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We have studied the effects of natural medicines on neurite outgrowth in PC12D cells in a cultured medium of C2C12 cells. Derived from mouse myoblasts, the C2C12 cells secrete neurotrophic factors including nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF) and neurotrophin-3 (NT-3). The secretion of these neurotrophins from C2C12 cells stimulate neurite outgrowth in PC12D cells. We have screened a total of 120 samples and found five natural medicines: Trichosanthes Root, Asiasarum Root, Lycium Bark, Sinomenium Stem, and Dictamni radicis Cortex, that enhance the activity of C2C12-cultured medium to stimulate neurite outgrowth in PC12D cells. These natural medicines promoted not only neurite outgrowth but also stabilized the neurite formation in PC12D cells for several days. RT-PCR analysis showed that NGF was significantly increased with Trichosanthes and Lycium Bark. However, BDNF was slightly decreased with Lycium Bark, Sinomenium Stem, and Dictamni radicis Cortex. NT-3 was increased slightly by all of these natural medicines except Sinomenium Stem. All these five natural medicines significantly increased the number and length of neurites in PC12D cells in co-culture with C2C12 cells.

Screening of natural medicines that efficiently activate neurite outgrowth in PC12 cells in C2C12-cultured medium