Closer Look
Going on a bear hunt to solve blood clots deadly to us
Courtesy Ole Frøbert
What can hibernating bears teach us about human heart health? A lot, it turns out. Every winter brown bears curl up for months-long snoozes, with no blood-congealing consequences, whereas we humans, when immobilized by injury or infection, risk a potentially fatal blood clot called venous thromboembolism. To figure this out, an army of scientific investigators studied pigs, mice, spinal cord patients, and blood from 10 otherwise healthy people who volunteered to help the European Space Agency simulate a mission to Mars.
And bears. Ultimately, researchers zoomed in on a single protein that all but vanishes from bears' blood when they lie down for winter. That protein, HSP47, is found on platelets, which patch wounds and stop bleeding. The finding, reported yesterday in Science, raises hope that one day researchers might develop drugs to block HSP47, and a new way to treat or prevent clots in immobile patients. STAT's Jason Mast has more.
health
EPA weighs adding more 'forever chemicals' to cleanup list
If you want to be afraid of just about everything in your house, per- and polyfluoroalkyl substances are used in burger wrappers, paper straws, cosmetics, stain-proof carpeting, waterproof cycling gear, and to make nonstick pans, and have toxic effects at low levels. This led the EPA to propose highly restrictive standards for six PFAS in drinking water last month, my colleague Brittany Trang writes.
But another major use of PFAS is in firefighting foams, which might cause trouble for the Department of Defense. Many of its military bases are polluted with PFAS from firefighting foam use, and the EPA yesterday announced it is looking into designating some of the PFAS in those foams and others as "hazardous substances" under the Superfund law, which mandates polluters clean up heavily polluted sites. Last year, the agency proposed this classification for two of the most popular PFAS compounds, PFOS and PFOA, but the new call for public input and data signals the potential for entire groups of the thousands of PFAS compounds to be designated as hazardous.
health
1 in 5 American adults live with chronic pain
It's a staggering number: Just over 50 million adults in the U.S. were living with chronic pain in 2016, a new CDC report says. The survey didn't include nursing home residents, but by 2021, it translated to 1 in 5 Americans enduring pain that lasted three months or more and 1 in 14 having what's called high-impact pain, substantially restricting their daily activities. Studies have linked such pain to depression, Alzheimer's disease and related dementias, higher suicide risk, and substance use and misuse.
Both kinds of chronic pain were more prevalent in older adults, females, those who were unemployed after previously working, veterans, people living in poverty, people not living in metropolitan areas, and people with public health insurance. There were other differences: Non-Hispanic American Indian or Alaska Native adults, adults who identify as bisexual, and adults who were divorced or separated were among the groups who experienced a higher prevalence of pain.
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