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Open research questions in Neuroscience of respiration and sleep

129 gap statements mined from Neuroscience of respiration and sleep papers in our 4.5M-paper local library, which holds 590 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

  • The mechanisms of pH sensing in cerebrospinal fluid-contacting neurons are not well understood. The role of PKD2L1 channels in the sensory function of cerebrospinal fluid-contacting neurons is unclear. The spatial localization of functional PKD2L1 channels in cerebrospinal fluid-contacting neurons is unknown.

    PKD2L1 channels segregated to the apical compartment are the dual-mode pH sensor in cerebrospinal fluid-contacting neurons · 2026 · DOI

  • The specific effects of CRH on the unique nTS neuron phenotypes remain unclear. The mechanisms by which CRH influences cardiorespiratory function in the nTS are not well understood.

    Corticotropin-Releasing Hormone differentially modulates GABA and non-GABA nucleus Tractus Solitarii neurons · 2026 · DOI

  • This structure is a critical hub for the regulation of survival behaviors but is relatively understudied compared to other hypothalamic structures.

    The anterior hypothalamic area: a hub for convergence of innate and learned threat responding · 2026 · DOI

  • Despite its prevalence, the in vivo effects of furanylfentanyl are not well characterized, especially regarding respiratory depression.

    Fentanyl decreases arterial blood oxygen saturation more than furanylfentanyl in mice due to increased apnea · 2026 · DOI

  • This CRC aims to address the lack of standardisation in diagnosis and management, in a context where SDB in infants – whether obstructive or central – remains under-recognised despite representing a significant health burden.

    Redefining sleep disordered breathing care in children aged under 2 years: insights from the ERS iDREAM Clinical Research Collaboration · 2026 · DOI

  • Future studies are warranted to fully elucidate the combined effects of HF and old age on diaphragm hemodynamics.

    Effects of heart failure on the diaphragm hyperemic response in old rats · 2026 · DOI

  • While advances in ventilatory support have improved survival, risk factors for mortality remain incompletely understood.

    Survival in congenital central hypoventilation syndrome (CCHS): data from the European CCHS Consortium · 2026 · DOI

  • However, ETO‘s mechanisms and sites of action remain unknown, and the experimental use of synthetic progestins has been met with mixed respiratory outcomes.

    Sex Differences in the Effects of Etonogestrel on Respiratory Recovery in an In Vivo Rat Model of Central Chemoreflex Impairment · 2026 · DOI

  • The degree to which RTN is impaired by Phox2b mutations (percent neuronal loss, degree of cellular dysfunction) depends on the type of mutation and is not clearly established in CCHS nor even in animal models.

    Restoration of the Central Chemoreflex by a Progesterone Receptor Agonist After Lesions of the Retrotrapezoid Nucleus · 2026 · DOI

  • In contrast, the response of the PND to metabolic acidosis in neonate brain preparations in vitro is limited to a modest frequency change that is attributed to effects of acid in multiple brain regions including the respiratory rhythm pattern generator.

    Restoration of the Central Chemoreflex by a Progesterone Receptor Agonist After Lesions of the Retrotrapezoid Nucleus · 2026 · DOI

  • However, the molecular substrates underlying the stress-induced reduction in ATP release remain poorly understood, and the basis for the comorbidity of depression and anxiety disorders is still unknown.

    Astrocytic connexin43 in the medial prefrontal cortex regulates depressive- and anxiety-like behaviors via ATP release · 2025 · DOI

  • Dysbiosis of gut microbiota is closely associated with the development of hypertension, yet the underlying mechanism remains unclear.

    Microbiota-derived acetate suppresses sympathetic outflow via olfactory receptor 59 in the rostral ventrolateral medulla · 2025 · DOI

  • Although pLTF exhibits a powerful diurnal rhythm, effects of aging and APOE genotype on mAIH-induced pLTF have not been studied across the daily rest/active cycle.

    Aging Impairs Respiratory Motor Plasticity in Rest Phase APOE4 Knock-In Rats · 2025 · DOI

  • Anomalies in respiratory control during sleep contribute to airway obstructions and recurrent desaturations; however, the origins of the problem are not well known.

    Stress-induce reduction of hypoglossal motoneuron excitability in male rats: a novel mechanism in the pathophysiology of obstructive sleep apnea (OSA) · 2025 · DOI

  • While the basal ganglia are known to play roles in both sleep and respiratory regulation, their interaction with respiration rhythms remains poorly understood.

    Dynamic Respiration–Neural Coupling in Substantia Nigra across Sleep and Anesthesia · 2025 · DOI

  • Therefore, hypoxia and hypercapnia are expected to affect the expression of Fos, a marker of cellular activation, in the RPa; however, there is currently no consensus on Fos expression in the RPa under hypoxic and hypercapnic conditions.

    Increased Fos immunoreactivity in astrocytes in the raphe pallidus under hypoxia, not hypercapnia · 2025 · DOI

  • While the effect(s) of opioids on central rhythm-generating circuits are well documented, the mechanisms leading to airway obstruction remain poorly understood.

    Fentanyl Disrupts Vagal Control of Airway Tone to Induce Transient Obstruction · 2025 · DOI

  • Although hypocapnia may amplify hyperoxia-induced reductions in CBF and CDo 2, its effects on brain oxygen extraction (OEF) and metabolism ([Formula: see text]) remain unclear.

    Modulation of the human brain oxygen extraction fraction and metabolic rate in response to hyperoxia: the role of hypocapnia · 2025 · DOI

  • VRC neurons express galanin receptor 1, suggesting potential regulatory action by galanin, however, the precise galaninergic chemoreceptor-VRC circuitry remains to be determined.

    Galaninergic and hypercapnia-activated neuronal projections to the ventral respiratory column · 2024 · DOI

  • The extensive tongue muscle weakness in patients with MNDs suggests a potential role for therapeutic exercise, but suffcient evidence is lacking to conclude if tongue exercise is beneficial or harmful.

    Tongue exercise-induced plasticity in upper airway EMG activity in a model of hypoglossal motor neuron loss · 2024 · DOI

  • While there are significant changes, it remains to be determined what the underlying mechanisms are and how they may play a contributory role in pathophysiologies co-morbid with gut microbiome dysregulation.

    Gut microbiome is dispensable for normal respiratory function and respiratory chemoreflex · 2024 · DOI

  • Chronic hypoxia (CH) from birth blunts the hypoxic ventilatory response (HVR) in newborn rats, but there is conflicting evidence as to whether (or how quickly) the HVR recovers after these rats are returned to room air.

    Recovery of Ventilatory and Metabolic Responses to Hypoxia after Chronic Hypoxia in Neonatal Rats · 2024 · DOI

  • Neonatal inflammation is common, yet our understanding of the mechanisms underlying impairment is poorly understood.

    Neonatal inflammation induces lasting sex- and region-dependent microglia activation and sex-dependent impairments in chemoreflexes · 2026 · DOI

  • The CO2 convection requirement response to hypoxia did not differ between treatment groups during the late phase of the HVR at any age, but metabolism and CO2 convection requirement could not be determined during the early phase of the HVR due to non-steady state conditions.

    Recovery of Ventilatory and Metabolic Responses to Hypoxia after Chronic Hypoxia in Neonatal Rats · 2024 · DOI

  • Hypnotherapy describes the application of this technique to medical problems as diverse as anxiety disorders, irritable bowel syndrome and chronic pain control – with mixed results.

    Taking your mind off breathlessness · 2024 · DOI

Most-cited papers in Neuroscience of respiration and sleep

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Open questions raised by papers listed on this page include: (1) The mechanisms of pH sensing in cerebrospinal fluid-contacting neurons are not well understood (“PKD2L1 channels segregated to the apical compartment are the dual-mode pH…”, 2026); (2) The specific effects of CRH on the unique nTS neuron phenotypes remain unclear (“Corticotropin-Releasing Hormone differentially modulates GABA and non-GABA…”, 2026); (3) Despite its prevalence, the in vivo effects of furanylfentanyl are not well characterized, especially regarding respiratory depression (“Fentanyl decreases arterial blood oxygen saturation more than furanylfentanyl…”, 2026); (4) This CRC aims to address the lack of standardisation in diagnosis and management, in a context where SDB in infants – whether obstructive or central – remains under-recognised despite representing a significant health burden (“Redefining sleep disordered breathing care in children aged under 2 years:…”, 2026); (5) Future studies are warranted to fully elucidate the combined effects of HF and old age on diaphragm hemodynamics (“Effects of heart failure on the diaphragm hyperemic response in old rats”, 2026). 129 gap statements have been mined from Neuroscience of respiration and sleep papers in our 4.5M-paper local library, which holds 590 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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