Can mito fusion stop Covid-19?
It’s a simple idea:
1. Some coronaviruses fill cells with virions, then manipulate mito morphology to drive apoptosis, thereby liberating virions into intercellular space.
2. Mito fission is required (but not sufficient) for apoptosis.
3. Stearic acid drives mito fusion and may prevent apoptosis, thus slowing down the viral growth rate and giving the body’s immune system time to build up antibodies.
References:
[1] Transmissible Gastroenteritis Coronavirus Induces Programmed Cell Death in Infected Cells through a Caspase-Dependent Pathway
In conclusion, the present study provided evidence that TGEV [a porcine coronavirus] can act as a true apoptotic inducer in cultured cells. The available data point to oxidative stress as a possible trigger for TGEV-induced apoptosis. However, owing to the recognized complexity of this biological process, additional investigations are needed to substantiate this view. An important finding is that TGEV-induced cell death could be efficiently prevented by a caspase inhibitor, consistent with the notion that apoptosis potentially represents a major mechanism in the viral CPE. Accordingly, it would be interesting to examine in vivo whether PCD plays a role in the pathogenesis of TGEV infection. Finally, TGEV is, to our knowledge, the first coronavirus reported to trigger direct apoptosis in infected cells. It would be worth pursuing investigations to determine whether such a property could be shared by other members of this family.
https://www.ncbi.nlm...cles/PMC110052/
[2] Regulation of mitochondrial fission and apoptosis by the mitochondrial outer membrane protein hFis1
Mitochondrial fission is a highly regulated process mediated by a defined set of protein factors and is involved in the early stage of apoptosis.
https://jcs.biologis...ent/118/18/4141
[3] Dietary stearic acid regulates mitochondria in vivo in humans
We show here that C18:0 ingestion rapidly and robustly causes mitochondrial fusion in people within 3 h after ingestion
https://www.ncbi.nlm...les/PMC6081440/
Caveat: Viruses don’t all work the same way. Some drive mitochondria to fission but prevent apoptosis. These might also be slowed down by fusion —
CSFV induced mitochondrial fission and mitophagy to inhibit apoptosis
Classical swine fever virus (CSFV), which causes typical clinical characteristics in piglets, including hemorrhagic syndrome and immunosuppression, is linked to hepatitis C and dengue virus. Oxidative stress and a reduced mitochondrial transmembrane potential are disturbed in CSFV-infected cells. The balance of mitochondrial dynamics is essential for cellular homeostasis. In this study, we offer the first evidence that CSFV induces mitochondrial fission and mitophagy to inhibit host cell apoptosis for persistent infection. The formation of mitophagosomes and decline in mitochondrial mass relevant to mitophagy were detected in CSFV-infected cells. CSFV infection increased the expression and mitochondrial translocation of Pink and Parkin.
https://www.ncbi.nlm...les/PMC5503620/
Viruses that bud off infected cells may not respond to fusion.
Edited by Turnbuckle, 28 March 2020 - 07:31 PM.