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B Cell Activation and Differentiation

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

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Updated: Jun 2, 2026

In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

Published on: January 20, 2019

pERKing up the BLIMP in plasma cell differentiation.

David M Allman¹, Michael P Cancro

¹University of Pennsylvania School of Medicine, John Morgan Building, 3620 Hamilton Walk, Philadelphia, PA 19104, USA.

Science Signaling

|April 21, 2011

Summary

Extracellular signal-regulated kinase (ERK) activation is crucial for B cell differentiation into antibody-secreting plasma cells by inducing the key regulator Blimp-1. ERK-deficient B cells showed impaired plasma cell generation, challenging prior understanding of ERK

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Last Updated: Jun 2, 2026

In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

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Published on: January 20, 2019

Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

Published on: February 21, 2018

Area of Science:

Immunology
Cell Biology
Molecular Signaling

Background:

The differentiation of naïve B cells into antibody-secreting plasma cells is essential for adaptive immunity but the underlying intracellular pathways are not fully understood.
Extracellular signal-regulated kinase (ERK) signaling is traditionally associated with promoting cell division.
Plasma cells are terminally differentiated, non-dividing cells, creating a paradox for ERK's role in their development.

Purpose of the Study:

To elucidate the intracellular signaling pathways that regulate B cell differentiation into plasma cells.
To investigate the specific role of extracellular signal-regulated kinase (ERK) in plasma cell development.

Main Methods:

Analysis of intracellular signaling pathways in B cells.
Investigating the role of ERK activation in inducing transcriptional repressors.
Studying the impact of ERK deficiency on B cell differentiation and plasma cell formation.

Main Results:

Activation of extracellular signal-regulated kinase (ERK) is pivotal for inducing B lymphocyte-induced maturation protein 1 (Blimp-1).
Blimp-1 is a critical transcriptional repressor required for plasma cell differentiation.
B cells lacking ERK were significantly impaired in their ability to generate plasma cells.

Conclusions:

ERK signaling plays a previously unrecognized, essential role in driving plasma cell differentiation, independent of its role in cell division.
This finding reveals a novel signaling mechanism critical for antibody-mediated immunity.
The study highlights the context-dependent functions of ERK and potentially other kinases in cellular differentiation.