Longevity and mTOR

mTOR is a kinase that functions as one of the central control hubs of every cell, regulating metabolism, cell division, and cell growth. During disease processes, this regulation no longer functions properly—a fact that has made mTOR one of the most intensively studied targets in longevity research.

For centuries, one of humanity's greatest aspirations has been to achieve immortality—or at least a very long life. To move closer to this goal, it is essential to understand the mTOR protein, which scientists have identified as a critical regulator of the aging process.

Table of Contents

1. What Is mTOR?
2. What Activates mTOR?
3. Longevity and mTOR
4. How Can the mTOR Protein Be Inhibited?
5. References

What Is mTOR?

The mTOR kinase can be thought of as the cell's central control hub. It regulates metabolism, cell division, and cell growth. During disease processes, however, this regulation becomes disrupted. In certain situations, inhibiting this control center may prevent cancer cells from continuing to grow. Disorders such as diabetes and obesity are also influenced by mTOR signaling.

A study published in Science Translational Medicine in 2018 attracted considerable attention: Inhibition of mTOR kinase was shown to have beneficial effects on the aging process. These effects included improvements in immune function, resulting in fewer infections. This finding has become particularly relevant in light of the COVID-19 pandemic.

Conversely, dysregulation of mTOR signaling may weaken the immune system, accelerate muscle loss, and contribute to the development and progression of age-related diseases such as diabetes and cognitive decline, including dementia.

Inhibiting mTOR may therefore improve age-related diseases. Experiments in worms, flies, and mice have demonstrated that suppressing mTOR signaling extends lifespan. Consequently, mTOR inhibitors may have the potential to delay aging processes and act as a form of molecular "fountain of youth."

Key finding: In studies involving worms, flies, and mice, inhibition of mTOR consistently extended lifespan.

What Activates mTOR?

A healthy body requires mTOR activation for cell growth and wound healing. mTOR can be activated through protein-rich nutrition and physical exercise. For optimal health, periods of mTOR activation should ideally be followed by periods of mTOR inhibition, for example through intermittent fasting.

During prolonged fasting, the mTOR kinase complex becomes temporarily inactive and detaches from the cell membrane. Pharmacologically, mTOR activity can also be reduced by the immunosuppressive drug rapamycin. According to the 2018 study mentioned above, inhibition—rather than activation—of mTOR appears to exert beneficial effects on aging. These include improved immune function and fewer infections, a finding that gained particular attention during the COVID-19 pandemic.

However, mTOR inhibitors used in oncology to suppress uncontrolled cell growth may cause significant adverse effects. These include metabolic disturbances, hypertension, digestive disorders, and respiratory complications.

Good to know: Because of these potential side effects, using mTOR inhibitors such as rapamycin solely for anti-aging purposes is currently not recommended.

Longevity and mTOR

mTOR inhibitors are not only relevant to anti-aging research but also to many diseases associated with aging. Learn how mTOR interacts with other major metabolic pathways involved in cellular aging in our article on Sirtuins, AMPK and mTOR. mTOR also plays an important role in nutrition, particularly in relation to protein intake and fasting. Learn more in our article Nutrition for Longevity and Gut Diversity.

How Can the mTOR Protein Be Inhibited?

It is already well established that the body possesses natural mechanisms for suppressing mTOR activity. During prolonged fasting, the mTOR kinase complex becomes temporarily inactive and detaches from the cell membrane. Several times each day, mTOR also becomes briefly inactive without leaving its position. Researchers have additionally identified a lipid kinase capable of locally switching off the mTOR complex. This mechanism becomes active, for example, overnight when insulin signaling declines.

One of the most effective natural ways to suppress mTOR is therefore fasting. Additional supportive compounds include melatonin, vitamin D, alpha-lipoic acid, certain polyphenols, and oleocanthal.

Medicine already offers approved mTOR inhibitors, one example being the immunosuppressive drug rapamycin. However, because of its potential side effects, it should not be used solely for anti-aging purposes.

It is important to remember that a healthy body also depends on mTOR activation for tissue growth and wound healing. For optimal health, periods of mTOR activation through protein-rich nutrition and exercise should ideally alternate with periods of mTOR inhibition, such as those induced by intermittent fasting.

References

1. Cassandra Willyard. How Anti-Aging Drugs Could Boost COVID Vaccines in Older People. News Feature. 2020. nature.com/articles/d41586-020-02856-7
2. NeuroCure. New Therapeutic Target – Researchers Discover an "Off Switch" for the mTOR Complex. 2017. neurocure.de
3. Mikhail Blagosklonny. Rapamycin for Longevity: Opinion Article. Research Perspective. 2019. aging-us.com/article/102355