PKA-Mediated Regulation of B/K Gene Transcription in PC12 Cells

  • Choi, Mi-Hyun (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Kim, Ho-Shik (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Choi, Sung-Ho (R&D Center, PetaGen, B199F Yonsei Engineering Research Complex) ;
  • Kim, Mi-Young (Dae-Myung Science) ;
  • Jang, Yoon-Seong (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Jang, Young-Min (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Lee, Jeong-Hwa (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Jeong, Seong-Whan (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Kim, In-Kyung (Department of Biochemistry, The Catholic University of Korea College of Medicine) ;
  • Kwon, Oh-Joo (Department of Biochemistry, The Catholic University of Korea College of Medicine)
  • Published : 2005.12.21

Abstract

B/K protein is a novel protein containing double C2-like domains. We examined the specific signaling pathway that regulates the transcription of B/K in PC12 cells. When the cells were treated with forskolin ($50{\mu}M$), B/K mRNA and protein levels were time-dependently decreased, reaching the lowest level at 3 or 4 hr, and thereafter returning to the control level. Chemicals such as dibutyryl-cAMP, cellpermeable cyclic AMP (cAMP) analogue and CGS21680, adenosine receptor $A_{2A}$ agonist, also repressed the B/K transcription. However, 1,9-dideoxyforskolin did not show inhibitory effect on B/K transcription, suggesting direct involvement of cAMP in the forskolin-induced inhibition of B/K transcription. Effect of forskolin, dibutyryl cAMP and CGS21680 was significantly reduced in PKA-deficient PC12 cell line (PC12-123.7). One cAMP-response element (CRE)-like sequence (B/K CLS) was found in the promoter region of B/K DNA, and electrophoretic mobility shift assay indicated its binding to CREM and CREB. Forskolin significantly suppressed the promoter activity in CHO-K1 cells transfected with the constructs containing B/K CLS, but not with the construct in which B/K CLS was mutated (AC:TG). Taken together, we suggest that the transcription of B/K gene in PC12 cells may be regulated by PKA-dependent mechanism.

Keywords

References

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