43 are activated by propionate and other short chain carboxylic acids. (2003). https://pubmed.ncbi.nlm.nih.gov/12496283/ DOI: 10.1074/jbc.m211609200
    tissue_or_cell_type
    Transfected mammalian cells and Xenopus oocytes

    Acetic acid: the ingested acid, the receptors acetate binds, the acetyl-CoA it becomes, and the acetyl groups that reach histones (2026-09-21) · lines 225–236

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Ligand bank screening in yeast, confirmed by calcium mobilisation, GTP-gamma-S binding and oocyte coexpression · source_derived_draft · unverified_draft

    ### acetate-acetate-activates-ffar2 The acetate anion was identified as an agonist of human GPR43 during ligand bank screening in yeast and confirmed after transient transfection using calcium mobilisation and GTP-gamma-S binding assays and by coexpression with GIRK potassium channels in Xenopus oocytes, with formate, propionate, butyrate and pentanoate also showing agonist activity. Condition category: normal nutrient_topic: Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. plain_language: Acetate is not only fuel; it is the signal that identified this receptor. organism: Human and mouse receptors tissue_or_cell_type: Transfected mammalian cells and Xenopus oocytes experimental_model: Ligand bank screening in yeast, confirmed by calcium mobilisation, GTP-gamma-S binding and oocyte coexpression limitations: The deorphanising paper. Potencies come from recombinant systems, not from tissue, and the authors state plainly that the cognate physiological ligands are not clear. exposure: Short chain carboxylic acid anions applied to recombinant GPR41 and GPR43 evidence_span: {"source_cache": "artifacts/acetate-research/12496283.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83f7777cab02a7c69f063d21e26f895884724f46ad539ebc767d9e6f371bf64f", "start_char": 0, "end_char": 1291, "text_sha256": "83f7777cab02a7c69f063d21e26f895884724f46ad539ebc767d9e6f371bf64f"} [acetate-p12496283] The Orphan G protein-coupled receptors GPR41 and GPR43 are activated by propionate and other short chain carboxylic acids. (2003). https://pubmed.ncbi.nlm.nih.gov/12496283/ DOI: 10.1074/jbc.m211609200
    Complete structured claim and evidence
  3. Luminal and especially vascular infusion of acetate and butyrate significantly increased colonic GLP-1 secretion and to a minor extent PYY secretion in the isolated perfused rat colon, but only after enhancement of intracellular cAMP, while propionate affected neither GLP-1 nor PYY by either route.

    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/acetate-research/29494208.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126", "start_char": 0, "end_char": 2445, "text_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126"}
    experimental_model
    Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology
    exposure
    Acetate, propionate and butyrate perfused luminally or vascularly, with FFAR2/FFAR3 agonists, an FFAR3 antagonist, nifedipine, diazoxide and 2,4-dinitrophenol
    limitations
    An isolated organ preparation with an intact blood supply. It reaches the opposite mechanistic conclusion from the knockout work in this collection and is why the receptor route is recorded as disputed.
    nutrient_topic
    Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. · Acetic acid
    organism
    Rat
    plain_language
    Acetate and butyrate released the hormone from the isolated gut; propionate did not.
    primary_references
    [acetate-p29494208] The impact of short-chain fatty acids on GLP-1 and PYY secretion from the isolated perfused rat colon. (2018). https://pubmed.ncbi.nlm.nih.gov/29494208/ DOI: 10.1152/ajpgi.00346.2017
    tissue_or_cell_type
    Colon

    Acetic acid: the ingested acid, the receptors acetate binds, the acetyl-CoA it becomes, and the acetyl groups that reach histones (2026-09-21) · lines 329–340

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology · source_derived_draft · unverified_draft

    ### acetate-acetate-glp1-perfused Luminal and especially vascular infusion of acetate and butyrate significantly increased colonic GLP-1 secretion and to a minor extent PYY secretion in the isolated perfused rat colon, but only after enhancement of intracellular cAMP, while propionate affected neither GLP-1 nor PYY by either route. Condition category: normal nutrient_topic: Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. plain_language: Acetate and butyrate released the hormone from the isolated gut; propionate did not. organism: Rat tissue_or_cell_type: Colon experimental_model: Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology limitations: An isolated organ preparation with an intact blood supply. It reaches the opposite mechanistic conclusion from the knockout work in this collection and is why the receptor route is recorded as disputed. exposure: Acetate, propionate and butyrate perfused luminally or vascularly, with FFAR2/FFAR3 agonists, an FFAR3 antagonist, nifedipine, diazoxide and 2,4-dinitrophenol evidence_span: {"source_cache": "artifacts/acetate-research/29494208.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126", "start_char": 0, "end_char": 2445, "text_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126"} [acetate-p29494208] The impact of short-chain fatty acids on GLP-1 and PYY secretion from the isolated perfused rat colon. (2018). https://pubmed.ncbi.nlm.nih.gov/29494208/ DOI: 10.1152/ajpgi.00346.2017
    Complete structured claim and evidence
  4. Acetate made a significantly larger carbon contribution to lipids than propionate, butyrate, glucose or glutamine in rat colonic epithelial cells, with butyrate and 3-hydroxybutyrate the other major contributors and glucose, glutamine and propionate making only minor contributions, and incorporation was significantly greater into phospholipids than into free fatty acids and triacylglycerides, suggesting the major role of this lipogenesis is membrane synthesis.

    Acetate → De novo lipogenesis source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/acetate-research/14608066.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b2c891f60d02b85a8f4e87f26751f1129b0445fe52fb35ca5e5e20a92d4ecc5a", "start_char": 0, "end_char": 1642, "text_sha256": "b2c891f60d02b85a8f4e87f26751f1129b0445fe52fb35ca5e5e20a92d4ecc5a"}
    experimental_model
    Rat colonic epithelial cells with competing labelled substrates and ATP-citrate lyase inhibition
    exposure
    Labelled acetate, propionate, butyrate, 3-hydroxybutyrate, glucose and glutamine, with hydroxycitrate as an ATP-citrate lyase inhibitor
    limitations
    An isolated cell measurement. Its ATP-citrate lyase result anticipates by seventeen years the in vivo finding in this collection that lipogenic acetyl-CoA can arrive without that enzyme.
    nutrient_topic
    Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. · Acetic acid
    organism
    Rat
    plain_language
    The cells lining the colon build their membranes mostly out of acetate, not out of glucose.
    primary_references
    [acetate-p14608066] Acetate and butyrate are the major substrates for de novo lipogenesis in rat colonic epithelial cells. (2003). https://pubmed.ncbi.nlm.nih.gov/14608066/ DOI: 10.1093/jn/133.11.3509
    tissue_or_cell_type
    Colonic epithelium

    Acetic acid: the ingested acid, the receptors acetate binds, the acetyl-CoA it becomes, and the acetyl groups that reach histones (2026-09-21) · lines 524–535

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Rat colonic epithelial cells with competing labelled substrates and ATP-citrate lyase inhibition · source_derived_draft · unverified_draft

    ### acetate-colonocyte-prefers-acetate Acetate made a significantly larger carbon contribution to lipids than propionate, butyrate, glucose or glutamine in rat colonic epithelial cells, with butyrate and 3-hydroxybutyrate the other major contributors and glucose, glutamine and propionate making only minor contributions, and incorporation was significantly greater into phospholipids than into free fatty acids and triacylglycerides, suggesting the major role of this lipogenesis is membrane synthesis. Condition category: normal nutrient_topic: Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. plain_language: The cells lining the colon build their membranes mostly out of acetate, not out of glucose. organism: Rat tissue_or_cell_type: Colonic epithelium experimental_model: Rat colonic epithelial cells with competing labelled substrates and ATP-citrate lyase inhibition limitations: An isolated cell measurement. Its ATP-citrate lyase result anticipates by seventeen years the in vivo finding in this collection that lipogenic acetyl-CoA can arrive without that enzyme. exposure: Labelled acetate, propionate, butyrate, 3-hydroxybutyrate, glucose and glutamine, with hydroxycitrate as an ATP-citrate lyase inhibitor evidence_span: {"source_cache": "artifacts/acetate-research/14608066.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b2c891f60d02b85a8f4e87f26751f1129b0445fe52fb35ca5e5e20a92d4ecc5a", "start_char": 0, "end_char": 1642, "text_sha256": "b2c891f60d02b85a8f4e87f26751f1129b0445fe52fb35ca5e5e20a92d4ecc5a"} [acetate-p14608066] Acetate and butyrate are the major substrates for de novo lipogenesis in rat colonic epithelial cells. (2003). https://pubmed.ncbi.nlm.nih.gov/14608066/ DOI: 10.1093/jn/133.11.3509
    Complete structured claim and evidence
  5. Propionate stimulated secretion of both peptide YY and GLP-1 from wild-type murine colonic crypt cultures and this effect was significantly attenuated in cultures from FFA2 knockout mice, while intra-colonic infusion of propionate elevated both hormones in portal vein plasma in rats and mice but did not significantly stimulate their release in FFA2 knockout mice.

    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/acetate-research/25109781.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "c3c934644f9308be7b2c26f969858debd0d1dbf19bee7e307e529d392fe135d6", "start_char": 0, "end_char": 1621, "text_sha256": "c3c934644f9308be7b2c26f969858debd0d1dbf19bee7e307e529d392fe135d6"}
    experimental_model
    Wistar rats, C57BL6 mice and FFA2 knockout mice, with colonic crypt cultures and portal vein sampling
    exposure
    Propionate applied to colonic crypt cultures and infused into the colon, with FFA2 deletion as the test of mediation
    limitations
    Establishes the receptor-to-hormone step in rodents using propionate rather than acetate. The knockout is the strength of the design.
    nutrient_topic
    Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. · Acetic acid
    organism
    Rat and mouse
    plain_language
    In rodents the receptor is what releases the two gut hormones; delete it and the response goes.
    primary_references
    [acetate-p25109781] The short chain fatty acid propionate stimulates GLP-1 and PYY secretion via free fatty acid receptor 2 in rodents. (2015). https://pubmed.ncbi.nlm.nih.gov/25109781/ DOI: 10.1038/ijo.2014.153
    tissue_or_cell_type
    Colon

    Acetic acid: the ingested acid, the receptors acetate binds, the acetyl-CoA it becomes, and the acetyl groups that reach histones (2026-09-21) · lines 316–327

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Wistar rats, C57BL6 mice and FFA2 knockout mice, with colonic crypt cultures and portal vein sampling · source_derived_draft · unverified_draft

    ### acetate-scfa-glp1-rodent Propionate stimulated secretion of both peptide YY and GLP-1 from wild-type murine colonic crypt cultures and this effect was significantly attenuated in cultures from FFA2 knockout mice, while intra-colonic infusion of propionate elevated both hormones in portal vein plasma in rats and mice but did not significantly stimulate their release in FFA2 knockout mice. Condition category: normal nutrient_topic: Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. plain_language: In rodents the receptor is what releases the two gut hormones; delete it and the response goes. organism: Rat and mouse tissue_or_cell_type: Colon experimental_model: Wistar rats, C57BL6 mice and FFA2 knockout mice, with colonic crypt cultures and portal vein sampling limitations: Establishes the receptor-to-hormone step in rodents using propionate rather than acetate. The knockout is the strength of the design. exposure: Propionate applied to colonic crypt cultures and infused into the colon, with FFA2 deletion as the test of mediation evidence_span: {"source_cache": "artifacts/acetate-research/25109781.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "c3c934644f9308be7b2c26f969858debd0d1dbf19bee7e307e529d392fe135d6", "start_char": 0, "end_char": 1621, "text_sha256": "c3c934644f9308be7b2c26f969858debd0d1dbf19bee7e307e529d392fe135d6"} [acetate-p25109781] The short chain fatty acid propionate stimulates GLP-1 and PYY secretion via free fatty acid receptor 2 in rodents. (2015). https://pubmed.ncbi.nlm.nih.gov/25109781/ DOI: 10.1038/ijo.2014.153
    Complete structured claim and evidence
  6. Receptor studies confirmed acetate, propionate and butyrate to be low-potency partial agonists of FFAR2 compared with the synthetic agonist CFMB, which is a full agonist with roughly 750-fold higher potency than the short-chain fatty acids.

    Acetate → Human free fatty acid receptor 2 / FFAR2 source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/acetate-research/29494208.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126", "start_char": 0, "end_char": 2445, "text_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126"}
    experimental_model
    Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology
    exposure
    Acetate, propionate and butyrate perfused luminally or vascularly, with FFAR2/FFAR3 agonists, an FFAR3 antagonist, nifedipine, diazoxide and 2,4-dinitrophenol
    limitations
    An isolated organ preparation with an intact blood supply. It reaches the opposite mechanistic conclusion from the knockout work in this collection and is why the receptor route is recorded as disputed.
    nutrient_topic
    Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. · Acetic acid
    organism
    Rat
    plain_language
    The natural fatty acids are weak at this receptor; a synthetic drug is hundreds of times stronger.
    primary_references
    [acetate-p29494208] The impact of short-chain fatty acids on GLP-1 and PYY secretion from the isolated perfused rat colon. (2018). https://pubmed.ncbi.nlm.nih.gov/29494208/ DOI: 10.1152/ajpgi.00346.2017
    tissue_or_cell_type
    Colon

    Acetic acid: the ingested acid, the receptors acetate binds, the acetyl-CoA it becomes, and the acetyl groups that reach histones (2026-09-21) · lines 355–366

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology · source_derived_draft · unverified_draft

    ### acetate-weak-partial-agonism Receptor studies confirmed acetate, propionate and butyrate to be low-potency partial agonists of FFAR2 compared with the synthetic agonist CFMB, which is a full agonist with roughly 750-fold higher potency than the short-chain fatty acids. Condition category: normal nutrient_topic: Acetic acid research collection; topical membership is not evidence of a direct clinical effect, and the ingested acid is recorded separately from the circulating acetate anion. plain_language: The natural fatty acids are weak at this receptor; a synthetic drug is hundreds of times stronger. organism: Rat tissue_or_cell_type: Colon experimental_model: Isolated perfused rat colon with luminal and vascular short-chain fatty acid infusion and receptor pharmacology limitations: An isolated organ preparation with an intact blood supply. It reaches the opposite mechanistic conclusion from the knockout work in this collection and is why the receptor route is recorded as disputed. exposure: Acetate, propionate and butyrate perfused luminally or vascularly, with FFAR2/FFAR3 agonists, an FFAR3 antagonist, nifedipine, diazoxide and 2,4-dinitrophenol evidence_span: {"source_cache": "artifacts/acetate-research/29494208.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126", "start_char": 0, "end_char": 2445, "text_sha256": "9f8def7b832fdd5d5aed67891c84b18b597d558d9361a92412ccc44264b88126"} [acetate-p29494208] The impact of short-chain fatty acids on GLP-1 and PYY secretion from the isolated perfused rat colon. (2018). https://pubmed.ncbi.nlm.nih.gov/29494208/ DOI: 10.1152/ajpgi.00346.2017
    Complete structured claim and evidence

In the sources

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    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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