Related Experiment Videos

Glucosamine inhibits IL-1beta-mediated IL-8 production in prostate cancer cells by MAPK attenuation

Cheng-Yen Tsai1, Tzong-Shyuan Lee, Yu Ru Kou

  • 1Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, Taiwan.

Journal of Cellular Biochemistry
|July 24, 2009
PubMed

Insights

Interleukin-1 beta (IL-1beta) drives prostate cancer cell growth and migration by increasing Interleukin-8 (IL-8) production. Glucosamine effectively blocks this process by inhibiting IL-1beta

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Chronic inflammation is implicated in cancer development.
  • Interleukin-8 (IL-8) is upregulated in prostate cancer and promotes tumor cell proliferation and migration.
  • The role of Interleukin-1 beta (IL-1beta) in regulating IL-8 expression in prostate cancer remains unclear.

Purpose of the Study:

  • To investigate whether IL-1beta regulates IL-8 expression in prostate cancer cells.
  • To determine the effect of glucosamine, an anti-inflammatory agent, on IL-1beta-induced IL-8 production.
  • To elucidate the signaling pathways involved in IL-1beta-mediated IL-8 production and the inhibitory effect of glucosamine.

Main Methods:

  • Utilized three prostate cancer cell lines (DU-145, PC-3, LNCaP).
  • Assessed IL-8 mRNA and protein expression using RT-PCR and ELISA.
  • Evaluated cell proliferation (MTT assay) and migration (wound-healing, transwell assays).
  • Investigated signaling pathways (MAPKs, NFkappaB) using pathway inhibitors and Western blotting for MAPK phosphorylation.

Main Results:

  • IL-1beta significantly increased IL-8 mRNA and protein levels in prostate cancer cells.
  • Glucosamine markedly inhibited IL-1beta-induced IL-8 secretion.
  • IL-8 promoted LNCaP cell proliferation and PC-3 cell migration.
  • IL-1beta activated MAPK pathways, which was suppressed by glucosamine, leading to reduced IL-8 production.
  • NFkappaB was not found to be involved in IL-1beta-mediated IL-8 production.

Conclusions:

  • IL-1beta induces prostate cancer cell proliferation and migration via MAPK-mediated IL-8 production.
  • Glucosamine attenuates prostate cancer cell proliferation and migration by inhibiting IL-1beta-induced MAPK activation and subsequent IL-8 reduction.
  • These findings highlight a potential therapeutic role for glucosamine in managing prostate cancer progression associated with inflammation.

Related Concept Videos

MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...