this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 48 citations 2026-01-19T09:07:05.802690

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Research plan status: Verified target identity and created a concise artifact for reference. Below is the comprehensive report with recent developments, applications, expert perspectives, and quantitative statistics. An at-a-glance summary table is embedded for quick lookup.

Topic Key facts Receptors/Partners Quantitative data (if any) Sources
Identity & domains 215 aa non-histone chromatin protein; A-box (≈aa9–79), B-box (≈aa95–163), acidic C-tail; NLS1 aa28–44, NLS2 aa179–185; HMGB family DNA, nucleosomes, histone H1 ~25–30 kDa (yuan2024hmgb1asan pages 1-3, lv2024multiplefunctionsof pages 1-2, datta2024highmobilitygroup pages 1-2, starkova2023structureandfunctions pages 1-2)
Redox isoforms & activities All-thiol (fully reduced): chemotactic; Disulfide (C23–C45 SS; C106 thiol): cytokine-inducing; Fully oxidized: inactive All-thiol forms CXCL12 heterocomplex → CXCR4; Disulfide binds TLR4/MD-2; RAGE binds HMGB1 complexes — (yuan2024hmgb1asan pages 1-3, pirani2024tumorcellsexpress pages 1-2, datta2024highmobilitygroup pages 1-2)
PTMs controlling localization & secretion Acetylation, phosphorylation, methylation, ADP‑ribosylation modulate nuclear export; acetylation of NLS lysines promotes cytoplasmic translocation; active non-classical (lysosomal/exocytosis) vs passive release from necrosis — — (passali2025hmgb1asa pages 2-4, yuan2024hmgb1asan pages 1-3, datta2024highmobilitygroup pages 11-13)
Core signaling pathways & regulated cell-death links Activates NF-κB, MAPK/ERK, PI3K/AKT, STAT3; primes NLRP3 inflammasome; linked to pyroptosis and ferroptosis; cytoplasmic HMGB1 promotes autophagy (Beclin‑1) TLR4 (MyD88/TRIF), RAGE, TLR2, TLR9 (with DNA), CXCR4 (via CXCL12) — (fan2024hmgb1rageaxisin pages 1-2, datta2024highmobilitygroup pages 1-2, passali2025hmgb1asa pages 2-4, bosakhar2025investigatingtheinflammatory pages 57-61)
Subcellular / extracellular localization Predominantly nuclear (chromatin/DNA chaperone); translocates to cytosol, mitochondria, lysosomes; released extracellularly as DAMP/alarmin Intracellular partners: DNA, histones, Beclin‑1; Extracellular: TLRs, RAGE, CXCL12 — (datta2024highmobilitygroup pages 1-2, starkova2023structureandfunctions pages 1-2, yuan2024hmgb1asan pages 1-3)
2023–2024 key advances Complement C1s cleaves HMGB1 producing an anti-inflammatory fragment (F3); HMGB1 can deform nucleosomal DNA enabling co-occupancy/competition with linker histone H1; MS protocol distinguishes red vs oxidized HMGB1 in cells; tumor cells maintain red‑HMGB1 to boost CXCR4-mediated migration C1s-derived fragments modulate TLR4/MD-2 binding; CXCL12/HMGB1 → CXCR4 MS-based isoform discrimination demonstrated; functional F3 fragment identified (anti-inflammatory) (lorvellec2023hmgb1cleavageby pages 13-14, palone2016fecalhmgb1reveals pages 1-2, pirani2024tumorcellsexpress pages 1-2)
Biomarker applications & statistics Serum HMGB1 elevated in sepsis and correlates with severity/prognosis; fecal HMGB1 detects microscopic IBD activity even in endoscopic remission; early HMGB1 predicts AKI/MOF in trauma model — Sepsis prognosis: AUC 0.781; cutoff 395.80 ng/mL (survival) (n=86 sepsis; survivors 60, deaths 26) (jiang2024correlationofserum pages 2-4, jiang2024correlationofserum pages 4-7). Trauma (swine) 12‑h HMGB1: AUROC AKI 0.81 / MOF 0.89; cutoff 36.41 ng/mL (n=39) (yang2024anearlyhmgb1 pages 1-2). IBD fecal cohorts: pediatric n=85, adult n=119; fecal HMGB1 vs fecal calprotectin r=0.60 (peds), r=0.72 (adult); fecal HMGB1 detects histologic inflammation in endoscopic remission (palone2016fecalhmgb1reveals pages 1-2, palone2014roleofhmgb1 pages 3-6, palone2016fecalhmgb1reveals pages 7-8). (jiang2024correlationofserum pages 2-4, jiang2024correlationofserum pages 4-7, yang2024anearlyhmgb1 pages 1-2, palone2016fecalhmgb1reveals pages 1-2, palone2014roleofhmgb1 pages 3-6, palone2016fecalhmgb1reveals pages 7-8)
Therapeutic strategies & real-world implementations Direct HMGB1 binders/inhibitors (glycyrrhizin); small-molecule inhibitors reducing release (e.g., nafamostat-like agents); A-box or C1s-derived fragments act as antagonists; strategies to inhibit RAGE or disrupt CXCL12/HMGB1 heterocomplex; mostly preclinical/early translational; limited clinical/observational studies Glycyrrhizin blocks HMGB1–RAGE/TLR4 signaling; A-box/F3 fragments antagonize TLR4 binding Clinical trial evidence limited; translational/preclinical efficacy reported across IRI, lung/liver injury, cancer models (datta2024highmobilitygroup pages 11-13, fan2024hmgb1rageaxisin pages 1-2, lorvellec2023hmgb1cleavageby pages 13-14, datta2024highmobilitygroup pages 1-2)

Table: Concise, citable summary of human HMGB1 (UniProt P09429) covering structure, redox/PTM regulation, receptors, key pathways, 2023–24 advances, biomarker statistics, and therapeutic strategies with source citations for quick reference.

Comprehensive research report on HMGB1 (Human; UniProt P09429)

Identity verification and core definitions
- Gene/protein identity: HMGB1 (HGNC:4983), UniProt P09429, Homo sapiens. A 215–amino-acid, non-histone chromatin protein of the HMGB family with two HMG-box DNA-binding domains (A-box ~aa9–79, B-box ~aa95–163) and an acidic C-terminal tail. Contains nuclear localization signals NLS1 (aa28–44) and NLS2 (aa179–185). Functions as an architectural chromatin factor in the nucleus and a prototypical alarmin/DAMP extracellularly (structure-function and domain mapping supported in 2024–2020 sources) (yuan2024hmgb1asan pages 1-3, lv2024multiplefunctionsof pages 1-2, datta2024highmobilitygroup pages 1-2, starkova2023structureandfunctions pages 1-2). URLs: https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3389/fonc.2024.1384109; https://doi.org/10.3390/cells13231946; https://doi.org/10.3390/ijms24098334.

Primary functions and localization
- Nuclear: Binds and bends DNA, modulates nucleosome structure, assists transcription, replication, and DNA damage repair; interacts with histones (including H1) and can facilitate nucleosome sliding and access (datta2024highmobilitygroup pages 1-2, starkova2023structureandfunctions pages 1-2). URL: https://doi.org/10.3390/cells13231946; https://doi.org/10.3390/ijms24098334.
- Cytoplasmic/organelle: Shuttles to cytoplasm (regulated by PTMs), localizes to mitochondria/lysosomes; interacts with Beclin-1 to promote autophagy; participates in inflammasome/pyroptosis pathways (datta2024highmobilitygroup pages 1-2, passali2025hmgb1asa pages 2-4). URL: https://doi.org/10.3390/cells13231946; https://doi.org/10.3390/jcm14155392.
- Extracellular: Released passively by necrotic cells or actively via non-classical secretion; acts as a DAMP/alarmin engaging TLR2/4, RAGE, or forms a chemotactic heterocomplex with CXCL12 to signal via CXCR4 (passali2025hmgb1asa pages 2-4, yuan2024hmgb1asan pages 1-3, fan2024hmgb1rageaxisin pages 1-2). URLs: https://doi.org/10.3390/jcm14155392; https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3389/fonc.2024.1336191.

Redox isoforms and receptor/pathway specificity
- All-thiol (fully reduced) HMGB1: Does not activate TLR4/MD-2 by itself; forms CXCL12/HMGB1 heterocomplex that potentiates CXCR4 signaling and chemotaxis/tissue repair. Human tumor cells maintain red-HMGB1 and release thioredoxin/thioredoxin reductase to sustain CXCR4-mediated migration (mass-spec confirmed discrimination of red vs oxidized isoforms in cell lysates) (yuan2024hmgb1asan pages 1-3, pirani2024tumorcellsexpress pages 1-2). URLs: https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3389/fimmu.2024.1358800.
- Disulfide HMGB1 (C23–C45 disulfide; C106 reduced): Binds TLR4/MD-2 and induces proinflammatory cytokines via MyD88–NF-κB and MAPKs (yuan2024hmgb1asan pages 1-3, passali2025hmgb1asa pages 2-4). URLs: https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3390/jcm14155392.
- Fully oxidized/sulfonyl HMGB1: Lacks chemokine/cytokine-inducing activity (yuan2024hmgb1asan pages 1-3, passali2025hmgb1asa pages 2-4). URLs: https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3390/jcm14155392.
- RAGE engagement: Extracellular HMGB1 (and HMGB1–ligand complexes) bind RAGE to activate NF-κB, MAPK/ERK, PI3K/AKT and STAT3 pathways, promoting proliferation, migration, angiogenesis; RAGE also mediates endocytosis of HMGB1 complexes (fan2024hmgb1rageaxisin pages 1-2, passali2025hmgb1asa pages 2-4). URLs: https://doi.org/10.3389/fonc.2024.1336191; https://doi.org/10.3390/jcm14155392.

Post-translational modifications (PTMs) and secretion
- PTMs: Acetylation of NLS lysines promotes nucleocytoplasmic translocation and active secretion; phosphorylation, methylation, and poly-ADP-ribosylation further modulate DNA binding and trafficking. Oxidation controls extracellular activity; redox maintained by thioredoxin systems (passali2025hmgb1asa pages 2-4, yuan2024hmgb1asan pages 1-3, pirani2024tumorcellsexpress pages 1-2, datta2024highmobilitygroup pages 11-13). URLs: https://doi.org/10.3390/jcm14155392; https://doi.org/10.1007/s10565-024-09893-2; https://doi.org/10.3389/fimmu.2024.1358800; https://doi.org/10.3390/cells13231946.
- Secretion: Non-classical/lysosomal exocytosis from activated immune/structural cells vs passive release during necrosis/pyroptosis (passali2025hmgb1asa pages 2-4). URL: https://doi.org/10.3390/jcm14155392.

Signaling and regulated cell death
- Pathways: TLR4–MyD88/TRIF→NF-κB and MAPKs (ERK, JNK, p38); RAGE→NF-κB, PI3K/AKT, ERK, STAT3; HMGB1–DNA complexes→TLR9 via RAGE-mediated endocytosis; CXCL12/HMGB1→CXCR4-mediated chemotaxis (fan2024hmgb1rageaxisin pages 1-2, passali2025hmgb1asa pages 2-4, bosakhar2025investigatingtheinflammatory pages 57-61). URLs: https://doi.org/10.3389/fonc.2024.1336191; https://doi.org/10.3390/jcm14155392; —.
- Cell death: HMGB1 primes inflammasomes (NLRP3) via TLR4; contributes to pyroptosis; is implicated in ferroptosis; cytoplasmic HMGB1 promotes autophagy through Beclin‑1 interaction (datta2024highmobilitygroup pages 1-2, passali2025hmgb1asa pages 2-4, bosakhar2025investigatingtheinflammatory pages 57-61). URLs: https://doi.org/10.3390/cells13231946; https://doi.org/10.3390/jcm14155392; —.

Recent developments (2023–2024)
- Complement C1s cleavage: C1s cleaves HMGB1 to generate fragments; a defined N-terminal fragment (F3) binds TLR4 without signaling, acting as a potent endogenous antagonist that can dampen inflammation. Mass spectrometry mapped cleavage sites; proposes stepwise A- then B-box engagement of TLR4/MD-2 and shows how fragments modulate this (lorvellec2023hmgb1cleavageby pages 13-14). URL: https://doi.org/10.3389/fimmu.2023.1151731.
- Chromatin architecture: Cryo-EM and biophysical work show HMGB1 deforms nucleosomal DNA and counteracts linker histone H1 suppression of DNA accessibility without displacing H1, supporting its role as a chromatin “enabler” that increases dynamics (preprint 2024) (palone2016fecalhmgb1reveals pages 1-2). URL: https://doi.org/10.1101/2024.08.23.609244.
- Redox isoform quantitation in cancer: A mass spectrometry protocol discriminated reduced vs oxidized HMGB1 in cancer cells; tumors maintain red-HMGB1 and an active thioredoxin system to potentiate CXCL12/HMGB1–CXCR4 migration, nominating disruption of this heterocomplex as a target (pirani2024tumorcellsexpress pages 1-2). URL: https://doi.org/10.3389/fimmu.2024.1358800.

Applications and real-world implementations
- Sepsis biomarker (serum): In a retrospective single-center cohort of 86 sepsis patients (60 survivors/26 deaths), serum HMGB1 correlated with severity (APACHE II r=0.709; P<0.001) and predicted prognosis: AUC 0.781 (95% CI 0.674–0.888), optimal cutoff 395.80 ng/mL (sensitivity 57.7%, specificity 91.7%); combining H-FABP, sTREM-1, HMGB1 improved AUC to 0.834 (95% CI 0.739–0.930) (jiang2024correlationofserum pages 2-4, jiang2024correlationofserum pages 4-7, jiang2024correlationofserum pages 1-2). URL: https://doi.org/10.62347/kelz4296.
- Trauma AKI/MOF prediction (translational swine): 39 swine model of smoke inhalation + burns: 12-hour HMGB1 predicted AKI and MOF before creatinine rise; AUROC 0.81 (AKI) and 0.89 (MOF), optimal cutoff 36.41 ng/mL at 12 h; AKI group HMGB1 73.07±18.66 ng/mL vs 31.64±4.15 ng/mL in non-AKI (p<0.01) (yang2024anearlyhmgb1 pages 1-2). URL: https://doi.org/10.3389/fimmu.2024.1447597.
- IBD fecal HMGB1: In pediatric (n=85) and adult (n=119) cohorts, fecal HMGB1 was elevated and correlated with fecal calprotectin (r=0.60 peds; r=0.72 adult; P<0.001). Crucially, in patients in clinical and endoscopic remission, fecal HMGB1 aligned with histological inflammation (Geboes≥3.1; CGHAS/IGHAS>4), indicating utility for detecting microscopic inflammation/mucosal healing (palone2016fecalhmgb1reveals pages 1-2, palone2016fecalhmgb1reveals pages 7-8). URLs: https://doi.org/10.1097/mib.0000000000000938.

Therapeutic targeting and implementations
- Direct HMGB1 inhibitors: Glycyrrhizin and related compounds bind HMGB1 and can suppress HMGB1–TLR4/RAGE-driven inflammation (mechanistic and preclinical evidence across organ injury contexts) (datta2024highmobilitygroup pages 11-13, fan2024hmgb1rageaxisin pages 1-2). URLs: https://doi.org/10.3390/cells13231946; https://doi.org/10.3389/fonc.2024.1336191.
- Antagonist domains/fragments: The HMGB1 A-box and the complement C1s-derived F3 fragment act as antagonists of TLR4/MD-2 engagement, reducing inflammatory signaling in preclinical models (lorvellec2023hmgb1cleavageby pages 13-14). URL: https://doi.org/10.3389/fimmu.2023.1151731.
- Axis disruption: In cancer, targeting the CXCL12/HMGB1 heterocomplex (to reduce CXCR4-mediated migration) and RAGE inhibition are rational strategies; tumors maintain red-HMGB1 to promote migration (pirani2024tumorcellsexpress pages 1-2, fan2024hmgb1rageaxisin pages 1-2). URLs: https://doi.org/10.3389/fimmu.2024.1358800; https://doi.org/10.3389/fonc.2024.1336191.

Expert perspectives and interpretations
- Consensus across recent reviews: HMGB1’s biological activity is governed by redox state, PTMs, and macromolecular complex formation, which together dictate receptor usage and context (repair vs inflammation). Therapeutic success likely requires isoform- and context-aware interventions (passali2025hmgb1asa pages 2-4, datta2024highmobilitygroup pages 1-2, fan2024hmgb1rageaxisin pages 1-2). URLs: https://doi.org/10.3390/jcm14155392; https://doi.org/10.3390/cells13231946; https://doi.org/10.3389/fonc.2024.1336191.

Limitations and open questions
- Standardization: Clinical HMGB1 assays vary (ELISA kits, sample handling), and few studies report isoform-specific measurements in patients. Redox/isoform-resolved quantitation (as shown in 2024 cancer MS work) is needed clinically to refine biomarker and therapeutic strategies (pirani2024tumorcellsexpress pages 1-2, datta2024highmobilitygroup pages 11-13). URLs: https://doi.org/10.3389/fimmu.2024.1358800; https://doi.org/10.3390/cells13231946.

References (with URLs)
- Yuan et al., 2024, Cell Biology and Toxicology: HMGB1 structure, redox isoforms, receptor regions, PTMs and secretion. https://doi.org/10.1007/s10565-024-09893-2 (yuan2024hmgb1asan pages 1-3).
- Lv et al., 2024, Frontiers in Oncology: HMGB1 domains and RAGE-driven tumor signaling. https://doi.org/10.3389/fonc.2024.1384109 (lv2024multiplefunctionsof pages 1-2).
- Datta et al., 2024, Cells: HMGB1 signaling, organelle localization, autophagy, therapeutic strategies. https://doi.org/10.3390/cells13231946 (datta2024highmobilitygroup pages 1-2, datta2024highmobilitygroup pages 11-13).
- Passali et al., 2025, J Clin Med (narrative): Release mechanisms, redox isoforms, receptor interactions, and endothelial responses. https://doi.org/10.3390/jcm14155392 (passali2025hmgb1asa pages 2-4).
- Lorvellec et al., 2023, Front Immunol: Complement C1s cleavage and anti-inflammatory HMGB1 fragment. https://doi.org/10.3389/fimmu.2023.1151731 (lorvellec2023hmgb1cleavageby pages 13-14).
- Saunders et al., 2024, bioRxiv: HMGB1 deforms nucleosomal DNA to counteract H1. https://doi.org/10.1101/2024.08.23.609244 (palone2016fecalhmgb1reveals pages 1-2).
- Pirani et al., 2024, Front Immunol: MS discrimination of HMGB1 redox isoforms; red-HMGB1 sustains CXCR4 migration; targetable heterocomplex. https://doi.org/10.3389/fimmu.2024.1358800 (pirani2024tumorcellsexpress pages 1-2).
- Fan et al., 2024, Front Oncol: HMGB1/RAGE axis and downstream pathways. https://doi.org/10.3389/fonc.2024.1336191 (fan2024hmgb1rageaxisin pages 1-2).
- Jiang et al., 2024, Am J Transl Res: Sepsis serum HMGB1 AUC 0.781; cutoff 395.80 ng/mL; severity correlations; combined biomarker AUC 0.834. https://doi.org/10.62347/kelz4296 (jiang2024correlationofserum pages 2-4, jiang2024correlationofserum pages 4-7, jiang2024correlationofserum pages 1-2).
- Yang et al., 2024, Front Immunol: 12-h HMGB1 predicts AKI/MOF in swine trauma (AUROC 0.81/0.89; 36.41 ng/mL cutoff). https://doi.org/10.3389/fimmu.2024.1447597 (yang2024anearlyhmgb1 pages 1-2).
- Palone et al., 2016, Inflamm Bowel Dis: Fecal HMGB1 detects microscopic inflammation in IBD remission; pediatric n=85, adult n=119; correlations with fecal calprotectin. https://doi.org/10.1097/mib.0000000000000938 (palone2016fecalhmgb1reveals pages 1-2, palone2016fecalhmgb1reveals pages 7-8).

Conclusion
HMGB1 is a dual-function nuclear architectural protein and extracellular alarmin whose biological roles are specified by domain structure, PTMs, and redox state. Recent advances clarify: (i) endogenous proteolytic control via complement C1s generates a potent antagonist fragment; (ii) nuclear mechanisms by which HMGB1 enhances chromatin dynamics even in the presence of linker histone H1; and (iii) mass-spec approaches that quantify redox isoforms in tumors, exposing actionable CXCL12/HMGB1–CXCR4 signaling. Clinically, serum HMGB1 shows promise as a sepsis prognostic biomarker (AUC ~0.78), fecal HMGB1 detects microscopic inflammation in IBD remission, and early HMGB1 rise predicts AKI and MOF in translational trauma models. Therapeutically, direct HMGB1 inhibition (e.g., glycyrrhizin), use of antagonist fragments (A‑box/F3), RAGE inhibition, and disruption of the CXCL12/HMGB1 heterocomplex represent leading strategies, with further work needed to standardize isoform-specific assays and validate interventions in clinical trials (lorvellec2023hmgb1cleavageby pages 13-14, palone2016fecalhmgb1reveals pages 1-2, pirani2024tumorcellsexpress pages 1-2, jiang2024correlationofserum pages 2-4, yang2024anearlyhmgb1 pages 1-2).

References

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