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New York, July 23 Researchers have revealed that a widely used class of drugs to treat patients with hypertension, cardiovascular disease and diabetic kidney disease does not increase the risk of developing a severe Covid-19 infection as previously feared.There have been concerns by the medical community worldwide that the drugs ACE inhibitors and angiotensin receptor blockers (ARB) might have caused an increase in ACE2, the main receptor for SARS-CoV-2, which could possibly increase the risk for this infection and its severity.But the new findings, published in the journal of the American Society of Nephrology, revealed a decrease in ACE2 in mice kidney membranes and no change in lung membranes."This study supports the concept that there is no increased risk for Covid-19 infection by using ACE inhibitors and angiotensin receptor blockers," said study researcher Daniel Batlle from the Northwestern University in the US.For the findings, the research team examined the effect of ACE2 and ARBs in the lungs, which are considered one of the main targets for SARS-CoV-2 entry into the body.ACE inhibitors and ARBs are a category of drugs called RAS blockers.These drugs, by different mechanisms, block the actions of a peptide that causes narrowing of blood vessels and fluid retention by the kidneys, which result in increased blood pressure.The drugs help blood vessels relax and expand and decrease fluid retention, both of which lower blood pressure.To examine this issue, the team measured ACE2 in isolated kidney and lung membranes of mice that were treated with either captopril, a widely used ACE inhibitor, or telmisartan, an ARB also widely prescribed.Since the recognition that ACE2 is the main receptor for SARS-CoV-2, there have been multiple studies discussing the potential risk for susceptibility and worse clinical course of Covid-19 in patients treated with RAS blockers.Much of the speculation comes from previous animal studies where some RAS blockers were reported to upregulate ACE2 in the heart and kidney vasculature."My lab has long worked with ACE2, and this was a critical question that needed to be addressed," Batlle said."We had no bias one way or another, and the kidney findings showing lower ACE2 in treated animals were a bit unexpected," the authors wrote.( With inputs from IANS )

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