PDZD8-deficient mice accumulate cholesteryl esters in the brain as a result of impaired lipophagy

Keiko Morita, Mariko Wada, Kohta Nakatani, Yuki Matsumoto, Nahoki Hayashi, Ikuko Yamahata, Kotone Mitsunari, Nagi Mukae, Masatomo Takahashi, Yoshihiro Izumi, Takeshi Bamba, Michiko Shirane

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Dyslipidemia including the accumulation of cholesteryl esters (CEs) in the brain is associated with neurological disorders, although the underlying mechanism has been unclear. PDZD8, a Rab7 effector protein, transfers lipids between endoplasmic reticulum (ER) and Rab7-positive organelles and thereby promotes endolysosome maturation and contributes to the maintenance of neuronal integrity. Here we show that CEs accumulate in the brain of PDZD8-deficient mice as a result of impaired lipophagy. This CE accumulation was not affected by diet, implicating a defect in intracellular lipid metabolism. Whereas cholesterol synthesis appeared normal, degradation of lipid droplets (LDs) was defective, in the brain of PDZD8-deficient mice. PDZD8 may mediate the exchange of cholesterol and phosphatidylserine between ER and Rab7-positive organelles to promote the fusion of CE-containing LDs with lysosomes for their degradation. Our results thus suggest that PDZD8 promotes clearance of CEs from the brain by lipophagy, with this role of PDZD8 likely contributing to brain function.

Original languageEnglish
Article number105612
Issue number12
Publication statusPublished - Dec 22 2022

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of 'PDZD8-deficient mice accumulate cholesteryl esters in the brain as a result of impaired lipophagy'. Together they form a unique fingerprint.

Cite this