Azadirachta indica modulates electrical properties and type of cell death in NDEA-induced hepatic tumors.

Tissue electrical conductivity is an important indicator of tissue structure and composition. Present study demonstrates modulatory effect of Azadirachta indica on the electrical conductivity and cell death in hepatic tumors. Hepatic tumors were generated by intraperitoneal injection of N-nitrosodiethylamine (cumulative dose: 200 μg/g body mass) to male BALB/c mice. Aqueous A. indica leaf extract (AAILE) was administered orally at a dosage of 100 μg/g body mass till the termination of experiment. At the end of experiment, electrical conductivity of hepatic tumors was measured with four-pin electrode method. Tissues and tumors were then processed for TUNEL assay and DNA fragmentation analysis. The levels of TNF-α were also determined in the normal hepatic and tumor tissue. Hepatic tumors had higher electrical conductivity compared to normal liver tissue. An increased necrotic cell percentage along with elevated TNF-α was also observed. Although, AAILE co-treatment resulted in tumors with higher electrical conductivity compared to normal animals. However, the electrical conductivity was decreased significantly compared to untreated tumors. A significant increase in apoptotic cell percentage and concomitant decrease in necrotic cell percentage along with the increased TNF-α level was observed in these tumors. The results suggest that A. indica modulated mode of cell death in tumors and type of cell death had significant contribution in determining hepatic tumor electrical conductivity.