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Coronavirus Doesn’t Directly Targets Taste Buds Cells in Patients: Study

Taste bud cells might not be a target of Covid-19, say researchers

Contrary to the previous findings, which stated that the novel coronavirus directly targets taste buds cells in Covid-19 patients, a new study has now revealed that the loss of the sense of smell and taste linked to inflammation caused by the infection.

“An intriguing early symptom among some Covid-19 patients is the loss of the sense of smell and taste, which has led to the suspicion that the virus that causes the illness, SARS-CoV-2, could be targeting taste buds,” said study authors from the University of Georgia in the US.

“But the initial data from mice suggest that might not be the case,” the authors wrote in a paper published in the journal ACS Pharmacology & Translational Science.

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According to the study, viruses cause infection by invading specific cells in the body and reproducing, often damaging or killing those cells in the process.

Taste bud cells might not be a target of Covid-19
Viruses cause infection by invading specific cells in the body and reproducing, often damaging or killing those cells in the process. Pixabay

Research has shown that SARS-CoV-2 enters human cells through angiotensin-converting enzyme 2 (ACE2), a receptor on the surface of some cells, including those of the human tongue.

For the current findings, the research team wanted to find out whether ACE2 was expressed specifically in taste bud cells, as well as when this receptor first emerges on tongue cells during fetal development, by studying mice as a model organism.

Although the mouse version of ACE2 isn’t susceptible to SARS-CoV-2, studying where it’s expressed in mice could help clarify what happens when people become infected and lose the sense of taste.

By analysing data from oral cells of adult mice, the researchers found that ACE2 was enriched in cells that give the tongue its rough surface, but couldn’t be found in most taste bud cells.

That means the virus probably does not cause taste loss through direct infection of these cells, the researchers said.

Instead, taste buds might be damaged by inflammation caused by the infection.

Taste bud cells might not be a target of Covid-19
The team also showed that other viruses that affect the taste, including the flu virus, might affect different tongue cell types. Pixabay

The team also showed that other viruses that affect the taste, including the flu virus, might affect different tongue cell types.

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Further, the researchers analysed data from oral cells of mice at three developmental stages and found ACE2 in newborn mice but not in fetuses.

Previous studies in humans that were not focused on oral cells suggest ACE2 could be expressed at an early fetal stage and then again at a later stage.

Therefore, the team stated that fetuses could have distinct susceptibilities to SARS-CoV-2 infection at different stages and more work is needed to determine the timing and location of human ACE2 expression. (IANS)

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