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Updated: Jan 29, 2026
Flow Cytometry-based Assay for the Monitoring of NK Cell Functions
Published on: October 30, 2016
mTOR Signaling pathway as a master regulator of memory CD8+ T-cells, Th17, and NK cells development and their
Davood Rostamzadeh1,2, Mehdi Yousefi3,4, Mohammad Reza Haghshenas2
1Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
Abstract:
The mammalian target of rapamycin (mTOR) is a member of the evolutionary phosphatidylinositol kinase-related kinases (PIKKs). mTOR plays a pivotal role in the regulation of diverse aspects of cellular physiology such as body metabolism, cell growth, protein synthesis, cell size, autophagy, and cell differentiation. Immunologically, mTOR has a fundamental part in controlling and shaping diverse functions of innate and adaptive immune cells, in particular, T-cell subsets differentiation, survival, and metabolic reprogramming to ultimately regulate the fate of diverse immune cell types. Researchers report that rapamycin, a selective mTOR inhibitor, and immunosuppressive agent, has surprising immunostimulatory effects on inducing both quantitative and qualitative aspects of virus-specific memory CD8+ T-cells differentiation and homeostasis in a T-cell-intrinsic manner. The mTOR signaling pathway also plays a critical role in dictating the outcome of regulatory T cells (Treg), T helper 17 (Th17) cells, and natural killer (NK) cells proliferation and maturation, as well as the effector functions and cytotoxic properties of NK cells. Manipulation of mTOR activity is a critical therapeutic approach for pharmacological agents that seek to inhibit mTOR. This approach should enhance specific memory CD8 + T-cells responses and induce fully functional effector properties of NK cells to provoke their antitumor and antiviral activities.
Insights
Rapamycin, an mTOR inhibitor, surprisingly boosts virus-specific memory CD8+ T-cells. This manipulation of the mammalian target of rapamycin (mTOR) pathway enhances immune cell functions for therapeutic potential.
Area of Science:
- Immunology
- Cellular Biology
- Pharmacology
Background:
- The mammalian target of rapamycin (mTOR) pathway regulates critical cellular processes including metabolism, growth, and differentiation.
- mTOR signaling is crucial for the function and development of both innate and adaptive immune cells, particularly T-cell subsets.
- Dysregulation of mTOR is implicated in various immune-related disorders.
Purpose of the Study:
- To investigate the immunomodulatory effects of rapamycin, a selective mTOR inhibitor, on immune cell populations.
- To explore the role of mTOR signaling in T-cell differentiation, homeostasis, and the function of natural killer (NK) cells.
- To assess the therapeutic potential of manipulating mTOR activity for enhancing anti-viral and anti-tumor immunity.
Main Methods:
- Utilized rapamycin as a selective inhibitor of the mTOR pathway.
- Analyzed the effects of rapamycin on T-cell subsets, including virus-specific memory CD8+ T-cells.
- Assessed the impact on regulatory T cells (Treg), T helper 17 (Th17) cells, and natural killer (NK) cells proliferation, maturation, and function.
Main Results:
- Rapamycin demonstrated unexpected immunostimulatory effects, enhancing both the quantity and quality of virus-specific memory CD8+ T-cells in a T-cell-intrinsic manner.
- mTOR pathway manipulation influenced the differentiation, survival, and metabolic reprogramming of T-cell subsets.
- The study highlighted mTOR's critical role in Treg and Th17 cell outcomes and NK cell proliferation, maturation, and cytotoxic effector functions.
Conclusions:
- Inhibition of mTOR signaling can lead to enhanced virus-specific memory CD8+ T-cell responses and improved homeostasis.
- Modulating mTOR activity holds therapeutic promise for boosting anti-tumor and anti-viral immunity by enhancing NK cell effector functions.
- Targeting the mTOR pathway represents a viable strategy for developing novel immunotherapies.
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