Health
Aging ‘hotspot’ found in brain, researchers say: ‘Major changes’
The brain plays a big part in the aging process, and scientists think they’ve pinpointed the specific cells that control it.
In a study of mice, researchers at the Allen Institute identified certain cells that showed “major changes” with age, particularly in one specific “hotspot,” according to a press release.
Mice were chosen because their brains share “many similarities” to human brains.
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“Our brain consists of thousands of types of cells, which carry out different functions,” Hongkui Zeng, study co-author and director of the Allen Institute for Brain Science in Seattle, told Fox News Digital. “Our study shows that different cell types are differentially susceptible to the aging process.”
The research, funded by the National Institutes of Health, was published in the journal Nature.
Scientists from the Allen Institute believe they have pinpointed the specific brain cells that control aging. (iStock)
The researchers used RNA sequencing and brain-mapping tools to analyze more than 1.2 million brain cells from young mice (2 months old) and older mice (18 months old).
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The 18-month-old mice are roughly equivalent to a “late middle-aged human,” the researchers indicated.
The researchers grouped the cells into 847 different types and also identified nearly 2,500 genes that changed with aging, according to Zeng.
Mice (not pictured) were chosen because their brains share “many similarities” to human brains, the researchers said. (iStock)
The cells that were linked to aging showed an increase in inflammation and a decrease in “neuronal function.”
“Changes in these genes point to deteriorated neuronal structure and function in many neuronal and glial cell types, as well as increased immune response and inflammation in the brain’s immune and vascular (blood vessel) cell types,” Zeng detailed.
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The cells that experienced the biggest changes were the ones in the hypothalamus, the part of the brain that is linked to food intake, energy balance and metabolism, the researchers noted.
This suggests that this area is a “hotspot for aging,” Zeng noted, and that there could be a connection between diet, lifestyle factors, brain aging and risk of age-related cognitive disorders.
“Aging is the most important risk factor for many brain diseases.”
“The findings from the study reinforce the notion that maintaining a healthy lifestyle, promoting a healthy metabolic state, and reducing inflammation in the body and brain could slow down or delay the aging process and reduce the risks of aging-associated brain diseases,” he said.
The hope is that this discovery could lead to new age-related therapies to improve the function of these cells and help prevent neurodegenerative diseases, according to the researchers.
Researchers from the study discuss findings at the Allen Institute. (Allen Institute)
“Aging is the most important risk factor for many brain diseases,” Zeng noted.
“Our study provides a highly detailed genetic map for which brain cell types may be most affected by aging and suggests new gene and cell targets for developing new treatments for aging-related brain diseases.”
The study did have some limitations, the authors acknowledged.
“The main limitation of our study is that the findings are correlational,” Zeng said.
Inflammation plays a role in chronic age-related diseases such as Alzheimer’s, a neurologist noted. (AP Photo/Evan Vucci, File)
“We don’t know yet if the gene expression changes observed in specific cell types are causal to brain aging. Our study lays the groundwork by providing a detailed genetic map and cell targets.”
Zeng called for future studies to investigate the cells’ roles in aging and determine whether the reversal of the changes could delay the aging process.
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Dr. Earnest Lee Murray, a board-certified neurologist at Jackson-Madison County General Hospital in Jackson, Tennessee, commented that the new research adds to existing evidence supporting the role of diet in human brain health.
The detailed “brain roadmap” will be very beneficial for future research into aging and possible therapeutics, according to Murray, who was not involved in the study.
The detailed “brain roadmap” discovered in the study will be very beneficial for future research into aging and possible therapeutics, experts agree. (iStock)
It’s been known for some time that inflammation plays a role in chronic age-related diseases such as Alzheimer’s, the neurologist noted.
“More and more evidence is pointing to the fact many chronic diseases can be prevented, and it often comes down to diet and exercise,” he told Fox News Digital.
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“Altering diet to exclude processed foods and initiating some habits such as intermittent fasting have been shown to reduce this cellular inflammation that appears to be leading to so many diseases.”
Health
Scientists pinpoint why COVID vaccine may trigger heart inflammation in certain people
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SCREENING DEBATE — A new study questions whether annual mammograms are necessary for most women
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Health
Aging-related joint disorder increasingly affects people under 40, study finds
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Cases of gout are rising in younger individuals, according to a global study.
The condition, which is a type of inflammatory arthritis, steadily increased in people aged 15 to 39 between 1990 and 2021, researchers in China announced.
Although rates vary widely between countries, the total number of young people with the condition is expected to continue rising through 2035.
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The study, published in the journal Joint Bone Spine, investigated 2021 data from the Global Burden of Disease (GBD), spanning 204 countries within the 30-year timeframe.
The data measured gout prevalence, incidence and years lived with disability, tracking global trends over time. The results showed a global increase across all three outcomes.
Gout is expected to continue rising in young people through 2035. (iStock)
Prevalence and disability years increased by 66%, and incidence rose by 62%. In 2021, 15- to 39-year-olds accounted for nearly 14% of new gout cases globally, the study found.
Men from 35 to 39 years old and people in high-income regions had the highest burden, but high-income North America topped the list for highest rates.
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Men were also found to have lived more years with gout due to high BMI, while women tended to have the condition as a link to kidney dysfunction, the study noted.
The total number of cases is expected to increase globally due to population growth, but the study projected that rates per population would decrease.
The researchers noted that data quality, especially in low-income settings, could have posed a limitation to the broad GBD data.
What is gout?
Gout is a common form of arthritis involving sudden and severe attacks of pain, swelling, redness and tenderness in the joints, according to Mayo Clinic. It most often occurs in the big toe.
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The condition occurs when urate crystals accumulate in the joint. These form when there are high levels of uric acid in the blood, which the body produces when it breaks down a natural substance called purines.
A gout flare-up can happen at any time, often at night, causing the affected joint to feel hot, swollen, tender and sensitive to the touch.
Urate crystals, described as sharp and needle-like, build up in the joint, causing intense pain and swelling. (iStock)
Purines can also be found in certain foods, like red meat or organ meats like liver and some seafood, including anchovies, sardines, mussels, scallops, trout and tuna, according to the Mayo Clinic. Alcoholic drinks, especially beer, and drinks sweetened with fruit sugar can also lead to higher uric acid levels.
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Uric acid will typically dissolve in the blood and pass through the kidneys into urine, but when the body produces too much or too little uric acid, it can cause a build-up of urate crystals. These are described by the Mayo Clinic as sharp and needle-like, causing pain, inflammation and swelling in the joint or surrounding tissue.
Risk factors for gout include a diet rich in high-purine foods and being overweight, which causes the body to produce more uric acid and the kidneys to have trouble eliminating it.
Experts urge patients to seek medical attention for gout flare-ups. (iStock)
Certain conditions like untreated high blood pressure, diabetes, obesity, metabolic syndrome and heart and kidney diseases can increase the risk of gout, as well as certain medications.
A family history of gout can also increase risk. Men are more likely to develop the condition, as women tend to have lower uric acid levels, although symptoms generally develop after menopause.
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Untreated gout can cause worsening pain and joint damage, experts caution. It may also lead to more severe conditions, such as recurrent gout, advanced gout and kidney stones.
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The Mayo Clinic advises patients to seek immediate medical care if a fever occurs or if a joint becomes hot and inflamed, which is a sign of infection. Certain anti-inflammatory medications can help treat gout flares and complications.
Fox News Digital reached out to the researchers for comment.
Health
New study questions whether annual mammograms are necessary for most women
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A new study suggests that annual mammograms may not be the only effective approach for preventing breast cancer.
The research, published in the Journal of the American Medical Association (JAMA), tested a risk-based breast cancer screening approach against standard annual mammography.
The WISDOM randomized clinical trial, led by study authors from universities and healthcare systems across the U.S., considered more than 28,000 women aged 40 to 74 years old, splitting them into a risk-based screening group and an annual mammography group.
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Researchers calculated each woman’s individual risk based on genetics (sequencing of nine breast cancer genes) and other health factors.
A new study suggests that annual mammograms may not be the only effective approach for preventing breast cancer. (iStock)
Those who were at the highest risk were advised to alternate between a mammogram and an MRI scan every six months. Patients with elevated risk were told to get an annual mammography and counseling.
Average-risk women were guided to get mammograms every two years, while low-risk individuals were advised to have no screening until they became higher risk or reached age 50.
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The researchers found that risk-based screening did not lead to more advanced cancer diagnoses (stage 2B or higher) compared with annual screening, indicating that it is just as safe as traditional methods. The risk-based approach, however, did not reduce the number of biopsies overall, as researchers had hoped.
Among the risk-based group of women, those with higher risk had more screening, biopsies and detected cancers. Women at lower risk had fewer procedures.
The research, published in the Journal of the American Medical Association (JAMA), tested a risk-based breast cancer screening approach against standard annual mammography. (iStock)
“[The] findings suggest that risk-based breast cancer screening is a safe alternative to annual screening for women aged 40 to 74 years,” the researchers noted in the research summary. “Screening intensity matched individual risk, potentially reducing unnecessary imaging.”
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Fox News medical contributor Dr. Nicole Saphier, associate professor of radiology at Memorial Sloan Kettering Cancer Center in New Jersey, commented that while these findings are important, the study “completely sidelines” what screenings are designed to do — detect cancer early.
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“If you don’t measure stage 0, stage 1 or stage 2A cancers, you can’t tell whether personalized screening delays diagnosis in a way that matters for survival and treatment intensity,” Saphier, who was not involved in the study, told Fox News Digital in an interview.
Those who were at the highest risk were advised to alternate between a mammogram and an MRI scan every six months. (iStock)
More than 60% of breast cancers in the U.S. are diagnosed at stage 1 or 2A, where cure rates exceed 90%, the doctor noted.
The trial doesn’t “fully evaluate” whether risk-based screening changes detection at the earliest and most treatable stages, where screening “delivers its greatest benefit,” according to Saphier.
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“Mammography is not without risk — radiation exposure, false positives, anxiety and potential over-diagnosis are real and should be acknowledged,” she said. “But it remains the most effective, evidence-based tool for detecting breast cancer early, when treatment is most successful.”
The expert added that labeling women under 50 as “low risk” is “outdated,” as breast cancer diagnoses are on the rise in younger females.
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“Until long-term mortality data support alternative approaches, annual screening beginning at 40 for average risk women should continue,” Saphier added. “Women should be assessed for breast cancer risk by 25 years old to determine if screening should begin earlier.”
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