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Open research questions in Receptor Mechanisms and Signaling

297 gap statements mined from Receptor Mechanisms and Signaling papers in our 7.9M-paper local library, which holds 1,369 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

  • Current evidence supports immune-cell b2-AR as an important component of neuroimmune regulation during myocardial injury, but several fundamental questions remain unresolved.

    Immune cell β2-adrenergic receptor signaling in myocardial injury: from neuroimmune crosstalk to precision immunomodulation · 2026 · DOI

  • Currently, there is a wealth of structural data describing the active G protein-coupled state of class B1 GPCRs, and more limited information on inactive or intermediate states.

    Dynamics of the PAC1 receptor in apo, peptide agonist-bound, and G protein complexed states · 2026 · DOI

  • Application across multiple GPCRs provides access to previously underexplored functional GPCR dynamics, receptor states, and sites, including microswitches and hidden ligand entrance gateways.

    Integrative biophysical illumination of the 3D GPCRome dynamics · 2026 · DOI

  • The model provides a basis for evaluating multiple-ascending-dose scenarios and formulation development, although prospective predictive performance remains to be established.

    PBPK Modeling Investigation of IVIVE–Observed Pharmacokinetic Divergence for VU0467319: A Mechanistic Refinement Workflow for Low-Solubility Compounds · 2026 · DOI

  • The contributions of Gα regions other than the C-terminal α5 helix have remained unclear. The mechanism of Gα activation is not fully understood.

    Rotation of the N-terminal helix triggers Gα activation · 2026 · DOI

  • However, the exact mechanism by which smoking contributes to RP or α 2C -AR remains unclear.

    Cigarette smoke extract induces p38-mediated expression and ROS/rho-mediated translocation of alpha 2C adrenoceptor in human microvascular smooth muscle cells · 2025 · DOI

  • However, due to technical difficulties in recording the dopamine neurons of specific projections, little is known about the signals conveyed by mPFC projections, including the basic question of whether individual projections signal reward or aversive information.

    Functional diversity of dopamine axons in prefrontal cortex during classical conditioning · 2024 · DOI

  • The limitation of this study is the use of a chimeric, engineered miniGsq protein for both structural and functional assays.

    Structural insights into the ligand modulation of MRGPRX4 conformational plasticity · 2026 · DOI

  • In a screen of disease-linked mutations in Go, we identified a subset that had no obvious biochemical defects, warranting further investigation.

    Disrupted RGS coupling underlies a clinically distinct subset of GNAO1-related disorder · 2026 · DOI

  • Although extensively studied in soluble proteins, little is known about how pleiotropic effects shaped the evolution of receptor protein functions.

    Deep mutational scanning of the GPCR rhodopsin reveals pleiotropic mutational effects and their roles in modulating receptor signaling · 2026 · DOI

  • Although endogenous agonists have not been characterized, GPR50 may have its own signaling activity, which is undefined at present.

    Structure of the melatonin–related orphan receptor, GPR50 · 2026 · DOI

  • G protein-coupled receptors (GPCRs) represent one of the most important target classes in drug discovery, yet many remain pharmacologically underexplored due to limited biological knowledge and technical challenges associated with their characterisation.

    Thermodynamic profiling and fragment screening of GPCRs using grating-coupled interferometry · 2026 · DOI

  • Intracellular allosteric ligands can impose such bias, yet how subtle chemical changes within these pockets reshape receptor-transducer coupling and downstream signaling remains unclear.

    Fine-tuning an intracellular allosteric pocket programs GPCR signaling bias · 2026 · DOI

  • Biophysical pleiotropy, the phenomenon in which a mutation affects multiple protein properties, underlies many genetic diseases and shapes protein evolution, yet remains poorly understood, limiting synthetic biology and therapeutic development.

    Deep mutational scanning of the GPCR rhodopsin reveals pleiotropic mutational effects and their roles in modulating receptor signaling · 2026 · DOI

  • No PAM-bound A3 AR structure is available to date. The lack of experimental A3 AR structure at the time of the study required the use of modeling calculations.

    From empirical screening to lipid trolling: the evolution of extrahelical allosteric modulators of A1 and A3 adenosine receptors · 2026 · DOI

  • The lack of understanding of the binding sites of A1 and A3 AR PAMs. The limited development of synthetic optimization methods to modify the N4 and C2 positions on the scaffold.

    From empirical screening to lipid trolling: the evolution of extrahelical allosteric modulators of A1 and A3 adenosine receptors · 2026 · DOI

  • A specific difference in CHRM3 expression level was found in LPFC ExNs between young and aged monkeys, but larger sample sizes are needed to fully assess age-related effects on expression profiles.

    Transcriptional and functional profiles of muscarinic receptor-expressing neurons in primate lateral prefrontal and anterior cingulate cortices · 2026 · DOI

  • Current assays have limitations for high-throughput applications.

    A luminescent calcium biosensor enabling endpoint measurement of GPCR-mediated calcium signaling · 2026 · DOI

  • Inter-study differences limit the development of pharmacological therapies. Experimental cell systems are limited by their inability to capture crosstalk between cell types from different organs.

    An Integrated Analysis of GLP-1R Agonist Mechanisms: Addressing Study Variations in Heterogeneous Cell Systems · 2026 · DOI

  • The development of pharmacological therapies such as GLP-1RAs is limited by study variability. Experimental cell systems can be used to study metabolic regulation and drug responses, but are limited by inter-study differences.

    An Integrated Analysis of GLP-1R Agonist Mechanisms: Addressing Study Variations in Heterogeneous Cell Systems · 2026 · DOI

  • Bioluminescence resonance energy transfer (BRET)-based ligand binding assays have emerged as a powerful platform for quantifying binding in living cells, but their application to D2R has been limited by the availability of suitable fluorescent tracers.

    BRET-Based Ligand Binding at Recombinant and Endogenous Dopamine D2 Receptors · 2026 · DOI

  • Does elevated [18F]FP-TZTP VT predict future cognitive decline? Can muscarinic PET be simplified for routine use?

    Muscarinic Receptor PET in Neurodegeneration: Promise, Pitfalls, and Translational Priorities · 2026 · DOI

  • The previously determined structures of βarr in complex with Rp-tails were limited to the inactive and active states of βarr.

    An arginine switch drives the stepwise activation of β-arrestin by CXCR7 · 2025 · DOI

  • The A24 ACC tissue block contains cells from two distinct cytoarchitectonic subareas (24b and 24c) which cannot be distinguished in the snRNAseq dataset.

    Transcriptional and functional profiles of muscarinic receptor-expressing neurons in primate lateral prefrontal and anterior cingulate cortices · 2026 · DOI

  • No comparison with other luminescent calcium biosensors or detailed validation against established gold-standard methods beyond FLIPR is presented in the available excerpt.

    A luminescent calcium biosensor enabling endpoint measurement of GPCR-mediated calcium signaling · 2026 · DOI

Most-cited papers in Receptor Mechanisms and Signaling

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Open questions raised by papers listed on this page include: (1) Current evidence supports immune-cell b2-AR as an important component of neuroimmune regulation during myocardial injury, but several fundamental questions remain unresolved (“Immune cell β2-adrenergic receptor signaling in myocardial injury: from…”, 2026); (2) The model provides a basis for evaluating multiple-ascending-dose scenarios and formulation development, although prospective predictive performance remains to be established (“PBPK Modeling Investigation of IVIVE–Observed Pharmacokinetic Divergence for…”, 2026); (3) Although extensively studied in soluble proteins, little is known about how pleiotropic effects shaped the evolution of receptor protein functions (“Deep mutational scanning of the GPCR rhodopsin reveals pleiotropic mutational…”, 2026); (4) Although endogenous agonists have not been characterized, GPR50 may have its own signaling activity, which is undefined at present (“Structure of the melatonin–related orphan receptor, GPR50”, 2026); (5) Intracellular allosteric ligands can impose such bias, yet how subtle chemical changes within these pockets reshape receptor-transducer coupling and downstream signaling remains unclear (“Fine-tuning an intracellular allosteric pocket programs GPCR signaling bias”, 2026). 297 gap statements have been mined from Receptor Mechanisms and Signaling papers in our 7.9M-paper local library, which holds 1,369 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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