Related Experiment Video
Updated: Dec 14, 2025
Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining
Published on: February 25, 2021
A Possible Role for Arylsulfatase G in Dermatan Sulfate Metabolism
Aleksandra Poterala-Hejmo1, Adam Golda2, Marcin Pacholczyk1
1Department of Systems Biology and Engineering, Silesian University of Technology, 44-100 Gliwice, Poland.
Abstract:
Perturbations of glycosaminoglycan metabolism lead to mucopolysaccharidoses (MPS)-lysosomal storage diseases. One type of MPS (type VI) is associated with a deficiency of arylsulfatase B (ARSB), for which we previously established a cellular model using pulmonary artery endothelial cells with a silenced ARSB gene. Here, we explored the effects of silencing the ARSB gene on the growth of human pulmonary artery smooth muscle cells in the presence of different concentrations of dermatan sulfate (DS). The viability of pulmonary artery smooth muscle cells with a silenced ARSB gene was stimulated by the dermatan sulfate. In contrast, the growth of pulmonary artery endothelial cells was not affected. As shown by microarray analysis, the expression of the arylsulfatase G (ARSG) in pulmonary artery smooth muscle cells increased after silencing the arylsulfatase B gene, but the expression of genes encoding other enzymes involved in the degradation of dermatan sulfate did not. The active site of arylsulfatase G closely resembles that of arylsulfatase B, as shown by molecular modeling. Together, these results lead us to propose that arylsulfatase G can take part in DS degradation; therefore, it can affect the functioning of the cells with a silenced arylsulfatase B gene.
Insights
Silencing the arylsulfatase B gene stimulates pulmonary artery smooth muscle cell growth with dermatan sulfate, suggesting arylsulfatase G compensates for ARSB deficiency in mucopolysaccharidoses.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Mucopolysaccharidoses (MPS) are lysosomal storage diseases caused by defects in glycosaminoglycan metabolism.
- Mucopolysaccharidosis type VI results from arylsulfatase B (ARSB) deficiency.
- A cellular model of ARSB deficiency was previously established using pulmonary artery endothelial cells.
Purpose of the Study:
- To investigate the impact of ARSB gene silencing on human pulmonary artery smooth muscle cell (HPASMC) growth.
- To determine the role of dermatan sulfate (DS) in HPASMCs with silenced ARSB.
- To explore potential compensatory mechanisms for ARSB deficiency.
Main Methods:
- Silencing of the ARSB gene in HPASMCs.
- Cell viability assays with varying concentrations of dermatan sulfate.
- Microarray analysis to assess gene expression changes.
- Molecular modeling to compare active sites of ARSB and arylsulfatase G (ARSG).
Main Results:
- Dermatan sulfate significantly stimulated the viability of ARSB-silenced HPASMCs.
- ARSB gene silencing led to increased expression of arylsulfatase G (ARSG) in HPASMCs.
- No significant effect on pulmonary artery endothelial cell growth was observed.
- Molecular modeling indicated structural similarity between the active sites of ARSB and ARSG.
Conclusions:
- Arylsulfatase G may play a compensatory role in dermatan sulfate degradation when ARSB is deficient.
- ARSG upregulation could influence the cellular response in conditions of ARSB deficiency.
- These findings provide insights into the functional redundancy of enzymes in glycosaminoglycan metabolism.
Related Concept Videos
01:19Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
01:20Sulfur Assimilation
01:23Glycosaminoglycans
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...
01:14Drug Metabolism: Phase II Reactions
01:24Phase II Reactions: Glucuronidation
01:05Proteoglycans