Immune system

A new study has shown that the immune cells within the gut could be related to the rate of metabolism. The results of the new study title, “Gut intraepithelial T cells calibrate metabolism and accelerate cardiovascular disease;” are publishes in the latest issue of the journal Nature. The researchers led by Shun He used genetically engineered mice for their study. They noted that when certain immune cells are present in the body, they tend to slow down the metabolism and the ingested nutrients are all converted and stored as fat within the body.

Develop hypertension

On the other hand lack of these immune cells help convert the nutrients into energy. The team used engineered mice which specifically lack these immune cells and found that this made them consume diets rich in sugars, fats, and salts but did not predispose them to develop hypertension, obesity; diabetes and heart disease.

This study could mean that removing these immune cells from the gut could alter the metabolism. Some individuals who are genetically predisposed to having these immune cells thus have a slow metabolism and are so called “thrifty” because they store the nutrients as fat instead of burning them off as energy.

Activity levels

Study co-author Filip Swirski, Associate professor at the Harvard Medical School and a principal investigator at the Center for Systems Biology at the Massachusetts General Hospital explained; “When you eat a meal, your body needs to decide what to do with the energy in the meal. The immune cells calibrate that decision and essentially they put the brakes on a high metabolism.”

The team first began their study looking at a protein called integrin beta7. This protein basically directs the immune cells towards the gut. They note that mice that are engineere to lack the gene coding for this protein ate a lot but did not become obese. Activity levels of these engineered mice were no different from normal mice. Swirski said, “They just run hot They have a higher basal temperature.”

Metabolic syndrome

The team took two groups of mice one group engineered and one group normal. Both were offered a high fat diet that was also high on sugar and salt or sodium. This type of diet normally causes metabolic syndrome with obesity, diabetes, high blood cholesterol, high blood pressure, and heart disease.
They noted that the mice that did not have the integrin beta 7 protein did not become obese and did not develop diabetes or hypertension. All these features are see in the non-engineers mice group. The mice that did not have the protein also did not develop coronary artery disease and atherosclerosis.