RangerJoe
Posts: 13450
Joined: 11/16/2015 From: My Mother, although my Father had some small part. Status: offline
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Blood Pressure Meds Point the Way to Possible COVID-19 Treatment There is little evidence that antihypertensive drugs worsen COVID-19, and scientists are instead exploring the idea that such medications—or their downstream effects—may actually alleviate symptoms. Apr 2, 2020 quote:
Instead of making COVID-19 symptoms worse, some antihypertensive drugs may actually reduce the severity of infections, and could therefore be used to treat the disease, both sets of doctors say. A closer look at the underlying mechanisms of the medications has also buoyed another idea for how to treat COVID-19—give patients the enzyme ACE2 as a decoy to direct SARS-CoV-2 away from their cells. A biotech company developing such an approach using recombinant ACE2 received regulatory approval today (April 2) to start clinical trials on COVID-19 patients. “It’s a very interesting idea,” David Kass, a cardiologist at Johns Hopkins School of Medicine tells The Scientist. “Obviously, if the virus binds to this form of ACE2 that’s floating around in the bloodstream and not attached to a cell, it won’t be able to multiply and damage the cells.” . . . Based on the data, Penninger’s team argued that administering a recombinant ACE2 protein could trick the virus into binding with it, rather than actual ACE2 receptors. This could then protect endogenous receptors and allow them to continue to function in counterbalancing ACE, and, ideally, protect the lung and heart from damage during a viral infection. . . . Using ARBs to combat the virus is a more promising approach. As Penninger’s team showed, SARS-CoV reduced the abundance of ACE2, causing hypertension and lung failure in mice. If ARBs boost ACE2 expression, that might counteract the effects of the infection. The hypothesis is preliminary at this point, says David Gurwitz, a geneticist with a background in pharmacology at Tel Aviv University. He described the idea, which seems paradoxical, March 4 in a review article published in Drug Development Research. The main difference between ACE inhibitors and ARBs is that the former just frees up existing ACE2 receptors, while the latter leads to an increase in the number of receptors, allowing more angiotensin II to be converted to angiotensin 1-7. That would dilate blood vessels and reduce inflammation, countering any hypertensive state caused by a viral infection. In clinical analyses designed to ensure that ARBs don’t harm COVID-19 patients, researchers in China have published preliminary data on medRxiv supporting the hypothesis. In the study, the team tracked the health outcomes of 511 patients taking medications for heart conditions who then became infected with SARS-CoV-2. The patients took either ACE inhibitors, ARBs, or other drugs that lowered their blood pressure. The results showed that patients over age 65 taking ARBs were at a lower risk of developing severe lung damage than age-matched patients not taking the medications, but there weren’t enough data to do a similar analysis for ACE inhibitors. The work reveals there was no hazard for ARBs, and there may be benefits, but as always, more data are needed, Kass says. One way to collect those data on a larger scale, Gurwitz explains, would be to analyze many more COVID-19 patients’ health records to see if they’ve been taking ARBs prior to SARS-CoV-2 infection, then comparing the severity of infection in those patients and how well they recovered with the symptoms of COVID-19 patients not taking the medications. Gurwitz also recommends researchers compare the percentage of people chronically medicated with different antihypertensive medications in the general population with the percentage of them among hospital admissions for COVID-19. These types of analyses could also be done with many other approved drugs, he notes, not just ARBs. https://www.the-scientist.com/news-opinion/blood-pressure-meds-point-the-way-to-possible-covid-19-treatment-67371
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Seek peace but keep your gun handy. I'm not a complete idiot, some parts are missing! “Illegitemus non carborundum est (“Don’t let the bastards grind you down”).” ― Julia Child
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