Etiological factors and the role of pathogens
Gram-positive flora, particularly staphylococci and streptococci, play a leading role in the occurrence of severe systemic complications. All gram-positive microbes are capable of secreting protein exotoxins that trigger the pathological process.
- Staphylococcus aureus produces a specific enterotoxin and, more often than other gram-positive pathogens, provokes the development of toxic shock syndrome.
- Lysogenic strains of streptococci produce pyrogenic exotoxin (erythrogenic toxin), which causes scarlet fever and streptococcal toxic shock.
Pathogenetic mechanisms and the action of toxins
Bacterial toxins with superantigen properties are the key factor in the development of the syndrome. They cause powerful and uncontrolled stimulation of the immune system.
- Interaction: Microbial cell wall components activate macrophages and trigger alternative complement pathways.
- Cytokine cascade: There is a massive release of proinflammatory cytokines (including TNF, IL-6, and IL-8).
- Cellular response: Neutrophils are activated, triggering their chemotaxis and adhesion to the endothelium with the release of highly reactive oxygen species ("respiratory burst").
Systemic disorders and outcomes
The body's uncontrolled hyperinflammatory response leads to severe metabolic and circulatory disorders.
- Tissue ischemia develops against the background of hypovolemia and microcirculatory disorders.
- The transition to anaerobic metabolism is accompanied by the accumulation of toxic metabolic products (lactate, creatinine, urea, ketones).
- Multiple organ dysfunction syndrome (MODS) and severe hemodynamic disorders in the form of shock develop.
Staphylococcal and streptococcal superantigens blow up the immune system: the cytokine storm leads to shock faster than protective antibodies can act.
Class and exam questions
Which microorganisms are most commonly associated with the development of toxic shock?
Gram-positive bacteria play the primary role, such as staphylococci (especially Staphylococcus aureus) and streptococci, which secrete specific exotoxins.
How do exotoxins affect the immune system?
Toxins act as superantigens, causing excessive macrophage stimulation, a massive release of proinflammatory cytokines, and the triggering of the systemic inflammatory response syndrome cascade.
What does the progression of systemic disorders in shock lead to?
Deep tissue hypoperfusion, toxemia, and metabolic disorders lead to multiple organ dysfunction and severe hemodynamic disorders.
What else to study on this topic
- Pathogenesis of sepsis and systemic disorders
- Compensatory anti-inflammatory response syndrome (CARS) and immunoparalysis
- Features of gram-negative sepsis and the role of lipopolysaccharide (LPS)
- Action of membrane toxins: streptolysins O and S
- Systemic inflammatory response syndrome (SIRS) diagnostic criteria
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Other topics in the section "Infections of the Integumentary System and Sepsis"
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