Lower expression of NCAM-140 in patients with BPD in a current depressive state, but not in a remissive state, compared with controls and patients with MDD.Higher expression of L1 in patients with BPD in a current depressive state, but not in a remissive state, compared with controls and patients with MDD.No significant differences in expression of NCAM-140 or L1 in patients with MDD compared with controls.No significant differences in expression of ICAM-1, VCAM-1 or E-cadherin in patients with MDD or BPD in a current depressive state compared to controls. Here, NCAM1 is linked to major depressive disorder.