TY - JOUR T1 - Cerebellar Neurodegeneration and Neuronal Circuit Remodeling in Golgi pH Regulator-Deficient Mice JF - eneuro JO - eNeuro DO - 10.1523/ENEURO.0427-18.2019 VL - 6 IS - 3 SP - ENEURO.0427-18.2019 AU - Yu-shin Sou AU - Soichiro Kakuta AU - Yuji Kamikubo AU - Kazue Niisato AU - Takashi Sakurai AU - Laxmi Kumar Parajuli AU - Isei Tanida AU - Hiromitsu Saito AU - Noboru Suzuki AU - Kenji Sakimura AU - Yusuke Maeda AU - Taroh Kinoshita AU - Yasuo Uchiyama AU - Masato Koike Y1 - 2019/05/01 UR - http://www.eneuro.org/content/6/3/ENEURO.0427-18.2019.abstract N2 - The Golgi apparatus plays an indispensable role in posttranslational modification and transport of proteins to their target destinations. Although it is well established that the Golgi apparatus requires an acidic luminal pH for optimal activity, morphological and functional abnormalities at the neuronal circuit level because of perturbations in Golgi pH are not fully understood. In addition, morphological alteration of the Golgi apparatus is associated with several neurodegenerative diseases, including Parkinson’s disease, Alzheimer’s disease, and amyotrophic lateral sclerosis. Here, we used anatomical and electrophysiological approaches to characterize morphological and functional abnormalities of neuronal circuits in Golgi pH regulator (GPHR) conditional knock-out mice. Purkinje cells (PCs) from the mutant mice exhibited vesiculation and fragmentation of the Golgi apparatus, followed by axonal degeneration and progressive cell loss. Morphological analysis provided evidence for the disruption of basket cell (BC) terminals around PC soma, and electrophysiological recordings showed selective loss of large amplitude responses, suggesting BC terminal disassembly. In addition, the innervation of mutant PCs was altered such that climbing fiber (CF) terminals abnormally synapsed on the somatic spines of mutant PCs in the mature cerebellum. The combined results describe an essential role for luminal acidification of the Golgi apparatus in maintaining proper neuronal morphology and neuronal circuitry. ER -