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Clofazimine As a Treatment for Multidrug-Resistant Tuberculosis: a Review
Scientia Pharmaceutica Review Clofazimine as a Treatment for Multidrug-Resistant Tuberculosis: A Review Rhea Veda Nugraha 1 , Vycke Yunivita 2 , Prayudi Santoso 3, Rob E. Aarnoutse 4 and Rovina Ruslami 2,* 1 Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung 40161, Indonesia; [email protected] 2 Division of Pharmacology and Therapy, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung 40161, Indonesia; [email protected] 3 Department of Internal Medicine, Faculty of Medicine, Universitas Padjadjaran—Hasan Sadikin Hospital, Bandung 40161, Indonesia; [email protected] 4 Department of Pharmacy, Radboud University Medical Center, Radboud Institute for Health Sciences, 6255HB Nijmegen, The Netherlands; [email protected] * Correspondence: [email protected] Abstract: Multidrug-resistant tuberculosis (MDR-TB) is an infectious disease caused by Mycobac- terium tuberculosis which is resistant to at least isoniazid and rifampicin. This disease is a worldwide threat and complicates the control of tuberculosis (TB). Long treatment duration, a combination of several drugs, and the adverse effects of these drugs are the factors that play a role in the poor outcomes of MDR-TB patients. There have been many studies with repurposed drugs to improve MDR-TB outcomes, including clofazimine. Clofazimine recently moved from group 5 to group B of drugs that are used to treat MDR-TB. This drug belongs to the riminophenazine class, which has lipophilic characteristics and was previously discovered to treat TB and approved for leprosy. This review discusses the role of clofazimine as a treatment component in patients with MDR-TB, and Citation: Nugraha, R.V.; Yunivita, V.; the drug’s properties. -
Clinical Pharmacology 1: Phase 1 Studies and Early Drug Development
Clinical Pharmacology 1: Phase 1 Studies and Early Drug Development Gerlie Gieser, Ph.D. Office of Clinical Pharmacology, Div. IV Objectives • Outline the Phase 1 studies conducted to characterize the Clinical Pharmacology of a drug; describe important design elements of and the information gained from these studies. • List the Clinical Pharmacology characteristics of an Ideal Drug • Describe how the Clinical Pharmacology information from Phase 1 can help design Phase 2/3 trials • Discuss the timing of Clinical Pharmacology studies during drug development, and provide examples of how the information generated could impact the overall clinical development plan and product labeling. Phase 1 of Drug Development CLINICAL DEVELOPMENT RESEARCH PRE POST AND CLINICAL APPROVAL 1 DISCOVERY DEVELOPMENT 2 3 PHASE e e e s s s a a a h h h P P P Clinical Pharmacology Studies Initial IND (first in human) NDA/BLA SUBMISSION Phase 1 – studies designed mainly to investigate the safety/tolerability (if possible, identify MTD), pharmacokinetics and pharmacodynamics of an investigational drug in humans Clinical Pharmacology • Study of the Pharmacokinetics (PK) and Pharmacodynamics (PD) of the drug in humans – PK: what the body does to the drug (Absorption, Distribution, Metabolism, Excretion) – PD: what the drug does to the body • PK and PD profiles of the drug are influenced by physicochemical properties of the drug, product/formulation, administration route, patient’s intrinsic and extrinsic factors (e.g., organ dysfunction, diseases, concomitant medications, -
Drugs and Drug Development: Making a Drug
Drugs and drug development: Making a drug Developing a novel drug Drug development is a long and expensive process A drug can be developed in a whole host of different ways. Constant improvement in technology has transformed drug design over the past few decades. Now, many laboratories in both universities and pharmaceutical companies make use of computers, robotics and artificial intelligence to aid in drug design. These techniques coupled with more traditional methods are becoming increasingly successful in designing novel drugs. One commonality between all the methods of drug design is that they are fraught with challenges. A pharmaceutical company may start with thousands of chemical compounds as potential drug candidates. Rigorous testing will whittle this down to a single chemical compound that can then be licensed to treat patients. Developing drugs is a risky and expensive business, but the potential profits are huge. The following step-by-step process provides a guide to how a compound in the laboratory becomes a disease-fighting drug. Option 1 explains the process of transforming initial research in a university lab (or biotechnology company) into a potential drug – about a quarter of drugs approved by the FDA between 1998 and 2007 began in this way. The remaining three-quarters began in pharmaceutical companies, as explained in option 2. STEP 1 – OPTION 1: Origins in the research lab In universities and research institutes all over the globe, many scientists dedicate their lives to understanding the molecular details of disease – how disease works. By using animal models, usually mice, they are able to identify specific biochemical pathways that are altered by the disease. -
Early-Phase Drug Discovery
Early-Phase Drug Discovery In partnership with the North Carolina Translational & Clinical Sciences (NC TraCs) Institute, RTI International is participating in the Early-Phase Drug Discovery Service (EPDD) to help researchers navigate challenges in the drug discovery process and move technologies toward development. This new RTI-based NC TraCS service can provide researchers with biological assay development and optimization, hit or lead identification, medicinal chemistry optimization, in vitro absorption, distribution, metabolism, excretion, and toxicology (ADMET), and in vivo pharmacokinetics. Overview Early stages of the drug discovery process contain hurdles that must be cleared before more robust drug development can commence. Once a molecular target is selected, drug discovery begins with identification of a hit and progresses toward a lead candidate through a series of structural optimizations. If no hit or lead molecules exist, a researcher must have a validated biological assay that can be optimized for high-throughput screening (HTS). Screening hits typically do not possess optimal drug- like properties. Therefore, their affinity, selectivity, and pharmacokinetic (PK) properties must be improved through structural modifications by a medicinal chemist. Once acceptable drug-like properties have been achieved, efficacy is validated through proof-of-principle studies in vivo. The most promising set of optimized compounds is then slated for further development. The EPDD can assist researchers by providing target development and assay miniaturization, identification of hits through HTS in a 25,000-compound library, lead optimization, in vitro ADMET assays, and preliminary in vivo PK studies. Services will be provided on a tiered basis. Tier 1 consists of consulting services designed to inform the researcher of gaps in his or her early-phase drug discovery plan. -
Comparative Thermodynamics of Partial Agonist Binding to An
COMPARATIVE THERMODYNAMICS OF PARTIAL AGONIST BINDING TO AN AMPA RECEPTOR BINDING DOMAIN A Dissertation Presented to the Faculty of the Graduate School of Cornell University In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy by Madeline Martínez May 2015 © 2015 Madeline Martínez ALL RIGHTS RESERVED Comparative Thermodynamics of Partial Agonist Binding to an AMPA Receptor Binding Domain Madeline Martínez, Ph.D. Cornell University 2015 AMPA receptors, ligand-gated cation channels endogenously activated by glutamate, mediate the majority of rapid excitatory synaptic transmission in the vertebrate central nervous system and are crucial for information processing within neural networks. Their involvement in a variety of neuropathologies and injured states makes them important therapeutic targets, and understanding the forces that drive the interactions between the ligands and protein binding sites is a key element in the development and optimization of potential drug candidates. Calorimetric studies yield quantitative data on the thermodynamic forces that drive binding reactions. This information can help elucidate mechanisms of binding and characterize ligand- induced conformational changes, as well as reduce the potential unwanted effects in drug candidates. The studies presented here characterize the thermodynamics of binding of a series of 5’substituted willardiine analogues, partial agonists to the GluA2 LBD under several conditions. The moiety substitutions (F, Cl, I, H, and NO2) explore a range of electronegativity, pKa, radii, and h-bonding capability. Competitive binding of these ligands to glutamate-bound GluA2 LBD at different pH conditions demonstrates the effects of charge in the enthalpic and entropic components of the Gibb’s free energy of binding. -
Research and Development in the Pharmaceutical Industry
Research and Development in the Pharmaceutical Industry APRIL | 2021 At a Glance This report examines research and development (R&D) by the pharmaceutical industry. Spending on R&D and Its Results. Spending on R&D and the introduction of new drugs have both increased in the past two decades. • In 2019, the pharmaceutical industry spent $83 billion dollars on R&D. Adjusted for inflation, that amount is about 10 times what the industry spent per year in the 1980s. • Between 2010 and 2019, the number of new drugs approved for sale increased by 60 percent compared with the previous decade, with a peak of 59 new drugs approved in 2018. Factors Influencing R&D Spending. The amount of money that drug companies devote to R&D is determined by the amount of revenue they expect to earn from a new drug, the expected cost of developing that drug, and policies that influence the supply of and demand for drugs. • The expected lifetime global revenues of a new drug depends on the prices that companies expect to charge for the drug in different markets around the world, the volume of sales they anticipate at those prices, and the likelihood the drug-development effort will succeed. • The expected cost to develop a new drug—including capital costs and expenditures on drugs that fail to reach the market—has been estimated to range from less than $1 billion to more than $2 billion. • The federal government influences the amount of private spending on R&D through programs (such as Medicare) that increase the demand for prescription drugs, through policies (such as spending for basic research and regulations on what must be demonstrated in clinical trials) that affect the supply of new drugs, and through policies (such as recommendations for vaccines) that affect both supply and demand. -
Inhaled Anti-Tubercular Therapy: Dry Powder Formulations, Device And
UNI SYDNEY LOGO INHALED ANTI-TUBERCULAR THERAPY: DRY POWDER FORMULATIONS, DEVICE AND TOXICITY CHALLENGES Thaigarajan Parumasivam A thesis submitted in fulfillment of the requirements for the degree of Doctor of Philosophy Faculty of Pharmacy The University of Sydney 2017 STATEMENT OF AUTHENTICITY This thesis is submitted to the University of Sydney in fulfilment of the requirements for the Degree of Doctor of Philosophy. The work described was carried out in the Faculty of Pharmacy and Centenary Institute under the supervision of Professor Hak-Kim Chan and Professor Warwick Britton The work presented in this thesis, is to the best of my knowledge and belief, original except as acknowledged in the text. The contributions of all co-authors in publications included in the body of the thesis have been declared, signed by each co-author and attached as an appendix. I hereby declare that I have not previously or concurrently submitted this material, either in full or in part, for a degree at this or any other institution. Thaigarajan Parumasivam Oct 2016 ii CONTENTS Acknowledgement ................................................................................................................. viii Glossary .................................................................................................................................... x Thesis abstract .......................................................................................................................... 1 Chapter 1 ....................................................................................................................... -
Treatment of Drug-Resistant Tuberculosis an Official ATS/CDC/ERS/IDSA Clinical Practice Guideline Payam Nahid, Sundari R
AMERICAN THORACIC SOCIETY DOCUMENTS Treatment of Drug-Resistant Tuberculosis An Official ATS/CDC/ERS/IDSA Clinical Practice Guideline Payam Nahid, Sundari R. Mase, Giovanni Battista Migliori, Giovanni Sotgiu, Graham H. Bothamley, Jan L. Brozek, Adithya Cattamanchi, J. Peter Cegielski, Lisa Chen, Charles L. Daley, Tracy L. Dalton, Raquel Duarte, Federica Fregonese, C. Robert Horsburgh, Jr., Faiz Ahmad Khan, Fayez Kheir, Zhiyi Lan, Alfred Lardizabal, Michael Lauzardo, Joan M. Mangan, Suzanne M. Marks, Lindsay McKenna, Dick Menzies, Carole D. Mitnick, Diana M. Nilsen, Farah Parvez, Charles A. Peloquin, Ann Raftery, H. Simon Schaaf, Neha S. Shah, Jeffrey R. Starke, John W. Wilson, Jonathan M. Wortham, Terence Chorba, and Barbara Seaworth; on behalf of the American Thoracic Society, U.S. Centers for Disease Control and Prevention, European Respiratory Society, and Infectious Diseases Society of America THIS OFFICIAL CLINICAL PRACTICE GUIDELINE WAS APPROVED BY THE AMERICAN THORACIC SOCIETY, THE EUROPEAN RESPIRATORY SOCIETY, AND THE INFECTIOUS DISEASES SOCIETY OF AMERICA SEPTEMBER 2019, AND WAS CLEARED BY THE U.S. CENTERS FOR DISEASE CONTROL AND PREVENTION SEPTEMBER 2019 Background: The American Thoracic Society, U.S. Centers for was judged to be very low, because the data came Disease Control and Prevention, European Respiratory Society, and from observational studies with significant loss to follow-up Infectious Diseases Society of America jointly sponsored this new and imbalance in background regimens between comparator practice guideline on the treatment of drug-resistant tuberculosis groups. Good practices in the management of MDR-TB are (DR-TB). The document includes recommendations on the described. On the basis of the evidence review, a clinical strategy treatment of multidrug-resistant TB (MDR-TB) as well as tool for building a treatment regimen for MDR-TB is also isoniazid-resistant but rifampin-susceptible TB. -
A Molecular and Chemical Perspective in Defining Melatonin Receptor Subtype Selectivity
Int. J. Mol. Sci. 2013, 14, 18385-18406; doi:10.3390/ijms140918385 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Review A Molecular and Chemical Perspective in Defining Melatonin Receptor Subtype Selectivity King Hang Chan and Yung Hou Wong * Biotechnology Research Institute, State Key Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Hong Kong; E-Mail: [email protected] * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +852-2358-7328; Fax: +852-2358-1552. Received: 2 June 2013; in revised form: 16 July 2013 / Accepted: 26 August 2013 / Published: 6 September 2013 Abstract: Melatonin is primarily synthesized and secreted by the pineal gland during darkness in a normal diurnal cycle. In addition to its intrinsic antioxidant property, the neurohormone has renowned regulatory roles in the control of circadian rhythm and exerts its physiological actions primarily by interacting with the G protein-coupled MT1 and MT2 transmembrane receptors. The two melatonin receptor subtypes display identical ligand binding characteristics and mediate a myriad of signaling pathways, including adenylyl cyclase inhibition, phospholipase C stimulation and the regulation of other effector molecules. Both MT1 and MT2 receptors are widely expressed in the central nervous system as well as many peripheral tissues, but each receptor subtype can be linked to specific functional responses at the target tissue. Given the broad therapeutic implications of melatonin receptors in chronobiology, immunomodulation, endocrine regulation, reproductive functions and cancer development, drug discovery and development programs have been directed at identifying chemical molecules that bind to the two melatonin receptor subtypes. -
Pretomanid Reference Number: CP.PMN.222 Effective Date: 03.01.20 Last Review Date: 02.20 Line of Business: Commercial, HIM, Medicaid Revision Log
Clinical Policy: Pretomanid Reference Number: CP.PMN.222 Effective Date: 03.01.20 Last Review Date: 02.20 Line of Business: Commercial, HIM, Medicaid Revision Log See Important Reminder at the end of this policy for important regulatory and legal information. Description Pretomanid is a nitroimidazooxazine antimycobacterial drug. FDA Approved Indication(s) Pretomanid is indicated as part of a combination regimen with bedaquiline and linezolid for the treatment of adults with pulmonary extensively drug resistant (XDR), treatment-intolerant or nonresponsive multidrug-resistant (MDR) tuberculosis (TB). Approval of this indication is based on limited clinical safety and efficacy data. This drug is indicated for use in a limited and specific population of patients. Limitation(s) of use: • Pretomanid tablets are not indicated for patients with: o Drug-sensitive (DS) tuberculosis o Latent infection due to Mycobacterium tuberculosis o Extra-pulmonary infection due to Mycobacterium tuberculosis o MDR-TB that is not treatment-intolerant or nonresponsive to standard therapy • Safety and effectiveness of pretomanid tablets have not been established for its use in combination with drugs other than bedaquiline and linezolid as part of the recommended dosing regimen. Policy/Criteria Provider must submit documentation (such as office chart notes, lab results or other clinical information) supporting that member has met all approval criteria. It is the policy of health plans affiliated with Centene Corporation® that pretomanid is medically necessary when the following criteria are met: I. Initial Approval Criteria A. Multi-Drug Resistant Tuberculosis (must meet all): 1. Diagnosis of pulmonary MDR-TB or XDR-TB; 2. Prescribed by or in consultation with an expert in the treatment of tuberculosis; 3. -
Of TB Drug Development: What's on the Horizon (For Patients with Or Without
The ‘third wave’ of TB drug development: What’s on the horizon (for patients with or without HIV) Kelly Dooley, MD, PhD 20th International Workshop on Clinical Pharmacology of HIV, Hepatitis, Other Antivirals Noordwijk, The Netherlands 15 May 2019 D I V I S I O N O F CLINICAL PHARMACOLOGY 1 Objectives • To give you an idea of the drug development pathway for TB drugs, the history, and the pipeline • To convince you to come work in the TB field, if you are not already The Problem State-of-the-state: Global burden of TB disease: 2017 In 2014, TB surpassed HIV as the #1 infectious disease killer worldwide In 2017, 10.0M cases TB is estimated to have killed 1 in 7 of humans who have ever lived WHO Global Tuberculosis Report 2018: http://www.who.int/tb/publications/global_report/en/ Latent TB infection (LTBI) About 1 in 4 persons Chaisson and Golub, Lancet Global Health, 2017 MDR- and XDR-TB: Global Health Emergencies Multidrug-resistant TB: Mycobacterium tuberculosis resistant to isoniazid Extensively drug-resistant TB: and rifampin: 558,000 incident cases in 2017 M. tuberculosis resistant to isoniazid, rifampin, fluoroquinolones, and injectable agents Reported in 123 WHO member state countries 6 HIV and Tuberculosis Epidemiology Global Burden of Tuberculosis, 2017 Total Population HIV-Infected Persons Incidence 10.0 million 900,000 (9%) Deaths 1.3 million 300,000 (23%) WHO Report 2018 Global Tuberculosis Control7 TB Treatment: Global Scientific Agenda Area Goals Drug-sensitive TB Treatment shortening to < 3 months More options for patients -
Drug Development
DRUG DEVELOPMENT www.acuteleuk.org Drug Development Process Only about 2% of substances evaluated in early research make it to the market as new medicines Number of drugs in the R&D pipeline Number of drugs in the R&D pipeline worldwide 2019 vs. 2020, by development phase Source: https://www.statista.com/ A minimum of a 10-year plan It takes over 10 years and on average costs between €400 million and €1.5 billion before a new medicine can be made available to patients and reimbursement starts Drug development means … What is the rationale to initiate drug development ? • Scientific and Intellectual Property – How does the drug work? • Molecule structure and properties • Mechanism of action • Biological activity (bioassays, drug/target interaction, affinity, specificity,…) – What data support the approach? • Literature validation • In-house preclinical/clinical data – Who owns the intellectual property? What is the rationale to initiate drug development ? • Disease overview and unmet medical need – What is known about disease pathogenesis (translational medicine)? – Where in the disease process should drug enter? Greatest unmet need? – Is this disease part of a disease family? If so which fits best with drug and regulatory history? Is there an orphan approach? – Is this disease field crowded? – Has the indication been clinically studied before (in drug studies)? – What is the event rate for target medical problems? (Make the statisticians happy) – Are there “approvable” endpoints for the unmet needs? – If not, what endpoints seem reasonable: