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Related Experiment Video

Updated: May 7, 2026

Imaging the Human Immunological Synapse

Imaging the Human Immunological Synapse

Published on: December 26, 2019

Syntaxin-4 is essential for IgE secretion by plasma cells.

Arman Rahman¹, Joseph Decourcey, Nadia Ben Larbi

¹Immunomodulation Group, School of Biotechnology, Dublin City University, Ireland.

Biochemical and Biophysical Research Communications

|September 24, 2013

Summary

Syntaxin-4 is essential for immunoglobulin (Ig) secretion from plasma cells. Knocking down syntaxin-4 blocks IgE release and causes Ig accumulation, revealing its critical role in immune response and potential therapeutic targeting.

Keywords:

FBS Ig IgE secretion Multiple myeloma PBS Plasma cells SNARE Syntaxin-4 TNF VAMP VAMP3 fetal bovine serum immunoglobulin phosphate buffered saline siRNA small interfering RNA soluble N-ethylmaleimide-sensitive factor attachment protein receptor tumour necrosis factor vesicle-associate membrane protein

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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

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Published on: June 12, 2019

Area of Science:

Immunology
Cell Biology
Molecular Biology

Background:

The humoral immune system relies on plasma cells to secrete immunoglobulins (Ig) for pathogen defense.
Mechanisms of Ig secretion by plasma cells are not fully understood.
Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins regulate cellular protein trafficking.

Purpose of the Study:

To investigate the role of Syntaxin-4 in immunoglobulin E (IgE) secretion from human plasma cells.
To elucidate the mechanisms of constitutive Ig trafficking in plasma cells.

Main Methods:

Utilized Syntaxin-4 knock-down in the U266 human plasma cell line.
Assessed IgE secretion levels and intracellular IgE accumulation.
Performed co-localization studies of IgE and Syntaxin-4.

Main Results:

Syntaxin-4 knock-down led to a significant loss of IgE secretion.
IgE accumulated within the cells upon Syntaxin-4 knock-down.
IgE was observed to co-localize with Syntaxin-4 at the plasma membrane.

Conclusions:

Syntaxin-4 is critical for IgE secretion from plasma cells.
Syntaxin-4 directly participates in the plasma membrane fusion events required for Ig secretion.
Understanding Syntaxin-4's role may offer therapeutic targets for Ig-related diseases like multiple myeloma and autoimmune disorders.