Most of the time, cancer cells do a combination of two things: they overexpress genes that drive tumor growth and they lose normal genes that typically suppress tumors. No two tumors are exactly alike, but some combination of these two effects is usually what results in cancer. Now, for the first time, researchers have shown that it’s possible to treat cancer by delivering a gene that naturally suppresses tumors.
Researchers from Boston Children’s Hospital, Brigham and Women’s Hospital and Memorial Sloan Kettering Cancer Center combined their cancer biology and nanomaterials expertise and developed a therapeutic capable of delivering a tumor suppressor gene known as PTEN, the loss of which can allow tumors to grow unchecked.
In several preclinical models, their PTEN–boosting therapeutic was able to inhibit tumor growth. Their findings were published yesterday in Nature Biomedical Engineering. …
For the first time, scientists have shown that the elasticity of nanoparticles can affect how cells take them up in ways that can significantly improve drug delivery to tumors.
A team of Boston Children’s Hospital researchers led by Marsha A. Moses, PhD, who directs the Vascular Biology Program, created a novel nanolipogel-based drug delivery system that allowed the team to investigate the exclusive role of nanoparticle elasticity on the mechanisms of cell entry.
Retinoblastoma is a rare cancer that originates in the retina, the tissue in the back of the eye that converts light into visual information that is interpreted by the brain.
One retinoblastoma symptom in particular is finding itself in the spotlight. With a rise in social media use in recent years, retinoblastoma has attracted media attention for being a type of cancer that can sometimes be detected through photographs. Across the internet, news stories like this one abound in which friends or relatives have alerted parents to the potential risk of eye cancer after noticing that a child’s pupil appears white instead of red — a symptom called leukocoria — on photos posted to social media.
Fortunately, with proper diagnosis and treatment, 95 percent of children diagnosed with retinoblastoma can be cured. What’s more, a catheter-based treatment approach is now sparing patients from some of the side effects that can be expected from more traditional therapies. …
For a tissue graft to survive in the body — whether it’s a surgical graft or bioengineered tissue — it needs to be nourished by blood vessels, and these vessels must connect with the recipient’s circulation. While scientists know how to generate blood vessels for engineered tissue, efforts to get them to connect with the recipient’s vessels have mostly failed.
“Surgeons will tell you that when putting tissue in a new location in the body, the small blood vessels don’t connect at the new site,” says Juan Melero-Martin, PhD, a researcher in Cardiac Surgery in Boston Children’s Hospital. “If you want to engineer a tissue replacement, you’d better understand how the vessels get connected, because if the vessels go, the graft goes.”
Melero-Martin and colleagues have uncovered several strategies to help these connections form, as they describe online today in Nature Biomedical Engineering. The strategies could help improve the success of such procedures as heart patching, bone grafting, fat transplants and islet transplantation. …
With cancer, it’s generally not the primary tumor that kills people, but metastasis—the spread of cancer to locations far from the original tumor.
Finding ways of stopping metastasis has proven immensely challenging. On some level, it’s a problem with the models that we use to study metastatic cancer. But it’s also a matter of understanding why particular tumor types spread where they do—like prostate tumors to the bones or breast cancer to the brain—and what about the microenvironment—the combination of cells, proteins and other factors—makes different sites in the body metastatically friendly to different tumors.
Randolph Watnick, PhD, and his research team in Boston Children’s Vascular Biology Program have been asking this question, and in the process have found that a protein called prosaposin can make sites unfriendly to metastasis. Interestingly, it’s a protein that some tumors actually make themselves.
But even better, Watnick has found that a tiny fragment of prosaposin—a peptide that is a mere five amino acids long—has the same anti-metastatic power of the full protein, making it highly attractive for drug development. He and his collaborators reported the full story in a recent paper in the journal Cancer Discovery.
In the tale Goldilocks and the Three Bears, Goldilocks tries all of the bears’ porridge, chairs and beds, finding that only the little bear’s things were just right. Everything else was a little off for her…too hot or too cold, too hard or too soft and so on.
Similarly, for everything to work as it should in the body, things need to be just right. Blood pressure shouldn’t be too high or too low; organs can’t be too big or too small, etc.
Donald Ingber, MD, PhD, and his lab in Boston Children’s Vascular Biology Program take this “just right” approach when thinking about how organs and tissues are structured. Recently, he and a member of his research staff, Akiko Mammoto, MD, PhD, discovered that by changing the stiffness of the surrounding tissues—not too loose and not too tight— they could keep blood vessels from leaking. Their finding could have real consequences for people with sepsis or other diseases featuring leaky vessels. …
Grab a garden hose. Put your thumb over the end, but not all the way, and turn the water on. What happens? The water coming out of the hose gets squeezed as it tries to push past your thumb, putting a lot of force on the molecules in the water and making a big spray.
Now do the same thing with an artery: Partially block it with a clot and let blood flow through it. In this case, the force you’ve created in the artery could be lethal—creating fertile ground for blood clots that could lead to a stroke or heart attack.
Omega-3’s are emerging superheroes in the nutrition world. Over two decades ago, scientists noticed that Greenland Eskimos had very low rates of coronary heart disease compared to Western populations. Their secret, it turned out, was eating fish—particularly, fatty fishes like salmon that contain a lot of omega-3 fatty acids.
An avalanche of studies have since demonstrated the cardiovascular health benefits of omega-3 fatty acids, also found in flax seeds and walnuts, as well as suggesting benefits in combating depression, rheumatoid arthritis and some types of cancer, and in boosting cognitive function.
And now comes more evidence that they can prevent blindness. …