Chlamydia pneumoniae Multiply in Neutrophil Granulocytes and Delay Their Spontaneous Apoptosis

Ger Van Zandbergen*, Jens Gieffers, Henning Kothe, Jan Rupp, Annalena Bollinger, Eresso Aga, Matthias Klinger, Helmut Brade, Klaus Dalhoff, Matthias Maass, Werner Solbach, Tamás Laskay

*Korrespondierende/r Autor/-in für diese Arbeit
111 Zitate (Scopus)


The obligate intracellular bacterial pathogen Chlamydia pneumoniae (Cp) is responsible for a range of human diseases, including acute respiratory infection. Although experimental intratracheal infection with Cp results in a massive recruitment of neutrophil granulocytes (polymorphonuclear neutrophils (PMN)), the role of these cells in the defense against Cp is unclear. In this study the interactions of PMN with Cp were investigated. In vitro coincubation experiments showed that human granulocytes were able to internalize Chlamydia in an opsonin-independent manner. Importantly, phagocytosed Cp were not killed; the ingested bacteria survived and multiplied within PMN. Although uninfected granulocytes became apoptotic within 10 h, infected PMN survived up to 90 h. Coincubation with Cp significantly decreased the ratio of apoptotic PMN, as detected by morphological analysis, annexin V, and TUNEL staining. The observed antiapoptotic effect was associated with a markedly lower level of procaspase-3 processing and, consequently, reduced caspase-3 activity in infected PMN. LPS was found as a major, but not exclusive, component responsible for the observed antiapoptotic effect. Chlamydia LPS affected PMN apoptosis both by acting directly on the cells and by inducing the autocrine production of the antiapoptotic cytokine IL-8. These data show that, in contrast to other microbial pathogens that drive phagocytes into apoptosis to escape killing, Cp can extend the life span of neutrophil granulocytes, making them suitable host cells for survival and multiplication within the first hours/days after infection.

ZeitschriftJournal of Immunology
Seiten (von - bis)1768-1776
PublikationsstatusVeröffentlicht - 01.02.2004

Strategische Forschungsbereiche und Zentren

  • Forschungsschwerpunkt: Infektion und Entzündung - Zentrum für Infektions- und Entzündungsforschung Lübeck (ZIEL)


Untersuchen Sie die Forschungsthemen von „Chlamydia pneumoniae Multiply in Neutrophil Granulocytes and Delay Their Spontaneous Apoptosis“. Zusammen bilden sie einen einzigartigen Fingerprint.