Abstract
Homocysteine thiolactone is a highly reactive homocysteine derivative that can react easily with proteins. Protein homocysteinylation has been suggested as a possible mechanism underlying the pathological consequences of impaired homocysteine metabolism. Homocysteine inhibits key steps of angiogenesis and tumor invasion. It can be hypothesized that homocysteine thiolactone could mimic the described anti-angiogenic and anti-invasive effects of homocysteine. Therefore, we studied the effects of homocysteine thiolactone on different key steps of angiogenesis and tumor invasion, using model endothelial and tumor cell lines. This study demonstrates that homocysteine thiolactone, in high contrast to homocysteine, is not an anti-angiogenic compound. Furthermore, our results suggest that homocysteine thiolactone could behave as a pro-angiogenic compound.
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