{"id":"a66a11d4-6abe-5a90-9ad8-c5815f04f90c","stable_key":"8b3cf083-ea9c-54f5-b42b-bf1fef5b2978:metformin-scfa-mediation","predicate":"increases","statement":"The reanalysis supported microbial mediation of metformin’s therapeutic effects through short-chain fatty acid production, while type 2 diabetes itself showed depletion of butyrate-producing taxa.","claim_class":"observational","status":"source_derived_draft","evidence_grade":"ungraded","direction":"positive","is_public":true,"mechanism_event_id":"41f4955b-165e-5e89-a0be-be61bdfb6b66","mechanism_event_label":"Part of the benefit may run through the fatty acids gut bacteria make.","subject":{"id":"519971b1-5aef-5ad7-8022-840144855cd0","slug":"metformin","display_name":"Metformin","entity_type_key":"drug"},"object":{"id":"e349741f-5fb3-5077-9646-f40f6e97cf07","slug":"short-chain-fatty-acid-production","display_name":"Microbial short-chain fatty acid production","entity_type_key":"cellular_process"},"evidence_count":1,"mechanism_event":{"id":"41f4955b-165e-5e89-a0be-be61bdfb6b66","stable_key":"8b3cf083-ea9c-54f5-b42b-bf1fef5b2978:metformin-scfa-mediation-event","event_type":"observed_intervention","label":"Part of the benefit may run through the fatty acids gut bacteria make.","description":"The reanalysis supported microbial mediation of metformin’s therapeutic effects through short-chain fatty acid production, while type 2 diabetes itself showed depletion of butyrate-producing taxa.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"519971b1-5aef-5ad7-8022-840144855cd0","slug":"metformin","display_name":"Metformin","entity_type_key":"drug"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"e349741f-5fb3-5077-9646-f40f6e97cf07","slug":"short-chain-fatty-acid-production","display_name":"Microbial short-chain fatty acid production","entity_type_key":"cellular_process"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""}]},"contexts":[{"dimension":"evidence_span","value_text":"{\"source_cache\": \"artifacts/metformin-research/26633628.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"f83ac1daddf6372ef8d16d3944ed9b6d62f0d1c12fb5815fb7c27cda2244f984\", \"start_char\": 0, \"end_char\": 1570, \"text_sha256\": \"f83ac1daddf6372ef8d16d3944ed9b6d62f0d1c12fb5815fb7c27cda2244f984\"}","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Reanalysis of 784 human gut metagenomes stratified by treatment","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"exposure","value_text":"Metformin treatment as a confounder in type 2 diabetes metagenomes","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"An observational reanalysis. It separates disease signature from drug signature; it does not measure a clinical outcome. A corrigendum was issued for this paper (Nature 2017;545:116, PMID 28470190); its notice body was not available, so its impact on these records has not been assessed.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Metformin research collection; topical membership is not evidence of a direct clinical effect, and pharmacological exposure is not dietary intake.","comparator":null,"unit":null,"notes":"","entity":{"slug":"metformin","display_name":"Metformin","entity_type_key":"drug"}},{"dimension":"organism","value_text":"Human","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"Part of the benefit may run through the fatty acids gut bacteria make.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"[metformin-p26633628] Disentangling type 2 diabetes and metformin treatment signatures in the human gut microbiota. (2015). https://pubmed.ncbi.nlm.nih.gov/26633628/ DOI: 10.1038/nature15766","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue_or_cell_type","value_text":"Gut microbiome","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"1354577c-3062-53c1-b95f-d81938106d8d","evidence_kind":"source_excerpt","locator":"Lines 944-955","start_line":944,"end_line":955,"excerpt":"### metformin-scfa-mediation\nThe reanalysis supported microbial mediation of metformin’s therapeutic effects through short-chain fatty acid production, while type 2 diabetes itself showed depletion of butyrate-producing taxa.\nCondition category: normal\nnutrient_topic: Metformin research collection; topical membership is not evidence of a direct clinical effect, and pharmacological exposure is not dietary intake.\nplain_language: Part of the benefit may run through the fatty acids gut bacteria make.\norganism: Human\ntissue_or_cell_type: Gut microbiome\nexperimental_model: Reanalysis of 784 human gut metagenomes stratified by treatment\nlimitations: An observational reanalysis. It separates disease signature from drug signature; it does not measure a clinical outcome. A corrigendum was issued for this paper (Nature 2017;545:116, PMID 28470190); its notice body was not available, so its impact on these records has not been assessed.\nexposure: Metformin treatment as a confounder in type 2 diabetes metagenomes\nevidence_span: {\"source_cache\": \"artifacts/metformin-research/26633628.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"f83ac1daddf6372ef8d16d3944ed9b6d62f0d1c12fb5815fb7c27cda2244f984\", \"start_char\": 0, \"end_char\": 1570, \"text_sha256\": \"f83ac1daddf6372ef8d16d3944ed9b6d62f0d1c12fb5815fb7c27cda2244f984\"}\n[metformin-p26633628] Disentangling type 2 diabetes and metformin treatment signatures in the human gut microbiota. (2015). https://pubmed.ncbi.nlm.nih.gov/26633628/ DOI: 10.1038/nature15766","model_system":"Reanalysis of 784 human gut metagenomes stratified by treatment","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study references: [metformin-p26633628] Disentangling type 2 diabetes and metformin treatment signatures in the human gut microbiota. (2015). https://pubmed.ncbi.nlm.nih.gov/26633628/ DOI: 10.1038/nature15766","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"d0474bd9-7cfd-5695-a152-12f3633a6813","stable_key":"import-8b3cf083-ea9c-54f5-b42b-bf1fef5b2978","title":"Metformin: transport, molecular targets, gut mechanisms and nutrient interactions (2026-09-19)","document_type":"imported_text","citation_label":"AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text.","file_path":"","sha256":"0b51d0759aeeb88ac5b3a6277245a196b2bb024d7c32ec89379ed428fb06bfb5","revision_id":"0405c75e-f06e-5af7-a642-1777802f6004","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}