OXTR and Borderline personality disorder: Moreover, a reduction in the expression of the OXT receptor (OXTR) in blood mononuclear cells was observed (Carrasco et al., 2020), while genetic studies reported a possible role of the OXTR gene in the susceptibility to develop BPD symptoms, showing interactions with family functioning (Hammen, Bower, & Cole, 2015) and childhood maltreatment (Flasbeck, Moser, Kumsta, & Brüne, 2018; M. Zhang et al., 2020).