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Host antibacterial defense of 6–10 Gy γ-irradiated mice subjected to lentiviral vector-based Gas5 gene therapy

Gene Therapy volume 30, pages 172–179 (2023)Cite this article

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Abstract

Gut bacteria-associated sepsis is a serious concern in patients with gastrointestinal acute radiation syndrome (GIARS). In our previous studies, all mice exposed to 8 Gy of whole body γ-irradiation (8 Gy GIARS-mice) died by sepsis stemming from bacterial translocation. M1Mϕ located in the bacterial translocation site (i.e., the mesenteric lymph nodes, MLNs) have been characterized as major antibacterial effector cells. However, M2bMϕ, inhibitor cells for M1Mϕ polarization, predominated in the MLNs of these mice. The reduced expression of long noncoding RNA Gas5 was associated with M2bMϕ polarization. In this study, we tried to reduce the mortality rate of 8 Gy GIARS-mice through Gas5 gene transduction using lentivirus (Gas5 lentivirus). After Gas5 lentivirus injection, Gas5 RNA was overexpressed in MLN-F4/80+ cells of 8 Gy GIARS-mice, and these cells were identified as non-M2bMϕ. All of the 8 Gy GIARS-mice injected with Gas5 lentivirus survived 30 days or more after irradiation, and bacterial translocation and subsequent sepsis were shown to be minimal in these mice. These results indicate that the antibacterial resistance of 8 Gy GIASR-mice can be restored through the modulation of M2bMϕ located in the bacterial translocation site by Gas5 transduction.

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Fig. 1: Gas5 gene transduction into MLN-F4/80+ cells from 8 Gy GIARS-mice.
Fig. 2: Cellular properties of MLN-F4/80+ cells from 8 Gy GIARS-mice injected with Gas5 lentivirus.
Fig. 3: Bacterial translocation and subsequent sepsis in 8 Gy GIARS-mice injected with NC lentivirus or Gas5 lentivirus.

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Authors and Affiliations

  1. Department of Internal Medicine, The University of Texas Medical Branch, Galveston, TX, USA

    Ichiaki Ito, Makiko Kobayashi & Fujio Suzuki

  2. Department of Radiation Oncology, The University of Texas Medical Branch, Galveston, TX, USA

    Bradford D. Loucas

  3. Department of Biostatistics and Epidemiology, University of North Texas Health Science Center, Fort Worth, TX, USA

    Sumihiro Suzuki

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  1. Ichiaki Ito
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Correspondence to Fujio Suzuki.

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Ito, I., Loucas, B.D., Suzuki, S. et al. Host antibacterial defense of 6–10 Gy γ-irradiated mice subjected to lentiviral vector-based Gas5 gene therapy. Gene Ther 30, 172–179 (2023). https://doi.org/10.1038/s41434-020-00211-z

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