Sunday, December 29, 2019

The Importance Of New Anti-TB Drugs - 1143 Words

New anti-TB drugs There is an urgent needed new anti-TB drug because of the complexity and toxicity of the first- and second-line TB drugs regimen but main problem is drug resistance. It is an enormous significance, the recent past few years have been discovered in the number of new anti-TB compounds and drugs in the pipeline, when a long time any drug did not discover. Recently, plenty numbers of drug candidates in the different stages under trials e.g. lead optimization stage, preclinical development, phase II and phase III clinical trials (Fig. 1). Bedaquiline (TMC-207, Bdq), Bdq, a diarylquinoline, inhibits of mycobacterial ATP synthase (Andries et al., 2005; Koul et al., 2007). It has inhibitory activity against both active and†¦show more content†¦It also can be used for the treatment of both drug sensitive and drug resistant TB. Prm is now under clinical trial III (fig. 1) in combination with moxifloxacin, linezolid (NCT02333799) and pyrazinamide (NCT02342886) and a multidrug regimen of moxifloxacin, bedaquiline, clofazimine (NCT02589782) and linezolid (Butler et al., 2016). Prm is prodrug that need to be metabolic activation by a deazaflavin (cofactor F420)-dependent nitroreductase (Ddn) (Manjunatha et al., 2006). It inhibits mycolic acids synthesis, which are constituents of the cell envelope of M. tuberculosis. Diacon et al. (2012, 2014, 2015) evaluated as a regimen composed of pretomanid for the 14-day early bactericidal activity, combined activity of moxifloxacin and pyrazinamide, to be significantly higher than that of bedaquiline only, combined of bedaquiline and pyrazinamide and combined of bedaquiline and pretomanid (but not combined of pretomanid and pyrazinamide. Surprisingly, additing of pyrazinamide increased the activity in case of both bedaquiline and pretomanid. Mutations in ddn (Rv3547), encoded by the deazaflavin-dependent nitroreductase, and fgd1 (Rv0407), encoded by the F420-dependent glucose-6-phosphate dehydrogenase, are the most mechanism of resistance to Prm (Manjunatha et al., 2006). A very recently Haver et al. (2015) assayed drug metabolism genes for potential mutations resistant to Prm andShow MoreRelatedMolecular Biology Of Drug Resistance In Mycobacterium Tuberculosis Research Report799 Words   |  4 Pagestreatment for TB. In patients who had never received treatment or who had received treatment for less than a month, their multidrug resistance is defined by the presence of a resistant strain of mycobacterium tuberculosis and in patients that have been previously treated, it is characte rised by the failure and relapse (Dhole et al., 2017). 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During the World War II, the unstable social conditions, poor nutrition, and serious overcrowding in Hong Kong increased the number of cases who died from T B (DH, 2006)Read MoreTuberculosis, Important Determinants, And The Health System3486 Words   |  14 Pages退å   ÃªÅ¸â€¦ription This section highlights the extent and dimensions of tuberculosis, important determinants, and the health system and/or public health program initiatives that are in place to address the issues. Tuberculosis Tuberculosis or TB as it is commonly known, is an infection caused by bacterium Mycobacterium tuberculosis. Tuberculosis is a communicable disease caused by bacteria affecting the lungs, and it spreads when infection airborne droplets, produced when a person with tuberculosis of

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