title: Human phagocytic cells in the early innate immune response to Borrelia burgdorferi.
abstract: During natural infection with the agent of Lyme disease, Borrelia burgdorferi, polymorphonuclear leukocytes (PMNL) are the first cells of the innate immune system to arrive at the site of spirochete deposition in the skin. This study examined the degree of spirochete clearance likely to occur with PMNL or mononuclear cells before the development of the secondary immune response. Without specific antibody in vitro, there was very limited uptake of spirochetes by PMNL or monocytes and no intracellular colocalization of PMNL granule products with spirochetes. Most of the killing of spirochetes by PMNL was extracellular. In contrast, mature macrophages ingest and kill spirochetes avidly with or without specific antibody. Once the spirochetes are opsonized, PMNL clear them rapidly. These findings may be relevant to the initial survival of spirochetes introduced into the host.
authors.affiliation: Department of Internal Medicine, Yale University School of Medicine, 333 Cedar Street/LCI 608, New Haven, CT 06520-8031, USA. Ruth.montgomery@yale.edu
authors.forename: Ruth R
authors.initials: RR
authors.lastname: Montgomery
authors.forename: Denise
authors.initials: D
authors.lastname: Lusitani
authors.forename: Anne
authors.initials: A
authors.lastname: de Boisfleury Chevance
authors.forename: Stephen E
authors.initials: SE
authors.lastname: Malawista
mesh_terms: D025065:Borrelia burgdorferi / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D006801:Humans; D007111:Immunity, Cellular; D007962:Leukocytes / Q000276:immunology; D008193:Lyme Disease / Q000276:immunology*; D009000:Monocytes / Q000276:immunology; D010586:Phagocytes / Q000276:immunology*