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Effects of histamine on immunophenotype and notch signaling in human HL-60 leukemia cells

Li Mei Yu1, Dai Xiong Chen, Qi Xin Zhou

  • 1The Key Laboratory of Cell Engineering in Guizhou Province, Affiliated Hospital of Zunyi Medical College, Zunyi Medical College, Zunyi, Guizhou Province, China. ylm6567@yahoo.com.cn

Experimental Biology and Medicine (Maywood, N.J.)
|October 25, 2006
PubMed

Insights

Histamine inhibits human leukemia cell growth and alters surface markers CD49d and CD31. These changes in immunophenotype occur independently of Notch signaling pathways.

Area of Science:

  • Hematology
  • Cell Biology
  • Immunology

Background:

  • Surface molecules are key biomarkers for cell proliferation, differentiation, and interaction.
  • Notch signaling is crucial for developmental processes and cell-fate decisions.
  • Histamine influences hematopoietic cell development and is used in leukemia immunotherapy.

Purpose of the Study:

  • To investigate the effects of histamine on the immunophenotype and Notch signaling in human HL-60 leukemia cells.
  • To determine if histamine's effects on leukemia cell growth and surface marker expression involve Notch signaling.

Main Methods:

  • HL-60 leukemia cells were treated with varying concentrations of histamine.
  • Cell proliferation was assessed using growth curves and colony-forming efficiency assays.
  • Immunophenotypic changes were analyzed via flow cytometry, focusing on surface molecules like CD49d and CD31.
  • Notch signaling pathway components (Notch1, Notch4, Jagged1, Delta4, HES1) were quantified using real-time RT-PCR.

Main Results:

  • Histamine inhibited HL-60 cell growth in a dose-dependent manner.
  • Histamine treatment significantly decreased CD49d expression by 74% and increased CD31 expression by 53%.
  • Histamine did not significantly alter the expression of other tested surface molecules or key components of the Notch signaling pathway.

Conclusions:

  • Histamine effectively inhibits HL-60 leukemia cell proliferation.
  • Histamine modulates specific cell surface markers (CD49d and CD31), altering the immunophenotype.
  • The observed immunophenotypic alterations induced by histamine in HL-60 cells are not mediated by the Notch signaling pathway.

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