Preprint Article Version 1 This version is not peer-reviewed

Differential Role of TGF-β in Extracellular Matrix Regulation during Trypanosoma cruzi—Host Cell Interaction

Version 1 : Received: 12 May 2019 / Approved: 14 May 2019 / Online: 14 May 2019 (12:28:59 CEST)

How to cite: Silva, T.A.; Ferreira, L.F.D.C.; Pereira, M.C.D.S.; Calvet, C.M. Differential Role of TGF-β in Extracellular Matrix Regulation during Trypanosoma cruzi—Host Cell Interaction. Preprints 2019, 2019050171 (doi: 10.20944/preprints201905.0171.v1). Silva, T.A.; Ferreira, L.F.D.C.; Pereira, M.C.D.S.; Calvet, C.M. Differential Role of TGF-β in Extracellular Matrix Regulation during Trypanosoma cruzi—Host Cell Interaction. Preprints 2019, 2019050171 (doi: 10.20944/preprints201905.0171.v1).

Abstract

Transforming growth factor beta (TGF-β) is a determinant for inflammation and fibrosis in cardiac and skeletal muscle in Chagas disease. To determine its regulatory mechanisms, we investigated the response of T. cruzi-infected cardiomyocytes (CM), cardiac fibroblasts (CF) and L6E9 skeletal myoblasts to TGF-β. Cultures of CM, CF and L6E9 were infected with T. cruzi (Y strain) and treated with TGF-β (1–10 ng/mL, 1h or 48 h). Fibronectin (FN) distribution was analyzed by immunofluorescence and Western blot (WB). Phosphorylated SMAD2 (PS2), phospho-p38 (p-p38), and phospho-c-Jun (p-c-Jun) signaling were evaluated by WB. CF and L6E9 showed an increase in FN from 1 ng/mL of TGF-β, while CM displayed FN modulation only after 10 ng/mL treatment. CF and L6E9 showed higher PS2 levels than CM, while p38 is less stimulated in CF than CM and L6E9. After T. cruzi infection, localized FN disorganization was observed in infected CF and L6E9. T. cruzi induced an increase in FN in CF cultures, mainly in uninfected cells. Infected CF cultures treated with TGF-β showed a reduction in PS2 and an increase in p-p38 and p-c-Jun levels. Our data suggest that p38 and c-Jun pathways may be participating in the fibrosis regulatory process mediated by TGF-β after T. cruzi infection.

Subject Areas

Trypanosoma cruzi; TGF-β; heart fibrosis; extracellular matrix; signaling pathways; SMAD2; p-38 MAPK; c-Jun

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