.webp&w=384&q=75){kind=logo}
Loading, please wait...
Loading, please wait...
Understanding the cough reflex encoding mechanism is crucial for managing chronic respiratory conditions. Recent research identifies nitric oxide synthase (NOS) activation in the nucleus tractus solitarii (nTS) as a key factor. Specifically, vagal afferent nerves in the airway mucosa regulate cough through NMDA receptor signaling. While many vagal pathways use other receptors, the cough reflex specifically requires NMDA activation.
The study hypothesized that NOS activation and a cGMP cascade serve as downstream messengers in the nTS. Researchers used NADPH-diaphorase staining to find NOS-expressing neurons in the brain stem. Although rare, these neurons exist in the medial solitary tract nucleus (SolM). Furthermore, microinjecting NOS inhibitors into the SolM significantly reduced coughing induced by citric acid. However, the data showed that this process does not utilize soluble guanylate cyclase or cGMP pathways.
Consequently, nitric oxide (NO) acts as a direct downstream regulator of NMDA-mediated cough encoding. No changes in basal breathing occurred during these interventions. Similarly, NMDA injections into the SolM induced respiratory responses, including cough, which were partially NOS-dependent. Therefore, this unique pathway distinguishes cough from other vagal sensory transmissions. These findings might lead to more effective antitussive therapies by targeting central nitric oxide signaling.
Nitric oxide serves as a vital downstream regulator in the nucleus tractus solitarii. It helps encode the cough reflex triggered by NMDA receptor activation.
No, research indicates that the nitric oxide-dependent encoding of cough in the brain stem does not act through soluble guanylate cyclase or cGMP.
Disclaimer: This content is for informational and educational purposes only... Refer to the latest local and national guidelines for clinical practice.
References
Farmer DGS et al. Nitric oxide synthase activation in nTS is essential to NMDA receptor dependent encoding of the cough reflex. Am J Physiol Regul Integr Comp Physiol. 2026 Feb 18. doi: 10.1152/ajpregu.00290.2025. PMID: 41706506.
Read summarized clinical updates, watch expert medical content, and earn CME certifications right from your smartphone.
Open your smartphone camera to scan and install.
A new study reveals that nitric oxide synthase activation in the solitary tract nucleus is essential for NMDA receptor-mediated cough reflex encoding....
6 months ago
Explore the emerging role of Brixadi, an extended-release buprenorphine injection, for managing stimulant use disorder through kappa opioid receptor antagonism and steady plasma levels.
Today
A premature neonate developed upper limb compartment syndrome after uterine rupture extruded the arm through a scar defect. Conservative management with continuous monitoring yielded complete functional recovery and normal limb growth at 10-year follow-up, highlighting non-operative safety in selected cases.
Today
Dendritic cells bridge innate and adaptive immunity in myocardial infarction. This review explores their pathological roles, circulating dynamics, novel tolerogenic interventions, and how standard cardiovascular medications modulate dendritic cells to improve post-infarction myocardial repair and patient outcomes.
Today
Endoscopic posterior cervical fusion combines minimally invasive decompression, joint preparation, and rigid screw-rod fixation for atlantoaxial pathologies. Early clinical findings demonstrate solid bony union, excellent symptom relief, and minimal soft-tissue morbidity without significant vascular compromise.
Yesterday
Atherosclerosis involves extensive glycometabolic reprogramming across immune and vascular cells. This review examines how glycolysis, the pentose phosphate pathway, and lactate-driven epigenetic shifts fuel plaque vulnerability, while highlighting novel therapeutic targets like PFKFB3 and LDHA.
Today
