{"id":"a84321ca-92c3-51c7-a696-21f539f7b07d","stable_key":"1ff3a29f-ef80-5bff-9300-30b98c60b90d:strontium-human-maturation","predicate":"induces","statement":"Strontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.","claim_class":"mechanistic","status":"source_derived_draft","evidence_grade":"ungraded","direction":"context_dependent","is_public":true,"mechanism_event_id":"da6fe860-3c88-5c0e-965e-3cc0fa077651","mechanism_event_label":"Cell maturity and exposure can change which markers rise.","subject":{"id":"a319eca8-b0ed-5a8c-8659-e7f106bed73a","slug":"strontium-ranelate","display_name":"Strontium ranelate","entity_type_key":"chemical_species"},"object":{"id":"27b8a167-2802-5f7a-af0a-dc4d631d955c","slug":"human-strontium-osteocyte-like-phenotype","display_name":"Osteocyte-like phenotype in strontium-treated human cultures","entity_type_key":"cellular_process"},"evidence_count":1,"mechanism_event":{"id":"da6fe860-3c88-5c0e-965e-3cc0fa077651","stable_key":"1ff3a29f-ef80-5bff-9300-30b98c60b90d:strontium-human-maturation-event","event_type":"observed_relationship","label":"Cell maturity and exposure can change which markers rise.","description":"Strontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"a319eca8-b0ed-5a8c-8659-e7f106bed73a","slug":"strontium-ranelate","display_name":"Strontium ranelate","entity_type_key":"chemical_species"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"27b8a167-2802-5f7a-af0a-dc4d631d955c","slug":"human-strontium-osteocyte-like-phenotype","display_name":"Osteocyte-like phenotype in strontium-treated human cultures","entity_type_key":"cellular_process"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""},{"entity":{"id":"2ca2864b-1ef0-54e4-8397-1dbe7207a0d2","slug":"strontium","display_name":"Strontium","entity_type_key":"nutrient_element"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":2,"notes":""},{"entity":{"id":"9aaf8b7f-26e8-56b1-881f-f323c151598c","slug":"sost","display_name":"Human sclerostin / SOST","entity_type_key":"protein"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":3,"notes":""},{"entity":{"id":"39c2586f-4226-5dfc-8a30-add8d5c1fb73","slug":"dmp1","display_name":"Human dentin matrix protein 1 / DMP1","entity_type_key":"protein"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":4,"notes":""}]},"contexts":[{"dimension":"evidence_access","value_text":"Primary abstract","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Long-term adult human primary osteoblast cultures.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"High culture concentration; SOST transcript increase is not a direct contradiction of a different study measuring sclerostin protein.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit.","comparator":null,"unit":null,"notes":"","entity":{"slug":"strontium","display_name":"Strontium","entity_type_key":"nutrient_element"}},{"dimension":"plain_language","value_text":"Cell maturity and exposure can change which markers rise.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"Strontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"07d0b042-f777-5445-a12c-bd3e448e733e","evidence_kind":"source_excerpt","locator":"Lines 206-212","start_line":206,"end_line":212,"excerpt":"## strontium-human-maturation\nCell maturity and exposure can change which markers rise.\nStrontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.\nModel: Long-term adult human primary osteoblast cultures.\nLimitations: High culture concentration; SOST transcript increase is not a direct contradiction of a different study measuring sclerostin protein.\nEvidence access: Primary abstract\nStrontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6","model_system":"Long-term adult human primary osteoblast cultures.","directness":"reported_statement","verification_status":"source_derived_draft","notes":"Original curation paraphrase; evidence access and experimental limitations specified.","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"43ef0fe7-eb6c-5346-8381-f7694733b4dc","stable_key":"import-1ff3a29f-ef80-5bff-9300-30b98c60b90d","title":"Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19)","document_type":"imported_text","citation_label":"AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text.","file_path":"","sha256":"51221949263cdf8a22a79c32e3989599de1a37dc215700e0a076f436b40a1005","revision_id":"84f6df49-c456-5ad2-8214-cc69d5dc7722","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[{"id":"86858c4a-aba2-5d12-854b-f26fa3ee999a","title":"Does strontium stimulate or inhibit osteoblast mineralization?","kind":"contradiction","status":"open","why":"Positive human osteoblast culture studies support a mineralization-promoting interpretation. The 2014 primary rat-culture study reports marked inhibition and explicitly challenges the general claim that strontium stimulates osteoblast function. The dispute concerns the general mechanism; species, concentration and culture differences remain visible.","resolution":"Keep both directions without declaring a universal stimulatory or inhibitory action. Compare soluble ion exposure, species, cell maturity, phosphate supply, duration and mineral assay. Matrix production, marker expression, mineral deposition, DXA attenuation and fracture risk are separate outcomes. Human biopsy observations do not by themselves settle the cell-culture disagreement.","created_at":"2026-09-19 09:10:24","record_type":"conflict","display_label":"Recorded conflict","record_url":"/conflicts/86858c4a-aba2-5d12-854b-f26fa3ee999a","sides":[{"conflict_id":"86858c4a-aba2-5d12-854b-f26fa3ee999a","ordinal":0,"label":"Human primary-culture stimulation","revision_id":"84f6df49-c456-5ad2-8214-cc69d5dc7722","start_line":190,"end_line":196,"quote":"## strontium-human-mineralization-positive\nThis study found more mineral deposition in its culture system.\nStrontium increased mineralization in primary human osteoblast cultures in the 2011 study.\nModel: Primary human osteoblast mineralization assay.\nLimitations: Later rat primary-culture work directly challenged a general mineralization-promoting interpretation; matched exposure and culture comparisons remain necessary.\nEvidence access: Primary abstract\nAn Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116","source_key":"import-1ff3a29f-ef80-5bff-9300-30b98c60b90d","source_title":"Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19)","claim_ids":["518edfb2-a9bc-5313-810c-fffeca586501"]},{"conflict_id":"86858c4a-aba2-5d12-854b-f26fa3ee999a","ordinal":1,"label":"Long-term human culture and high exposure","revision_id":"84f6df49-c456-5ad2-8214-cc69d5dc7722","start_line":206,"end_line":212,"quote":"## strontium-human-maturation\nCell maturity and exposure can change which markers rise.\nStrontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.\nModel: Long-term adult human primary osteoblast cultures.\nLimitations: High culture concentration; SOST transcript increase is not a direct contradiction of a different study measuring sclerostin protein.\nEvidence access: Primary abstract\nStrontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6","source_key":"import-1ff3a29f-ef80-5bff-9300-30b98c60b90d","source_title":"Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19)","claim_ids":["a84321ca-92c3-51c7-a696-21f539f7b07d"]},{"conflict_id":"86858c4a-aba2-5d12-854b-f26fa3ee999a","ordinal":2,"label":"Rat primary-culture inhibition","revision_id":"84f6df49-c456-5ad2-8214-cc69d5dc7722","start_line":270,"end_line":276,"quote":"## strontium-rat-mineralization-negative\nThis study found less mineral deposition, directly challenging a general stimulatory claim.\nContinuous strontium ranelate at 0.01, 0.1 and 1 mM caused 59%, 98% and 100% inhibition of mineralization in 14-day rat calvarial osteoblast cultures; strontium chloride also strongly inhibited it.\nModel: Primary rat osteoblast cultures; quantified mineralized nodules.\nLimitations: Full-text results clarify these numbers are percent inhibition, despite ambiguous abstract wording. Species, culture conditions and soluble exposure require matched comparison.\nEvidence access: Primary full text\nStrontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5","source_key":"import-1ff3a29f-ef80-5bff-9300-30b98c60b90d","source_title":"Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19)","claim_ids":["1a070e87-8033-5ec7-848d-c1dc6ec5a343"]}]}],"corrections":[],"research":null}