Articles by Maria-Clemencia Hernandez in JoVE
Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission Frédéric Knoflach1, Maria-Clemencia Hernandez1, Daniel Bertrand2 1Discovery Neuroscience, Pharma Research and Early Development, Roche Innovation Center Basel, 2HiQScreen Sàrl 6 Here, we present protocols to discover compounds active at GABAA receptors, from the binding to the physiology and pharmacology.
Other articles by Maria-Clemencia Hernandez on PubMed
GABAA Receptor-mediated Neurotransmission: Not So Simple After All Biochemical Pharmacology. Sep, 2016 | Pubmed ID: 27002180 GABAA receptors are ligand-gated ion channels that form a fundamental component of inhibitory neurotransmission in the central and peripheral nervous systems. However, since the initial recordings of inhibitory electrical activity of neurons in response to GABA, these receptors have been found to play a more complex role and can, under some circumstances, function in an excitatory manner. This has been demonstrated via electrophysiological recordings conducted in both mature and developing neurons from different brain regions, as well as in various subcellular locations such as dendritic and axonal membranes. The balance between the inhibitory and excitatory effects mediated by GABAA receptor activation depends not only on multiple factors that govern the equilibrium of the transmembrane chloride gradient, but also on bicarbonate concentration. Moreover, electrophysiological and fluorescence measurements have revealed that a spatial distribution of the chloride gradient exists within neurons, which locally influences the effects mediated by GABAA receptor activation. In recent years, it has also become apparent that intra-neuronal chloride concentration is partially regulated by cation-chloride co-transporters (CCCs), in particular NKCC1 and KCC2. The aim of the present commentary is to discuss, in light of the latest findings, potential implications of the tight spatial and temporal regulation of chloride equilibrium in health and disease, as well as its relevance for the therapeutic effects of molecules acting at GABAA receptors.
Pharmacological Interventions to Improve Cognition and Adaptive Functioning in Down Syndrome: Strides to Date American Journal of Medical Genetics. Part A. Nov, 2017 | Pubmed ID: 28884975 Although an increasing number of clinical trials have been developed for cognition in Down syndrome, there has been limited success to date in identifying effective interventions. This review describes the progression from pre-clinical studies with mouse models to human clinical trials research using pharmacological interventions to improve cognition and adaptive functioning in Down syndrome. We also provide considerations for investigators when conducting human clinical trials and describe strategies for the pharmaceutical industry to advance the field in drug discovery for Down syndrome. Future research focusing on earlier pharmaceutical interventions, development of appropriate outcome measures, and greater collaboration between industry, academia, advocacy, and regulatory groups will be important for addressing limitations from prior studies and developing potential effective interventions for cognition in Down syndrome.