[Expression of connective tissue growth factor and low density lipoprotein receptor related protein induced by transforming growth factor beta 1 in human pulmonary fibroblasts-1].
OBJECTIVE
To investigate the tendency and correlation between connective tissue growth factor (CTGF) and low density lipoprotein receptor-related protein (LRP) in human pulmonary fibroblasts-1 (HPF-1) induced by transforming growth factor beta1 (TGF-beta1) at different times.


METHODS
After the HPF-1 cells were stimulated with TGF-beta1 (5 microg/L) at different times (0 h, 3 h, 6 h,12 h and 24 h),CTGF and LRP mRNA expressions were analyzed by RT-PCR. The same preparation steps of cell culture were repeated, then, the protein expressions were determined by Western Blot, co-immunoprecipitation Western Blot and immunocytochemistry.


RESULTS
The expressions of CTGF and LRP mRNA had similar tendency, and LRP (224.87 +/- 7.00) correlated with CTGF (131.53 +/- 2.86) positively (r = 0.8402, P < 0.05). Furthermore, the protein expression levels had significant difference between 0 h (190.85 +/- 2.86) and 3 h (222.45 +/- 3.66) groups (F = 18.06, P < 0.01),and by immunoprecipitation, it was discovered that the quantity of CTGF bounded to LRP changes, which was similar to the result of LRP western blot. The analysis of immunocytochemistry disclosed the like results as well (3 h: 88.66 +/- 15.72, 0 h: 27.56 +/- 6.72, F = 244.36, P < 0.01).


CONCLUSIONS
The expression of LRP coincides with that of CTGF at the same stimulated time point of TGF-beta1. It suggests that LRP may be involved in the biological process of CTGF. And further research about LRP may provide a new direction to pulmonary fibrosis therapy.
Wang
Yan
Y
Department of Geriatrics, Peking University First Hospital, Beijing100034, China.
Liu
Xin-min
XM
D015153:Blotting, Western; D002478:Cells, Cultured; D055513:Connective Tissue Growth Factor; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D017874:Immediate-Early Proteins / Q000096:biosynthesis* / Q000235:genetics; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D036341:Intercellular Signaling Peptides and Proteins / Q000096:biosynthesis* / Q000235:genetics; D026503:Low Density Lipoprotein Receptor-Related Protein-1 / Q000096:biosynthesis* / Q000235:genetics; D008168:Lung / Q000166:cytology / Q000196:embryology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D053773:Transforming Growth Factor beta1 / Q000494:pharmacology*
C526317:CCN2 protein, human; D017874:Immediate-Early Proteins; D036341:Intercellular Signaling Peptides and Proteins; D026503:Low Density Lipoprotein Receptor-Related Protein-1; D012333:RNA, Messenger; D053773:Transforming Growth Factor beta1; D055513:Connective Tissue Growth Factor