BDNF and Huntington disease: Therapeutic benefits from cell transplantations can be derived from both cellular replacement, such as neuronal differentiation and integration, or by the release of trophic factors such as BDNF that can support the survival of neurons in compromised neurodegenerative conditions such as HD (Dey et al., 2010; Serrano Sánchez et al., 2014; Pollock et al., 2016).