| First Author | García-Ayllón MS | Year | 2014 |
| Journal | Neurobiol Aging | Volume | 35 |
| Issue | 7 | Pages | 1526-36 |
| PubMed ID | 24612677 | Mgi Jnum | J:213809 |
| Mgi Id | MGI:5586621 | Doi | 10.1016/j.neurobiolaging.2014.01.147 |
| Citation | Garcia-Ayllon MS, et al. (2014) Presenilin-1 influences processing of the acetylcholinesterase membrane anchor PRiMA. Neurobiol Aging 35(7):1526-36 |
| abstractText | Presenilin-1 (PS1) is the catalytic component of the gamma-secretase complex. In this study, we explore if PS1 participates in the processing of the cholinergic acetylcholinesterase (AChE). The major AChE variant expressed in the brain is a tetramer (G(4)) bound to a proline-rich membrane anchor (PRiMA). Overexpression of the transmembrane PRiMA protein in Chinese hamster ovary cells expressing AChE and treated with the gamma-secretase inhibitor N-[N-(3,5-difluorophenacetyl)-l-alanyl]-S-phenylglycine t-butyl ester have enabled us to study whether, through its gamma-secretase activity, PS1 participates in the processing of PRiMA-linked AChE. gamma-Secretase inhibition led to a notable increase in the level of PRiMA-linked AChE, suggesting that gamma-secretase is involved in the cleavage of PRiMA. We demonstrate that cleavage of PRiMA by gamma-secretase results in a C-terminal PRiMA fragment. Immunofluorescence labeling allowed us to identify this PRiMA fragment in the nucleus. Moreover, we have determined changes in the proportion of the raft-residing AChE-PRiMA in a PS1 conditional knockout mouse. Our results are of interest as both enzymes have therapeutic relevance for Alzheimer's disease. |
