Enzyme replacement therapy in mice lacking arylsulfatase B targets bone-remodeling cells, but not chondrocytes.

Abstract:

:Mucopolysaccharidosis type VI (MPS-VI), caused by mutational inactivation of the glycosaminoglycan-degrading enzyme arylsulfatase B (Arsb), is a lysosomal storage disorder primarily affecting the skeleton. We have previously reported that Arsb-deficient mice display high trabecular bone mass and impaired skeletal growth. In the present study, we treated them by weekly injection of recombinant human ARSB (rhARSB) to analyze the impact of enzyme replacement therapy (ERT) on skeletal growth and bone remodeling. We found that all bone-remodeling abnormalities of Arsb-deficient mice were prevented by ERT, whereas chondrocyte defects were not. Likewise, histologic analysis of the surgically removed femoral head from an ERT-treated MPS-VI patient revealed that only chondrocytes were pathologically affected. Remarkably, a side-by-side comparison with other cell types demonstrated that chondrocytes have substantially reduced capacity to endocytose rhARSB, together with low expression of the mannose receptor. We finally took advantage of Arsb-deficient mice to establish quantification of chondroitin sulfation for treatment monitoring. Our data demonstrate that bone-remodeling cell types are accessible to systemically delivered rhARSB, whereas the uptake into chondrocytes is inefficient.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Hendrickx G,Danyukova T,Baranowsky A,Rolvien T,Angermann A,Schweizer M,Keller J,Schröder J,Meyer-Schwesinger C,Muschol N,Paganini C,Rossi A,Amling M,Pohl S,Schinke T

doi

10.1093/hmg/ddaa006

subject

Has Abstract

pub_date

2020-03-27 00:00:00

pages

803-816

issue

5

eissn

0964-6906

issn

1460-2083

pii

5704975

journal_volume

29

pub_type

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