title: Unidirectional heterologous receptor desensitization between both the fMLP and C5a receptor and the IL-8 receptor.
abstract: During inflammation neutrophils receive multiple signals that are integrated, allowing a single modified response. One mechanism for this discrimination is receptor desensitization, a process whereby ligand-receptor binding is disassociated from cell activation. We examined the effect of heterologous receptor desensitization on neutrophil chemotaxis, calcium mobilization, and arachidonic acid production, using interleukin-8 (IL-8), C5a, and N-formyl-methionyl-leucyl-phenylalanine (fMLP). We observed reciprocal inhibition with respect to chemotaxis. We demonstrated that homologous desensitization, with respect to the mobilization of intracellular calcium stores, lasted approximately 15 min. Heterologous desensitization between the fMLP receptor and the C5a receptor was reciprocal; either stimulant would diminish the cells' response to stimulation by the other for approximately 3-5 min. However, we observed a unidirectional heterologous desensitization of the IL-8 receptor by both the fMLP and the C5a receptor. This unidirectional heterologous desensitization was observed with respect to both calcium mobilization and arachidonic acid production (i.e., prestimulation of the IL-8 receptor had no effect on subsequent stimulation by either fMLP or C5a).
authors.affiliation: Department of Pediatrics, Division of Infectious Diseases, University of Michigan, Ann Arbor, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Blackwood
authors.forename: K T
authors.initials: KT
authors.lastname: Hartiala
authors.forename: E E
authors.initials: EE
authors.lastname: Kwoh
authors.forename: A T
authors.initials: AT
authors.lastname: Transue
authors.forename: R C
authors.initials: RC
authors.lastname: Brower
mesh_terms: D015703:Antigens, CD / Q000187:drug effects / Q000502:physiology*; D002118:Calcium / Q000097:blood*; D002634:Chemotaxis, Leukocyte; D015936:Complement C5a / Q000494:pharmacology* / Q000502:physiology; D006801:Humans; D066298:In Vitro Techniques; D016209:Interleukin-8 / Q000494:pharmacology*; D007700:Kinetics; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D044087:Receptor, Anaphylatoxin C5a; D011951:Receptors, Complement / Q000187:drug effects / Q000502:physiology*; D018123:Receptors, Interleukin / Q000187:drug effects / Q000502:physiology*; D023062:Receptors, Interleukin-8A
chemical_list: D015703:Antigens, CD; D016209:Interleukin-8; D044087:Receptor, Anaphylatoxin C5a; D011951:Receptors, Complement; D018123:Receptors, Interleukin; D023062:Receptors, Interleukin-8A; D009240:N-Formylmethionine Leucyl-Phenylalanine; D015936:Complement C5a; D002118:Calcium