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Nitrous oxide, commonly known as laughing gas, is a sedative administered by healthcare providers to help patients relax during procedures. It is a colourless, faintly sweet-smelling gas that is inhaled through a nosepiece or mask. Nitrous oxide is also used recreationally, however, this can lead to serious and potentially life-threatening health complications. In the context of medicine, nitrous oxide is often used during labour and delivery to help women manage pain. While the precise mechanism is not fully understood, research suggests that nitrous oxide causes muscle relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations, which results in vasodilation and the relaxation of smooth muscle cells lining blood vessels.
| Characteristics | Values |
|---|---|
| Type | Nitrous oxide (N2O), commonly known as laughing gas |
| Administration | Inhaled through a mask or nosepiece |
| Muscle Relaxation Mechanism | Not well understood, but studies indicate it decreases the frequency of agonist-induced Ca2+ oscillations, resulting in airway smooth muscle cell relaxation |
| Muscle Relaxation Impact | Minimal impairment of muscle function, with a decrease in peak torque and maximal angular velocity |
| Muscle Type | Human skeletal muscle, specifically the quadriceps femoris muscle |
| Dosage | 35% N2O |
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What You'll Learn
- Nitrous oxide is a sedative that helps patients relax during procedures
- Nitric oxide induces airway smooth muscle cell relaxation
- Nitrous oxide decreases peak torque at any angular velocity
- Nitric oxide induces muscular relaxation via GMP-dependent and -independent mechanisms
- Nitric oxide induces vascular smooth muscle relaxation by decreasing Ca2+ oscillations
Nitrous oxide is a sedative that helps patients relax during procedures
Nitrous oxide, commonly known as laughing gas, is a sedative that helps patients relax during procedures. It is a colourless, faintly sweet-smelling gas that patients breathe in through a mask or nosepiece. Nitrous oxide has been used by physicians and dentists since the mid-19th century and remains one of the most common inhaled sedatives used today. It is often used during labour and delivery, offering a good option for women who want controllable pain relief.
Nitrous oxide is also used in conjunction with parturition, which requires repeated high-force voluntary muscle actions. A study on the effects of nitrous oxide on the quadriceps femoris muscle found that it decreased peak torque at any given angular velocity. However, the impairment in muscle function induced by a 35% concentration of nitrous oxide is minimal and likely insignificant in clinical practice.
Nitric oxide (NO) is a neurotransmitter that induces muscular relaxation in the body. It is produced by epithelial ciliated cells, type II alveolar cells, and neural fibres that innervate airway smooth muscle cells. NO induces airway smooth muscle cell relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations. This relaxation is enhanced by selective inhibitors of cGMP-specific phosphodiesterase-5 but blocked by inhibitors of soluble guanylyl cyclase and protein kinase G.
In addition to its effects on airway smooth muscle cells, NO also plays a role in vasodilation. It initiates a cascade of biological events that relax the smooth muscle cells lining blood vessels, resulting in the dilation of the vessels. This process involves the diffusion of NO into smooth muscle cells, where it binds to and activates the enzyme guanylate cyclase (GC). Once all the GC enzymes are activated, additional NO is stored as a nitrosothiol for future use. The relaxation of smooth muscle cells and vasodilation continue until a phosphatase enzyme dissociates the phosphate from myosin.
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Nitric oxide induces airway smooth muscle cell relaxation
Nitric oxide (NO) is a molecule and chemical compound with the chemical formula NO. It is a powerful vasodilator with a half-life of a few seconds in the blood. In mammals, including humans, NO is a signalling molecule involved in several physiological and pathological processes.
NO is an important regulator and mediator of processes in the nervous, immune, and cardiovascular systems. It is a mediator of vasodilation in blood vessels and is produced by many cells in the body, including epithelial ciliated cells, type II alveolar cells, and neural fibres that innervate airway smooth muscle cells.
NO induces airway smooth muscle cell relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations. This is done via a cGMP-dependent mechanism, which activates cGMP-dependent protein kinase (PKG). The cGMP analogues and selective PKG activators 8Br-cGMP and 8pCPT-cGMP also induced airway relaxation and decreased the frequency of Ca2+ oscillations.
In addition, NO relaxes vascular smooth muscle by binding to the heme moiety of cytosolic guanylate cyclase, activating guanylate cyclase, and increasing intracellular levels of cyclic-guanosine 3',5'-monophosphate (cGMP). This elevation of intracellular cGMP results in relaxation by the activation of cGMP-dependent protein kinase, which phosphorylates target proteins.
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Nitrous oxide decreases peak torque at any angular velocity
Nitrous oxide, commonly known as laughing gas, is a colourless, slightly sweet-smelling gas that is administered through a mask or nosepiece. It is a sedative commonly used by healthcare providers to help patients relax during procedures. Nitrous oxide is also used during labour and delivery, where it helps women manage pain during contractions.
Nitrous oxide has been found to decrease peak torque at any angular velocity. In a study, nine healthy subjects performed maximal voluntary muscle actions once while breathing air and once while breathing a gas mixture containing 35% nitrous oxide. The peak torque of the knee extensors was measured during concentric muscle contractions at different angular velocities (30, 60, 90, 150 and 210 degrees s-1), and the results showed that nitrous oxide decreased peak torque at any given angular velocity. The overall decrease in peak torque averaged 4.8 +/- 2.2%, and the decrease in maximal angular velocity was 5.7 +/- 4.3%.
The study also examined the electrically evoked eccentric and concentric torque-velocity relationships in human knee extensor muscles. It was found that nitrous oxide consistently attenuates thermogenic and thermoperceptual responses to repetitive cold stress in humans. The impairment in muscle function induced by 35% nitrous oxide is considered minute and likely insignificant in clinical practice.
While nitrous oxide is generally safe when used properly, recreational use or overuse can lead to serious and potentially life-threatening health complications, including nerve damage and weakened immune systems.
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Nitric oxide induces muscular relaxation via GMP-dependent and -independent mechanisms
Nitric oxide (NO) induces airway smooth muscle cell (SMC) relaxation, but the underlying mechanism is not well understood. NO is produced from the amino acid L-arginine by the enzymatic action of nitric oxide synthase (NOS). There are two endothelial forms of NOS: constitutive NOS (cNOS, type III NOS) and inducible NOS (iNOS, type II NOS). Under normal, basal conditions in blood vessels, NO is continually being produced by cNOS. The activity of cNOS is calcium- and calmodulin-dependent.
NO induces airway SMC relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations. The cyclic release from and reuptake of Ca2+ into the SR results in Ca2+ oscillations. Ca2+ activates, via calmodulin, myosin light chain (MLC) kinase (MLCK) to phosphorylate myosin (MLC-P) and initiate SMC contraction. The simultaneous inactivation of MLC phosphatase (MLCP) by agonists, i.e., via Rho kinase (ROK), enhances MLC phosphorylation and SMC contraction. The relative activities of MLCK and MLCP determine the contractile state of the SMC.
NO induces airway relaxation by the activation of sGC to synthesize cGMP from GTP. ODQ specifically inhibits sGC activity. The elevation of cGMP activates PKG, which inhibits the IP3R, resulting in a lowering of the frequency of Ca2+ oscillations, deactivation of MLCK, and airway relaxation. The cGMP analogue Rp-8-pCPT-cGMPS specifically inhibits PKG activity. In addition, cGMP activates PDE-5 to convert cGMP to inactive GMP.
The cGMP analogues and selective PKG activators 8Br-cGMP and 8pCPT-cGMP also induced airway relaxation and decreased the frequency of the Ca2+ oscillations. NOC-5 inhibited the increase of [Ca2+]i and contraction induced by the photolytic release of inositol 1,4,5-trisphosphate (IP3) in airway SMCs. The effect of NO on the Ca2+ sensitivity of the airway SMCs was examined in lung slices permeabilized to Ca2+ by treatment with caffeine and ryanodine. Neither NOC-5 nor 8pCPT-cGMP induced relaxation in agonist-contracted Ca2+-permeabilized airways. Consequently, it was concluded that NO, acting via the cGMP–PKG pathway, induced airway SMC relaxation by predominantly inhibiting the release of Ca2+ via the IP3 receptor to decrease the frequency of agonist-induced Ca2+ oscillations.
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Nitric oxide induces vascular smooth muscle relaxation by decreasing Ca2+ oscillations
Nitric oxide (NO) is known to induce vascular smooth muscle relaxation, but the underlying mechanism is not well understood. A study by Jose F. Perez-Zoghbi, Yan Bai, and Michael J. Sanderson, published in the Journal of General Physiology in 2010, investigated the effects of NO on airway smooth muscle contraction, Ca2+ signalling, and Ca2+ sensitivity in mouse lung slices.
The study found that NO induced airway smooth muscle cell (SMC) relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations. This was further supported by observations of NO's impact on Ca2+ oscillations in isolated porcine tracheal and vascular SMCs. The decrease in Ca2+ oscillations was accompanied by airway relaxation, with a biphasic change in oscillation frequency correlating to initial strong airway relaxation followed by a steady level of reduced airway contraction.
The study also examined the role of cGMP analogues and selective PKG activators, which induced airway relaxation and decreased Ca2+ oscillation frequency. Specifically, NOC-5 inhibited the increase in Ca2+ concentration and contraction induced by the photolytic release of inositol 1,4,5-trisphosphate (IP3) in airway SMCs. This suggests that NO acts through the cGMP-PKG pathway to inhibit the release of Ca2+ via the IP3 receptor, resulting in reduced Ca2+ oscillations and SMC relaxation.
Furthermore, the study found that NO-induced SMC relaxation was enhanced by zaprinast and vardenafil, selective inhibitors of cGMP-specific phosphodiesterase-5. However, ODQ, an inhibitor of soluble guanylyl cyclase, and Rp-8-pCPT-cGMPS, an inhibitor of protein kinase G (PKG), blocked the relaxation effect. These findings provide insights into the complex mechanisms by which NO induces vascular smooth muscle relaxation by modulating Ca2+ oscillations.
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Frequently asked questions
Nitrous oxide (N2O), commonly known as laughing gas, is a colourless, faintly sweet-smelling gas that is administered through a nosepiece or mask. It is a sedative that helps patients relax during procedures.
Nitrous oxide causes muscle relaxation by decreasing the frequency of agonist-induced Ca2+ oscillations. It also inhibits the release of calcium ions (Ca2+) via the IP3 receptor.
Nitrous oxide decreases peak torque at any given angular velocity. It also decreases maximal angular velocity. Overall, the impairment in muscle function induced by nitrous oxide is minimal and hence likely insignificant in clinical practice.
