title: Acquired chemotactic inhibitors during infection with guinea pig cytomegalovirus.
abstract: Factors involved in neutrophil and monocyte migrations were serially studied in strain 2 guinea pigs undergoing initial cytomegalovirus infection and sham-inoculated controls. All studies remained unchanged in uninfected animals. Monocyte migrations and neutrophil spontaneous migration remained unchanged in infected animals. However, transient abnormalities occurred early in infection, comprising a decrease in neutrophil-directed migration towards C5-derived chemotactic fractions (C5-fr) and a decrease in the chemotactic activity of zymosan-activated plasma. Consequently, the presence of neutrophil- and chemotaxin-directed inhibitors in plasma was investigated. Normal neutrophils, C5-fr, Escherichia coli-derived bacterial factor, and the synthetic peptide F-met-leu-phe were first incubated with control or infected plasmas and then assayed for directed migration and lysosomal enzyme release. Results indicated the de novo appearance of both neutrophil- and chemotaxin-directed inhibitory activities in plasma during early infection. The neutrophil-directed inhibition was heat stable (56 degrees C for 120 min) and nonspecific (responses to all chemotaxins were inhibited). The chemotaxin-directed inhibition was heat stable and C5-fr specific. The cytomegalovirus-induced inhibitors may be important in the enhanced susceptibility to concurrent opportunistic infections.
mesh_terms: D000818:Animals; D002630:Chemotactic Factors / Q000037:antagonists & inhibitors*; D002634:Chemotaxis, Leukocyte; D003586:Cytomegalovirus Infections / Q000097:blood* / Q000382:microbiology; D006168:Guinea Pigs; D006358:Hot Temperature; D008222:Lymphokines / Q000097:blood*; D008297:Male; D009000:Monocytes / Q000502:physiology; D009504:Neutrophils / Q000502:physiology; D014766:Viremia
chemical_list: D002630:Chemotactic Factors; D008222:Lymphokines; C034397:chemotactic inhibitory factor