Universität zu Köln

Stamellou, E., Storz, D., Botov, S., Ntasis, E., Wedel, J., Sollazzo, S., Kraemer, B. K., van Son, W., Seelen, M., Schmalz, H. G. ORCID: 0000-0003-0489-1827, Schmidt, A., Hafner, M. and Yard, B. A. (2014). Different design of enzyme-triggered CO-releasing molecules (ET-CORMs) reveals quantitative differences in biological activities in terms of toxicity and inflammation. Redox Biol., 2. S. 739 - 749. AMSTERDAM: ELSEVIER. ISSN 2213-2317

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Abstract

Acyloxydiene-Fe(CO)(3) complexes can act as enzyme-triggered CO-releasing molecules (ET-CORMs). Their biological activity strongly depends on the mother compound from which they are derived, i.e, cyclohexenone or cyclohexanedione, and on the position of the ester functionality they harbour. The present study addresses if the latter characteristic affects CO release, if cytotoxicity of ET-CORMs is mediated through iron release or inhibition of cell respiration and to what extent cyclohexenone and cyclohexanedione derived ET-CORMs differ in their ability to counteract TNF-alpha mediated inflammation. Irrespective of the formulation (DMSO or cyclodextrin), toxicity in HUVEC was significantly higher for ET-CORMs bearing the ester functionality at the outer (rac-4), as compared to the inner (rac-1) position of the cyclohexenone moiety. This was paralleled by an increased CO release from the former ET-CORM. Toxicity was not mediated via iron as EC50 values for rac-4 were significantly lower than for FeCl2 or FeCl3 and were not influenced by iron chelation. ATP depletion preceded toxicity suggesting impaired cell respiration as putative cause for cell death. In long-term HUVEC cultures inhibition of VCAM-1 expression by rac-1 waned in time, while for the cyclohexaneclione derived rac-8 inhibition seems to increase. NF kappa B was inhibited by both rac-1 and rac-8 independent of I kappa B alpha degradation. Both ET-CORMs activated Nrf-2 and consequently induced the expression of HO-1. This study further provides a rational framework for designing acyloxydiene-Fe(CO)(3) complexes as ET-CORMs with differential CO release and biological activities. We also provide a better understanding of how these complexes affect cell-biology in mechanistic terms. (C) 2014 The Authors. Published by Elsevier B.V.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stamellou, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Storz, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Botov, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ntasis, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wedel, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sollazzo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraemer, B. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Son, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Seelen, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmalz, H. G. UNSPECIFIED orcid.org/0000-0003-0489-1827 UNSPECIFIED Schmidt, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hafner, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yard, B. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-452682
DOI:	10.1016/j.redox.2014.06.002
Journal or Publication Title:	Redox Biol.
Volume:	2
Page Range:	S. 739 - 749
Date:	2014
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	2213-2317
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Organic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CARBON-MONOXIDE INHALATION; ENDOTHELIAL-CELLS; HEME; INHIBITION; ACTIVATION; EXPRESSION; COMPLEXES; PROTECT; MICE Multiple languages Biochemistry & Molecular Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/45268