The ratio of SRPK1/SRPK1a regulates erythroid differentiation in K562 leukaemic cells

Ioannis Sanidas, Vassiliki Koutuala, Eleni Ritou, Jasmijn Daans, Christof Lenz, Mario Mairhofer, Makrina Daniilidou, Andrea Kolbus, Volker Kruft, Peter Ponsaerts, Eleni Nikolakaki

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

SRPK1, the prototype of the serine/arginine family of kinases, has been implicated in the regulation of multiple cellular processes such as pre-mRNA splicing, chromatin structure, nuclear import and germ cell development. SRPK1a is a much less studied isoform of SRPK1 that contains an extended N-terminal domain and so far has only been detected in human testis. In the present study we show that SRPK1 is the predominant isoform in K562 cells, with the ratio of the two isoforms being critical in determining cell fate. Stable overexpression of SRPK1a induces erythroid differentiation of K562 cells. The induction of globin synthesis was accompanied by a marked decrease in proliferation and a significantly reduced clonogenic potential. Small interfering RNA-mediated down-regulation of SRPK1 in K562 cells results similarly in a decrease in proliferative capacity and induction of globin synthesis. A decreased SRPK1/SRPK1a ratio is also observed upon hemin/DMSO-induced differentiation of K562 cells as well as in normal human erythroid progenitor cells. Mass spectrometric analysis of SRPK1a-associated proteins identified multiple classes of RNA-binding proteins including RNA helicases, heterogeneous nuclear ribonucleoproteins, ribosomal proteins, and mRNA-associated proteins. Several of the SRPK1a-copurifying proteins have been previously identified in ribosomal and pre-ribosomal complexes, thereby suggesting that SRPK1a may play an important role in linking ribosomal assembly and/or function to erythroid differentiation in human leukaemic cells.
Original languageEnglish
Pages (from-to)1319-1331
Number of pages13
JournalBIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
Volume1803
Issue number12
DOIs
Publication statusPublished - Dec 2010

Keywords

  • SRPK1a
  • SRPK1
  • K562 cell
  • Differentiation
  • Erythroid progenitor cell

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