Study of the interactions between diorganotin (IV) complexes of 1,3-dimethyl-4-acetyl-5-pyrazolone and mononucleotides and DNA / 药学学报

<p><b>AIM</b>The interactions between diorganotin (IV) complexes of 1,3-dimethyl-4-acetyl-5-pyrazolone (HL1) and mono-nucleotides together with DNA near physiological condition were investigated.</p><p><b>METHODS</b>The mode of action of the diorganotin (IV) complexes with mononucleotides and DNA under different conditions and different times were investigated by high resolution NMR technology and UV spectra.</p><p><b>RESULTS</b>The interaction of [(L1)2SnEt2] with AMP was shown to result in significant change of chemical shift of H(8), H(2) and 31P of AMP. Hyperchromic effect of DNA could be observed due to the interaction of; [(L1)2SnEt2] with DNA, while interaction of [(L1)2SnMe2] with AMP and DNA could only cause obvious change of chemical shift of 31P and lead to hypochromic effect of DNA.</p><p><b>CONCLUSION</b>The results indicate that [(L1)2SnEt2] can selectively bind to the N1 atom of the base and the phosphate oxygen atom of AMP and may further destroy the helical structure of DNA, while the dimethyltin (IV) compound of 1,3-dimethyl-4-acetyl-5-pyrazolone [(L1)2SnMe2] merely binds to the the phosphate oxygen atom of AMP and causes the contraction of DNA helical structure.</p>

Influence of high dose progesterone on telomerase activity in patients with carcinoma of endome-trium / 中国癌症杂志

Purpose:To study the influence of treatment with high dose progesterone on telomerase activity in patients with endometrial adenocarcinoma.Methods:20 patients were treated for adenocarcinoma of endometrium with high dose progesterone and the change of telomerase activity in tumor tissue was examined by PCR-TRAP ELISA before and after treatment.Results:The average A value of tumor telomerase before and after treatment were 0.3636(0～1.11) and 0.1134 (0～0.556),respectively.It shows that telomerase activity in tumor was decreased by treatment with progesterone (P