title: Functional aberrant expression of CCR2 receptor on chronically activated NK cells in patients with TAP-2 deficiency.
abstract: Chemokines play a pivotal role in homeostatic and inflammatory migration of naive and activated natural killer (NK) subsets. Recent studies have shown that aberrant chemokine receptor expression on certain immune cells underlies the pathogenesis of clinical conditions in which recruitment of such cells is altered. Progressive accumulation of activated NK cells, subsequently resulting in the formation of chronic granulomatous lesions in the respiratory tract and the skin, has been described in a number of patients with transporter associated with antigen processing 2 (TAP-2) deficiency in the later stages of disease. Therefore, the goal of the present study was to elucidate whether the dysregulation of chemoattracting receptor expression on NK cells could explain abnormal navigation of these cells in TAP-2 deficiency. High-throughput proteomic comparison, followed by verification with flow cytometry, revealed that chronically activated NK cells derived from 3 newly identified patients with TAP-2 deficiency consistently expressed aberrant levels of CC chemokine receptor 2 (CCR2) chemokine receptor in vitro and in vivo. This expression pattern translated into specific responsiveness of chronically activated NK cells derived from patients with TAP-2 deficiency to multiple ligands of CCR2. Moreover, the in vivo elevated levels of interleukin-2 (IL-2) and monocyte chemoattractant protein-1 (MCP-1) detected in serum and bronchoalveolar lavage samples derived from these patients highlight the potential involvement of the CCR2 pathway in aberrant NK-cell retention at chronic inflammatory sites.
authors.affiliation: Lautenberg Center for General and Tumor Immunology, Hebrew University-Hadassah Medical School, Jerusalem, Israel.
authors.forename: Jacob
authors.initials: J
authors.lastname: Hanna
authors.forename: Huda
authors.initials: H
authors.lastname: Mussaffi
authors.forename: Guy
authors.initials: G
authors.lastname: Steuer
authors.forename: Suhair
authors.initials: S
authors.lastname: Hanna
authors.forename: Maher
authors.initials: M
authors.lastname: Deeb
authors.forename: Hannah
authors.initials: H
authors.lastname: Blau
authors.forename: Tal I
authors.initials: TI
authors.lastname: Arnon
authors.forename: Noam
authors.initials: N
authors.lastname: Weizman
authors.forename: Ofer
authors.initials: O
authors.lastname: Mandelboim
mesh_terms: D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000276:immunology*; D002465:Cell Movement / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D018932:Chemokine CCL2 / Q000276:immunology; D002908:Chronic Disease; D005786:Gene Expression Regulation / Q000235:genetics* / Q000276:immunology; D030342:Genetic Diseases, Inborn / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000276:immunology / Q000473:pathology; D018664:Interleukin-12 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology* / Q000473:pathology; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology; D054390:Receptors, CCR2; D019707:Receptors, Chemokine / Q000235:genetics / Q000276:immunology*; D012140:Respiratory Tract Diseases / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D015398:Signal Transduction / Q000235:genetics / Q000276:immunology; D012871:Skin Diseases / Q000235:genetics / Q000276:immunology*
chemical_list: D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters; C111835:CCL2 protein, human; C515334:CCR2 protein, human; D018932:Chemokine CCL2; D054390:Receptors, CCR2; D019707:Receptors, Chemokine; C071692:TAP2 protein, human; D018664:Interleukin-12