The inhibition of DNA synthesis by prostaglandin E2 in human gingival fibroblasts is independent of the cyclic AMP-protein kinase A signal transduction pathway

H. Arai, Y. Nomura, M. Kinoshita, F. Nishimura, M. Takigawa, K. Takahashi, N. Washio, S. Takashiba, Y. Murayama

Research output: Contribution to journalArticle

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Abstract

In this study we attempted to clarify the mechanism of the inhibitory effects of PGE2 on DNA synthesis in Gin-1 (fibroblasts derived from healthy human gingiva) from the aspect of the cyclic AMP-dependent protein kinase signal transduction pathway. PGE2 upregulated intracellular cyclic AMP accumulation and inhibited DNA synthesis in Gin-1 in a dose-dependent manner. When the PGE2-induced intracellular cyclic AMP accumulation was further enhanced by treatment with the cyclic AMP-phosphodiesterase inhibitor, IBMX, the inhibitory effect of PGE2 on DNA synthesis was also enhanced. Furthermore, when we examined the effects of forskolin, an activator of cyclic AMP production, on intracellular cyclic AMP accumulation and DNA synthesis, similar results were obtained. However, inhibitors of cyclic AMP-dependent protein kinase (protein kinase A) such as HA1004 did not diminish the inhibitory effect of PGE2 on DNA synthesis in Gin-1. These results suggest that in Gin-1. PGE2-induced cyclic AMP accumulation may not lead to the activation of protein kinase A or protein kinase A activity may not relate directly to the growth inhibitory effect of PGE2, and that PGE2 does not inhibit DNA synthesis through the cyclic AMP-protein kinase A signal transduction pathway in Gin-1.

Original languageEnglish
Pages (from-to)33-39
Number of pages7
JournalJournal of Periodontal Research
Volume33
Issue number1
Publication statusPublished - Jan 1 1998
Externally publishedYes

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Adenylate Kinase
Cyclic AMP-Dependent Protein Kinases
Dinoprostone
Cyclic AMP
Signal Transduction
Fibroblasts
DNA
1-Methyl-3-isobutylxanthine
Phosphodiesterase Inhibitors
Gingiva
Colforsin
Growth

All Science Journal Classification (ASJC) codes

  • Periodontics

Cite this

The inhibition of DNA synthesis by prostaglandin E2 in human gingival fibroblasts is independent of the cyclic AMP-protein kinase A signal transduction pathway. / Arai, H.; Nomura, Y.; Kinoshita, M.; Nishimura, F.; Takigawa, M.; Takahashi, K.; Washio, N.; Takashiba, S.; Murayama, Y.

In: Journal of Periodontal Research, Vol. 33, No. 1, 01.01.1998, p. 33-39.

Research output: Contribution to journalArticle

Arai, H, Nomura, Y, Kinoshita, M, Nishimura, F, Takigawa, M, Takahashi, K, Washio, N, Takashiba, S & Murayama, Y 1998, 'The inhibition of DNA synthesis by prostaglandin E2 in human gingival fibroblasts is independent of the cyclic AMP-protein kinase A signal transduction pathway', Journal of Periodontal Research, vol. 33, no. 1, pp. 33-39.
Arai, H. ; Nomura, Y. ; Kinoshita, M. ; Nishimura, F. ; Takigawa, M. ; Takahashi, K. ; Washio, N. ; Takashiba, S. ; Murayama, Y. / The inhibition of DNA synthesis by prostaglandin E2 in human gingival fibroblasts is independent of the cyclic AMP-protein kinase A signal transduction pathway. In: Journal of Periodontal Research. 1998 ; Vol. 33, No. 1. pp. 33-39.
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AU - Nishimura, F.

AU - Takigawa, M.

AU - Takahashi, K.

AU - Washio, N.

AU - Takashiba, S.

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AB - In this study we attempted to clarify the mechanism of the inhibitory effects of PGE2 on DNA synthesis in Gin-1 (fibroblasts derived from healthy human gingiva) from the aspect of the cyclic AMP-dependent protein kinase signal transduction pathway. PGE2 upregulated intracellular cyclic AMP accumulation and inhibited DNA synthesis in Gin-1 in a dose-dependent manner. When the PGE2-induced intracellular cyclic AMP accumulation was further enhanced by treatment with the cyclic AMP-phosphodiesterase inhibitor, IBMX, the inhibitory effect of PGE2 on DNA synthesis was also enhanced. Furthermore, when we examined the effects of forskolin, an activator of cyclic AMP production, on intracellular cyclic AMP accumulation and DNA synthesis, similar results were obtained. However, inhibitors of cyclic AMP-dependent protein kinase (protein kinase A) such as HA1004 did not diminish the inhibitory effect of PGE2 on DNA synthesis in Gin-1. These results suggest that in Gin-1. PGE2-induced cyclic AMP accumulation may not lead to the activation of protein kinase A or protein kinase A activity may not relate directly to the growth inhibitory effect of PGE2, and that PGE2 does not inhibit DNA synthesis through the cyclic AMP-protein kinase A signal transduction pathway in Gin-1.

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