TY - JOUR T1 - Partial Protection of Paclitaxel-induced Neurotoxicity by Antioxidants JF - In Vivo JO - In Vivo SP - 745 LP - 752 DO - 10.21873/invivo.11303 VL - 32 IS - 4 AU - YAEKO HARA AU - HIROSHI SAKAGAMI AU - HAIXIA SHI AU - TOMOYUKI ABE AU - NOBUAKI TAMURA AU - HIROSHI TAKESHIMA AU - NORIO HORIE AU - TAKAHIRO KANEKO AU - HIROSHI SHIRATSUCHI AU - TADAYOSHI KANEKO Y1 - 2018/07/01 UR - http://iv.iiarjournals.org/content/32/4/745.abstract N2 - Background/Aim: In order to search for substances that reduce the neurotoxicity of paclitaxel, the sensitivity of differentiated rat neuronal PC12 cells to paclitaxel was compared to that of malignant and non-malignant cells, and the extent to which four antioxidants can alleviate paclitaxel-induced neurotoxicity was investigated. Materials and Methods: Viability of cells was determined by the MTT method. Cytotoxicity was evaluated as the concentration that reduced cell viability by 50% (CC50). Tumor specificity of paclitaxel was determined as the ratio of CC50 against non-malignant cells to that against malignant cells. Results: Paclitaxel was three-fold more cytotoxic towards human oral squamous cell carcinoma cell lines (Ca9-22, HSC-2, HSC-3. HSC-4) than human normal epithelial and mesenchymal (human gingival fibroblast, human periodontal ligament fibroblast, human pulp cell) normal cells, confirming its antitumor potential. However, paclitaxel at as low a concentration as 5 ng/ml significantly reduced neurite formation in nerve growth factor-induced differentiated PC12 cells, although complete killing of cells was not achieved even at 2,000-fold higher concentration (10 μM). Paclitaxel-induced neurotoxicity was enhanced with the prolongation of incubation time and reduction of inoculation cell density. Four antioxidants, namely docosahexaenoic acid, acetyl-L-carnitine hydrochloride, N-acetyl-L-cysteine and sodium ascorbate, only partially protected PC12 cells from paclitaxel-induced toxicity. Conclusion: The present study suggests the involvement of both oxidative and other mechanisms in paclitaxel-induced neurotoxicity. ER -