Induction and Assessment of Class Switch Recombination in Purified Murine B Cells

Ahmad Zaheen; Alberto Martin

doi:10.3791/2130

Induction and Assessment of Class Switch Recombination in Purified Murine B Cells

JoVE Journal
Immunology and Infection

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JoVE Journal Immunology and Infection

Induction and Assessment of Class Switch Recombination in Purified Murine B Cells

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09:49 min

August 13, 2010

DOI: 10.3791/2130-v

Ahmad Zaheen¹, Alberto Martin¹

¹Department of Immunology,University of Toronto

Overview

This article discusses the process of class switch recombination (CSR) in B cells following antigen exposure. It outlines a protocol for inducing and analyzing CSR in vitro to study B cell function.

Key Study Components

Area of Science

Immunology
B cell biology
Antibody production

Background

B cells are crucial for the humoral immune response.
Activated B cells undergo CSR to produce different antibody isotypes.
Understanding CSR is essential for insights into B cell function and regulation.
This study utilizes in vitro methods to analyze B cell behavior.

Purpose of Study

To demonstrate a technique for isolating and activating splenic B cells.
To investigate class switch recombination and proliferation in vitro.
To explore the function and regulation of activation-induced cytidine deaminase.

Methods Used

Isolation of splenic B cells from experimental mice using magnetic cell separation.
Staining cells with CFSE to monitor proliferation.
Stimulating cells with bacterial LPS to induce class switching.
Monitoring proliferation and class switching using flow cytometry.

Main Results

Successful isolation and activation of pure splenic B cells.
Induction of class switch recombination to IgG3 isotype.
Proliferation of B cells was effectively monitored.
Insights into B cell immunity were gained through this study.

Conclusions

The protocol provides a reliable method for studying B cell function.
Findings contribute to understanding the mechanisms of CSR.
This research can help answer key questions in B cell immunity.

Frequently Asked Questions

What is class switch recombination?

Class switch recombination is a process that allows B cells to change the antibody isotype they produce, enhancing their ability to respond to different pathogens.

Why is the study of B cells important?

B cells play a critical role in the immune response by producing antibodies, and understanding their function can lead to better vaccines and therapies.

How are B cells activated?

B cells are activated by binding to specific antigens and receiving signals from helper T cells, leading to proliferation and differentiation.

What role does LPS play in this study?

LPS is used to stimulate B cells in vitro, promoting their proliferation and class switch recombination.

What techniques are used to analyze B cell function?

Flow cytometry is used to monitor cell proliferation and class switching, providing quantitative data on B cell responses.

Following antigen exposure, subpopulations of activated B cells undergo a process known as class switch recombination (CSR) to produce antibody isotypes with distinct effector functions. The protocol outlined in this report explains how CSR can be induced and analyzed in vitro for the purposes of studying B cell function.

During the humoral immune response, B cells activated by antigen proliferate and secrete antibodies as the response progresses. The default I GM antibody ISOTYPE is substituted with the more diverse IgG iga or IgE isotypes to assess proliferation and class switching. In vitro splenic B cells are isolated from an experimental mouse using magnetic cell separation.

The cells are stained with the fluorescent dye CFSE to monitor proliferation, which is stimulated by treatment with bacterial L-P-S-L-P-S stimulation also induces class switching to the isotype IgG three, which along with proliferation, can be monitored by flow cytometry. Today I'll be showing you a technique for the isolation and activation of pure splenic B cells. This technique can be used to look at class switch recombination and proliferation in vitro, and it can also be used to answer key questions in the field of B cell immunity, including the function and regulation of activation induced citing in deaminase.

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