Key Takeaways
- Asbestos fibers can remain in the body’s tissues and trigger a long-lasting inflammatory response that may contribute to mesothelioma development.
- When asbestos fibers reach the pleura, they can damage mesothelial cells and activate immune cells that respond to the injury.
- Damaged cells can release HMGB1, a signaling protein that helps attract immune cells and maintain inflammation around asbestos fibers.
- Macrophages may struggle to remove asbestos fibers and can remain activated, releasing inflammatory substances such as IL-1β and TNF-α.
- Long-term inflammation can contribute to oxidative stress and DNA damage, potentially allowing abnormal mesothelial cells to survive and accumulate additional changes.
- Researchers are studying inflammatory pathways such as HMGB1, IL-1β, TNF-α, and NF-κB as possible future targets for mesothelioma treatment, although these approaches remain under investigation.
How chronic inflammation contributes to mesothelioma is an important question for understanding what happens inside the body after asbestos exposure. Mesothelioma is strongly associated with asbestos, and research shows that asbestos fibers can trigger a long-lasting inflammatory response in the tissues where the fibers become lodged. Over time, this inflammation can contribute to cellular damage and changes that may lead to mesothelioma.
Researchers are still studying exactly how asbestos causes normal mesothelial cells to become cancerous. However, chronic inflammation appears to be an important part of this process.
What Is Chronic Inflammation?
Inflammation is normally a helpful response from the immune system.
When the body detects an injury or harmful substance, immune cells move to the affected area. These cells release chemicals that help control the damage and begin the healing process.
Normally, inflammation eventually stops.
Chronic inflammation is different. Instead of resolving after the initial problem is addressed, the inflammatory response continues over a long period of time.
The National Cancer Institute explains that chronic inflammation can cause DNA damage over time and contribute to the development of cancer.
With asbestos exposure, the problem is that asbestos fibers can remain in the body’s tissues for long periods.
How Asbestos Triggers Inflammation
When asbestos-containing materials are disturbed, microscopic fibers can become airborne and enter the body when inhaled.
Some asbestos fibers can travel into the lungs and eventually reach the pleura, the thin lining surrounding the lungs.
The fibers can remain in the tissue because the body has difficulty breaking them down or removing them.
The National Cancer Institute notes that asbestos fibers can remain in the body for a long time and cause inflammation and scarring. Asbestos exposure is also the major known risk factor for mesothelioma.
Once asbestos fibers become lodged in tissue, the immune system attempts to respond.
This is where chronic inflammation can begin.
What Happens to Mesothelial Cells?
The pleura contains specialized cells called mesothelial cells.
These cells can be damaged when asbestos fibers become lodged nearby.
Research suggests that asbestos can cause some mesothelial cells to die. When damaged cells die, they can release substances that alert the immune system that something is wrong.
One important substance researchers have studied is called HMGB1.
HMGB1 normally has important functions inside cells. However, when cells are damaged, HMGB1 can move outside the cell and act as a signal that attracts immune cells to the area.
This can help start and maintain an inflammatory response.
Research reviews have identified HMGB1 as an important regulator of asbestos-related chronic inflammation and mesothelioma development.
The Role of Macrophages
Macrophages are immune cells that help the body respond to foreign substances and damaged cells.
When asbestos fibers become lodged in tissue, macrophages attempt to surround and remove them.
However, asbestos fibers can be difficult for these cells to break down.
Researchers sometimes describe this as a “frustrated” immune response.
Instead of eliminating the asbestos fibers, macrophages can remain activated around them and release inflammatory substances.
These substances can include cytokines such as IL-1β and TNF-α, which help regulate inflammation.
When this response continues over a long period, it can create a chronic inflammatory environment around the asbestos fibers.
How Inflammation Can Damage DNA
One of the most important connections between inflammation and cancer involves oxidative stress.
During an inflammatory response, immune cells can produce reactive oxygen and nitrogen species. These substances help the body respond to threats, but excessive amounts can damage cells.
Research into asbestos-related mesothelioma has found that asbestos exposure can increase the production of reactive oxygen species and contribute to DNA damage in mesothelial cells.
DNA contains the instructions that control how cells grow, divide, and repair themselves.
When DNA becomes damaged, cells may develop abnormal changes.
Most damaged cells do not become cancerous. The body has systems that can repair damaged DNA or remove abnormal cells.
However, researchers believe that repeated cellular damage, inflammation, and other changes caused by asbestos can create conditions that allow some abnormal cells to survive and eventually become malignant.
How Inflammation May Help Damaged Cells Survive
Chronic inflammation does more than cause cellular damage.
Research suggests that some inflammatory signals can also activate pathways that help damaged cells survive.
One pathway researchers have studied is called NF-κB.
Inflammatory substances such as TNF-α can activate NF-κB. This pathway can promote cell survival and the production of additional inflammatory signals.
In asbestos-exposed tissue, these survival signals may allow some damaged mesothelial cells to remain alive rather than being eliminated by the body’s normal defenses.
Over many years, cells that survive with genetic damage may accumulate additional changes.
This is one reason researchers believe chronic inflammation may contribute to the long development process of mesothelioma.
Why Mesothelioma Can Take Decades to Develop
The connection between asbestos and chronic inflammation helps explain one of the most unusual features of mesothelioma: its long latency period.
A person may be exposed to asbestos at work and not develop mesothelioma until decades later.
The cancer does not usually appear immediately after exposure.
Instead, researchers believe that asbestos can initiate a series of biological events involving cellular injury, inflammation, oxidative stress, DNA damage, and abnormal cell survival.
These processes can occur over many years.
This long timeline is one reason someone diagnosed with mesothelioma today may have been exposed to asbestos decades ago.
Can Chronic Inflammation Cause Mesothelioma Without Asbestos?
Chronic inflammation can contribute to the development of several types of cancer. However, mesothelioma is strongly associated with asbestos exposure, and asbestos is the major known risk factor for the disease.
The exact process by which mesothelioma develops is complex and is still being studied.
Not everyone exposed to asbestos develops mesothelioma, and researchers believe that genetic and other biological factors may also influence an individual’s risk.
This means chronic inflammation should not be viewed as the only cause of mesothelioma.
Instead, it appears to be one important part of a much larger process.
Could Inflammation Become a Treatment Target?
Researchers are studying whether the inflammatory processes involved in mesothelioma could eventually become treatment targets.
HMGB1, IL-1β, TNF-α, and other inflammatory pathways have been investigated because of their potential role in mesothelioma development and progression.
Some experimental approaches have attempted to interfere with these pathways.
However, research into these treatments is still developing. A potential target identified in laboratory research does not automatically mean that a treatment is proven to prevent or cure mesothelioma.
More clinical research is needed to determine which approaches could benefit patients.
What This Means for Mesothelioma Patients
Understanding inflammation does not change the fact that mesothelioma is a serious disease.
However, learning how asbestos affects cells can help researchers identify new ways to detect and treat the cancer.
Scientists are continuing to study the relationship between asbestos, inflammation, oxidative stress, genetics, and the immune system.
This research may eventually lead to better methods for identifying mesothelioma earlier and developing treatments that target specific biological processes involved in the disease.
Understanding the Connection Between Inflammation and Mesothelioma
The relationship between chronic inflammation and mesothelioma is complex.
Asbestos fibers can remain in tissue and trigger an ongoing immune response. Damaged cells can release signals such as HMGB1, which attract immune cells and help maintain inflammation. Macrophages and other immune cells can then release inflammatory substances and reactive molecules that contribute to cellular damage.
Over many years, this combination of inflammation, oxidative stress, DNA damage, and abnormal cell survival may contribute to the development of mesothelioma.
Researchers are still working to understand every step of this process.
For patients and families, the most important point is that mesothelioma research continues to uncover new information about how the disease develops and how it may eventually be treated more effectively.
If you or a loved one has been diagnosed with mesothelioma after asbestos exposure, call (800) 505-6000 for a free consultation or fill out our online contact form to learn more about available resources and support.
Frequently Asked Questions
How does chronic inflammation contribute to mesothelioma?
Asbestos fibers can remain in tissue and trigger a long-lasting immune response. Over time, inflammatory cells can release substances that contribute to cellular damage, oxidative stress, and DNA changes. Researchers believe these processes may play a role in the development of mesothelioma.
How does asbestos trigger inflammation?
When asbestos fibers become lodged in tissue, the body’s immune system attempts to respond to them. Because asbestos fibers can be difficult to break down or remove, immune cells may remain active around the fibers and create a chronic inflammatory response.
What is HMGB1 and why is it important in mesothelioma?
HMGB1 is a protein that normally has important functions inside cells. When cells are damaged, HMGB1 can be released outside the cell and act as a signal that attracts immune cells. Researchers have identified HMGB1 as an important part of asbestos-related inflammation and mesothelioma development.
How can inflammation damage cells?
During inflammation, immune cells can produce reactive oxygen and nitrogen species. Excessive amounts of these substances can cause oxidative stress and damage cellular DNA. Repeated damage may contribute to abnormal changes in cells over time.
Can chronic inflammation cause mesothelioma without asbestos exposure?
Chronic inflammation can contribute to several types of cancer, but asbestos is the major known risk factor for mesothelioma. The development of mesothelioma is complex, and researchers believe that genetic and other biological factors may also influence an individual’s risk.
Could inflammation become a future treatment target for mesothelioma?
Researchers are studying inflammatory pathways including HMGB1, IL-1β, TNF-α, and NF-κB because of their potential role in mesothelioma. However, these approaches are still being investigated, and a potential treatment target is not the same as a proven treatment. If you or a loved one has been diagnosed with mesothelioma, call (800) 505-6000 or reach out through our contact form to learn about available resources and support.
Sources:
Causes & Risk Factors | Mesothelioma
HMGB1 released by mesothelial cells drives the development of asbestos-induced mesothelioma – PMC
