Component

1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8)

1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8). Species, exposure and limitations are retained in each linked claim.

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

Read recorded mechanisms Open recursive mind map

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. Liposomal delivery of a metabolically resistant InsP8 analog rescued phosphate efflux in PPIP5K-null cells; tested analogs of other inositol pyrophosphates did not.

    1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8) → Cellular inorganic phosphate export source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/inositol-research/32019887.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18", "start_char": 0, "end_char": 2004, "text_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18"}
    experimental_model
    Binding, knockout and rescue experiments
    exposure
    PPIP5K or XPR1 deletion, kinase rescue and pyrophosphate analog delivery
    limitations
    Cell assays establish a transport-regulation mechanism, not benefits of oral inositol or increased bone mineralization.
    nutrient_topic
    Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
    organism
    Human cultured cells including Saos-2 osteosarcoma cells
    plain_language
    The rescue was chemically selective, rather than an effect of any inositol compound.
    primary_references
    [ino-p32019887] Control of XPR1-dependent cellular phosphate efflux by InsP8 is an exemplar for functionally-exclusive inositol pyrophosphate signaling. (2020). https://pubmed.ncbi.nlm.nih.gov/32019887/ DOI: 10.1073/pnas.1908830117
    tissue_or_cell_type
    Cellular phosphate transport
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 899–910

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Binding, knockout and rescue experiments · source_derived_draft · unverified_draft

    ### ino-ip8-specific-rescue Liposomal delivery of a metabolically resistant InsP8 analog rescued phosphate efflux in PPIP5K-null cells; tested analogs of other inositol pyrophosphates did not. Condition category: machinery_impairment nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: The rescue was chemically selective, rather than an effect of any inositol compound. organism: Human cultured cells including Saos-2 osteosarcoma cells tissue_or_cell_type: Cellular phosphate transport experimental_model: Binding, knockout and rescue experiments limitations: Cell assays establish a transport-regulation mechanism, not benefits of oral inositol or increased bone mineralization. exposure: PPIP5K or XPR1 deletion, kinase rescue and pyrophosphate analog delivery evidence_span: {"source_cache": "artifacts/inositol-research/32019887.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18", "start_char": 0, "end_char": 2004, "text_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18"} [ino-p32019887] Control of XPR1-dependent cellular phosphate efflux by InsP8 is an exemplar for functionally-exclusive inositol pyrophosphate signaling. (2020). https://pubmed.ncbi.nlm.nih.gov/32019887/ DOI: 10.1073/pnas.1908830117
    Complete structured claim and evidence

  2. InsP8 bound the XPR1 N-terminal region with a reported dissociation constant of 180 nM.

    1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8) → XPR1 (human phosphate exporter) source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/inositol-research/32019887.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18", "start_char": 0, "end_char": 2004, "text_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18"}
    experimental_model
    Binding, knockout and rescue experiments
    exposure
    PPIP5K or XPR1 deletion, kinase rescue and pyrophosphate analog delivery
    limitations
    Cell assays establish a transport-regulation mechanism, not benefits of oral inositol or increased bone mineralization.
    nutrient_topic
    Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
    organism
    Human cultured cells including Saos-2 osteosarcoma cells
    plain_language
    A specific inositol pyrophosphate binds the phosphate-export machinery.
    primary_references
    [ino-p32019887] Control of XPR1-dependent cellular phosphate efflux by InsP8 is an exemplar for functionally-exclusive inositol pyrophosphate signaling. (2020). https://pubmed.ncbi.nlm.nih.gov/32019887/ DOI: 10.1073/pnas.1908830117
    tissue_or_cell_type
    Cellular phosphate transport

    Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 873–884

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Binding, knockout and rescue experiments · source_derived_draft · unverified_draft

    ### ino-xpr1-ip8 InsP8 bound the XPR1 N-terminal region with a reported dissociation constant of 180 nM. Condition category: normal nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: A specific inositol pyrophosphate binds the phosphate-export machinery. organism: Human cultured cells including Saos-2 osteosarcoma cells tissue_or_cell_type: Cellular phosphate transport experimental_model: Binding, knockout and rescue experiments limitations: Cell assays establish a transport-regulation mechanism, not benefits of oral inositol or increased bone mineralization. exposure: PPIP5K or XPR1 deletion, kinase rescue and pyrophosphate analog delivery evidence_span: {"source_cache": "artifacts/inositol-research/32019887.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18", "start_char": 0, "end_char": 2004, "text_sha256": "bb7637b9a327b1cba07716bbed5da8a3f32a3ac00c9fff70d23ada1a736d3d18"} [ino-p32019887] Control of XPR1-dependent cellular phosphate efflux by InsP8 is an exemplar for functionally-exclusive inositol pyrophosphate signaling. (2020). https://pubmed.ncbi.nlm.nih.gov/32019887/ DOI: 10.1073/pnas.1908830117
    Complete structured claim and evidence

  3. In the challenge model, InsP8-dependent XPR1 regulation first adjusted phosphate efflux.

    1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8) → Cellular inorganic phosphate export source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"}
    experimental_model
    Protein interaction, localization and phosphate-challenge cell experiments
    exposure
    Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge
    limitations
    Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human cultured HCT116, U2OS and Saos-2 systems
    plain_language
    An inositol pyrophosphate signal changed phosphate export.
    primary_references
    [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    tissue_or_cell_type
    Cellular phosphate uptake/export and LAMP1-positive puncta

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 750–761

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Protein interaction, localization and phosphate-challenge cell experiments · source_derived_draft · unverified_draft

    ### phosphorus-ip8-export In the challenge model, InsP8-dependent XPR1 regulation first adjusted phosphate efflux. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: An inositol pyrophosphate signal changed phosphate export. organism: Human cultured HCT116, U2OS and Saos-2 systems tissue_or_cell_type: Cellular phosphate uptake/export and LAMP1-positive puncta experimental_model: Protein interaction, localization and phosphate-challenge cell experiments limitations: Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement. exposure: Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge evidence_span: {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"} [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    Complete structured claim and evidence

What acts on it

  1. Phosphate starvation lowered ATP and 5-InsP7, while InsP8 showed a larger and more sensitive response; levels recovered with phosphate replenishment.

    Inorganic phosphate → 1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8) source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"}
    experimental_model
    Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics
    exposure
    Phosphate availability and PPIP5K kinase/phosphatase assays
    limitations
    Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical.
    nutrient_topic
    Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
    organism
    Human HCT116 cells and human PPIP5K proteins
    plain_language
    The signaling network detects phosphate supply instead of depending only on the amount of free inositol.
    primary_references
    [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    tissue_or_cell_type
    Intestinal tumor-derived cell line; purified enzymes
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 860–871

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics · source_derived_draft · unverified_draft

    ### ino-phosphate-ip8 Phosphate starvation lowered ATP and 5-InsP7, while InsP8 showed a larger and more sensitive response; levels recovered with phosphate replenishment. Condition category: nutrient_deficiency nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: The signaling network detects phosphate supply instead of depending only on the amount of free inositol. organism: Human HCT116 cells and human PPIP5K proteins tissue_or_cell_type: Intestinal tumor-derived cell line; purified enzymes experimental_model: Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics limitations: Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical. exposure: Phosphate availability and PPIP5K kinase/phosphatase assays evidence_span: {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"} [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    Complete structured claim and evidence

  2. PPIP5K proteins also possess InsP8 phosphatase activity, opposing their kinase reaction.

    Diphosphoinositol pentakisphosphate kinase family → 1,5-bisdiphosphoinositol tetrakisphosphate (1,5-InsP8) source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"}
    experimental_model
    Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics
    exposure
    Phosphate availability and PPIP5K kinase/phosphatase assays
    limitations
    Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical.
    nutrient_topic
    Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
    organism
    Human HCT116 cells and human PPIP5K proteins
    plain_language
    The same protein family can build and break down the signal.
    primary_references
    [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    tissue_or_cell_type
    Intestinal tumor-derived cell line; purified enzymes

    Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 821–832

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics · source_derived_draft · unverified_draft

    ### ino-ppip5k-reverse PPIP5K proteins also possess InsP8 phosphatase activity, opposing their kinase reaction. Condition category: normal nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: The same protein family can build and break down the signal. organism: Human HCT116 cells and human PPIP5K proteins tissue_or_cell_type: Intestinal tumor-derived cell line; purified enzymes experimental_model: Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics limitations: Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical. exposure: Phosphate availability and PPIP5K kinase/phosphatase assays evidence_span: {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"} [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. PPIP5K kinase activity converts 5-InsP7 to 1,5-InsP8.

    Diphosphoinositol pentakisphosphate kinase family → 5-diphosphoinositol pentakisphosphate (5-InsP7) source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"}
    experimental_model
    Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics
    exposure
    Phosphate availability and PPIP5K kinase/phosphatase assays
    limitations
    Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical.
    nutrient_topic
    Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
    organism
    Human HCT116 cells and human PPIP5K proteins
    plain_language
    A further phosphorylation step creates another distinct phosphate signal.
    primary_references
    [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    tissue_or_cell_type
    Intestinal tumor-derived cell line; purified enzymes

    Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 808–819

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics · source_derived_draft · unverified_draft

    ### ino-ppip5k-ip8 PPIP5K kinase activity converts 5-InsP7 to 1,5-InsP8. Condition category: normal nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: A further phosphorylation step creates another distinct phosphate signal. organism: Human HCT116 cells and human PPIP5K proteins tissue_or_cell_type: Intestinal tumor-derived cell line; purified enzymes experimental_model: Cellular phosphate withdrawal/repletion and bifunctional enzyme kinetics limitations: Cell-culture nutrient withdrawal is not a measured human dietary threshold; PPIP5K isoforms are not identical. exposure: Phosphate availability and PPIP5K kinase/phosphatase assays evidence_span: {"source_cache": "artifacts/inositol-research/28126903.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f", "start_char": 0, "end_char": 1981, "text_sha256": "6f5c96ed7d02591d5fe475d0e26aa2f21dc93f0c86c12998debb417f98254d2f"} [ino-p28126903] The Significance of the Bifunctional Kinase/Phosphatase Activities of Diphosphoinositol Pentakisphosphate Kinases (PPIP5Ks) for Coupling Inositol Pyrophosphate Cell Signaling to Cellular Phosphate Homeostasis. (2017). https://pubmed.ncbi.nlm.nih.gov/28126903/ DOI: 10.1074/jbc.m116.765743
    Complete structured claim and evidence

  2. The study reported later XPR1-dependent modulation of PiT1 turnover, resetting phosphate uptake after the earlier efflux response.

    XPR1 (human phosphate exporter) → Human PiT1 protein turnover source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"}
    experimental_model
    Protein interaction, localization and phosphate-challenge cell experiments
    exposure
    Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge
    limitations
    Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human cultured HCT116, U2OS and Saos-2 systems
    plain_language
    Changing transporter turnover adjusted how much phosphate entered later.
    primary_references
    [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    tissue_or_cell_type
    Cellular phosphate uptake/export and LAMP1-positive puncta

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 763–774

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Protein interaction, localization and phosphate-challenge cell experiments · source_derived_draft · unverified_draft

    ### phosphorus-ip8-uptake The study reported later XPR1-dependent modulation of PiT1 turnover, resetting phosphate uptake after the earlier efflux response. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: Changing transporter turnover adjusted how much phosphate entered later. organism: Human cultured HCT116, U2OS and Saos-2 systems tissue_or_cell_type: Cellular phosphate uptake/export and LAMP1-positive puncta experimental_model: Protein interaction, localization and phosphate-challenge cell experiments limitations: Temporal regulatory model in cultured cells; endogenous InsP8 signaling is not equivalent to taking an inositol or phytate supplement. exposure: Genetic manipulation and pharmacological mimic of phosphate homeostatic challenge evidence_span: {"source_cache": "artifacts/phosphorus-research/38833370.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78", "start_char": 0, "end_char": 1103, "text_sha256": "5c093accfcc7194268c0fbd19d3ee39aae4206e9b2feed48b76b2a95eee33b78"} [phosphorus-p38833370] Homeostatic coordination of cellular phosphate uptake and efflux requires an organelle-based receptor for the inositol pyrophosphate IP8. (2024). https://pubmed.ncbi.nlm.nih.gov/38833370/ DOI: 10.1016/j.celrep.2024.114316
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

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

    Evidence, AI assistance and curation standards