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Systematic review examines PI3K/Akt-mTOR pathway role in host defense and pathogen evasionHow do germs outsmart our immune system? A key cellular pathway holds clues

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Key Takeaway
Consider this review as a theoretical framework for research, not as evidence for clinical use.

This systematic review article synthesizes existing research on the molecular composition, activation mechanisms, and regulatory functions of the PI3K/Akt-mTOR signaling pathway in the context of infectious diseases. The review examines the pathway's role in host immune cells—including macrophages, T cells, NK cells, dendritic cells, and B cells—and its manipulation by various pathogens such as bacteria, viruses, parasites, and fungi. No specific patient population, sample size, clinical setting, or intervention was reported, as this is a review of mechanistic and preclinical studies.

The main finding is that the dynamic balance of the PI3K/Akt-mTOR pathway is described as one of the key factors determining infection outcome. The review reports that the host enhances immune defense by activating this pathway, while pathogens achieve immune evasion by targeting key molecules within it. No quantitative effect sizes, absolute numbers, p-values, or confidence intervals were reported for these associations. Safety, tolerability, and adverse event data were not reported, as the review does not include clinical trial data.

Key limitations include the absence of original clinical data, patient population information, and quantitative measures of effect. The review summarizes associations and proposed mechanisms from existing research but makes no causal claims supported by clinical trials. The authors note that this work provides a theoretical framework for subsequent targeted therapeutic research. Its immediate practice relevance is limited to informing basic science understanding rather than guiding clinical decisions, as no efficacy or safety data for any therapeutic intervention are presented.

When you get sick, a hidden tug-of-war plays out inside your cells. Scientists have been piecing together how a specific chain of molecular signals, called the PI3K/Akt-mTOR pathway, acts as a central switch in this fight. The review found that our immune cells—like macrophages and T cells—flip this switch 'on' to mount a stronger defense. But clever bacteria, viruses, and other pathogens have learned to tamper with the same switch, turning it off or manipulating it to evade detection and survive.

Think of this pathway as a master control panel for your immune response. The research suggests that whether an infection takes hold or gets cleared may depend on which side wins control of this panel. It's a dynamic balance. The host tries to activate it for protection, while the invader tries to disrupt it for its own benefit.

This work is a comprehensive summary of existing lab and animal research, weaving together a detailed theory of how this molecular interaction might work. It did not involve patients, measure how well any treatment works, or report on safety. There are no numbers on how much this pathway affects survival rates or recovery times in people.

For now, this review provides a sophisticated roadmap of the cellular battlefield. It describes associations and possible mechanisms, not proven causes from human trials. The main value is giving researchers a clearer theoretical framework to design future experiments for targeted therapies, which are still a long way from the clinic.

What this means for you:
A cellular pathway is a key battleground where our immune system and invading germs fight for control.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedMar 2026
View Original Abstract ↓
The PI3K/Akt-mTOR signaling pathway, as a highly conserved and crucial intracellular signal transduction network, is deeply involved in core biological processes such as cell metabolism, proliferation, survival, and immune responses, playing a pivotal role in the occurrence and development of infectious diseases. This review comprehensively and systematically elaborates on the molecular composition, activation mechanisms, and negative regulatory mechanisms of the pathway, with a particular focus on analyzing its key regulatory role in the anti-infective responses of host immune cells (macrophages, T cells, NK cells, dendritic cells, B cells, etc.), as well as the mechanisms by which pathogens (bacteria, viruses, parasites, fungi, etc.) hijack and interfere with this pathway. Research has shown that the dynamic balance of the PI3K/Akt-mTOR pathway is one of the key factors determining the outcome of infection: the host enhances immune defense by activating this pathway, while pathogens achieve immune evasion by targeting key molecules in the pathway. Furthermore, this review systematically integrates the dual role of the PI3K/Akt-mTOR pathway in infection immunity, aiming to elucidate its central position as a core for host defense and pathogen evasion, and to provide a clear theoretical framework for subsequent targeted therapeutic research.
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