Cited by 65Immune responses and vaccinationsImmune Response and InflammationImmunotherapy and Immune Responses

The Causes and Consequences of Trained Immunity in Myeloid Cells

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Bhargavi, Gunapati, Subbian, Selvakumar·2024·Frontiers in Immunology

Abstract

Conventionally, immunity in humans has been classified as innate and adaptive, with the concept that only the latter type has an immunological memory/recall response against specific antigens or pathogens. Recently, a new concept of trained immunity (a.k.a. innate memory response) has emerged. According to this concept, innate immune cells can exhibit enhanced responsiveness to subsequent challenges, after initial stimulation with antigen/pathogen. Thus, trained immunity enables the innate immune cells to respond robustly and non-specifically through exposure or re-exposure to antigens/infections or vaccines, providing enhanced resistance to unrelated pathogens or reduced infection severity. For example, individuals vaccinated with BCG to protect against tuberculosis were also protected from malaria and SARS-CoV-2 infections. Epigenetic modifications such as histone acetylation and metabolic reprogramming (e.g. shift towards glycolysis) and their inter-linked regulations are the key factors underpinning the immune activation of trained cells. The integrated metabolic and epigenetic rewiring generates sufficient metabolic intermediates, which is crucial to meet the energy demand required to produce proinflammatory and antimicrobial responses by the trained cells. These factors also determine the efficacy and durability of trained immunity. Importantly, the signaling pathways and regulatory molecules of trained immunity can be harnessed as potential targets for developing novel intervention strategies, such as better vaccines and immunotherapies against infectious (e.g., sepsis) and non-infectious (e.g., cancer) diseases. However, aberrant inflammation caused by inappropriate onset of trained immunity can lead to severe autoimmune pathological consequences, (e.g., systemic sclerosis and granulomatosis). In this review, we provide an overview of conventional innate and adaptive immunity and summarize various mechanistic factors associated with the onset and regulation of trained immunity, focusing on immunologic, metabolic, and epigenetic changes in myeloid cells. This review underscores the transformative potential of trained immunity in immunology, paving the way for developing novel therapeutic strategies for various infectious and non-infectious diseases that leverage innate immune memory.

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  • Modulation of transcription factors can influence unintended downstream pathways, leading to alteration of metabolism and/or systemic immune responses.

    “the modulation of transcription factors can influence unintended other downstream pathways, leading to alteration of metabolism and/or systemic immune responses”

    From Targeting Microglial Transcriptional Reprogramming as a Therapy Strategy for Alzheimer's Disease (2026) · cites this paper as [82]

    The ‘Mechanisms underlying enhanced immune responses in trained immunity’ section says SREBPs are transcription factors and that dysregulating their signaling can alter lipid metabolism and inflammatory responses in trained cells. It does not establish that these are unintended downstream effects or that the immune responses are systemic. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Bhargavi, G., & Subbian, S.
Affiliations
Rutgers, The State University of New Jersey (US)
Corresponding author
Subbian, Selvakumar
Venue
Frontiers in Immunology
Published
2024-04-11
Volume
15
Pages
1365127-1365127
ISSN
1664-3224 (ISSN-L)
OpenAlex
W4394723331
Cited by
62
References
148
Citations by year
2026: 28 · 2025: 29 · 2024: 5
FWCI
2.74
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Immunology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
Office of Extramural Research, National Institutes of Health
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune responses and vaccinations
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
trained immunity, myeloid cells, epigenetic modifications, histone acetylation, metabolic reprogramming, glycolysis, BCG vaccination, cross-protection, innate and adaptive immunity, vaccine development, immunotherapy, sepsis, autoimmune disease, systemic sclerosis, granulomatosis
MeSH terms
COVID-19, SARS-CoV-2, Trained Immunity, Animals, Humans, Immunity, Innate, Immunologic Memory, Myeloid Cells, Epigenesis, Genetic

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