Impact of proteasome inhibitor MG‑132 on expression of NF‑κB, IL‑1β and histological remodeling after myocardial infarction

Wu, Xinhua; Chen, Zhangrong; Yang, Ying; Dong, Yu; Liu, Hong; Kuang, Shiquan; Luo, Kun

doi:10.3892/etm.2018.6308

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…64 Hence, when MMP-2 expression was reduced with IL-1b, an increase in collagen synthesis was found. 63 In the present study, we observed in PPNL-treated groups, regardless of the suture technique, a decrease in MMP-2 expression and an increase in collagen synthesis, mainly type I. We speculate that PPNL action is mediated by immune cells; however, the PPNL anti-inflammatory effect did not alter MMP-9 levels.…”

Section: Discussioncontrasting

confidence: 41%

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Application of a Purified Protein From Natural Latex and the Influence of Suture Type on Achilles Tendon Repair in Rats

et al. 2019

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Background: The prolonged tendon-healing process, the high costs associated with treatment, the increase in the number of injuries over the past decades, and the lack of consensus on the optimal treatment of tendon injuries are a global problem. Restoring the normal tendon anatomy and decreasing the healing time are key factors for treatment advancement. Hypothesis: Application of a purified protein from natural latex (PPNL) accelerates the healing process, increasing collagen synthesis and decreasing metalloproteinases. PPNL associated with a simpler suture technique should decrease the healing time. Study Design: Controlled laboratory study. Methods: Injury, surgery, and treatment with PPNL were conducted with male Sprague-Dawley rats. Two suture techniques were used: U-suture, a simpler and lesser traumatic technique, and Kessler-Tajima, to avoid strangulation of the microcirculation. Achilles tendons were completely sectioned, and 100 µL of 0.1% PPNL was applied on the tendon during surgery. Tendon morphology, distribution, and quantity of collagen types I and III, as well as expression of TIMP-1, TIMP-2, MMP-2, and MMP-9 and ultrastructural aspects of cells and collagen fibrils, were assessed after 2 and 4 weeks. Results: PPNL treatment improved collagen type I synthesis and reduced MMP-2 expression. All groups showed a 6.8-times increase in tendon weight as compared with the control group after 2 weeks and a 5.2-times increase after 4 weeks. All groups showed an increase in diameter after 4 weeks, except for the ones treated with PPNL, which showed a slight reduction in diameter. The peak of concentration of collagen fibrils with a 80-nm diameter was 27.79% in the control group; all other experimental groups presented fibrils between 50 and 60 nm. However, the best results were observed with Kessler-Tajima suture associated with PPNL. Conclusion/Clinical Relevance: There are no known medicines or substances capable of aiding the tendon healing process besides surgery. The discovery of a substance able to improve this process and decrease its duration represents an important advancement in orthopaedic medicine.

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Section: Discussioncontrasting

confidence: 41%

“…64 Hence, when MMP-2 expression was reduced with IL-1β, an increase in collagen synthesis was found. 63…”

Section: Discussionmentioning

confidence: 99%