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Related Experiment Video

Updated: Jun 2, 2026

Flow Cytometric Characterization of Murine B Cell Development

Flow Cytometric Characterization of Murine B Cell Development

Published on: January 22, 2021

Eukaryotic initiation factor 2alpha phosphorylation is required for B-cell maturation and function in mice.

Nina Mielke¹, Rolf Schwarzer, Cornelis F Calkhoven

¹Department of Hematology and Oncology, Charité, Campus Virchow-Klinikum, University Medicine Berlin, Berlin, Germany.

|May 14, 2011

Summary

Regulation of translation via eukaryotic initiation factor 2α (eIF2α) phosphorylation is not essential for hematopoietic stem cell reconstitution. However, it is crucial for the proper development and maintenance of B cells.

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Isolation and Activation of Murine Lymphocytes

Isolation and Activation of Murine Lymphocytes

Published on: October 30, 2016

Area of Science:

Molecular Biology
Cell Biology
Immunology

Background:

Translation initiation control is key to gene expression regulation.
Eukaryotic initiation factor 2α (eIF2α) is vital for binding initiator tRNA to the AUG codon, a rate-limiting step in translation.
eIF2α phosphorylation at serine 51, linked to stress response, inhibits translation, but its role in hematopoiesis is not fully understood.

Purpose of the Study:

To investigate the physiological role of eIF2α phosphorylation in hematopoiesis.
To determine the impact of a non-phosphorylatable eIF2α mutant on hematopoietic stem cell function and B-cell development.

Main Methods:

Hematopoietic stem cells with a non-phosphorylatable eIF2α mutant (eIF2αAA) were used.
Reconstitution efficiency was assessed in wild-type and B-cell-deficient microMT C57BL/6 recipients.
Two independent experimental models were employed.

Main Results:

Phosphorylation-deficient eIF2α mutant hematopoietic stem cells can repopulate lethally irradiated mice.
These cells exhibit defects in the development and maintenance of B cells in bone marrow and periphery.
Mature B-cell compartments are reduced, with impaired B-cell receptor-mediated proliferation and serum immunoglobulin secretion.

Conclusions:

Regulation of translation by eIF2α phosphorylation is dispensable for overall hematopoietic reconstitution.
This regulatory mechanism is essential for later stages of B-cell development.