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Overexpression of caspase 1 in apoptosis-resistant astrocytes infected with the BeAn Theiler’s virus

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Abstract

In this study, we demonstrate the upregulation in the expression of caspases 1 and 11 by SJL/J mouse brain astrocytes infected with the BeAn strain of Theiler’s murine encephalomyelitis virus (TMEV). The upregulation of both proteases hints at protection of astrocytic cells from apoptotic death. We therefore looked for the reason of the demonstrated absence of programmed cell death in BeAn-infected SJL/J astrocytes. Complementary RNA (cRNA) from mock- and TMEV-infected cells was hybridized to the whole murine genome U74v2 DNA microarray from Affymetrix. Those experiments demonstrated the upregulation of gene expression for caspases 1 and 11 in infected cells. We further confirmed and validated their messenger RNA (mRNA) increase by reverse transcriptase quantitative real-time PCR (qPCR). The presence of both enzymatically active caspases 1 and 11 was demonstrated in cell lysates using a colorimetric and fluorymetric assay, respectively. We also show that overexpressed caspase 11 activated caspase 1 after preincubation of cytosol in vitro following a time-dependent process. This induction was neutralized by an anti-caspase 11 polyclonal antibody. These results demonstrate the activation of the caspase 1 precursor by caspase 11 and suggest a new mechanism of protection of BeAn-infected astrocytes from apoptosis. The direct experimental evidence that the protection effect demonstrated in this article was mediated by caspase 1, is provided by the fact that its specific inhibitor Z-WEHD-FMK induced de novo apoptotic death.

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Authors and Affiliations

  1. Instituto Cajal. C.S.I.C, Dr. Arce Avenue 37, 28002, Madrid, Spain

    Nazario Rubio

  2. Department of Biology, Universidad Autonoma de Madrid, Madrid, Spain

    Francisco Sanz-Rodriguez

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  1. Nazario Rubio
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  2. Francisco Sanz-Rodriguez
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Correspondence to Nazario Rubio.

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The authors (Nazario Rubio and Francisco Sanz-Rodriguez) declare that they have no conflict of interest.

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Rubio, N., Sanz-Rodriguez, F. Overexpression of caspase 1 in apoptosis-resistant astrocytes infected with the BeAn Theiler’s virus. J. Neurovirol. 22, 316–326 (2016). https://doi.org/10.1007/s13365-015-0400-9

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