Systematic review details metabolic adaptations of intracellular bacterial pathogens within host cellsHow do bacteria hide inside our cells to survive and cause disease?

Frontiers in Medicine Published April 1, 2026 DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Consider metabolic host-pathogen interactions as a potential research avenue for novel therapies.

This systematic review synthesized existing literature on the metabolic strategies of intracellular bacterial pathogens. The analysis focused on species including Listeria monocytogenes, Legionella pneumophila, Shigella flexneri, and Chlamydia trachomatis, examining their adaptations for nutrient acquisition, modulation of host metabolism, and stress-induced metabolic shifts to persist and replicate within host cells. The review found that these pathogens have evolved sophisticated, dynamic strategies to manipulate host metabolic processes in response to environmental stressors.

No specific intervention, comparator, or clinical outcomes were reported, as this was a synthesis of prior research. The main results were descriptive, reviewing metabolic adaptations and analyzing species-specific strategies. No quantitative effect sizes, statistical measures, or absolute numbers were provided.

The review's practice relevance lies in highlighting the potential of targeting host-pathogen metabolic interactions for developing novel interventions, including host-directed therapies. Key limitations include the absence of new experimental data, quantitative analyses, or clinical trial evidence. Safety and tolerability data were not reported. The certainty of the evidence is limited by its nature as a literature synthesis without original quantitative findings.

Some of the most persistent and tricky infections happen when bacteria don't just invade our bodies—they invade our very cells, hiding from our immune system. A new review article pulls together what scientists have learned about how these intracellular pathogens survive. It describes how bacteria like Listeria, Legionella, Shigella, and Chlamydia act like metabolic thieves, stealing nutrients from our cells and even reprogramming our cellular machinery to feed themselves and avoid detection. The analysis suggests that understanding this hijacking could point toward new ways to fight these infections, perhaps by cutting off their food supply or restoring our cells' normal function. It's important to remember this is a summary of existing lab research, not a report on new drugs or clinical trials. The findings are descriptive, mapping out a complex biological battlefield, but they don't provide numbers on how well any potential future treatment might work.

What this means for you:

Bacteria hide in our cells by stealing nutrients, pointing to a new potential way to fight them.

Study Details

Study typeSystematic review

EvidenceLevel 1

PublishedMar 2026

View Original Abstract ↓

Intracellular bacterial pathogens have evolved sophisticated metabolic strategies to persist and replicate within the hostile intracellular environments of their hosts. By leveraging their metabolic plasticity, these pathogens dynamically modulate host metabolic processes in response to immunological, environmental, and pharmacological stressors. This review examines the diverse metabolic adaptations employed by intracellular pathogens, including nutrient acquisition, modulation of host metabolism, and stress-induced metabolic shifts that contribute to persistence and virulence. Emphasis is placed on how distinct intracellular niches- such as vacuoles and the cytosol- shape pathogen metabolism, and how bipartite metabolic strategies enable pathogens to balance energy production with biosynthetic demands. Species-specific adaptations in representative pathogens, including Listeria monocytogenes, Legionella pneumophila, Shigella flexneri, and Chlamydia trachomatis, are analyzed, with a focus on mechanisms of metabolic reprogramming (the alteration of cellular metabolic pathways in response to environmental cues, such as infection or stress, which allows the pathogen to adapt its metabolic state to support survival, replication, and virulence within the host), stress tolerance (refers to a pathogen’s ability to survive and function under harsh environmental conditions, such as oxidative stress, nutrient scarcity, and antimicrobial exposure), and lifecycle transitions (refer to the changes in a pathogen’s developmental or replication stages, such as switching from active growth to a dormant or persistent state during infection). Finally, the review considers how these metabolic strategies intersect with antimicrobial resistance and highlights the potential of targeting host-pathogen metabolic interactions for the development of novel interventions, including host-directed therapies (HDTs).

Systematic review details metabolic adaptations of intracellular bacterial pathogens within host cellsHow do bacteria hide inside our cells to survive and cause disease?

Study Details

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Systematic review details metabolic adaptations of intracellular bacterial pathogens within host cellsHow do bacteria hide inside our cells to survive and cause disease?

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Study Details

Intrawound tobramycin plus vancomycin did not reduce deep infection risk compared with vancomycin alone in high-risk tibial fractures

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Clinical research that matters. Delivered to your inbox.

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