Identification of potentiators of antimicrobial activity against multidrug-resistant Burkholderia cepacia complex infections in cystic fibrosis

囊性纤维化中多重耐药洋葱伯克霍尔德杆菌复合感染抗菌活性增强剂的鉴定

基本信息

项目摘要

Project Summary/Abstract Pulmonary exacerbations are one of the most common manifestations of cystic fibrosis (CF), a life-limiting, multisystem disease that affects 30,000 Americans. These exacerbations are often caused by highly drug- resistant Gram-negative bacteria that colonize the lungs of people with CF. Among such organisms, the most feared is the Burkholderia cepacia complex (Bcc). Bcc have extensive intrinsic antibiotic resistance and readily acquire further resistance mechanisms under selective pressure during antibiotic treatment; pan-resistant strains can emerge following repeated antibiotic courses. Bcc infection is associated with frequent hospitalizations and increased mortality in people with CF, but there are no new antibiotics with activity against BCC in the development pipeline, and alternative treatment strategies are urgently needed. The goal of the proposed research is to identify known bioactive compounds that have activity against Bcc either alone or in combination with antibiotics. This work will be carried out through two aims. In Aim 1, we will test 14,000 known bioactive small molecules, including all FDA-approved drugs, both alone and in combination with six antibiotics commonly used to treat Bcc (meropenem, ceftazidime, minocycline, levofloxacin, trimethoprim-sulfamethoxazole, and tobramycin, each at an individually ineffective concentration), to identify compounds and compound/antibacterial combinations that inhibit growth of a representative Bcc isolate. In Aim 2, we will further characterize the activity of promising compounds identified in the screen using several complementary in vitro models. First, we will perform spectrum-of-activity and dose-response testing of compounds and combinations against a collection of 30 Bcc isolates using inkjet printer-assisted checkerboard array synergy studies as well as time-kill synergy studies. We will also evaluate the capacity of compounds to prevent the emergence of antibiotic resistance during treatment. Then, in order to better approximate the environment in which bacteria live in the lungs of people with CF, which is characterized by increased viscosity, high concentrations of mucin, albumin, amino acids, and free DNA, and lower oxygen tension relative to standard in vitro antimicrobial susceptibility testing conditions, we will test compounds and combinations using an artificial sputum medium in a microaerophilic environment. With this approach, we will assess whether activity is maintained under conditions more closely resembling those in which they would be used in clinical practice. When the project is completed, we expect to have identified a collection of molecules with previously unrecognized activity against Bcc and to have determined which of these are most likely to be clinically effective in people with CF. Identification of well-characterized compounds that have potential therapeutic activity against Bcc will facilitate future evaluation in animal models and human trials in order to develop desperately needed new therapeutic options for Bcc.
项目总结/文摘

项目成果

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Thea Brennan-Krohn其他文献

Thea Brennan-Krohn的其他文献

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{{ truncateString('Thea Brennan-Krohn', 18)}}的其他基金

Susceptibility and resistance of multidrug-resistant gram-negative bacteria to novel beta-lactam/beta-lactamase inhibitor combinations
多重耐药革兰氏阴性菌对新型β-内酰胺/β-内酰胺酶抑制剂组合的敏感性和耐药性
  • 批准号:
    10748676
  • 财政年份:
    2023
  • 资助金额:
    $ 21.88万
  • 项目类别:
Antimicrobial Synergy for Carbapenem-Resistant Enterobacteriaceae
对碳青霉烯类耐药肠杆菌科细菌的抗菌协同作用
  • 批准号:
    10328479
  • 财政年份:
    2018
  • 资助金额:
    $ 21.88万
  • 项目类别:
Antimicrobial Synergy for Carbapenem-Resistant Enterobacteriaceae
对碳青霉烯类耐药肠杆菌科细菌的抗菌协同作用
  • 批准号:
    10084800
  • 财政年份:
    2018
  • 资助金额:
    $ 21.88万
  • 项目类别:
Antimicrobial Synergy for Carbapenem-Resistant Enterobacteriaceae - Administrative Supplement
耐碳青霉烯类肠杆菌科细菌的抗菌协同作用 - 行政补充
  • 批准号:
    10117330
  • 财政年份:
    2018
  • 资助金额:
    $ 21.88万
  • 项目类别:

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