Related Experiment Videos
Frequency of B cells in normal mice which recognize self proteins
M C Carlan1, A Peres, N B Nardi
1Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil.
Summary
This study found that approximately 1% of IgM-secreting B cells in normal mice recognize self-proteins. Immunization increased this frequency, providing cellular evidence for natural autoantibody networks.
Area of Science:
- Immunology
- Autoimmunity
- B cell biology
Background:
- The immune system's ability to distinguish self from non-self is crucial.
- Natural autoantibodies, particularly IgM, and antibody interactions suggest self-recognition within the immune system.
- Circulating IgM antibodies are thought to arise from selective B cell activation by self-proteins.
Purpose of the Study:
- To quantify the frequency of self-reacting B cells in healthy, adult mice.
- To investigate whether B cells recognize self-proteins from various organs.
- To examine the effect of immunization on self-reactive B cell frequency.
Main Methods:
- Utilized an ELISA spot assay to detect B cells recognizing self-proteins.
- Analyzed spleen cells from normal BALB/c and C57BL/6 mice.
- Compared frequencies between small and large LPS-stimulated spleen cells.
- Assessed changes in self-reactive B cell frequency post-immunization.
Main Results:
- Detected B cells reacting with self-proteins from organ extracts in normal mice.
- Approximately 1% of small, IgM-secreting spleen cells showed self-reactivity.
- Large spleen cells exhibited a 5- to 10-fold lower frequency of self-reactivity.
- Immunization led to an increased frequency of IgM-secreting, self-recognizing cells.
Conclusions:
- Provides cellular validation for previous serological findings on natural autoantibodies.
- Demonstrates the presence of self-recognizing B cells in normal mice.
- The precise physiological roles and involvement in autoimmune diseases require further investigation.