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498
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+1024 години
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+6530 днів
Архів дописів
498
Intracellular bacteria → IL-12 → NK cells → IFN-γ → Macrophage activation.
Most important adaptive response:
Th1-mediated immunity.
Most important cytokine:
IFN-γ.
Most important lesion:
Granuloma.
Classic granulomatous disease:
Tuberculosis.
Tuberculosis causes granulomatous inflammation due to persistent activation of macrophages and Th1 cells.
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⚠️ MCQ ALERT
Major protective immunity against extracellular bacteria = Humoral immunity.
Most important cells = Neutrophils.
Most important molecules = Antibodies and complement.
Antibodies neutralize toxins and activate complement.
C3b = Opsonization.
C5b-9 = Microbial lysis.
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⭐️ MCQ
TNF-α → fever, septic shock, cachexia.
TNF-β → lymphotoxin from activated T cells.
IFN-α and IFN-β → antiviral cytokines.
IFN-γ → strongest macrophage activator.
G-CSF → neutrophils.
GM-CSF → neutrophils + monocytes.
EPO → RBC production.
498
Repost from N/a
🧩 The Cytokine Kingdom
🔹👑 TNF-α = The Fire Alarm
🔹Starts inflammation
🔹Causes fever
🔹Causes septic shock
🔹Causes cachexia
🧠 Memory:
🔹A = Alarm
⸻
🔹⚔️ TNF-β = The Assassin
🔹Made by activated T cells
🔹Kills target cells
🔹Lymphotoxin
🧠 Memory:
🔹B = Blade
⸻
🔹🦠 IFN-α = Anti-Virus Soldier
🔹Produced by virus-infected cells
🔹Protects neighboring cells
🧠 Memory:
🔹Alpha interferon = Already infected cell
⸻
🔹🛡️ IFN-β = Bodyguard
🔹Produced mainly by fibroblasts
🔹Antiviral defense
🧠 Memory:
🔹Beta interferon = Backup antiviral
⸻
🔹👮 IFN-γ = General of Macrophages
🔹Activates macrophages
🔹Increases MHC expression
🔹Important for intracellular pathogens
🧠 Memory:
🔹Gamma = General
⸻
🔹🩸 G-CSF = Granulocyte Factory
🔹Increases neutrophils
🧠 Memory:
🔹G = Granulocytes
⸻
🔹🏭 GM-CSF = Bigger Factory
🔹Granulocytes + Monocytes
🧠 Memory:
🔹GM = Granulocytes + Monocytes
⸻
🔹🚑 EPO = Red Blood Cell Builder
🔹Stimulates RBC production
🧠 Memory:
🔹EPO = Erythrocytes
⸻
🔹👑 Ultimate Exam Memory
🔹🔥 TNF-α = Alarm
🔹⚔️ TNF-β = Blade
🔹🦠 IFN-α = Antiviral
🔹🛡️ IFN-β = Backup antiviral
🔹👮 IFN-γ = General (macrophages)
🔹🩸 G-CSF = Granulocytes
🔹🏭 GM-CSF = Granulocytes + Monocytes
🔹❤️ EPO = Erythrocytes
🔹🔪 Killer memory:
🔹Alarm → Blade → Antiviral → Backup → General → Granulocytes → Granulocytes+Monocytes → Erythrocytes
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👑 EXTRACELLULAR BACTERIA
🔹Main defense:
🪽 Antibodies + Complement + Neutrophils
🔹High-yield complement facts:
🪽 C5a → attracts neutrophils
🪽 C3b → opsonization
🪽 C5b-9 → MAC (bacterial lysis)
🔹Inflammation:
🪽 C3a/C5a → histamine release → edema + erythema
🔹Examples:
🪽 Staphylococcus aureus
🪽 Streptococcus pyogenes
🔹Remember:
🪽 Extracellular = Antibodies can reach them
🪽 Intracellular = T cells & macrophages needed
🔹🔪 Memory:
🪽 C5a CALLS, C3b COATS, C5b-9 KILLS.
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🚨 MCQ ALERT
Extracellular bacteria do NOT invade cells.
Major defense = Antibodies + Complement + Neutrophils.
Major mechanisms of disease = Inflammation + Toxin production.
Capsulated bacteria: Streptococci, Neisseria, Staphylococci.
Major host injury = Inflammation and septic shock.
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🚨 MCQ ALERT
Pyogenic bacteria → extracellular bacteria → antibodies, complement, neutrophils.
Tuberculosis → intracellular bacterium → macrophages + CD4 T cells.
Granuloma formation is characteristic of intracellular pathogens.
Neutrophils are the major cells in pyogenic bacterial infections.
