Mature dendritic cells respond to SDF-1, but not to several β-chemokines

Elena Delgado, Victoria Finkel, Marco Baggiolini, Charles R. Mackay, Ralph M. Steinman, Angela Granelli-Piperno

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74 Citations (Scopus)

Abstract

Immature dendritic cells (DCs) are highly motile, but after differentiation they stop migration. Chemokines are chemotactic cytokines that direct leukocyte trafficking, therefore we looked for the expression and function of chemokine receptors in immature and mature DCs. As a model, we used the human DCs that develop from CD14+ peripheral blood monocytes cultured with GM-CSF and IL-4. After 6-7 days in culture, these cells have the characteristics of immature DCs, but can be induced to mature further by inflammatory stimuli or by monocyte conditioned medium (MCM). Immature DCs express mRNA for CXCR4, CCR3 and CCR5. The receptors are expressed on the cell surface, as assessed with monoclonal antibodies, and are functional (with the exception of CCR3) as assessed by CA++ mobilization in response to specific chemokines. Further differentiation and maturation of DC in MCM causes a downregulation of expression and function of the β-chemokine receptors, while CXCR4 still remains, and signals a calcium flux on mature DCs. We argue that the downregulation of β-chemokine receptors during maturation helps to stop DC movement after T cells have been identified in lymphoid organs or at sites of delayed-type hypersensitivity.

Original languageEnglish
Pages (from-to)490-500
Number of pages11
JournalImmunobiology
Volume198
Issue number5
DOIs
Publication statusPublished - 1 Jan 1998
Externally publishedYes

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