In Vitro Effects of Amygdalin on Proliferation and Apoptosis in SH-SY5Y Neuroblastoma Cells

Neuroblastoma represents the most common extracranial solid tumor in childhood and is associated with a poor prognosis in high-risk cases. Amygdalin, a naturally occurring cyanogenic glycoside, has been reported to exhibit anti-tumor properties in various cancer models; however, its effects on neuroblastoma cells remain insufficiently characterized. The present study was conducted with the objective of investigating the effects of amygdalin on cell proliferation, apoptosis, and invasion in SH-SY5Y neuroblastoma cells in vitro.

The SH-SY5Y neuroblastoma cells were cultivated under the optimal conditions for their growth. The cytotoxic effect of amygdalin was determined using the CCK8 assay, which is dose- and time-dependent. Total RNA isolation was performed using Trizol. Subsequently, a process of cDNA synthesis was initiated. The real-time PCR method was utilized to ascertain alterations in the expression levels of mRNA molecules associated with apoptosis, namely Bax, Bcl2, caspase-3, caspase-7, caspase-8, caspase-9, caspase-10, NFkB, and invasion-related genes MMP2, MMP9, TIMP1, and TIMP3. Furthermore, alterations in NFkB levels were examined through the utilization of the ELISA method.

The IC50 value of amygdalin in SH-SY5Y cells was determined to be 112.7 µM at 24 h. Amygdalin demonstrated a dose-dependent cytotoxic effect on neuroblastoma cells. Furthermore, the study revealed that the drug induced apoptosis through the upregulation of BAX and BID, and the downregulation of BCL-2 and NF-κB. This process led to a reduction in cell proliferation. Furthermore, the study demonstrated an anti-invasive effect through the downregulation of MMP9 and the upregulation of TIMP1 and TIMP3. In addition, a substantial decrease in NF-κB protein concentration was observed.

These findings demonstrate that amygdalin exerts anti-proliferative, pro-apoptotic, and anti-invasive effects in SH-SY5Y neuroblastoma cells in vitro. Amygdalin may represent a promising natural compound for further investigation as a potential therapeutic agent in neuroblastoma.