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PRAM-1 is Required for Optimal Integrin-Dependent Neutrophil Function.
Molecular and cellular biology
  • Regina A Clemens
  • Sally A Newbrough
  • Elaine Y Chung
  • Shereen Gheith, Lehigh Valley Health Network
  • Andrew L Singer
  • Gary A Koretzky
  • Erik J Peterson
Publication/Presentation Date

PML-retinoic acid receptor alpha (RARalpha) regulated adaptor molecule 1 (PRAM-1) is an intracellular adaptor molecule that is upregulated during the induced granulocytic differentiation of promyelocytic leukemic cells and during normal human myelopoiesis. This report describes the generation of PRAM-1-deficient mice and an analysis of the function of this adaptor in neutrophil differentiation and mature neutrophil function. We demonstrate here that neutrophil differentiation is not impaired in PRAM-1-deficient mice and that PRAM-1-deficient neutrophils function normally following engagement of Fcgamma receptors. In contrast, mature PRAM-1-null neutrophils exhibit significant defects in adhesion-dependent reactive oxygen intermediate production and degranulation. Surprisingly, other integrin-dependent responses, such as cell spreading and activation of several signaling pathways, are normal. Together, these findings demonstrate the uncoupling of key integrin-dependent responses in the absence of PRAM-1 and show this adaptor to be critical for select integrin functions in neutrophils.

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Citation Information

Clemens, R. A., Newbrough, S. A., Chung, E. Y., Gheith, S., Singer, A. L., Koretzky, G. A., & Peterson, E. J. (2004). PRAM-1 is required for optimal integrin-dependent neutrophil function. Molecular And Cellular Biology, 24(24), 10923-10932.