| First Author | Cao LL | Year | 2019 |
| Journal | Front Aging Neurosci | Volume | 11 |
| Pages | 108 | PubMed ID | 31143112 |
| Mgi Jnum | J:284582 | Mgi Id | MGI:6380791 |
| Doi | 10.3389/fnagi.2019.00108 | Citation | Cao LL, et al. (2019) Calcium Ions Stimulate the Hyperphosphorylation of Tau by Activating Microsomal Prostaglandin E Synthase 1. Front Aging Neurosci 11:108 |
| abstractText | Alzheimer's disease (AD) is reportedly associated with the accumulation of calcium ions (Ca(2+)), and this accumulation is responsible for the phosphorylation of tau. Although several lines of evidence demonstrate the above phenomenon, the inherent mechanisms remain unknown. Using APP/PS1 Tg mice and neuroblastoma (N)2a cells as in vivo and in vitro experimental models, we observed that Ca(2+) stimulated the phosphorylation of tau by activating microsomal PGE synthase 1 (mPGES1) in a prostaglandin (PG) E2-dependent EP receptor-activating manner. Specifically, the highly accumulated Ca(2+) stimulated the expression of mPGES1 and the synthesis of PGE2. Treatment with the inhibitor of Ca(2+) transporter, NMDAR, attenuated the expression of mPGES1 and the production of PGE2 were attenuated in S(+)-ketamine-treated APP/PS1 Tg mice. Elevated levels of PGE2 were responsible for the hyperphosphorylation of tau in an EP-1-, EP-2-, and EP-3-dependent but not EP4-dependent cyclin-dependent kinase (Cdk) 5-activating manner. Reciprocally, the knockdown of the expression of mPGES1 ameliorated the expected cognitive decline by inhibiting the phosphorylation of tau in APP/PS1 Tg mice. Moreover, CDK5 was found to be located downstream of EP1-3 to regulate the phosphorylation of tau though the cleavage of p35 to p25. Finally, the phosphorylation of tau by Ca(2+) contributed to the cognitive decline of APP/PS1 Tg mice. |
