title: Lysosomal exocytosis in Schwann cells contributes to axon remyelination.
abstract: Myelin biogenesis is a complex process involving coordinated exocytosis, endocytosis, mRNA transport, and cytoskeletal dynamics. Although abnormalities of myelin are common in lysosomal storage diseases, our understanding of the role of lysosomes in the formation and maintenance of myelin is still limited. Here, we show that late endosomes/lysosomes in Schwann cells contain abundant myelin protein P0, which accounts for over half the total protein of compact myelin in the peripheral nervous system and exhibit Ca(2+) -dependent exocytosis in response to various stimuli. Downregulation of Rab27a, a small GTPase required for the trafficking of the secretory lysosomes to the plasma membrane, largely blocked lysosomal exocytosis in Schwann cells and reduced the remyelination of regenerated sciatic nerve. These findings highlight a novel role for lysosomes in Schwann cells and suggest that the regulated lysosome exocytosis in Schwann cells may have important physiological and pathological significance in the peripheral nervous system.
authors: Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, 226001, Jiangsu, China.
authors: Gang
authors: G
authors: Chen
authors: Zhijun
authors: Z
authors: Zhang
authors: Zhongya
authors: Z
authors: Wei
authors: Qiong
authors: Q
authors: Cheng
authors: Xia
authors: X
authors: Li
authors: Wei
authors: W
authors: Li
authors: Shumin
authors: S
authors: Duan
authors: Xiaosong
authors: X
authors: Gu
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001369:Axons / Q000502:physiology*; D004195:Disease Models, Animal; D005089:Exocytosis / Q000502:physiology*; D008247:Lysosomes / Q000378:metabolism*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D018345:Mice, Knockout; D009413:Nerve Fibers, Myelinated / Q000378:metabolism / Q000502:physiology*; D059348:Peripheral Nerve Injuries / Q000378:metabolism* / Q000473:pathology*; D061251:Primary Cell Culture; D051381:Rats; D017207:Rats, Sprague-Dawley; D012583:Schwann Cells / Q000378:metabolism* / Q000502:physiology