Role of the C terminus of the interleukin 8 receptor in signal transduction and internalization

Gregory N. Prado, Hiroyuki Suzuki, Nancy Wilkinson, Beth Cousins, Javier Navarro

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Abstract

Interleukin 8 (IL-8) is a potent neutrophil chemoattractant and activator. Two IL-8 receptor subtypes, A and B, are expressed in neutrophils. In this work, we analyzed the role of the C terminus domain of the IL-8 receptor on the signal transduction and receptor internalization mechanisms. The IL-8 receptor A was tagged with an epitope corresponding to the monoclonal antibody 1D4 to monitor the localization of the IL-8 receptor. We demonstrated IL-8-dependent receptor internalization by monitoring the density of surface 125I-labeled IL-8 binding sites and by immunofluorescence microscopy. Truncation of the last 27 amino acids of the IL-8 receptor A severely impaired the IL-8-induced internalization of the receptor. Of importance was the observation that binding of IL-8 to receptors A and B triggered a dramatically faster rate of internalization of receptor B than receptor A, suggesting that the heterologous C termini among receptor subtypes modulate the rate of internalization of IL-8 receptors. However, substitution of the C terminus of the receptor subtype A for the C terminus of receptor B reduced the internalization rate of receptor A. Furthermore, we found that the rate of internalization of IL-8 receptor B triggered by IL-8 was faster than the one induced by the IL-8-related peptide, melanoma growth stimulatory activity. Studies with human neutrophils pretreated with 100 nM IL-8 for 5 min revealed a positive and a negative calcium response mediated by receptors A and B, respectively. In contrast, neutrophils pretreated with melanoma growth stimulatory activity showed positive calcium responses to both receptors A and B. These data suggest that the neutrophil responses mediated by IL-8 are modulated by the rate of internalization of receptors.

Original languageEnglish
Pages (from-to)19186-19190
Number of pages5
JournalJournal of Biological Chemistry
Volume271
Issue number32
DOIs
StatePublished - 1996

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Interleukin-8 Receptors
Signal transduction
Interleukin-8
Signal Transduction
Neutrophils
Melanoma
Interleukin-8B Receptors
Calcium
Chemotactic Factors
Interleukin-5
Growth
Fluorescence Microscopy
Epitopes
Binding Sites
Monoclonal Antibodies
Microscopic examination
Substitution reactions
Amino Acids
Peptides

ASJC Scopus subject areas

  • Biochemistry

Cite this

Role of the C terminus of the interleukin 8 receptor in signal transduction and internalization. / Prado, Gregory N.; Suzuki, Hiroyuki; Wilkinson, Nancy; Cousins, Beth; Navarro, Javier.

In: Journal of Biological Chemistry, Vol. 271, No. 32, 1996, p. 19186-19190.

Research output: Contribution to journalArticle

Prado, Gregory N. ; Suzuki, Hiroyuki ; Wilkinson, Nancy ; Cousins, Beth ; Navarro, Javier. / Role of the C terminus of the interleukin 8 receptor in signal transduction and internalization. In: Journal of Biological Chemistry. 1996 ; Vol. 271, No. 32. pp. 19186-19190.
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