Heat shock protein 70 (HSP70) does not prevent the inhibition of cell growth in DU-145 cells treated with TGF-beta1.

Journal Article

BACKGROUND: Mitogen-activated protein kinase (MAPK) is one of the transforming growth factor-beta (TGF-beta signaling pathways while heat shock protein 70 (HSP70) prevents apoptosis by affecting MAPK signaling downstream. However, the interrelationship between TGF-beta and HSP70 signaling is still unknown. MATERIALS AND METHODS: DU-145 prostate cancer cells were treated with 40 pM and 200 pM TGF-beta1. After 3, 6, 9, 12 and 24 hours, cell proliferation assay and cell cycle analysis were performed. The activities of HSP70 and MAPKs (c-Jun N-terminal kinase 1 (JNK1), extracellular signal-regulated kinase 1 (ERK1), ERK2 and p38) were analyzed by Western blot at each time-point. RESULTS: TGF-beta1 inhibited the cell growth in a dose-dependent manner at 3 hours. Late G1 accumulation in the cell cycle was observed in a dose-dependent manner after 24 hours. HSP70 and JNK1 increased only at 3 hours and decreased for up to 24 hours thereafter. ERK1, ERK2 and p38 decreased from 3 to 24 hours after TGF-beta1 treatment. CONCLUSION: These data suggest that HSP70 does not prevent the inhibition of cell growth in DU-145 cells treated with TGF-beta1.

Full Text

Duke Authors

Cited Authors

  • Ogawa, Y; Nakagami, Y; Ishizaki, R; Yoshida, H; Parkinson, KM; Robertson, CN; Paulson, DF

Published Date

  • September 2001

Published In

Volume / Issue

  • 21 / 5

Start / End Page

  • 3341 - 3347

PubMed ID

  • 11848492

International Standard Serial Number (ISSN)

  • 0250-7005

Language

  • eng

Conference Location

  • Greece