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10.1007/s00109-014-1211-9

http://scihub22266oqcxt.onion/10.1007/s00109-014-1211-9
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suck abstract from ncbi


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pmid25345602      J+Mol+Med+(Berl) 2015 ; 93 (3): 289-302
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  • Angiotensin II Stimulates Canonical TGF? Signaling Pathway through Angiotensin Type 1 Receptor to Induce Granulation Tissue Contraction #MMPMID25345602
  • Ehanire T; Ren L; Bond J; Medina M; Li G; Bashirov L; Chen L; Kokosis G; Ibrahim M; Selim A; Blobe GC; Levinson H
  • J Mol Med (Berl) 2015[Mar]; 93 (3): 289-302 PMID25345602show ga
  • Hypertrophic scar contraction (HSc) is caused by granulation tissue contraction propagated by myofibroblast and fibroblast migration and contractility. Identifying the stimulants that promote migration and contractility are key to mitigating HSc. AngiotensinII (AngII) promotes migration and contractility of heart, liver, and lung fibroblasts; thus, we investigated the mechanisms of AngII in HSc. Human scar and unwounded dermis were immunostained for AngII receptors AT1-receptor and AT2-receptor, and analyzed for AT1-receptor expression using western blot. In-vitro assays of fibroblast contraction and migration under AngII stimulation were conducted with AT1-receptor, AT2-receptor, p38, JNK, MEK, and ALK5 antagonism. Excisional wounds were created on AT1-receptor KO and WT mice treated with AngII ± Losartan, and ALK5 and JNK inhibitors SB-431542 and SP-600125 respectively. Granulation tissue contraction was quantified and wounds analyzed by immunohistochemistry. AT1-receptor expression was increased in scar, but not unwounded tissue. AngII induced fibroblast contraction and migration through AT1-receptor. Cell migration was inhibited by ALK5 and JNK, but not p38 or MEK blockade. In-vivo experiments determined that absence of AT1-receptor and chemical AT1-receptor antagonism diminished granulation tissue contraction while AngII stimulated wound contraction. AngII granulation tissue contraction was diminished by ALK5 inhibition, but not JNK. AngII, promotes granulation tissue contraction through AT1-receptor and downstream canonical TGF? signaling pathway; ALK5. Further understanding the pathogenesis of HSc as an integrated signaling mechanism could improve our approach to establishing effective therapeutic interventions.
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