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Glutamine Flux Imaging Using Genetically Encoded Sensors
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Glutamine availability regulates cDC subsets in tissue.

Graham P Lobel, Nanumi Han, William A Molina Arocho

    Biorxiv : the Preprint Server for Biology
    |September 30, 2024
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    Tumor cells deplete glutamine, starving critical immune cells. This study shows glutamine deficiency reduces type 1 conventional dendritic cells (cDC1s), hindering anti-tumor immunity and aiding cancer immune evasion.

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    Area of Science:

    • Immunology
    • Cancer Metabolism
    • Cell Biology

    Background:

    • Tumor cells consume glutamine for growth, creating a nutrient-poor microenvironment.
    • The impact of this glutamine deficiency on immune cells, particularly dendritic cells, is not well understood.
    • Conventional dendritic cells (cDCs) are crucial for initiating anti-tumor immune responses.

    Purpose of the Study:

    • To investigate how tumor-induced glutamine deficiency affects conventional dendritic cells (cDCs) in the tumor microenvironment.
    • To determine the specific impact on cDC subsets, especially the immunologically important cDC1 subset.
    • To elucidate the mechanisms by which tumors exploit glutamine metabolism to evade immune surveillance.

    Main Methods:

    • Utilized mouse models of soft tissue sarcomas.
    • Employed glutamine antagonists and genetic/pharmacological inhibition of glutamine utilization.
    • Analyzed the frequency, proliferation, and survival of dendritic cell subsets (cDC1 and cDC2).
    • Investigated the role of the mTOR signaling pathway.

    Main Results:

    • Tumor-associated glutamine deficiency significantly reduces the number and frequency of conventional dendritic cells (cDCs).
    • Type 1 conventional dendritic cells (cDC1s) are particularly sensitive to glutamine deprivation, showing decreased proliferation and survival.
    • Glutamine antagonism did not affect dendritic cell precursor numbers, indicating a specific impact on cDC maturation and maintenance.
    • The nutrient-sensing mTOR pathway appears to be involved in mediating glutamine's effect on cDC1s.

    Conclusions:

    • Tumors co-opt glutamine metabolism to deplete the tumor microenvironment, thereby impairing the function and survival of critical anti-tumor immune cells like cDC1s.
    • This glutamine dependence of cDC1s represents a novel mechanism of tumor immune evasion.
    • Targeting glutamine metabolism holds promise for enhancing anti-tumor immunity and cancer immunotherapy.