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Activity of matrix metalloproteinases in normal and transformed mouse fibroblasts exposed to antioxidants


The effects of two antioxidants on the activity of matrix metalloproteinases (MMP) secreted by normal (3T3) and transformed (3T3-SV40) mouse fibroblasts were examined. We compared the action of N-acetylcysteine (NAC) and alpha-lipoic acid (ALA) on two gelatinases, MMP-2 and MMP-9. Gel zymography demonstrated that activity of MMP-2 was higher in normal 3T3 cells, whereas, in transformed 3T3-SV40 cells, the MMP-9 activity was higher. NAC treatment for 2–6 h completely suppressed MMP-2 and MMP-9 activity in both cell lines. The inhibitory effect did not depend on NAC concentration within the range of 1–10 mM. ALA (1.2 mM) did not affect the cells very dramatically; it decreased the MMP-2 activity in both types of cells. MMP-9 activity in the presence of ALA was decreased in 3T3 cells and slightly increased in 3T3-SV40 cells. The activity of the membrane bound and intracellular MMP was not changed under the same conditions. In conclusion, the altered activity of MMP in the presence of antioxidant may influence the intracellular signaling and cell functions.

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matrix metalloproteinase


alpha-lipoic acid


reduced glutathione




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Correspondence to I. A. Gamaley.

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Original Russian Text © I.V. Voronkina, K.M. Kirpichnikova, L.V. Smagina, I.A. Gamaley, 2008, published in Tsitologiya, Vol. 50, No. 12, 2008, pp. 877–881.

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Voronkina, I.V., Kirpichnikova, K.M., Smagina, L.V. et al. Activity of matrix metalloproteinases in normal and transformed mouse fibroblasts exposed to antioxidants. Cell Tiss. Biol. 3, 56–60 (2009).

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