AP-1 regulates TGF-beta1-induced secretion of Type I collagen in human lung fibroblasts.
- Author:
Yong-bin HU
1
;
Qing-fu ZENG
;
De-yun FENG
;
Xiang LI
;
Jin-wu PENG
Author Information
1. Department of Pathology, School of Basic Medicine, Central South University, Changsha 410013, China.
- Publication Type:Journal Article
- MeSH:
Cell Line;
Collagen Type I;
metabolism;
Fibroblasts;
cytology;
drug effects;
metabolism;
Humans;
Lung;
cytology;
Signal Transduction;
Transcription Factor AP-1;
metabolism;
Transforming Growth Factor beta1;
pharmacology
- From:
Journal of Central South University(Medical Sciences)
2007;32(5):776-781
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To investigate the role of AP-1 in the secretion of Type I collagen in TGF-beta1-stimulated human lung fibroblasts.
METHODS:Human lung fibroblasts cell line (HLF-02) was cultured, and then stimulated with 10 microg/L TGF-beta1 at different time points. Curcumin was added into the culture medium to inhibit the AP-1 activity before incubating with TGF-beta1. AP-1 DNA binding activity was assayed by electrophoretic mobility shift assay (EMSA), and the expression of Type I collagen was detected by Western blot and RT-PCR.
RESULTS:TGF-beta1 could induce the transcription and secretion of Type I collagen in HLF-02 cells(P<0.05). TGF-beta1 could upregulate the AP-1 DNA binding activity ( P<0.05). Curcumin ( 5, 10, 15, and 20 micromol/L) could inhibit the AP-1 DNA binding activity in TGF-beta1-stimulated cells (the inhibition ratio was 17.1%, 17.6%, 24.2%, and 31.3%; P<0.05). Curcumin (5, 10, 15, and 20 micromol/L) could also inhibit the secretion of Type I collagen significantly (the inhibition ratio was 62.1%, 58.8%, 62.1%, and 59.6%; P<0.05).
CONCLUSION:AP-1 is responsible for the secretion of TGF-beta1-induced Type I collagen in human lung fibroblasts.
