microbiome tagged posts

Antibody sIgM emerges as a key guardian of gut health and metabolism

Oriol Sunyer pointing to rainbow trout, the fish species used for the reported study.
Oriol Sunyer pointing to rainbow trout, the fish species used for the reported study.
Image: Courtesy of Penn Vet

A pioneering new study published in Nature Microbiology, led by J. Oriol Sunyer, professor of immunology and pathobiology at the School of Veterinary Medicine, and a team of researchers at Penn Vet and the University of New Mexico, has uncovered a surprising new player in gut health: an antibody called secretory immunoglobulin M (sIgM).

While another antibody, secretory immunoglobulin A (sIgA), has long been known for helping balance the bacteria in our intestines, this new research shows that sIgM may be just as vital—if not more so—in protecting gut health and maintaining overall well-being.

Secretory immunoglobulins—immunoglobulins found in the mucosal surfaces ...

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Diet, Microbes and Fat: A new pathway controlling levels of body fat and cholesterol

Diet, microbes and fat: A new pathway controlling levels of body fat and cholesterol
Lipid accumulation in a murine model of fatty liver disease, visualized by color-enhanced lipid droplets (pink) in liver tissue (green). Superimposed chemical structure of a newly discovered bile acid conjugate. Credit: Dr. Mohammad Arifuzzaman, Dr. Christopher Parkhurst, Dr. Frank Schroeder, and Dr. David Artis.

Beneficial gut microbes and the body work together to fine-tune fat metabolism and cholesterol levels, according to a new preclinical study by investigators from Weill Cornell Medicine and the Boyce Thompson Institute at Cornell University’s Ithaca campus.

The research is published in the journal Nature.

The human body has co-evolved with the beneficial microbes that live in the gut (termed the microbiota), resulting in mutually favorable relationships that aid in the d...

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Vitamin D Alters Mouse Gut Bacteria to give Better Cancer Immunity

Bacteroides fragilis
Photomicrograph showing Bacteroides fragilis, which normally lives in the human GI tract.   
Credit: CDC/ Dr. V.R. Dowell, Jr.

Researchers at the Francis Crick Institute, the National Cancer Institute (NCI) of the U.S. National Institutes of Health (NIH) and Aalborg University in Denmark have found that vitamin D encourages the growth of a type of gut bacteria in mice which improves immunity to cancer.

Reported today in Science, the researchers found that mice given a diet rich in vitamin D had better immune resistance to experimentally transplanted cancers and improved responses to immunotherapy treatment. This effect was also seen when gene editing was used to remove a protein that binds to vitamin D in the blood and keeps it away from tissues.

Surprisingly, the team found th...

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Helping ‘Good’ Gut Bacteria and Clearing out the ‘Bad’ – all in one treatment

An illustration of several rod-shaped bacteria.
Probiotic bacteria, like those illustrated here, could one day be delivered to the body on spherical microgels.
Kateryna Kon/Shutterstock.com

Probiotics can help maintain a healthy gut microbiome or restore populations of “good bacteria” after a heavy course of antibiotics. But now, they could also be used as an effective treatment strategy for certain intestinal diseases, such as Crohn’s disease. Researchers reporting in ACS Central Science have developed a microgel delivery system for probiotics that keeps “good” bacteria safe while actively clearing out “bad” ones. In mice, the system treated intestinal inflammation without side effects.

In the digestive system, there’s a delicate balance of bacterial populations...

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