IN-1130, a novel transforming growth factor-beta type I receptor kinase (ALK5) inhibitor, suppresses renal fibrosis in obstructive nephropathy.

Abstract

The transforming growth factor-beta (TGF-beta) plays a central role in the progression of renal fibrosis. TGF-beta transduces its signal through the activin receptor-like kinase (ALK)5. IN-1130, a novel small molecule ALK5 inhibitor, inhibited the purified kinase domain of ALK5-mediated Smad3 phosphorylation with an IC(50) value of 5.3 nM. IN-1130 proved to be highly selective in a panel of 27 serine/threonine and tyrosine kinases including p38alpha mitogen-activated protein kinase. We evaluated the efficacy of IN-1130 to block renal fibrogenesis induced by unilateral ureteral obstruction (UUO) in rats. Either vehicle (saline) or IN-1130 (10 and 20 mg/kg/day) was intraperitoneally administered to UUO rats for 7 and 14 days. Phosphorylated Smad2 (pSmad2) and markers of fibrosis were analyzed in kidney tissues. In UUO control kidneys, interstitial fibrosis including tubular atrophy, loss and dilation, inflammatory cell infiltration, and fibroblast cell proliferation was prominent. These morphological changes were notably reduced by IN-1130 treatment. IN-1130 decreased levels of TGF-beta1 messenger RNA (mRNA), type I collagen mRNA, and pSmad2, compared to UUO control rats. As determined by measuring the hydroxyproline content, total kidney collagen amount was increased in UUO control kidneys, but significantly reduced by IN-1130 treatment, which was comparable to results of histochemical staining for collagen. IN-1130 also suppressed the expression of alpha-smooth muscle actin (alpha-SMA) and fibronectin in UUO kidneys. Our results show that IN-1130 suppressed the fibrogenic process of UUO, further underscoring the potential clinical benefits of IN-1130 in the treatment of renal fibrosis.

• Authors: J-A Moon, H-T Kim, I-S Cho, Y Y Sheen, D-K Kim
• Journal: Kidney international (Kidney Int) Vol. 70 Issue 7 Pg. 1234-43 (Oct 2006) ISSN: 0085-2538 [Print] United States
• PMID: 16929250 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Fibronectins
• RNA, Messenger
• Receptors, Transforming Growth Factor beta
• Smad2 Protein
• Smad3 Protein
• Tgfb1 protein, rat
• Transforming Growth Factor beta1
• Protein Kinases
• Protein Serine-Threonine Kinases
• Activin Receptors
• Activin Receptors, Type I
• Receptor, Transforming Growth Factor-beta Type I
• Tgfbr1 protein, rat

Topics

• Activin Receptors (antagonists & inhibitors)
• Activin Receptors, Type I (antagonists & inhibitors)
• Animals
• Atrophy
• Blotting, Western
• Data Interpretation, Statistical
• Disease Models, Animal
• Dose-Response Relationship, Drug
• Electrophoresis, Polyacrylamide Gel
• Female
• Fibronectins (analysis)
• Fibrosis
• Immunohistochemistry
• Kidney (metabolism, pathology)
• Kidney Diseases (etiology, genetics, metabolism, therapy)
• Kidney Tubules (pathology)
• Phosphorylation
• Polymerase Chain Reaction
• Protein Kinases (analysis, metabolism)
• Protein Serine-Threonine Kinases (antagonists & inhibitors)
• RNA, Messenger (analysis, metabolism)
• Rats
• Rats, Sprague-Dawley
• Receptor, Transforming Growth Factor-beta Type I
• Receptors, Transforming Growth Factor beta (genetics, metabolism)
• Smad2 Protein (genetics, metabolism)
• Smad3 Protein (genetics, metabolism)
• Transforming Growth Factor beta1 (antagonists & inhibitors, genetics, metabolism)
• Ureteral Obstruction (complications, metabolism, pathology, therapy)