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Fibrosis – Causes, Symptoms and Treatment

Fibrosis is the excessive formation of connective tissue in organs, leading to scarring and loss of function. It can affect many different organs.

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Things worth knowing about "Fibrosis"

Fibrosis is the excessive formation of connective tissue in organs, leading to scarring and loss of function. It can affect many different organs.

What is Fibrosis?

Fibrosis refers to the excessive deposition of connective tissue fibers – particularly collagen – within an organ or tissue. This process occurs as a response to injury, chronic inflammation, or persistent damage, resulting in the scarring of affected tissue. Unlike normal wound healing, fibrosis is an uncontrolled process that permanently alters the original tissue structure and can significantly impair organ function.

Causes

Fibrosis can be triggered by a wide variety of factors. The most common causes include:

Chronic inflammation (e.g., in autoimmune diseases)
Repeated tissue damage (e.g., from alcohol, toxins, or medications)
Infections (e.g., hepatitis B or C in liver fibrosis)
Tissue hypoxia (insufficient oxygen supply)
Mechanical stress or pressure on tissue
Genetic factors (e.g., in cystic fibrosis)

Activated fibroblasts and myofibroblasts play a central role in this process: they produce excessive amounts of collagen and other matrix proteins that accumulate within the tissue.

Common Forms of Fibrosis

Liver Fibrosis and Cirrhosis

Liver fibrosis most commonly results from chronic alcohol misuse, viral hepatitis, or non-alcoholic fatty liver disease. In advanced stages, it progresses to liver cirrhosis, in which functional liver tissue is progressively replaced by scar tissue.

Pulmonary Fibrosis

Idiopathic pulmonary fibrosis (IPF) is a serious lung condition in which lung tissue becomes scarred, making breathing increasingly difficult. The cause is often unknown but may also be triggered by inhalation of harmful substances or autoimmune processes.

Renal Fibrosis

Chronic kidney disease can lead to renal fibrosis, in which kidney tissue becomes progressively scarred and the filtering capacity of the kidneys declines.

Cardiac Fibrosis

Following a heart attack or in cases of chronic heart failure, cardiac fibrosis may develop. The resulting scar tissue impairs the pumping function of the heart and can lead to cardiac arrhythmias.

Cystic Fibrosis

Cystic fibrosis is a genetically inherited condition that primarily affects the lungs and digestive system. It is caused by mutations in the CFTR gene and leads to the production of abnormally thick mucus in various organs.

Symptoms

The symptoms of fibrosis depend greatly on the organ affected. General signs may include:

Reduced organ function (e.g., shortness of breath in pulmonary fibrosis)
Fatigue and general weakness
Pain in the affected area
Hardening or thickening of tissue (e.g., in skin fibrosis)
Jaundice and abdominal swelling (in liver fibrosis)

Diagnosis

Several methods are used to diagnose fibrosis:

Imaging techniques: Ultrasound, MRI, or CT scans to assess tissue changes
Blood tests: Measurement of inflammatory markers and organ-specific values (e.g., liver enzymes)
Tissue biopsy: Removal of a tissue sample for microscopic examination – considered the gold standard
Elastography: A non-invasive technique to measure tissue stiffness, particularly used in liver fibrosis assessment

Treatment

A complete cure for fibrosis is not yet possible in most cases. Treatment focuses on slowing disease progression, addressing underlying causes, and relieving symptoms:

Treatment of underlying causes: e.g., antiviral therapy for hepatitis, alcohol cessation for alcohol-related liver fibrosis
Antifibrotic medications: Agents such as pirfenidone and nintedanib are used in idiopathic pulmonary fibrosis
Anti-inflammatory therapy: Corticosteroids or immunosuppressants for inflammation-driven fibrosis
Symptomatic treatment: Oxygen therapy for pulmonary fibrosis, diuretic therapy for cardiac fibrosis
Organ transplantation: In severe cases (e.g., liver or lung transplant) as a last resort

References

Weiskirchen R, Weiskirchen S, Tacke F. Organ and tissue fibrosis: Molecular signals, cellular mechanisms and translational implications. Molecular Aspects of Medicine, 2019.
Richeldi L, Collard HR, Jones MG. Idiopathic pulmonary fibrosis. The Lancet, 2017;389(10082):1941–1952.
World Health Organization (WHO). Chronic diseases and health promotion. Available at: https://www.who.int (accessed 2024).

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