Abstract
Clinical study reports hearing loss in patients with low folic acid (FA) and elevated homocysteine (Hcy). We hypothesize that elevated Hcy induces imbalance in matrix turnover and oxidative stress in cochlea. Cystathione β-synthase heterozygous knockout mice were used as model for hyperhomocysteinemia. Matrix remodeling induced by Hcy resulted from elevated MMP-2, -9, and -14. MMP-2 and -9 showed elevated gelatinase activity in CBS (+/−) cochlea. Tissue inhibitors of matrix metalloproteinase were significantly lower in CBS (+/−) cochlea. The expression analyses for MMPs and TIMPs were equally represented at protein and mRNA levels. Cochlea of CBS mice showed following structural changes; (1) detachment of tectorial membrane lying on hair cells (2) thinner s. vascularis (3) large fibroblast in spiral ligament. Hcy induced higher protein nitrotyrosination and cytosolic NADPHoxidase subunit p22phox in cochlea. It is thus suggested that Hcy induced matrix imbalance, structural changes and oxidative stress in cochlea.
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Abbreviations
- CBS:
-
Cystathione-beta synthase
- MMP:
-
Matrix metalloproteinase
- TIMP:
-
Tissue inhibitors of matrix metalloproteinase
- Hcy:
-
Homocysteine
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Acknowledgments
A part of this study was supported by NIH grants- HL-71010; HL-74185; HL-88012; and NS-51568.
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Kundu, S., Tyagi, N., Sen, U. et al. Matrix imbalance by inducing expression of metalloproteinase and oxidative stress in cochlea of hyperhomocysteinemic mice. Mol Cell Biochem 332, 215–224 (2009). https://doi.org/10.1007/s11010-009-0194-2
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DOI: https://doi.org/10.1007/s11010-009-0194-2