Science & Technology
Scientists grow human brain cells in rats to study diseases
Scientists have transplanted human brain cells into the brains of baby rats, where the cells grew and formed connections.
It’s part of an effort to better study human brain development and diseases affecting this most complex of organs, which makes us who we are but has long been shrouded in mystery.
“Many disorders such as autism and schizophrenia are likely uniquely human” but “the human brain certainly has not been very accessible,” said said Dr. Sergiu Pasca, senior author of a study describing the work, published Wednesday in the journal Nature.
Approaches that don’t involve taking tissue out of the human brain are “promising avenues in trying to tackle these conditions.”
The research builds upon the team’s previous work creating brain “organoids,” tiny structures resembling human organs that have also been made to represent others such as livers, kidneys, prostates, or key parts of them.
To make the brain organoids, Stanford University scientists transformed human skin cells into stem cells and then coaxed them to become several types of brain cells. Those cells then multiplied to form organoids resembling the cerebral cortex, the human brain’s outermost layer, which plays a key role in things like memory, thinking, learning, reasoning and emotions.
Scientists transplanted those organoids into rat pups 2 to 3 days old, a stage when brain connections are still forming. The organoids grew so that they eventually occupied a third of the hemisphere of the rat’s brain where they were implanted. Neurons from the organoids formed working connections with circuits in the brain.
Human neurons have been transplanted in rodents before, but generally in adult animals, usually mice. Pasca, a psychiatry professor at the Stanford School of Medicine, said this is the first time these organoids have been placed into early rat brains, creating “the most advanced human brain circuitry ever built from human skin cells and a demonstration that implanted human neurons can influence an animal’s behavior.”
To examine a practical use of this approach, scientists transplanted organoids into both sides of a rat’s brain: one generated from a healthy person’s cells and another from the cells of a person with Timothy syndrome, a rare genetic condition associated with heart problems and autism spectrum disorder.
Five to six months later, they saw effects of the disease related to the activity of the neurons. There were differences in the two sides’ electrical activity, and the neurons from the person with Timothy syndrome were much smaller and didn’t sprout as many extensions that pick up input from nearby neurons.
Researchers, whose study was funded partly by the National Institutes of Health, said they could do the same sorts of experiments using organoids made from the cells of people with disorders such as autism or schizophrenia — and potentially learn new things about how these conditions affect the brain, too.
Dr. Flora Vaccarino of Yale University – who previously grew lumps containing cerebral cortex that were made with DNA from people with autism – said the study moves the field forward.
Such experiments in animals raise ethical concerns. For example, Pasca said he and his team are cognizant of the rats’ well-being and whether they still behave normally with the organoids inside them, which he says they do. Still, Pasca does not believe this should be tried in primates. Ethicists also wonder about the possibility of brain organoids in the future attaining something like human consciousness, which experts say is extremely unlikely now.
Some scientists are studying human brain organoids outside of animals. For example, researchers at ETH Zurich in Switzerland published a study in Nature earlier this month describing how they are growing brain-like tissue from stem cells in the lab and then mapping the cell types in various brain regions and genes regulating their development. Some are using these structures to study autism.
Science & Technology
UAE sets minimum social media age at 15, mandates age checks
The government said the measures were designed to address concerns over children’s exposure to inappropriate content, unsafe online interactions, excessive social media use and the collection of personal data.
The United Arab Emirates has set a minimum age of 15 for social media use, becoming the first Arab country to introduce such a restriction as governments worldwide seek to address growing concerns over the impact of online platforms on children.
Under a resolution approved on Thursday, children under 15 will be prohibited from creating, using or operating personal social media accounts. The ban means they will not be able to post content, comment, share or join public groups, the government’s media office said, Reuters reported.
Teenagers aged 15 and 16 will be allowed to use social media platforms subject to enhanced safeguards, including age-appropriate content controls, restrictions on interaction with unknown users, screen-time management tools and parental supervision features.
The rules apply to all social media platforms operating in the UAE and require companies to implement robust age-verification measures, including digital identity checks and artificial intelligence-supported technologies. Self-declaration of age will not be accepted as a valid form of verification.
Platforms must also disable accounts created by children under 15, prevent users from circumventing age-verification systems and refrain from using children’s personal data for targeted advertising or behavioural profiling.
The government said the measures were designed to address concerns over children’s exposure to inappropriate content, unsafe online interactions, excessive social media use and the collection of personal data.
Social media companies will have up to 12 months to comply with the new regulations.
The UAE said the framework aligns with international efforts to strengthen online child protection while balancing digital access with safety.
Several countries, including Australia and others in Europe, have moved to tighten restrictions on children’s use of social media amid mounting concerns about its effects on mental health and online safety.
Regional
Iran banks hit by major cyber attack
Officials said a technical investigation confirmed that the disruptions were the result of a cyberattack.
Several major Iranian banks experienced service disruptions on Saturday following a cyberattack, according to the Coordinating Committee of Iran’s state-owned banks.
The outage affected four major financial institutions, including Bank Melli Iran, Bank Saderat Iran, and Bank Tejarat, causing interruptions to mobile and online banking services, automated teller machines (ATMs), point-of-sale (POS) terminals, and some card transactions.
Officials said a technical investigation confirmed that the disruptions were the result of a cyberattack.
The affected banks stated that their technical teams immediately implemented precautionary measures after detecting the incident in an effort to safeguard customer information and protect banking infrastructure.
Qatasi, secretary of the Coordinating Committee of Iran’s state-owned banks, said necessary recovery and repair measures had been carried out.
Authorities said there is currently no evidence that customer data was accessed without authorization, and no data breach has been reported.
Science & Technology
GLP-1 drugs may have a beneficial effect across many types of cancer
The drugs, originally designed to treat diabetes and found to promote weight loss, have also shown benefits for heart risks, sleep apnea and alcohol and substance abuse.
A growing body of evidence suggests that popular GLP-1 drugs, widely used for weight loss and diabetes, can provide protection against many types of cancer, Reuters reported.
More than two dozen studies presented over the past few days at the American Society of Clinical Oncology meeting in Chicago found that patients taking the drugs showed lower risks of developing cancer and disease progression, better survival, and improved responses to some treatments, compared with people who were not taking the GLP-1s.
The studies included analyses of clinical records and real-world databases tracking patients taking Novo Nordisk’s (NOVOb.CO), Wegovy or Ozempic, Eli Lilly’s (LLY.N), Zepbound or Mounjaro, or older GLP-1 treatments.
The studies were not designed to show how or why GLP-1 use might affect cancer treatment. But researchers believe by reducing inflammation, regulating insulin signaling and possibly engaging directly with tumor biology, they may contribute to a protective effect in cancer patients.
“Chronic inflammation is a fundamental biological pathway involved in the development and progression of many cancers,” said Dr. Elizabeth Susan McDonald of the University of Pennsylvania.
McDonald on Tuesday reported on a study of 110,000 women, showing those who took GLP-1 medications were up to 35% less likely to develop breast cancer than those who did not.
While obesity itself is a known risk factor for certain cancers, the anti-inflammatory effects of GLP-1s will likely prove to have a role in cancer prevention, McDonald said.
GLP-1 drugs include semaglutide, the active ingredient in Wegovy, Ozempic and Rybelsus; tirzepatide, sold as Mounjaro and Zepbound, as well as Lilly’s Trulicity, or dulaglutide, and Novo’s older liraglutide, sold as Saxenda and Victoza.
Some of the strongest signals of benefit came from a study of more than 12,000 patients that showed GLP-1 use was associated with markedly lower odds of cancers advancing to metastatic disease, particularly in lung, breast, colorectal and liver cancers.
People with those cancers who took liraglutide, pramlintide, dulaglutide, tirzepatide, lixisenatide, or semaglutide were 38% to 50% less likely to see the disease spread than people who took drugs from a different class of diabetes medicines known as gliptins.
Reduced cancer incidence, longer survival, and fewer metastases were also seen with GLP-1 use in patients with endometrial, bladder and prostate cancers, as well as in those with small intestine neoplasms and blood cancers, multiple studies found.
A separate analysis of patients treated at U.S. community oncology practices found GLP-1 use was associated with significantly better overall survival across six tumor types – breast, prostate, colorectal, lung, liver and kidney – with a roughly one-third reduction in the risk of death.
Researchers also reported that cancer patients receiving immunotherapies such as Merck’s (MRK.N), Keytruda and Bristol Myers Squibb’s (BMY.N), Opdivo or Yervoy appeared to fare better when they were taking GLP-1 drugs, suggesting a possible interaction with the immune system.
GLP-1 users with type 2 diabetes and stage 3 kidney disease had substantially lower mortality and lower rates of several malignancies, particularly lung, colorectal, and hepatocellular cancers, than non-users, read the report.
While GLP-1 medications carry a warning regarding a possible association with a type of thyroid cancer based on rodent studies, researchers say the recent findings point to a potential beneficial class effect across tumor types, rather than benefits confined to a small subset of cancers.
The drugs, originally designed to treat diabetes and found to promote weight loss, have also shown benefits for heart risks, sleep apnea and alcohol and substance abuse.
“These drugs have never been just glucose-lowering agents,” Dr. Marcin Chwistek of the Fox Chase Cancer Center in Philadelphia said at an ASCO press briefing.
Researchers cautioned that nearly all of the data presented were from observational studies, raising the risk of confounding factors. Patients prescribed GLP-1 drugs may differ in important ways, including overall health, access to care and concurrent treatments, that could influence outcomes.
While the various studies tried to account for those differences, none can prove the drugs improve cancer outcomes. Experts said trials in which GLP-1s are added to standard treatment in some cancer patients but not others are needed to establish clear anti-cancer benefits. Some trials are already being planned.
The apparent cancer benefits were not clearly tied to the drugs’ weight-loss effects, suggesting that alone does not explain the findings, Reuters reported.
A seven-year study with nearly 120,000 participants found GLP-1s were associated with lower rates of new prostate cancer diagnoses in high-risk men, compared to drugs such as Merck’s Propecia and GSK’s (GSK.L), Avodart, which are used to shrink enlarged prostate glands.
GLP-1 users had a “very small” reduction in body weight at one year, said Dr. Colton Jones of the University of Texas San Antonio Mays Cancer Center who presented the study at ASCO.
“We hypothesize that both weight loss and a direct anti-cancer effect and anti-inflammatory effect may be driving the associations observed in our study,” Jones said.
ASCO expert Chwistek said anti-inflammatory and immune-modulating properties have long suggested broader effects of GLP-1s.
Referring to one of the largest studies, Chwistek said: “What’s new here is the consistency across tumor types, and data this large and this consistent warrant a prospective randomized trial.”
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