Body-made compound may help regulate inflammation in older adults

Researchers have found that taurine, a naturally occurring compound in the body, appears to help keep a key inflammatory switch under control. The result may point to new ways of studying the chronic inflammation often associated with aging.

A Yale-led team reports that what happens to taurine inside immune cells may matter more than simply whether blood levels are low. When these cells lose taurine, a chain of events can trigger an inflammatory response.

Published in Cell, the study combined human samples with experiments in cells and mice. It identifies a possible target for treatment, but it does not prove that taurine supplements can prevent age-related disease or lengthen human lifespan.

Low-grade inflammation can continue long after the body’s defensive response is no longer needed. Over time, that lingering activity has been linked to poorer health and declining function, making it a major topic in aging research.

The group, led by Vishwa Deep Dixit, became interested in taurine after studying people who modestly cut their calorie intake. During that work, taurine levels increased along with changes associated with reduced inflammation.

The scientists then tested whether older adults would have less taurine. Comparing blood samples from people ages 20 to 40 with those from people ages 60 to 99 showed the opposite: the older group had higher circulating levels.

That finding suggested blood taurine is not a simple marker of aging. Instead, the researchers focused on macrophages, immune cells that detect threats and help coordinate the body’s first response to injury or infection.

Within these cells is the inflammation-triggering complex known as the NLRP3 inflammasome. It works like an alarm system, gathering several proteins to launch a defensive response when danger is detected.

When macrophages were exposed to different danger signals, they released as much as 80% of their taurine. Replacing taurine inside the cells blocked later inflammatory responses, while lowering its availability made the alarm easier to set off.

Studies in aged mice also connected extra taurine with better function and protection against certain severe inflammatory challenges. These results help link the cell-level mechanism to effects in a living organism, although they remain preclinical evidence.

The work also raises new questions about where taurine goes after leaving a macrophage and how its movement might be controlled. Higher amounts in the bloodstream are not necessarily the same as maintaining the right level inside the cells that need it.

For human health, the main advance is a clearer explanation of how immune cells detect disruption. Whether this mechanism can be safely adjusted in older adults will take more research before taurine-based approaches can be considered treatments for age-related inflammation.

If you are interested in this topic, please read articles about 8 natural ways to reduce inflammation, and How turmeric can help fight inflammation.

For more information, please see articles about Vitamin D supplements may slow biological aging by protecting telomeres, and Vitamin C intake may help slow down aging.

Source: Yale University.