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Cholera toxin-sensitive and insensitive signaling via surface Ig
G L Warner1, S Davies, D W Scott
1Immunology Unit, University of Rochester Cancer Center, NY 14642.
Journal of Immunology (Baltimore, Md. : 1950)
|July 15, 1989
Summary
Cholera toxin (CT) blocks B cell activation via surface immunoglobulin (Ig) but not IL-4 signaling. IL-4 can overcome CT
Area of Science:
- Immunology
- Cell Signaling
- B cell biology
Background:
- B cell activation is crucial for adaptive immunity.
- Surface immunoglobulin (Ig) and cytokines like IL-4 are key regulators of B cell responses.
- Cholera toxin (CT) is known to modulate cellular signaling pathways.
Purpose of the Study:
- To investigate the effect of cholera toxin (CT) on B cell activation.
- To determine if CT affects signaling through surface immunoglobulin (Ig) or IL-4.
- To elucidate the distinct signaling pathways involved in B cell activation.
Main Methods:
- Murine B cells were pretreated with cholera toxin (CT).
- B cell activation was measured by cell volume increase and cell cycle entry (S phase).
- Responses to anti-Ig and IL-4 were assessed in CT-pretreated and control cells.
Main Results:
- CT pretreatment inhibited B cell activation via surface Ig, measured by cell volume and S phase entry.
- CT did not inhibit IL-4-mediated signaling, indicated by cell volume increase.
- IL-4 restored anti-Ig responsiveness in CT-pretreated B cells, suggesting IL-4 overcomes CT effects.
- CT did not affect anti-Ig-induced B cell nonresponsiveness or growth inhibition in WEHI-231 cells.
Conclusions:
- Two distinct signaling pathways are mediated by surface Ig cross-linking.
- One pathway is sensitive to CT modulation, while the other is insensitive.
- IL-4 signaling represents a CT-insensitive pathway, highlighting differential regulation of B cell activation.