Poor blood flow linked to supercharged tumor growth

When most of us think about our immune systems, our concerns typically center on whether we can fight off the cold or flu this year.

But the truth is that a healthy immune system is a key component of total body health.

That’s because your immune system isn’t only your body’s first-line defense against this season’s germs. It is also vital for launching assaults on serious conditions, like cancer.

However, according to research from NYU Langone Health, there is something that can destroy that cancer-fighting ability.

And it all has to do with how well your blood is flowing…

Double the rate of tumor growth

Peripheral ischemia includes reduced blood flow to the lungs and legs. It typically follows peripheral artery disease and is a manifestation of worsening symptoms that impact blood flow. But that’s not all it does…

The scientists at NYU were able to prove that peripheral ischemia dramatically fueled cancer growth.

In fact, tumors in mice with restricted blood flow grew at double the rate seen in mice with normal flow.

Why? They found that restricted blood flow prematurely ages the bone marrow, where our immune cell warriors are produced.  

In other words, the researchers demonstrated that the immune system is the missing link between poor blood flow and the proliferation of cancer cells.

Increasing cancer-tolerance and decreasing tumor defense

According to scientists, when there is a threat to the body, such as cancer, the immune system typically ramps up inflammation to eliminate the danger and then eases back on the throttle to avoid damaging healthy tissue (think autoimmune issues).

However, when you suffer from circulation problems, the aging of your bone marrow reprograms stem cells to favor the production of “myeloid” immune cells (monocytes, macrophages, neutrophils) that dampen immune responses.

At the same time, these stem cells begin to decrease their production of lymphocyte-like T cells, which help mount strong antitumor responses.

Altogether, this shifts immune cells into a more cancer-tolerant state, weakening the immune system’s ability to fight cancer.

“Our results reveal a direct mechanism by which ischemia drives cancer growth, reprogramming stem cells in ways that resemble aging and promote immune tolerance,” says first author Alexandra Newman, PhD.

“These findings open the door to new strategies in cancer prevention and treatment, like earlier cancer screening for patients with peripheral artery disease and using inflammation-modulating therapies, to counter these effects.”

Increase blood flow to lower cancer risks

All of this means that if you want to cancer-proof your body, you have to start with supporting your blood vessels. Easy ways to do this include:

• Taking omega-3s – People with peripheral artery disease (PAD) have been shown to have lower levels of healthy omega-3s in their bodies, so taking a fish – or preferably krill oil – supplement could help. Omega-3s not only support better blood flow but also have potent anti-inflammatory effects.
• Getting help stretching – Passive stretching, with the help of a partner, can improve blood flow, blood vessel dilation and reduce stiffness.
• Eating beets – Beets are packed with heart-healthy nitrates, which boost the production of nitric oxide (NO) in the lining of your blood vessels, allowing them to dilate or widen. When this happens, your blood can flow more freely.

Additionally, because the scientists believe that inflammation-modulating therapies could be a key approach, be sure to take steps to reduce your overall body inflammation.

My favorite way to do this is by eating an anti-inflammatory diet that would include these foods:

• Tomatoes
• Olive oil
• Green leafy vegetables, like spinach, kale, and collard greens
• Nuts such as almonds and walnuts
• Fatty fish, which includes salmon, mackerel, tuna and sardines
• Fruits such like oranges, strawberries, blueberries and cherries

Skip or strictly limit foods that increase inflammation in your body, such as processed meats, refined carbs, sodas, and packaged snacks.

Staying active is also a good idea, as exercise not only improves blood flow but also has anti-inflammatory effects on your white blood cells.

Sources:

Restricted Blood Flow Speeds Tumor Growth by Aging the Immune System – NYU Langone Health

Foods that fight inflammation – Harvard Health Publishing

An action plan to fight unhealthy inflammation – Harvard Health Publishing