Molecular and Cellular Biochemistry

, Volume 317, Issue 1–2, pp 151–159 | Cite as

Inhibitory effect of 30-kDa phytoglycoprotein on expression of TNF-α and COX-2 via activation of PKCα and ERK 1/2 in LPS-stimulated RAW 264.7 cells

  • Sei-Jung Lee
  • Kye-Taek Lim


A 30-kDa DBD glycoprotein, which consists of carbohydrate content (61%) and protein content (39%), is a naturally occurring phytoglycoprotein found in Dioscorea batatas Decne (DBD). In the present study, we investigated the anti-inflammatory potentials of the DBD glycoprotein on lipopolysaccharide (LPS, 2 μg/ml)-induced pro-inflammatory signal transduction cascade in murine macrophage cell line (RAW 264.7 cells). Our results showed that the DBD glycoprotein significantly inhibits the translocation of protein kinase C alpha (PKCα) to membrane and the phosphorylation of extracellular signal-regulated kinase (ERK) in LPS-stimulated RAW 264.7 cells. We also found that the DBD glycoprotein (200 μg/ml) has suppressive effects on the DNA binding activities of nuclear factor-kappa B (NF-κB), on the expression of p50, p65, tumor necrosis factor (TNF)-α, and cyclooxygenase (COX)-2, and on the production of superoxide anion radical (\( {\text{O}}_{ 2} ^{{ \bullet - }} \)) in LPS-stimulated RAW 264.7 cells. Interestingly, the expression of TNF-α and COX-2 was significantly blocked by treatment with PKC inhibitor (Staurosporine) as well as ERK1/2 inhibitors (PD98059). Collectively, we assume that the DBD glycoprotein has anti-inflammatory potential, which can modulate pro-inflammatory signal transduction cascade in LPS-stimulated RAW 264.7 cells.


DBD glycoprotein ERK1/2 TNF-α COX-2 RAW 264.7 cells 



This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (KRF-2006-311-F00108).


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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  1. 1.Molecular Biochemistry Laboratory, Biotechnology Research Institute and Center for the Control of Animal Hazards Using Biotechnology (BK 21)Chonnam National UniversityKwang-juSouth Korea
  2. 2.Molecular Biochemistry Laboratory, Biotechnology Research InstituteChonnam National UniversityKwang-juSouth Korea

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