title: Lymphokine-activated killer cell and natural killer cell activities in patients with systemic sclerosis.
abstract: OBJECTIVE
  To determine the ability of T lymphocytes and natural killer (NK) cells from patients with systemic sclerosis (SSc) to respond to cytokines and to generate immune effector cells.
  
  
  METHODS
  The numbers and percentages of peripheral blood T and NK cells were examined by 2-color flow cytometry, and NK and lymphokine-activated killer (LAK) cell function were measured in 4-hour 51Cr-release assays, in 34 patients with SSc. The patients were categorized into 3 subgroups: 10 had diffuse cutaneous disease of less than or equal to 3 years disease duration, 11 had diffuse cutaneous SSc of greater than 3 years duration, and 13 had limited cutaneous disease.
  
  
  RESULTS
  Baseline and activated NK and T cell numbers and NK activity were normal in SSc patients. However, mean LAK activity was significantly depressed in all SSc subgroups.
  
  
  CONCLUSIONS
  Decreased LAK cell function, despite normal numbers of circulating T and NK cells, indicates that SSc patients have poor ability to produce effector cells in response to interleukin-2.
authors.affiliation: Department of Medicine, University of Pittsburgh School of Medicine, Pennsylvania.
authors.forename: T V
authors.initials: TV
authors.lastname: Kantor
authors.forename: T L
authors.initials: TL
authors.lastname: Whiteside
authors.forename: D
authors.initials: D
authors.lastname: Friberg
authors.forename: R B
authors.initials: RB
authors.lastname: Buckingham
authors.forename: T A
authors.initials: TA
authors.lastname: Medsger
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis; D000943:Antigens, Differentiation / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D019002:CD56 Antigen; D016827:CD8 Antigens / Q000032:analysis; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D015979:Killer Cells, Lymphokine-Activated / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D007694:Killer Cells, Natural / Q000276:immunology*; D007958:Leukocyte Count; D008875:Middle Aged; D011961:Receptors, Fc / Q000032:analysis; D017452:Receptors, IgG; D012595:Scleroderma, Systemic / Q000097:blood / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D019002:CD56 Antigen; D016827:CD8 Antigens; D007376:Interleukin-2; D011961:Receptors, Fc; D017452:Receptors, IgG