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Rachel V Thomas

Unusually High Cancer-Fighting Immune Cells Could Explain Why Some People Live Beyond 100: Study

Research shows that there are an estimated 300 to 450 living supercentenarians—people aged 110 or older—around the world at any given time. Japan is particularly known for healthy ageing, with an average life expectancy of over 84 years and nearly 100,000 centenarians.

While maintaining a healthy and balanced lifestyle may partly explain their longevity, a new study by a A team of Japanese scientists suggests that it may also be linked to an abundance of cancer-fighting immune cells.

The human immune system has specialized cells called CD4 cytotoxic T lymphocytes (CD4 CTLs), which have been shown to kill tumor cells in some cancers.

When a person gets sick, these cells multiply through a process called clonal expansion to help fight infection.

The study, published in the journal Cell Reports, showed that these immune cells may also play a role in healthy ageing among supercentenarians.

“Immune aging is not simply a process of decline,” said first author Kosuke Hashimoto, an associate professor at the University of Osaka in Japan.

“The selective expansion of certain T cells suggests that, even in extreme old age, the immune system may continue to adapt to age-related challenges,” Hashimoto added.

<h2>How Do Immune Cells Work In Supercentenarians?</h2>

CD4 CTLs are a cellular signature of supercentenarians—people who live to age 110 and beyond. The researchers discovered that these cells expand and adapt within this older population.

“CD4 CTLs are an atypical and relatively rare T cell population,” Hashimoto said. “So, their marked increase in supercentenarians may provide important clues as to how the immune system is maintained in extreme old age.”

The small study analyzed blood samples from 28 adults divided into three age groups:

<ul><li>70–99</li><li>100–109</li><li>110 and older</li></ul>

The findings showed that the proportion of CD4 CTLs increased with age, with median percentages of 4%, 9.6% and 17.6%, respectively.

Researchers found that older adults may be responding to persistent immune threats. As a result, CD4 CTLs clone themselves when the immune system is under attack.

The most prominent clone accounted for an average of 33.3% of CD4 CTLs, indicating that older adults may be responding to persistent immune threats. In one centenarian’s blood sample, a single clone accounted for 53.8% of their CD4 CTLs.

Next, researchers matched the receptor sequences of each participant’s top CD4 CTL clone with those in a public database. Nearly three dozen matches belonged to people with cancer, namely lung, breast and liver cancers.

Because none of the centenarians or supercentenarians studied had been diagnosed with these cancers, researchers theorized that their CD4 CTL expansion may reflect early immune responses.

“Some CD4 CTLs may recognize cancer-related targets, although their exact targets remain unknown,” Hashimoto said.

The study, which focused on T cells circulating in the blood, does not prove that having an abundance of CD4 CTLs prevents cancer or causes a person to live longer.

Hashimoto said the team’s next step is to research how these cells behave in human tissues.

“As we age, abnormal cells, including senescent and cancerous cells, become more common,” Hashimoto said. “Our findings suggest that immune adaptation to these changes may contribute to exceptional longevity.”

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Research shows that there are an estimated 300 to 450 living supercentenarians—people aged 110 or older—around the world at any given time. Japan is particularly known for healthy ageing, with an average life expectancy of over 84 years and nearly 100,000 centenarians.While maintaining a healthy and balanced lifestyle may partly explain their longevity, a new study by a A team of Japanese scientists suggests that it may also be linked to an abundance of cancer-fighting immune cells. The human immune system has specialized cells called CD4 cytotoxic T lymphocytes (CD4 CTLs), which have been shown to kill tumor cells in some cancers.When a person gets sick, these cells multiply through a process called clonal expansion to help fight infection.The study, published in the journal Cell Reports, showed that these immune cells may also play a role in healthy ageing among supercentenarians.“Immune aging is not simply a process of decline,” said first author Kosuke Hashimoto, an associate professor at the University of Osaka in Japan.“The selective expansion of certain T cells suggests that, even in extreme old age, the immune system may continue to adapt to age-related challenges,” Hashimoto added.How Do Immune Cells Work In Supercentenarians?CD4 CTLs are a cellular signature of supercentenarians—people who live to age 110 and beyond. The researchers discovered that these cells expand and adapt within this older population.“CD4 CTLs are an atypical and relatively rare T cell population,” Hashimoto said. “So, their marked increase in supercentenarians may provide important clues as to how the immune system is maintained in extreme old age.”What Did the Study Find?The small study analyzed blood samples from 28 adults divided into three age groups:70–99100–109110 and olderThe findings showed that the proportion of CD4 CTLs increased with age, with median percentages of 4%, 9.6% and 17.6%, respectively.Researchers found that older adults may be responding to persistent immune threats. As a result, CD4 CTLs clone themselves when the immune system is under attack.The most prominent clone accounted for an average of 33.3% of CD4 CTLs, indicating that older adults may be responding to persistent immune threats. In one centenarian’s blood sample, a single clone accounted for 53.8% of their CD4 CTLs.Next, researchers matched the receptor sequences of each participant’s top CD4 CTL clone with those in a public database. Nearly three dozen matches belonged to people with cancer, namely lung, breast and liver cancers.Because none of the centenarians or supercentenarians studied had been diagnosed with these cancers, researchers theorized that their CD4 CTL expansion may reflect early immune responses.“Some CD4 CTLs may recognize cancer-related targets, although their exact targets remain unknown,” Hashimoto said.Evidence Remains PreliminaryThe study, which focused on T cells circulating in the blood, does not prove that having an abundance of CD4 CTLs prevents cancer or causes a person to live longer.Hashimoto said the team’s next step is to research how these cells behave in human tissues.“As we age, abnormal cells, including senescent and cancerous cells, become more common,” Hashimoto said. “Our findings suggest that immune adaptation to these changes may contribute to exceptional longevity.”

unusually high cancer-fighting immune cells could explain why some people live beyond 100: study

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Unusually High Cancer-Fighting Immune Cells Could Explain Why Some People Live Beyond 100: Study

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Unusually High Cancer-Fighting Immune Cells Could Explain Why Some People Live Beyond 100: Study

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