PAL31 expression in rat trophoblast giant cells

Mayumi Oda, Weiyong Sun, Naka Hattori, Satoshi Tanaka, Kunio Shiota

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


PAL31 is a proliferation-related acidic nuclear protein that belongs to the leucine-rich protein family and is expressed cell-cycle-dependently. Trophoblasts differentiate into the trophoblast giant cells (TGCs) through the unusual type of cell cycle, namely endoreduplication. In the present study, we investigated the spatiotemporal pattern of PAL31 expression in rat placenta and Rcho-1 cell line. The PAL31 mRNA concentration varied in different areas of the placenta, and was barely detectable in the TGC layer. In Rcho-1 cells, although the level of PAL31 mRNA decreased dramatically during differentiation, PAL31 was detected even after differentiation. The site of intranuclear localization of PAL31 mostly overlapped with that of PCNA in the undifferentiated Rcho-1 cells, while they were not overlapped in differentiated cells. Thus, the subcellular localization of PAL31 in Rcho-1 cells significantly changed, and loss of cell cycle dependency after differentiation was noted. PAL31 is suggested to play a role in the endoreduplication distinct from the usual DNA duplication.

Original languageEnglish
Pages (from-to)721-726
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - 2001 Sept 28
Externally publishedYes


  • Cell cycle
  • Cell proliferation
  • DNA replication
  • Endoreduplication
  • PAL31
  • PCNA
  • Placenta
  • Pregnancy
  • Rcho-1
  • Trophoblast

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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