A Fragment of the LG3 Peptide of Endorepellin Is Present in the Urine of Physically Active Mining Workers: A Potential Marker of Physical Activity

Biomarker analysis has been implemented in sports research in an attempt to monitor the effects of exertion and fatigue in athletes. This study proposed that while such biomarkers may be useful for monitoring injury risk in workers, proteomic approaches might also be utilised to identify novel exertion or injury markers. We found that urinary urea and cortisol levels were significantly elevated in mining workers following a 12 hour overnight shift. These levels failed to return to baseline over 24 h in the more active maintenance crew compared to truck drivers (operators) suggesting a lack of recovery between shifts. Use of a SELDI-TOF MS approach to detect novel exertion or injury markers revealed a spectral feature which was associated with workers in both work categories who were engaged in higher levels of physical activity. This feature was identified as the LG3 peptide, a C-terminal fragment of the anti-angiogenic/anti-tumourigenic protein endorepellin. This finding suggests that urinary LG3 peptide may be a biomarker of physical activity. It is also possible that the activity mediated release of LG3/endorepellin into the circulation may represent a biological mechanism for the known inverse association between physical activity and cancer risk/survival

Wound management innovation cooperative research centre - a new model for inter-disciplinary wound research [Editorial]

Wound research is a complex multidimensional activity most effectively conducted by inter-disciplinary teams that connect studies in basic wound biology, devices and biomaterials with clinical practice. These complexities have been recognised in a new initiative through the establishment of an inter-disciplinary wound research centre in Australia; the Wound Management Innovation Cooperative Research Centre (WMI CRC). The centre is funded by the Australian Government's Cooperative Research Centre Program and a consortium of 22 participants and has a resource of US$108 million over 8 years..

Transglutaminases and receptor tyrosine kinases

Transglutaminases are confounding enzymes which are known to play key roles in various cellular processes. In this paper, we aim to bring together several pieces of evidence from published research and literature that suggest a potentially vital role for transglutaminases in receptor tyrosine kinases (RTK) signalling. We cite literature that confirms and suggests the formation of integrin:RTK:transglutaminase complexes and explores the occurrence and functionality of these complexes in a large fraction of the RTK family

Hyperbaric Oxygen Stimulates Epidermal Reconstruction in Human Skin Equivalents

The crucial role of oxygen during the complex process of wound healing has been extensively described. In chronic or nonhealing wounds, much evidence has been reported indicating that a lack of oxygen is a major contributing factor. Although still controversial, the therapeutic application of hyperbaric oxygen (HBO) therapy can aid the healing of chronic wounds. However, how HBO affects reepithelization, involving processes such as keratinocyte proliferation and differentiation, remains unclear. We therefore used a three-dimensional human skin-equivalent (HSE) model to investigate the effects of daily 90-minute HBO treatments on the reconstruction of an epidermis. Epidermal markers of proliferation, differentiation, and basement membrane components associated with a developing epidermis, including p63, collagen type IV, and cytokeratins 6, 10, and 14, were evaluated. Morphometric analysis of hematoxylin and eosin-stained cross sections revealed that HBO treatments significantly accelerated cornification of the stratum corneum compared with controls. Protein expression as determined by immunohistochemical analysis confirmed the accelerated epidermal maturation. In addition, early keratinocyte migration was enhanced by HBO. Thus, HBO treatments stimulate epidermal reconstruction in an HSE. These results further support the importance of oxygen during the process of wound healing and the potential role of HBO therapy in cutaneous wound healing

Hyaluronic acid: Evaluation as a potential delivery vehicle for vitronectin: growth factor complexes in wound healing applications

We have previously reported that novel vitronectin:growth factor (VN:GF) complexes significantly increase re-epithelialization in a porcine deep dermal partial-thickness burn model. However, the potential exists to further enhance the healing response through combination with an appropriate delivery vehicle which facilitates sustained local release and reduced doses of VN:GF complexes. Hyaluronic acid (HA), an abundant constituent of the interstitium, is known to function as a reservoir for growth factors and other bioactive species. The physicochemical properties of HA confer it with an ability to sustain elevated pericellular concentrations of these species. This has been proposed to arise via HA prolonging interactions of the bioactive species with cell surface receptors and/or protecting them from degradation. In view of this, the potential of HA to facilitate the topical delivery of VN:GF complexes was evaluated. Two-dimensional (2D) monolayer cell cultures and 3D de-epidermised dermis (DED) human skin equivalent (HSE) models were used to test skin cell responses to HA and VN:GF complexes. Our 2D studies revealed that VN:GF complexes and HA stimulate the proliferation of human fibroblasts but not keratinocytes. Experiments in our 3D DED-HSE models showed that VN:GF complexes, both alone and in conjunction with HA, led to enhanced development of both the proliferative and differentiating layers in the DED-HSE models. However, there was no significant difference between the thicknesses of the epidermis treated with VN:GF complexes alone and VN:GF complexes together with HA. While the addition of HA did not enhance all the cellular responses to VN:GF complexes examined, it was not inhibitory, and may confer other advantages related to enhanced absorption and transport that could be beneficial in delivery of the VN:GF complexes to wounds

Proteomics in chronic wound research: potentials in healing and health

Chronic wounds, such as venous and diabetic leg ulcers, represent a significant health and financial burden to individuals and healthcare systems. In worst case scenarios this condition may require the amputation of an affected limb, with significant impact on patient quality of life and health. Presently there are no clinical biochemical analyses used in the diagnosis and management of this condition; moreover few biochemical therapies are accessible to patients. This presents a significant challenge in the efficient and efficacious treatment of chronic wounds by medical practitioners. A number of protein-centric investigations have analysed the wound environment and implicated a suite of molecular species predicted to be involved in the initiation or perpetuation of the condition. However, comprehensive proteomic investigation is yet to be engaged in the analysis of chronic wounds for the identification of molecular diagnostic/prognostic markers of healing or therapeutic targets. This review examines clinical chronic wound research and recommends a path towards proteomic investigation for the discovery of medically significant targets. Additionally, the supplementary documents associated with this review provide the first comprehensive summary of protein-centric, small molecule and elemental analyses in clinical chronic wound research

Production and characterization of nonmammalian insulin-like growth factors / by Zee Upton.

Bibliography: leaves 125-167.vii, 167, [96] leaves, [14] leaves of plates : ill. ; 30 cm.Details the production by gene-fusion strategies and downstream processing procedures and characterization of recombinant nonmammalian (chicken and hagfish) insulin-like growth factors.Thesis (Ph.D.)--University of Adelaide, Dept. of Biochemistry, 199

Why Australian and Indian researchers should collaborate to advance wound management innovation

In 2011, 366 million people suffered from diabetes worldwide, resulting in 4.6 million deaths at a cost of US$465 billion in direct healthcare expenditures1. India has the world’s second largest diabetic population at 61.8 million (8.3% of total population)1, while in Australia 8.1% of the population have been diagnosed with diabetes1. Diabetic foot ulcers (DFUs) affect up to 25% of diabetic patients, precipitating 85% of all diabetic amputations2,3. DFUs have significant social and economic impacts associated with increased hospitalisation rates, cost of care, and the reduced capacity of patients and carers to work. In isolated regions of Australia and India the incidence of DFU and associated infection is substantially increased, resulting in hospitalisation rates up to 4- fold that of major cities..

Effects of oxygen on zonal marker expression in human articular chondrocytes

Articular cartilage is organized in depth zones with phenotypically distinct subpopulations of chondrocytes that are exposed to different oxygen tensions. Despite growing evidence of the critical role for oxygen in chondrogenesis, little is known about its effect on chondrocytes from different zones. This study evaluates zonal marker expression of human articular chondrocytes from different zones under various oxygen tensions. Chondrocytes isolated from full-thickness, superficial, and middle/deep cartilage from knee replacement surgeries were expanded and redifferentiated under hypoxic (5% O 2) or normoxic (20% O 2) conditions. Differentiation under hypoxia increased expression of hypoxia-inducible factors 1alpha and 2alpha and accumulation of extracellular matrix, particularly in middle/deep chondrocytes, and favored re-expression of proteoglycan 4 by superficial chondrocytes compared with middle/deep cells. Zone-dependent expression of clusterin varied with culture duration. These results demonstrate that zonal chondrocytes retain important phenotypic differences during in vitro cultivation, and that these characteristics can be improved by altering the oxygen environment. However, transcript levels for pleiotrophin, cartilage intermediate layer protein, and collagen type X were similar between zones, challenging their reliability as zonal markers for tissue-engineered cartilage from osteoarthritis patients. Key factors including oxygen tension and cell source should be considered to prescribe zone-specific properties to tissue-engineered cartilage. © 2012, Mary Ann Liebert, Inc