Lymphokine Stimulated Macrophages Inhibit Intracellular Chlamydia Psittaci Replication by Mechanisms Distinct from Intracellular Inhibition of Toxoplasma Gondii Replication

  • Gerald I. Byrne
  • Henry W. Murray
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 162)


Chlamydia and Toxoplasma are obligate intracellular parasites that replicate within macrophages and other eucaryotic host cells. Although chlamydia are procaryotes and Toxoplasma are eucaryotes, these organisms have several features in common during their intracellular growth and development. Each of these parasites is taken into the host cell by an endocytic mechanism that resembles phagocytosis (1,7), and each subverts normal phagocytic function by inhibiting fusion of host cell lysosomes with parasite-containing vacuoles (3,5). The mechanisms involved in this inhibition are not known, although Eissenberg and Wyrick (2) have reported that inhibition of fusion in peritoneal macrophages challenged with C. psittaci and either Saccharomyces ceriviciae or Escherichia coli was restricted to chlamydiae-containing vesicles. Chlamydiae and Toxoplasma remain within membrane bound vesicles during their entire intracellular development. Toxoplasma replicate by a process called endodyogeny. Chlamydiae first differentiate from a metabolically inactive infective form called an elementary body to an intracellular reticulate body, then grow and divide by binary fission forming a microscopically visible inclusion.


Peritoneal Macrophage Phorbol Myristate Acetate Chlamydia Trachomatis Phorbol Myristate Acetate Toxoplasma Gondii 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Gerald I. Byrne
    • 1
  • Henry W. Murray
    • 1
  1. 1.Cornell University Medical CollegeNew YorkUSA

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