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Belly Fat not All Bad says New Health Study Featured

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belly-fat-stomach-studyBelly fat may not be all bad says a new Loyola University Chicago Stritch School of Medicine study published in the June 6, 2012 issue of PLoS ONE.

Omentum with a Purpose

The omentum is a membrane that lines the abdominal cavity and covers most abdominal organs. It is a repository for fat tissue.Like the appendix, the fatty membrane in the belly called the omentum has never been considered to serve much purpose; until now.

Researchers have found that the omentum appears to play an important role in regulating the immune system. The new finding could lead to new drugs for organ transplant patients and patients with auto-immune diseases such as lupus and Crohn's disease.

"We now have evidence that the omentum is not just fat sitting in the belly," said Makio Iwashima, PhD, corresponding author of a study. Iwashima is an associate professor in the Department of Microbiology and Immunology.

A research team headed by Iwashima and Robert Love, MD, a world renowned lung transplant surgeon, examined the effect that mouse omentum cells had on T lymphocyte cells from a mouse. T cells are the immune system's first line of defense against infection. They identify, attack and destroy bacteria, viruses and other infectious agents.

Normally, T cells multiply in response to an infectious agent, such as an antibody. But when researchers put omentum cells in with activated T cells that had been exposed to antibodies, the T cells did not multiply as they normally would, but instead died. The omentum cells had this effect only on T cells that had been activated. Omentum cells did not have any effect on inactive T cells.

It appears that omentum cells secrete a substance that tamps down the immune system. This discovery could lead to new drugs that would suppress the immune system with fewer side effects than those caused by immune-suppressing drugs now in use. Such drugs could be used, for example, to suppress the immune system in a patient who has received a lung transplant.

In addition to modulating the immune system, the omentum also appears to play a critical role in regenerating damaged tissues, Iwashima said. The omentum contains mesenchymal stem cells that migrate to the site of an injury and help regenerate tissue. Mesenchymal stem cells are cells that have the ability to develop into various types of specialized cells.

In this study, researchers showed that, in tissue-culture flasks, omentum cells can differentiate into lung-type cells as well as bone cells. Iwashima believes the omentum may be the organ specified for tissue healing and regeneration.

The study was supported by the National Institutes of Health and Van Kampen Cardiovascular Research Fund.

Last modified on Thursday, 26 July 2012 06:31
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