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Neem leaf extract induces radiosensitization in human neuroblastoma xenograft through modulation of apoptotic pathway. | LitMetric

Unlabelled: Induction of apoptosis is directly correlated with the biological effectiveness of ionizing radiation (IR). Accordingly, we investigated the efficacy of neem leaf extract (NLE) on IR-associated apoptotic transcriptional modulation and cell death in neuroblastoma (NB).

Materials And Methods: NB xenografts exposed to single dose (SDR, 10 Gy) or fractionated (FIR, 2 Gy/d×5d) with or without NLE were examined for transcriptional activation of 84 apoptotic pathway genes using quantitative polymerase chain reaction. Apoptosis was measured using TdT nick-end labeling.

Results: FIR induced 55 and suppressed 10 genes, while SDR induced 49 and suppressed 5 genes. Of these, 46 and 4 genes were commonly up/down-regulated after FIR and SDR. NLE inhibited IR-induced NAIP, BIRC6, BIRC8, NOL3 and enhanced BAK1, BAX, BCL10, CASP1, CASP10 CARD8 and CRADD. Furthermore, NLE conferred FIR- and SDR-induced cell death.

Conclusion: These data imply that NLE may exert radiosensitization by activating pro-apoptotic signaling and negating survival signaling and may thus potentiate radiotherapy in NB.

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