Lipocalin-type prostaglandin D synthase as a regulator of the retinoic acid signalling in melanocytes

Kazuhisa Takeda, Na Ho Takahashi, Miki Yoshizawa, Shigeki Shibahara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Lipocalin-type prostaglandin D synthase (L-PGDS) catalyses the formation of prostaglandin D 2 (PGD 2) and also functions as a transporter for lipophilic ligands, including all-trans retinoic acid (RA). Here, we show that human epidermal melanocytes produce and secrete L-PGDS and PGD 2 in culture medium, whereas L-PGDS is not expressed in human melanoma cell lines, HMV-II, SK-MEL-28, 624 mel and G361. Treatment with RA (1 or 10 μM) for 4 days decreased the proliferation of melanocytes (30 decrease), but not melanoma cells. We therefore isolated L-PGDS-expressing cell lines from 624 mel cells. Treatment with RA decreased the proliferation of L-PGDS-expressing cells by 20, but not mock-transfected cell lines lacking L-PGDS expression. RA induced expression of a cyclin-dependent kinase inhibitor p21 Cip1 in L-PGDS-expressing cells, but not mock-transfected cells. Moreover, RA increased the transient expression of a reporter gene carrying the RA-responsive elements in L-PGDS-expressing cell lines (at least 5-fold activation), compared to the 2-fold activation in mock-transfected cell lines, suggesting that L-PGDS may increase the sensitivity to RA. Lastly, the knockdown of L-PGDS expression by RNA interference was associated with the restoration of the RA-mediated decrease in proliferation of human and mouse melanocytes. In conclusion, L-PGDS may fine-tune the RA signalling in melanocytes.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalJournal of biochemistry
Issue number2
Publication statusPublished - 2010 Aug


  • all-trans retinoic acid
  • lipocalin-type prostaglandin D synthase
  • melanocytes
  • melanoma
  • proliferation

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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