Curcumin Heals Indomethacin-Induced GastricUlceration by Stimulation of Angiogenesisand Restitution of Collagen Fibers via VEGFand MMP-2 Mediated Signaling
2012
Aim:We examined the molecular mechanism of curcumin in a preventive and therapeutic model of indomethacininduced
gastric ulceration with regard to angiogenic processes. Results: Disrupted blood vessels, reduced collagen
matrices, and significant (60%) injury to mucosal cells were observed during ulceration. In addition, ulcerated
tissues exhibited decreased matrix metalloproteinase (MMP)-2 and vascular endothelial growth factor (VEGF)
expression in blood vessels. Interestingly, curcumin blocked ulceration by induction of collagenization and angiogenesis
in gastric tissues via upregulation of MMP-2, membrane type (MT) 1-MMP, VEGF, and transforming
growth factor (TGF)-b at protein and messenger ribonucleic acid (mRNA) levels. To examine the angiogenic
properties of curcumin, we employed a chorioallantoic membrane model and Matrigel assay. During healing,
curcumin promoted collagenization and angiogenesis as well as enhanced MMP-2 activity via positive MT1-MMP
regulation and negative tissue inhibitor of metalloproteinase-2 regulation. Innovation: Our study demonstrates
that curcumin-mediated healing is associated with increased MMP-2, TGF-b, and VEGF expression and that it
plays a pivotal role as an angiogenic modulator by stimulating vascular sprout formation and collagen fiber
restoration in ulcerated tissues. Conclusion: We conclude that curcumin remodels gastric tissues by restoring the
collagen architecture and accelerating angiogenesis.
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