3 research outputs found
Cyclodextrin-Adamantane Host–Guest Interactions on the Surface of Biocompatible Adamantyl-Modified Glycodendrimers
A series of adamantyl-modified glycodendrimers
(<b>mPPI-Gx-AdaA-C</b>) was prepared in a two-step synthesis
using two efficient reactions:
(1) urea bond formation from amine and isocyanate and (2) reductive
amination. <sup>1</sup>H NMR spectroscopy (host guest titration and
ROESY experiments) was used to evaluate the graded effect of steric
hindrance as a function of the number and type of oligosaccharide
molecules and of the number of adamantyl (Ada) units on the complexation
with monomeric β-cyclodextrin (β-CD). Glycosylated fourth
generation PPIs showing an average substitution in adamantyl groups
of 13% were found to interact with β-CD effectively, and were
considered as candidates for further complexation studies with a polymeric
cyclodextrin derivative (<i>poly-</i>β-CD). The host–guest
interaction features of the maltosylated dense shell glycodendrimer
along with the low cytotoxicity provided the rational basis for the
use of these adamantyl-functionalized glycodendrimers in the design
of supramolecular systems potentially useful as healthcare materials
Development of Imidazole-Reactive Molecules Leading to a New Aggregation-Induced Emission Fluorophore Based on the Cinnamic Scaffold
In order to obtain new fluorophores
potentially useful in imidazole
labeling and subsequent conjugation, a small series of Morita–Baylis–Hillman
acetates (<b>3a–c</b>) was designed, synthesized, and
reacted with imidazole. The optical properties of the corresponding
imidazole derivatives <b>4a–c</b> were analyzed both
in solution and in the solid state. Although the solutions display
a very weak emission, the powders show a blue emission, particularly
enhanced in the case of compound <b>4c</b> possessing two methoxy
groups in the cinnamic scaffold. The photophysical study confirmed
the hypothesis that the molecular rigidity of the solid state enhances
the emission properties of these compounds by triggering the restriction
of intramolecular motions, paving the way for their applications in
fluorogenic labeling
Novel Dual-Acting Hybrids Targeting Type‑2 Cannabinoid Receptors and Cholinesterase Activity Show Neuroprotective Effects In Vitro and Amelioration of Cognitive Impairment In Vivo
Alzheimer’s disease (AD) is
a neurodegenerative
form of
dementia characterized by the loss of synapses and a progressive decline
in cognitive abilities. Among current treatments for AD, acetylcholinesterase
(AChE) inhibitors have efficacy limited to symptom relief, with significant
side effects and poor compliance. Pharmacological agents that modulate
the activity of type-2 cannabinoid receptors (CB2R) of the endocannabinoid
system by activating or blocking them have also been shown to be effective
against neuroinflammation. Herein, we describe the design, synthesis,
and pharmacological effects in vitro and in vivo of dual-acting compounds
that inhibit AChE and butyrylcholinesterase (BChE) and target CB2R.
Within the investigated series, compound 4g proved to
be the most promising. It achieved IC50 values in the low
micromolar to submicromolar range against both human cholinesterase
isoforms while antagonizing CB2R with Ki of 31 nM. Interestingly, 4g showed neuroprotective
effects on the SH-SY5Y cell line thanks to its ability to prevent
oxidative stress-induced cell toxicity and reverse scopolamine-induced
amnesia in the Y-maze forced alternation test in vivo