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Ma ZW, Mou JY, Yuan Q, Wang ZY, Liu QH, Deng B, Zhang YD, Tang DQ, Wang L. Molecular exploration of the diurnal alteration of glycogen structural fragility and stability in time-restricted-feeding mouse liver. Int J Biol Macromol 2024; 277:134225. [PMID: 39074710 DOI: 10.1016/j.ijbiomac.2024.134225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 07/23/2024] [Accepted: 07/26/2024] [Indexed: 07/31/2024]
Abstract
The structure of glycogen α particles in healthy mouse liver has two states: stability and fragility. In contrast, glycogen α particles in diabetic liver present consistent fragility, which may exacerbate hyperglycemia. Currently, the molecular mechanism behind glycogen structural alteration is still unclear. In this study, we characterized the fine molecular structure of liver glycogen α particles in healthy mice under time-restricted feeding (TRF) mode during a 24-h cycle. Then, differentially expressed genes (DEGs) in the liver during daytime and nighttime were revealed via transcriptomics, which identified that the key downregulated DEGs were mainly related to insulin secretion in daytime. Furthermore, GO annotation and KEGG pathway enrichment found that negative regulation of the glycogen catabolic process and insulin secretion process were significantly downregulated in the daytime. Therefore, transcriptomic analyses indicated that the structural stability of glycogen α particles might be correlated with the glycogen degradation process via insulin secretion downregulation. Further molecular experiments confirmed the significant upregulation of glycogen phosphorylase (PYGL), phosphorylated PYGL (p-PYGL), and glycogen debranching enzyme (AGL) at the protein level during the daytime. Overall, we concluded that the downregulation of insulin secretion in the daytime under TRF mode facilitated glycogenolysis, contributing to the structural stability of glycogen α-particles.
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Affiliation(s)
- Zhang-Wen Ma
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou, China; Laboratory Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong Province, China; State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Taipa, Macau SAR, China
| | - Jing-Yi Mou
- Department of Clinical Medicine, School of The First Clinical Medicine, Xuzhou Medical University, Xuzhou, China; Department of Thyroid and Breast Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, China; Department of Breast Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Quan Yuan
- Department of Intelligent Medical Engineering, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China
| | - Zi-Yi Wang
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Qing-Hua Liu
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Taipa, Macau SAR, China
| | - Bin Deng
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yu-Dong Zhang
- Department of Clinical Medicine, School of The First Clinical Medicine, Xuzhou Medical University, Xuzhou, China.
| | - Dao-Quan Tang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou, China.
| | - Liang Wang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou, China; Laboratory Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong Province, China; School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland, Australia; Centre for Precision Health, School of Medical and Health Sciences, Edith Cowan University, Perth, Western Australia 6027, Australia.
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2
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Liu X, Gilbert RG. Normal and abnormal glycogen structure - A review. Carbohydr Polym 2024; 338:122195. [PMID: 38763710 DOI: 10.1016/j.carbpol.2024.122195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/18/2024] [Accepted: 04/20/2024] [Indexed: 05/21/2024]
Abstract
Glycogen, a complex branched glucose polymer, is found in animals and bacteria, where it serves as an energy storage molecule. It has linear (1 → 4)-α glycosidic bonds between anhydroglucose monomer units, with branch points connected by (1 → 6)-α bonds. Individual glycogen molecules are referred to as β particles. In organs like the liver and heart, these β particles can bind into larger aggregate α particles, which exhibit a rosette-like morphology. The mechanisms and bonding underlying the aggregation process are not fully understood. For example, mammalian liver glycogen has been observed to be molecularly fragile under certain conditions, such as glycogen from diabetic livers fragmenting when exposed to dimethyl sulfoxide (DMSO), while glycogen from healthy livers is much less fragile; this indicates some difference, as yet unknown, in the bonding between β particles in healthy and diabetic glycogen. This fragility may have implications for blood sugar regulation, especially in pathological conditions such as diabetes.
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Affiliation(s)
- Xin Liu
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Zhongshan Biological Breeding Laboratory, and Jiangsu Key Laboratory of Crop Genetics and Physiology, College of Agriculture, Yangzhou University, Yangzhou 225009, China; Centre for Nutrition & Food Sciences, Queensland Alliance for Agriculture & Food Innovations (QAAFI), The University of Queensland, QLD 4072, Australia
| | - Robert G Gilbert
- Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Zhongshan Biological Breeding Laboratory, and Jiangsu Key Laboratory of Crop Genetics and Physiology, College of Agriculture, Yangzhou University, Yangzhou 225009, China; Centre for Nutrition & Food Sciences, Queensland Alliance for Agriculture & Food Innovations (QAAFI), The University of Queensland, QLD 4072, Australia.
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3
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Kim D, Patel S, Duhamel J. Glycogen β-particles surface characterized by a combination of size exclusion chromatography and pyrene excimer fluorescence before and after β-amylolysis. Carbohydr Polym 2024; 338:122090. [PMID: 38763704 DOI: 10.1016/j.carbpol.2024.122090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 03/05/2024] [Accepted: 03/25/2024] [Indexed: 05/21/2024]
Abstract
Size exclusion chromatography (SEC) and pyrene excimer formation (PEF) experiments were conducted to characterize the local density profile inside a glycogen sample before (Glycogen) and after (Gly-β-LD) treatment with β-amylase. These experiments were conducted to assess whether the density at the periphery of the glycogen particles was very high to limit access to proteins involved in the metabolism of glycogen as predicted by the Tier model or low as suggested by the Gilbert model. SEC analysis indicated that the density inside the Glycogen and Gly-β-LD samples remained constant with particle size and was not affected by β-amylolysis. Analysis of the PEF experiments conducted on the Glycogen and Gly-β-LD samples labeled with 1-pyrenebutyric acid showed that the particles have a dense interior and loose corona. The conclusions reached by the SEC and PEF experiments agree with the Gilbert model and have implications for the association of glycogen β-particles into larger α-particles.
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Affiliation(s)
- Damin Kim
- Institute for Polymer Research, Waterloo Institute of Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Sanjay Patel
- Institute for Polymer Research, Waterloo Institute of Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Waterloo Institute of Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
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Kadota K, Uchiyama H, Kämäräinen T, Tanaka S, Tozuka Y. Building respirable powder architectures: utilizing polysaccharides for precise control of particle morphology for enhanced pulmonary drug delivery. Expert Opin Drug Deliv 2024; 21:945-963. [PMID: 38961522 DOI: 10.1080/17425247.2024.2376702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 07/02/2024] [Indexed: 07/05/2024]
Abstract
INTRODUCTION Dry powder inhaler (DPI) formulations are gaining attention as universal formulations with applications in a diverse range of drug formulations. The practical application of DPIs to pulmonary drugs requires enhancing their delivery efficiency to the target sites for various treatment modalities. Previous reviews have not explored the relation between particle morphology and delivery to different pulmonary regions. This review introduces new approaches to improve targeted DPI delivery using novel particle design such as supraparticles and metal-organic frameworks based on cyclodextrin. AREAS COVERED This review focuses on the design of DPI formulations using polysaccharides, promising excipients not yet approved by regulatory agencies. These excipients can be used to design various particle morphologies by controlling their physicochemical properties and manufacturing methods. EXPERT OPINION Challenges associated with DPI formulations include poor access to the lungs and low delivery efficiency to target sites in the lung. The restricted applicability of typical excipients contributes to their limited use. However, new formulations based on polysaccharides are expected to establish a technological foundation for the development of DPIs capable of delivering modalities specific to different lung target sites, thereby enhancing drug delivery.
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Affiliation(s)
- Kazunori Kadota
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
- School of Pharmaceutical Sciences, Wakayama Medical University, Wakayama, Japan
| | - Hiromasa Uchiyama
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
| | - Tero Kämäräinen
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
| | - Shunsuke Tanaka
- Faculty of Environmental and Urban Engineering, Kansai University, Suita, Osaka, Japan
| | - Yuichi Tozuka
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
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Liu JJ, Hou YK, Wang X, He WW, Huang XJ, Yin JY, Nie SP. Dynamics of α-glucan from Agrocybe cylindracea water extract at different developmental stages and its structure characteristics. Int J Biol Macromol 2024; 269:131799. [PMID: 38677677 DOI: 10.1016/j.ijbiomac.2024.131799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 03/17/2024] [Accepted: 03/20/2024] [Indexed: 04/29/2024]
Abstract
Polysaccharides are the important bioactive macromolecules in Agrocybe cylindracea, but their changes are as yet elusive during developmental process. This study investigated the dynamic changes of polysaccharides from A. cylindracea fruiting body water extract at four developmental stages and its structure characteristics. Results revealed that the polysaccharides from A. cylindracea water extract significantly increased at the pileus expansion stage and the increased fraction could be α-glucan. The further purification and identification indicated that this α-glucan was a glycogen. It had typical morphology of β particles with a molecular weight of 1375 kDa. Its backbone comprised α-D-(1 → 4)-Glcp and α-D-(1 → 4,6)-Glcp residues at a ratio of 5:1, terminated by α-D-Glcp residue. Rheological behavior suggested that it was a Newtonian fluid at the concentration of 1 %. In addition, despite both the glycogen and natural starch were composed of D-glucose, they exhibited the entirely distinct Maltese cross characteristic and unique crystalline structure. This study is the first to demonstrate the presence of abundant glycogen in the pileus expansion stage of A. cylindracea, which provides new insights on the change patterns of fungal polysaccharides.
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Affiliation(s)
- Jin-Jin Liu
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China
| | - Yu-Ke Hou
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China
| | - Xin Wang
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China
| | - Wei-Wei He
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China
| | - Xiao-Jun Huang
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China
| | - Jun-Yi Yin
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China.
| | - Shao-Ping Nie
- State Key Laboratory of Food Science and Resources, China-Canada Joint Lab of Food Science and Technology (Nanchang), Nanchang University, Nanchang, Jiangxi Province, 330047, China; Food Laboratory of Zhongyuan, Luo he 462300, Henan, China.
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6
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Loza L, Doering TL. A fungal protein organizes both glycogen and cell wall glucans. Proc Natl Acad Sci U S A 2024; 121:e2319707121. [PMID: 38743622 PMCID: PMC11126952 DOI: 10.1073/pnas.2319707121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/09/2024] [Indexed: 05/16/2024] Open
Abstract
Glycogen is a glucose storage molecule composed of branched α-1,4-glucan chains, best known as an energy reserve that can be broken down to fuel central metabolism. Because fungal cells have a specialized need for glucose in building cell wall glucans, we investigated whether glycogen is used for this process. For these studies, we focused on the pathogenic yeast Cryptococcus neoformans, which causes ~150,000 deaths per year worldwide. We identified two proteins that influence formation of both glycogen and the cell wall: glycogenin (Glg1), which initiates glycogen synthesis, and a protein that we call Glucan organizing enzyme 1 (Goe1). We found that cells missing Glg1 lack α-1,4-glucan in their walls, indicating that this material is derived from glycogen. Without Goe1, glycogen rosettes are mislocalized and β-1,3-glucan in the cell wall is reduced. Altogether, our results provide mechanisms for a close association between glycogen and cell wall.
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Affiliation(s)
- Liza Loza
- Department of Molecular Microbiology, Washington University in St. Louis School of Medicine, St. Louis, MO63110
| | - Tamara L. Doering
- Department of Molecular Microbiology, Washington University in St. Louis School of Medicine, St. Louis, MO63110
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7
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Liu X, Zhang P, Gilbert RG. Formation mechanism of α particles in glycogen: Testing the budding hypothesis by Monte-Carlo simulation. Int J Biol Macromol 2024; 263:130332. [PMID: 38401580 DOI: 10.1016/j.ijbiomac.2024.130332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 02/15/2024] [Accepted: 02/19/2024] [Indexed: 02/26/2024]
Abstract
Glycogen, a complex branched glucose polymer and a blood-sugar reservoir in animals, comprises small β particles joined together into composite α particles. In diabetic animals, α particles fragment more easily than those in healthy animals. Finding evidence for or against postulated mechanisms for α-particle formation is thus important for diabetes research. Insight into this is obtained here using Monte-Carlo simulations, including addition and loss of glucose monomer, branching and debranching, based on earlier simulations which were in acceptable agreement with experiment [Zhang et al., Int J Biol Macromolecules 2018, 116, 264]. One postulated mechanism for α-particle formation is "budding": occasionally a glucan chain temporarily protrudes from the particle, and if its growing end is sufficiently far from its parent particle, it propagates to a new linked particle. We tested this by simulations in which an "artificial" bud (a chain extending well outside the average particle radius) is added to a glycogen molecule in a dynamic steady state, and the system allowed to evolve. In some simulations, the particle reached a new steady state having an irregular dumbbell shape: a rudimentary α particle. Thus 'budding' is a possible mechanism for α particles to form. If no simulations had shown this behaviour, it would have refuted the postulate.
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Affiliation(s)
- Xin Liu
- Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China; Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, Jiangsu Province, China; Centre for Nutrition & Food Sciences, Queensland Alliance for Agriculture & Food Innovations (QAAFI), The University of Queensland, QLD 4072, Australia
| | - Peng Zhang
- School of Electronic Engineering, Tongling University, Tongling 244061, PR China
| | - Robert G Gilbert
- Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China; Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, Jiangsu Province, China; Centre for Nutrition & Food Sciences, Queensland Alliance for Agriculture & Food Innovations (QAAFI), The University of Queensland, QLD 4072, Australia.
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8
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Mou JY, Ma ZW, Zhang MY, Yuan Q, Wang ZY, Liu QH, Li F, Liu Z, Wang L. Structural abnormality of hepatic glycogen in rat liver with diethylnitrosamine-induced carcinogenic injury. Int J Biol Macromol 2024; 260:129432. [PMID: 38228208 DOI: 10.1016/j.ijbiomac.2024.129432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 01/01/2024] [Accepted: 01/09/2024] [Indexed: 01/18/2024]
Abstract
Growing evidence confirms associations between glycogen metabolic re-wiring and the development of liver cancer. Previous studies showed that glycogen structure changes abnormally in liver diseases such as cystic fibrosis, diabetes, etc. However, few studies focus on glycogen molecular structural characteristics during liver cancer development, which is worthy of further exploration. In this study, a rat model with carcinogenic liver injury induced by diethylnitrosamine (DEN) was successfully constructed, and hepatic glycogen structure was characterized. Compared with glycogen structure in the healthy rat liver, glycogen chain length distribution (CLD) shifts towards a short region. In contrast, glycogen particles were mainly present in small-sized β particles in DEN-damaged carcinogenic rat liver. Comparative transcriptomic analysis revealed significant expression changes of genes and pathways involved in carcinogenic liver injury. A combination of transcriptomic analysis, RT-qPCR, and western blot showed that the two genes, Gsy1 encoding glycogen synthase and Gbe1 encoding glycogen branching enzyme, were significantly altered and might be responsible for the structural abnormality of hepatic glycogen in carcinogenic liver injury. Taken together, this study confirmed that carcinogenic liver injury led to structural abnormality of hepatic glycogen, which provided clues to the future development of novel drug targets for potential therapeutics of carcinogenic liver injury.
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Affiliation(s)
- Jing-Yi Mou
- Department of Clinical Medicine, School of 1(st) Clinical Medicine, Xuzhou Medical University, Xuzhou, Jiangsu Province, China
| | - Zhang-Wen Ma
- Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu Province, China
| | - Meng-Ying Zhang
- School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, Jiangsu Province, China
| | - Quan Yuan
- School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, Jiangsu Province, China
| | - Zi-Yi Wang
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Qing-Hua Liu
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Taipa, Macau SAR, China
| | - Fen Li
- Laboratory Medicine, The Fifth People's Hospital of Huai'an, Huai'an, Jiangsu Province, China
| | - Zhao Liu
- Department of Clinical Medicine, School of 1(st) Clinical Medicine, Xuzhou Medical University, Xuzhou, Jiangsu Province, China; Department of Thyroid and Breast Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China.
| | - Liang Wang
- School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, Jiangsu Province, China; Laboratory Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong Province, China; School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland, Australia.
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9
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Chen L, Zhao N, McClements DJ, Hamaker BR, Miao M. Advanced dendritic glucan-derived biomaterials: From molecular structure to versatile applications. Compr Rev Food Sci Food Saf 2023; 22:4107-4146. [PMID: 37350042 DOI: 10.1111/1541-4337.13201] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 05/30/2023] [Accepted: 06/05/2023] [Indexed: 06/24/2023]
Abstract
There is considerable interest in the development of advanced biomaterials with improved or novel functionality for diversified applications. Dendritic glucans, such as phytoglycogen and glycogen, are abundant biomaterials with highly branched three-dimensional globular architectures, which endow them with unique structural and functional attributes, including small size, large specific surface area, high water solubility, low viscosity, high water retention, and the availability of numerous modifiable surface groups. Dendritic glucans can be synthesized by in vivo biocatalysis reactions using glucosyl-1-phosphate as a substrate, which can be obtained from plant, animal, or microbial sources. They can also be synthesized by in vitro methods using sucrose or starch as a substrate, which may be more suitable for large-scale industrial production. The large numbers of hydroxyl groups on the surfaces of dendritic glucan provide a platform for diverse derivatizations, including nonreducing end, hydroxyl functionalization, molecular degradation, and conjugation modifications. Due to their unique physicochemical and functional attributes, dendritic glucans have been widely applied in the food, pharmaceutical, biomedical, cosmetic, and chemical industries. For instance, they have been used as delivery systems, adsorbents, tissue engineering scaffolds, biosensors, and bioelectronic components. This article reviews progress in the design, synthesis, and application of dendritic glucans over the past several decades.
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Affiliation(s)
- Long Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Ningjing Zhao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - David J McClements
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Bruce R Hamaker
- Whistler Center for Carbohydrate Research, Purdue University, West Lafayette, Indiana, USA
| | - Ming Miao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
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10
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Pan B, Zhao N, Xie Q, Li Y, Hamaker BR, Miao M. Molecular structure and characteristics of phytoglycogen, glycogen and amylopectin subjected to mild acid hydrolysis. NPJ Sci Food 2023; 7:27. [PMID: 37291152 DOI: 10.1038/s41538-023-00201-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 05/22/2023] [Indexed: 06/10/2023] Open
Abstract
The structure and properties of phytoglycogen and glycogen subjected to acid hydrolysis was investigated using amylopectin as a reference. The degradation took place in two stages and the degree of hydrolysis was in the following order: amylopectin > phytoglycogen > glycogen. Upon acid hydrolysis, the molar mass distribution of phytoglycogen or glycogen gradually shifted to the smaller and broadening distribution region, whereas the distribution of amyopectin changed from bimodal to monomodal shape. The kinetic rate constant for depolymerization of phytoglycogen, amylopectin, and glycogen were 3.45 × 10-5/s, 6.13 × 10-5/s, and 0.96 × 10-5/s, respectively. The acid-treated sample had the smaller particle radius, lower percentage of α-1,6 linkage as well as higher rapidly digestible starch fractions. The depolymerization models were built to interpret the structural differences of glucose polymer during acid treatment, which would provide guideline to improve the structure understanding and precise application of branched glucan with desired properties.
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Affiliation(s)
- Bo Pan
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China
| | - Ningjing Zhao
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China
| | - Qiuqi Xie
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China
| | - Yungao Li
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China
| | - Bruce R Hamaker
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China
- Whistler Center for Carbohydrate Research and Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN, 47907-2009, USA
| | - Ming Miao
- State Key Laboratory of Food Science & Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, P. R. China.
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Glycogen-Endoplasmic Reticulum Connection in the Liver. Int J Mol Sci 2023; 24:ijms24021074. [PMID: 36674588 PMCID: PMC9862463 DOI: 10.3390/ijms24021074] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/04/2022] [Accepted: 12/27/2022] [Indexed: 01/08/2023] Open
Abstract
Glycogen, the branched polymer of glucose is found mainly in the liver and muscle in mammals. Along with several other proteins, glycogen forms separate cellular organelles, and particles in cells. Glycogen particles in the liver have a special metabolic and also regulatory connection to the intracellular endomembrane system, particularly the endoplasmic reticulum. This connection is part of the organelle homeostasis in hepatocytes and forms a "glycogenoreticular system". The actual size of hepatic glycogen stores and the rate of glycogenolysis determines several essential liver-specific metabolic processes, such as glucose secretion for the maintenance of blood glucose levels or the glucuronidation of certain vital endo-, and xenobiotics, and are also related to liver antioxidant defense. In starvation, and in certain physiological and pathological states, where glycogen stores are depleted, functions of the glycogenoreticular system are altered. The starvation-induced depletion of hepatic glycogen content changes the biotransformation of various endo- and xenobiotics. This can be observed especially in acute DILI (drug-induced liver injury) due to paracetamol overdose, which is the most common cause of acute liver failure in the West.
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12
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Interior of glycogen probed by pyrene excimer fluorescence. Carbohydr Polym 2023; 299:120205. [PMID: 36876816 DOI: 10.1016/j.carbpol.2022.120205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 10/06/2022] [Indexed: 11/09/2022]
Abstract
A glycogen sample from oyster (O) and another from corn (C) were fluorescently labeled with 1-pyrenebutyric acid to yield two series of pyrene-labeled glycogen samples (Py-Glycogen(O/C)). Analysis of the time-resolved fluorescence (TRF) measurements of the Py-Glycogen(O/C) dispersions in dimethyl sulfoxide yielded the maximum number (<Nblobexp>) of anhydroglucose units (AGUs), that could separate two pyrene-labeled AGUs and still allow efficient pyrene excimer formation (PEF) between an excited and a ground-state pyrene. Molecular mechanics optimizations (MMOs) were conducted on a lattice of hexagonally close packed oligosaccharide helices to determine how the theoretical Nblobtheo varied as a function of the lattice density. Comparing <Nblobexp> and <Nblobtheo>, obtained after integrating Nblobtheo along the local density profile ρ(r) across the glycogen particles, led to the conclusion that ρ(r) took a maximum value at the center of the glycogen particles contrary to expectations based on the Tier Model.
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13
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Hu Y, Li C, Hou Y. Possible regulation of liver glycogen structure through the gut-liver axis by resistant starch: a review. Food Funct 2021; 12:11154-11164. [PMID: 34694313 DOI: 10.1039/d1fo02416g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Liver glycogen α particles in diabetic patients are fragile relative to those in healthy individuals, and restoring these fragile glycogen particles to a normal state shows potential to contribute to the remission of diabetes. Resistant starch (RS) is beneficial for diabetes management through its interactions with the gut microbiota. However, its effects on glycogen fragility are not fully understood. This review aims to summarize the recent understanding of the interactions between RS and the human gut microbiota and the possible connections to liver glycogen biosynthesis to elucidate its role in the development of glycogen fragility. RS might regulate glycogen fragility in diabetes by modulating the postprandial glycemic response and glycogen biosynthesis pathways. Before RS can be applied to repair fragile glycogen, more work should be done to better understand in vivo RS structures and identify the factor binding glycogen β particles together. This review contains important information on the connections between glycogen fragility and RS-gut microbiota interactions, which could help to better understand the health benefits of RS consumption.
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Affiliation(s)
- Yiming Hu
- Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai 200031, China.
| | - Cheng Li
- School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Yingyong Hou
- Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai 200031, China.
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14
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Wali JA, Milner AJ, Luk AWS, Pulpitel TJ, Dodgson T, Facey HJW, Wahl D, Kebede MA, Senior AM, Sullivan MA, Brandon AE, Yau B, Lockwood GP, Koay YC, Ribeiro R, Solon-Biet SM, Bell-Anderson KS, O'Sullivan JF, Macia L, Forbes JM, Cooney GJ, Cogger VC, Holmes A, Raubenheimer D, Le Couteur DG, Simpson SJ. Impact of dietary carbohydrate type and protein-carbohydrate interaction on metabolic health. Nat Metab 2021; 3:810-828. [PMID: 34099926 DOI: 10.1038/s42255-021-00393-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 04/19/2021] [Indexed: 02/07/2023]
Abstract
Reduced protein intake, through dilution with carbohydrate, extends lifespan and improves mid-life metabolic health in animal models. However, with transition to industrialised food systems, reduced dietary protein is associated with poor health outcomes in humans. Here we systematically interrogate the impact of carbohydrate quality in diets with varying carbohydrate and protein content. Studying 700 male mice on 33 isocaloric diets, we find that the type of carbohydrate and its digestibility profoundly shape the behavioural and physiological responses to protein dilution, modulate nutrient processing in the liver and alter the gut microbiota. Low (10%)-protein, high (70%)-carbohydrate diets promote the healthiest metabolic outcomes when carbohydrate comprises resistant starch (RS), yet the worst outcomes were with a 50:50 mixture of monosaccharides fructose and glucose. Our findings could explain the disparity between healthy, high-carbohydrate diets and the obesogenic impact of protein dilution by glucose-fructose mixtures associated with highly processed diets.
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Affiliation(s)
- Jibran A Wali
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia.
- The University of Sydney, ANZAC Research Institute, Sydney, New South Wales, Australia.
| | - Annabelle J Milner
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Alison W S Luk
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Tamara J Pulpitel
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Tim Dodgson
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Harrison J W Facey
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Devin Wahl
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- The University of Sydney, ANZAC Research Institute, Sydney, New South Wales, Australia
| | - Melkam A Kebede
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Alistair M Senior
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Mitchell A Sullivan
- Mater Research Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Amanda E Brandon
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Belinda Yau
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Glen P Lockwood
- The University of Sydney, ANZAC Research Institute, Sydney, New South Wales, Australia
| | - Yen Chin Koay
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Rosilene Ribeiro
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Samantha M Solon-Biet
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Kim S Bell-Anderson
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - John F O'Sullivan
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Laurence Macia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Josephine M Forbes
- Mater Research Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Gregory J Cooney
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Victoria C Cogger
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- The University of Sydney, ANZAC Research Institute, Sydney, New South Wales, Australia
| | - Andrew Holmes
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - David Raubenheimer
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - David G Le Couteur
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- The University of Sydney, ANZAC Research Institute, Sydney, New South Wales, Australia
| | - Stephen J Simpson
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia.
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15
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Liu QH, Tang JW, Wen PB, Wang MM, Zhang X, Wang L. From Prokaryotes to Eukaryotes: Insights Into the Molecular Structure of Glycogen Particles. Front Mol Biosci 2021; 8:673315. [PMID: 33996916 PMCID: PMC8116748 DOI: 10.3389/fmolb.2021.673315] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/07/2021] [Indexed: 12/25/2022] Open
Abstract
Glycogen is a highly-branched polysaccharide that is widely distributed across the three life domains. It has versatile functions in physiological activities such as energy reserve, osmotic regulation, blood glucose homeostasis, and pH maintenance. Recent research also confirms that glycogen plays important roles in longevity and cognition. Intrinsically, glycogen function is determined by its structure that has been intensively studied for many years. The recent association of glycogen α-particle fragility with diabetic conditions further strengthens the importance of glycogen structure in its function. By using improved glycogen extraction procedures and a series of advanced analytical techniques, the fine molecular structure of glycogen particles in human beings and several model organisms such as Escherichia coli, Caenorhabditis elegans, Mus musculus, and Rat rattus have been characterized. However, there are still many unknowns about the assembly mechanisms of glycogen particles, the dynamic changes of glycogen structures, and the composition of glycogen associated proteins (glycogen proteome). In this review, we explored the recent progresses in glycogen studies with a focus on the structure of glycogen particles, which may not only provide insights into glycogen functions, but also facilitate the discovery of novel drug targets for the treatment of diabetes mellitus.
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Affiliation(s)
- Qing-Hua Liu
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau, China.,Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, China
| | - Jia-Wei Tang
- Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China
| | - Peng-Bo Wen
- Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China
| | - Meng-Meng Wang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou, China
| | - Xiao Zhang
- Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China
| | - Liang Wang
- Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou, China.,Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou, China
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16
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Optimization of liver glycogen extraction when considering the fine molecular structure. Carbohydr Polym 2021; 261:117887. [PMID: 33766374 DOI: 10.1016/j.carbpol.2021.117887] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/17/2021] [Accepted: 02/28/2021] [Indexed: 12/16/2022]
Abstract
Liver glycogen is a branched glucose polymer that functions as a blood-sugar buffer in animals. Previous studies have shown that glycogen's molecular structure affects its properties. This makes it important to develop a technique that extracts and purifies a representative sample of glycogen. Here we aim to optimize the sucrose density gradient centrifugation method for preserving glycogen's molecular structure by varying the density of the sucrose solution. The preservation of glycogen's structure involves: 1) minimizing molecular damage and 2) obtaining a structurally representative sample of glycogen. The addition of a 10-minute boiling step was also tested as a means for denaturing any glycogen degrading enzymes. Lower sucrose concentrations and the introduction of the boiling step were shown to be beneficial in obtaining a more structurally representative sample, with the preservation of smaller glycogen particles and decreased glycogen chain degradation.
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17
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Nawaz A, Zhang P, Li E, Gilbert RG, Sullivan MA. The importance of glycogen molecular structure for blood glucose control. iScience 2021; 24:101953. [PMID: 33458612 PMCID: PMC7797522 DOI: 10.1016/j.isci.2020.101953] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Type 2 diabetes incidence continues to increase rapidly. This disease is characterized by a breakdown in blood glucose homeostasis. The impairment of glycemic control is linked to the structure of glycogen, a highly branched glucose polymer. Liver glycogen, a major controller of blood sugar, comprises small β particles which can link together to form larger α particles. These degrade to glucose more slowly than β particles, enabling a controlled release of blood glucose. The α particles in diabetic mice are however easily broken down into β particles, which degrade more quickly. Because this may lead to higher blood glucose, understanding this diabetes-associated breakdown of α-particle molecular structure may help in the development of diabetes therapeutics. We review the extraction of liver glycogen, its molecular structure, and how this structure is affected by diabetes and then use this knowledge to make postulates to guide the development of strategies to help mitigate type 2 diabetes.
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Affiliation(s)
- Asad Nawaz
- Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, P.R. China
- Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
| | - Peng Zhang
- School of Electronic Information Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Enpeng Li
- Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, P.R. China
- Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
| | - Robert G. Gilbert
- Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, College of Agriculture, Yangzhou University, Yangzhou 225009, P.R. China
- Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane 4072, QLD, Australia
| | - Mitchell A. Sullivan
- Glycation and Diabetes, Mater Research Institute – The University of Queensland, Translational Research Institute, Brisbane, QLD 4102, Australia
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18
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Chabi M, Leleu M, Fermont L, Colpaert M, Colleoni C, Ball SG, Cenci U. Retracing Storage Polysaccharide Evolution in Stramenopila. FRONTIERS IN PLANT SCIENCE 2021; 12:629045. [PMID: 33747010 PMCID: PMC7965971 DOI: 10.3389/fpls.2021.629045] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/18/2021] [Indexed: 05/10/2023]
Abstract
Eukaryotes most often synthesize storage polysaccharides in the cytosol or vacuoles in the form of either alpha (glycogen/starch)- or beta-glucosidic (chrysolaminarins and paramylon) linked glucan polymers. In both cases, the glucose can be packed either in water-soluble (glycogen and chrysolaminarins) or solid crystalline (starch and paramylon) forms with different impacts, respectively, on the osmotic pressure, the glucose accessibility, and the amounts stored. Glycogen or starch accumulation appears universal in all free-living unikonts (metazoa, fungi, amoebozoa, etc.), as well as Archaeplastida and alveolata, while other lineages offer a more complex picture featuring both alpha- and beta-glucan accumulators. We now infer the distribution of these polymers in stramenopiles through the bioinformatic detection of their suspected metabolic pathways. Detailed phylogenetic analysis of key enzymes of these pathways correlated to the phylogeny of Stramenopila enables us to retrace the evolution of storage polysaccharide metabolism in this diverse group of organisms. The possible ancestral nature of glycogen metabolism in eukaryotes and the underlying source of its replacement by beta-glucans are discussed.
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Affiliation(s)
- Malika Chabi
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Marie Leleu
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- InBioS-PhytoSYSTEMS, Eukaryotic Phylogenomics, University of Liège, Liège, Belgium
| | - Léa Fermont
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Matthieu Colpaert
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Christophe Colleoni
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Steven G. Ball
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Ugo Cenci
- Univ. Lille, CNRS, UMR 8576—UGSF—Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- *Correspondence: Ugo Cenci,
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19
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Besford QA, Weiss ACG, Schubert J, Ryan TM, Maitz MF, Tomanin PP, Savioli M, Werner C, Fery A, Caruso F, Cavalieri F. Protein Component of Oyster Glycogen Nanoparticles: An Anchor Point for Functionalization. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38976-38988. [PMID: 32805918 DOI: 10.1021/acsami.0c10699] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Biosourced nanoparticles have a range of desirable properties for therapeutic applications, including biodegradability and low immunogenicity. Glycogen, a natural polysaccharide nanoparticle, has garnered much interest as a component of advanced therapeutic materials. However, functionalizing glycogen for use as a therapeutic material typically involves synthetic approaches that can negatively affect the intrinsic physiological properties of glycogen. Herein, the protein component of glycogen is examined as an anchor point for the photopolymerization of functional poly(N-isopropylacrylamide) (PNIPAM) polymers. Oyster glycogen (OG) nanoparticles partially degrade to smaller spherical particles in the presence of protease enzymes, reflecting a population of surface-bound proteins on the polysaccharide. The grafting of PNIPAM to the native protein component of OG produces OG-PNIPAM nanoparticles of ∼45 nm in diameter and 6.2 MDa in molecular weight. PNIPAM endows the nanoparticles with temperature-responsive aggregation properties that are controllable and reversible and that can be removed by the biodegradation of the protein. The OG-PNIPAM nanoparticles retain the native biodegradability of glycogen. Whole blood incubation assays revealed that the OG-PNIPAM nanoparticles have a low cell association and inflammatory response similar to that of OG. The reported strategy provides functionalized glycogen nanomaterials that retain their inherent biodegradability and low immune cell association.
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Affiliation(s)
- Quinn A Besford
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Alessia C G Weiss
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Jonas Schubert
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Timothy M Ryan
- The Australian Synchrotron, Clayton, Victoria 3168, Australia
| | - Manfred F Maitz
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Pietro Pacchin Tomanin
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Marco Savioli
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Carsten Werner
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Andreas Fery
- Leibniz Institute for Polymer Research, Hohe Straße 6, 01069 Dresden, Germany
| | - Frank Caruso
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Francesca Cavalieri
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Via Della Ricerca Scientifica 1, 00133 Rome, Italy
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20
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Starch and Glycogen Analyses: Methods and Techniques. Biomolecules 2020; 10:biom10071020. [PMID: 32660096 PMCID: PMC7407607 DOI: 10.3390/biom10071020] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/06/2020] [Accepted: 07/07/2020] [Indexed: 01/16/2023] Open
Abstract
For complex carbohydrates, such as glycogen and starch, various analytical methods and techniques exist allowing the detailed characterization of these storage carbohydrates. In this article, we give a brief overview of the most frequently used methods, techniques, and results. Furthermore, we give insights in the isolation, purification, and fragmentation of both starch and glycogen. An overview of the different structural levels of the glucans is given and the corresponding analytical techniques are discussed. Moreover, future perspectives of the analytical needs and the challenges of the currently developing scientific questions are included.
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21
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Besford QA, Cavalieri F, Caruso F. Glycogen as a Building Block for Advanced Biological Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1904625. [PMID: 31617264 DOI: 10.1002/adma.201904625] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/15/2019] [Indexed: 06/10/2023]
Abstract
Biological nanoparticles found in living systems possess distinct molecular architectures and diverse functions. Glycogen is a unique biological polysaccharide nanoparticle fabricated by nature through a bottom-up approach. The biocatalytic synthesis of glycogen has evolved over time to form a nanometer-sized dendrimer-like structure (20-150 nm) with a highly branched surface and a dense core. This makes glycogen markedly different from other natural linear or branched polysaccharides and particularly attractive as a platform for biomedical applications. Glycogen is inherently biodegradable, nontoxic, and can be functionalized with diverse surface and internal motifs for enhanced biofunctional properties. Recently, there has been growing interest in glycogen as a natural alternative to synthetic polymers and nanoparticles in a range of applications. Herein, the recent literature on glycogen in the material-based sciences, including its use as a constituent in biodegradable hydrogels and fibers, drug delivery vectors, tumor targeting and penetrating nanoparticles, immunomodulators, vaccine adjuvants, and contrast agents, is reviewed. The various methods of chemical functionalization and physical assembly of glycogen nanoparticles into multicomponent nanodevices, which advance glycogen toward a functional therapeutic nanoparticle from nature and back again, are discussed in detail.
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Affiliation(s)
- Quinn A Besford
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Francesca Cavalieri
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria, 3010, Australia
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Frank Caruso
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria, 3010, Australia
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22
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Khan T, He Y, Kryza T, Harrington BS, Gunter JH, Sullivan MA, Cuda T, Rogers R, Davies CM, Broomfield A, Gough M, Wu AC, McGann T, Weroha SJ, Haluska P, Forbes JM, Armes JE, Barry SC, Coward JI, Jagasia N, Chetty N, Snell CE, Lourie R, Perrin LC, Hooper JD. Disruption of Glycogen Utilization Markedly Improves the Efficacy of Carboplatin against Preclinical Models of Clear Cell Ovarian Carcinoma. Cancers (Basel) 2020; 12:E869. [PMID: 32260077 PMCID: PMC7226162 DOI: 10.3390/cancers12040869] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/30/2020] [Accepted: 04/01/2020] [Indexed: 12/19/2022] Open
Abstract
High stage and recurrent ovarian clear cell carcinoma (OCC) are associated with poor prognosis and resistance to chemotherapy. A distinguishing histological feature of OCC is abundant cytoplasmic stores of glucose, in the form of glycogen, that can be mobilized for cellular metabolism. Here, we report the effect on preclinical models of OCC of disrupting glycogen utilization using the glucose analogue 2-deoxy-D-glucose (2DG). At concentrations significantly lower than previously reported for other cancers, 2DG markedly improves the efficacy in vitro of carboplatin chemotherapy against chemo-sensitive TOV21G and chemo-resistant OVTOKO OCC cell lines, and this is accompanied by the depletion of glycogen. Of note, 2DG doses-of more than 10-fold lower than previously reported for other cancers-significantly improve the efficacy of carboplatin against cell line and patient-derived xenograft models in mice that mimic the chemo-responsiveness of OCC. These findings are encouraging, in that 2DG doses, which are substantially lower than previously reported to cause adverse events in cancer patients, can safely and significantly improve the efficacy of carboplatin against OCC. Our results thus justify clinical trials to evaluate whether low dose 2DG improves the efficacy of carboplatin in OCC patients.
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Affiliation(s)
- Tashbib Khan
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Yaowu He
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Thomas Kryza
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Brittney S. Harrington
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Jennifer H. Gunter
- Australian Prostate Cancer Research Centre-Queensland, Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Translational Research Institute, Brisbane, QLD 4102, Australia;
| | - Mitchell A. Sullivan
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Tahleesa Cuda
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Rebecca Rogers
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Claire M. Davies
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Amy Broomfield
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Madeline Gough
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Andy C. Wu
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Thomas McGann
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - S. John Weroha
- Department of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (S.J.W.); (P.H.)
| | - Paul Haluska
- Department of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (S.J.W.); (P.H.)
- Bristol-Myers Squibb, Princeton, NJ 08540, USA
| | - Josephine M. Forbes
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
| | - Jane E. Armes
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Sinead C. Barry
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Jermaine I. Coward
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- ICON Cancer Care, South Brisbane, QLD 4101, Australia
| | - Nisha Jagasia
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Naven Chetty
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Cameron E. Snell
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Rohan Lourie
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - Lewis C. Perrin
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
- Mater Brisbane Hospital, Mater Health Services, South Brisbane, QLD 4101, Australia; (A.B.); (M.G.); (N.J.); (N.C.)
| | - John D. Hooper
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; (T.K.); (Y.H.); (T.K.); (B.S.H.); (M.A.S.); (T.C.); (R.R.); (C.M.D.); (A.C.W.); (T.M.); (J.M.F.); (J.E.A.); (S.C.B.); (J.I.C.); (C.E.S.); (R.L.); (L.C.P.)
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23
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Wang L, Liu Q, Wang M, Du Y, Tan X, Xu B, Cheung U, Li E, Gilbert RG, Tang D. Effects of fasting on liver glycogen structure in rats with type 2 diabetes. Carbohydr Polym 2020; 237:116144. [PMID: 32241436 DOI: 10.1016/j.carbpol.2020.116144] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/08/2020] [Accepted: 03/07/2020] [Indexed: 12/25/2022]
Abstract
Liver glycogen, a highly branched glucose polymer, is important for blood sugar homeostasis. It comprises α particles which are made of linked β particles; the molecular structure changes diurnally. In diabetic liver, the α particles are fragile, easily breaking apart into β particles in chaotropic agents such as dimethyl sulfoxide. We here use size-exclusion chromatography to study how fasting changes liver-glycogen structure in vivo for mice in which type-2 diabetes had previously been induced. Diabetic glycogen degraded enzymatically more quickly in the fasted animals than did glycogen without fasting, with fewer α particles, which however were still fragile. The glycogen had fewer long chains and more shorter chains after fasting. This study gives an overview of the in vivo dynamic changes in α-particles under starvation conditions in both normal and diabetic livers.
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Affiliation(s)
- Liang Wang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Bioinformatics, School of Medical Informatics and Engineering, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
| | - Qinghua Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
| | - Mengmeng Wang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
| | - Yan Du
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
| | - Xinle Tan
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Bingju Xu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
| | - Ut Cheung
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Enpeng Li
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China
| | - Robert G Gilbert
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia; Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China.
| | - Daoquan Tang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China; Department of Pharmaceutical Analysis, School of Pharmacy, Xuzhou Medical University, Xuzhou 221000, Jiangsu Province, China
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24
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Li C, Hu Z. Is liver glycogen fragility a possible drug target for diabetes? FASEB J 2019; 34:3-15. [PMID: 31914592 DOI: 10.1096/fj.201901463rr] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 10/08/2019] [Accepted: 10/09/2019] [Indexed: 12/14/2022]
Abstract
Liver glycogen α particles are molecularly fragile in diabetic mice, and readily form smaller β particles, which degrade more rapidly to glucose. This effect is well associated with the loss of blood-glucose homeostasis in diabetes. The biological mechanism of such fragility is still unknown; therefore, there are perceived opportunities that could eventually lead to new means to manage type 2 diabetes. The hierarchical structures of glycogen particles are controlled by the underlying biosynthesis/degradation process that involves various enzymes, including, for example, glycogen synthase (GS) and glycogen-branching enzyme (GBE). Recent studies have shown that fragile glycogen α particles in diabetic mice have longer chains and a higher molecular density compared to wild-type mice, indicating an enhanced enzymatic activity ratio of GS to GBE in diabetes. Furthermore, it has been shown that with an improved blood glucose homeostasis, the glycogen fragility in diabetic mice can be restored by treatment with active ingredients from traditional Chinese medicine, yet the underlying mechanism is unknown. In this review, we summarize recent advances in understandings glycogen fragility from the perspectives of glycogen biosynthesis/degradation, glycogen hierarchical structures, and its relation to diabetes. Importantly, we for the first time set GS/GBE activity ratio as the therapeutic target for diabetes.
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Affiliation(s)
- Cheng Li
- Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan, China.,School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, China
| | - Zhenxia Hu
- Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan, China
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25
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Sullivan MA, Forbes JM. Glucose and glycogen in the diabetic kidney: Heroes or villains? EBioMedicine 2019; 47:590-597. [PMID: 31405756 PMCID: PMC6796499 DOI: 10.1016/j.ebiom.2019.07.067] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/17/2019] [Accepted: 07/29/2019] [Indexed: 12/19/2022] Open
Abstract
Glucose metabolism in the kidney is currently foremost in the minds of nephrologists, diabetologists and researchers globally, as a result of the outstanding success of SGLT2 inhibitors in reducing renal and cardiovascular disease in individuals with diabetes. However, these exciting data have come with the puzzling but fascinating paradigm that many of the beneficial effects on the kidney and cardiovascular system seem to be independent of the systemic glucose lowering actions of these agents. This manuscript places into context an area of research highly relevant to renal glucose metabolism, that of glycogen accumulation and metabolism in the diabetic kidney. Whether the glycogen that abnormally accumulates is pathological (the villain), is somehow protective (the hero) or is inconsequential (the bystander) is a research question that may provide insight into the link between diabetes and diabetic kidney disease.
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Affiliation(s)
- Mitchell A Sullivan
- Glycation and Diabetes Group, Mater Research Institute-The University of Queensland, Translational Research Institute, Woolloongabba, Queensland, Australia.
| | - Josephine M Forbes
- Glycation and Diabetes Group, Mater Research Institute-The University of Queensland, Translational Research Institute, Woolloongabba, Queensland, Australia; Mater Clinical School, School of Medicine, The University of Queensland, St Lucia, Queensland, Australia.
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26
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Effects of active ingredients from traditional Chinese medicines on glycogen molecular structure in diabetic mice. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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27
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Brewer MK, Gentry MS. Brain Glycogen Structure and Its Associated Proteins: Past, Present and Future. ADVANCES IN NEUROBIOLOGY 2019; 23:17-81. [PMID: 31667805 PMCID: PMC7239500 DOI: 10.1007/978-3-030-27480-1_2] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This chapter reviews the history of glycogen-related research and discusses in detail the structure, regulation, chemical properties and subcellular distribution of glycogen and its associated proteins, with particular focus on these aspects in brain tissue.
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Affiliation(s)
- M Kathryn Brewer
- Department of Molecular and Cellular Biochemistry, Epilepsy and Brain Metabolism Center, Lafora Epilepsy Cure Initiative, and Center for Structural Biology, University of Kentucky College of Medicine, Lexington, KY, USA
| | - Matthew S Gentry
- Department of Molecular and Cellular Biochemistry, Epilepsy and Brain Metabolism Center, Lafora Epilepsy Cure Initiative, and Center for Structural Biology, University of Kentucky College of Medicine, Lexington, KY, USA.
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28
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Tan X, Sullivan MA, Nada SS, Deng B, Schulz BL, Gilbert RG. Proteomic Investigation of the Binding Agent between Liver Glycogen β Particles. ACS OMEGA 2018; 3:3640-3645. [PMID: 30023874 PMCID: PMC6045358 DOI: 10.1021/acsomega.8b00119] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 03/22/2018] [Indexed: 06/08/2023]
Abstract
Glycogen is a highly branched glucose polymer which plays an important role in glucose storage and the maintenance of blood sugar homeostasis. The dimeric protein glycogenin can self-glucosylate to act as a primer for glycogen synthesis, eventually resulting in small (∼20 nm diameter) glycogen β particles with a dimer of glycogenin at their core. In the liver, glycogen is also found in the form of α particles: large bound composites of many β particles. Here, we provide evidence using qualitative and quantitative proteomics and size-exclusion chromatography from healthy rat, mouse, and human liver glycogen that glycogenin is the binding agent linking β particles together into α particles.
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Affiliation(s)
- Xinle Tan
- Joint
International Research Laboratory of Agriculture and Agri-Product
Safety, College of Agriculture, Yangzhou
University, Yangzhou 225009, Jiangsu Province, China
- School of Chemistry and Molecular
Biosciences and Centre for Nutrition and Food Sciences,
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
- Tongji
School of Pharmacy and Department of Pharmacy, Union Hospital, Tongji Medical
College, Huazhong University of Science
and Technology, Wuhan, Hubei 430030, China
| | - Mitchell A. Sullivan
- Glycation
and Diabetes, Mater Research Institute, Translational Research Institute, The University of Queensland, Brisbane, Queensland 4102, Australia
| | - Sharif S. Nada
- School of Chemistry and Molecular
Biosciences and Centre for Nutrition and Food Sciences,
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Bin Deng
- Tongji
School of Pharmacy and Department of Pharmacy, Union Hospital, Tongji Medical
College, Huazhong University of Science
and Technology, Wuhan, Hubei 430030, China
| | - Benjamin L. Schulz
- School of Chemistry and Molecular
Biosciences and Centre for Nutrition and Food Sciences,
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Robert G. Gilbert
- Joint
International Research Laboratory of Agriculture and Agri-Product
Safety, College of Agriculture, Yangzhou
University, Yangzhou 225009, Jiangsu Province, China
- School of Chemistry and Molecular
Biosciences and Centre for Nutrition and Food Sciences,
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
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29
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Abstract
Glycogen, the primary storage form of glucose, is a rapid and accessible form of energy that can be supplied to tissues on demand. Each glycogen granule, or "glycosome," is considered an independent metabolic unit composed of a highly branched polysaccharide and various proteins involved in its metabolism. In this Minireview, we review the literature to follow the dynamic life of a glycogen granule in a multicompartmentalized system, i.e. the cell, and how and where glycogen granules appear and the factors governing its degradation. A better understanding of the importance of cellular compartmentalization as a regulator of glycogen metabolism is needed to unravel its role in brain energetics.
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Affiliation(s)
- Clara Prats
- Center for Healthy Aging, Copenhagen 2200, Denmark; Core Facility for Integrated Microscopy, Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark.
| | - Terry E Graham
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Jane Shearer
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Calgary, Alberta T2N 1N4, Canada; Faculty of Kinesiology, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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30
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Hu Z, Deng B, Tan X, Gan H, Li C, Nada SS, Sullivan MA, Li J, Jiang X, Li E, Gilbert RG. Diurnal changes of glycogen molecular structure in healthy and diabetic mice. Carbohydr Polym 2018; 185:145-152. [PMID: 29421051 DOI: 10.1016/j.carbpol.2018.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 12/20/2017] [Accepted: 01/01/2018] [Indexed: 12/28/2022]
Abstract
Glycogen is a complex branched glucose polymer functioning as a blood-sugar reservoir in animals. Liver glycogen β particles can bind together to form α particles, which have a slower enzymatic degradation to glucose. The linkage between β particles in α particles in diabetic liver breaks (is fragile) in dimethyl sulfoxide (DMSO), a H-bond disruptor, consistent with blood-sugar homeostasis loss in diabetes. We examined diurnal changes in the molecular structure of healthy and diabetic mouse-liver glycogen. Healthy mouse glycogen was fragile to DMSO during glycogen synthesis but not degradation; diabetic glycogen was always fragile. Two alternative mechanisms for this are suggested: healthy glycogen is fragile when formed and becomes stable during subsequent degradation, a process damaged in diabetes; alternatively, there are two types of glycogen: one compact but fragile and the other loose but non-fragile. This suggests potential types of diabetes drug targets through modifying the activities of glycogen synthesis enzymes.
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Affiliation(s)
- Zhenxia Hu
- Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan, Hubei 430030, China
| | - Bin Deng
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.
| | - Xinle Tan
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072, Australia
| | - Hua Gan
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Cheng Li
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China
| | - Sharif S Nada
- The University of Queensland, Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Mitchell A Sullivan
- Glycation and Diabetes, Mater Research Institute, Translational Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Jialun Li
- Department of Plastic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Xiaoyin Jiang
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Enpeng Li
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China
| | - Robert G Gilbert
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, China; School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
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31
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Zhuang A, Yap FY, Bruce C, Leung C, Plan MR, Sullivan MA, Herath C, McCarthy D, Sourris KC, Kantharidis P, Coughlan MT, Febbraio MA, Hodson MP, Watt MJ, Angus P, Schulz BL, Forbes JM. Increased liver AGEs induce hepatic injury mediated through an OST48 pathway. Sci Rep 2017; 7:12292. [PMID: 28947796 PMCID: PMC5612946 DOI: 10.1038/s41598-017-12548-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/11/2017] [Indexed: 12/13/2022] Open
Abstract
The protein oligosaccharyltransferase-48 (OST48) is integral to protein N-glycosylation in the endoplasmic reticulum (ER) but is also postulated to act as a membrane localised clearance receptor for advanced glycation end-products (AGE). Hepatic ER stress and AGE accumulation are each implicated in liver injury. Hence the objective of this study was to increase the expression of OST48 and examine the effects on hepatic function and structure. Groups of 8 week old male mice (n = 10-12/group) over-expressing the gene for OST48, dolichyl-diphosphooligosaccharide-protein glycosyltransferase (DDOST+/-), were followed for 24 weeks, while randomised to diets either low or high in AGE content. By week 24 of the study, either increasing OST48 expression or consumption of high AGE diet impaired liver function and modestly increased hepatic fibrosis, but their combination significantly exacerbated liver injury in the absence of steatosis. DDOST+/- mice had increased both portal delivery and accumulation of hepatic AGEs leading to central adiposity, insulin secretory defects, shifted fuel usage to fatty and ketoacids, as well as hepatic glycogen accumulation causing hepatomegaly along with hepatic ER and oxidative stress. This study revealed a novel role of the OST48 and AGE axis in hepatic injury through ER stress, changes in fuel utilisation and glucose intolerance.
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Affiliation(s)
- Aowen Zhuang
- Glycation and Diabetes, Mater Research Institute - The University of Queensland, Translational Research Institute, Woolloongabba, Australia
- School of Medicine, University of Queensland, St Lucia, Australia
| | - Felicia Yt Yap
- Diabetic Complications Group, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
- Department of Immunology and Medicine, Central and Eastern Clinical School, AMREP Precinct, Monash University, Clayton, Australia
| | - Clinton Bruce
- Institute for Physical Activity and Nutrition (IPAN), Deakin University, Burwood, Australia
| | - Chris Leung
- Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Australia
| | - Manuel R Plan
- Metabolomics Australia, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, Australia
| | - Mitchell A Sullivan
- Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, University of Queensland, St Lucia, Australia
| | - Chandana Herath
- Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Australia
| | - Domenica McCarthy
- Glycation and Diabetes, Mater Research Institute - The University of Queensland, Translational Research Institute, Woolloongabba, Australia
| | - Karly C Sourris
- Diabetic Complications Group, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
- Department of Immunology and Medicine, Central and Eastern Clinical School, AMREP Precinct, Monash University, Clayton, Australia
| | - Phillip Kantharidis
- Diabetic Complications Group, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Melinda T Coughlan
- Diabetic Complications Group, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
- Department of Immunology and Medicine, Central and Eastern Clinical School, AMREP Precinct, Monash University, Clayton, Australia
| | - Mark A Febbraio
- Diabetic Complications Group, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Mark P Hodson
- Metabolomics Australia, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, Australia
- School of Pharmacy, University of Queensland, Woolloongabba, Australia
| | - Matthew J Watt
- Biomedicine Discovery Program and the Department of Physiology, Monash University, Clayton, Australia
| | - Peter Angus
- Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Australia
| | - Benjamin L Schulz
- School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Australia
| | - Josephine M Forbes
- Glycation and Diabetes, Mater Research Institute - The University of Queensland, Translational Research Institute, Woolloongabba, Australia.
- Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Australia.
- Mater Clinical School, University of Queensland, St Lucia, Australia.
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Boyer L, Roussel X, Courseaux A, Ndjindji OM, Lancelon-Pin C, Putaux JL, Tetlow IJ, Emes MJ, Pontoire B, D' Hulst C, Wattebled F. Expression of Escherichia coli glycogen branching enzyme in an Arabidopsis mutant devoid of endogenous starch branching enzymes induces the synthesis of starch-like polyglucans. PLANT, CELL & ENVIRONMENT 2016; 39:1432-1447. [PMID: 26715025 DOI: 10.1111/pce.12702] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 12/08/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
Starch synthesis requires several enzymatic activities including branching enzymes (BEs) responsible for the formation of α(1 → 6) linkages. Distribution and number of these linkages are further controlled by debranching enzymes that cleave some of them, rendering the polyglucan water-insoluble and semi-crystalline. Although the activity of BEs and debranching enzymes is mandatory to sustain normal starch synthesis, the relative importance of each in the establishment of the plant storage polyglucan (i.e. water insolubility, crystallinity and presence of amylose) is still debated. Here, we have substituted the activity of BEs in Arabidopsis with that of the Escherichia coli glycogen BE (GlgB). The latter is the BE counterpart in the metabolism of glycogen, a highly branched water-soluble and amorphous storage polyglucan. GlgB was expressed in the be2 be3 double mutant of Arabidopsis, which is devoid of BE activity and consequently free of starch. The synthesis of a water-insoluble, partly crystalline, amylose-containing starch-like polyglucan was restored in GlgB-expressing plants, suggesting that BEs' origin only has a limited impact on establishing essential characteristics of starch. Moreover, the balance between branching and debranching is crucial for the synthesis of starch, as an excess of branching activity results in the formation of highly branched, water-soluble, poorly crystalline polyglucan.
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Affiliation(s)
- Laura Boyer
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France
| | - Xavier Roussel
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France
| | - Adeline Courseaux
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France
| | - Ofilia M Ndjindji
- Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000, Grenoble, France
- CNRS, CERMAV, F-38000, Grenoble, France
| | - Christine Lancelon-Pin
- Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000, Grenoble, France
- CNRS, CERMAV, F-38000, Grenoble, France
| | - Jean-Luc Putaux
- Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000, Grenoble, France
- CNRS, CERMAV, F-38000, Grenoble, France
| | - Ian J Tetlow
- Department of Molecular and Cellular Biology, Science Complex, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Michael J Emes
- Department of Molecular and Cellular Biology, Science Complex, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | | | - Christophe D' Hulst
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France
| | - Fabrice Wattebled
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000, Lille, France
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Tan X, Sullivan MA, Gao F, Li S, Schulz BL, Gilbert RG. A new non-degradative method to purify glycogen. Carbohydr Polym 2016; 147:165-170. [PMID: 27178921 DOI: 10.1016/j.carbpol.2016.04.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 03/31/2016] [Accepted: 04/02/2016] [Indexed: 12/22/2022]
Abstract
Liver glycogen, a complex branched glucose polymer containing a small amount of protein, is important for maintaining glucose homeostasis (blood-sugar control) in humans. It has recently been found that glycogen molecular structure is impaired in diabetes. Isolating the carbohydrate polymer and any intrinsically-attached protein(s) is an essential prerequisite for studying this structural impairment. This requires an effective, non-degradative and efficient purification method to exclude the many other proteins present in liver. Proteins and glycogen have different ranges of molecular sizes. Despite the plethora of proteins that might still be present in significant abundance after other isolation techniques, SEC (size exclusion chromatography, also known as GPC), which separates by molecular size, should separate those extraneous to glycogen from glycogen with any intrinsically associated protein(s). A novel purification method is developed for this, based on preparative SEC following sucrose gradient centrifugation. Proteomics is used to show that the new method compares favourably with current methods in the literature.
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Affiliation(s)
- Xinle Tan
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Mitchell A Sullivan
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia; Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Fei Gao
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Shihan Li
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia; Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Benjamin L Schulz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Robert G Gilbert
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia; Joint International Research Laboratory of Agriculture and Agri-Product Safety, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu Province, PR China.
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Deng B, Sullivan MA, Chen C, Li J, Powell PO, Hu Z, Gilbert RG. Molecular Structure of Human-Liver Glycogen. PLoS One 2016; 11:e0150540. [PMID: 26934359 PMCID: PMC4775040 DOI: 10.1371/journal.pone.0150540] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 02/15/2016] [Indexed: 01/08/2023] Open
Abstract
Glycogen is a highly branched glucose polymer which is involved in maintaining blood-sugar homeostasis. Liver glycogen contains large composite α particles made up of linked β particles. Previous studies have shown that the binding which links β particles into α particles is impaired in diabetic mice. The present study reports the first molecular structural characterization of human-liver glycogen from non-diabetic patients, using transmission electron microscopy for morphology and size-exclusion chromatography for the molecular size distribution; the latter is also studied as a function of time during acid hydrolysis in vitro, which is sensitive to certain structural features, particularly glycosidic vs. proteinaceous linkages. The results are compared with those seen in mice and pigs. The molecular structural change during acid hydrolysis is similar in each case, and indicates that the linkage of β into α particles is not glycosidic. This result, and the similar morphology in each case, together imply that human liver glycogen has similar molecular structure to those of mice and pigs. This knowledge will be useful for future diabetes drug targets.
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Affiliation(s)
- Bin Deng
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Mitchell A. Sullivan
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
- Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, 4072, Australia
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, ON, M5G 1X8, Canada
| | - Cheng Chen
- Department of Endocrinology, Wuhan General Hospital of Guangzhou Military Command, Wuluo Road 627, Wuhan, Hubei, 430070, China
| | - Jialun Li
- Department of Plastic Surgery, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Prudence O. Powell
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
- Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Zhenxia Hu
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Robert G. Gilbert
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
- Centre for Nutrition and Food Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, 4072, Australia
- * E-mail:
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Liver glycogen in type 2 diabetic mice is randomly branched as enlarged aggregates with blunted glucose release. Glycoconj J 2015; 33:41-51. [PMID: 26521055 DOI: 10.1007/s10719-015-9631-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 10/15/2015] [Accepted: 10/16/2015] [Indexed: 12/28/2022]
Abstract
Glycogen is a vital highly branched polymer of glucose that is essential for blood glucose homeostasis. In this article, the structure of liver glycogen from mice is investigated with respect to size distributions, degradation kinetics, and branching structure, complemented by a comparison of normal and diabetic liver glycogen. This is done to screen for differences that may result from disease. Glycogen α-particle (diameter ∼ 150 nm) and β-particle (diameter ∼ 25 nm) size distributions are reported, along with in vitro γ-amylase degradation experiments, and a small angle X-ray scattering analysis of mouse β-particles. Type 2 diabetic liver glycogen upon extraction was found to be present as large loosely bound, aggregates, not present in normal livers. Liver glycogen was found to aggregate in vitro over a period of 20 h, and particle size is shown to be related to rate of glucose release, allowing a structure-function relationship to be inferred for the tissue specific distribution of particle types. Application of branching theories to small angle X-ray scattering data for mouse β-particles revealed these particles to be randomly branched polymers, not fractal polymers. Together, this article shows that type 2 diabetic liver glycogen is present as large aggregates in mice, which may contribute to the inflexibility of interconversion between glucose and glycogen in type 2 diabetes, and further that glycogen particles are randomly branched with a size that is related to the rate of glucose release.
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Powell PO, Sullivan MA, Sheehy JJ, Schulz BL, Warren FJ, Gilbert RG. Acid hydrolysis and molecular density of phytoglycogen and liver glycogen helps understand the bonding in glycogen α (composite) particles. PLoS One 2015; 10:e0121337. [PMID: 25799321 PMCID: PMC4370380 DOI: 10.1371/journal.pone.0121337] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 02/10/2015] [Indexed: 11/21/2022] Open
Abstract
Phytoglycogen (from certain mutant plants) and animal glycogen are highly branched glucose polymers with similarities in structural features and molecular size range. Both appear to form composite α particles from smaller β particles. The molecular size distribution of liver glycogen is bimodal, with distinct α and β components, while that of phytoglycogen is monomodal. This study aims to enhance our understanding of the nature of the link between liver-glycogen β particles resulting in the formation of large α particles. It examines the time evolution of the size distribution of these molecules during acid hydrolysis, and the size dependence of the molecular density of both glucans. The monomodal distribution of phytoglycogen decreases uniformly in time with hydrolysis, while with glycogen, the large particles degrade significantly more quickly. The size dependence of the molecular density shows qualitatively different shapes for these two types of molecules. The data, combined with a quantitative model for the evolution of the distribution during degradation, suggest that the bonding between β into α particles is different between phytoglycogen and liver glycogen, with the formation of a glycosidic linkage for phytoglycogen and a covalent or strong non-covalent linkage, most probably involving a protein, for glycogen as most likely. This finding is of importance for diabetes, where α-particle structure is impaired.
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Affiliation(s)
- Prudence O. Powell
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Mitchell A. Sullivan
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Joshua J. Sheehy
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Benjamin L. Schulz
- School of Chemistry and Molecular Biosciences, Faculty of Science, The University of Queensland, Brisbane, QLD, Australia
| | - Frederick J. Warren
- Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Robert G. Gilbert
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
- * E-mail:
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38
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Molecular structure of glycogen in diabetic liver. Glycoconj J 2015; 32:113-8. [PMID: 25796617 DOI: 10.1007/s10719-015-9578-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 02/23/2015] [Accepted: 02/26/2015] [Indexed: 01/30/2023]
Abstract
Liver glycogen (involved in maintaining blood-sugar levels) is a hyperbranched glucose polymer containing β particles (diameter ~20 nm), which can form composite α particles (diameter ~50-300 nm), and includes a small but significant amount of bound protein. Size distributions of glycogen from livers of healthy and diabetic mice were examined using size-exclusion chromatography with two separate eluents: aqueous eluent and dimethylsulfoxide (DMSO) eluent. Morphologies were examined with transmission electron microscopy. Diabetic glycogen (DG) exhibited many α particles in the mild water-based solvent, but in DMSO, which breaks H bonds, these degraded to β particles; α particles however were always present in healthy glycogen (HG). This DG fragility shows the binding of β into α particles is different in HG and DG. The diabetic α particle fragility may be involved with the uncontrolled blood-sugar release symptomatic of diabetes: small β particles degrade more easily to glucose than α particles. This has implications for diabetes management.
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39
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Sullivan MA, Li S, Aroney STN, Deng B, Li C, Roura E, Schulz BL, Harcourt BE, Forbes JM, Gilbert RG. A rapid extraction method for glycogen from formalin-fixed liver. Carbohydr Polym 2014; 118:9-15. [PMID: 25542100 DOI: 10.1016/j.carbpol.2014.11.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 10/17/2014] [Accepted: 11/09/2014] [Indexed: 10/24/2022]
Abstract
Liver glycogen, a highly branched polymer, acts as our blood-glucose buffer. While past structural studies have extracted glycogen from fresh or frozen tissue using a cold-water, sucrose-gradient centrifugation technique, a method for the extraction of glycogen from formalin-fixed liver would allow the analysis of glycogen from human tissues that are routinely collected in pathology laboratories. In this study, both sucrose-gradient and formalin-fixed extraction techniques were carried out on piglet livers, with the yields, purities and size distributions (using size exclusion chromatography) compared. The formalin extraction technique, when combined with a protease treatment, resulted in higher yields (but lower purities) of glycogen with size distributions similar to the sucrose-gradient centrifugation technique. This formalin extraction procedure was also significantly faster, allowing glycogen extraction throughput to increase by an order of magnitude. Both extraction techniques were compatible with mass spectrometry proteomics, with analysis showing the two techniques were highly complementary.
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Affiliation(s)
- Mitchell A Sullivan
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
| | - Shihan Li
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
| | - Samuel T N Aroney
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
| | - Bin Deng
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.
| | - Cheng Li
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
| | - Eugeni Roura
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
| | - Benjamin L Schulz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Brooke E Harcourt
- Glycation and Diabetes Complications, Mater Research-UQ, Translational Research Institute, Woolloongabba, QLD 4102, Australia.
| | - Josephine M Forbes
- Glycation and Diabetes Complications, Mater Research-UQ, Translational Research Institute, Woolloongabba, QLD 4102, Australia; Mater Clinical School, University of Queensland, Brisbane, QLD 4072, Australia.
| | - Robert G Gilbert
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia.
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Sullivan MA, Powell PO, Witt T, Vilaplana F, Roura E, Gilbert RG. Improving size-exclusion chromatography separation for glycogen. J Chromatogr A 2014; 1332:21-9. [PMID: 24508396 DOI: 10.1016/j.chroma.2014.01.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 12/23/2013] [Accepted: 01/20/2014] [Indexed: 10/25/2022]
Abstract
Glycogen is a hyperbranched glucose polymer comprised of glycogen β particles, which can also form much larger composite α particles. The recent discovery using size-exclusion chromatography (SEC) that fewer, smaller, α particles are found in diabetic-mouse liver compared to healthy mice highlights the need to achieve greater accuracy in the size separation methods used to analyze α and β particles. While past studies have used dimethyl sulfoxide as the SEC eluent to analyze the molecular size and structure of native glycogen, an aqueous eluent has not been rigorously tested and compared with dimethyl sulfoxide. The conditions for SEC of pig-liver glycogen, phytoglycogen and oyster glycogen were optimized by comparing two different eluents, aqueous 50 mM NH₄NO₃/0.02% NaN₃ and dimethyl sulfoxide/0.5% LiBr, run through different column materials and pore sizes at various flow rates. The aqueous system gave distinct size separation of α- and β-particle peaks, allowing for a more detailed and quantitative analysis and comparison between liver glycogen samples. This greater resolution has also revealed key differences between the structure of liver glycogen and phytoglycogen.
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Affiliation(s)
- Mitchell A Sullivan
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia
| | - Prudence O Powell
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia
| | - Torsten Witt
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia
| | - Francisco Vilaplana
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia; Division of Glycoscience, School of Biotechnology and Wallenberg Wood Science Centre (WWSC), KTH Royal Institute of Technology, AlbaNova University Centre, SE-106 91 Stockholm, Sweden
| | - Eugeni Roura
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia
| | - Robert G Gilbert
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, Queensland 4072, Australia.
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Sullivan MA, Aroney STN, Li S, Warren FJ, Joo JS, Mak KS, Stapleton DI, Bell-Anderson KS, Gilbert RG. Changes in glycogen structure over feeding cycle sheds new light on blood-glucose control. Biomacromolecules 2014; 15:660-5. [PMID: 24372590 DOI: 10.1021/bm401714v] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Liver glycogen, a highly branched polymer of glucose, is important for maintaining blood-glucose homeostasis. It was recently shown that db/db mice, a model for Type 2 diabetes, are unable to form the large composite glycogen α particles present in normal, healthy mice. In this study, the structure of healthy mouse-liver glycogen over the diurnal cycle was characterized using size exclusion chromatography and transmission electron microscopy. Glycogen was found to be formed as smaller β particles, and then only assembled into large α particles, with a broad size distribution, significantly after the time when glycogen content had reached a maximum. This pathway, missing in diabetic animals, is likely to give optimal blood-glucose control during the daily feeding cycle. Lack of this control may contribute to, or result from, diabetes. This discovery suggests novel approaches to diabetes management.
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Affiliation(s)
- Mitchell A Sullivan
- Tongji School of Pharmacy, Huazhong University of Science and Technology , Wuhan, Hubei 430030, China
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42
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Gilbert RG, Sullivan MA. The Molecular Size Distribution of Glycogen and its Relevance to Diabetes. Aust J Chem 2014. [DOI: 10.1071/ch13573] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Glycogen is a highly branched polymer of glucose, functioning as a blood-glucose buffer. It comprises relatively small β-particles, which may be joined as larger aggregate α-particles. The size distributions from size-exclusion chromatography (SEC, also known as GPC) of liver glycogen from non-diabetic and diabetic mice show that diabetic mice have impaired α-particle formation, shedding new light on diabetes. SEC data also suggest the type of bonding holding β-particles together in α-particles. SEC characterisation of liver glycogen at various time points in a day/night cycle indicates that liver glycogen is initially synthesised as β-particles, and then joined by an unknown process to form α-particles. These α-particles are more resistant to degradation, presumably because of their lower surface area-to-volume ratio. These findings have important implications for new drug targets for diabetes management.
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Powell PO, Sullivan MA, Sweedman MC, Stapleton DI, Hasjim J, Gilbert RG. Extraction, isolation and characterisation of phytoglycogen from su-1 maize leaves and grain. Carbohydr Polym 2014; 101:423-31. [DOI: 10.1016/j.carbpol.2013.09.061] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 08/13/2013] [Accepted: 09/18/2013] [Indexed: 10/26/2022]
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Taraban MB, Hyland LL, Yu YB. Split of chiral degeneracy in mechanical and structural properties of oligopeptide-polysaccharide biomaterials. Biomacromolecules 2013; 14:3192-201. [PMID: 23879188 PMCID: PMC3869456 DOI: 10.1021/bm4008309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Enantiomeric biomaterials which are mirror images of each other are characterized by chiral degeneracy--identical structural characteristics and bulk material properties. The addition of another chiral component, D-polysaccharide, has been shown to split such degeneracy and result in two distinct biomaterials. Dynamic oscillatory rheometry and small-angle X-ray scattering demonstrate that the natural biochirality combination of L-peptides and D-polysaccharides assembles faster, has higher elastic moduli (G'), and is structurally more beneficial as opposed to the alternative D-peptide and D-polysaccharide combination. Chemical modifications of the OH-groups in α-D-glucose units in D-polysaccharides weaken such splitting of chiral degeneracy. These findings form a basis to design novel biomaterials and provide additional insight on why proteins and polysaccharides have oppoiste chirality in the biological world.
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Affiliation(s)
| | | | - Y. Bruce Yu
- To whom correspondence should be addressed. Current address of corresponding author: Department of Pharmaceutical Sciences, 20 Penn Street, Baltimore, MD 21201, USA; ; Phone: 410-706-7514; Fax 410-706-5017
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Gilbert RG, Wu AC, Sullivan MA, Sumarriva GE, Ersch N, Hasjim J. Improving human health through understanding the complex structure of glucose polymers. Anal Bioanal Chem 2013; 405:8969-80. [DOI: 10.1007/s00216-013-7129-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Revised: 06/01/2013] [Accepted: 06/06/2013] [Indexed: 10/26/2022]
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46
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Li E, Hasjim J, Singh V, Tizzotti M, Godwin ID, Gilbert RG. Insights into Sorghum Starch Biosynthesis from Structure Changes Induced by Different Growth Temperatures. Cereal Chem 2013. [DOI: 10.1094/cchem-09-12-0113-r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Enpeng Li
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, China, 430030
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Jovin Hasjim
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Vijaya Singh
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Morgan Tizzotti
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
| | - Ian D. Godwin
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
- The University of Queensland, School of Agriculture and Food Sciences, Brisbane, QLD 4072, Australia
| | - Robert G. Gilbert
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, China, 430030
- The University of Queensland, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, Brisbane, QLD 4072, Australia
- Corresponding author. Phone: +61 7 3365 4809. Fax: +61 7 3365 1188. E-mail:
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