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Bian C, Zhang J, Zheng X, Qiao M, Li Y, Chen X, Si S. Synthesis and structure-activity relationships of novel 14-membered 2-fluoro ketolides with structural modification at the C11 position. Eur J Med Chem 2024; 267:116181. [PMID: 38354519 DOI: 10.1016/j.ejmech.2024.116181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/16/2024] [Accepted: 01/24/2024] [Indexed: 02/16/2024]
Abstract
A series of novel C11 substituted 14-membered 2-fluoro ketolides were synthesized and evaluated for their antibacterial activity against erythromycin-resistant and erythromycin-susceptible clinical isolates and strains from ATCC. The overall antibacterial spectra of the semi-synthetic antibiotics are similar to that of telithromycin (TEL) and most of them exhibited excellent activity against Gram-positive bacteria (S. epidermidis, S. pneumoniae, S. aureus) and several Gram-negative bacteria (M. catarrhalis, H. influenza). Compounds 11c, 11g, 11h, 11q, 12a, 12b, 12d and 12e displayed 4-16 fold more potency than TEL against all the tested erythromycin-resistant S. epidermidis strains and S. pneumonia SPN19-8 and SPN19-8. Compounds 11b, 11c, 11e, 11g, 11h, 11q, 12a, 12b and 12c showed at least 8 fold potency than TEL against erythromycin-resistant M. catarrhalis BCA19-5 and BCA19-6. Molecular docking suggested compound 12d oriented the macrolide ring and side chain similarly to solithromycin (SOL). Noticeably an additional hydrogen bond was observed between the Lys90 residue of ribosome protein L22 and the carbamate group at the C11 position, which might provide a rational explanation for the enhanced antibacterial activity of target compounds. Therefore this research would offer a new perspective for further structural optimization of the C11 side chain. Based on the results of antibacterial activity, cytotoxicity and structural diversity, 5 compounds (11a, 11b, 11h, 12d and 12i) were selected for the stability testing of human liver microsomes and compound 11a exhibited preferable metabolic stability.
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Affiliation(s)
- Cong Bian
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China
| | - Jing Zhang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China
| | - Xiao Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China
| | - Mengqian Qiao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China
| | - Yan Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China.
| | - Xiaofang Chen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China.
| | - Shuyi Si
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, No.1 TiantanXili, Beijing 100050, China.
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2
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Kiyomiya K, Tomabechi R, Saito N, Watai K, Takada T, Shirasaka Y, Kishimoto H, Higuchi K, Inoue K. Macrolide and Ketolide Antibiotics Inhibit the Cytotoxic Effect of Trastuzumab Emtansine in HER2-Positive Breast Cancer Cells: Implication of a Potential Drug-ADC Interaction in Cancer Chemotherapy. Mol Pharm 2023; 20:6130-6139. [PMID: 37971309 DOI: 10.1021/acs.molpharmaceut.3c00490] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Macrolides are widely used for the long-term treatment of infections and chronic inflammatory diseases. The pharmacokinetic features of macrolides include extensive tissue distribution because of favorable membrane permeability and accumulation within lysosomes. Trastuzumab emtansine (T-DM1), a HER2-targeting antibody-drug conjugate (ADC), is catabolized in the lysosomes, where Lys-SMCC-DM1, a potent cytotoxic agent, is processed by proteinase degradation and subsequently released from the lysosomes to the cytoplasm through the lysosomal membrane transporter SLC46A3, resulting in an antitumor effect. We recently demonstrated that erythromycin and clarithromycin inhibit SLC46A3 and attenuate the cytotoxicity of T-DM1; however, the effect of other macrolides and ketolides has not been determined. In this study, we evaluated the effect of macrolide and ketolide antibiotics on T-DM1 cytotoxicity in a human breast cancer cell line, KPL-4. Macrolides used in the clinic, such as roxithromycin, azithromycin, and josamycin, as well as solithromycin, a ketolide under clinical development, significantly attenuated T-DM1 cytotoxicity in addition to erythromycin and clarithromycin. Of these, azithromycin was the most potent inhibitor of T-DM1 efficacy. These antibiotics significantly inhibited the transport function of SLC46A3 in a concentration-dependent manner. Moreover, these compounds extensively accumulated in the lysosomes at the levels estimated to be 0.41-13.6 mM when cells were incubated with them at a 2 μM concentration. The immunofluorescence staining of trastuzumab revealed that azithromycin and solithromycin inhibit the degradation of T-DM1 in the lysosomes. These results suggest that the attenuation of T-DM1 cytotoxicity by macrolide and ketolide antibiotics involves their lysosomal accumulation and results in their greater lysosomal concentrations to inhibit the SLC46A3 function and T-DM1 degradation. This suggests a potential drug-ADC interaction during cancer chemotherapy.
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Affiliation(s)
- Keisuke Kiyomiya
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Ryuto Tomabechi
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
- Laboratory of Pharmaceutics, Kitasato University School of Pharmacy, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Naoki Saito
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Kenta Watai
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tappei Takada
- Department of Pharmacy, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
| | - Yoshiyuki Shirasaka
- Faculty of Pharmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Hisanao Kishimoto
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Kei Higuchi
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Katsuhisa Inoue
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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Gomez F, Veita J, Laudanski K. Antibiotics and ECMO in the Adult Population-Persistent Challenges and Practical Guides. Antibiotics (Basel) 2022; 11:338. [PMID: 35326801 PMCID: PMC8944696 DOI: 10.3390/antibiotics11030338] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/24/2022] [Accepted: 02/26/2022] [Indexed: 02/04/2023] Open
Abstract
Extracorporeal membrane oxygenation (ECMO) is an emerging treatment modality associated with a high frequency of antibiotic use. However, several covariables emerge during ECMO implementation, potentially jeopardizing the success of antimicrobial therapy. These variables include but are not limited to: the increased volume of distribution, altered clearance, and adsorption into circuit components, in addition to complex interactions of antibiotics in critical care illness. Furthermore, ECMO complicates the assessment of antibiotic effectiveness as fever, or other signs may not be easily detected, the immunogenicity of the circuit affects procalcitonin levels and other inflammatory markers while disrupting the immune system. We provided a review of pharmacokinetics and pharmacodynamics during ECMO, emphasizing practical application and review of patient-, illness-, and ECMO hardware-related factors.
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Affiliation(s)
- Francisco Gomez
- Department of Neurology, University of Missouri, Columbia, MO 65021, USA;
| | - Jesyree Veita
- Society for Healthcare Innovation, Philadelphia, PA 19146, USA;
| | - Krzysztof Laudanski
- Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, PA 19146, USA
- Leonard Davis Institute for HealthCare Economics, University of Pennsylvania, Philadelphia, PA 19146, USA
- Department of Neurology, University of Pennsylvania, Philadelphia, PA 19146, USA
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Clinton JW, Kiparizoska S, Aggarwal S, Woo S, Davis W, Lewis JH. Drug-Induced Liver Injury: Highlights and Controversies in the Recent Literature. Drug Saf 2021; 44:1125-1149. [PMID: 34533782 PMCID: PMC8447115 DOI: 10.1007/s40264-021-01109-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2021] [Indexed: 12/13/2022]
Abstract
Drug-induced liver injury (DILI) remains an important, yet challenging diagnosis for physicians. Each year, additional drugs are implicated in DILI and this year was no different, with more than 1400 articles published on the subject. This review examines some of the most significant highlights and controversies in DILI-related research over the past year and their implications for clinical practice. Several new drugs were approved by the US Food and Drug Administration including a number of drugs implicated in causing DILI, particularly among the chemotherapeutic classes. The COVID-19 pandemic was also a major focus of attention in 2020 and we discuss some of the notable aspects of COVID-19-related liver injury and its implications for diagnosing DILI. Updates in diagnostic and causality assessments related to DILI such as the Roussel Uclaf Causality Assessment Method are included, mindful that there is still no single biomarker or diagnostic tool to unequivocally diagnose DILI. Glutamate dehydrogenase received renewed attention as being more specific than alanine aminotransferase. There were a few new reports of previously unrecognized hepatotoxins, including immune modulators and novel gene therapy drugs that we highlight. Updates and new developments of previously described hepatotoxins, such as immune checkpoint inhibitors and anti-tuberculosis drugs are reviewed. Finally, novel technologies such as organoid culture systems to better predict DILI preclinically may be coming of age and determinants of hepatocyte loss, such as calculating PALT are poised to improve our current means of estimating DILI severity and the risk of acute liver failure.
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Affiliation(s)
- Joseph William Clinton
- Department of Internal Medicine, Medstar Georgetown University Hospital, Washington, DC, USA.
| | - Sara Kiparizoska
- Department of Internal Medicine, Medstar Georgetown University Hospital, Washington, DC, USA
| | - Soorya Aggarwal
- Division of Gastroenterology and Hepatology, Medstar Georgetown University Hospital, Washington, DC, USA
| | - Stephanie Woo
- Department of Internal Medicine, Medstar Georgetown University Hospital, Washington, DC, USA
| | - William Davis
- Department of Internal Medicine, Medstar Georgetown University Hospital, Washington, DC, USA
| | - James H Lewis
- Division of Gastroenterology and Hepatology, Medstar Georgetown University Hospital, Washington, DC, USA
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Tosca EM, Bartolucci R, Magni P, Poggesi I. Modeling approaches for reducing safety-related attrition in drug discovery and development: a review on myelotoxicity, immunotoxicity, cardiovascular toxicity, and liver toxicity. Expert Opin Drug Discov 2021; 16:1365-1390. [PMID: 34181496 DOI: 10.1080/17460441.2021.1931114] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Introduction:Safety and tolerability is a critical area where improvements are needed to decrease the attrition rates during development of new drug candidates. Modeling approaches, when smartly implemented, can contribute to this aim.Areas covered:The focus of this review was on modeling approaches applied to four kinds of drug-induced toxicities: hematological, immunological, cardiovascular (CV) and liver toxicity. Papers, mainly published in the last 10 years, reporting models in three main methodological categories - computational models (e.g., quantitative structure-property relationships, machine learning approaches, neural networks, etc.), pharmacokinetic-pharmacodynamic (PK-PD) models, and quantitative system pharmacology (QSP) models - have been considered.Expert opinion:The picture observed in the four examined toxicity areas appears heterogeneous. Computational models are typically used in all areas as screening tools in the early stages of development for hematological, cardiovascular and liver toxicity, with accuracies in the range of 70-90%. A limited number of computational models, based on the analysis of drug protein sequence, was instead proposed for immunotoxicity. In the later stages of development, toxicities are quantitatively predicted with reasonably good accuracy using either semi-mechanistic PK-PD models (hematological and cardiovascular toxicity), or fully exploited QSP models (immuno-toxicity and liver toxicity).
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Affiliation(s)
- Elena M Tosca
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Roberta Bartolucci
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Paolo Magni
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Italo Poggesi
- Clinical Pharmacology & Pharmacometrics, Janssen Research & Development, Beerse, Belgium
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Bauer MR, Di Fruscia P, Lucas SCC, Michaelides IN, Nelson JE, Storer RI, Whitehurst BC. Put a ring on it: application of small aliphatic rings in medicinal chemistry. RSC Med Chem 2021; 12:448-471. [PMID: 33937776 PMCID: PMC8083977 DOI: 10.1039/d0md00370k] [Citation(s) in RCA: 152] [Impact Index Per Article: 50.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 12/18/2020] [Indexed: 12/15/2022] Open
Abstract
Aliphatic three- and four-membered rings including cyclopropanes, cyclobutanes, oxetanes, azetidines and bicyclo[1.1.1]pentanes have been increasingly exploited in medicinal chemistry for their beneficial physicochemical properties and applications as functional group bioisosteres. This review provides a historical perspective and comparative up to date overview of commonly applied small rings, exemplifying key principles with recent literature examples. In addition to describing the merits and advantages of each ring system, potential hazards and liabilities are also illustrated and explained, including any significant chemical or metabolic stability and toxicity risks.
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Affiliation(s)
- Matthias R Bauer
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
| | - Paolo Di Fruscia
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
| | - Simon C C Lucas
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
| | | | - Jennifer E Nelson
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
| | - R Ian Storer
- Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca Cambridge UK
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Abstract
Inhibiting eukaryotic protein translation with small molecules is emerging as a powerful therapeutic strategy. The advantage of targeting cellular translational machinery is that it is required for the highly proliferative state of many neoplastic cells, replication of certain viruses, and ultimately the expression of a wide variety of protein targets. Although, this approach has been exploited to develop clinical agents, such as homoharringtonine (HHT, 1), used to treat chronic myeloid leukemia (CML), inhibiting components of the translational machinery is often associated with cytotoxic phenotypes. However, recent studies have demonstrated that certain small molecules can inhibit the translation of specific subsets of proteins, leading to lower cytotoxicity, and opening-up therapeutic opportunities for translation inhibitors to be deployed in indications beyond oncology and infectious disease. This review summarizes efforts to develop inhibitors of the eukaryotic translational machinery as therapeutic agents and highlights emerging opportunities for translation inhibitors in the future.
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Affiliation(s)
- Angela Fan
- Department of Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Phillip P Sharp
- Department of Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
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Wang Y, Xiong Y, Wang Z, Zheng J, Xu G, Deng Q, Wen Z, Yu Z. Comparison of solithromycin with erythromycin in Enterococcus faecalis and Enterococcus faecium from China: antibacterial activity, clonality, resistance mechanism, and inhibition of biofilm formation. J Antibiot (Tokyo) 2020; 74:143-151. [PMID: 33077828 DOI: 10.1038/s41429-020-00374-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/16/2020] [Accepted: 08/17/2020] [Indexed: 11/09/2022]
Abstract
Solithromycin (SOL), a fourth-generation macrolide and ketolide, has been reported to have robust antibacterial activity against a wide spectrum of Gram-positive bacteria. However, the impact of SOL on planktonic growth and biofilm formation of clinical enterococcus isolates remains unclear. In this study, 276 Enterococcus faecalis isolates and 122 Enterococcus faecium were retrospectively collected from a tertiary hospital from China. SOL against clinical isolates of enterococci from China were evaluated the antimicrobial activity in comparison with erythromycin, and explore its relationship with the clonality, virulence genes and resistance mechanism of these isolates. Our data showed that the MICs of SOL against clinical E. faecalis and E. faecium isolates from China were ≤4 and ≤8 mg l-1, respectively. ST16 and ST179 were regarded as the risk factor to SOL resistance in E. faecalis. SOL could inhibit but not eradicate the biofilm formation of E. faecalis. The bactericidal effects of SOL against E. faecalis and E. faecium were demonstrated to be similar to linezolid and vancomycin using time-kill assays. In conclusion, SOL showed significantly enhanced antibacterial activity against clinical isolates of E. faecalis and E. faecium from China in comparison to erythromycin. Furthermore, SOL could inhibit the biofilm formation of E. faecalis and have the similar bactericidal ability as linezolid and vancomycin against both E. faecalis and E. faecium.
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Affiliation(s)
- Yu Wang
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Yanpeng Xiong
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Zhanwen Wang
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Jinxin Zheng
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Guangjian Xu
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Qiwen Deng
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China
| | - Zewen Wen
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China.
| | - Zhijian Yu
- Department of Infectious Diseases and the Key Lab of Endogenous Infection, The Sixth Affiliated Hospital of Shenzhen University Health Science Center, No 89, Taoyuan Road, Nanshan District, 518052, Shenzhen, China.
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Grgičević I, Mikulandra I, Bukvić M, Banjanac M, Radovanović V, Habinovec I, Bertoša B, Novak P. Discovery of macrozones, new antimicrobial thiosemicarbazone-based azithromycin conjugates: design, synthesis and in vitro biological evaluation. Int J Antimicrob Agents 2020; 56:106147. [PMID: 32853671 DOI: 10.1016/j.ijantimicag.2020.106147] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 07/09/2020] [Accepted: 08/19/2020] [Indexed: 12/20/2022]
Abstract
Increasing bacterial resistance to existing antibiotics presents a serious threat to human health, and new antibacterial agents are desperately needed. Unfortunately, the number of newly marketed antibiotics has decreased dramatically in recent years. Withdrawal of the macrolide antibiotic telithromycin and the inability of solithromycin to gain marketing approval have prompted our efforts to search for new anti-infective macrolide compounds. Here we present the design, synthesis and biological evaluation of a novel hybrid class of azithromycin conjugates, the macrozones. Evaluation of prepared compounds against a panel of pathogenic bacteria revealed that these molecules showed excellent activities against susceptible Streptococcus pneumoniae, Streptococcus pyogenes and Enterococcus faecalis strains comparable with or better than azithromycin. Furthermore, prepared macrozones exhibited excellent activity against efflux resistant S. pneumoniae, which was 32 times better than that of azithromycin, and very good activity against an efflux resistant Staphylococcus aureus strain against which azithromycin is inactive. The results described here can serve as a good basis to guide further activities directed toward the discovery of more potent macrolide anti-infectives.
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Affiliation(s)
- Ivan Grgičević
- Fidelta, Ltd., Prilaz baruna Filipovića 29, 10000 Zagreb, Croatia
| | - Ivana Mikulandra
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Mirjana Bukvić
- Fidelta, Ltd., Prilaz baruna Filipovića 29, 10000 Zagreb, Croatia
| | - Mihailo Banjanac
- Fidelta, Ltd., Prilaz baruna Filipovića 29, 10000 Zagreb, Croatia
| | | | - Iva Habinovec
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Branimir Bertoša
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Predrag Novak
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia.
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