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IgD can largely substitute for loss of IgM function in B cells
C Lutz1, B Ledermann, M H Kosco-Vilbois
1Max-Planck-Institute for Immunobiology, Freiburg, Germany.
Nature
|July 9, 1998
Summary
Immunoglobulin D (IgD) can largely replace Immunoglobulin M (IgM) functions in mice, demonstrating its significant role in B-cell development and immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Immunoglobulin M (IgM) and Immunoglobulin D (IgD) are the first antibody isotypes expressed during B-cell development.
- Their heavy chains (mu and delta) originate from a common transcription unit.
- The precise function of IgD in B-cell development and immunity remains unclear.
Purpose of the Study:
- To investigate the functional role of IgD in the absence of IgM.
- To determine if IgD can compensate for IgM's functions during B-cell development and immune responses.
Main Methods:
- Generation of mice deficient in IgM (IgM-/-) by deleting the mu region in embryonic stem cells.
- Analysis of B-cell development, maturation, and immune responses following immunization or infection in IgM-/- mice.
- Assessment of survival and immunoglobulin production after viral infection.
Main Results:
- IgM-/- mice exhibited normal B-cell development and maturation, with IgD substituting for both membrane-bound and secretory IgM.
- Specific B-cell responses and isotype class switching occurred effectively in the absence of IgM.
- While IgM-/- mice survived viral infection, they showed delayed specific immunoglobulin responses compared to wild-type controls.
Conclusions:
- Immunoglobulin D (IgD) is largely capable of substituting for Immunoglobulin M (IgM) functions.
- This highlights a significant, previously underestimated role for IgD in adaptive immunity and B-cell regulation.