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Related Experiment Videos

Circulating T and B lymphocytes in progressive systemic sclerosis.

D G de Jesus, R L Clancy

    The Journal of Rheumatology
    |September 1, 1975
    PubMed
    Summary

    Progressive systemic sclerosis (PSS) patients show significantly lower levels of circulating thymus-derived (T) lymphocytes compared to healthy controls. However, bone-marrow derived (B) lymphocytes and their response to phytohemagglutinin were not significantly different.

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    Area of Science:

    • Immunology
    • Rheumatology
    • Cell Biology

    Background:

    • Progressive systemic sclerosis (PSS) is an autoimmune disease characterized by fibrosis and vascular abnormalities.
    • The role of lymphocyte subsets in the pathogenesis of PSS requires further elucidation.

    Purpose of the Study:

    • To quantify thymus-derived (T) and bone-marrow derived (B) lymphocytes in patients with PSS.
    • To assess the mitogenic response of lymphocytes to phytohemagglutinin (PHA) in PSS patients.

    Main Methods:

    • Quantification of T and B lymphocytes using specific receptor site identification.
    • Comparison of lymphocyte counts and proportions between 11 PSS patients and 11 age/sex-matched controls.
    • Assessment of lymphocyte mitogenic response to PHA via dose-response curves.

    Main Results:

    • Patients with PSS had a significantly lower percentage of circulating T lymphocytes (38%) compared to controls (56%) (P < 0.005).
    • No significant difference was observed in the percentage of circulating B lymphocytes between PSS patients (14%) and controls (11%).
    • The mitogenic response to PHA did not differ significantly between PSS patients and controls.

    Conclusions:

    • Circulating T lymphocyte levels are reduced in patients with active PSS.
    • B lymphocyte levels and their responsiveness to PHA are not significantly altered in PSS.
    • These findings suggest a potential role for T lymphocyte dysregulation in PSS pathogenesis.

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