Micro-RNAs and compositions comprising same for the treatment and diagnosis of serotonin-, adrenalin-, noradrenalin-, glutamate-, and corticotropin-releasing hormone-associated medical conditions

A method of treating a medical condition in which a low adrenaline or noradrenaline level is therapeutically beneficial in a subject in need thereof, the medical condition selected from the group consisting of a stress, an anxiety, and a memory impairment, the method comprising administering to said subject miR-19 or a precursor thereof or expressing in a cell of said subject an exogenous polynucleotide encoding a miR-19 or a precursor thereof, thereby treating the medical condition.