[Transforming growth TGF-beta1 mediates the expression of stromal cell derived factor-1 in kidney interstitial fibroblast cells in rats].
OBJECTIVE
To study the expression pattern of SDF-1 in the NRK49F cells and the role of TGF-beta1 in mediating the expression of SDF-1.


METHODS
The SDF-1 mRNA and protein expression in the NRK49F cells with or without stimulating by TGF-beta1 was assayed with RT-PCR or Western blot or Immunohistochemistry.


RESULTS
The SDF-1 mRNA expression stimulated by TGF-beta1 appeared in a time-dependent manner. The peak value appeared at 24 hours and was (2.924 +/- 0.235) times as high as the initial level. The dose-course studies suggested that TGF-beta1 stimulation resulted in marked promotion of SDF-1 mRNA expression, which peaked at the concentration of 5 ng/mL. At this concentration, the expression of SDF-1 mRNA was (2.113 +/- 0.314) times as high as that of the control. Corresponding with the pattern of mRNA expression of SDF-1, protein expression of SDF-1 was observed in NRK49F cells. A time-dependent manner was also observed in the protein expression of SDF-1 stimulated by 5 ng/mL of TGF-beta1. The protein expression of SDF-1 at 36 hours was (2.572 +/- 0.238) times as high as that of the control. TGF-beta1 neutralizing antibody reduced the expression of SDF-1 protein.


CONCLUSIONS
SDF-1 expresses in NRK49F cells. TGF-beta1 up-regulates the mRNA and protein expressions of SDF-1 in NRK49F cells in a time- and concentration-dependent manner. As a chemokine, the increased expression of SDF-1 induced by TGF-beta1 may play an important role in renal inflammation and fibrosis.
Zhang
He-Ping
HP
Department of Nephrology, West China Hospital, Sichuan University, Chengdu 610041, China.
Xie
Xi-Sheng
XS
Zhang
Lei
L
Fan
Jun-Ming
JM
D000818:Animals; D002460:Cell Line; D054377:Chemokine CXCL12 / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D007668:Kidney / Q000166:cytology / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D053773:Transforming Growth Factor beta1 / Q000494:pharmacology*; D015854:Up-Regulation / Q000187:drug effects
D054377:Chemokine CXCL12; D012333:RNA, Messenger; D053773:Transforming Growth Factor beta1