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Induction of apoptosis by an inhibitor of cAMP-specific PDE in malignant murine carcinoma cells overexpressing PDE activity in comparison to their nonmalignant counterparts

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Abstract

In order to study potential changes in phosphodiesterase (PDE) activity associated with malignant transformation, normal primary keratinocytes and cells corresponding to different stages of epidermal tumor development in mouse skin were analyzed with respect to their 3′,5′-cyclic adenosine monophosphate (cAMP) hydrolyzing activity. Expression of cAMP-specific PDE-4, intracellular cAMP content, and the sensitivity to the growth inhibitory effect of the PDE-4-specific inhibitor 7-benzylamino-6-chloro-2 piperazino-4-pyrrolidino-pteridine (DC-TA-46) were studied in the two papilloma cell lines, MSCP6 and 308, and in the highly malignant carcinoma cell line CarB. No significant difference in soluble PDE activity and in intracellular cAMP was found in the two papilloma cell lines when compared to primary keratinocytes. In contrast, the spindle-cell carcinoma cell line CarB exhibited significantly higher PDE activity, concomitant with the lowest cAMP level. In all cell lines and also in the primary keratinocytes, rolipram-sensitive PDE-4 activity accounted for the major cAMP-hydrolyzing activity. In primary keratinocytes and in MSCP6 cells, the PDE-4 inhibitor DC-TA-46 induced at best marginal growth inhibition, whereas cell growth of 308 cells was markedly affected at concentrations >2 μM. The carcinoma cell line CarB showed the highest sensitivity to DC-TA-46 (IC50=0.8±0.3 μM). Treatment of CarB cells with DC-TA-46 strongly inhibits intracellular PDE activity, resulting in a marked and long-lasting rise of cAMP. After 24 h of treatment, arrest in the G0/G1 phase of the cell cycle is induced. Treatment with concentrations >2 μM of this highly effective PDE inhibitor results in induction of apoptotic cell death, as detected by fluorescence microscopy, flow cytometry, and ELISA-based determination of fragmented DNA in intact cells.

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Abbreviations

cAMP:

cyclic adenosine monosphosphate

cGMP:

cyclic guanosine monophosphate

DAPI:

4′,6-diamidino-2-phenylindol-dihydrochloride

DC-TA-46:

7-benzylamino-6-chloro-2-piperazino-4-pyrrolidino-pteridine

DMBA:

7,12-dimeth ylbenz(a)anthracene

EHNA:

erythro-9-(2-hydroxy-3-nonyl) adenine

Milrinone:

1,6-dihydro-2-methyl-6-oxo-(3,4′-bipyridine)-5-carbonitril

Motapizone:

4,5-dihydro-6-(4-[1H-imidazol-1-yl]-2-thienyl)-5-methyl-3-(2H)-pyridazinone

NCS:

newborn calf serum

PDE:

phosphodiesterase

RO 20-1724:

4-(3-butoxy-4-methoxybenzyl)-2-imidazolidone

rolipram:

4-(3-cyclopentyloxy-4-methoxyphenyl)-2-pyrrolidone

SR 101:

Sulforhodamine 101

SRB:

sulforhodamine B

TPA:

12-O-tetradecanoyl-phorbol-13-acetate

vinpocetine:

14-eburnamenine-carboxylic acid ethyl ester

zaprinast:

2-O-propoxyphenyl-8-azapurin-6-one

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Authors and Affiliations

  1. Department of Chemistry, Division of Food Chemistry and Environmental Toxicology, University of Kaiserslautern, PO Box 3049, D-67663, Kaiserslautern, Germany

    Doris Marko & Gerhard Eisenbrand

  2. Department of Biology, Human Biology and Human Genetics, University of Kaiserslautern, PO Box 3049, D-67663, Kaiserslautern, Germany

    Konstantinos Romanakis & Heinrich Zankl

  3. Research Program 2, Deutsches Krebsforschungszentrum Heidelberg, Im Neuenheimer Feld 280, D-69120, Heidelberg, Germany

    Gerhard Fürstenberger & Brigitte Steinbauer

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  1. Doris Marko
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Marko, D., Romanakis, K., Zankl, H. et al. Induction of apoptosis by an inhibitor of cAMP-specific PDE in malignant murine carcinoma cells overexpressing PDE activity in comparison to their nonmalignant counterparts. Cell Biochem Biophys 28, 75–101 (1998). https://doi.org/10.1007/BF02737806

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