中文摘要：

抗微生物抵抗力的上升導致對評估噬菌體療法的新興趣。在小鼠模型中，針對銅綠假單胞菌引起的急性肺炎的高效治療依賴于噬菌體與中性粒細胞的協(xié)同抗菌活性。在這里，我們展示了荷蘭Liposoma巨噬細胞清除劑ClodronateLiposomes清除肺泡巨噬細胞（AM）縮短成年雄性小鼠的生存時間，但并未提高肺中銅綠假單胞菌的負荷。令人意外的是，在接受噬菌體治療后，AM清除的小鼠的肺中銅綠假單胞菌水平顯著低于免疫能力正常的小鼠。為了探討治療小鼠中AM缺失益處的潛在機制，我們開發(fā)了一個關于噬菌體、細菌和先天免疫系統(tǒng)動態(tài)的數(shù)學模型。根據(jù)數(shù)據(jù)擬合的模型的模擬結果表明，AM減少了肺中的噬菌體密度。我們實驗確認，在免疫能力正常的小鼠中，噬菌體在體內(nèi)衰減的速度比AM缺失的動物快，且AM能夠吞噬治療性噬菌體。這些發(fā)現(xiàn)表明噬菌體、細菌與免疫系統(tǒng)之間的反饋作用在臨床環(huán)境中影響噬菌體療法的結果。

英文摘要：

The rise of antimicrobial resistance leads to renewed interest in evaluating phage therapy. In murine models highly effective treatment of acute pneumonia caused by Pseudomonas aeruginosa relies on the synergistic antibacterial activity of bacteriophages with neutrophils. Here, we show that depletion of alveolar macrophages (AM) shortens the survival of adult male mice without boosting the P. aeruginosa load in the lungs. Unexpectedly, upon bacteriophage treatment, pulmonary levels of P. aeruginosa are significantly lower in AM-depleted than in immunocompetent mice. To explore potential mechanisms underlying the benefit of AM-depletion in treated mice, we develop a mathematical model of bacteriophage, bacteria, and innate immune system dynamics. Simulations from the model fitted to data suggest that AM reduce bacteriophage density in the lungs. We experimentally confirm that the in vivo decay of bacteriophage is faster in immunocompetent compared to AM-depleted animals and that AM phagocytize therapeutic bacteriophage. These findings demonstrate the involvement of feedback between bacteriophage, bacteria, and the immune system in shaping the outcomes of phage therapy in clinical settings.

論文信息：

論文題目：Macrophage-induced reduction of bacteriophage density limits the efficacy of in vivo pulmonary phage therapy

期刊名稱：Nature Communications

時間期卷：16, Article number: 5725 (2025)

在線時間：2025年7月1日

DOI：doi.org/10.1038/s41467-025-61268-1

產(chǎn)品信息：

貨號：CP-005-005

規(guī)格：5ml+5ml

品牌：Liposoma

產(chǎn)地：荷蘭

名稱：Clodronate Liposomes and Control Liposomes

辦事處：Target Technology(靶點科技)

Clodronate Liposomes氯膦酸鹽脂質體清除肺泡巨噬細胞（AM），在細菌感染的炎性模型中單核巨噬細胞功能研究，荷蘭Liposoma巨噬細胞清除劑Clodronate Liposomes見刊于Nature Communications：巨噬細胞引起的噬菌體密度降低限制了體內(nèi)肺部噬菌體治療的效果

Liposoma巨噬細胞清除劑Clodronate Liposomes氯膦酸二鈉脂質體的材料和方法：

Macrophage depletion

AM depletion was obtained by the intra-tracheal administration a single dose of 400?µg of clodronate liposomes or empty liposomes (LIPOSOMA, city), four days prior infection. For the intra-tracheal administration, the mice were anesthetized by intraperitoneal injection of a mixture of two vol of ketamine (10?mg/mL) and one vol of xylazine (1?mg/mL) in a solution of NaCl 0.9%. The dose administrated to each mouse was adjusted to 0.01?mg of the ketamine-xylazine mixture per 1?g of body mass.　　

材料和方法文獻截圖：