TY - JOUR
T1 - Rapamycin inhibits platelet-derived growth factor-induced collagen, but not fibronectin, synthesis in rat mesangial cells
AU - Kim, Myoung Soo
AU - Park, Jehyun
AU - Ha, Hunjoo
AU - Kim, Yu Seun
AU - Kang, Shin Wook
AU - Jeong, Hyeon Joo
AU - Kang, Duk Hee
AU - Yang, Chul Woo
PY - 2004/12/31
Y1 - 2004/12/31
N2 - Rapamycin, a macrocyclic lactone, is effective in reducing the incidence of acute rejection after renal transplantation. The inhibitory effects of rapamycin on lymphocyte proliferation and the molecular mechanisms that were involved have been described. However, its effects on glomerular mesangial cells have not been clearly understood, and here, we examined the effect of rapamycin on platelet-derived growth factor (PDGF)-induced extracellular matrix synthesis as well as cell proliferation in mesangial cells. Rat mesangial cells were isolated from the glomeruli of Sprague-Dawley rats and cultured with Dulbecco's modified Eagles medium containing 20% fetal bovine serum. Different concentrations of rapamycin were administered 1 hour before the addition of 10ng/ml of PDGF into growth arrested and synchronized cells. Cell proliferation was assessed by [3H]thymidine incorporation, total collagen synthesis by [3H]proline incorporation, and fibronectin secretion into the medium by Western blot analysis. In the mesangial cells, PDGF increased cell proliferation by 4.6-fold, total collagen synthesis by 1.8-fold, and fibronectin secretion by 3.2-fold. Rapamycin above 10 nM significantly inhibited PDGF-induced proliferation and collagen synthesis, but the treatment of rapamycin up to 1 μM did not show any significant effects on PDGF-induced fibronectin secretion. These inhibitory effects of rapamycin on PDGF-induced mesangial cell proliferation and collagen synthesis reflect the potential value of rapamycin in the prevention and treatment of glomerulosclerosis in patients with chronic allograft nephropathy.
AB - Rapamycin, a macrocyclic lactone, is effective in reducing the incidence of acute rejection after renal transplantation. The inhibitory effects of rapamycin on lymphocyte proliferation and the molecular mechanisms that were involved have been described. However, its effects on glomerular mesangial cells have not been clearly understood, and here, we examined the effect of rapamycin on platelet-derived growth factor (PDGF)-induced extracellular matrix synthesis as well as cell proliferation in mesangial cells. Rat mesangial cells were isolated from the glomeruli of Sprague-Dawley rats and cultured with Dulbecco's modified Eagles medium containing 20% fetal bovine serum. Different concentrations of rapamycin were administered 1 hour before the addition of 10ng/ml of PDGF into growth arrested and synchronized cells. Cell proliferation was assessed by [3H]thymidine incorporation, total collagen synthesis by [3H]proline incorporation, and fibronectin secretion into the medium by Western blot analysis. In the mesangial cells, PDGF increased cell proliferation by 4.6-fold, total collagen synthesis by 1.8-fold, and fibronectin secretion by 3.2-fold. Rapamycin above 10 nM significantly inhibited PDGF-induced proliferation and collagen synthesis, but the treatment of rapamycin up to 1 μM did not show any significant effects on PDGF-induced fibronectin secretion. These inhibitory effects of rapamycin on PDGF-induced mesangial cell proliferation and collagen synthesis reflect the potential value of rapamycin in the prevention and treatment of glomerulosclerosis in patients with chronic allograft nephropathy.
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U2 - 10.3349/ymj.2004.45.6.1121
DO - 10.3349/ymj.2004.45.6.1121
M3 - Article
C2 - 15627306
AN - SCOPUS:12344264944
VL - 45
SP - 1121
EP - 1126
JO - Yonsei Medical Journal
JF - Yonsei Medical Journal
SN - 0513-5796
IS - 6
ER -