00:00Scientists found that running low on one amino acid can quietly switch off your immune defenses.
00:06That amino acid is called arginine.
00:08Your body naturally produces it, and it is also found in protein-rich foods.
00:13Researchers at Rockefeller University discovered that low arginine weakens the immune system.
00:19It does this by reducing production of a key molecule called MHC1.
00:25MHC1 acts like a cellular warning signal.
00:27It alerts the immune system to cancer cells and invading viruses.
00:32Without enough MHC1, dangerous cells can escape immune detection.
00:36Here's what happens inside the cell.
00:39When arginine levels drop, ribosomes stall while making MHC1.
00:44Scientists note that six different genetic codons encode arginine.
00:48That highlights its broad importance in protein production.
00:51The team also found 414 proteins at unusually low levels in arginine-depleted cells.
00:58Then they tested a possible solution.
01:00A moderate amount of arginine restored MHC1 gene expression.
01:05The amount was roughly equal to what's found in a couple of over-the-counter tablets.
01:09In mice, arginine-rich diets led to fewer colon tumors.
01:13Mice given arginine after influenza infection also showed better outcomes.
01:17This builds on the team's earlier findings from 2023.
01:21They previously showed that arginine deprivation increased mutations in colon cancer cells.
01:27Arginine levels also naturally decline as people age.
01:30That may help explain why older adults are more vulnerable to infections and cancer.
01:35The research was led by Sohail Tavaze, with Kyushuang Wu as first author.
01:41Researchers say arginine supplements could now be tested alongside immunotherapies.
01:45They may also help protect high-risk people exposed to viral infections.
01:50Arginine is inexpensive, widely available, and the study was published in Cell.
01:56Disclosure.
01:56This video contains stock footage and content created or enhanced using AI-assisted tools.
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