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Mar. Drugs 2012, 10(10), 2208-2221; doi:10.3390/md10102208

Antioxidant and Anti-Protease Activities of Diazepinomicin from the Sponge-Associated Micromonospora Strain RV115

1,†,* , 2
1 Julius-von-Sachs-Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, Würzburg 97082, Germany 2 Institute of Organic Chemistry, Eberhard-Karls-Universität, Auf der Morgenstelle 18, Tübingen 72076, Germany 3 Department of Toxicology, University of Würzburg, Würzburg 97078, Germany 4 Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, Mainz 55128, Germany Permanent address: Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt. Permanent address: Department of Analytical Chemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt.
* Author to whom correspondence should be addressed.
Received: 24 July 2012 / Revised: 6 September 2012 / Accepted: 17 September 2012 / Published: 8 October 2012
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Diazepinomicin is a dibenzodiazepine alkaloid with an unusual structure among the known microbial metabolites discovered so far. Diazepinomicin was isolated from the marine sponge-associated strain Micromonospora sp. RV115 and was identified by spectroscopic analysis and by comparison to literature data. In addition to its interesting preclinical broad-spectrum antitumor potential, we report here new antioxidant and anti-protease activities for this compound. Using the ferric reducing antioxidant power (FRAP) assay, a strong antioxidant potential of diazepinomicin was demonstrated. Moreover, diazepinomicin showed a significant antioxidant and protective capacity from genomic damage induced by the reactive oxygen species hydrogen peroxide in human kidney (HK-2) and human promyelocytic (HL-60) cell lines. Additionally, diazepinomicin inhibited the proteases rhodesain and cathepsin L at an IC50 of 70–90 µM. It also showed antiparasitic activity against trypomastigote forms of Trypanosoma brucei with an IC50 of 13.5 µM. These results showed unprecedented antioxidant and anti-protease activities of diazepinomicin, thus further highlighting its potential as a future drug candidate.
Keywords: diazepinomicin; anti-protease; antioxidant; actinomycetes; Micromonospora diazepinomicin; anti-protease; antioxidant; actinomycetes; Micromonospora
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Abdelmohsen, U.R.; Szesny, M.; Othman, E.M.; Schirmeister, T.; Grond, S.; Stopper, H.; Hentschel, U. Antioxidant and Anti-Protease Activities of Diazepinomicin from the Sponge-Associated Micromonospora Strain RV115. Mar. Drugs 2012, 10, 2208-2221.

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