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B cell function in acquired "common-variable" hypogammaglobulinemia: proliferative responses to lymphokines
J Farrant1, A Bryant, F Almandoz
1Division of Immunological Medicine, Clinical Research Centre, Harrow, United Kingdom.
Clinical Immunology and Immunopathology
|May 1, 1989
Summary
B lymphocytes from patients with acquired hypogammaglobulinemia (CVH) show normal proliferation but impaired differentiation. This suggests distinct B cell defects in different patient subgroups.
Area of Science:
- Immunology
- Cell Biology
Background:
- Acquired (common variable) hypogammaglobulinemia (CVH) is characterized by low immunoglobulin levels.
- The precise B lymphocyte defect in CVH remains incompletely understood, with potential issues in growth or differentiation.
Purpose of the Study:
- To compare the proliferative responses of B lymphocytes from CVH patients with those from healthy individuals.
- To investigate potential differences in B cell function between CVH patient subgroups.
Main Methods:
- Enriched B lymphocyte populations from CVH patients and normal controls were isolated.
- Proliferative responses were assessed by [3H]thymidine uptake upon stimulation with interleukins (IL-2, IL-4, IL-6) and anti-IgM.
- Flow cytometry (CD19, surface IgM) was used to quantify B cell populations.
Main Results:
- CVH patients exhibited normal B lymphocyte proliferative responses to various stimuli when B cell numbers were within the normal range.
- No significant differences in proliferation were observed between CVH patients and controls.
- Immunoglobulin G (IgG) production was absent in all CVH patients, and immunoglobulin M (IgM) production was observed in only one patient.
Conclusions:
- The primary defect in CVH appears to be in B lymphocyte differentiation rather than proliferation.
- The presence or absence of B cells in CVH patients suggests distinct underlying defects in different subgroups of the disease.