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Synergistic effects of retinoic acid and 8-Cl-cAMP on apoptosis require caspase-3 activation in human ovarian cancer cells

Oncogene volume 18, pages 1755–1763 (1999)Cite this article

Abstract

We investigated the intracellular mechanisms of retinoic acid (9-cis-RA, 13-cis-RA or all-trans-RA) and a cyclic AMP analog 8-Cl-cAMP on growth-inhibition and apoptosis in human ovarian cancer NIH: OVCAR-3 and OVCAR-8 cells. The cyclic AMP analog, 8-Cl-cAMP, acted synergistically with RA in inducing and activating retinoic acid receptor β (RARβ) which correlated with the growth inhibition, cell cycle arrest, and apoptosis in both cell types. In addition, combined treatment of cells with RA plus 8-Cl-cAMP resulted in the release of cytochrome c, loss in mitochondrial membrane potential and activation of caspase-3 followed by cleavage of anti-poly(ADP-ribose)polymerase and DNA-dependent protein kinase (catalytic subunit). Interestingly, inhibition of caspase-3 activation blocked RA plus 8-Cl-cAMP induced apoptosis. Furthermore, mutations in a CRE-related motif within the RARβ promoter resulted in loss of both transcriptional activation of RARβ and synergy between RA and 8-Cl-cAMP. Thus, RARβ can mediate RA and/or cyclic AMP action in ovarian cancer cells by promoting apoptosis. Loss of RARβ expression, therefore, may contribute to the tumorigenicity of human ovarian cancer cells. These findings suggest that RA and 8-Cl-cAMP act in a synergistic fashion in inducing apoptosis via caspase-3 activation, and may have potential for combination biotherapy for the treatment of malignant disease such as ovarian cancer.

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Abbreviations

RARβ:

retinoic acid receptor β

RA:

retinoic acid

PKA:

cAMP-dependent protein kinase

C:

catalytic subunit

PARP:

Poly(ADP-ribose)polymerase PARP

DNA-PK:

DNA-dependent protein kinase

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Acknowledgements

We are grateful to Drs P Chambon (Strasbourg, France) and X-K Zhang (California, USA) for providing retinoic acid receptor expression vectors. We also thank Dr JA Fontana (Baltimore, USA) for providing pRAREβ-tk-CAT expression vector.

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Authors and Affiliations

  1. Laboratory of Immunology, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Box 28, Baltimore, 21224-6825, Maryland, USA

    Rakesh K Srivastava & Dan L Longo

  2. Medicine Branch, National Cancer Institute, Bethesda, 20892, Maryland, USA

    Aparna R Srivastava

  3. Laboratory of Tumor Immunology and Biology, National Cancer Institute, N.I.H., Bethesda, 20892, Maryland, USA

    Yoon S Cho-Chung

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  1. Rakesh K Srivastava
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Srivastava, R., Srivastava, A., Cho-Chung, Y. et al. Synergistic effects of retinoic acid and 8-Cl-cAMP on apoptosis require caspase-3 activation in human ovarian cancer cells. Oncogene 18, 1755–1763 (1999). https://doi.org/10.1038/sj.onc.1202464

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