Presence of metalloproteinases 2 and 9 and 8-OHdG in the fibrotic process in skeletal muscle of Mdx mice

Author(s)

de Souza, Lidiane Begalli ^[1] ; Maziero, Carla ^[1] ; Lazzarin, Mariana Cruz ^[1] ; Quintana, Hananiah Tardivo ^[1] ; Tome, Tabata de Carvalho ^[1] ; de Araujo Baptista, Vivianne Izabelle ^[1] ; de Oliveira, Flavia ^[1]

Affiliation

^[1] Univ Fed Sao Paulo, Dept Biociencias, Campus Baixada Santista, Santos, SP - Brazil

• Document type: Journal article
• Source: ACTA HISTOCHEMICA; v. 122, n. 1 JAN 2020.
• Web of Science Citations: 0

Abstract

Inflammation and oxidative stress occurs in muscle of Duchenne muscular dystrophy (DMD). The relationship between a panel of biomarkers and the DMD outcome is necessary to indicate of disease progression and response to rehabilitation programs. The aim was to analyze the connective tissue of muscle of Mdx mice and immunoexpression of MMP-2, MMP-9, and 8-OHdG, which signalizes oxidative stress related to DNA damage. Biceps brachii of male C57BL/10 and C57BL/10-Dmd(mdx) mice was submitted to Hematoxylin-Eosin, Sirius red and immunohistochemistry (MMP-2, MMP-9 and 8-OHdG) analysis. Mdx showed focal lesions with intense inflammation and fibrosis related to immunoexpression of MMP-2 and MMP-9, proving the hypothesis that these MMPs are linked to muscular tissue degeneration, which can be regenerated by their inhibition, improving the treatment of DMD carriers. Histopathological findings related to centralized nuclei increase were related to higher 8-OHdG immunomarked nuclei in Mdx, which signalizes oxidative stress associated with DNA damage provoked by DMD. Such result shows that the evaluation of 8-OHdG during the evolution of the disease could be a method to evaluate DMD disease progression. (AU)

• FAPESP's process: 14/22211-6 - Regeneration process characteristics of skeletal muscle of different embryological origins in mdx mice submitted to aerobic exercise
• Grantee: Mariana Cruz Lazzarin
• Support Opportunities: Scholarships in Brazil - Master