Why Chronic Lung Disease Symptoms Can Be Easy To Overlook

Chronic lung disease (CLD) develops far before the appearance of the obvious symptoms. The gradual decline in exercise tolerance, recurrent respiratory symptoms, persistent cough or breathlessness might sometimes appear relatively insignificant. However, at times such changes reflect dysfunction in airway function, inflammation, gas exchange, or lung tissue structure.​

Gradually, the respiratory capacity of the individual declines, resulting in pathological changes. Understanding Chronic Lung Disease Symptoms enables answering larger scientific questions: Can damaged lung tissues get repaired? Such questions drive interest in advanced approaches like regenerative medicine. Currently, the established conventional treatment approach remains central to patient care. Researchers are actively exploring lung regeneration with stem cells to influence inflammation, modulate immune response, and boost tissue repair. The current article explores beyond chronic lung disease symptoms and advanced therapeutic possibilities to combat it at an early stage.

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What is the Biology Behind the Symptoms?

Chronic Lung Disease Involves a Cascade of Biological Reactions that Progressively Affect the Parts of the Lungs Such as Airways, Alveoli, or Blood Vessels. Chronic Lung Disease Symptoms Include:

• Persistent Lung Injury: Disrupts normal lung function due to exposure to various risk factors, including smoking, environmental pollutants, allergens, etc.
• Sustained Inflammation: Repetitive lung damage leads to inflammation. Chronic inflammation recruits immune cells and inflammatory mediators into the lung. Gradually, the airway narrows, and tissue damage increases mucus production, leading to altered lung function.  
• Oxidative Stress: Increased oxidative stress damages cellular compartments and amplifies inflammatory responses
• Airway Remodeling: Low-grade persistent inflammation introduces structural changes in the airway walls. The airway thickens, and the smooth muscle activity gets altered. The airway remodeling leads to less efficient airflow and leads to symptoms like cough, wheezing, breathlessness, fatigue, etc.
• Fibrosis: Repeated injury triggers excessive deposition of the extracellular matrix (ECM), including collagen at the injury site. The flexibility of the lung tissue gets compromised.
• Fatigue: Reduced oxygen delivery increases efforts for breathing, sleeplessness, and systemic inflammation. Individual experiences of reduced stamina

What are Chronic Lung Disease Symptoms?

Chronic Lung Disease Symptoms appear like a cascade of reactions. Beginning from the early stage to the advanced stage, the symptoms appear consecutively. The potential chronic lung disease symptom progression occurs as:

• Dyspnea/ Breathlessness (Decreased oxygen exchange)
• Persistent cough and increased mucus production (compromised airway)
• Wheezing or tightness in chest
• Reduced tolerance to exercise
• Recurrent infection in the airway tract
• Frequent fatigue and decline in airway function

One Term, Many Diseases: Understanding Chronic Lung Disease

Chronic Lung Disease Symptoms’ Appearance Depends on Its Subtype. This Includes:

Restrictive Lung Disease

• The lung tissue is inflamed, stiff and scarred. Inhalation becomes difficult; the lung does not expand completely.
• Common subtypes include pulmonary fibrosis, sarcoidosis, and work-associated lung issues (black lung, asbestosis, silicosis)

Obstructive Lung Disease

• The airway gets obstructed due to inflammation and mucus buildup. The air sacs get damaged.
• Subtypes include asthma, COPD, chronic bronchitis, emphysema, cystic fibrosis.

Pulmonary Vascular Lung Disease

• The blood vessels reaching the lungs are compromised. The coordination between heart and lung becomes challenging.
• Common subtypes include pulmonary hypertension and pulmonary embolism.

How Chronic Lung Disease (CLD) is Treated?

The Conventional CLD Treatment Involves:

Medication

• Corticosteroids to combat chronic inflammation
• Antibiotics for frequent bacterial infection
• Bronchodilators or inhalers to open up the airways
• Nebulizer with liquid medication 

Oxygen Therapy

• To improve oxygen level in the lungs
• The BiPAP machine helps with breathing during exacerbation.

Lifestyle Changes

• Cessation of risk factors like smoking
• Avoid workplace-related pollutant or particulate matter exposure risk.

Pulmonary Rehabilitation

• Exercise to train lungs and help manage respiratory issues
• Strategic combination of medication, lifestyle changes, nutritional support and regular respiratory training

Surgery

• Lung volume reduction (LVR) is a surgical intervention.
• Reduces trapped air in the lungs.

*NOTE: Conventional Chronic Lung Disease Treatment accounts for symptom management and addressing the co-morbid condition. However, none can potentially reverse the respiratory damage. This has motivated researchers to investigate advanced treatments with regenerative medicine to target the underlying damage.

The Bigger Question: Is Damaged Lung Repairable?

Currently, lung regeneration with stem cells is emerging as an advanced CLT treatment approach. Regenerative medicine intends to target the root cause of lung damage. Regenerative Medicine in Respiratory Disorders aims to replace damaged lung tissue and move the treatment beyond symptom management. Researchers are widely exploring stem cell research as a regenerative approach.

How Stem Cells Serve as a New Therapeutic Strategy?

Researchers have unveiled the potential of Regenerative Medicine in Respiratory Disorders. Mesenchymal stem cells (MSCs) have regenerative abilities and introduce paracrine signalling. The potential mechanisms of stem cells include:

• Lung Tissue Regeneration: The introduction of MSCs supports lung tissue regeneration. Some of the MSCs themselves develop into specific types of lung tissue based on the stimulus. MSCs also release various cytokines and signalling molecules that boost regeneration of the lung cells.
• Boost Damaged Lung Tissue Repair: MSCs release various signalling molecules that boost the body’s natural repair mechanism.
• Anti-Inflammation: MSCs release various anti-inflammatory molecules that combat pro-inflammatory signaling. They significantly reduce inflammation and calm the immune response.
• Immunomodulation: MSCs regulate immune response and create a supportive microenvironment. This not only targets chronic lung disease symptoms, but also supports the efficacy of conventional CLD treatment significantly [1].

*NOTE: Currently, preclinical and clinical evidence have supported the safety and tolerability in Regenerative Medicine in Respiratory Disorders. In future, the focus is on the development of structured large-scale clinical trials to establish long-term efficacy of the treatment.

Is Regenerative Medicine Looking Beyond Symptom Management?

Regenerative Therapy for Lung Disease is looking far beyond Chronic lung disease symptom management. The key question involves:

• Conventional treatment focuses on symptom control. Regenerative medicine asks if the tissue damage can be reversed.
• The outcome of the stem cell treatment varies among individuals.
• Various factors influence the treatment outcome, including stem cell quality, source, isolation procedure, administration procedure and individual’s factors.
• It addresses the problem at the cellular level by boosting repair mechanisms and providing paracrine signalling.​

*NOTE: Advancells, India is a leading manufacturer and supplier of clinical-grade stem cells for various chronic conditions including chronic lung disease. The cells are sourced and isolated following stringent quality control protocol. The product is supplied with a Certificate of Authentication (CoA).

The Key Takeaway

• Chronic lung disease symptoms involve persistent cough, wheezing, breathlessness, fatigue, etc.’
• Identification and diagnosis of the signs and symptoms at an early stage is key to appropriate disease management.
• Conventional treatment options aid in symptom management and preserving lung function
• Evolving regenerative medicine can potentially target the disease progression at the cellular level.

Reference

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. 

FAQ’s

Q- What are the Early Symptoms of CLD?

Early Chronic lung disease symptoms involve breathlessness, low tolerance to exercise, persistent cough, wheezing, mucus production, fatigue, etc.

Q- Can CLD Be Reversed?

Reversing CLD depends on the disease stage. The conventional CLD treatment targets symptom management and prevents further decline in lung function. Regenerative Therapy for Lung Disease in the form of stem cell therapy looks promising in targeting the disease at the cellular level.

Q- Is Stem Cell Therapy Effective for CLD?

Preclinical and clinical evidence have reported positive trends in combating Chronic Lung Disease (CLD) with stem cell introduction. Researchers have reported safety, tolerance and efficacy of the approach. However, in future, the focus should be on developing large-scale clinical trials to establish the long-term safety and efficacy of the therapy.