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B-cell-specific coactivator OBF-1/OCA-B/Bob1 required for immune response and germinal centre formation
D B Schubart1, A Rolink, M H Kosco-Vilbois
1Friedrich Miescher Institute, Basel, Switzerland.
Nature
|October 10, 1996
Summary
Oct binding factor (OBF)-1 is crucial for B cell immune responses. Mice lacking OBF-1 show impaired antibody production and germinal center formation, highlighting its role in adaptive immunity.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Oct binding factor (OBF)-1, also known as OCA-B or Bob1, is a B-lymphocyte-specific transcriptional coactivator.
- It is believed to mediate immunoglobulin gene transcription by binding to the octamer site in immunoglobulin promoters, facilitated by Oct-1 or Oct-2.
Purpose of the Study:
- To elucidate the in vivo function of OBF-1.
- To investigate the role of OBF-1 in immunoglobulin gene regulation, B cell development, and immune responses.
Main Methods:
- Gene targeting in embryonic stem cells to create OBF-1 deficient (OBF-1-/-) mice.
- Analysis of B cell populations, immunoglobulin gene rearrangement and transcription.
- Assessment of serum immunoglobulin levels and immune responses to thymus-independent and thymus-dependent antigens.
Main Results:
- OBF-1-/- mice exhibit largely unaffected immunoglobulin gene rearrangement and transcription.
- A significant reduction in mature and recirculating B cells was observed, despite normal B cell differentiation.
- Serum IgA and IgG levels were markedly reduced, and immune responses to antigens were severely impaired.
- Germinal center formation completely failed in OBF-1 deficient mice upon immunization with thymus-dependent antigens.
Conclusions:
- In vivo, OBF-1 is not essential for initial immunoglobulin gene transcription or basic B cell development.
- OBF-1 is indispensable for effective B cell responses to antigens.
- The study highlights OBF-1's critical role in germinal center formation and adaptive immunity.