What are the three primary pathways of the complement system?
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Roles of complement pathways and autoantibodies (ANA, RF, anti-CCP) in disease pathogenesis and diagnosis.
By mastering this deck, learners will understand how complement activation and specific autoantibodies contribute to the pathogenesis of rheumatic diseases, enhancing their diagnostic accuracy and ability to interpret laboratory findings in clinical practice.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What are the three primary pathways of the complement system? | The three primary pathways are the classical pathway, the lectin pathway, and the alternative pathway. | Think of classical as antibody-dependent, lectin as carbohydrate recognition, and alternative as spontaneous activation. |
| 2 | Which complement pathway is predominantly activated in immune complex-mediated diseases like systemic lupus erythematosus? | The classical pathway is predominantly activated in immune complex-mediated diseases such as SLE. | Classical pathway is antibody-dependent, key in immune complex diseases. |
| 3 | What is the role of complement activation in the pathogenesis of rheumatoid arthritis? | Complement activation contributes to synovial inflammation and joint destruction by promoting recruitment of inflammatory cells and releasing tissue-damaging enzymes. | Complement acts as an amplifier of inflammation in RA. |
| 4 | What is the significance of decreased serum complement levels (C3, C4) in patients with systemic lupus erythematosus? | Decreased C3 and C4 levels indicate complement consumption due to ongoing immune complex deposition and activation, correlating with disease activity. | Low complement levels suggest active immune complex disease. |
| 5 | Name the main autoantibody associated with systemic lupus erythematosus. | Antinuclear antibodies (ANA) are the hallmark autoantibodies in SLE. | ANA is a broad autoantibody, often the first test ordered. |
| 6 | What autoantibody is most specific for rheumatoid arthritis? | Rheumatoid factor (RF) and anti-cyclic citrullinated peptide (anti-CCP) antibodies are both associated, but anti-CCP has higher specificity. | Anti-CCP is more specific than RF for RA. |
| 7 | How does the presence of anti-CCP antibodies aid in the diagnosis of rheumatoid arthritis? | Anti-CCP antibodies are highly specific for RA and can predict more aggressive disease and joint damage. | Think of anti-CCP as a 'rheumatoid signature' for diagnosis. |
| 8 | Which autoantibody is commonly positive in Sjögren's syndrome but can also be seen in other autoimmune diseases? | Anti-Ro (SSA) and anti-La (SSB) antibodies. | Remember 'Ro' and 'La' as hallmark autoantibodies in Sjögren's. |
| 9 | What is the role of autoantibodies in the pathogenesis of autoimmune rheumatic diseases? | Autoantibodies target self-antigens, forming immune complexes or directly damaging tissues, leading to inflammation and tissue destruction. | Autoantibodies are both markers and mediators of tissue injury. |
| 10 | Why are complement levels useful in monitoring disease activity in SLE? | Because complement consumption correlates with immune complex formation, decreasing levels indicate active disease, while normalization suggests remission. | Complement levels are dynamic markers of disease activity. |
| 11 | What distinguishes the classical pathway from the alternative pathway in terms of activation triggers? | The classical pathway is activated by antibody-antigen complexes, whereas the alternative pathway is activated spontaneously or by pathogen surfaces. | Classical = immune complexes; Alternative = pathogen surfaces. |
| 12 | In which rheumatic disease is complement deficiency most commonly observed, and what is its significance? | Complement deficiency is most associated with increased susceptibility to SLE, as impaired clearance of immune complexes leads to autoimmunity. | Complement deficiency predisposes to immune complex diseases like SLE. |
| 13 | How does complement activation contribute to tissue damage in vasculitis syndromes? | Complement activation promotes recruitment of inflammatory cells and release of enzymes, causing vessel wall inflammation and damage. | Think of complement as a 'charge' that amplifies vessel inflammation. |
| 14 | What is the diagnostic significance of anticardiolipin antibodies in rheumatic disease? | Anticardiolipin antibodies are associated with antiphospholipid syndrome, which predisposes to thrombosis and pregnancy morbidity. | They are key markers in antiphospholipid syndrome. |
| 15 | Can autoantibodies be present in healthy individuals? Give an example. | Yes, for example, low-titer ANA can be found in healthy individuals without disease. | Presence alone doesn't confirm disease; consider titers and clinical context. |
| 16 | What is the role of autoantibodies in differentiating between various rheumatic diseases? | Specific autoantibodies help distinguish diseases; e.g., anti-dsDNA in SLE, anti-CCP in RA, anti-Ro/SSA in Sjögren's. | Autoantibody profiles are disease-specific signatures. |
| 17 | Which complement component is most commonly measured in clinical labs to assess complement activity? | C3 and C4 are most commonly measured to evaluate complement levels and activity. | C3 and C4 levels reflect overall complement consumption. |
| 18 | Describe the mechanism by which immune complexes activate the classical pathway of complement. | Immune complexes formed by autoantibodies and antigens bind C1q, initiating the classical pathway cascade leading to C3 convertase formation. | C1q recognizes antibody-antigen complexes; starts the cascade. |
| 19 | What is the significance of elevated RF in rheumatoid arthritis? | RF is an autoantibody against IgG; its presence supports RA diagnosis but is less specific, as it can be positive in other diseases and healthy individuals. | RF supports but does not confirm RA diagnosis. |
| 20 | Explain why anti-CCP antibodies are considered more specific than RF for RA. | Anti-CCP antibodies have higher specificity because they target citrullinated proteins uniquely associated with RA pathology. | Anti-CCP = more specific 'signature' for RA. |
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