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The free diffusion of macromolecules in tissue-engineered skeletal muscle subjected to large compression strains.
MedLine Citation:
PMID:  18068175     Owner:  NLM     Status:  MEDLINE    
Pressure-related deep tissue injury (DTI) represents a severe pressure ulcer, which initiates in compressed muscle tissue overlying a bony prominence and progresses to more superficial tissues until penetrating the skin. Individual subjects with impaired motor and/or sensory capacities are at high risk of developing DTI. Impaired diffusion of critical metabolites in compressed muscle tissue may contribute to DTI, and impaired diffusion of tissue damage biomarkers may further impose a problem in developing early detection blood tests. We hypothesize that compression of muscle tissue between a bony prominence and a supporting surface locally influences the diffusion capacity of muscle. The objective of this study was therefore, to determine the effects of large compression strains on free diffusion in a tissue-engineered skeletal muscle model. Diffusion was measured with a range of fluorescently labeled dextran molecules (10, 20, 150kDa) whose sizes were representative of both hormones and damage biomarkers. We used fluorescence recovery after photobleaching (FRAP) to compare diffusion coefficients (D) of the different dextrans between the uncompressed and compressed (48-60% strain) states. In a separate experiment, we simulated the effects of local partial muscle ischemia in vivo, by reducing the temperature of compressed specimens from 37 to 34 degrees C. Compared to the D in the uncompressed model system, values in the compressed state were significantly reduced by 47+/-22% (p<0.02). A 3 degrees C temperature decrease further reduced D in the compressed specimens by 10+/-6% (p<0.05). In vivo, the effects of large strains and ischemia are likely to be summative, and hence, the present findings suggest an important role of impaired diffusion in the etiology of DTI, and should also be considered when developing biochemical screening methods for early detection of DTI.
Amit Gefen; Lisette H Cornelissen; Debby Gawlitta; Dan L Bader; Cees W J Oomens
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Publication Detail:
Type:  Journal Article     Date:  2008-02-20
Journal Detail:
Title:  Journal of biomechanics     Volume:  41     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2008  
Date Detail:
Created Date:  2008-03-03     Completed Date:  2008-07-22     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  845-53     Citation Subset:  IM    
Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
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MeSH Terms
Cell Line
Compressive Strength / physiology
Dextrans / metabolism*
Fluorescence Recovery After Photobleaching
Microscopy, Confocal
Muscle, Skeletal / cytology,  injuries,  metabolism*,  pathology
Pressure Ulcer / etiology*,  metabolism*,  pathology
Sprains and Strains / complications,  metabolism*,  pathology
Tissue Engineering*
Reg. No./Substance:

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