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Pain Relief By COVID May Explain About Virus Spread

Researches on the Pain Relief from COVID

Researchers, including one of Indian-origin, have found that SARS-CoV-2, the virus that causes Covid-19, can relieve pain, adding that the finding may explain why nearly half of the people who got Covid-19 experience few or no symptoms.

“It made a lot of sense to me that perhaps the reason for the unrelenting spread of Covid-19 is that in the early stages, you’re walking around all fine as if nothing is wrong because your pain has been suppressed,” said study author Rajesh Khanna from the University of Arizona in the US.

“You have the virus, but you don’t feel bad because your pain is gone. If we can prove that this pain relief is what is causing Covid-19 to spread further, that’s of enormous value,” Khanna added.

In the study, published in the journal PAIN, the research team raised the possibility that pain, as an early symptom of Covid-19, may be reduced by the coronavirus spike protein as it silences the body’s pain signaling pathways.

Viruses infect host cells through protein receptors on cell membranes.

COVID
Researchers, including one of Indian-origin, have found that SARS-CoV-2, the virus that causes Covid-19, can relieve pain, adding that the finding may explain why nearly half of the people who got Covid-19 experience few or no symptoms. Pixabay

Early in the pandemic, scientists established that the SARS-CoV-2 spike protein uses the angiotensin-converting enzyme 2 (ACE2) receptor to enter the body.

But in June, two papers posted on the preprint server bioRxiv pointed to neuropilin-1 as a second receptor for SARS-CoV-2.

“That caught our eye because for the last 15 years my lab has been studying a complex of proteins and pathways that relate to pain processing that are downstream of neuropilin,” said Khanna.

“So we stepped back and realized this could mean that maybe the spike protein is involved in some sort of pain processing,” he added.

According to the researchers, many biological pathways signal the body to feel pain.

One is through a protein named vascular endothelial growth factor-A (VEGF-A), which plays an essential role in blood vessel growth but also has been linked to diseases such as cancer, rheumatoid arthritis, and, most recently, Covid-19.

COVID
In the study, the research team raised the possibility that pain, as an early symptom of Covid-19, may be reduced by the coronavirus spike protein as it silences the body’s pain signaling pathways. Pixabay

Like a key in a lock, when VEGF-A binds to the receptor neuropilin, it initiates a cascade of events resulting in the hyperexcitability of neurons, which leads to pain.

The team found that the SARS-CoV-2 spike protein binds to neuropilin in exactly the same location as VEGF-A.

With that knowledge, they performed a series of experiments in the laboratory and in rodent models to test their hypothesis that the SARS-CoV-2 spike protein acts on the VEGF-A/neuropilin pain pathway.

Also Read: Vaccines Developed Outside India Will Undergo Bridging Studies: Union Health Minister Harsh Vardhan

They used VEGF-A as a trigger to induce neuron excitability, which creates pain, then added the SARS-CoV-2 spike protein.

“Spike completely reversed the VEGF-induced pain signaling. It didn’t matter if we used very high doses of spike or extremely low doses – it reversed the pain completely,” Khanna noted. (IANS)

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