title: Clonal T cells in the blood of patients with systemic sclerosis.
abstract: BACKGROUND
  It has been suggested that clonal T cells may play a critical role in the pathogenesis of systemic sclerosis.
  
  
  METHODS
  A monoclonal population of T cells was found in blood samples from 13 (34%) of 38 consecutive patients with a definite diagnosis of systemic sclerosis who were prospectively examined by T-cell receptor gamma gene rearrangement using polymerase chain reaction analysis and denaturating gradient gel electrophoresis. In the healthy control group, the same type of examination revealed a monoclonal population of T cells in the blood samples from only 3 healthy subjects (4%)(odds ratio, 12.28; 95% confidence interval, 2.76-54.64; P = .001). Patients who had a circulating clonal population of T cells were older than those who did not (67 years vs 48 years; P = .04). There was a marked relationship between systemic sclerosis subtypes and the presence of a circulating clonal population of T cells. Twelve (43%) of 28 patients with limited cutaneous sclerosis exhibited a circulating clonal population of T cells, whereas only 1 (10%) of the 10 patients with diffuse cutanous sclerosis had evidence of T-cell clonality (P<.01).
  
  
  CONCLUSIONS
  Clonally expanded T cells were more commonly detected in patients with limited cutaneous sclerosis than in those with diffuse cutaneous sclerosis, which is also in accordance with a possible role of clonal T cells in patients with limited cutaneous sclerosis.
authors.affiliation: Department of Internal Medicine and INSERM Unit 644, Centre Hospitalier Universitaire de Rouen-Boisguillaume, Rouen, France. isabelle.marie@chu-rouen.fr
authors.forename: Isabelle
authors.initials: I
authors.lastname: Marie
authors.forename: Nadège
authors.initials: N
authors.lastname: Cordel
authors.forename: Bernard
authors.initials: B
authors.lastname: Lenormand
authors.forename: Marie-France
authors.initials: MF
authors.lastname: Hellot
authors.forename: Hervé
authors.initials: H
authors.lastname: Levesque
authors.forename: Hubert
authors.initials: H
authors.lastname: Courtois
authors.forename: Pascal
authors.initials: P
authors.lastname: Joly
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002999:Clone Cells / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D045743:Scleroderma, Diffuse / Q000097:blood; D045745:Scleroderma, Limited / Q000097:blood; D012595:Scleroderma, Systemic / Q000097:blood*; D013601:T-Lymphocytes / Q000473:pathology*