Zusammenfassung
Grundlagen: Das klinische Zustandsbild des septischen Schocks wird ursächlich durch eine übersteigerte Produktion pro-inflammatorischer Zytokine (TNF-α, IL-1β) von Entzündungszellen des Körpers hervorgerufen. Der Einsatz von monoklonalen Antikörpern (anti-TNF-α), Rezeptor-Antagonisten (IL1-rα) und anti-inflammatorischen Zytokinen (IL-10) in einer Reihe klinischer Studien führte großteils nicht zur erwarteten Steigerung der Überlebensrate bei septischen Patienten. Dies ist einerseits auf die geringe Halbwertszeit dieser Antagonisten bzw. Inhibitoren zurückzuführen, andererseits kann eine übersteigerte Produktion pro-inflammatorischer Zytokine zwar zu Pathologien in einem Kompartiment des Körpers beitragen, während dieselben Mediatoren jedoch auch kurative Eigenschaften in anderen Kompartimenten besitzen können. Die systemische Verabreichung, die in ausreichend hoher Konzentration erfolgen muß, kann somit auch die positiven Effekte einer pro-inflammatorischen Immunatwort unterdrücken.
Methodik: Die eigenen tierexperimentellen Ergebnisse zum Liposomen-mediierten Gentransfer werden vorgestellt.
Ergebnisse: Die Möglichkeit, Inhibitoren oder Antagonisten pro-inflammatorischer Zytokine in hoher Dosis ausschließlich lokal an den Ort einer Entzündung zu transportieren, läßt den Liposomen-mediierten Gentransfer als eine vielversprechende und risikoarme Alternative zur konservativen systemischen anti-inflammatorischen Therapie der Sepsis erscheinen.
Schlußfolgerungen: Der pathophysiologische Mechanismus der Sepsis und des septischen Schocks ist in der Zwischenzeit gut erforscht und akzeptiert. Das Konzept der Intervention in diesem pathophysiologischen Ablauf im Sinne einer Mediatorblockade kann in Zukunft nur auf lokaler Gewebs- und Kompartimentebene im Bereich der überschießenden delitären Mediatorproduktion erfolgreich sein.
Schlüsselwörter: Septischer Schock, Gentransfer, Liposomen, pro-inflammatorische Antwort, antiinflammatorische Antwort
Summary
Background: It is now generally accepted that over-production of pro-inflammatory cytokines (TNF-α, IL-1β) produced by inflammatory cells contributes to the pathological consequences of septic shock. Neutralizing this exaggerated immune response by monoclonal antibodies (anti-TNF-α), receptor antagonists (IL-1rα) and anti-inflammatory cytokines (IL-10) did not result in a better outcome in septic patients. Firstly, this is due to the short biological half-lives of these natural antagonists or inhibitors of pro-inflammatory cytokines. Secondly, exaggerated pro-inflammatory cytokine production may contribute to pathology in one body compartment while, simultaneously, the same mediators may have beneficial effects in another compartment. Thus, systemic administration of cytokine inhibitors at levels sufficient to neutralize exaggerated cytokine production in one organ may also block the presumably beneficial aspects of cytokine production in another.
Methods: Our own results of animal experiments of the liposome mediated gene transfer are presented.
Results: Liposome mediated gene transfer seems to be a promising low-risk alternative to systemic anti-inflammatory therapies as it ensures the local delivery of high doses of cytokine inhibitors and antagonists over a prolonged period of time.
Conclusions: The pathophysiological mechanism of sepsis and septic shock are well established. The concept of local intervention or compartimental blockade of overwhelming mediator production by gene transfer will be a new challenge in the future.
Keywords: Septic shock, gene transfer, liposomes, pro-inflammatory response, anti-inflammatory response
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