CFTR is required for zinc- mediated antibacterial defense in human macrophages

• 成果类型: Article
• 署名作者: Das Gupta, Kaustav; Curson, James E. B.; Tarique, Abdullah A.; Kapetanovic, Ronan; Schembri, Mark A.; Fantino, Emmanuelle; Sly, Peter D.; Sweet, Matthew J.
• 署名单位: University of Queensland; University of Queensland; University of Queensland; Friedrich Miescher Institute for Biomedical Research; Universite de Tours; INRAE; University of Queensland
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13732
• DOI: 10.1073/pnas.2315190121
• 发表日期: 2024-02-20
• 关键词: cystic-fibrosis; pseudomonas-aeruginosa; inflammatory responses; biofilm formation; znta gene; CHILDREN; plasma; mouse; infections; resistance

摘要

Cystic fibrosis transmembrane conductance regulator (CFTR) is an anion transporter required for epithelial homeostasis in the lung and other organs, with CFTR mutations leading to the autosomal recessive genetic disease CF. Apart from excessive mucus accumulation and dysregulated inflammation in the airways, people with CF (pwCF) exhibit defective innate immune responses and are susceptible to bacterial respiratory pathogens such as Pseudomonas aeruginosa. Here, we investigated the role of CFTR in macrophage antimicrobial responses, including the zinc toxicity response that is used by these innate immune cells against intracellular bacteria. Using both pharmacological approaches, as well as cells derived from pwCF, we show that CFTR is required for uptake and clearance of pathogenic Escherichia coli by CSF- 1- derived primary human macrophages. CFTR was also required for E. coli- induced zinc accumulation and zinc vesicle formation in these cells, and E. coli residing in macrophages exhibited reduced zinc stress in the absence of CFTR function. Accordingly, CFTR was essential for reducing the intramacrophage survival of a zinc- sensitive E. coli mutant compared to wild - type E. coli. Ectopic expression of the zinc transporter SLC30A1 or treatment with exogenous zinc was sufficient to restore antimicrobial responses against E. coli in human macrophages. Zinc supplementation also restored bacterial killing in GM-CSF- derived primary human macrophages responding to P. aeruginosa, used as an in vitro macrophage model relevant to CF. Thus, restoration of the zinc toxicity response could be pursued as a therapeutic strategy to restore innate immune function and effective host defense in pwCF.