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The Pharmaceutical Society of Korea (대한약학회)
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Modulation of Cell Proliferation and Hypertrophy by Gangliosides in Cultured Human Glomerular Mesangial Cells

  • Lee Seoul (Department of Pharmacology, Wonkwang University School of Medicine) ;
  • Ahn Seon Ho (Division of Nephrology, Department of Internal Medicine, Wonkwang University School of Medicine) ;
  • Baek Seung Hoon (Division of Nephrology, Department of Internal Medicine, Wonkwang University School of Medicine) ;
  • Song Ju Hung (Division of Nephrology, Department of Internal Medicine, Wonkwang University School of Medicine) ;
  • Choo Young Kug (Division of Biological Science, College of Natural Science, Wonkwang University) ;
  • Kwon Oh Deog (College of Veterinary Medicine, Kyungpook National University) ;
  • Choi Bong Kyu (Department of Pharmacology, Wonkwang University School of Medicine) ;
  • Jung Kyu Yong (Department of Pharmacology, Wonkwang University School of Medicine)
  • Published : 2005.08.01
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Abstract

Glomerular mesangial cells (GMCs) in diverse renal diseases undergo cell proliferation and/or hypertrophy, and gangliosides have been reported to play an important role in modulating cell structure and function. This study compared the effects of transforming growth $factor-\beta\; (TGF­\beta1)$ and the effects of the application of exogenous gangliosides on GMCs and investigated whether the application of exogenous gangliosides regulated cellular proliferation and hypertrophy. Human GMCs were cultured with exogenous gangliosides and $TGF-\beta1$ in a media containing $10\%$ fetal bovine serum and in a media without the fetal bovine serum. Exogenous gangliosides biphasically changed the proliferation of human GMCs (0.1-1.0 mg/mL). A low concentration (0.1 mg/mL) of gangliosides mainly increased the number of human GMCs, whereas cellular proliferation was significantly reduced by raising the concentration of exogenous gangliosides. $TGF-\beta1$ greatly reduced the number of human GMCs in a concentration­dependent manner (1-10 ng/mL). Serum deprivation accelerated the gangliosides- and $TGF­\beta1-induced$ inhibition of mesangial cell proliferation to a greater extent. Gangliosides (1.0 mg/ mL) and $TGF-\beta1$ (10 ng/mL) both caused a significant increase in the incorporation of $[^3H]leucine$ per cell in the serum-deprived condition, whereas it was completely reversed in serum­supplemented condition. Similar results to the $[^3H]leucine$ incorporation were also observed in the changes in cell size measured by flow cytometric analysis. These results show that exogenous gangliosides modulate cell proliferation and hypertrophy in cultured human GMCs, and these cellular responses were regulated differently based on whether the media contained serum or not. Results from the present study raise new possibilities about the potential involvement of gangliosides in the development of mesangial cell proliferation and hypertrophy.

Keywords

References

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