Rheumatoid arthritis is an autoimmune attack on your joints and more
In short: This animation explains how your immune system turns against your own body, causing pain, deformity, and disability. It's not just about joints—it's a systemic disease with genetic and environmental triggers. Understanding the science behind it could change how you think about chronic illness.
Rheumatoid arthritis (RA) is a systemic autoimmune disorder, not just a joint disease. The immune system mistakenly attacks the body's own tissues, including joints, eyes, skin, mouth, lungs, heart, and blood vessels. This animation from Alila Medical Media breaks down the pathophysiology, from the initial stages in small joints to the progression into larger ones, and the eventual destruction of cartilage and bone.
The disease typically starts in the small peripheral joints of the hands and feet, often affecting both sides symmetrically. As it progresses, it moves to larger joints like the wrists, ankles, elbows, knees, shoulders, and hips. In these joints, synovial tissue becomes infiltrated with immune cells and inflammatory factors, leading to the breakdown of joint structures. Without treatment, this chronic inflammation can result in severe deformities and disability.
Genetics play a significant role in RA susceptibility. Variations in the MHC class II molecules, particularly those with a shared epitope of five amino acids, are linked to an increased risk of the disease. These variations may cause T-cells to mistakenly attack self-antigens, such as citrullinated peptides. Anti-citrullinated peptide antibodies are present in up to 80% of RA patients, indicating a strong autoimmune response.
Environmental factors like smoking, certain bacteria, and high-calorie low-fiber diets also contribute to RA risk. Smoking increases PAD expression in the airways, while some bacteria produce PAD-like enzymes that boost citrullination. Obesity and middle age are also associated with higher susceptibility, though the disease can occur at any age. Women are more likely to be affected than men.
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Sources
- Summary by Intellect · source: Rheumatoid Arthritis, Animation
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