Skip to main content
Infection and Immunity logoLink to Infection and Immunity
. 1978 Feb;19(2):607–612. doi: 10.1128/iai.19.2.607-612.1978

Kinetics of phagocytosis of Chlamydia psittaci by mouse fibroblasts (L cells): separation of the attachment and ingestion stages.

G I Byrne
PMCID: PMC414126  PMID: 631892

Abstract

The kinetics of phagocytosis of Chlamydia psittaci (6BC) by monolayers of mouse fibroblasts (L cells) was studied with an assay that distinguished between the attachment and ingestion phases of phagocytosis. At multiplicities of 10 and 100 50% infectious doses (ID50) per L cell, virtually all of the inoculated C. psittaci had been attached and ingested after 60 min at 37 degrees C. At multiplicities of 500 to 5,000 ID50 per L cell, the initial rates of attachment and ingestion of C. psittaci to L cells increased with the multiplicity of infection, but phagocytosis stopped even though many chlamydial cells remained free in suspension and readily available for attachment to the host-cell monolayers. Phagocytosis probably ceased because the L cells were injured when they took up large numbers of chlamydial cells. This injury prevented direct determination of the number of potential binding sites for C. psittaci on each L cell. However, this number is large enough to make the rates of chlamydial attachment and ingestion predominantly dependent on the multiplicity of infection.

Full text

PDF
607

Images in this article

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. BOVARNICK M. R., MILLER J. C. Oxidation and transamination of glutamate by typhus rickettsiae. J Biol Chem. 1950 Jun;184(2):661–676. [PubMed] [Google Scholar]
  2. Byrne G. I., Moulder J. W. Parasite-specified phagocytosis of Chlamydia psittaci and Chlamydia trachomatis by L and HeLa cells. Infect Immun. 1978 Feb;19(2):598–606. doi: 10.1128/iai.19.2.598-606.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Byrne G. I. Requirements for ingestion of Chlamydia psittaci by mouse fibroblasts (L cells). Infect Immun. 1976 Sep;14(3):645–651. doi: 10.1128/iai.14.3.645-651.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. DULBECCO R., VOGT M. Plaque formation and isolation of pure lines with poliomyelitis viruses. J Exp Med. 1954 Feb;99(2):167–182. doi: 10.1084/jem.99.2.167. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Friis R. R. Interaction of L cells and Chlamydia psittaci: entry of the parasite and host responses to its development. J Bacteriol. 1972 May;110(2):706–721. doi: 10.1128/jb.110.2.706-721.1972. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Hatch T. P. Competition between Chlamydia psittaci and L cells for host isoleucine pools: a limiting factor in chlamydial multiplication. Infect Immun. 1975 Jul;12(1):211–220. doi: 10.1128/iai.12.1.211-220.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Kaplan G., Gaudernack G., Seljelid R. Localization of receptors and early events of phagocytosis in the macrophage. Exp Cell Res. 1975 Oct 15;95(2):365–375. doi: 10.1016/0014-4827(75)90562-5. [DOI] [PubMed] [Google Scholar]
  8. Kellogg K. R., Horoschak K. D., Moulder J. W. Toxicity of low and moderate multiplicities of Chlamydia psittaci for mouse fibroblasts (L cells). Infect Immun. 1977 Nov;18(2):531–541. doi: 10.1128/iai.18.2.531-541.1977. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Moulder J. W., Hatch T. P., Byrne G. I., Kellogg K. R. Immediate toxicity of high multiplicities of Chlamydia psittaci for mouse fibroblasts (L cells). Infect Immun. 1976 Jul;14(1):277–289. doi: 10.1128/iai.14.1.277-289.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Rabinovitch M. The dissociation of the attachment and ingestion phases of phagocytosis by macrophages. Exp Cell Res. 1967 Apr;46(1):19–28. doi: 10.1016/0014-4827(67)90405-3. [DOI] [PubMed] [Google Scholar]
  11. Stossel T. P. Phagocytosis: recognition and ingestion. Semin Hematol. 1975 Jan;12(1):83–116. [PubMed] [Google Scholar]

Articles from Infection and Immunity are provided here courtesy of American Society for Microbiology (ASM)

RESOURCES