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Inhibition of the lncRNA SAF drives activation of apoptotic effector caspases in HIV-1–infected human macrophages
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Inhibition of the lncRNA SAF drives activation of apoptotic effector caspases in HIV-1–infected human macrophages
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Inhibition of the lncRNA SAF drives activation of apoptotic effector caspases in HIV-1–infected human macrophages
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Journal Article
Inhibition of the lncRNA SAF drives activation of apoptotic effector caspases in HIV-1–infected human macrophages
2019
Overview
Long noncoding RNAs (lncRNAs) impart significant regulatory functions in a diverse array of biological pathways and manipulation of these RNAs provides an important avenue to modulate such pathways, particularly in disease. Our knowledge about lncRNAs’ role in determination of cellular fate during HIV-1 infection remains sparse. Here, we have identified the impact of the lncRNA SAF in regulating apoptotic effector caspases in macrophages, a long-lived cellular reservoir of HIV-1, that are largely immune to virus-induced cell death. Expression of SAF is significantly up-regulated in HIV-1–infected human monocyte-derived macrophages (MDM) compared with bystander and virus-nonexposed cells. A similar enhancement in SAF RNA expression is also detected in the HIV-1–infected airway macrophages obtained by bronchoalveolar lavage of HIV-1–infected individuals. Down-regulation of SAF with siRNA treatment increases caspase-3/7 activity levels in virus-infected MDMs. This induction of apoptotic caspases occurs exclusively in HIV-1–infected macrophages and not in bystander cells, leading to a significant reduction in HIV-1 replication and overall viral burden in the macrophage culture. This study identifies targeting of the lncRNA SAF as a potential means to specifically induce cell death in HIV-1–infected macrophages.
Publisher
National Academy of Sciences
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