dna relaxation

Lomefloxacin hydrochloride (Okacyn) inhibits DNA gyrase, a type II topoisomerase involved in the induction or relaxation of supercoiling during DNA replication. This inhibition leads to a decrease in DNA synthesis during bacterial replication, resulting in cell growth inhibition and eventually cell lysis. Lomefloxacin Hydrochloride is the hydrochloride salt form of lomefloxacin, a synthetic broad-spectrum fluoroquinolone with antibacterial activity.

Quazinone is a selective inhibitor of phosphodiesterase 3 (PDE3) with positive inotropic and vasodilating properties. It induces relaxation of precontracted isolated human cavernous smooth muscle (IC50 = 4.2 μM), increases myocardial contractile force in anesthetized open-chest dogs in a dose-dependent manner (10-300 μg kg), decreases systolic and diastolic blood pressure, and inhibits DNA synthesis induced by the PDGF isoform PDGF-BB in bovine coronary artery smooth muscle cells in a concentration-dependent manner.

ARN-21934 is a potent, highly selective, blood-brain barrier (BBB) penetrant inhibitor for human topoisomerase II α over β. It inhibits DNA relaxation with an IC50 of 2 μM, compared to 120 μM for Etoposide. ARN-21934 exhibits favorable in vivo pharmacokinetic properties and shows promise in anticancer research, displaying affinity for topoIIα with an IC50 of 2 μM and for topoIIβ with an IC50 of 120 μM. It demonstrates activity against human cancer cell lines including melanoma (A375: 12.6 μM, G-361: 8.1 μM), breast (MCF7: 15.8 μM), endometrial (HeLa: 38.2 μM), lung (A549: 17.1 μM), and prostate (DU145: 11.5 μM) cancer cells. Following a single intraperitoneal injection of 10 mg kg, ARN-21934 achieves a peak plasma concentration of 0.68 μg mL in 15 minutes, with a half-life of 149 minutes, and remains detectable in plasma and the brain for up to 360 minutes. [1] Jose Antonio Ortega, et al. Novel, Potent, and Druglike Tetrahydroquinazoline Inhibitor That Is Highly Selective for Human Topoisomerase II α over β. J Med Chem. 2020 Nov 12;63(21):12873-12886.

1. Kakuol has antifungal activity, it can completely inhibit the mycelial growth of Botrytis cinerea Pers ex Fr and Cladosporium cucumerinum Ellis & Arthur at 5 microg ml(-1) and 3 microg ml(-1), respectively. 2. kakuol and a derivative analogue are able

Gepotidacin mesylate dihydrate (GSK2140944 mesylate dihydrate) is an orally available triazaacenaphthylene antibiotic with antibacterial activity. Gepotidacin mesylate dihydrate is an inhibitor of bacterial type II topoisomerase. Gepotidacin mesylate dihydrate inhibits bacterial DNA replication by blocking topoisomerase and can be used to study bacterial infection.

Eicosapentaenoic Acid (EPA) sodium, an orally active omega-3 long-chain polyunsaturated fatty acid (ω-3 LC-PUFA), demonstrates a unique ability to demethylate DNA, thereby facilitating the re-expression of the tumor suppressor gene CCAAT enhancer-binding protein δ (C EBPδ). This compound also activates the RAS ERK C EBPβ pathway by demethylating H-Ras intron 1 CpG island in U937 leukemia cells and promotes the relaxation of vascular smooth muscle cells, leading to vasodilation.

8-Chloroadenosine-5'-triphosphate (8-chloro ATP), a potent metabolite of the anticancer agent 8-chloro cyclic AMP (cAMP) and a nucleotide derivative, is produced through the biotransformation of 8-chloro cAMP into 8-chloroadenosine, followed by mono- and diphosphate intermediates. Accumulating for up to 12 hours after the administration of 8-chloro cAMP or 8-chloroadenosine, 8-chloro ATP inhibits cell growth, diminishes endogenous ATP levels, and reduces RNA synthesis without affecting DNA synthesis in multiple myeloma cells derived from patients. Moreover, it obstructs topoisomerase II-α-mediated relaxation of supercoiled pUC19 DNA at concentrations ranging from 1.5 to 8 mM and decreases topoisomerase II-α-enhanced ATP hydrolysis by 50% at a concentration of 1 mM in K562 human myelocytic leukemia cells.

1-Cinnamoylpyrrolidine, a natural product prepared from Piper caninum, can be used as a DNA strand breaking agent, inducing the relaxation of the plasmid pBR322 DNA superhelix in the presence of Cu2+. 1-Cinnamoylpyrrolidine inhibits PAF-induced platelet aggregation with an IC50 value of 37.3 μM. value was 37.3 μM.

Vincosamide is an alkaloid from Psychotria leiocarpa extract, inhibits the acetylcholinesterase (AChE) activity with anti-inflammatory activity. Vincosamide can effect relaxation of the supercoiled pBR322 plasmid DNA in the presence of Cu2+.