contraction

Carboprost tromethamine, a synthetic 15-methyl analogue of prostaglandin F2α, effectively promotes uterine contractions and significantly reduces bleeding during and post-delivery.

Phorbol 12,13-dibutyrate (Phorbol dibutyrate) is a PKC activator that inhibits α1-adrenoceptor-mediated positive inotropic effects in a concentration-dependent manner, induced by contraction of isolated rabbit vascular smooth muscle.

Prostaglandin E2 (PGE2) is a naturally occurring hormone involved in various physiological processes, such as smooth muscle contraction and relaxation, vasodilation and constriction, blood pressure regulation, and inflammatory regulation.

Calcium channel-modulator-1, a calcium channel-modulator (IC50: 0.8 μM), specializes in blocking aortic constriction.

RG-12525(NID 525) is an orally available, selective and competitive leukotriene D (LTD) antagonist that inhibits LTC4, LTD4 and LTE4-induced contraction of guinea pig thin-walled bands, with IC50 values of 2.6 nM, 2.5 nM, and 7 nM, respectively.RG-12525 inhibits CYP3A4, with a Ki value of 0.5 µM. RG-12525 is a novel and potent PPAR-γ agonist (IC50 value of about 60 nM) with species specificity for the study of asthma.

EMD57033 is a cardiac troponin C (cTnC) activator, a dominant Ca2+ sensitizer, which functions by binding to cardiac slow skeletal troponin C heterodimers to promote cardiac contraction.

Nexopamil (LU-49938) is a calcium channel antagonist and a 5-hydroxytryptamine 2A receptor antagonist. Nexopamil inhibits 5-HT-induced contraction and proliferation of mesenchymal cells.

Regrelor disodium (INS 50589) is a P2Y12 receptor antagonist that prevents thrombosis, effectively inhibits vascular smooth muscle cell contraction, curbs cell proliferation, and reduces inflammation.

mTOR HDAC-IN-1 (Compound 50) is a dual inhibitor of mTOR and HDAC, with IC50 values of 0.49 nM and 0.91 nM, respectively, holding potential as an anti-cancer agent [1].

Oxodipine, a dihydropyridine-type calcium antagonist, inhibited KCl-induced aortic contraction in rabbits and reduced cardiac force in less potent rat ventricular test-paper contractions. In rat cultured neonatal ventricular myocytes, Oxodipine reduced L-type Ca currents (I) with an IC of 0.24 μM, and against T-type Ca currents (I) with an IC of 0.41 μM. Oxodipine causes constipation in mice and gingival hyperplasia in dogs.

Cyclazosin HCl is a subtype-selective α-adrenergic receptor antagonist that competitively antagonizes norepinephrine-induced α(1B)-adrenergic receptor contraction and can be used to study non-arteritic ischemic optic neuropathy and other neurological diseases.

YM-58790 free base is a potent mAChR antagonist that inhibits M1 mAChR, M2 mAChR, and M3 mAChR with Ki values of 28 nM, 260 nM, and 15 nM, respectively. It inhibits reflex rhythmic bladder contractions in rats by inhibiting bladder pressurization.

Avosentan(Ro 67-0565; SPP-301) is a potent endothelin receptor (ETA) antagonist with strong inhibitory effects on endothelin-1-induced contraction and may have protective effects against chronic kidney disease. [2]

Dantrolene sodium (Dantrolene sodium salt) is a skeletal muscle relaxant and can interfere with excitation-contraction coupling in the muscle fiber. It is used for the treatment of spasticity and other neuromuscular abnormalities. Its mechanism of action is may not central, but dantrolene is usually grouped with the central muscle relaxants.

Carbachol (Carbamoylcholine chloride), an analog of acetylcholine, serves as a valuable tool in the investigation of various physiological responses mediated by nicotinic (nAChR) and muscarinic (mAChR) acetylcholine receptors. These responses include smooth muscle contraction, gut motility, and neuronal signaling. Known for its agonistic properties, Carbachol activates both nAChR and mAChR, with reported Ki values ranging from 10 to 10,000 nM for different receptor types and experimental preparations.

Doxylamine Succinate is a pyridine derivate histamine H1 antagonist with pronounced sedative properties. Doxylamine succinate (Decapryn) competitively blocks the histamine H1 receptor and limits the typical allergic and anaphylactic responses, including bronchoconstriction, vasodilation, increased capillary permeability, and spasmodic contraction of the gastrointestinal smooth muscle, caused by actions of histamine on bronchial and gastrointestinal smooth muscles, and on capillaries. This drug also prevents histamine-induced pain and itching of the skin and mucous membranes.

Salbutamol (Albuterol) stimulates beta2-adrenergic receptors in the lungs, thereby activating the enzyme adenylate cyclase that catalyzes the conversion of ATP to cyclic-3', 5'-adenosine monophosphate (cAMP). Salbutamol Sulfate is the sulfate salt of the short-acting sympathomimetic agent albuterol, a 1:1 racemic mixture of (R)-albuterol and (S)-albuterol with bronchodilator activity. Increased cAMP concentrations relax the bronchial smooth muscle, relieve bronchospasms, and reduce inflammatory cell mediator release, especially from mast cells. To a lesser extent, Salbutamol stimulates beta1-adrenergic receptors, thereby increasing the force and rate of myocardial contraction.

Nicardipine hydrochloride (YC-93 Hydrochloride) is the hydrochloride salt form of nicardipine, a synthetic derivative of nitrophenyl-pyridine and potent calcium channel blocker, Nicardipine (Nifedipine Family) blocks calcium ions from certain cell walls and inhibits contraction of coronary and peripheral arteries, resulting in lowered oxygen requirements for heart muscle and decreased arterial contraction and spasm. It is used clinically as a cerebral and coronary vasodilator.

Hydralazine hydrochloride (Apresoline) is the hydrochloride salt of hydralazine, a phthalazine derivative with antihypertensive and potential antineoplastic activities. Hydralazine alters intracellular calcium release and interferes with smooth muscle cell calcium influx, resulting in arterial vasodilatation. This agent also inhibits the phosphorylation of myosin protein and chelation of trace metals required for smooth muscle contraction, resulting in an increase in heart rate, stroke volume, and cardiac output. In addition to its cardiovascular effects, hydralazine inhibits DNA methyltransferase, which may result in inhibition of DNA methylation in tumor cells.

Dantrolene depresses excitation-contraction coupling in skeletal muscle by binding to the ryanodine receptor 1 and decreasing intracellular calcium concentration. Ryanodine receptors mediate the release of calcium from the sarcoplasmic reticulum, an essential step in muscle contraction. Dantrolene sodium hemiheptahydrate (Sodium dantrolene) is the sodium salt form of dantrolene, a hydantoin derivative, and direct-acting skeletal muscle relaxant.

Ozagrel (Domenan) is a selective thromboxane A(2) (TXA(2)) synthetase inhibitor with IC50 of 11 nM for rabbit platelet, used for the improvement of postoperative cerebrovascular contraction and accompanying cerebral ischaemia.

Ozagrel hydrochloride (OKY-046 HCl) is a selective thromboxane A(2) synthetase inhibitor used for the improvement of postoperative cerebrovascular contraction and accompanying cerebral ischaemia.

Fropofol (2-fluoro-1,3-diisopropylbenzene) is a non-anesthetic small molecule that specifically reduces myocardial contractility and inhibits myofilament contraction. It can be used in research on hypertrophic cardiomyopathy and cardiovascular diseases.

NP-1815-PX is a selective P2X4 receptor antagonist with anti-inflammatory and analgesic properties. It inhibits guinea pig tracheal bronchial smooth muscle contraction and can be used to study chronic pain.