Topic: Biology

Scientists at City of Hope have found that a new type of stem cell is responsible for belly fat accumulation as we age. This discovery could lead to new strategies for reducing abdominal fat and promoting healthier aging.

As people get older, many notice their waistline expanding, even when overall body weight doesn't change much. This increase in abdominal fat is more than just a cosmetic concern. Excess belly fat has been linked to slower metabolism, accelerated aging, type 2 diabetes, heart disease, and other chronic health problems.

Scientists have long known that body composition changes with age, but exactly why fat tends to accumulate around the midsection has remained unclear. Now, researchers at City of Hope have identified what may be a key biological driver of age-related belly fat.

Their findings, published in the journal Science, point to a newly identified type of stem cell that appears during aging and may help fuel the production of new fat cells. The discovery could eventually lead to new strategies for reducing abdominal fat and promoting healthier aging.

The research team worked with scientists at UCLA and conducted a series of experiments in mice that were later supported by studies of human cells. Their investigation focused on white adipose tissue (WAT), the body's primary fat-storage tissue.

To understand what was happening at a molecular level, the researchers used single-cell RNA sequencing, a technique that allows scientists to examine gene activity in individual cells. The analysis revealed that APCs were relatively quiet in young mice. In middle-aged mice, however, these cells became highly active and began producing large numbers of new fat cells.

The scientists found that aging did more than simply activate APCs. As mice reached middle age, some APCs transformed into a newly identified stem cell.

Why It Matters

This discovery could lead to new strategies for reducing abdominal fat and promoting healthier aging, which is especially important in India where obesity and related health issues are on the rise.

Key Facts

• Excess belly fat has been linked to slower metabolism, accelerated aging, type 2 diabetes, heart disease, and other chronic health problems.
• The new type of stem cell appears during aging and may help fuel the production of new fat cells.
• Researchers found that APCs in middle-aged mice exhibited high adipogenic capacity cell-autonomously.

Key Terms

APCs

Adipocyte progenitor cells, a type of stem cell found within fat tissue.

Implications

This discovery could lead to new strategies for reducing abdominal fat and promoting healthier aging, which is especially important in India where obesity and related health issues are on the rise.