Imipramine binds to Amyloid-beta(1-42) monomers in vitro, as shown by NMR spectroscopy.

Imipramine is known as an older generation tricyclic antidepressant drug. It has been identified in prior studies that imipramine blocks Apolipoprotein E4 (ApoE4)-induced amyloid-{beta}(A{beta}) aggregation and is associated with an improved AD diagnosis [Johnson et al. Alzheimers Research Therapy, 2022, 14, 88]. Using NMR methods such as 1H-1H NOESY and Saturation Transfer Difference Spectroscopy, we demonstrate the binding of A{beta} monomers to imipramine when the full-length A{beta} (1-42) sequence is considered. The more abundant but less toxic form, A{beta} (1-40) does not show interaction with imipramine.