Diabetes Drug Holds Promise against Children Brain Tumor

A doctor analyzes the magnetic resonance image (MRI) brain scan
of the head and skull of a person. (Getty Images)
A doctor analyzes the magnetic resonance image (MRI) brain scan of the head and skull of a person. (Getty Images)
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Diabetes Drug Holds Promise against Children Brain Tumor

A doctor analyzes the magnetic resonance image (MRI) brain scan
of the head and skull of a person. (Getty Images)
A doctor analyzes the magnetic resonance image (MRI) brain scan of the head and skull of a person. (Getty Images)

An international research team from the University of Michigan's Health Rogel Cancer Center found that Metformin, a drug commonly prescribed against diabetes, holds promise against a rare type of childhood brain tumor.

Posterior fossa ependymomas -- or PFAs affect neurons in the brain or the spinal cord, and can occur at any age, but often hit young children. Most cancers are known to arise from genetic mutations or errors, but PFAs lack such cancer-driving genetic mutations.

In the study published on October 5 in the journal Science Translational Medicine, the team found that the main reason behind the tumor in the disorder of two metabolic pathways that had been previously associated with DIPGs—glycolysis and the mitochondrial tricarboxylic acid cycle, a series of enzymes-driven chemical reactions that are vital for all living cells that use oxygen for respiration.

Diabetes treatment was an obvious field to turn to when looking for ways to suppress glucose metabolism -- the same process driving the PFA tumors. So, the researchers decided to see how a common diabetes drug, metformin, would affect PFA tumor cells.

"We found that metformin suppressed the cancer cells' metabolism and killed the cells in some PFA ependymoma tumors. And, unexpectedly, we found that metformin actually lowers EZHIP -- the protein that was causing these epigenetic changes in the first place," explained Sriram Venneti, professor at the department of pathology at Michigan Medicine, in a report posted on the university's website.

Meanwhile, when metformin was given to mice carrying patient-derived tumors, it lowered tumor metabolism, shrank the tumors and led to longer survival times in a subset of metformin-sensitive tumors.



'Critically Endangered' African Penguins Just Want Peace and Food

African penguins are now listed as critically endangered - AFP
African penguins are now listed as critically endangered - AFP
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'Critically Endangered' African Penguins Just Want Peace and Food

African penguins are now listed as critically endangered - AFP
African penguins are now listed as critically endangered - AFP

Mashudu Mashau says it takes about two minutes to catch a penguin, a task he does weekly to investigate sightings of injured or sickly seabirds.

"We don't rush... we go down, sometimes we crawl, so that we don't look threatening, and when we're close, we aim for the head, hold it and secure the penguin," the 41-year-old ranger told AFP.

Sometimes, when penguins waddle up from South Africa's coastline onto nearby streets and hide under cars, it is more of a struggle.

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"We had one today. They're not easy to catch because they go from one side to the other side (of the car), but we got it," said Mashau, who has dedicated the past eight years to working to protect the species.

Once caught and placed with care into a cardboard box, the small feathered animals are sent to a specialist hospital for treatment.

But conservationists and veterinarians are worried their efforts aren't sufficient to stop the decline of the African Penguin, listed as critically endangered last month by the International Union for Conservation of Nature (IUCN).

"No matter how much we do, if there isn't a healthy environment for them, our work is in vain," said veterinarian David Roberts, who works at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) hospital.

Fewer than 10,000 breeding pairs are left globally, mainly in South Africa, down from 42,500 in 1991, and they could become extinct in the wild by 2035, the BirdLife NGO says.

- 'Starving' penguins -

The dwindling numbers are due to a combination of factors including a lack of food, climate change, disturbances, predators, disease, oil spills and more.

But the biggest threat is nutrition, says Allison Kock, a marine biologist with the South African National Parks.

"So many of the penguins are starving and are not getting enough food to breed successfully," she told AFP. When penguins do not eat enough, preferably sardines or anchovies, they tend to abandon breeding.

Authorities have imposed a commercial fishing ban around six penguin colonies for 10 years starting in January.

But SANCCOB and BirdLife say the no-fishing zones are not large enough to have a significant impact, and have sued the environment minister over the issue.

"Ideally we would want more fish in the ocean but we cannot control that. What we can ask for, is to limit direct competition for the remaining fish between the industrial fisheries and the penguins," SANCCOB research manager Katta Ludynia told AFP.

The South African Pelagic Fishing Industry Association says the impact of the fishing industry on penguin food sources is just a small fraction.

"There are clearly other factors that have significant negative impact on the population of the African Penguin," chairperson Mike Copeland said.

The environment ministry has proposed a discussion group "to resolve the complex issues", a spokesperson said. While a court hearing is scheduled for March 2025, the minister -- only in the post since July -- has called for an out-of-court settlement.

Apart from the no-fishing zones, many other initiatives are underway to save the African Penguin, including artificial nests and new colonies.

- Tourist traffic -

Being labelled "critically endangered" can be a double-edged sword.

While conservationists are hoping to get attention and funding, it also makes penguins even more attractive to tourists who sometimes disturb them.

"Penguins are very susceptible... and the level of disturbance, people with selfie sticks, it's becoming more and more of a challenge," Arne Purves, coastal conservation and compliance officer for Cape Town, told AFP.

"Especially as the penguins are now even more high-profile."

Tourism is a vital sector for South Africa and each year thousands of people visit the penguin colonies, bringing in millions of dollars in profit.

For those on the frontlines to save the flightless black and white birds, like Mashau, the spotlight has been a long time coming.

"In the last five years, it was the rhinos... we hope we'll get the same respect now and the same assistance," he said.

It is also about protecting the environment. "This is a species that is an indicator of a healthy ecosystem that humans are also part of... and the healthier the penguins, the more humans also benefit," he said.