Fitness
Could cancer immunotherapy success depend on gut bacteria?
Gut bacteria can penetrate tumor cells and boost the effectiveness of an experimental immunotherapy that targets the CD47 protein.

Could the response to cancer immunotherapy depend on bacteria that originate in the gut and travel to the tumor?
A study by researchers at UT Southwestern Medical Center and the University of Chicago suggests exactly that, revealing that gut bacteria can penetrate tumor cells and boost the effectiveness of an experimental immunotherapy that targets the CD47 protein.
Using mouse models of malignancy, the scientists found that the intestinal microbe Bifidobacterium accumulates within tumors, transforming anti-CD47 unresponsive tumors into responsive ones.
The team’s study, published today in the Journal of Experimental Medicine, discovered that the response to treatment depends on the type of bacteria living in the animals’ guts. They then identified the mechanism, finding that the combination of antibodies against CD47 and gut bacteria works via the body’s STING pathway of innate immunity – the body’s first line of defense against infection.
Their experiments used mice from different resource facilities, antibiotic-fed mice, and mice raised in a germ-free environment.
In one experiment, they studied mice raised in two different facilities and that had distinct mixtures of bacteria in their intestines. One group was responsive to anti-CD47 and another was not. The second group became responsive, however, after being housed with the responders, indicating that oral transfer or contact transmission of gut bacteria occurred between groups, the researchers say.
The protein CD47 is expressed in high levels on the surface of many cancer cells, where it acts as a “don’t eat me” signal to the immune system’s macrophages, commonly known as white blood cells. As a result, anti-CD47, also known as CD47 blockade therapy, is currently under investigation in multiple clinical trials. However, the mouse studies that predated those trials had mixed results, with only some mice responding to the anti-CD47 therapy, explains corresponding author Yang-Xin Fu, M.D., Ph.D., professor of pathology, immunology, and radiation at UT Southwestern.
“We felt we needed to improve anti-CD47 therapy and understand the mechanisms,” he says, leading them to wonder about the gut microbiome, the bacteria that grow in the intestines and aid with digestion. That bacterial ecosystem, sometimes called the microbiota, is also known to affect the gut’s ability to resist pathogens and the host’s response to cancer immunotherapy.
“But how the microbiota does that has been unclear,” Fu says. “This study finds that some of the bacteria from the gut travel to the tumor and get into the cells, or microenvironment, where the bacteria facilitate CD47 blockade’s ability to attack the tumor. We found it does that via the immune signaling pathway called stimulator of interferon genes (STING).”
The findings suggest that a probiotic might someday be used to improve anti-CD47 therapy, says Fu, a Cancer Prevention and Research Institute (CPRIT) Scholar and holder of the Mary Nell and Ralph B. Rogers Professorship in Immunology at UT Southwestern.
The researchers also found that tumor-bearing mice that normally respond to anti-CD47 treatment failed to respond if their gut bacteria were killed off by antibiotics. In contrast, anti-CD47 treatment became effective in mice that are usually nonresponsive when these animals were supplemented with Bifidobacteria, a type of bacteria that is often found in the gastrointestinal tract of healthy mice and humans.
They further discovered that the bacteria migrate into tumors, activating the STING immune signaling pathway. This sets off production of immune signaling molecules such as type 1 interferons and activating immune cells that appear to attack and destroy the tumor once the anti-CD47 agent nullifies the CD47’s “don’t eat me” tag, the researchers report. The researchers found that mice genetically unable to activate type 1 interferon failed to respond to the bacteria-immunotherapy approach. Similarly, mice unable to access the STING pathway showed no benefit from the combined bacteria-immunotherapy approach, confirming that STING signaling is essential.
“It is very possible that more than one type of gut microbiota could enhance tumor immunity in a similar way and we would like to investigate that,” he adds.
Fu and Ralph R. Weichselbaum, M.D., at the University of Chicago led the study. Co-authors include lead authors Yaoyao Shi and Wenxin Zheng as well as Kaiting Yang, Katharine G. Harris, Kaiyuan Ni, Lai Xue, Wenbin Lin, and Eugene B. Chang, all of the University of Chicago.
Fitness
6 Exercise safety tips
Now, as social restrictions ease, you may find yourself stepping up your workouts, whether you’re training for an event or working to improve your game in a recreational league.

In the wake of the COVID-19 pandemic, many Americans are more aware of their health and wellness. Now, as social restrictions ease, you may find yourself stepping up your workouts, whether you’re training for an event or working to improve your game in a recreational league.
Sprains, strains and injuries can happen to even the most seasoned athletes. When you’re testing your limits, even a minor injury can alter your performance. Consider products and supports like these from the CURAD Performance Series product line, available at Walmart and Amazon, to help you get back in the game quickly and safely.
Find more resources to support your fitness journey at CURAD.com.
Keep Dirt and Germs Away
The more active you are, the harder it can be to find a bandage that stays with you all day or all game long.
Spray Away Sore Spots
Controlling mild pain can help keep you at the top of your game, and a topical analgesic works fast to heal common pain brought on by fitness and exercise, such as pain in knees, feet, shoulders and backs.
Put Pain in the Past
When recovery becomes the name of the game and pain relief is needed after daily workouts or bodily injuries. Cold packs work to heal bruises, reduce swelling and relieve headaches and general pain points while microwavable heat packs provide satisfying heat therapy to address sore and stiff joints, muscle cramps and tension.
Reduce Impact of Knee Strain
Weak, injured or arthritic knees can come from many sources, including tendonitis and a wide range of conditions that result in strain or overuse. An adjustable band can provide support for on-field sports and during workouts or everyday activities.
Manage Pain and Relieve Pressure
If you participate in endurance and strength exercises or certain sports, you may ask a lot of your joints. Kinesiology tape can be configured a multitude of ways to help reduce pain and improve blood circulation, as well as relieve tension and pressure.
Control Back Strain
When your back is strained, your body and performance can suffer. A mild or moderate sprain can benefit from strong support and compression.
Fitness
Exercise can provide relief for dry, itchy eyes
A significant increase in tear secretion and tear film stability after participating in aerobic exercise can be another remedy for relieving dry, itchy eyes.

A team led by researchers from the University of Waterloo discovered that a significant increase in tear secretion and tear film stability after participating in aerobic exercise can be another remedy for relieving dry, itchy eyes.
Every time we blink, our eyes are covered in tear film—an essential protective coating necessary for maintaining healthy ocular function. Healthy tear film comprises three layers–oil, water, and mucin–that work together to hydrate the ocular surface and protect against infection-causing irritants like dust or dirt.
When any part of the tear film becomes unstable, the ocular surface can develop dry spots, causing eye symptoms like itchiness or stinging and burning sensations.
“With so much of our activity tied to screen usage, dry eye symptoms are becoming increasingly common,” said Heinz Otchere, a PhD candidate in vision science at Waterloo. “Instead of having to use eye drops or other alternative treatments, our study aimed to determine if remaining physically active can be an effective preventative measure against dryness.”
Fifty-two participants were divided into two groups—athlete and non-athlete—to participate in an exercise session. Participants in the athlete group exercised at least five times per week, while non-athlete participants exercised no more than once per week. Researchers, which included experts from the University of Cape Coast in Ghana, performed visual examinations before and five minutes after each exercise session, where tear secretion and tear break-up time were assessed.
While participants in the athlete group showed the largest increase, Otchere says all participants experienced a meaningful boost in tear quantity and tear film stability after the exercise session.
“It can be challenging for people to regularly exercise when the demand is there to work increasingly longer hours in front of screens,” Otchere said. “However, our findings show physical activity can be really important for not just our overall well-being, but for our ocular health too.”
The study, Differential effect of maximal incremental treadmill exercise on tear secretion and tear film stability in athletes and non-athletes, was co-authored by Otchere, the University of Cape Coast’s Samuel Abokyi, Sekyere Nyamaah, and Michael Ntodie, and Ghana’s Our Lady of Grace Hospital’s Yaw Osei Akoto. It was recently published in the Experimental Eye Research journal.
Fitness
Late-life exercise shows rejuvenating effects on cellular level
Late-life exercise mitigates skeletal muscle epigenetic aging.

For people who hate exercising, here comes some more bad news: it may also keep you younger. Not just looking younger, but actually younger, on an epigenetic level. By now, the benefits of exercise have been well established, including increased strength of bones and muscles, improved mobility and endurance, and lower risk of heart disease, diabetes and high blood pressure.
But younger?
A study recently published in Aging Cell, “Late-life exercise mitigates skeletal muscle epigenetic aging,” suggests this could be the case. The paper was written by a team of seven researchers across three institutions, including Kevin Murach, an assistant professor in the Department of Health, Human Performance and Recreation at the U of A. Murach’s grant from the National Institute of Health funded the study, and he was one of three co-first authors.
Bootcamp for Mice
While the paper is dense with data, reflecting the use of several analytic tools, the experiment that generated the data was relatively straightforward. Lab mice nearing the end of their natural lifespan, at 22 months, were allowed access to a weighted exercise wheel. Generally, mice require no coercion to run and will do so voluntarily. Older mice will run anywhere from six to eight kilometers a day, mostly in spurts, while younger mice may run up to 10-12 kilometers. The weighted wheel ensured they built muscle. While there isn’t a direct analogue to most human exercise routines, Murach likened it to “a soldier carrying a heavy backpack many miles.”
When the mice were studied after two months of progressive weighted wheel running, it was determined that they were the epigenetic age of mice eight weeks younger than sedentary mice of the same age — 24 months. Murach noted that while the specific strain of mice and their housing conditions can impact lifespans, “historically, they start dropping off after 24 months at a significant rate.” Needless to say, when your lifespan is measured in months, an extra eight weeks — roughly 10 percent of that lifespan — is a noteworthy gain.
Methylation, My Dear Watson
The science behind this, while complicated, hinges largely on a biological process known as DNA methylation. A recent New York Times article discussing Murach’s work on muscle memory described methylation “as a process in which clusters of atoms, called methyl groups, attach themselves to the outside of genes like minuscule barnacles, making the genes more or less likely to turn on and produce particular proteins.”
As the body ages, there tends to be increased DNA methylation, or even hypermethylation, at promoter sites on genes in muscle. “DNA methylation changes in a lifespan tend to happen in a somewhat systematic fashion,” Murach explained, “to the point you can look at someone’s DNA from a given tissue sample and with a fair degree of accuracy predict their chronological age.” Due to this, researchers can use one of a number of “methylation clocks” to determine the age of a DNA sample.
DNA Methylation, Aging and Exercise
While the paper strengthens the case for exercise, there is still much that needs to be learned. Though the connection between methylation and aging is clear, the connection between methylation and muscle function is less clear. Murach is not yet prepared to say that the reversal of methylation with exercise is causative for improved muscle health. “That’s not what the study was set up to do,” he explained. However, he intends to pursue future studies to determine if “changes in methylation result in altered muscle function.”
“If so, what are the consequences of this?” he continued. “Do changes on these very specific methylation sites have an actual phenotype that emerges from that? Is it what’s causing aging or is it just associated with it? Is it just something that happens in concert with a variety of other things that are happening during the aging process? So that’s what we don’t know.”
-
NewsMakers3 weeks ago
Mantawi Residences debuts showroom at Robinsons Galleria Cebu
-
NewsMakers1 week ago
RLC Residences gets global recognitions in Dubai
-
NewsMakers2 weeks ago
Pru Life UK awarded at 20th annual International Business Awards
-
Home Care3 weeks ago
7 Backyard improvements that make a difference
-
NewsMakers3 weeks ago
Assess risk of stroke in just 3 minutes with stroke risk calculator
-
NewsMakers1 week ago
Pru Life UK, Prudence Foundation partner with ASSIST for Project Padayon
-
Home Care3 weeks ago
How to use your hot tub all Fall and Winter
-
Home Care4 weeks ago
Secret tips to gracious holiday entertaining