Characterization of New Proteomic Biomarker Candidates in Mucopolysaccharidosis Type IVA.

Abstract	Mucopolysaccharidosis type IVA (MPS IVA) is a lysosomal storage disease caused by mutations in the N-acetylgalactosamine-6-sulfatase (GALNS) gene. Skeletal dysplasia and the related clinical features of MPS IVA are caused by disruption of the cartilage and its extracellular matrix, leading to a growth imbalance. Enzyme replacement therapy (ERT) with recombinant human GALNS has yielded positive results in activity of daily living and endurance tests. However, no data have demonstrated improvements in bone lesions and bone grow thin MPS IVA after ERT, and there is no correlation between therapeutic efficacy and urine levels of keratan sulfate, which accumulates in MPS IVA patients. Using qualitative and quantitative proteomics approaches, we analyzed leukocyte samples from healthy controls (n = 6) and from untreated (n = 5) and ERT-treated (n = 8, sampled before and after treatment) MPS IVA patients to identify potential biomarkers of disease. Out of 690 proteins identified in leukocytes, we selected a group of proteins that were dysregulated in MPS IVA patients with ERT. From these, we identified four potential protein biomarkers, all of which may influence bone and cartilage metabolism: lactotransferrin, coronin 1A, neutral alpha-glucosidase AB, and vitronectin. Further studies of cartilage and bone alterations in MPS IVA will be required to verify the validity of these proteins as potential biomarkers of MPS IVA.
Authors	Víctor J Álvarez, Susana B Bravo, Maria Pilar Chantada-Vazquez, Cristóbal Colón, María J De Castro, Montserrat Morales, Isidro Vitoria, Shunji Tomatsu, Francisco J Otero-Espinar, María L Couce
Journal	International journal of molecular sciences (Int J Mol Sci) Vol. 22 Issue 1 (Dec 28 2020) ISSN: 1422-0067 [Electronic] Switzerland
PMID	33379360 (Publication Type: Journal Article)
Chemical References	Biomarkers
Topics	Adolescent Adult Biomarkers (metabolism) Case-Control Studies Child Child, Preschool Down-Regulation Enzyme Replacement Therapy Female Humans Infant Leukocytes (metabolism) Male Mucopolysaccharidosis IV (metabolism, therapy) Protein Interaction Maps Proteomics Young Adult

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