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Type II PtdIns 4-kinase β associates with CD4-p56lck complex and is involved in CD4 receptor signaling

Ranjeet Kumar Sinha1, Naveen Bojjireddy, Deepak Kanojia

  • 1Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai, 400076, India, ranjeet@scripps.edu.

Molecular and Cellular Biochemistry
|June 29, 2014
PubMed

Insights

Type II phosphatidylinositol 4-kinase beta is crucial for CD4 receptor signaling in T cells. It regulates intracellular calcium release, impacting T cell activation pathways.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Type II phosphatidylinositol (PtdIns) 4-kinases synthesize PtdIns 4-phosphates, regulating cell functions including signaling and trafficking.
  • PtdIns 4-kinase beta is known to associate with the CD3 receptor in T cells, influencing calcium release and actin dynamics.

Purpose of the Study:

  • To investigate the role of type II PtdIns 4-kinase beta in CD4 receptor-mediated signaling pathways within T cells.

Main Methods:

  • Stimulation of CD4 receptors using monoclonal antibodies to assess associated PtdIns 4-kinase activity.
  • Biochemical characterization of the enzyme involved in CD4 signaling.
  • siRNA-mediated knockdown of type II PtdIns 4-kinase beta to evaluate its functional impact.

Main Results:

  • CD4 receptor crosslinking significantly increased CD4-associated PtdIns 4-kinase activity, dependent on p56(lck).
  • Biochemical analysis confirmed the enzyme belongs to the type II PtdIns 4-kinase family.
  • Knockdown of type II PtdIns 4-kinase beta abrogated CD4 receptor-induced intracellular calcium release.

Conclusions:

  • Type II PtdIns 4-kinase beta is a key component of CD4 receptor-mediated signaling.
  • This enzyme plays an integral role in regulating intracellular calcium release downstream of CD4 activation.

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