[The effect of N-stearoylethanolamine on lipid composition of the metastases and conditionally normal lung tissue in mice with Lewis carcinoma].

Influence of NSE on lipid composition of metastases and the neighbouring conditionally normal lung tissue in mice with Lewis carcinoma was investigated. The processes of peroxidation in investigated tissues were also studied. It was shown that under the influence of NSE the high level of antioxidant activity in the metastases was decreased, while in the neighbouring conditionally normal lung tissue the catalase activity was increased. The content of the thiobarbituric acid-reactive substances in comparison with animals which were not fed by NSE was decreased. The development of carcinoma was accompanied by significant decrease of cholesterol level and by the increase of unsaturated fatty acids esterified in membrane phospholipids in both the metastases and the neighbouring conditionally normal lung tissue. An analysis of the phospholipid spectra shows that under tumor growth in investigated tissues the high-level lysophosphatidylcholine (LPC) was observed. The content of phosphatidyl choline (PC), phosphatidyl ethanolamine (PE), phosphatidyl serine (PS) was found to be significantly lower than in the lung of intact animals. It was found that administration of NSE to tumor-bearing mice contributed to the increase of cholesterol level, to the decrease of omega-6/omega-3 ratio polyunsaturated fatty acids of total phospholipids. NSE modulated the phospholipid membrane composition in both the metastases and the neighbouring conditionally normal lung tissue.