title: Dendritic cells produce macrophage inflammatory protein-1 gamma, a new member of the CC chemokine family.
abstract: Langerhans cells (LC) are skin-specific members of the dendritic cell (DC) family. DC are unique among APC for their capacity to activate immunologically naive T cells, but little is known about their chemotactic recruitment of T cells. We now report that LC produce macrophage inflammatory protein-1 gamma (MIP-1 gamma), a newly identified CC chemokine. MIP-1 gamma mRNA was detected in epidermal cells freshly procured from BALB/c mice, and depletion of I-A+ epidermal cells (i.e., LC) abrogated that expression. MIP-1 gamma mRNA was detected in the XS52 LC-like DC line as well as by 4F7+ splenic DC and granulocyte-macrophage CSF-propagated bone marrow DC. XS52 DC culture supernatants contained 9 and 10.5 kDa immunoreactivities with anti-MIP-1 gamma Abs. We observed in Boyden chamber assays that 1) XS52 DC supernatant (added to the lower chambers) induced significant migration by splenic T cells; 2) this migration was blocked by the addition of anti-MIP-1 gamma in the lower chambers or by rMIP-1 gamma in the upper chambers; and 3) comparable migration occurred in both CD4+ and CD8+ T cells and in both activated and nonactivated T cells. We conclude that mouse DC (including LC) have the capacity to elaborate the novel CC chemokine MIP-1 gamma, suggesting the active participation of DC in recruiting T cells before activation.
authors.affiliation: Department of Dermatology, University of Texas Southwestern Medical Center, Dallas 75235, USA.
authors.forename: M
authors.initials: M
authors.lastname: Mohamadzadeh
authors.forename: A N
authors.initials: AN
authors.lastname: Poltorak
authors.forename: P R
authors.initials: PR
authors.lastname: Bergstressor
authors.forename: B
authors.initials: B
authors.lastname: Beutler
authors.forename: A
authors.initials: A
authors.lastname: Takashima
mesh_terms: D000818:Animals; D002460:Cell Line; D054407:Chemokine CCL4; D018925:Chemokines / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D003713:Dendritic Cells / Q000378:metabolism*; D005260:Female; D019402:Macrophage Inflammatory Proteins; D051379:Mice; D008807:Mice, Inbred BALB C; D015846:Monokines / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D012333:RNA, Messenger / Q000096:biosynthesis; D013601:T-Lymphocytes / Q000502:physiology
chemical_list: D054407:Chemokine CCL4; D018925:Chemokines; D019402:Macrophage Inflammatory Proteins; D015846:Monokines; D012333:RNA, Messenger