Reactive Oxygen Species Hydrogen Peroxide Mediates Kaposi's
Sarcoma-Associated Herpesvirus Reactivation from Latency
Kaposi's sarcoma-associated herpesvirus (KSHV) establishes a latent
infection in the host following an acute infection. Reactivation from latency
contributes to the development of KSHV-induced malignancies, which include
Kaposi's sarcoma (KS), the most common cancer in untreated AIDS patients,
primary effusion lymphoma and multicentric Castleman's disease. However,
the physiological cues that trigger KSHV reactivation remain unclear. Here, we
show that the reactive oxygen species (ROS) hydrogen peroxide
(H2O2) induces KSHV reactivation from latency through
both autocrine and paracrine signaling. Furthermore, KSHV spontaneous lytic
replication, and KSHV reactivation from latency induced by oxidative stress,
hypoxia, and proinflammatory and proangiogenic cytokines are mediated by
H2O2. Mechanistically, H2O2
induction of KSHV reactivation depends on the activation of mitogen-activated
protein kinase ERK1/2, JNK, and p38 pathways. Significantly,
H2O2 scavengers N-acetyl-L-cysteine (NAC), catalase
and glutathione inhibit KSHV lytic replication in culture. In a mouse model of
KSHV-induced lymphoma, NAC effectively inhibits KSHV lytic replication and
significantly prolongs the lifespan of the mice. These results directly relate
KSHV reactivation to oxidative stress and inflammation, which are physiological
hallmarks of KS patients. The discovery of this novel mechanism of KSHV
reactivation indicates that antioxidants and anti-inflammation drugs could be
promising preventive and therapeutic agents for effectively targeting KSHV
replication and KSHV-related malignancies.
Vyšlo v časopise:
Reactive Oxygen Species Hydrogen Peroxide Mediates Kaposi's
Sarcoma-Associated Herpesvirus Reactivation from Latency. PLoS Pathog 7(5): e32767. doi:10.1371/journal.ppat.1002054
Kategorie:
Research Article
prolekare.web.journal.doi_sk:
https://doi.org/10.1371/journal.ppat.1002054
Souhrn
Kaposi's sarcoma-associated herpesvirus (KSHV) establishes a latent
infection in the host following an acute infection. Reactivation from latency
contributes to the development of KSHV-induced malignancies, which include
Kaposi's sarcoma (KS), the most common cancer in untreated AIDS patients,
primary effusion lymphoma and multicentric Castleman's disease. However,
the physiological cues that trigger KSHV reactivation remain unclear. Here, we
show that the reactive oxygen species (ROS) hydrogen peroxide
(H2O2) induces KSHV reactivation from latency through
both autocrine and paracrine signaling. Furthermore, KSHV spontaneous lytic
replication, and KSHV reactivation from latency induced by oxidative stress,
hypoxia, and proinflammatory and proangiogenic cytokines are mediated by
H2O2. Mechanistically, H2O2
induction of KSHV reactivation depends on the activation of mitogen-activated
protein kinase ERK1/2, JNK, and p38 pathways. Significantly,
H2O2 scavengers N-acetyl-L-cysteine (NAC), catalase
and glutathione inhibit KSHV lytic replication in culture. In a mouse model of
KSHV-induced lymphoma, NAC effectively inhibits KSHV lytic replication and
significantly prolongs the lifespan of the mice. These results directly relate
KSHV reactivation to oxidative stress and inflammation, which are physiological
hallmarks of KS patients. The discovery of this novel mechanism of KSHV
reactivation indicates that antioxidants and anti-inflammation drugs could be
promising preventive and therapeutic agents for effectively targeting KSHV
replication and KSHV-related malignancies.
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