The present invention relates to an inhibitor of neurocalcin delta (NCALD) for use in a method for the treatment or prevention of a patient suffering from a disorder associated with a pathological calcium homeostasis. Furthermore, the present invention refers to the use of such inhibitor of NCALD for inducing axon proliferation in vitro and to a method for the differentiation and/or maturation of neuronal stem cells (NSCs) in vitro and to the use of such inhibitor of NCALD to restore impaired endocytosis being a consequence of disturbed Ca2+ homeostasis in synaptic terminals essential for development, maturation and maintenance of synapses and neuromuscular junctions (NMJs).
