Archives of Pharmacal Research

  • 제26권12호
  • /
  • Pages.1055-1060
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  • 2003
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  • 0253-6269(pISSN)
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  • 1976-3786(eISSN)
대한약학회 (The Pharmaceutical Society of Korea)
권호 표지

Lisophosphatidic Acid Inhibits Melanocyte Proliferation via Cell Cycle Arrest

  • Kim, Dong-Seok (Research Division for Human Life Sciences, Seoul National University) ;
  • Park, Seo-Hyoung (Department of Dermatology, National University College of Medicine) ;
  • Kim, Sung-Eun (Department of Dermatology, National University College of Medicine) ;
  • Kwon, Sun-Bang (Department of Dermatology, National University College of Medicine) ;
  • Park, Eun-Sang (Department of Dermatology, National University College of Medicine) ;
  • Youn, Sang-Woong (Department of Dermatology, National University College of Medicine) ;
  • Park, Kyoung-Chan (Department of Dermatology, National University College of Medicine)
  • 발행 : 2003.11.01
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초록

Lysophosphatidic acid (LPA) is a well-known mitogen in various cell types. However, we found that LPA inhibits melanocyte proliferation. Thus, we further investigated the possible signaling pathways involved in melanocyte growth inhibition. We first examined the regulation of the three major subfamilies of mitogen-activated protein (MAP) kinases and of the Akt pathway by LPA. The activations of extracellular signal-regulated protein kinase (ERK) and c-Jun N-terminal kinase (JNK) were observed in concert with the inhibition of melanocyte proliferation by LPA, whereas p38 MAP kinase and Akt were not influenced by LPA. However, the specific inhibition of the ERK or JNK pathways by PD98059 or D-JNKI1, respectively, did not restore the antiproliferative effect. We next examined changes in the expression of cell cycle related proteins. LPA decreased cyclin $D_1 and cyclin D_2$ levels but increased $p21^{WAF1/CIP1}$ (p21) and $p27^{KIP1}$ (p27) levels, which are known inhibitors of cyclin-dependent kinase. Flow cytometric analysis showed the inhibition of DNA synthesis by a reduction in the S phase and an increase in the $G_0/G_1$ phase of the cell cycle. Our results suggest that LPA induces cell cycle arrest by regulating the expressions of cell cycle related proteins.

키워드

참고문헌

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