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Open research questions in Ion Transport and Channel Regulation

133 gap statements mined from Ion Transport and Channel Regulation papers in our 4.5M-paper local library, which holds 542 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

  • Traditional methods for quantifying SSI have limited scalability and throughput. The need for more reliable and efficient methods for SSI quantification. The lack of robust analytical methods for SSI quantification in automated TEVC systems.

    Analysis of sodium self-inhibition of the epithelial sodium channel (ENaC) using classical and medium-throughput automated two-electrode voltage-clamp recordings · 2026 · DOI

  • The lack of a consensus on a common concept of the urinary concentrating mechanism. The need for a detailed understanding of the renal medulla's structure and function. The requirement for a mechanism that explains the creation of gradients of salt and urea in the medulla.

    Active salt transport and countercurrent exchange as the basis of urine concentration: a proposal grounded on the microanatomy of the renal medulla · 2026 · DOI

  • The lack of a thermodynamic model of Malpighian tubule function. The need to compare the entropy generation of the Malpighian tubule with the mammalian nephron. The uncertainty about the energy dissipation of the Malpighian tubule.

    Entropy generation in the Malpighian tubule and its comparison with the mammalian nephron · 2026 · DOI

  • By summarizing existing knowledge and pointing out open questions, this review offers an integrated perspective on how cells sense and integrate mechanical and electrical cues during volume regulation, and suggests important directions for future research.

    Mechano-electrical coupling in cell volume regulation: physical mechanisms, physiological functions, and challenges · 2026 · DOI

  • As an illustrative example, we applied this framework to the rat choroid plexus epithelium, a tissue characterized by a coupled, nonlinear transport network for which quantitative data are limited.

    Uncertainty-Aware Modeling in Integrated Epithelial Transport Networks · 2026 · DOI

  • While computational mechanistic models can provide insight into the coupled transport of substrates through complex networks of membrane transporters and channels, commonly used deterministic models are often constrained by uncertainty in model structure and in parameters derived from sparse and limited data.

    Uncertainty-Aware Modeling in Integrated Epithelial Transport Networks · 2026 · DOI

  • However, the underlying mechanism via chloride‐sensitive kinases remains unclear.

    Hypotonicity‐Induced WNK1 Phosphorylation Prevents H 2 O 2 ‐Induced Apoptosis in Vascular Smooth Muscle Cells · 2026 · DOI

  • Single-cell RNA sequencing suggests that the cortical TAL consists of at least three distinct cell types, but whether ROMK distribution aligns with these types remains unclear.

    Characterization of ROMK cellular heterogeneity along the mouse kidney thick ascending limb · 2025 · DOI

  • However, the signaling mechanisms underlying AQP4 localization remain poorly understood.

    SUR1 ‐ TRPM4 Regulates Aquaporin‐4 Subcellular Localization by Astrocytic Endfeet Calcium Signals Following Status Epilepticus · 2025 · DOI

  • Conflicting results pertaining to the role of the brain water channel AQP4 in K + ‐induced swelling have been presented.

    The Impact of Aquaporin‐4 Deletion on K + ‐Induced Astrocytic Swelling Depends on K + Concentration · 2025 · DOI

  • This K + ‐induced swelling is widely believed to be due to astrocytic K + uptake, even if the underlying mechanisms are not fully understood.

    The Impact of Aquaporin‐4 Deletion on K + ‐Induced Astrocytic Swelling Depends on K + Concentration · 2025 · DOI

  • Therefore, whether astrocytes in the intact MLC brain exhibit aberrant physiology related to water and ion homeostasis remains unknown.

    Impaired Volume Regulation and Electrophysiology of Astrocytes In Situ in a Mouse Model for Megalencephalic Leukoencephalopathy With Subcortical Cysts · 2025 · DOI

  • The transporter responsible for the release of citrate and its metabolites across the basolateral membrane remains unidentified. The molecular basis of the intestinal absorption system is poorly understood.

    SLC35G1 is a highly chloride-sensitive transporter responsible for the basolateral membrane transport in intestinal citrate absorption · 2024 · DOI

  • However, the H2O2 permeation mechanism through these channels remains poorly understood.

    Permeation mechanisms of hydrogen peroxide and water through Plasma Membrane Intrinsic Protein aquaporins · 2024 · DOI

  • However, the therapeutic effect of XBP on water retention in CHF remains unclear.

    Xinbao pill attenuated water retention by regulating the CaSR/AQP2 pathway in LAD-induced chronic heart failure rats · 2024 · DOI

  • The exact mechanisms of aquaporin regulation and function in the hepatobiliary system are not fully understood. The role of aquaporins in hepatobiliary disorders is not fully elucidated.

    Aquaporin membrane channels in the hepatobiliary tract: a model of complexity and clinical implications in health and disease · 2026 · DOI

  • Immune evasion in the TME is a challenge for cancer immunotherapy. The limited effectiveness of cancer immunotherapy for certain solid tumors is a challenge. Understanding the complex interconnections among NKA, ion channels, H+-ATPases, and immune responses is a challenge.

    Na+/K+-ATPase, cardiac glycosides, and tumor immunity · 2026 · DOI

  • The structural basis for aquaporin-8's dual functionality as both a water channel and ammonia transporter in mitochondria, and the molecular mechanisms by which ROS-induced mitochondrial dysfunction and aquaporin-8 knockdown are mechanistically linked in hepatotoxicity, require structural characterization and mechanistic studies beyond current knockdown approaches.

    Aquaporin membrane channels in the hepatobiliary tract: a model of complexity and clinical implications in health and disease · 2026 · DOI

  • Little is known about how KCCs contribute to cardiovascular diseases, - The expression and physiological significance of KCCs in the heart are still unclear, - More research is still…

    Exploring the Role of the SLC12A Cation-Coupled Chloride Cotransporters in the Cardiovascular System · 2026 · DOI

  • Investigating the regulatory mechanisms of SLC12A/CCC transporters to inform therapeutic interventions, - Studying the role of KCCs in cardiovascular…

    Exploring the Role of the SLC12A Cation-Coupled Chloride Cotransporters in the Cardiovascular System · 2026 · DOI

  • The diversity of fungal XIPs has been examined within the context of the fungal kingdom's exceptionally rich and complex evolutionary history, - The current literature has focused on the aquaporin and aquaglyceroporin subfamilies, - Substantial knowledge gaps persist regarding fungal AQPs, particularly those belonging to less common subfamilies such…

    Major Intrinsic Proteins in Fungi: A Special Emphasis on the XIP Subfamily · 2025 · DOI

  • Elucidating the roles of fungal AQPs, AQGPs, and XIPs in diverse fungal lifestyle strategies, - Investigating the involvement of fungal AQPs, AQGPs, and XIPs in the establishment and evolution of specialized interactions with surrounding…

    Major Intrinsic Proteins in Fungi: A Special Emphasis on the XIP Subfamily · 2025 · DOI

  • Investigating the relationship between hyperuricemia and NCC dysfunction in GS patients, - Examining the effects of thiazide diuretics on uric acid levels in GS patients, - Studying the association between hyperuricemia and clinical outcomes in GS…

    Clinical and genetic features of Gitelman syndrome patients with hyperuricemia · 2025 · DOI

  • The study used a limited number of mice (three to five), - The study used a specific age range of mice (4-6 weeks), - The study used a specific mouse line…

    Astrocyte aquaporin mediates a tonic water efflux maintaining brain homeostasis · 2024 · DOI

  • Investigating the role of astrocyte aquaporin in different brain regions, - Examining the effects of astrocyte aquaporin on brain function and plasticity, - Studying the relationship between astrocyte aquaporin and the glymphatic…

    Astrocyte aquaporin mediates a tonic water efflux maintaining brain homeostasis · 2024 · DOI

Most-cited papers in Ion Transport and Channel Regulation

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Open questions raised by papers listed on this page include: (1) The lack of robust analytical methods for SSI quantification in automated TEVC systems (“Analysis of sodium self-inhibition of the epithelial sodium channel (ENaC)…”, 2026); (2) The lack of a consensus on a common concept of the urinary concentrating mechanism (“Active salt transport and countercurrent exchange as the basis of urine…”, 2026); (3) The lack of a thermodynamic model of Malpighian tubule function (“Entropy generation in the Malpighian tubule and its comparison with the…”, 2026); (4) The underlying mechanism via chloride‐sensitive kinases remains unclear (“Hypotonicity‐Induced WNK1 Phosphorylation Prevents H 2 O 2 ‐Induced Apoptosis…”, 2026); (5) The exact mechanisms of aquaporin regulation and function in the hepatobiliary system are not fully understood (“Aquaporin membrane channels in the hepatobiliary tract: a model of complexity…”, 2026). 133 gap statements have been mined from Ion Transport and Channel Regulation papers in our 4.5M-paper local library, which holds 542 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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