Down-regulation of nucleophosmin/B23 during retinoic acid-induced differentiation of human promyelocytic leukemia HL-60 cells

Chen Ya Hsu, Yat Ming Yung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

60 Citations (Scopus)


Human promyelocytic leukemia HL-60 cells were induced to undergo granulocytic differentiation by treatment with retinoic acid (RA, 10 μM, 1-5 days). The steady-state level of nucleophosmin/B23 mRNA decreased during the RA-induced differentiation. There was also decrease in the level of total cellular nucleophosmin/B23 protein during the RA-induced differentiation. Stabilization and nuclear run-on assays indicate that the decrease in nucleophosmin/B23 mRNA in RA-treated HL-60 cells was transcriptionally regulated. Unlike c-myc mRNA, there was virtually no decline of nucleophosmin/B23 mRNA during the growth arrest by serum-starvation. The decrease in nucleophosmin/B23 mRNA expression in HL-60 cells subsequent to retinoic acid treatment can thus be attributed to cellular differentiation rather than the growth arrest induced by RA. Nucleophosmin/B23 antisense oligomer treatment significantly potentiated RA-induced cellular differentiation. Results of this study suggest that nucleophosmin/B23 is one of the key elements in the down-regulation of nucleolar function for cellular differentiation.
Original languageEnglish
Pages (from-to)915-923
Number of pages9
Issue number7
Publication statusPublished - 19 Feb 1998
Externally publishedYes


  • HL-60 differentiation
  • Nucleophosmin/B23
  • Retinoic acid

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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