Bioorganic and Medicinal Chemistry p. 2457 - 2464 (1999)
Update date:2022-08-02
Topics:
Kaczmarek, Lukasz
Peczynska-Czoch, Wanda
Osiadacz, Jaroslaw
Mordarski, Marian
Sokalski, W.Andrzej
Boratynski, Janusz
Marcinkowska, Ewa
Glazman-Kusnierczyk, Halina
Radzikowski, Czeslaw
A series of new 5H-indolo[2,3-b]quinoline derivatives bearing methoxy and methyl groups at C-2 and C-9 was synthesized (according to the modified Graebe-Ullmann reaction). These compounds were evaluated for their antimicrobial and cytotoxic activity and tested as inhibitors of DNA topoisomerase II. Lipophilic and calf thymus DNA binding properties of these compounds were also established. In the SAR studies we used quantum- mechanical methodology to analyze the molecular properties of the drugs. All of the 5H-indolo[2,3-b]quinolines tested were found to inhibit the growth of Gram-positive bacteria and pathogenic fungi at MIC ranging between 2.0 and 6.0 μM. They showed also cytotoxic activity in vitro against several human cancer cell lines of different origin (ID50 varied from 0.6 to 1.4 μM), and stimulated the formation of topoisomerase-II-mediated pSP65 DNA cleavage at concentration between 0.2 and 0.5 μM. The most active indolo[2,3- b]quinolines which had the greatest contribution to the increase in the T(m) of DNA displayed also the highest DNA binding constants and the highest cytotoxic activity. The differences in DNA binding properties and cytotoxic activity seem to be more related to steric than electrostatic effects. (C) 1999 Elsevier Science Ltd.
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