IGF-I and MAP Kinase Involvement in the Stimulatory Effects of LNCaP Prostate Cancer Cell Conditioned Media on Cell Proliferation and Protein Synthesis in MC3T3-E1 Osteoblastic Cells

Rumi S. Bhattacharyya, Paula H. Stern*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Bone metastases from prostate cancer cause abnormal new bone formation, however, the factors involved and the pathways leading to the response are incompletely defined. We investigated the mechanisms of osteoblast stimulatory effects of LNCaP prostate carcinoma cell conditioned media (CM). MC3T3-E1 osteoblastic cells were cultured with CM from confluent LNCaP cells. LNCaP CM stimulated MAP kinase, cell proliferation (3H-thymidine incorporation), and protein synthesis (14C-proline incorporation) in the MC3T3-E1 cells. The increases in cell proliferation and protein synthesis were prevented by inhibition of the MAP kinase pathway. IGF-I mimicked the effects of the CM on the MC3T3-E1 cells and inhibition of IGF-I action decreased the LNCaP CM stimulation of 3H-thymidine and 14C-proline incorporation and MAP kinase activity. The findings indicate that IGF-I is an important factor for the stimulatory effects of LNCaP cell CM on cell proliferation and protein synthesis in osteoblastic cells, and that MAP kinase is a component of the signaling pathway for these effects.

Original languageEnglish (US)
Pages (from-to)925-937
Number of pages13
JournalJournal of Cellular Biochemistry
Volume90
Issue number5
DOIs
StatePublished - Dec 1 2003

Keywords

  • IGF-I
  • LNCaP cells
  • MAP kinase
  • Osteoblastic metastases
  • Prostate cancer

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry
  • Cell Biology

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