Chlamydia trachomatis-induced production of interleukin-1 by human monocytes

C. D. Rothermel, J. Schachter, P. Lavrich, Evan C. Lipsitz, T. Francus

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Human diseases caused by the intracellular bacterium Chlamydia trachomatis include genital tract infections and blinding trachoma. Chlamydial infections are characterized by chronic inflammation and scarring, and development of such complications is thought to be immunologically mediated. In this study, we show that coculture of C. trachomatis (serovar L2) with human blood monocytes induced the production of interleukin-1 (IL-1), an important mediator of inflammation, tissue remodeling, and scarring. IL-1 was produced in response to UV-inactivated elementary bodies containing from 0.1 to 50 μg of protein per ml, with a maximal response at 5 to 10 μg/ml. IL-1 activity was detected by 6 h of incubation and was maximal by 24 h. Peak levels were maintained throughout 96 h of incubation. Rabbit antibody to human IL-1(α+β) effectively neutralized the thymocyte-stimulating activity of the supernatants. The apparent molecular weight of chlamydia-induced IL-1 was 16,000, as determined by gel filtration on a Bio-Gel P-60 column. Isoelectric focusing yielded two peaks of activity, with pIs of 5.5 and 6.9. Neutralization studies with antisera against human IL-1α and IL-1β showed that the acidic and neutral peaks corresponded to IL-1α and IL-1β, respectively, with IL-1β predominating. Heat-killed chlamydiae, which are not internalized by monocytes, were effective IL-1 inducers, indicating that phagocytosis was not required for IL-1 induction. Purified C. trachomatis lipopolysaccharide was also an effective IL-1 inducer, suggesting that the response to intact organisms may be largely a response to chlamydial lipopolysaccharide. Finally, purified chlamydial major outer membrane protein induced low but detectable IL-1 activity.

Original languageEnglish (US)
Pages (from-to)2705-2711
Number of pages7
JournalInfection and Immunity
Volume57
Issue number9
StatePublished - 1989
Externally publishedYes

Fingerprint

Chlamydia trachomatis
Interleukin-1
Monocytes
Chlamydia
Cicatrix
Lipopolysaccharides
Reproductive Tract Infections
Trachoma
Inflammation Mediators
Isoelectric Focusing
Thymocytes
Coculture Techniques
Phagocytosis
Gel Chromatography
Immune Sera
Membrane Proteins

ASJC Scopus subject areas

  • Immunology

Cite this

Rothermel, C. D., Schachter, J., Lavrich, P., Lipsitz, E. C., & Francus, T. (1989). Chlamydia trachomatis-induced production of interleukin-1 by human monocytes. Infection and Immunity, 57(9), 2705-2711.

Chlamydia trachomatis-induced production of interleukin-1 by human monocytes. / Rothermel, C. D.; Schachter, J.; Lavrich, P.; Lipsitz, Evan C.; Francus, T.

In: Infection and Immunity, Vol. 57, No. 9, 1989, p. 2705-2711.

Research output: Contribution to journalArticle

Rothermel, CD, Schachter, J, Lavrich, P, Lipsitz, EC & Francus, T 1989, 'Chlamydia trachomatis-induced production of interleukin-1 by human monocytes', Infection and Immunity, vol. 57, no. 9, pp. 2705-2711.
Rothermel CD, Schachter J, Lavrich P, Lipsitz EC, Francus T. Chlamydia trachomatis-induced production of interleukin-1 by human monocytes. Infection and Immunity. 1989;57(9):2705-2711.
Rothermel, C. D. ; Schachter, J. ; Lavrich, P. ; Lipsitz, Evan C. ; Francus, T. / Chlamydia trachomatis-induced production of interleukin-1 by human monocytes. In: Infection and Immunity. 1989 ; Vol. 57, No. 9. pp. 2705-2711.
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