PKC activation by combining TPA with sodium butyrate (T/B) represents the most effective and widely used strategy to induce the Epstein-Barr virus (EBV) lytic cycle. The results obtained in this study show that novel PKCθ is involved in such process and that it acts through the activation of p38 MAPK and autophagy induction. Autophagy, a mechanism of cellular defense in stressful conditions, is manipulated by EBV to enhance viral replication. Besides promoting the EBV lytic cycle, the activation of p38 and autophagy resulted in a pro-survival effect, as indicated by p38 or ATG5 knocking down experiments. However, this pro-survival role was counteracted by a pro-death activity of PKCθ, due to the dephosphorylation of AKT. In conclusion, this study reports, for the first time, that T/B activates a PKCθ-p38 MAPK axis in EBV infected B cells, that promotes the viral lytic cycle and cell survival and dephosphorylates AKT, balancing cell life and cell death.

PKC theta and p38 MAPK activate the EBV lytic cycle through autophagy induction / Gonnella, Roberta; Granato, Marisa; Farina, Antonella; Santarelli, Roberta; Faggioni, Alberto; Cirone, Mara. - In: BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH. - ISSN 0167-4889. - (2015), pp. 1586-1595. [10.1016/j.bbamcr.2015.03.011]

PKC theta and p38 MAPK activate the EBV lytic cycle through autophagy induction

GONNELLA, ROBERTA;GRANATO, Marisa;FARINA, Antonella;SANTARELLI, Roberta;FAGGIONI, Alberto;CIRONE, Mara
2015

Abstract

PKC activation by combining TPA with sodium butyrate (T/B) represents the most effective and widely used strategy to induce the Epstein-Barr virus (EBV) lytic cycle. The results obtained in this study show that novel PKCθ is involved in such process and that it acts through the activation of p38 MAPK and autophagy induction. Autophagy, a mechanism of cellular defense in stressful conditions, is manipulated by EBV to enhance viral replication. Besides promoting the EBV lytic cycle, the activation of p38 and autophagy resulted in a pro-survival effect, as indicated by p38 or ATG5 knocking down experiments. However, this pro-survival role was counteracted by a pro-death activity of PKCθ, due to the dephosphorylation of AKT. In conclusion, this study reports, for the first time, that T/B activates a PKCθ-p38 MAPK axis in EBV infected B cells, that promotes the viral lytic cycle and cell survival and dephosphorylates AKT, balancing cell life and cell death.
2015
Autophagy; EBV; LC3; Lytic cycle; PKCθ; p38 MAPK
01 Pubblicazione su rivista::01a Articolo in rivista
PKC theta and p38 MAPK activate the EBV lytic cycle through autophagy induction / Gonnella, Roberta; Granato, Marisa; Farina, Antonella; Santarelli, Roberta; Faggioni, Alberto; Cirone, Mara. - In: BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH. - ISSN 0167-4889. - (2015), pp. 1586-1595. [10.1016/j.bbamcr.2015.03.011]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/781707
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