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Abnormal development of the vertebrae and long bones is a hallmark of skeletal disease in several MPS subtypes; however, the underlying cellular mechanisms remain poorly understood. The objective of this study was to conduct an ultrastructural examination of how lysosomal storage differentially affects major skeletal cell types in MPS I and VII using naturally occurring canine disease models. We showed that both bone and cartilage cells from MPS I and VII dog vertebrae exhibit significantly elevated storage from early in postnatal life, with storage generally greater in MPS VII than MPS I. Storage was most striking for vertebral osteocytes, occupying more than forty percent of cell area. Secondary to storage, dilation of the rough endoplasmic reticulum (ER), a marker of ER stress, was observed most markedly in MPS I epiphyseal chondrocytes. Significantly elevated immunostaining of light chain 3B (LC3B) in MPS VII epiphyseal chondrocytes suggested impaired autophagy, while significantly elevated apoptotic cell death in both MPS I and VII chondrocytes was also evident. The results of this study provide insights into how lysosomal storage differentially effects major skeletal cell types in MPS I and VII, and suggests a potential relationship between storage, ER stress, autophagy, and cell death in the pathogenesis of MPS skeletal defects.<\/jats:p>","DOI":"10.1111\/joa.13305","type":"journal-article","created":{"date-parts":[[2020,9,17]],"date-time":"2020-09-17T07:49:18Z","timestamp":1600328958000},"page":"416-425","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Ultrastructural analysis of different skeletal cell types in mucopolysaccharidosis dogs at the onset of postnatal growth"],"prefix":"10.1111","volume":"238","author":[{"given":"Zhirui","family":"Jiang","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery Perelman School of Medicine University of Pennsylvania Philadelphia PA USA"},{"name":"Department of Neurosurgery Perelman School of Medicine 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