The influence of a new anticarcinogenic compound Cu(II)TOEPyP(4) (Cu(II)-Meso-tetra(4-N-oxyethylpyridyl) porphyrin) (the analogue of TMPy4[tetra(N-mrthyl-4-pyridyl)-porphyrin chloride] - an inhibitor of telomerase activity - on the thermostability of calf thymus DNA in vitro has been studied. It has been shown that Cu(II)TOEPyP(4) is a stronger stabilizing DNA agent, which is expressed with an increase of its thermostability by 20 degrees C. It was determined that complex formation does not disturb the DNA double-helix, and the melting enthalpy (DeltaHm) remains unchanged and it is equal to 11.6+/-1.0 cal/gDNA in the range 0.002
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