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(--)-epigallocatechin gallate enhances prostaglandin F2alpha-induced VEGF synthesis via upregulating SAPK/JNK activation in osteoblasts.
J Cell Biochem 2007; 100(5):1146-53JC

Abstract

Catechin, one of the major flavonoids presented in plants such as tea, reportedly suppresses bone resorption. We previously reported that prostaglandin F(2alpha) (PGF(2alpha)) stimulates the synthesis of vascular endothelial growth factor (VEGF) via p44/p42 mitogen-activated protein (MAP) kinase in osteoblast-like MC3T3-E1 cells. To clarify the mechanism of catechin effect on osteoblasts, we investigated the effect of (--)-epigallocatechin gallate (EGCG), one of the major green tea flavonoids, on the VEGF synthesis by PGF(2alpha) in MC3T3-E1 cells. The PGF(2alpha)-induced VEGF synthesis was significantly enhanced by EGCG. The amplifying effect of EGCG was dose dependent between 10 and 100 microM. EGCG did not affect the PGF(2alpha)-induced phosphorylation of p44/p42 MAP kinase. SB203580, a specific inhibitor of p38 MAP kinase, and SP600125, a specific inhibitor of stress-activated protein kinase/c-Jun N-terminal kinase (SAPK/JNK), reduced the PGF(2alpha)-induced VEGF synthesis. EGCG markedly enhanced the phosphorylation of SAPK/JNK induced by PGF(2alpha) without affecting the PGF(2alpha)-induced phosphorylation of p38 MAP kinase. SP600125 markedly reduced the amplification by EGCG of the SAPK/JNK phosphorylation. In addition, the PGF(2alpha)-induced phosphorylation of c-Jun was amplified by EGCG. These results strongly suggest that EGCG upregulate PGF(2alpha)-stimulated VEGF synthesis resulting from amplifying activation of SAPK/JNK in osteoblasts.

Authors+Show Affiliations

Department of Clinical Laboratory, National Hospital for Geriatric Medicine, National Center for Geriatrics and Gerontology, Obu, Aichi 474-8511, Japan. tokuda@ncgg.go.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17031857

Citation

Tokuda, Haruhiko, et al. "(--)-epigallocatechin Gallate Enhances Prostaglandin F2alpha-induced VEGF Synthesis Via Upregulating SAPK/JNK Activation in Osteoblasts." Journal of Cellular Biochemistry, vol. 100, no. 5, 2007, pp. 1146-53.
Tokuda H, Takai S, Matsushima-Nishiwaki R, et al. (--)-epigallocatechin gallate enhances prostaglandin F2alpha-induced VEGF synthesis via upregulating SAPK/JNK activation in osteoblasts. J Cell Biochem. 2007;100(5):1146-53.
Tokuda, H., Takai, S., Matsushima-Nishiwaki, R., Akamatsu, S., Hanai, Y., Hosoi, T., ... Kozawa, O. (2007). (--)-epigallocatechin gallate enhances prostaglandin F2alpha-induced VEGF synthesis via upregulating SAPK/JNK activation in osteoblasts. Journal of Cellular Biochemistry, 100(5), pp. 1146-53.
Tokuda H, et al. (--)-epigallocatechin Gallate Enhances Prostaglandin F2alpha-induced VEGF Synthesis Via Upregulating SAPK/JNK Activation in Osteoblasts. J Cell Biochem. 2007 Apr 1;100(5):1146-53. PubMed PMID: 17031857.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - (--)-epigallocatechin gallate enhances prostaglandin F2alpha-induced VEGF synthesis via upregulating SAPK/JNK activation in osteoblasts. AU - Tokuda,Haruhiko, AU - Takai,Shinji, AU - Matsushima-Nishiwaki,Rie, AU - Akamatsu,Shigeru, AU - Hanai,Yoshiteru, AU - Hosoi,Takayuki, AU - Harada,Atsushi, AU - Ohta,Toshiki, AU - Kozawa,Osamu, PY - 2006/10/13/pubmed PY - 2007/5/23/medline PY - 2006/10/13/entrez SP - 1146 EP - 53 JF - Journal of cellular biochemistry JO - J. Cell. Biochem. VL - 100 IS - 5 N2 - Catechin, one of the major flavonoids presented in plants such as tea, reportedly suppresses bone resorption. We previously reported that prostaglandin F(2alpha) (PGF(2alpha)) stimulates the synthesis of vascular endothelial growth factor (VEGF) via p44/p42 mitogen-activated protein (MAP) kinase in osteoblast-like MC3T3-E1 cells. To clarify the mechanism of catechin effect on osteoblasts, we investigated the effect of (--)-epigallocatechin gallate (EGCG), one of the major green tea flavonoids, on the VEGF synthesis by PGF(2alpha) in MC3T3-E1 cells. The PGF(2alpha)-induced VEGF synthesis was significantly enhanced by EGCG. The amplifying effect of EGCG was dose dependent between 10 and 100 microM. EGCG did not affect the PGF(2alpha)-induced phosphorylation of p44/p42 MAP kinase. SB203580, a specific inhibitor of p38 MAP kinase, and SP600125, a specific inhibitor of stress-activated protein kinase/c-Jun N-terminal kinase (SAPK/JNK), reduced the PGF(2alpha)-induced VEGF synthesis. EGCG markedly enhanced the phosphorylation of SAPK/JNK induced by PGF(2alpha) without affecting the PGF(2alpha)-induced phosphorylation of p38 MAP kinase. SP600125 markedly reduced the amplification by EGCG of the SAPK/JNK phosphorylation. In addition, the PGF(2alpha)-induced phosphorylation of c-Jun was amplified by EGCG. These results strongly suggest that EGCG upregulate PGF(2alpha)-stimulated VEGF synthesis resulting from amplifying activation of SAPK/JNK in osteoblasts. SN - 0730-2312 UR - https://www.unboundmedicine.com/medline/citation/17031857/_____epigallocatechin_gallate_enhances_prostaglandin_F2alpha_induced_VEGF_synthesis_via_upregulating_SAPK/JNK_activation_in_osteoblasts_ L2 - https://doi.org/10.1002/jcb.21104 DB - PRIME DP - Unbound Medicine ER -