Molecular and Cellular Biochemistry

, Volume 204, Issue 1–2, pp 1–9 | Cite as

Synergistic effects of 8-Cl-cAMP and retinoic acids in the inhibition of growth and induction of apoptosis in ovarian cancer cells: Induction of retinoic acid receptor β

  • Rakesh K. Srivastava
  • Aparna R. Srivastava
  • Yoon S. Cho-Chung


Both cAMP and retinoids play a role in cell differentiation and the control of cell growth. A site-selective cAMP analog, 8-Cl-cAMP and retinoic acid synergistically inhibit growth and induce apoptosis in certain cancer cells. In advanced or recurrent malignant diseases, retinoic acid (RA) is not effective even at doses that are toxic to the host. The objective of our present study was to examine the mechanism(s) of synergistic effects of retinoic acid (9-cis, 13-cis or all-trans RA) and 8-Cl-cAMP on apoptosis in human ovarian cancer NIH: OVCAR-3 and OVCAR-8 cells. RA induced growth inhibition and apoptosis in OVCAR-3 and OVCAR-8 cells. 8-Cl-cAMP acted synergistically with RA in inducing and activating retinoic acid receptor β (RARβ) which correlates with growth inhibition and apoptosis in both cell types. In addition, induction of apoptosis by RA plus 8-Cl-cAMP requires caspase-3 activation followed by cleavage of anti-poly(ADP-ribose) polymerase. Furthermore, mutations in CRE-related motif within the RARβ promoter resulted in loss of both transcriptional activation of RARβ and synergy between RA and 8-Cl-cAMP. RARβ expression appears to be associated with induction of apoptosis. Introduction of the RARβ gene into OVCAR-3 cells resulted in gain of RA sensitivity. Loss of RARβ expression, therefore, may contribute to the tumorigenicity of human ovarian cancer cells. Thus, combined treatment with RA and 8-Cl-cAMP may provide an effective means for inducing RARβ expression leading to apoptosis in ovarian cancer cells.

retinoic acid RARβ protein kinase A apoptosis caspase 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Rakesh K. Srivastava
    • 1
  • Aparna R. Srivastava
    • 2
  • Yoon S. Cho-Chung
    • 1
  1. 1.Cellular Biochemistry Section, Laboratory of Tumor Immunology and BiologyNational Cancer InstituteBethesdaUSA
  2. 2.National Cancer InstituteMedicine BranchBethesdaUSA

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