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Open research questions in Receptor Mechanisms and Signaling

87 unresolved questions extracted from the limitations and future-work sections of 221 Receptor Mechanisms and Signaling papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Despite numerous available studies, many biophysical aspects that regulate G protein signaling, including membrane mobility, remain poorly understood.

    Heterotrimeric G proteins containing Gβ1γ2 subunits exhibit subtype-specific mobility differences in live cells · 2026 · DOI

  • However, the extent of underlying SUD causal variants, effector genes, and cellular contexts, remains unclear.

    Shared and unique chromatin accessibility and 3D functional interactions of substance use disorder loci implicate cell types beyond the brain · 2026 · DOI

  • However, the functional role of NK1S remains controversial; therefore, we investigated their functional interplay.

    The C‐terminal truncated splicing variant of NK1R negatively modulates substance P‐stimulated NK1R signaling · 2026 · DOI

  • However, the neural mechanisms mediating these effects and the role of endogenous central GLP-1 signaling in cocaine seeking remain unknown.

    An endogenous GLP-1 circuit engages VTA GABA neurons to regulate mesolimbic dopamine neurons and attenuate cocaine seeking · 2025 · DOI

  • Despite the abundant structures of GPCR–G protein complexes, little is known about the mechanism of G protein coupling specificity.

    Structure and dynamics determine G protein coupling specificity at a class A GPCR · 2025 · DOI

  • Our findings suggest that RYR1 should be further studied as a potential therapeutic target for reducing HF-related mortality.

    Genetic variation in RYR1 is associated with heart failure progression and mortality in a diverse patient population · 2025 · DOI

  • Despite its physiological significance, the mechanisms underlying H4R signalling and G protein preference across histamine receptors remain poorly understood.

    Structural insights into ligand recognition and G protein preferences across histamine receptors · 2025 · DOI

  • Despite great progress in other species, pharmacological properties of the bovine FFAR2 (bFFAR2) are not fully understood.

    Endogenous ligands of bovine FFAR2/GPR43 display distinct pharmacological properties · 2025 · DOI

  • Although its molecular mechanism remains elusive, big efforts are made to try to explain this mechanism using a wide range of methods.

    Ligand-Induced Biased Activation of GPCRs: Recent Advances and New Directions from In Silico Approaches · 2025 · DOI

  • The structural properties that govern the functional selectivity and the conformational dynamics of ACKR3 activation are poorly understood.

    Conformational dynamics underlying atypical chemokine receptor 3 activation · 2024 · DOI

  • However, the conformational basis of selective coupling of primary G‐protein remains elusive.

    Molecular Determinant Underlying Selective Coupling of Primary G‐Protein by Class A GPCRs · 2024 · DOI

  • Both βarr and Gβγ contribute to such non-canonical endosomal G protein signaling, but their specific roles and contributions remain poorly understood.

    Role of the V2R–βarrestin–Gβγ complex in promoting G protein translocation to endosomes · 2024 · DOI

  • Based on structural homology, GPR180 is a new member of this protein family, but little is known about the cellular role of GPR180.

    GPR180 is a new member of the Golgi-dynamics domain seven-transmembrane helix protein family · 2024 · DOI

  • Despite their biological significance, GPCRs have not been widely studied in the field of toxicology.

    Beyond the Nucleus: Plastic Chemicals Activate G Protein-Coupled Receptors · 2024 · DOI

  • However, studies regarding the functional selectivity of Receptor Tyrosine Kinases (RTKs) remain sparse.

    Functional selectivity of Receptor Tyrosine Kinases regulates distinct cellular outputs · 2024 · DOI

  • Much remains to be known about the integration of different signals affecting RTK signalling specificity to orchestrate long-term cellular outcomes.

    Functional selectivity of Receptor Tyrosine Kinases regulates distinct cellular outputs · 2024 · DOI

  • Although α2-adrenergic receptors are known to modulate the immune response in different ways, the therapeutic exploration of their utility has been limited by the lack of agonists selective for the three α2-adrenergic subtypes.

    Sustained Alleviation of Autoimmunity by Activating α2B-adrenergic Receptors · 2024 · 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

  • 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

  • The transient nature of calcium signals necessitates real-time monitoring with specialized equipment. Current assays have limitations for high-throughput applications.

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

  • 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

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87 open questions have been extracted from the limitations and future-work passages of 221 Receptor Mechanisms and Signaling papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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