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Phospholipid biosynthesis program underlying membrane expansion during B-lymphocyte differentiation.

Paolo Fagone1, Rungtawan Sriburi, Cheryl Ward-Chapman

  • 1Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105-2794, USA.

The Journal of Biological Chemistry
|January 11, 2007
PubMed
Summary
This summary is machine-generated.

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Lipopolysaccharide (LPS) stimulates B-cells to produce more phospholipids, essential for antibody secretion. This study reveals a genetic and biochemical pathway driving membrane expansion in antibody-producing cells.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • B-lymphocytes differentiate into antibody-secreting plasma cells.
  • Plasma cell antibody production requires expanded endoplasmic reticulum and Golgi.
  • Lipopolysaccharide (LPS) from bacterial cell walls activates B-cells.

Purpose of the Study:

  • To investigate the genetic and biochemical mechanisms of phospholipid biogenesis in LPS-stimulated B-cells.
  • To understand how membrane expansion supports antibody secretion.

Main Methods:

  • Analysis of gene expression in LPS-activated murine B-cells (CH12 B-cells).
  • Measurement of phospholipid and fatty acid levels.
  • Assessment of CTP:phosphocholine cytidylyltransferase alpha (CCTalpha) protein stability.

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Main Results:

  • LPS stimulation upregulated genes for fatty acid synthesis and phospholipid biosynthesis, including Lipin1 and choline phosphotransferase.
  • CTP:phosphocholine cytidylyltransferase alpha (CCTalpha) protein levels increased due to enhanced stability, not transcription.
  • Elevated cellular diacylglycerol and fatty acids correlated with CCTalpha activation.

Conclusions:

  • LPS triggers a program for membrane phospholipid biogenesis in B-cells.
  • This process supports the expansion of ER and Golgi compartments for high-rate immunoglobulin production.