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Potentiation of signal transduction mitogenesis and cellular proliferation upon binding of receptor-recognized forms of alpha2-macroglobulin to 1-LN prostate cancer cells.

Publication ,  Journal Article
Misra, UK; Pizzo, SV
Published in: Cell Signal
April 2004

The alpha2-macroglobulin signalling receptor is upregulated in highly metastatic 1-LN prostate cancer cells. Stimulation of 1-LN cells with activated alpha2-macroglobulin (alpha2M*) caused a two- to threefold increase in [3H]thymidine uptake and cell number. These events require the Ras-dependent MAPK and PI 3-kinase/Akt signalling cascades. Incubation of 1-LN cells with alpha2M* induced Grb2, shc, sos and Raf-1 expression, as well as phosphorylation of MEK 1/2, ERK 1/2, p38 MAPK and JNK. This treatment also increased PI 3-kinase activation, PDK1 expression, Akt phosphorylation and p70s6k phosphorylation. Levels of the early gene products c-fos protein and thymidylate synthase were comparably increased. Exposure of 1-LN cells to alpha2M* significantly raised the levels of phosphorylated CREB by about 15-20 min and phosphorylated p53 by about 60-90 min of incubation. We conclude that the growth regulatory effects of ligating the alpha2M* signalling receptor on 1-LN cells are exerted via the onset and crosstalk between the Ras-dependent MAPK and PI 3-kinase/Akt signalling cascades.

Duke Scholars

Published In

Cell Signal

DOI

ISSN

0898-6568

Publication Date

April 2004

Volume

16

Issue

4

Start / End Page

487 / 496

Location

England

Related Subject Headings

  • p38 Mitogen-Activated Protein Kinases
  • alpha-Macroglobulins
  • Tumor Suppressor Protein p53
  • Tumor Cells, Cultured
  • Thymidylate Synthase
  • Ribosomal Protein S6 Kinases, 70-kDa
  • Proto-Oncogene Proteins c-fos
  • Protein Serine-Threonine Kinases
  • Prostatic Neoplasms
  • Phosphorylation
 
Journal cover image

Published In

Cell Signal

DOI

ISSN

0898-6568

Publication Date

April 2004

Volume

16

Issue

4

Start / End Page

487 / 496

Location

England

Related Subject Headings

  • p38 Mitogen-Activated Protein Kinases
  • alpha-Macroglobulins
  • Tumor Suppressor Protein p53
  • Tumor Cells, Cultured
  • Thymidylate Synthase
  • Ribosomal Protein S6 Kinases, 70-kDa
  • Proto-Oncogene Proteins c-fos
  • Protein Serine-Threonine Kinases
  • Prostatic Neoplasms
  • Phosphorylation