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Vampire Bacteria? Scientists Uncover Blood-Hunting Behavior in Common Bacteria

April 22, 2024
in Science
Vampire Bacteria? Scientists Uncover Blood-Hunting Behavior in Common Bacteria
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Red Bacteria

Researchers at Washington State University have identified a “bacterial vampirism” where deadly bacteria feed on human blood serum, offering new insights into bloodstream infections and potential treatments for at-risk individuals. (Artist’s concept.) Credit: SciTechDaily.com

Some of the world’s deadliest bacteria seek out and feed on human blood, a newly discovered phenomenon researchers are calling “bacterial vampirism.”

A team led by Washington State University researchers has found the bacteria are attracted to the liquid part of blood, or serum, which contains nutrients the bacteria can use as food. One of the chemicals the bacteria seemed particularly drawn to was serine, an amino acid found in human blood that is also a common ingredient in protein drinks.

The research finding, published in the journal eLife, provides new insights into how bloodstream infections occur and could potentially be treated.

Bacteria Petri Dish

Washington State University researcher Arden Baylink holds a petri dish containing salmonella bacteria. Baylink and PhD student Siena Glenn have published research showing that some of the world’s deadliest bacteria seek out and eat serum, the liquid part of human blood, which contains nutrients the bacteria can use as food. Credit: Ted S. Warren, Washington State University College of Veterinary Medicine

Bacteria Studied and Experimentation

“Bacteria infecting the bloodstream can be lethal,” said Arden Baylink, a professor at WSU’s College of Veterinary Medicine and corresponding author for the research. “We learned some of the bacteria that most commonly cause bloodstream infections actually sense a chemical in human blood and swim toward it.”

Baylink and the lead author on the study, WSU Ph.D. student Siena Glenn, found at least three types of bacteria, Salmonella enterica, Escherichia coli, and Citrobacter koseri, are attracted to human serum. These bacteria are a leading cause of death for people who have inflammatory bowel diseases (IBD), about 1% of the population. These patients often have intestinal bleeding that can be an entry points for the bacteria into the bloodstream.

Siena Glenn

Siena Glenn, a Washington State University Ph.D. student uses a high-powered microscope. Glenn, working with Assistant Professor Arden Baylink and colleagues, has published research showing that some of the world’s deadliest bacteria seek out and eat serum, the liquid part of human blood. Credit: Ted S. Warren, Washington State University College of Veterinary Medicine

Using a high-powered microscope system designed by Baylink called the Chemosensory Injection Rig Assay, the researchers simulated intestinal bleeding by injecting microscopic amounts of human serum and watching as the bacteria navigated toward the source. The response is rapid — it takes less than a minute for the disease-causing bacteria to find the serum.

Potential for New Treatments

As part of the study, the researchers determined Salmonella has a special protein receptor called Tsr that enables bacteria to sense and swim toward serum. Using a technique called protein crystallography, they were able to view the atoms of the protein interacting with serine. The scientists believe serine is one of the chemicals from the blood that the bacteria sense and consume.

“By learning how these bacteria are able to detect sources of blood, in the future we could develop new drugs that block this ability. These medicines could improve the lives and health of people with IBD who are at high risk for bloodstream infections,” Glenn said.

Reference: “Bacterial vampirism mediated through taxis to serum” by Siena J. Glenn, Zealon Gentry-Lear, Michael Shavlik, Michael J. Harms, Thomas J. Asaki and Arden Baylink, 16 April 2024, eLife.
DOI: 10.7554/eLife.93178.2

The study was funded by the National Institute of Allergy and Infectious Diseases.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/vampire-bacteria-scientists-uncover-blood-hunting-behavior-in-common-bacteria/

Tags: BacteriascienceVampire
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