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Chondroitin sulfate and keratan sulfate are the major glycosaminoglycans present in the adult zebrafish Danio rerio (Chordata-Cyprinidae)

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Abstract

The zebrafish Danio rerio (Chordata-Cyprinidae) is a model organism frequently used to study the functions of proteoglycans and their glycosaminoglycan (GAG) chains. Although several studies clearly demonstrate the participation of these polymers in different biological and cellular events that take place during embryonic development, little is known about the GAGs in adult zebrafish. In the present study, the total GAGs were extracted from the whole fish by proteolytic digestion, purified by anion-exchange chromatography and characterized by electrophoresis after degradation with specific enzymes and/or by high-performance liquid chromatography (HPLC) analysis of the disaccharides. Two GAGs were identified: a low-molecular-weight chondroitin sulfate (CS) and keratan sulfate (KS), corresponding to ∼80% and 20% of the total GAGs, respectively. In the fish eye, KS represents ∼ 80% of total GAGs. Surprisingly, no heparinoid was detected, but may be present in the fish at concentrations lower than the limit of the method used. HPLC of the disaccharides formed after chondroitin AC or ABC lyase degradation revealed that the zebrafish CS is composed by ΔUA-1→3-GalNAc(4SO4) (59.4%), ΔUA-1→3-GalNAc(6SO4) (23.1%), and ΔUA-1→3-GalNAc (17.5%) disaccharide units. No disulfated disaccharides were detected. Immunolocalization on sections from zebrafish retina using monoclonal antibodies against CS4- or 6-sulfate showed that in the retina these GAGs are restricted to the outer and inner plexiform layers. This is the first report showing the presence of KS in zebrafish eye, and the structural characterization of CS and its localization in the zebrafish retina. Detailed information about the structure and tissue localization of GAGs is important to understand the functions of these polymers in this model organism.

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Abbreviations

α-ΔUA(2SO4):

α-Δ4,5 unsaturated hexuronic acid 2-sulfate

α-ΔUA:

α-Δ4,5 unsaturated hexuronic acid

GalNAc(4SO4):

GalNAc(6SO4) and GalNAc(2,4-diSO4), derivatives of N-acetyl-d-galactosamine, bearing a sulfate ester at position 4, at position 6, and at both positions 2 and 4, respectively

HPLC:

high-performance liquid chromatography

FPLC:

fast protein liquid chromatography

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Acknowledgements

This work was supported by grants from CNPq, FAPERJ and the NIH Fogarty International Center (R03 TW05775). Mauro S.G. Pavão and Manoel L. Costa are research fellows from CNPq.

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Correspondence to Mauro S. G. Pavão.

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The contributions of Aline R.C. Souza and Eliene O. Kozlowski should be considered equal.

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Souza, A.R.C., Kozlowski, E.O., Cerqueira, V.R. et al. Chondroitin sulfate and keratan sulfate are the major glycosaminoglycans present in the adult zebrafish Danio rerio (Chordata-Cyprinidae). Glycoconj J 24, 521–530 (2007). https://doi.org/10.1007/s10719-007-9046-z

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