Expression of vascular endothelial growth factor (VEGF-A) in rat mandibular salivary gland during paraneoplastic process and treatment with cyclophosphamide and melatonin.

Expression of VEGF-A in Walker 256 carcinosarcoma and mandibular salivary gland of rats during paraneoplastic process and various regimens of chemotherapy with melatonin and cyclophosphamide were studied by immunohistochemical methods. VEGF-A expression increased in the tumor node and salivary gland after monotherapy with melatonin and cyclophosphamide during progression of tumor growth and paraneoplastic syndrome. A decrease in VEGF-A expression in the tumor node and salivary gland was found after monotherapy with melatonin and cyclophosphamide and, especially, after combined treatment, which proves maximum therapeutic efficiency of combined administration of chemical agents with various mechanisms of action. Overexpression of VEGF-A in the mandibular salivary gland can have diagnostic and predictive value in early diagnostics of neoplasms.

[Ultrastructural changes in endothelial cells of blood capillaries of the Walker 256 carcinosarcoma while treated with melatonin].

In Wistar rats with transplanted Walker 256 carcinosarcoma a use of melatonin as monoagent causes changes in intracellular organization of endothelial cells: reduced volume density of mitochondria, granular cytoplasmic network, micropinocytic vesicles, reduced the number density of free and attached ribosomes, which leads to increased apoptosis of tumor cells of Walker 256 carcinosarcoma.