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Lytic Cycle of Bacteriophages

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...

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Stability Considerations for Bacteriophages in Liquid Formulations Designed for Nebulization.

Rohan Flint^1,2, Daniel R Laucirica², Hak-Kim Chan³

¹School of Biomedical Sciences, The University of Western Australia, Perth, WA 6009, Australia.

|August 26, 2023

Summary

Phage therapy offers a promising alternative for treating lung infections in chronic respiratory diseases. This review explores optimizing phage stability during nebulization for effective delivery to deep lung tissues.

Keywords:

aerosolized delivery antimicrobial resistance bacteriophages nebulization respiratory infections

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Area of Science:

Microbiology
Pulmonology
Biotechnology

Background:

Pulmonary bacterial infections pose risks to individuals with chronic respiratory diseases (CRDs) like cystic fibrosis (CF) and chronic-obstructive pulmonary disease (COPD).
Antimicrobial resistance (AMR) necessitates novel therapeutic strategies beyond conventional antibiotics.
Bacteriophage (phage) therapy is an emerging alternative or adjunct treatment for infections caused by multidrug-resistant pathogens.

Purpose of the Study:

To review current findings on the formulation and stability of liquid phage formulations for nebulized delivery.
To identify factors influencing phage stability during nebulization for respiratory tract infections.
To provide insights for maximizing phage stability and bactericidal efficacy via inhalation therapy.

Main Methods:

Literature review of studies investigating phage therapy for respiratory infections.
Analysis of in vitro and in vivo data on nebulized phage delivery.
Examination of formulation strategies impacting phage viability and stability.

Main Results:

Nebulization is a potential delivery route for phages to deep lung sites.
Phage viability can be compromised during the nebulization process.
Specific formulation characteristics are critical for maintaining phage stability and activity.

Conclusions:

Optimizing phage formulations is essential for successful nebulized phage therapy in CRDs.
Further research is needed to fully characterize and enhance phage stability for inhalation delivery.
Nebulized phage therapy holds promise for combating resistant bacterial lung infections.