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Aggravating mechanisms from COVID-19
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DOI：10.1186/s12985-024-02506-8.png)
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Abstract
En 中文
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) induces immune-mediated diseases. The pathophysiology of COVID-19 uses the following three mechanisms: (1) inflammasome activation mechanism; (2) cGAS-STING signaling mechanism; and (3) SAMHD1 tetramerization mechanism, which leads to IFN-I production. Interactions between the host and virus govern induction, resulting in multiorgan impacts. The NLRP3 with cGAS-STING constitutes the primary immune response. The expression of SARS-CoV-2 ORF3a, NSP6, NSP7, and NSP8 blocks innate immune activation and facilitates virus replication by targeting the RIG-I/MDA5, TRIF, and cGAS-STING signaling. SAMHD1 has a target motif for CDK1 to protect virion assembly, threonine 592 to modulate a catalytically active tetramer, and antiviral IFN responses to block retroviral infection. Plastic and allosteric nucleic acid binding of SAMHD1 modulates the antiretroviral activity of SAMHD1. Therefore, inflammasome activation, cGAS-STING signaling, and SAMHD1 tetramerization explain acute kidney injury, hepatic, cardiac, neurological, and gastrointestinal injury of COVID-19. It might be necessary to effectively block the pathological courses of diverse diseases. 1. DNA-driven immune response connects with NLRP3 and controls its inflammasome activity, which leads to IFN-I production via STING. The NLRP3 with cGAS-STING constitutes the primary immune response.2. The expression of SARS-CoV-2 ORF3a, NSP6, NSP7, and NSP8 blocks innate immune activation and facilitates virus replication by targeting the RIG-I/MDA5, TRIF, and cGAS-STING signaling.3. Plastic and allosteric nucleic acid binding of SAMHD1 reduces the magnitude of IFN and induction of virus-specific cytotoxic T cells. SAMHD1-deficient cells detect and activate IFN-I-mediated self ISG gene expression via cGAS-STING.4. SAMHD1 autonomously controls viral infection through innate and adaptive immunity at the level of the infected cell.
Keywords:
CGAS-STING
Inflammasome
NLRP3
SAMHD1
SARS-CoV-2
COVID-19
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