Navigating Chronic Lung Disease: A Roadmap to Better Recovery

Chronic lung disease is associated with a gradual decrease in lung function. It disrupts normal respiratory function, resulting in breathing difficulties. The conventional treatment involves medications, inhalers, pulmonary rehabilitation, or oxygen therapy. However, these approaches do not reverse the damage caused by long-term inflammation or lung tissue scarring.  

Currently, advances in regenerative medicine have transformed the lung disease treatment landscape. Stem cell therapy, with the introduction of mesenchymal stem cells (MSCs), are widely explored for their regenerative capability. Simultaneously, stem cells support tissue repair and combat chronic inflammation. Although the therapeutic area is still evolving with growing clinical trials, they offer a promising therapeutic avenue beyond conventional approaches. The current article focuses on how stem cells are reshaping the future of Chronic Lung Disease treatment. 

Ask The Expert

Why Lungs Lose Their Ability to Repair Themselves?

In normal conditions, healthy lungs possess impressive capacity to repair themselves. Everyday the lung gets exposed to pollutants, dust particles, allergens, microbes, etc. Specialised cells delegated for the removal of damaged cells maintain lung function. The natural repair mechanism preserves delicate air sacs, allowing adequate gaseous exchange. However, persistent exposure to adversity compromises the lungs’ ability, leading to the appearance of chronic lung disease. 

The Factors Influencing Lung Damage Include: 

• Smoking habits
• Air pollution caused by high traffic and industrial emissions
• Workplace exposure to particulate matter, like in mining, asbestos factor, construction site, etc.
• Shift in climatic conditions like temperature and humidity
• Lifestyle choices like sedentary activities, poor dietary habits, etc. 

Due to continuous exposure to these pollutants, the immune system remains in an active state. It releases inflammatory molecules that damage lung tissues. The repeated cycle of injury and inflammation scars the lung tissue, resulting in fibrosis. The scarred lung tissue interferes with gaseous exchange and adequate blood flow. 

What are the Types of Chronic Lung Disease?

Common Types of Lung Disease Include:

• Chronic Obstructive Pulmonary Disease (COPD): Caused by continuous inflammation that destroys the air sacs and narrows the airway
• Pulmonary Fibrosis: Excessive scarred tissue replaces healthy lung tissue. The lung loses its flexibility and becomes rigid
• Asthma: Chronic inflammation in the airway, airway remodeling
• Occupational Lung Disease: Silicosis, pneumoconiosis (black lung), histoplasmosis, Asbestosis

Healthy Lung Transforming into Diseased Lung 

Why Conventional Treatments Cannot Reverse Lung Damage?

Common Lung Disease Treatments Include:

Medications

• Bronchodilators or inhalers for relaxing tightened muscles
• Steroids to combat chronic inflammation and irritation inside airways
• Antibiotics to combat active infection

Oxygen Therapy

• Introduction of nasal tube or oxygen mask for introducing adequate oxygen supply
• Supports lung function and combats respiratory issues

Pulmonary Rehabilitation

• Introduction of advanced breathing exercises and energy-saving tips 
• Clinicians often combine medication and oxygen therapy with pulmonary rehabilitation for Pulmonary Fibrosis Treatment 

Lifestyle Changes

• Quit smoking (active or passive) and dietary intervention
• Avoid common triggers such as allergens, dust, strong chemicals, etc.

*NOTE: Despite the availability of a wide range of therapeutic options, none can reverse lung damage. The evolving regenerative medicine potentially intends to shift the disease management to tissue regeneration. 

What Makes Regenerative Medicine Different?

Regenerative medicine intends to support the body’s natural healing mechanism. Stem cell therapy is transforming into a revolutionary treatment option due to their regenerative capacity and paracrine signalling. Researchers have widely explored mesenchymal stem cells (MSCs)  against chronic lung disease. The cells are isolated from distinct sources, including umbilical cord tissue/blood, adipose tissue, or bone marrow. The cells are multilineage and release various bioactive molecules that regulate inflammation, immune response, and communication between cells. 

MSCs exhibit low immunogenicity, so they have the lowest chance of immune rejection. Various preclinical and clinical studies supported their safety and tolerance profiles among patients with chronic lung diseases. Clinicians are combining stem cell treatment with conventional therapies as supportive options for better health outcomes.

How Stem Cells Support Lung Regeneration?

Current Studies Suggest the Efficacy of Stem Cells in Lung Disease Treatment. The Mechanism of Action Includes:

• Direct Cell Replacement: MSCs introduced at the target site replace the dead or scarred cells. MSCs differentiate into a specific cell type based on stimulation
• Activation of Repair Mechanism: MSCs release various bioactive molecules like cytokines, growth factors, and signalling molecules. They boost the body’s natural healing mechanism.
• Anti-Inflammation: MSCs release anti-inflammatory molecules that combat the action of proinflammatory signals. They target long-term chronic inflammation, worsening lung problems in the patient.
• Immunomodulation: MSCs have immunomodulatory properties; that is, they modulate the immune response. Exposure to triggers keeps the immune system hyperactive, which ultimately causes scarring. MSCs calm the immune response and create a healthier microenvironment that supports healthier tissue survival. 
• Angiogenesis: MSCs release various growth factors, including VEGF, FGFs, etc., that support new blood vessel formation. This allows adequate blood and oxygen supply to the lungs.

Which Lung Diseases Are Being Studied for Stem Cell Therapy?

Lung Disease Treatment with Stem Cells are Investigated Currently for Various Chronic Lung Disease Including:

• COPD: Extensively studied to reduce inflammation, improve exercise tolerance, and support lung function
• Pulmonary Fibrosis (IPF): Modulation of inflammation, reduced fibrotic progression, and support for tissue repair
• Bronchiectasis: reduction of persistent airway inflammation, healing of damaged airways, decreased frequency of disease exacerbation
• Severe Asthma: Exercise tolerance, modulation of immune response

What Does Clinical Research Report?

• Better tolerance to exercise
• Reduced chronic inflammation in lung tissue
• Improved lung function and decreased breathing difficulties
• Improvement in patients’ quality of life

*Stem cell therapy has a distinct outcome among chronic lung disease patients. The overall outcome depends on stem cell quality, source, administration procedure, disease severity, and co-morbid condition. Advancells, India, is a leading supplier of clinical-grade stem cells for various chronic diseases.

Conclusion

Chronic lung disease management remains challenging due to intense tissue damage and limited regenerative capacity. In recent times, stem cell therapy has gained insights due to regenerative strategies aimed at rejuvenation and repair of the damaged lung tissues. Further, large-scale clinical trials can establish the long-term efficacy and safety of the therapy.

References

1. Lai S, Guo Z. Stem cell therapies for chronic obstructive pulmonary disease: mesenchymal stem cells as a promising treatment option. Stem cell research & therapy. 2024 Sep 19;15(1):312. 
2. Abbaszadeh H, Ghorbani F, Abbaspour-Aghdam S, Kamrani A, Valizadeh H, Nadiri M, Sadeghi A, Shamsasenjan K, Jadidi-Niaragh F, Roshangar L, Ahmadi M. Chronic obstructive pulmonary disease and asthma: mesenchymal stem cells and their extracellular vesicles as potential therapeutic tools. Stem Cell Research & Therapy. 2022 Jun 20;13(1):262. 

FAQ’s

Q- Can Damaged Lung Tissue Heal Naturally?

No, lungs have limited capacity for self-healing. With minor injury, a healthy lung replaces the cells perfectly. However, with tissue scarring and repetitive inflammation, the lung loses its healing capacity.

Q- What are the Lung Disease Symptoms?

Lung disease symptoms include breathlessness, fatigue, chronic cough, wheezing, mucus accumulation in the airway, or chest pain.

Q- What are Types of Lung Diseases?

Types of Lung Diseases include obstructive (COPD, bronchitis, asthma, emphysema), restrictive (pulmonary fibrosis, sarcoidosis), and infectious (tuberculosis, pneumonia). 

Q- Is Stem Cell Therapy Approved as a Standalone Treatment?

No, current stem cell treatments are still in the early stage of preclinical and clinical investigation. Though at an early stage, they suggest a positive trend towards patient safety and tolerance.

Q- Can Stem Cell Therapy Replace Conventional Treatments?

No, currently clinicians are introducing stem cell therapy with conventional treatment. It acts as a supportive strategy that helps in better patient outcomes.