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Fluorescent peptide-PNA chimeras for imaging monoamine oxidase A mRNA in neuronal cells. | LitMetric
Monoamine oxidases (MAO) catalyze the oxidative deamination of many biogenic amines and are integral proteins found in the mitochondrial outer membrane. Changes in MAO-A levels are associated with depression, trait aggression, and addiction. Here we report the synthesis, characterization, and in vitro evaluation of novel fluorescent peptide-peptide nucleic acid (PNA) chimeras for MAOA mRNA imaging in live neuronal cells. The probes were designed to include MAOA-specific PNA dodecamers, separated by an N-terminal spacer to a μ-opioid receptor targeting peptide (DAMGO), with a spacer and a fluorophore on the C-terminus. The probe was successfully delivered into human SH-SY5Y neuroblastoma cells through μ-opioid receptor-mediated endocytosis. The K(d) by flow cytometry was 11.6 ± 0.8 nM. Uptake studies by fluorescence microscopy showed ∼5-fold higher signal in human SH-SY5Y neuroblastoma cells than in negative control CHO-K1 cells that lack μ-opioid receptors. Moreover, a peptide-mismatch control sequence showed no significant uptake in SH-SY5Y cells. Such mRNA imaging agents with near-infrared fluorophores might enable real time imaging and quantitation of neuronal mRNAs in live animal models.
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