title: Presence of activated lymphocytes in the peripheral blood of patients with halo nevi.
abstract: BACKGROUND
  The involution of the central pigmented lesion in halo nevus (HN) seems to be mediated by an immune response against self antigens expressed by melanocytes.
  
  
  OBJECTIVE
  We assessed the presence of activated lymphocytes in the peripheral blood lymphocytes from patients with HN.
  
  
  METHODS
  Peripheral blood was obtained from patients with HN associated with benign pigmented lesions (5) or melanoma (2) as well as from patients with melanoma without HN (5) and healthy subjects (10). Activated lymphocytes were detected by flow cytometry analysis using monoclonal antibodies (mAb) against CD69, CD71, CD98, HLA-DR, and activated beta(1) integrins (HUTS-21 mAb).
  
  
  RESULTS
  The peripheral blood lymphocytes from patients with HN, associated with either benign or malignant lesions, exhibited a significantly higher expression of all activation markers studied compared with patients with melanoma without HN or compared with healthy subjects. Therefore the peripheral blood of HN patients contained a significant fraction of lymphocytes with an activated (CD69(+), HLA-DR(+), CD98(bright)), cell proliferating (CD71( bright)), and high adhesive (HUTS-21(bright)) phenotype. These activated cells disappeared from peripheral blood after the surgical resection of the skin lesion.
  
  
  CONCLUSIONS
  Our findings further support the involvement of immune activation in HN phenomenon.
authors.affiliation: Department of Immunology, Facultad de Medicina, Universidad Autónoma de San Luis Potosi, Mexico.
authors.forename: L
authors.initials: L
authors.lastname: Baranda
authors.forename: B
authors.initials: B
authors.lastname: Torres-Alvarez
authors.forename: B
authors.initials: B
authors.lastname: Moncada
authors.forename: D
authors.initials: D
authors.lastname: Portales-Pérez
authors.forename: H
authors.initials: H
authors.lastname: de la Fuente
authors.forename: E
authors.initials: E
authors.lastname: Layseca
authors.forename: R
authors.initials: R
authors.lastname: González-Amaro
mesh_terms: D000293:Adolescent; D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D002648:Child; D005260:Female; D005434:Flow Cytometry; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D008213:Lymphocyte Activation; D008297:Male; D008545:Melanoma / Q000097:blood / Q000276:immunology; D008875:Middle Aged; D009508:Nevus, Pigmented / Q000097:blood* / Q000276:immunology; D012878:Skin Neoplasms / Q000097:blood* / Q000276:immunology
chemical_list: D015703:Antigens, CD; D006684:HLA-DR Antigens