[Effects of 4-(4"-(2",2",6",6"-tetramethyl-1"-pipe-ridinyloxy) amino)-4'-demethylepipodophyllotoxin on nucleic acids, proteins, and DNA strand of L7712 cells in vitro].

Abstract

The antitumor activity of GP-7, a new spin-labeled epipodophyllotoxin, was studied by liquid scintillation spectrometry. There were many similarities between GP-7 and etoposide. Both GP-7 and etoposide inhibited the incorporation of [3H]TdR, [3H]UR, and [3H]Leu into DNA, RNA, and protein synthesis in leukemia 7712 cells. The inhibition correlated with drug concentration and duration. IC50 of GP-7 and etoposide on DNA synthesis at 24 h were 0.21 and 0.37 micrograms.ml-1, respectively. The inhibition of GP-7 or etoposide on DNA synthesis retained even after the drug were washed out for 3 h. GP-7 and etoposide caused DNA single-strand breaks, with a well concentration-response relationship. These data suggest that the inhibition of DNA synthesis by GP-7 or etoposide is likely due to the damage of DNA template and breaking of single-strand DNA.

• Authors: X Q He, P Y Zhang, X Tian, J X Li
• Journal: Zhongguo yao li xue bao = Acta pharmacologica Sinica (Zhongguo Yao Li Xue Bao) Vol. 13 Issue 3 Pg. 276-9 (May 1992) ISSN: 0253-9756 [Print] China
• PMID: 1442115 (Publication Type: English Abstract, Journal Article)

Chemical References

• Antineoplastic Agents, Phytogenic
• DNA, Neoplasm
• RNA, Neoplasm
• GP 7
• Etoposide
• Podophyllotoxin

Topics

• Animals
• Antineoplastic Agents, Phytogenic (pharmacology)
• DNA Damage (drug effects)
• DNA, Neoplasm (biosynthesis)
• Etoposide (pharmacology)
• Leukemia, Experimental (pathology)
• Mice
• Podophyllotoxin (analogs & derivatives, pharmacology)
• RNA, Neoplasm (biosynthesis)
• Tumor Cells, Cultured