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Correction published on 4 January 2010, see Molecules 2010, 15(1), 149.

Molecules 2010, 15(1), 138-148; doi:10.3390/molecules15010138
Article

The Anti-HIV Actions of 7- and 10-Substituted Camptothecins

1,3,4,5, 2,* , 1, 1, 1 and 1,*
1 Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, China 2 School of Pharmacy, Lanzhou University, Lanzhou 730000, China 3 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 4 The First Affiliated Hospital of Kunming Medical College, Kunming, Yunnan 650032, China 5 Yunnan Institute of Dermatology & Venereology, Kunming, Yunnan 650032, China
* Authors to whom correspondence should be addressed.
Received: 22 November 2009 / Revised: 18 December 2009 / Accepted: 21 December 2009 / Published: 31 December 2009
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Abstract

Camptothecin (CPT), a traditional anti-tumor drug, has been shown to possess anti-HIV-1 activity. To increase the antiviral potency, the anti-HIV activities of two CPT derivatives, 10-hydroxy-CPT and 7-hydroxymethyl-CPT, were evaluated in vitro. The therapy index (TI) of CPT, 10-hydroxy-CPT and 7-hydroxymethyl-CPT against HIV-1IIIB in C8166 were 24.2, 4.2 and 198.1, and against clinical isolated strain HIV-1KM018 in PBMC were 10.3, 3.5 and 66.0, respectively. While the TI of CPT, 10-hydroxy-CPT and 7-hydroxymethyl-CPT against HIV-2CBL-20 were 34.5, 10.7 and 317.0, respectively, and the TI of the three compounds against HIV-2ROD showed the similar values. However, when the antiviral mechanisms were considered, we found there was no inhibition of 7-hydroxymethyl-CPT on viral cell-to-cell transmission, and was no inhibition on reverse transcriptase, protease or integrase in cell-free systems. 7-Hydroxymethyl-CPT showed no selective killing of chronically infected cells after 3 days of incubation. In conclusion, 7-hydroxymethyl-CPT showed more potent anti-HIV activity, while 10-hydroxy-CPT had less efficient activity, compared with the parent CPT. Though the antiviral mechanisms remain to be further elucidated; the modification of -OH residues at C-7 of CPT could enhance the antiviral activity, while of -OH residues at C-10 of CPT had decreased the antiviral activity, which provides the preliminary modification strategy for anti-viral activities enhancement of this compound.
Keywords: camptothecin; anti-HIV agents; HIV camptothecin; anti-HIV agents; HIV
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Li, Y.-Y.; Chen, S.-W.; Yang, L.-M.; Wang, R.-R.; Pang, W.; Zheng, Y.-T. The Anti-HIV Actions of 7- and 10-Substituted Camptothecins. Molecules 2010, 15, 138-148.

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