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PLCγ-dependent mTOR signalling controls IL-7-mediated early B cell development.

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|November 15, 2017
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Phospholipase C gamma (PLCγ) signaling is essential for early B cell development by activating mTOR, independent of Akt signaling. This pathway is crucial for responding to Interleukin-7 (IL-7) during B lymphopoiesis.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Early B cell lymphopoiesis regulation remains incompletely understood at the molecular level.
  • Phospholipase C gamma (PLCγ) signaling is vital for lymphocyte activation via antigen receptors, but its role in cytokine signaling is unknown.

Purpose of the Study:

  • To elucidate the role of PLCγ signaling in cytokine-mediated regulation of early B cell development.
  • To investigate the molecular mechanism by which Interleukin-7 (IL-7) signaling controls B lymphopoiesis.

Main Methods:

  • Utilized PLCγ1/PLCγ2 double-deficient mice to study B cell development.
  • Assessed the impact of PLCγ pathway inhibition on IL-7 signaling, mTOR activation, and Stat5 phosphorylation.
  • Analyzed gene expression profiles in B cell progenitors.

Main Results:

  • PLCγ1/PLCγ2 deficiency blocked B cell development at the pre-pro-B cell stage and abrogated IL-7 responsiveness.
  • PLCγ pathway inhibition blocked IL-7-induced mTOR activation, but not Stat5 activation, via the DAG/PKC branch, independent of Akt/TSC/Rheb.
  • Impaired mTOR activation due to PLCγ/PKC inhibition hindered IL-7-mediated B cell development and reduced expression of key lineage, signaling, and cell cycle genes.

Conclusions:

  • The IL-7 receptor controls early B lymphopoiesis by activating mTOR through the PLCγ/DAG/PKC signaling pathway.
  • This mechanism is distinct from the conventional Akt/Rheb signaling axis in IL-7-mediated B cell development.
  • PLCγ signaling is a critical regulator of B cell progenitor proliferation and differentiation.