Ginkgo bilobα studies have focused on the anti-inflammatory effects of the major components, ginkgolide and bilobalide, whereas little is known about their effect on fibroblasts. This study demonstrated the enhancing effects of Ginkgo L. extracts, especially the fiavonoid fractions: quercetin, kaempfe-rol, sciadopitysin, ginkgetin, isoginkgetin, on the proliferation of normal human skin fibroblast in vitro measured by MTT (3-[4,5-dimethylthiazole-2-yl]-2,5-diphenyl-tetrazolium bromide) assay and direct hemocytometer cell count. Furthermore, increased production of collagen and extracellular fi-bronectin were documented by radioisotope (2,3-3H-proline) incorporated collagen assay, procollagen type I C-peptide assay and by immunoturbidimetric assay. These proliferative effects suggest another useful pharmacologic application of Ginkgo L. extracts in addition to their well-known anti-inflammatory effect.

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