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13.02.2018 | Original Article | Ausgabe 9/2018

European Spine Journal 9/2018

The adolescent idiopathic scoliotic IVD displays advanced aggrecanolysis and a glycosaminoglycan composition similar to that of aged human and ovine IVDs

Zeitschrift:
European Spine Journal > Ausgabe 9/2018
Autoren:
Cindy C. Shu, James Melrose
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00586-018-5515-2) contains supplementary material, which is available to authorized users.

Abstract

Purpose

The present study was designed to ascertain how altered biomechanics in adolescent idiopathic scoliotic (AIS) intervertebral discs (IVDs) affected tissue compositions and aggrecan processing compared to age matched and aged human IVDs. Newborn, 2- and 10-year-old ovine IVDs were also examined.

Methods

Aggrecan populations were separated by Sepharose CL2B chromatography, composite agarose polyacrylamide gel electrophoresis (CAPAGE) and identified by immunoblotting. The KS and CS content of IVD tissue extracts from AIS IVDs were compared with age-matched normal adolescent IVDs and with old human IVDs. Extracts from newborn, 2- and 10-year-old ovine IVDs were also examined in a similar manner.

Results

Adolescent idiopathic scoliotic IVD Aggrecan populations shared similar levels of polydispersity and aggregatability with hyaluronan as old IVD proteoglycans. CAPAGE demonstrated three aggrecan populations in AIS, aged human and ovine IVDs increased polydispersity and mobility in CAPAGE. AIS IVDs had GAG compositions similar to aged human and ovine IVDs. Sulphated KS (5-D-4) and chondroitin-6-sulphate, 3-B-3(+) were markers of tissue maturation, and chondroitin-4-sulphate, 2-B-6(+) was prominent in immature IVDs but its levels were lower in mature IVDs.

Discussion

Sulphated KS and 3-B-3(+) CS were prominently associated with IVD maturation and AIS IVDs, while the 2-B-6(+) CS isomer was associated with immature IVD tissues. The polydispersity of aggrecan in AIS IVDs, which was similar to in old human and ovine IVDs, reflected altered processing in the AIS IVDs in response to the biomechanical microenvironments the disc cells were exposed to in AIS IVDs.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

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Zusatzmaterial
Supplementary material 1 (JPEG 32 kb)
586_2018_5515_MOESM1_ESM.jpg
Supplementary material 2 (JPEG 58 kb)
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Supplementary material 3 (JPEG 59 kb)
586_2018_5515_MOESM3_ESM.jpg
Literatur
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