Document Detail

Alterations on peripheral blood B-cell subpopulations in very early arthritis patients.
MedLine Citation:
PMID:  20211867     Owner:  NLM     Status:  In-Process    
OBJECTIVE: To characterize circulating B-cell subpopulations of arthritis patients with <6 weeks of disease duration.
METHODS: Peripheral blood samples were collected from very early untreated polyarthritis patients, with <6 weeks of disease duration, for flow cytometric evaluation of B-cell subpopulations. Samples from patients who were later diagnosed as RA [very early RA (VERA)] were also collected 4-6 weeks after starting a low dose of prednisone (5-10 mg) and 4 months after reaching the minimum effective dose of MTX. A matched healthy group was used as a control.
RESULTS: VERA patients have a lower percentage of total peripheral blood memory B cells (CD19(+)CD27(+)) and a significant decrease in the frequency of circulating pre-switch memory B cells (CD19(+)IgD(+)CD27(+)) as compared with controls. Therapy with corticosteroids or MTX was unable to restore the normal frequencies of these B-cell subpopulations. A significant decrease in peripheral pre-switch memory B cells is equally observed in other early arthritis patients. Furthermore, no significant differences are found in the frequencies of CD4(+) and CD8(+) T cells in all patient groups.
CONCLUSIONS: In very early polyarthritis patients, there is a reduction in circulating pre-switch memory B cells. The reasons that may account for this effect are still unknown. Short-term corticosteroids and MTX do not seem to have a direct effect on circulating B-cell subpopulations in VERA patients.
Rita A Moura; Pamela Weinmann; Patrícia A Pereira; Joana Caetano-Lopes; Helena Canhão; Elsa Sousa; Ana F Mourão; Ana M Rodrigues; Mário V Queiroz; Maria M Souto-Carneiro; Luís Graça; João E Fonseca
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-07
Journal Detail:
Title:  Rheumatology (Oxford, England)     Volume:  49     ISSN:  1462-0332     ISO Abbreviation:  Rheumatology (Oxford)     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883501     Medline TA:  Rheumatology (Oxford)     Country:  England    
Other Details:
Languages:  eng     Pagination:  1082-92     Citation Subset:  AIM; IM    
Rheumatology Research Unit, Instituto de Medicina Molecular, Edifício Egas Moniz, Faculdade de Medicina da Universidade de Lisboa, Av. Professor Egas Moniz, 1649-028 Lisboa, Portugal.
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