Zusammenfassung
Granulozyten von Hühnern besitzen natürlicherweise keine Myeloperoxidase. Sie gleichen darin den bei derAlius-Grignaschi-Anomalie gefundenen menschlichen Granulozyten. Sie können daher phagozytierte Mikroorganismen nicht mit Hilfe von Myeloperoxidase und einem oxidierbaren Kofaktor zerstören, wie es für normale menschliche Granulozyten postuliert wird. Um Einblicke in alternative antimikrobielle Mechanismen von Granulozyten zu erhalten, untersuchten wir die antimikrobiellen Potenzen intakter Hühnergranulozyten in vitro, isolierten ihre Granula, bestimmten den Enzymgehalt dieser Granula und lokalisierten einen antimikrobiellen Mechanismus in diesen Granula. Es zeigte sich:
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1.
Intakte Hühnergranulozyten sind wie menschliche Granulozyten in vitro in der Lage, vier verschiedene Stämme von Mikroorganismen zu phagozytieren und abzutöten.
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2.
Ein antimikrobieller Mechanismus von Hühnergranulozyten konnte in den großen Granula lokalisiert werden.
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3.
Dieser antimikrobielle Mechanismus besteht wahrscheinlich aus 5 basischen Proteinen. Eines dieser basischen Proteine ist Lysozym.
Die anderen konnten bisher nicht als Enzyme definiert werden. Die erhobenen Befunde zeigen, daß neben dem obengenannten antimikrobiellen Mechanismus von Granulozyten alternative Mechanismen bestehen. Bei diesen Alternativmechanismen spielen basische Proteine eine zentrale Rolle. In wieweit diese Befunde zum Verständnis der widersprüchlichen klinischen Beobachtungen an Patienten mit granulozytären Anomalien beitragen können, wird diskutiert.
Summary
Human subjects exhibiting the anomaly described byAlius andGrignaschi lack myeloperoxidase in their neutrophil polymorphonuclear leukocytes (PMN). Chicken heterophile granulocytes naturally lack myeloperoxidase as well. Therefore they must be incapable for killing ingested microorganisms by aid of H2O2, an oxidizable cofactor and myeloperoxidase, a mechanism proposed for human PMN.
To get closer insight into alternative bactericidal mechanisms we chose chicken PMN as a model. We checked the antimicrobial potencies of these cells in vitro, isolated their different classes of granules, determined their enzyme content and localized an antimicrobial mechanism within these granules.
The following results could be established:
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1.
Vital chicken PMN are not inferior to human PMN in respect to their antimicrobial potencies against four strains of microorganisms.
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2.
An antibacterial mechanism was located in the large granules of chicken heterophile PMN.
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3.
Evidently this antibacterial mechanism consists of five or more basic proteins. One of these is lysozyme. Up to now the other proteins could not be shown to be enzymes.
These results prove that there exists an alternative antimicrobial mechanism within PMN. Basic proteins appear to be of central importance for this mechanism. Our results might shed some light upon the controversial observations concerning the antimicrobial potencies of patients exhibiting the anomaly ofAlius andGrignaschi.
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Diese Arbeit wurde mit dem Pappenheim-Preis 1972 der Deutschen Gesellschaft für Hämatologie ausgezeichnet.
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Brune, K. Hühnergranulozyten: Ein Modell für die antimikrobielle Funktion peroxidasefreier menschlicher Granulozyten. Blut 26, 110–126 (1973). https://doi.org/10.1007/BF01635760
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DOI: https://doi.org/10.1007/BF01635760