CD8 + Tscm may has protective immunity to hepatitis C virus infection


The dysfunction of memory CD8 + T cell can not be reverted by successful clearance of hepatitis C virus (HCV) after direct-acting antivirals (DAA) therapy, increasing the risk of reinfection with HCV. Stem cell-like memory T cells (Tscm) with superior capacities of long-lasting, self-renewing, and multipotency that contribute to the maintenance of immune function.


We investigated the impact of HCV infection on CD8 + Tscm, and the possible role this compartment may has in disease progression, by using DAA-naïve HCV monoinfected and HIV/HCV coinfected cohorts. The distribution of memory CD8 + T cell subsets and the level of T cell immune activation were determined by flow cytometry. Associations between CD8 + Tscm and other memory T cell subsets, HCV viral load, as well as the level of T cell immune activation were analyzed.


We observed that the proportion of CD8 + Tscm increased in both HCV and HIV/HCV individuals. The proportion of CD8 + Tscm had a positive correlation with that of CD8 + Tcm, and a negative correlation with that of CD8 + Tem, representing the contribution of CD8 + Tscm in T cell homeostasis. In addition, higher frequency of CD8 + Tscm indicated lower HCV viral load and less T cell immune activation in HCV monoinfection, which suggested that CD8 + Tscm may associate with effective control of HCV replication.


CD8 + Tscm may has protective immunity to HCV infection. Considering the characteristics of Tscm, our current study opens new opportunity for Tscm-based vaccine design and immunotherapy development to achieve HCV elimination.

Journal reference:

Lu, X., et al. (2022) CD8+ stem cell-like memory T cell subset is associated with disease progression in chronic hepatitis C virus infection. Europe PMC- Research Square.


The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoLifeSciences.
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