Effects of the antagomiRs 15b and 200b on the altered healing pattern of diabetic mice

Abstract

Background and Purpose Diabetic patients with non‐healing ulcers have a reduced expression of VEGF. Genetically diabetic mice have an altered expression pattern of VEGF and its receptor, VEGF receptor 2 (VEGFR‐2). In diabetic wounds, the microRNAs, miR15b and miR200b, which respectively inhibit VEGF and VEGF‐R2 mRNAs, are up‐regulated, further affecting the impaired angiogenesis. We investigated whether anti‐miRs directed toward miR15b and miR200b could improve wound repair in genetically diabetic mice. Experimental Approach Skin wounds were produced on the backs of female diabetic mice. The anti‐miRs (antimiR15b, antimiR200b or antimiR15b/200b) at 10 mg·kg−1, or vehicle were applied to the wound edge. Mice were killed on days 7, 14 and at time of complete wound closure. Levels of mRNA and protein of angiogenic mediators and their receptors were measured with RT‐qPCR and Western blotting. Wounds were examined by histological and immunochemical methods. Key Results mRNA expression of VEGF, VEGFR‐2, angiopoietin‐1 and its receptor TEK were evaluated after 7 and 14 days. Protein levels of VEGF and transglutaminase II were measured at day 7, while VEGFR‐2 and Angiopoietin‐1 were measured at day 14. Histological features and the time to achieve a complete wound closure were also examined. Treatment with the anti‐miRs improved the analysed parameters and the co‐treatment resulted the most effective. Conclusion and Implications The results suggest that the inhibition of miR15b and miR200b may have a potential application in diabetes‐related wound disorders.

miR-153 inhibits the migration and the tube formation of endothelial cells by blocking the paracrine of angiopoietin 1 in breast cancer cells

“…In this study, miR-153 inhibited the migration and tube formation of endothelial cells through blocking the paracrine activity of ANG1 in MCF7 breast cancer cells under normoxia. In tumor angiogenesis, especially at the early stage, the VEGFA and the ANG1/Tie2 pathways play a synergistic role [ 18 , 20 , 21 , 31 , 32 ]. When VEGFA is blocked, the ANG1/Tie2 pathway is thought to be the major contributor to tumor angiogenesis and tumor growth [ 22 ].…”

Advances and Impact of Antioxidant Hydrogel in Chronic Wound Healing

“…Persistent inflammation leads to the destruction of physiological healing mechanism, which is one of the main characteristics of chronic wounds. Besides, macrophages and neutrophils accumulating in wounds secrete inflammatory cytokines, promote the production of metalloproteinase (MMP), and destroy wound healing . Meanwhile, the expression of vascular endothelial growth factor (VEGF) and platelet derived growth factor (PDGF) is also impaired .…”

MicroRNAs in diabetic wound healing: Pathophysiology and therapeutic opportunities

“…MiR-15b is induced in diabetic wounds in mice compared to non-diabetic controls. Treatment with MSCs led to improved diabetic wound healing, a significant decrease in miR-15b expression levels, and up-regulation of pro-angiogenic genes (54,55). A recent study demonstrated that the activity of inositol-requiring enzyme 1 (IRE1a), an endoribonuclease important in the endoplasmic reticulum-associated stress signals, is diminished in DM (56).…”