title: Apoptotic cell clearance in chronic inflammation of lateral neck cysts.
abstract: The mechanism driving accumulation of large numbers of apoptotic and necrotic neutrophils in inflamed lateral neck cysts (LNC), in the absence of infection, remains obscure. The cellular content of cysts obtained from 17 patients was co-cultured with human macrophages. Phagocytosis levels of cyst-derived neutrophils were determined and compared to the uptake of spontaneously apoptotic neutrophils. Simultaneously, the expression of cytokines in macrophages exposed to cyst contents was measured. In comparison to spontaneously apoptotic neutrophils, the phagocytosis of LNC-derived neutrophils by macrophages was inefficient. An inverse correlation between neutrophil content in LNC and their uptake was observed. Macrophages co-cultured with cyst contents responded with variable expression of IL-6, TNF-α and IL-10. The hindered clearance of apoptotic neutrophils in LNC may lead to secondary necrosis of these cells and stimulation of the inflammatory reaction. Together with local production of anti-inflammatory cytokines, this may fuel chronic inflammation in the cysts.
authors.affiliation: Department of Otolaryngology, Regional Hospital, ul. Lwowska 178A, 33-100, Tarnow, Poland.
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Dobros
authors.forename: Karolina
authors.initials: K
authors.lastname: Burda
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Guzik
authors.forename: Joanna
authors.initials: J
authors.lastname: Koziel
authors.forename: Jan
authors.initials: J
authors.lastname: Potempa
mesh_terms: D017209:Apoptosis; D001707:Biopsy, Needle; D002478:Cells, Cultured; D002908:Chronic Disease; D003560:Cysts / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D016207:Cytokines / Q000096:biosynthesis / Q000235:genetics; D005786:Gene Expression Regulation; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D008264:Macrophages / Q000378:metabolism / Q000473:pathology; D009333:Neck / Q000473:pathology; D009504:Neutrophils / Q000378:metabolism / Q000473:pathology*; D010587:Phagocytosis; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D012189:Retrospective Studies
chemical_list: D016207:Cytokines; D012333:RNA, Messenger