The scientists have successfully mapped the aging cells present throughout the human body in a novel and highly comprehensive way that may be used to gain a deeper insight into the biological causes of human aging and development of age-related diseases. Scientists consider this study as a potential tool to develop future therapies that may allow humans to stay healthy for longer periods.
This research was performed by scientists working on a project of National Institutes of Health (NIH). Utilizing the state-of-the-art genetic techniques, researchers analyzed millions of individual cells obtained from various parts of the human body to map the aging cells or senescent cells as they are commonly known.
Senescent cells refer to those cells that stop growing but don't die like normal healthy cells do; rather, they reside inside the body and emit chemicals that may cause inflammation as well as affect nearby healthy cells. According to the scientists, senescent cells accumulate as humans age and may play a role in the development of diseases like arthritis, Alzheimer's disease, heart diseases, diabetes, and some types of cancer.
In order to find out more about this location, scientists studied samples from various organs such as lungs, liver, kidneys, skin, muscles, and blood vessels. Using the method of studying individual cells, they compiled the atlas indicating where the cells responsible for aging in the body are and how they function in different regions.
The study revealed that the cells responsible for aging are different from each other, depending on the organ where they occur; they emit different chemical signals and carry out different functions. While some cells may have positive functions for the body in case of injuries, others can cause inflammation and harm to tissue structures if they remain in the body for a long time.
As the authors of the study believe, this discovery will radically change the approach to aging as a process since, in the future, medical treatments aimed at eliminating harmful cells and preserving beneficial ones will be developed.
Moreover, the study would assist scientists in developing senolytic drugs drugs aimed at elimination of harmful cells. Currently, there are several senolytic drugs under investigation but according to researchers, a cell atlas could improve the effectiveness of such medications.
Furthermore, a better understanding of harmful cell types may enhance research of age-related illnesses. Scientists hope that through the identification of harmful cells which tend to accumulate in particular regions, the reasons for certain people suffering from chronic diseases while others do not become ill in old age can be revealed.
It is possible that the results of the study could help in the development of personalized medicine. Eventually, scientists will be able to identify harmful aging cells in specific patients and suggest treatments based on their unique biology and not only on their age.
While this scientific achievement has been made, researchers have pointed out that there is a need for further studies before these discoveries could be used in practice. Clinical trials are required to determine the safety and effectiveness of therapies targeted at aging cells.
According to scientists, the new atlas has given a very intricate look into the way the process of aging impacts the human body at the cellular level. Scientists have hoped that the knowledge will serve as a valuable resource for researchers all over the world that will help prevent diseases associated with aging.