%0 Journal Article %A Zvillich, Menachem %A Sarov, Israel %T Interaction between Human Polymorphonuclear Leucocytes and Chlamydia trachomatis Elementary Bodies: Electron Microscopy and Chemiluminescent Response %D 1985 %J Microbiology, %V 131 %N 10 %P 2627-2635 %@ 1465-2080 %R https://doi.org/10.1099/00221287-131-10-2627 %I Microbiology Society, %X Summary: Incubation of human polymorphonuclear leucocytes (HPMN) with highly purified Chlamydia trachomatis serotype L2/434/Bu elementary bodies (EB), in the presence and absence of specific antibody, resulted in a 103-fold reduction of viable count after 24 h incubation. Electron microscopy observations indicated activation of the HPMN by the EB. Attachment of the EB to the HPMN cell membrane, formation of a cytoplasmic cup and EB-containing vacuoles were observed. In addition, two types of phagocytic vacuoles were observed after 30 min incubation; in one type, a single EB was tightly surrounded by the vacuolar membrane, while the other type was enlarged and held one or more intact EB or degenerated EB or both. A fuzzy coat was observed on EB located in the HPMN vacuoles only in the presence of specific antibody. Empty vacuoles containing degenerated EB were observed in the HPMN after 24 h incubation. HPMN exposed to EB of C. trachomatis produced a marked chemiluminescent response with a peak 14 times greater than the peak value of the control. A second stimulation with phorbol 12-myristate 13-acetate and zymosan was achieved. The chemiluminescent peak value in the presence of heat-treated EB (56 °C. 20 min) was 50% of that obtained in the presence of untreated EB. The significance of the chemiluminescent response in the killing mechanism of C. trachomatis EB by HPMN is discussed. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-131-10-2627