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Immunotherapeutic effects of recombinant adenovirus encoding interleukin 12 in experimental pulmonary tuberculosis. | LitMetric

Immunotherapeutic effects of recombinant adenovirus encoding interleukin 12 in experimental pulmonary tuberculosis.

Scand J Immunol

Sección de Patología Experimental, Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Mexico City, México.

Published: March 2019

AI Article Synopsis

  • * IL-12 gene expression was examined, revealing a peak at day 14 during granuloma formation, followed by a significant decrease in IL-12 levels as TB advanced, indicating the immune system's diminishing response.
  • * The research also highlights the potential of using adenoviral vectors to deliver recombinant IL-12 (AdIL-12), which showed promising results in reducing bacterial load and preventing infection in healthy mice exposed to infected mice, suggesting that enhancing IL

Article Abstract

High dose of Mycobacterium tuberculosis (Mtb) strain H37Rv administered by intratracheal injection in BALB/c mice induce progressive tuberculosis (TB). In this model, during the first month there is a temporal control of bacillary growth, in coexistence with macrophage activation, granuloma formation and Th-1 response. Then, bacterial proliferation recommences, accompanied by progressive pneumonia and decreasing expression of protective cytokines (IFN-γ and TNF-α). In this model, we studied the IL-12 gene expression kinetics and cellular source. There is a rapid and progressive IL-12 expression peaking at day 14, when granulomas start their formation and numerous macrophages show strong IL-12 immunostaining, while during progressive TB there is a significant decrease of IL-12 expression and occasional macrophages showed IL-12 immunolabeling. In the second part of this study, we determined the immunotherapeutic effect of recombinant adenoviruses that codify IL-12 (AdIL-12). Intratracheal administration of only one dose of AdIL-12 one day before Mtb infection produced significant decrease of bacterial loads, lesser pneumonia and higher expression of TNF-α, IFN-γ and iNOS. When only one dose of AdIL-12 was given in healthy mice cohoused with infected mice with highly virulent and transmissible Mtb, total prevention of infection was conferred. Moreover, when AdIL-12 was administered by intranasal route in animals suffering late active TB after 2 months of infection, a very low pulmonary bacilli burdens was detected. These experimental data confirm that IL-12 is a significant cytokine in the immune protection against Mtb, and gene therapy based in adenoviruses coding this cytokine increased protective immunity and prevent Mtb transmission.

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Source
http://dx.doi.org/10.1111/sji.12743DOI Listing

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