Lipoxin A4 inhibits proliferation of human lung fibroblasts induced by connective tissue growth factor

Am J Respir Cell Mol Biol. 2006 Jan;34(1):65-72. doi: 10.1165/rcmb.2005-0184OC. Epub 2005 Sep 1.


Connective tissue growth factor (CTGF) plays an important role in pathways leading to lung fibrosis via the mitogenic action of CTGF on fibroblasts. Studies have shown that lipoxin A4 (LXA4) inhibits proliferation of renal mesangial cells induced by leukotriene D4 or platelet-derived growth factor. This study investigates the regulatory role of LXA4 on proliferation of human lung fibroblasts (HLF) induced by CTGF and mechanisms of LXA4 action. CTGF induced HLF proliferation; enhanced the expression of cyclin D1; phosphorylated extracellular signal-regulated kinase (ERK)1/2, phosphoinositide 3-kinase (PI3-K), protein kinase B (PKB), and DNA-binding activity of signal transducers and activators of transcription-3 (STAT3); and inhibited expression of p27(kip1). LXA4 downregulated the CTGF-stimulated HLF proliferation and expression of cyclin D1; and phosphorylated ERK1/2, PI3-K, PKB, and DNA-binding activity of STAT3. CTGF-induced decrement in expression of p27(kip1) was ameliorated by LXA4. PI3-K or STAT blockade but not ERK1/2 blockade partially inhibited the CTGF-activated proliferation of HLF. Transfection of the human LXA4 receptor gene into HLF intensified the inhibition of LXA4 on CTGF-induced cell proliferation. These results demonstrate that CTGF induces proliferation of HLF via upregulation of PI3-K/PKB, STAT3, and cyclin D1, and downregulation of p27(kip1). LXA4 inhibits these effects of CTGF on HLF.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Cycle / physiology
  • Cell Line
  • Cell Proliferation*
  • Connective Tissue Growth Factor
  • Cyclin D1 / metabolism
  • Cyclin-Dependent Kinase Inhibitor p27 / metabolism
  • Extracellular Signal-Regulated MAP Kinases / metabolism
  • Fibroblasts / cytology
  • Fibroblasts / physiology*
  • Humans
  • Immediate-Early Proteins / metabolism*
  • Intercellular Signaling Peptides and Proteins / metabolism*
  • Intracellular Signaling Peptides and Proteins / metabolism
  • Lipoxins / metabolism*
  • Lung / cytology*
  • Phosphatidylinositol 3-Kinases / metabolism
  • Proto-Oncogene Proteins c-akt / metabolism
  • RNA, Messenger / metabolism
  • Receptors, Formyl Peptide / genetics
  • Receptors, Formyl Peptide / metabolism
  • Receptors, Lipoxin / genetics
  • Receptors, Lipoxin / metabolism
  • STAT3 Transcription Factor / metabolism
  • Signal Transduction / physiology


  • CCN2 protein, human
  • CDKN1B protein, human
  • FPR2 protein, human
  • Immediate-Early Proteins
  • Intercellular Signaling Peptides and Proteins
  • Intracellular Signaling Peptides and Proteins
  • Lipoxins
  • RNA, Messenger
  • Receptors, Formyl Peptide
  • Receptors, Lipoxin
  • STAT3 Transcription Factor
  • STAT3 protein, human
  • lipoxin A4
  • Cyclin D1
  • Connective Tissue Growth Factor
  • Cyclin-Dependent Kinase Inhibitor p27
  • Phosphatidylinositol 3-Kinases
  • Proto-Oncogene Proteins c-akt
  • Extracellular Signal-Regulated MAP Kinases