Universität zu Köln

Mattern, A., Machka, F., Wickleder, M. S. ORCID: 0000-0002-8864-4227, Ilyaskina, O. S., Buenemann, M., Diener, M. and Pouokam, E. (2018). Potentiation of the activation of cholinergic receptors by multivalent presentation of ligands supported on gold nanoparticles. Org. Biomol. Chem., 16 (36). S. 6680 - 6688. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1477-0539

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Abstract

Gold nanoparticles (NP) with a functionalized ligand shell offer the possibility to potentiate the action of agonists at the receptor site by multivalency. In order to find out whether this can be realized for the pharmacologically important class of cholinergic receptors known to be involved in the regulation of most organ functions, carbachol-functionalized gold NPs (Au-MUDA-CCh) with an average diameter of 14 nm were synthesized. As functional read-out, cholinergic agonist-induced anion secretion was measured as increase in short-circuit current (I-sc) across rat proximal colon in Ussing chambers. Similarly to the corresponding native agonist acetylcholine, Au-MUDA-CCh induced a concentration-dependent increase in I-sc, which represents chloride secretion across the epithelium. This response was inhibited by atropine and hexamethonium indicating the activation of muscarinic and nicotinic receptors by the functionalized NPs. A strong potentiation of ligand-receptor interaction was a key benefit of functionalized NPs over native agonists. This was observed with physiological approaches as measurements of changes in I-sc revealed a nearly equivalent response evoked by 1 pM Au-MUDA-CCh and 500 nM native CCh. To better determine this potentiation at the receptor level, pharmacological approaches based on the signaling cascade of ACh-induced activation of muscarinic receptors were used. FRET (Forster Resonance Energy Transfer) measurements performed on HEK293T cells transiently transfected with M-3-R, G(q)-YFP, G(1)-wt and CFP-G(2), revealed that both Au-MUDA-CCh and native CCh activated G-proteins with EC50 amounting to 127 +/- 0.44 fM and 224 +/- 7.12 nM, respectively. Thus, the functionalization of the NPs with CCh yields a potentiation by over 10(6), a property that could find usage in specific targeting, activation and compensation of pathologically reduced expression of receptors of interest.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mattern, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Machka, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wickleder, M. S. UNSPECIFIED orcid.org/0000-0002-8864-4227 UNSPECIFIED Ilyaskina, O. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buenemann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Diener, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pouokam, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-172407
DOI:	10.1039/c8ob01686k
Journal or Publication Title:	Org. Biomol. Chem.
Volume:	16
Number:	36
Page Range:	S. 6680 - 6688
Date:	2018
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1477-0539
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CELLS; DYNAMICS Multiple languages Chemistry, Organic Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17240