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Interleukin-1beta-induced iNOS expression in human lung carcinoma A549 cells: involvement of STAT and MAPK pathways

Kameswaran Ravichandran1, Alpna Tyagi, Gagan Deep

  • 1Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Denver, Aurora, CO 80045, USA.

Indian Journal of Experimental Biology
|December 1, 2011
PubMed

Insights

Interleukin-1 beta (IL-1beta) promotes lung cancer by increasing inducible nitric oxide synthase (iNOS) expression via multiple signaling pathways. Broad-spectrum agents may be more effective than specific inhibitors for lung cancer treatment.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Immunology

Background:

  • Lung cancer progression is influenced by signaling molecules.
  • Interleukin-1 beta (IL-1beta) plays a role in cellular signaling.
  • Inducible nitric oxide synthase (iNOS) is implicated in cancer growth.

Purpose of the Study:

  • To investigate the effect of IL-1beta on iNOS expression in human lung carcinoma A549 cells.
  • To identify key signaling molecules involved in IL-1beta-mediated iNOS expression.
  • To establish the role of specific signaling pathways using chemical inhibitors.

Main Methods:

  • A549 cells were exposed to IL-1beta (10 ng/ml).
  • Expression of iNOS, phosphorylated STAT1/STAT3, MAPKs, Akt, NF-kappaB, and HIF-1alpha was analyzed.
  • Specific chemical inhibitors (piceatannol, AG-490, PD98059, SP600125) were used to block signaling pathways.

Main Results:

  • IL-1beta significantly induced iNOS expression in A549 cells.
  • IL-1beta activated STAT1, STAT3, MAPKs (ERK1/2, JNK1/2, p38), Akt, NF-kappaB, and HIF-1alpha.
  • Inhibitor studies indicated that IL-1beta-induced iNOS expression involves JAK-STAT and ERK/JNK pathways, among others.

Conclusions:

  • IL-1beta activates multiple signaling cascades, including JAK-STAT and MAPK pathways, leading to iNOS expression in lung cancer cells.
  • Targeting these broad signaling pathways with chemopreventive agents may offer a more effective strategy for lung cancer prevention and treatment than specific inhibitors.

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