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Open research questions in Receptor Mechanisms and Signaling

30 unresolved questions extracted from the limitations and future-work sections of 151 Receptor Mechanisms and Signaling papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • loss by maintaining muscle mass and mitochondrial function while sup- porting overall metabolic processing, targeting one of the major limitations of GLP-1 therapies.

    Alternatives to GLP-1 Peptides · 2026 · DOI

  • Although previous studies have partially addressed the G protein coupling selectivity of D3R, they produced inconsistent findings across different assay platforms, likely because of using modified systems that did not employ wild-type G proteins26,27,30,33.

    Gαo/z-biased coupling profile of the dopamine D3 receptor · 2026 · DOI

  • Recent studies suggest an integrated role of G proteins and β-arrestins in GPCR signaling, however the cellular and biochemical requirements for G protein:β-arrestin interactions remain unclear.

    β-arrestin recruitment facilitates a direct association with G proteins · 2026 · DOI

  • Our cohort represents an unselective AMI population, including patients with a wide range of disease severi- ties, ages, and comorbidities. Based on the number of patients included, any major influence of ADRB1 variants in the overall post-AMI population on metoprolol treat- ment appears unlikely. However, findings in subgroups are likely constrained by limited sample size and a low number of events and should be interpreted cautiously. Our study cannot inform on β-blocker treatment effectiveness, as we only included patients who were on treatment and excluded those who were discharged without β-blockers. Moreover, as this was an observational study, the presence of unmea- sured confounding cannot be excluded. As metoprolol treatment status was determined upon hospital discharge, any changes in treatment continuation or metoprolol dose throughout the observation period could not be taken into consideration. We did not have information on blood pressure, heart rate, or treatment tolerance during follow-up that might have impacted treatment continuation. However, we have previously demonstrated that persistence with β-blocker treatment following AMI in Norway is high, and that the prescribed dose remains largely unchanged after discharge [31]. In addition, the use of CYP2D6 metabolizer subgroup as a proxy for metoprolol exposure is imprecise as there is considerable interindividual variation within each subgroup. Also, drug exposure may be affected by concomi- tant use of CYP2D6-inhibiting drugs [14]. Even if the use of CYP2D6 inhibitors were negligible at baseline, we could not account for changes in concomitant drug treatment dur- ing follow-up. LVEF was not available for more than half of the cohort, limiting further analyses stratified by EF. Another limitation is that we only included ADRB1 vari- ants, and not polymorphisms in other adrenergic receptors or regulators which combined might have been more infor- mative [14]. Given the statistical model used, our findings may have been influenced by the duration of follow-up. Fur- thermore, the optimal duration of β-blocker treatment after AMI remains unknown, and as pathophysiological responses following an AMI may alter adrenergic signaling over time, the influence of ADRB1 variants may also vary accordingly. 1 3European Journal of Clinical Pharmacology (2026) 82:169 Despite these limitations, our study identified potential subgroups that may derive greater benefit from metoprolol treatment and could generate hypotheses for future studies on individualized treatment post-AMI.

    Prognostic relevance of β1-adrenergic receptor polymorphisms on cardiovascular outcome in patients treated with metoprolol after acute myocardial infarction - an observational study · 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

  • The excerpt does not explicitly discuss limitations of the CalLuc-based calcium biosensor approach or identify specific scenarios where it may underperform compared to alternative methods.

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

  • Understanding ligand-protein interactions is essential for advancing drug discovery, protein design, and structural biology. Therefore, modeling ligand-protein interactions is a cornerstone of modern drug discovery and molecular biology, enabling the rational design of therapeutics and a deeper under- standing of biological processes [59]. Current commercial tools, such as AlphaFold3, have established a high standard for predicting the 3D structures of biomolecular complexes [6, 60]. However, their ac- cessibility and high costs limit broader adoption. The recently introduced fully open-source model, such as Boltz-1, addresses this issue and competes with these state-of-the-art tools in both accuracy and usability. We found that Boltz-1 demonstrated strong performance in reproducing protein folding, deriving its capabilities from the parent source code of AlphaFold 3. Boltz-1 effectively reproduces the 3D structures of biomolecular complexes, demonstrating excellent performance, particularly in docking ligands with flexible macrocycles. It successfully re-docked a diverse set of ligands with varying com- plexities, achieving binding scores comparable to commercial tools such as Glide by Schrodinger. In terms of RMSD ligand-binding ranking, Botlz-1 outperformed the popular docking tool AutoDock Vina for all ligands studied. Finally, while capturing the binding modes of low-molecular-weight or - ganics, predicting complex peptidomimetics remains beyond the current capabilities of Boltz-1. To summarize, our benchmarking indicates that Botlz-1 presents opportunities to improve computational 66 M. V. Prud, A. Kyrychenko screening of small molecular libraries and may play a significant role in the future of AI-driven pre- dicting of ligand-protein interactions. Finally, when our manuscript was ready for submission, Boltz’s developing team announced the revolutionizing update for Boltz-2 (https://github.com/jwohlwend/boltz), introducing controllability features including experimental method conditioning, distance constraints, and multi-chain template integration for structure prediction, and the AI model to approach the performance of free-energy per- turbation (FEP) methods in estimating small molecule–protein binding affinity. A.V.K. acknowledges the grant № 87/0062 (2021.01/0062) “Molecular design, synthesis and screening of new potential antiviral pharmaceutical ingredients for the treatment of infec- tious diseases COVID-19” from the National Research Foundation of Ukraine.

    AlphaFold3 versus experimental structures: assessment of the accuracy in ligand-bound G protein-coupled receptors · 2024 · DOI

  • OBJECTIVES: Melatonin initiates physiologic and therapeutic responses in various tissues through binding to poorly defined MT receptors regulated by G-proteins and purine nucleotides.

    Dampening of neurotransmitter action: molecular similarity within the melatonin structure · 2018 · DOI

  • Our approach thus facilitates direct comparisons between receptors and opens up the possibility of structural and dynamical studies of many orphan and understudied GPCRs.

    Who's driving? Common evolutionary mechanism of activation of class A GPCRs · 2026 · DOI

  • However, PAR1’s transducer-wide coupling profile, transcriptional consequences, and physiological outputs remain incompletely characterized.

    Protease-activated receptor 1 as an endogenous model of peptidergic Gαq-Gα12-biased G protein signaling · 2026 · DOI

  • We conclude that the effective chemical bandwidth of cellular neuromodulation by GPCRs is not limited by the number of available transducers, and that there exists additional temporal coding which enables individual neurons to distinguish a richer neuromodulatory input.

    Temporal coding expands the bandwidth of GPCR-mediated neuromodulation · 2026 · DOI

  • No discussion is provided on how the framework handles parameter identifiability issues when multiple conditions alter the same model parameter, despite mentioning this as a concern.

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

  • The paper lacks discussion on how to handle cases where subject-specific data lack standard deviation measurements, beyond stating that residuals were considered in qualitative assessment.

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

  • The choice of exponential exponent (exp_i = 2 or 1) for penalizing parameter adjustments is set empirically without systematic justification for why these specific values optimally balance data fit and biological interpretability.

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

  • The manual assignment of penalty weights (PW_i) to balance parameter variability between different cell systems (1.5 for EndoC-βH5 versus human islets, 1 for media conditions) requires empirical tuning and lacks a systematic, data-driven approach.

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

  • The assumption that experimental noise is additive, independent, and normally distributed may not hold in practice for all experimental conditions, which could affect model validation.

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

  • Future work directions are not explicitly stated in the provided excerpt, leaving open questions about planned extensions or improvements to the biosensor technology.

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

  • No discussion is provided regarding the applicability of this endpoint luminescent assay to kinetic measurements of calcium signaling or real-time monitoring applications.

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

  • The snRNAseq dataset includes only male monkeys that vary in age, and studies with larger sample size are underway to assess the effect of sex and age on expression profiles.

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

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30 open questions have been extracted from the limitations and future-work passages of 151 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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