Maybe there is another way to block this virus from infecting the host cells.
Studies are finding that the way this virus infects the body is through the following process:
Cell entry of 2019-nCov depends on binding of the viral spike proteins to cellular receptors ACE2 and on S protein priming by
host cell protease TMPRSS2 . A TMPRSS2 inhibitor approved for clinical use blocked entry of 2019-nCov.
https://www.ncbi.nlm...pubmed/32142651
So my understanding of this process is that the 2019-nCov uses its viral spike to attach to the ACE2 receptors and then the
virus uses the cell protease TMPRSS2 to prime itself so it can enter the host cell and start to replicate. A TMPRSS2 inhibitor
stops this process from happening causing the virus to be unable to enter the cell and replicate.
But an issue with ACE2 is that....."ACE2 did not show a high or specific expression in the lung, which is the major infected tissue in
the human body by this virus. It remains unclear why the lung is mainly infected, but not other tissues among which ACE2 is highly
expressed. We hypothesized that there could be some other gene playing key roles in the entry of 2019-nCoV into human cells."
So they are saying that the lung is the primary organ infected by this virus, but the lungs do not show a high or specific expression of ACE2,
And that tissues that do have a high expression of ACE2 are not being infected by the virus like the lungs are. So there must be something
special to the lungs that this virus is using.
Well, researchers found that "AGTR2 (angiotensin II receptor type 2), a G-protein coupled receptor, has interaction with ACE2 and is highly
expressed in the lung with a high tissue specificity. More importantly, simulation of 3D structure based protein-protein interaction reveals that
AGTR2 shows a higher binding affinity with the spike protein of 2019-nCov than ACE2 (energy score: -15.7 vs. -6.9 [kcal/mol])"
So then based upon the research we need to find something that can inhibit AGTR2 and also inhibit TMPRSS2 to cover all angles. And there
is actually a substance that can inhibit both of those.
The herb Andrographis
In reference to AGTR2:
"Through screening CMap and JMap, we identified the potential agents to decrease the expression level of AGTR2. A number of agents that
decreased the expression of AGTR2 included Urtica, Andrographis, lipopolysaccharide."
In reference to TMPRSS2:
"Studies have shown that inhibiting the enzyme activity of TMPRSS2 can prevent coronaviruses from entering host cells. As a possible target
for anti-viral drug discovery, the virtual screen results predicted many anti-bacterial drugs (pivampicillin, hetacillin, cefoperazone and clindamycin)
and anti-virus natural compounds (phyllaemblicin G7, neoandrographolide, kouitchenside I), etc. to be potential TMPRSS2 inhibitors."
Neonandrographolide is a compound of the andrographis herb.
Also there is some belief that Chloroquine works by raising the pH of the endosomes since a virus can not seem to replicates in that type of enviroment. Andrographis has been found to also raise pH to prevent virus from replicating:
https://www.ncbi.nlm...les/PMC6186950/
In addition to those benefits, Andrographis also appears to inhibit the cytokine IL-6 which was found to cause significant damage to the lungs in the
2019-nCov virus.
https://www.ncbi.nlm...pubmed/21442031
Edited by lancebr, 25 March 2020 - 08:23 PM.