| First Author | Li S | Year | 2015 |
| Journal | Sci Rep | Volume | 5 |
| Pages | 11322 | PubMed ID | 26091071 |
| Mgi Jnum | J:348415 | Mgi Id | MGI:6216988 |
| Doi | 10.1038/srep11322 | Citation | Li S, et al. (2015) Swedish mutant APP-based BACE1 binding site peptide reduces APP beta-cleavage and cerebral Abeta levels in Alzheimer's mice. Sci Rep 5:11322 |
| abstractText | BACE1 initiates amyloid-beta (Abeta) generation and the resultant cerebral amyloidosis, as a characteristic of Alzheimer's disease (AD). Thus, inhibition of BACE1 has been the focus of a large body of research. The most recent clinical trials highlight the difficulty involved in this type of anti-AD therapy as evidenced by side effects likely due to the ubiquitous nature of BACE1, which cleaves multiple substrates. The human Swedish mutant form of amyloid protein precursor (APPswe) has been shown to possess a higher affinity for BACE1 compared to wild-type APP (APPwt). We pursued a new approach wherein harnessing this greater affinity to modulate BACE1 APP processing activity. We found that one peptide derived from APPswe, containing the beta-cleavage site, strongly inhibits BACE1 activity and thereby reduces Abeta production. This peptide, termed APPswe BACE1 binding site peptide (APPsweBBP), was further conjugated to the fusion domain of the HIV-1 Tat protein (TAT) at the C-terminus to facilitate its biomembrane-penetrating activity. APPwt and APPswe over-expressing CHO cells treated with this TAT-conjugated peptide resulted in a marked reduction of Abeta and a significant increase of soluble APPalpha. Intraperitoneal administration of this peptide to 5XFAD mice markedly reduced beta-amyloid deposits as well as improved hippocampal-dependent learning and memory. |
