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Open research questions in Proteoglycans and glycosaminoglycans research

136 gap statements mined from Proteoglycans and glycosaminoglycans research papers in our 4.5M-paper local library, which holds 530 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Limited comparative studies with other desulfated heparins. Need for dose–response and safety evaluation in human trials.

    Emerging Role, Molecular Mechanisms, and Therapeutic Potential of 2-O, 3-O Desulfated Heparin (ODSH) Across Inflammatory and Vascular Diseases · 2026 · DOI

  • The prognostic significance of SULF2 expression in surgically resected NSCLC is not well understood. Current evidence on the prognostic role of SULF2 expression in early-stage disease is limited and inconsistent.

    Prognostic Significance of SULF2 Expression in Surgically Resected Non-Small Cell Lung Cancer · 2026 · DOI

  • Prior studies have not fully addressed the challenges associated with GAG heterogeneity and immobilization.

    Probing Glycosaminoglycan–Protein Interactions: Applications of Surface Plasmon Resonance · 2026 · DOI

  • The lack of understanding of GAG utilization gene clusters in marine Bacteroidetes. The need to identify and characterize novel GAG-lyases with unique substrate specificities. The gap in knowledge of the capacity of Roseihalotalea indica gen.

    Identification of an Unpredicted GAG-PUL in Roseihalotalea indica gen. nov. sp. nov. TK19036T and Characterization of Novel GAG-Lyases with Unique Substrate Specificities · 2026 · DOI

  • Producing monodisperse hyaluronic acid with high purity and safety is a challenge. The high cost of nucleotide sugars needed for hyaluronic acid synthesis is a limitation. The complexity of hyaluronic acid synthases and their structure and function is a challenge for understanding their role in hyaluronic acid production.

    Hyaluronic Acid and Its Synthases—Current Knowledge · 2025 · DOI

  • Limited understanding of the structure-function relationships of GAGs. Need for new anticoagulants with selective activity.

    Bioactive Glycosaminoglycans from Caranx crysos: A Structure–Function Study of Selective Anticoagulant Activity · 2026 · DOI

  • Modulating HAS function to control HA molecular weight has become a research focus, yet its underlying mechanisms remain poorly understood due to the enzyme's small size, complex membrane-bound nature, and unresolved catalytic mechanism.

    Recent Advances in the Evolutionary Classification and Structural Insights of Hyaluronan Synthase · 2026 · DOI

  • Efficient myelin regeneration requires coordinated signaling between oligodendrocyte progenitor cells (OPCs) and the extracellular matrix, yet how specific heparan sulfate sulfation patterns regulate this process remains poorly understood.

    Hierarchical control of remyelination by heparan sulfate sulfation · 2026 · DOI

  • However, how specific stromal–immune interactions contribute to PM heterogeneity and immunotherapy resistance remains unclear.

    Hyaluronic acid-CD44 signaling defines therapeutic resistance and immunosuppressive microenvironment in peritoneal metastasis of gastric cancer · 2026 · DOI

  • The relationship between the extracellular matrix and the host immune response to infection is severely understudied.

    The hyaluronan receptor CD44 drives COVID-19 severity through its regulation of neutrophil migration · 2026 · DOI

  • Puerarin, a natural isoflavone with established anti-tumorigenic effects in diverse cancers, remains underexplored in melanoma despite its potential to modulate melanogenesis and oxidative stress.

    Comprehensive analysis based on spatial domains identifies CD44 as a potential target of puerarin · 2025 · DOI

  • The Edn1/Ednra signaling pathway establishes the identity of lower jaw progenitor cells by regulating expression of numerous patterning genes, but the intracellular signaling mechanisms linking receptor activation to gene regulation remain poorly understood.

    The Gq/11 family of Gα subunits is necessary and sufficient for lower jaw development · 2025 · DOI

  • YKL-40 is a chitinase-like glycoprotein implicated in various pathological processes, yet its glycosaminoglycan (GAG) binding profile beyond heparin has not been examined.

    Characterization of YKL-40 Binding to Extracellular Matrix Glycosaminoglycans · 2025 · DOI

  • Our previous work implicates Gα13/RhoA-mediated signaling in regulating this process, but the underlying mechanisms remain unclear.

    Gα13 controls pharyngeal endoderm convergence by regulating E-cadherin expression and RhoA activation · 2024 · DOI

  • Compelling evidence indicates that salivary gland ducts mediate fluid secretion, yet the specific cell types responsible for this process remain unclear.

    Unveiling the Mechanisms of Fluid Secretion in Parotid Gland Ducts: CFTR Dependency, Cellular Contributors, and Signaling Pathways · 2024 · DOI

  • However, the anti-angiogenic activity of SBSG and its mechanism has not been reported.

    Elucidating the molecular mechanism of angiogenic activity of sulfate glycosaminoglycan derived from fish swim bladder in human umbilical vein endothelial cells · 2024 · DOI

  • However, the effects of hypoxia on ECs and associated ECM proteins are poorly understood.

    Hypoxia promotes the generation of a versican-rich extracellular matrix by human coronary artery endothelial cells · 2025 · DOI

  • However, despite this growing interest in PNNs, the mechanisms by which they modulate neural functions are poorly understood.

    Contactin-1 is a critical neuronal cell surface receptor for perineuronal net structure · 2025 · DOI

  • Clinical trials with PEGPH20 targeting HA have shown mixed results, indicating the complexity of HA’s role in the tumor microenvironment.

    Hyaluronic acid and its role in pancreatic cancer: Mechanisms of tumor progression, drug resistance, and therapeutic targeting · 2025 · DOI

  • Further study on the exact function of the N-terminal 'Alginate_lyase' module, - Investigation into the reason for the discrepancy between the enzymatic activity and the sole carbon source cultivation findings, - Elucidation of the effects of increased Ca 2+ levels on the enzymatic activity…

    Identification of an Unpredicted GAG-PUL in Roseihalotalea indica gen. nov. sp. nov. TK19036T and Characterization of Novel GAG-Lyases with Unique Substrate Specificities · 2026 · DOI

  • Further structural optimization of glycomimetic targeting P-selectin, - Development of high-efficacy drug candidates, - Investigation of the therapeutic potential of FG…

    P-Selectin Inhibition and the Structure–Activity Relationship of Sea Cucumber-Derived Fucosylated Glycosaminoglycan Oligosaccharides · 2026 · DOI

  • Common industrial approaches have limits in fulfilling the requests for monodisperse HA production, - The nucleotide sugars needed for HA synthesis using HASs are costly…

    Hyaluronic Acid and Its Synthases—Current Knowledge · 2025 · DOI

  • HA has a low level of cell adherence and rapidly disappears after injection, - pure hydrogels frequently exhibit limited mechanical…

    Progress in Hyaluronan-Based Nanoencapsulation Systems for Smart Drug Release and Medical Applications · 2025 · DOI

  • The study had a limited sample size, - The number of events was limited, - The study…

    Prognostic Significance of SULF2 Expression in Surgically Resected Non-Small Cell Lung Cancer · 2026 · DOI

  • Further investigation of structural preferences revealed that GAGases selectively act on GAG domains composed of non/6-O-/N-sulfated hexosamines and d-glucoronic acids as well as on alginate domains composed of d-mannuronic acids.

    Discovery of a class of glycosaminoglycan lyases with ultrabroad substrate spectrum and their substrate structure preferences · 2024 · DOI

Most-cited papers in Proteoglycans and glycosaminoglycans research

Most recent work

Find a gap in your own Proteoglycans and glycosaminoglycans research sub-topic

This page shows what the Proteoglycans and glycosaminoglycans research literature already flags as unresolved. To narrow it to your specific question, search the Research Gap Finder: the search is free with a free account and lists the papers closest to your topic first. Unlocking that topic (50 credits, charged once) fills the comparison table from our 4.5M-paper local library and writes the gaps from its rows.

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Open questions raised by papers listed on this page include: (1) The prognostic significance of SULF2 expression in surgically resected NSCLC is not well understood (“Prognostic Significance of SULF2 Expression in Surgically Resected Non-Small…”, 2026); (2) The lack of understanding of GAG utilization gene clusters in marine Bacteroidetes (“Identification of an Unpredicted GAG-PUL in Roseihalotalea indica gen. nov. sp.”, 2026); (3) Modulating HAS function to control HA molecular weight has become a research focus, yet its underlying mechanisms remain poorly understood due to the enzyme's small size, complex membrane-bound nature, and unresolved catalytic mechanism (“Recent Advances in the Evolutionary Classification and Structural Insights of…”, 2026); (4) Efficient myelin regeneration requires coordinated signaling between oligodendrocyte progenitor cells (OPCs) and the extracellular matrix, yet how specific heparan sulfate sulfation patterns regulate this process remains poorly understood (“Hierarchical control of remyelination by heparan sulfate sulfation”, 2026); (5) How specific stromal–immune interactions contribute to PM heterogeneity and immunotherapy resistance remains unclear (“Hyaluronic acid-CD44 signaling defines therapeutic resistance and…”, 2026). 136 gap statements have been mined from Proteoglycans and glycosaminoglycans research papers in our 4.5M-paper local library, which holds 530 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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