Low-Level ionizing radiation induces selective killing of HIV-1-infected cells with reversal of cytokine induction using mtor inhibitors

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Creator
  • Pinto, D.O.
    • Other Affiliation: George Mason University
  • DeMarino, C.
    • Other Affiliation: George Mason University
  • Vo, T.T.
    • Other Affiliation: George Mason University
  • Cowen, M.
    • Other Affiliation: George Mason University
  • Kim, Y.
    • Other Affiliation: George Mason University
  • Pleet, M.L.
    • Other Affiliation: George Mason University
  • Barclay, R.A.
    • Other Affiliation: George Mason University
  • Noren Hooten, N.
    • Other Affiliation: National Institutes of Health
  • Evans, M.K.
    • Other Affiliation: National Institutes of Health
  • Heredia, A.
    • Other Affiliation: University of Maryland, Baltimore
  • Batrakova, E.V.
    • Affiliation: School of Medicine, Department of Medicine
  • Iordanskiy, S.
    • Other Affiliation: Uniformed Services University of the Health Sciences
  • Kashanchi, F.
    • Other Affiliation: George Mason University
Abstract
  • HIV-1 infects 39.5 million people worldwide, and cART is effective in preventing viral spread by reducing HIV-1 plasma viral loads to undetectable levels. However, viral reservoirs persist by mechanisms, including the inhibition of autophagy by HIV-1 proteins (i.e., Nef and Tat). HIV-1 reservoirs can be targeted by the “shock and kill” strategy, which utilizes latency-reversing agents (LRAs) to activate latent proviruses and immunotarget the virus-producing cells. Yet, limitations include reduced LRA permeability across anatomical barriers and immune hyper-activation. Ionizing radiation (IR) induces effective viral activation across anatomical barriers. Like other LRAs, IR may cause inflammation and modulate the secretion of extracellular vesicles (EVs). We and others have shown that cells may secrete cytokines and viral proteins in EVs and, therefore, LRAs may contribute to inflammatory EVs. In the present study, we mitigated the effects of IR-induced inflammatory EVs (i.e., TNF-α), through the use of mTOR inhibitors (mTORi; Rapamycin and INK128). Further, mTORi were found to enhance the selective killing of HIV-1-infected myeloid and T-cell reservoirs at the exclusion of uninfected cells, potentially via inhibition of viral transcription/translation and induction of autophagy. Collectively, the proposed regimen using cART, IR, and mTORi presents a novel approach allowing for the targeting of viral reservoirs, prevention of immune hyper-activation, and selectively killing latently infected HIV-1 cells.
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  • Article
Rights statement
  • In Copyright
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  • Attribution 3.0 United States
Journal title
  • Viruses
Journal volume
  • 12
Journal issue
  • 8
Language
  • English
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  • Publisher
ISSN
  • 1999-4915
Publisher
  • MDPI AG

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