Zusammenfassung
Infektionen und Traumata, einschließlich operativer Eingriffe, rufen eine systemische inflammatorische Antwort des Organismus hervor. Diese Immunantwort muss fein abgestimmt und genau geregelt werden, da sowohl eine zu geringe als auch eine überschießende Reaktion zu einer erhöhten Mortalität führen kann. Aktivierte Rezeptoren des angeborenen Immunsystems („pattern-recognition receptors“, PRRs) erkennen sog. „damage-associated molecular patterns“ (DAMPs), d. h. spezifische Strukturmotive exogener Pathogene („pathogen-associated molecular patterns“, PAMPs) und endogener zelldebrisassoziierter Pathogene (Alarmine), und können dabei zu einer überschießenden Immunantwort führen. Letztere ist durch ein komplexes Wechselspiel von Zytokinen und Chemokinen, amplifizierende Interaktionen der Gerinnungs-, Komplement- und Entzündungskaskade sowie die Kommunikation von Zellen des angeborenen und erworbenen Immunsystems charakterisiert. Das pathophysiologische Hauptereignis bei der Sepsis ist der Übergang vom anfänglichen hyperentzündlichen Zustand in die Immunparalyse und die zelluläre Anergie mit einer hohen Suszeptibilität der Patienten für sekundäre Infektionen und protrahierte Organschäden. Eine mit dem chirurgischen Trauma per se verbundene Immundysfunktion erhöht das Risiko einer Sepsis mit einem aggravierten Verlauf. Die Immunosuppression wird durch die massive Apoptose von Lymphozyten und dendritischen Zellen, die reduzierte HLA-DR-Expression und das verstärkte Vorliegen von negativ kostimulatorischen Molekülen vermittelt. Neben der Zunahme der T-Zellzahl kommt es zur Verschiebung vom entzündlichen Th1-Phänotyp zu einem antiinflammatorischen Th2-Phänotyp mit der Produktion von Interleukin-10. Weitere Schlüsselmediatoren der Sepsis sind HMGB1, MIF und der Komplementfaktor C5a. Durch die Identifizierung zentraler pathomechanistischer Ereignisse, wie z. B. die Immundysbalance, die Neuroimmunmodulation über den cholinergen antiinflammatorischen Reflex und die komplexe Interaktion von Gerinnung, Entzündung und Komplementkaskade besteht jetzt die Möglichkeit, neuartige Therapeutika zu entwickeln, welche eher die Modulation und weniger die Inhibition der Wirtsreaktion zum Ziel haben.
Abstract
Infection or injury, including surgical procedures, induces an inflammatory response of the host organism. This immune response must be finely tuned and precisely regulated, because deficiencies or excesses of the inflammatory response cause morbidity and shorten the lifespan. Activated receptors of the innate immune system (pattern recognition receptors, PRRs), which recognize pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs) including injured tissue-associated intracellular proteins (alarmins), lead to an exaggerated immune response. This is characterized by a complex interplay of cytokines, chemokines, complement and coagulation factors as well as inflammatory and immune regulatory cells. There is increasing recognition that the major pathophysiologic event in sepsis is the progression from the initial hyperinflammatory state to an immunosuppressive state in which the host is unable to eradicate invading pathogens and particularly prone to develop secondary nosocomial infections and organ damage. Surgical trauma-associated immune dysfunction per se predisposes the host to surgery-related sepsis. Immune suppression is mediated by massive apoptosis-induced depletion of lymphocytes and dendritic cells, decreased expression of the cell surface antigen complex HLA-DR and increased expression of negative costimulatory molecules. Besides increased numbers of regulatory T cells there is a shift from a phenotype of inflammatory Th1 cells to an antiinflammatory phenotype of Th2 cells characterized by the production of interleukin-10. Key mediators of sepsis are HMGB1, MIF and complement factor C5a. With the identification of central pathomechanistic events, e.g. amplification of the coagulation, complement and inflammation cascades, immune dysbalance and neuroimmunomodulation via the cholinergic anti-inflammatory reflex, the opportunity now exists to apply these insights to the development of new and novel therapeutics aimed at modulating rather than inhibiting the systemic host response to infection.
Abbreviations
- AT-III:
-
Antithrombin-III
- BTLA:
-
B- and T-lymphocyte attenuator
- CARS:
-
compensatory anti-inflammatory response syndrome
- COX-2:
-
Cyclooxygenase-2
- CTLA-4:
-
cytotoxic T-lymphocyte-associated antigen-4
- DAMPs:
-
damage-associated molecular patterns
- DIG:
-
disseminierte intravaskuläre Gerinnung
- HMGB1:
-
high mobility group B1 protein
- IFN-γ:
-
Interferon-γ
- IL-1β:
-
Interleukin-1β
- iNOS:
-
induzierbare NO-Synthase
- MAC:
-
membrane attacking complex
- MBL:
-
mannose-binding lectin
- MIF:
-
macrophage migration inhibiting factor
- MyD 88:
-
myeloid differentiation factor 88
- NFκB:
-
nuclear factor kappa B
- NOD2:
-
nucleotide-binding oligomerization domain containing 2
- PAF:
-
plättchenaktivierender Faktor
- PAI-1:
-
Plasminogenaktivatorinhibitor-1
- PAMPs:
-
pathogen-associated molecular patterns
- PD-1:
-
programmed death-1
- PD-L1:
-
PD-1 ligand
- PIRO:
-
Prädisposition, Infektion, Reaktion und Organfunktion
- PRRs:
-
pattern-recognition receptors
- RAGE:
-
receptor for advanced glycation endproducts
- SIRS:
-
systemic inflammatory response syndrome
- SNPs:
-
single nucleotide polymorphisms
- sRAGE:
-
soluble receptor for advanced glycation endproducts
- sTREM-1:
-
soluble triggering receptor expressed on myeloid cells
- TAFI:
-
thrombinaktivierbarer Fibrinolyseeinhibitor
- TF:
-
tissue factor
- TLRs:
-
Toll-like-Rezeptoren
- TNF-α:
-
Tumornekrosefaktor-α
- t-PA:
-
Gewebeplasminogenaktivator
- vWF:
-
von Willebrand Faktor
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Die Autorin dankt Frau Anja Gellert für die Unterstützung bei der Erstellung der Abbildungen und Herrn Dr. rer. nat. Christian Eipel für die kritische Durchsicht des Manuskriptes.
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Vollmar, B. Pathophysiologische Grundlagen der chirurgisch-bedingten Sepsis. Chirurg 82, 199–207 (2011). https://doi.org/10.1007/s00104-010-2010-7
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DOI: https://doi.org/10.1007/s00104-010-2010-7