1
|
Nesbitt DQ, Pu X, Turner MW, Zavala AG, Bond L, Oxford JT, Lujan TJ. Age-dependent changes in collagen crosslinks reduce the mechanical toughness of human meniscus. J Orthop Res 2024; 42:1870-1879. [PMID: 38491967 DOI: 10.1002/jor.25824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 01/31/2024] [Accepted: 02/19/2024] [Indexed: 03/18/2024]
Abstract
The mechanical resilience of the knee meniscus is provided by a group of structural proteins in the extracellular matrix. Aging can alter the quantity and molecular structure of these proteins making the meniscus more susceptible to debilitating tears. In this study, we determined the effect of aging on the quantity of structural proteins and collagen crosslinks in human lateral meniscus, and examined whether the quantity of these molecules was predictive of tensile toughness (area under the stress-strain curve). Two age groups were tested: a young group under 40 and an older group over 65 years old. Using mass spectrometry, we quantified the abundance of proteins and collagen crosslinks in meniscal tissue that was adjacent to the dumbbell-shaped specimens used to measure uniaxial tensile toughness parallel or perpendicular to the circumferential fiber orientation. We found that the enzymatic collagen crosslink deoxypyridinoline had a significant positive correlation with toughness, and reductions in the quantity of this crosslink with aging were associated with a loss of toughness in the ground substance and fibers. The non-enzymatic collagen crosslink carboxymethyl-lysine increased in quantity with aging, and these increases corresponded to reductions in ground substance toughness. For the collagenous (Types I, II, IV, VI, VIII) and non-collagenous structural proteins (elastin, decorin, biglycan, prolargin) analyzed in this study, only the quantity of collagen VIII was predictive of toughness. This study provides valuable insights on the structure-function relationships of the human meniscus, and how aging causes structural adaptations that weaken the tissue's mechanical integrity.
Collapse
Affiliation(s)
- Derek Q Nesbitt
- Biomedical Engineering Doctoral Program, Boise State University, Boise, Idaho, USA
| | - Xinzhu Pu
- Biomolecular Research Institute, College of Arts and Sciences, Boise State University, Boise, Idaho, USA
| | - Matthew W Turner
- Department of Biological Sciences, Boise State University, Boise, Idaho, USA
| | - Anamaria G Zavala
- Department of Mechanical & Biomedical Engineering, Boise State University, Boise, Idaho, USA
| | - Laura Bond
- Biomolecular Research Institute, College of Arts and Sciences, Boise State University, Boise, Idaho, USA
| | - Julia T Oxford
- Biomedical Engineering Doctoral Program, Boise State University, Boise, Idaho, USA
- Biomolecular Research Institute, College of Arts and Sciences, Boise State University, Boise, Idaho, USA
- Department of Biological Sciences, Boise State University, Boise, Idaho, USA
| | - Trevor J Lujan
- Biomedical Engineering Doctoral Program, Boise State University, Boise, Idaho, USA
- Department of Mechanical & Biomedical Engineering, Boise State University, Boise, Idaho, USA
| |
Collapse
|
2
|
Zhang J, Zhu J, Zou X, Liu Y, Zhao B, Chen L, Li B, Chen B. Identifying autophagy-related mRNAs and potential ceRNA networks in meniscus degeneration based on RNA sequencing and experimental validation. Heliyon 2024; 10:e32782. [PMID: 38975204 PMCID: PMC11226846 DOI: 10.1016/j.heliyon.2024.e32782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 05/25/2024] [Accepted: 06/10/2024] [Indexed: 07/09/2024] Open
Abstract
Purpose The intimate connection between long noncoding RNA (lncRNA) and autophagy has been established in cartilage degeneration. However, their roles in meniscal degeneration remain ambiguous. This study aimed to identify the key autophagy-related lncRNA and its associated regulatory network in meniscal degeneration in the context of osteoarthritis (OA). Methods RNA sequencing was performed to identify differentially expressed lncRNAs (DELs) and mRNAs (DEMs), which were then conducted to enrichment analyses using the DAVID database and Metascape. Autophagy-related DEMs were identified by combining DEMs with data from the Human Autophagy Database. Three databases were used to predict miRNA, and the DIANA LncBase Predicted database was utilized to predict miRNA-lncRNA interactions. Based on these predictions, comprehensive competitive endogenous RNA (ceRNA) network were constructed. The expression levels of the classical autophagy markers and autophagy-related ceRNA network were validated. Additionally, Gene Set Enrichment Analysis (GSEA) was performed using autophagy-related DEMs. Results 310 DELs and 320 DEMs were identified, with five upregulated and one downregulated autophagy-related DEMs. Through reverse prediction of miRNA, paired miRNA-lncRNA interactions, and verification using RT-qPCR, two lncRNAs (PCAT19, CLIP1-AS1), two miRNA (has-miR-3680-3p and has-miR-4795-3p) and two mRNAs (BAG3 and HSP90AB1) were included in the constructed ceRNA regulatory networks. GSEA indicated that the increased expression of autophagy-related mRNAs inhibited glycosaminoglycan biosynthesis in the degenerative meniscus. Conclusion This study presented the first construction of regulatory ceRNA network involving autophagy-related lncRNA-miRNA-mRNA interactions in OA meniscus. These findings offered valuable insights into the mechanisms underlying meniscal degeneration and provided potential targets for therapeutic intervention.
Collapse
Affiliation(s)
- Jun Zhang
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, 330008, Jiangxi, China
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Jiayong Zhu
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Xinyu Zou
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Yiming Liu
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Boming Zhao
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Liaobin Chen
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Bin Li
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| | - Biao Chen
- Division of Joint Surgery and Sports Medicine, Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430000, Hubei, China
| |
Collapse
|
3
|
Dubuc J, Schneider MJ, Dubuc V, Richard H, Pinsard M, Bancelin S, Legare F, Girard C, Laverty S. Degradation of Proteoglycans and Collagen in Equine Meniscal Tissues. Int J Mol Sci 2024; 25:6439. [PMID: 38928148 PMCID: PMC11203490 DOI: 10.3390/ijms25126439] [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: 04/02/2024] [Revised: 05/28/2024] [Accepted: 05/30/2024] [Indexed: 06/28/2024] Open
Abstract
Investigate meniscal extracellular matrix degradation. Equine menisci (n = 34 from 17 horses) were studied. Site-matched sections were cut and scored from three regions (ROIs; n = 102) and stained for histology, proteoglycan (safranin O and fast green), aggrecan, and collagen cleavage (NITEGE, DIPEN, and C1,2C antibodies, respectively). Picrosirius red and second harmonic generation microscopy were performed to investigate collagen ultrastructure. A total of 42 ROIs met the inclusion criteria and were included in the final analysis. The median (range) ROI histological score was 3 (0-9), providing a large spectrum of pathology. The median (range) proteoglycan score was 1 (0-3), representing superficial and central meniscal loss. The median (range) of DIPEN, NITEGE, and C1,2C scores was 1 (0-3), revealing immunostaining of the femoral and tibial surfaces. The proteoglycan scores exhibited significant positive associations with both histologic evaluation (p = 0.03) and DIPEN scores (p = 0.02). Additionally, a robust positive association (p = 0.007) was observed between the two aggrecanolysis indicators, NITEGE and DIPEN scores. A negative association (p = 0.008) was identified between NITEGE and histological scores. The C1,2C scores were not associated with any other scores. Picrosirius red and second harmonic generation microscopy (SHGM) illustrated the loss of the collagen matrix and structure centrally. Proteoglycan and collagen degradation commonly occur superficially in menisci and less frequently centrally. The identification of central meniscal proteoglycan and collagen degradation provides novel insight into central meniscal degeneration. However, further research is needed to elucidate the etiology and sequence of degradative events.
Collapse
Affiliation(s)
- Julia Dubuc
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| | - Melodie Jil Schneider
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| | - Valerie Dubuc
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| | - Helene Richard
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| | - Maxime Pinsard
- Institut National de la Recherche Scientifique, Université du Quebec, 1650 Bd Lionel-Boulet, Varennes, Quebec, QC J3X1P7, Canada
| | - Stephane Bancelin
- Institut National de la Recherche Scientifique, Université du Quebec, 1650 Bd Lionel-Boulet, Varennes, Quebec, QC J3X1P7, Canada
| | - Francois Legare
- Institut National de la Recherche Scientifique, Université du Quebec, 1650 Bd Lionel-Boulet, Varennes, Quebec, QC J3X1P7, Canada
| | - Christiane Girard
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| | - Sheila Laverty
- Comparative Orthopedic Research Laboratory, Department of Clinical Sciences, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte Saint-Hyacinthe, Quebec, QC J2S2M2, Canada; (J.D.); (M.J.S.); (V.D.); (H.R.); (C.G.)
| |
Collapse
|
4
|
Mathis K, Gaddam S, Koneru R, Sunkavalli N, Wang C, Patel M, Kohon AI, Meckes B. Multifunctional hydrogels with spatially controlled light activation with photocaged oligonucleotides. CELL REPORTS. PHYSICAL SCIENCE 2024; 5:101922. [PMID: 38911357 PMCID: PMC11192495 DOI: 10.1016/j.xcrp.2024.101922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/25/2024]
Abstract
Recreating tissue environments with precise control over mechanical, biochemical, and cellular organization is essential for next-generation tissue models for drug discovery, development studies, and the replication of disease environments. However, controlling these properties at cell-scale lengths remains challenging. Here, we report the development of printing approaches that leverage polyethylene glycol diacrylate (PEGDA) hydrogels containing photocaged oligonucleotides to spatially program material characteristics with non-destructive, non-ultraviolet light. We further integrate this system with a perfusion chamber to allow us to alter the composition of PEGDA hydrogels while retaining common light-activatable photocaged DNAs. We demonstrate that the hydrogels can capture DNA functionalized materials, including cells coated with complementary oligonucleotides with spatial control using biocompatible wavelengths. Overall, these materials open pathways to orthogonal capture of any DNA functionalized materials while not changing the sequences of the DNA.
Collapse
Affiliation(s)
- Katelyn Mathis
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- BioDiscovery Institute, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Saanvi Gaddam
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- Texas Academy of Mathematics and Science, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Rishi Koneru
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- Texas Academy of Mathematics and Science, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Nikhil Sunkavalli
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- Texas Academy of Mathematics and Science, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Catherine Wang
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- Texas Academy of Mathematics and Science, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Manan Patel
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- Texas Academy of Mathematics and Science, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Afia Ibnat Kohon
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- BioDiscovery Institute, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Brian Meckes
- Department of Biomedical Engineering, University of North Texas, 3940 North Elm St., Denton, TX 76207, USA
- BioDiscovery Institute, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
- Lead contact
| |
Collapse
|
5
|
Weiske M, Riedel B, Kubosch EJ, Mayr HO, Schmal H, Seidenstuecker M. Mechanical and histological properties of native medial menisci compared to allograph medial menisci in the osteoarthritic knee. Front Bioeng Biotechnol 2024; 12:1364536. [PMID: 38707504 PMCID: PMC11066244 DOI: 10.3389/fbioe.2024.1364536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 03/28/2024] [Indexed: 05/07/2024] Open
Abstract
This study was designed to provide information on how the menisci change over the course of osteoarthritis, particularly with regard to their mechanical properties. The aim was to determine the difference between healthy menisci (fresh frozen meniscal transplants) and menisci harvested during total knee arthroplasty. The latter allows the grading of age-related and osteoarthritic changes in the menisci on macroscopic and microscopic levels. A total of 10 menisci from arthritic knee joints (medial) harvested during total knee arthroplasty were used and compared with 10 medial fresh frozen meniscal transplants. The mechanical measurements were carried out on a Mach-1 testing machine using indentation testing to determine the instantaneous modulus and the thickness of the menisci. The specimens were then embedded in paraffin, sectioned on a microtome, and stained with hematoxylin-eosin and safranin-O. All measurements were divided into the anterior horn, pars intermedia, and posterior horn. There was no significant difference in the instantaneous modulus for the posterior horn in the fresh frozen menisci with 0.27 ± 0.1 MPa compared to the arthritic menisci with 0.18 ± 0.03 MPa. No significant difference could be determined for the meniscus thicknesses. There was a significant difference in the safranin-O staining. There were also significant differences in the Pauli score: the arthrosis menisci showed a sum score that was, on average, four times higher than the sum score of the fresh frozen menisci. In the present study, it could be shown very well that there are significant differences in the mechanical properties as well as in the macroscopic and histopathological scores, such as the Pauli score, between the fresh frozen meniscus allografts considered healthy and osteoarthritic menisci resulting from total knee arthroplasty. With a degradation score of 3 (Pauli), the instantaneous modulus was reduced by more than 50% compared to healthy controls. More importantly, however, the fresh frozen menisci only show a grade 2 when converting the sum values into grades, where a grade 2 indicates slight degeneration. This is interesting because fresh frozen meniscus transplants were always considered healthy in previous publications and should, therefore, actually have a grade 1.
Collapse
Affiliation(s)
- Max Weiske
- G.E.R.N. Tissue Replacement, Regeneration & Neogenesis, Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| | - Bianca Riedel
- G.E.R.N. Tissue Replacement, Regeneration & Neogenesis, Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| | - Eva Johanna Kubosch
- Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| | - Hermann O. Mayr
- Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| | - Hagen Schmal
- Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| | - Michael Seidenstuecker
- G.E.R.N. Tissue Replacement, Regeneration & Neogenesis, Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
- Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg, Germany
| |
Collapse
|
6
|
Orton K, Batchelor W, Ziebarth NM, Best TM, Travascio F, Jackson AR. Biomechanical properties of porcine meniscus as determined via AFM: Effect of region, compartment and anisotropy. PLoS One 2023; 18:e0280616. [PMID: 36662701 PMCID: PMC9858324 DOI: 10.1371/journal.pone.0280616] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 01/04/2023] [Indexed: 01/21/2023] Open
Abstract
The meniscus is a fibrocartilaginous tissue that plays an essential role in load transmission, lubrication, and stabilization of the knee. Loss of meniscus function, through degeneration or trauma, can lead to osteoarthritis in the underlying articular cartilage. To perform its crucial function, the meniscus extracellular matrix has a particular organization, including collagen fiber bundles running circumferentially, allowing the tissue to withstand tensile hoop stresses developed during axial loading. Given its critical role in preserving the health of the knee, better understanding structure-function relations of the biomechanical properties of the meniscus is critical. The main objective of this study was to measure the compressive modulus of porcine meniscus using Atomic Force Microscopy (AFM); the effects of three key factors were investigated: direction (axial, circumferential), compartment (medial, lateral) and region (inner, outer). Porcine menisci were prepared in 8 groups (= 2 directions x 2 compartments x 2 regions) with n = 9 per group. A custom AFM was used to obtain force-indentation curves, which were then curve-fit with the Hertz model to determine the tissue's compressive modulus. The compressive modulus ranged from 0.75 to 4.00 MPa across the 8 groups, with an averaged value of 2.04±0.86MPa. Only direction had a significant effect on meniscus compressive modulus (circumferential > axial, p = 0.024), in agreement with earlier studies demonstrating that mechanical properties in the tissue are anisotropic. This behavior is likely the result of the particular collagen fiber arrangement in the tissue and plays a key role in load transmission capability. This study provides important information on the micromechanical properties of the meniscus, which is crucial for understanding tissue pathophysiology, as well as for developing novel treatments for tissue repair.
Collapse
Affiliation(s)
- Kevin Orton
- Miller School of Medicine, University of Miami, Miami, Florida, United States of America
| | - Wyndham Batchelor
- Department of Biomedical Engineering, University of Miami, Coral Gables, Florida, United States of America
| | - Noel M. Ziebarth
- Department of Biomedical Engineering, University of Miami, Coral Gables, Florida, United States of America
| | - Thomas M. Best
- Miller School of Medicine, University of Miami, Miami, Florida, United States of America
- Department of Biomedical Engineering, University of Miami, Coral Gables, Florida, United States of America
- Department of Orthopedics, University of Miami Sports Medicine Institute, Coral Gables, Florida, United States of America
| | - Francesco Travascio
- Miller School of Medicine, University of Miami, Miami, Florida, United States of America
- Department of Mechanical and Aerospace Engineering, University of Miami, Coral Gables, Florida, United States of America
- Max Biedermann Institute for Biomechanics at Mount Sinai Medical Center, Miami Beach, Florida, United States of America
| | - Alicia R. Jackson
- Department of Biomedical Engineering, University of Miami, Coral Gables, Florida, United States of America
| |
Collapse
|
7
|
Atomic force microscopy (AFM) and its applications to bone-related research. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2022; 176:52-66. [DOI: 10.1016/j.pbiomolbio.2022.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 09/19/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022]
|
8
|
Late Changes in the Extracellular Matrix of the Bladder after Radiation Therapy for Pelvic Tumors. Diagnostics (Basel) 2021; 11:diagnostics11091615. [PMID: 34573958 PMCID: PMC8468698 DOI: 10.3390/diagnostics11091615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/26/2021] [Accepted: 08/31/2021] [Indexed: 11/16/2022] Open
Abstract
Radiation therapy is one of the cardinal approaches in the treatment of malignant tumors of the pelvis. It leads to the development of radiation-induced complications in the normal tissues. Thus, the evaluation of radiation-induced changes in the extracellular matrix of the normal tissue is deemed urgent, since connective tissue stroma degradation plays a crucial role in the development of Grade 3-4 adverse effects (hemorrhage, necrosis, and fistula). Such adverse effects not only drastically reduce the patients' quality of life but can also become life-threatening. The aim of this study is to quantitatively analyze the bladder collagen state in patients who underwent radiation therapy for cervical and endometrial cancer and in patients with chronic bacterial cystitis and compare them to the normal bladder extracellular matrix. MATERIALS AND METHODS One hundred and five patients with Grade 2-4 of radiation cystitis, 67 patients with bacterial chronic cystitis, and 20 volunteers without bladder pathology were enrolled. Collagen changes were evaluated depending on its hierarchical level: fibrils and fibers level by atomic force microscopy; fibers and bundles level by two-photon microscopy in the second harmonic generation (SHG) mode; general collagen architectonics by cross-polarization optical coherence tomography (CP OCT). RESULTS The main sign of the radiation-induced damage of collagen fibrils and fibers was the loss of the ordered "basket-weave" packing and a significant increase in the total area of ruptures deeper than 1 µm compared to the intact sample. The numerical analysis of SHG images detected that a decrease in the SHG signal intensity of collagen is correlated with the increase in the grade of radiation cystitis. The OCT signal brightness in cross-polarization images demonstrated a gradual decrease compared to the intact bladder depending on the grade of the adverse event. CONCLUSIONS The observed correspondence between the extracellular matrix changes at the microscopic level and at the level of the general organ architectonics allows for the consideration of CP OCT as a method of "optical biopsy" in the grading of radiation-induced collagen damage.
Collapse
|
9
|
Evolution of Meniscal Biomechanical Properties with Growth: An Experimental and Numerical Study. Bioengineering (Basel) 2021; 8:bioengineering8050070. [PMID: 34065530 PMCID: PMC8160968 DOI: 10.3390/bioengineering8050070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/03/2021] [Accepted: 05/17/2021] [Indexed: 11/17/2022] Open
Abstract
The menisci of the knee are complex fibro-cartilaginous tissues that play important roles in load bearing, shock absorption, joint lubrication, and stabilization. The objective of this study was to evaluate the interaction between the different meniscal tissue components (i.e., the solid matrix constituents and the fluid phase) and the mechanical response according to the developmental stage of the tissue. Menisci derived from partially and fully developed pigs were analyzed. We carried out biochemical analyses to quantify glycosaminoglycan (GAG) and DNA content according to the developmental stage. These values were related to tissue mechanical properties that were measured in vitro by performing compression and tension tests on meniscal specimens. Both compression and tension protocols consisted of multi-ramp stress-relaxation tests comprised of increasing strains followed by stress-relaxation to equilibrium. To better understand the mechanical response to different directions of mechanical stimulus and to relate it to the tissue structural composition and development, we performed numerical simulations that implemented different constitutive models (poro-elasticity, viscoelasticity, transversal isotropy, or combinations of the above) using the commercial software COMSOL Multiphysics. The numerical models also allowed us to determine several mechanical parameters that cannot be directly measured by experimental tests. The results of our investigation showed that the meniscus is a non-linear, anisotropic, non-homogeneous material: mechanical parameters increase with strain, depend on the direction of load, and vary among regions (anterior, central, and posterior). Preliminary numerical results showed the predominant role of the different tissue components depending on the mechanical stimulus. The outcomes of biochemical analyses related to mechanical properties confirmed the findings of the numerical models, suggesting a specific response of meniscal cells to the regional mechanical stimuli in the knee joint. During maturation, the increase in compressive moduli could be explained by cell differentiation from fibroblasts to metabolically active chondrocytes, as indicated by the found increase in GAG/DNA ratio. The changes of tensile mechanical response during development could be related to collagen II accumulation during growth. This study provides new information on the changes of tissue structural components during maturation and the relationship between tissue composition and mechanical response.
Collapse
|
10
|
Seitz AM, Osthaus F, Schwer J, Warnecke D, Faschingbauer M, Sgroi M, Ignatius A, Dürselen L. Osteoarthritis-Related Degeneration Alters the Biomechanical Properties of Human Menisci Before the Articular Cartilage. Front Bioeng Biotechnol 2021; 9:659989. [PMID: 34026741 PMCID: PMC8134692 DOI: 10.3389/fbioe.2021.659989] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 03/24/2021] [Indexed: 12/15/2022] Open
Abstract
An exact understanding of the interplay between the articulating tissues of the knee joint in relation to the osteoarthritis (OA)-related degeneration process is of considerable interest. Therefore, the aim of the present study was to characterize the biomechanical properties of mildly and severely degenerated human knee joints, including their menisci and tibial and femoral articular cartilage (AC) surfaces. A spatial biomechanical mapping of the articulating knee joint surfaces of 12 mildly and 12 severely degenerated human cadaveric knee joints was assessed using a multiaxial mechanical testing machine. To do so, indentation stress relaxation tests were combined with thickness and water content measurements at the lateral and medial menisci and the AC of the tibial plateau and femoral condyles to calculate the instantaneous modulus (IM), relaxation modulus, relaxation percentage, maximum applied force during the indentation, and the water content. With progressing joint degeneration, we found an increase in the lateral and the medial meniscal instantaneous moduli (p < 0.02), relaxation moduli (p < 0.01), and maximum applied forces (p < 0.01), while for the underlying tibial AC, the IM (p = 0.01) and maximum applied force (p < 0.01) decreased only at the medial compartment. Degeneration had no influence on the relaxation percentage of the soft tissues. While the water content of the menisci did not change with progressing degeneration, the severely degenerated tibial AC contained more water (p < 0.04) compared to the mildly degenerated tibial cartilage. The results of this study indicate that degeneration-related (bio-)mechanical changes seem likely to be first detectable in the menisci before the articular knee joint cartilage is affected. Should these findings be further reinforced by structural and imaging analyses, the treatment and diagnostic paradigms of OA might be modified, focusing on the early detection of meniscal degeneration and its respective treatment, with the final aim to delay osteoarthritis onset.
Collapse
Affiliation(s)
- Andreas M Seitz
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Felix Osthaus
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Jonas Schwer
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Daniela Warnecke
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Martin Faschingbauer
- Department of Orthopedic Surgery, Universitäts- und Rehabilitationskliniken Ulm (RKU), Ulm University Medical Center, Ulm, Germany
| | - Mirco Sgroi
- Department of Orthopedic Surgery, Universitäts- und Rehabilitationskliniken Ulm (RKU), Ulm University Medical Center, Ulm, Germany
| | - Anita Ignatius
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Lutz Dürselen
- Institute of Orthopedic Research and Biomechanics, Center of Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| |
Collapse
|
11
|
Seitz AM, Schall F, Hacker SP, van Drongelen S, Wolf S, Dürselen L. Forces at the Anterior Meniscus Attachments Strongly Increase Under Dynamic Knee Joint Loading. Am J Sports Med 2021; 49:994-1004. [PMID: 33560867 DOI: 10.1177/0363546520988039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The anatomic appearance and biomechanical and clinical importance of the anterior meniscus roots are well described. However, little is known about the loads that act on these attachment structures under physiological joint loads and movements. HYPOTHESES As compared with uniaxial loading conditions under static knee flexion angles or at very low flexion-extension speeds, more realistic continuous movement simulations in combination with physiological muscle force simulations lead to significantly higher anterior meniscus attachment forces. This increase is even more pronounced in combination with a longitudinal meniscal tear or after total medial meniscectomy. STUDY DESIGN Controlled laboratory study. METHODS A validated Oxford Rig-like knee simulator was used to perform a slow squat, a fast squat, and jump landing maneuvers on 9 cadaveric human knee joints, with and without muscle force simulation. The strains in the anterior medial and lateral meniscal periphery and the respective attachments were determined in 3 states: intact meniscus, medial longitudinal tear, and total medial meniscectomy. To determine the attachment forces, a subsequent in situ tensile test was performed. RESULTS Muscle force simulation resulted in a significant strain increase at the anterior meniscus attachments of up to 308% (P < .038) and the anterior meniscal periphery of up to 276%. This corresponded to significantly increased forces (P < .038) acting in the anteromedial attachment with a maximum force of 140 N, as determined during the jump landing simulation. Meniscus attachment strains and forces were significantly influenced (P = .008) by the longitudinal tear and meniscectomy during the drop jump simulation. CONCLUSION Medial and lateral anterior meniscus attachment strains and forces were significantly increased with physiological muscle force simulation, corroborating our hypothesis. Therefore, in vitro tests applying uniaxial loads combined with static knee flexion angles or very low flexion-extension speeds appear to underestimate meniscus attachment forces. CLINICAL RELEVANCE The data of the present study might help to optimize the anchoring of meniscal allografts and artificial meniscal substitutes to the tibial plateau. Furthermore, this is the first in vitro study to indicate reasonable minimum stability requirements regarding the reattachment of torn anterior meniscus roots.
Collapse
Affiliation(s)
- Andreas Martin Seitz
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Florian Schall
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Steffen Paul Hacker
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| | - Stefan van Drongelen
- Motion Analysis, Orthopaedic University Hospital Heidelberg, Heidelberg, Germany.,Dr Rolf M. Schwiete Research Unit for Arthrosis, Orthopaedic University Hospital Friedrichsheim gGmbH, Frankfurt am Main, Germany
| | - Sebastian Wolf
- Motion Analysis, Orthopaedic University Hospital Heidelberg, Heidelberg, Germany
| | - Lutz Dürselen
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Center, Ulm, Germany
| |
Collapse
|
12
|
Warnecke D, Balko J, Haas J, Bieger R, Leucht F, Wolf N, Schild NB, Stein SEC, Seitz AM, Ignatius A, Reichel H, Mizaikoff B, Dürselen L. Degeneration alters the biomechanical properties and structural composition of lateral human menisci. Osteoarthritis Cartilage 2020; 28:1482-1491. [PMID: 32739340 DOI: 10.1016/j.joca.2020.07.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 06/29/2020] [Accepted: 07/20/2020] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Because the literature relating to the influence of degeneration on the viscoelasticity and tissue composition of human lateral menisci remains contradictory or completely lacking, the aim of this study was to fill these gaps by comprehensively characterising the biomechanical properties of menisci with regard to the degree of degeneration. DESIGN Meniscal tissue from 24 patients undergoing a total knee replacement was collected and the degeneration of each region classified according to Pauli et al. For biomechanical characterisation, compression and tensile tests were performed. Additionally, the water content was determined and infrared (IR) spectroscopy was applied to detect changes in the structural composition, particularly of the proteoglycan and collagen content. RESULTS With an increasing degree of degeneration, a significant decrease of the equilibrium modulus was detected, while simultaneously the water content and the hydraulic permeability significantly increased. However, the tensile modulus displayed a tendency to decrease with increasing degeneration, which might be due to the significantly decreasing amount of collagen content identified by the IR measurements. CONCLUSION The findings of the current study may contribute to the understanding of meniscus degeneration, showing that degenerative processes appear to mainly worsen viscoelastic properties of the inner circumference by disrupting the collagen integrity.
Collapse
Affiliation(s)
- D Warnecke
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - J Balko
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - J Haas
- Institute for Analytical and Bioanalytical Chemistry, Ulm University, Germany.
| | - R Bieger
- Department of Orthopaedic Surgery, Ulm University Medical Centre, Germany.
| | - F Leucht
- Department of Orthopaedic Surgery, Ulm University Medical Centre, Germany.
| | - N Wolf
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - N B Schild
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - S E C Stein
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - A M Seitz
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - A Ignatius
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| | - H Reichel
- Department of Orthopaedic Surgery, Ulm University Medical Centre, Germany.
| | - B Mizaikoff
- Institute for Analytical and Bioanalytical Chemistry, Ulm University, Germany.
| | - L Dürselen
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Germany.
| |
Collapse
|
13
|
Grogan SP, Baek J, D'Lima DD. Meniscal tissue repair with nanofibers: future perspectives. Nanomedicine (Lond) 2020; 15:2517-2538. [PMID: 32975146 DOI: 10.2217/nnm-2020-0183] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The knee menisci are critical to the long-term health of the knee joint. Because of the high incidence of injury and degeneration, replacing damaged or lost meniscal tissue is extremely clinically relevant. The multiscale architecture of the meniscus results in unique biomechanical properties. Nanofibrous scaffolds are extremely attractive to replicate the biochemical composition and ultrastructural features in engineered meniscus tissue. We review recent advances in electrospinning to generate nanofibrous scaffolds and the current state-of-the-art of electrospun materials for meniscal regeneration. We discuss the importance of cellular function for meniscal tissue engineering and the application of cells derived from multiple sources. We compare experimental models necessary for proof of concept and to support translation. Finally, we discuss future directions and potential for technological innovations.
Collapse
Affiliation(s)
- Shawn P Grogan
- Shiley Center for Orthopedic Research & Education at Scripps Clinic 10666 North Torrey Pines Road, MS126, La Jolla, CA 92037, USA.,Department of Molecular Medicine, Scripps Research, 10550 North Torrey Pines Road, MB-102, La Jolla, CA 92037, USA
| | - Jihye Baek
- Shiley Center for Orthopedic Research & Education at Scripps Clinic 10666 North Torrey Pines Road, MS126, La Jolla, CA 92037, USA.,Department of Molecular Medicine, Scripps Research, 10550 North Torrey Pines Road, MB-102, La Jolla, CA 92037, USA
| | - Darryl D D'Lima
- Shiley Center for Orthopedic Research & Education at Scripps Clinic 10666 North Torrey Pines Road, MS126, La Jolla, CA 92037, USA.,Department of Molecular Medicine, Scripps Research, 10550 North Torrey Pines Road, MB-102, La Jolla, CA 92037, USA
| |
Collapse
|
14
|
Casal-Beiroa P, González P, Blanco FJ, Magalhães J. Molecular analysis of the destruction of articular joint tissues by Raman spectroscopy. Expert Rev Mol Diagn 2020; 20:789-802. [PMID: 32538250 DOI: 10.1080/14737159.2020.1782747] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
INTRODUCTION Osteoarthritis (OA) is a highly heterogenous disease influenced by different molecular, anatomic, and physiologic imbalances. Some of the bottlenecks for enhanced diagnosis and therapeutic assessment are the lack of validated biomarkers and early diagnosis tools. In this narrative review, we analyze the potential of Raman spectroscopy (RS) as a label-free optical tool for the characterization of articular joint tissues and its application as a diagnosis tool for OA. AREAS COVERED Raman spectra produce a unique 'molecular fingerprint' providing rotational and vibrational molecular information, allowing the identification and follow-up of molecular changes associated with OA pathological mechanisms. Focusing on multiple joint tissues (cartilage, synovium, bone, tendons, ligaments, and meniscus) and their contribution in disease incidence and progression, this review highlights the current knowledge on the application of RS in the characterization of organic and inorganic molecules present at these tissues and alterations that occur in the onset of OA. EXPERT OPINION Vibrational spectroscopy techniques, such as RS, are low cost, rapid and minimally invasive approaches that offer high specificity in the assessment of the molecular composition of complex tissues. Combined with multivariate statistical methods, RS offers great potential for optical biomarkers discovery or disease diagnosis applications, and we hereby discuss clinical translational progresses on the field.
Collapse
Affiliation(s)
- Paula Casal-Beiroa
- Unidad de Medicina Regenerativa, Grupo de Investigación en Reumatología, Instituto de Investigación Biomédica de A Coruña (INIBIC) ., A Coruña, Spain.,Centro de Investigaciones Científicas Avanzadas (CICA), Universidad de A Coruña (UDC) ,A Coruña, Spain
| | - Pío González
- New Materials Group, Department of Applied Physics, University of Vigo , Vigo, Spain
| | - Francisco J Blanco
- Unidad de Medicina Regenerativa, Grupo de Investigación en Reumatología, Instituto de Investigación Biomédica de A Coruña (INIBIC) ., A Coruña, Spain.,Centro de Investigaciones Científicas Avanzadas (CICA), Universidad de A Coruña (UDC) ,A Coruña, Spain
| | - Joana Magalhães
- Unidad de Medicina Regenerativa, Grupo de Investigación en Reumatología, Instituto de Investigación Biomédica de A Coruña (INIBIC) ., A Coruña, Spain.,Centro de Investigaciones Científicas Avanzadas (CICA), Universidad de A Coruña (UDC) ,A Coruña, Spain.,Centro de Investigación Biomédica en Red (CIBER) , Madrid, Spain
| |
Collapse
|
15
|
Ihnatouski M, Pauk J, Karev D, Karev B. AFM-Based Method for Measurement of Normal and Osteoarthritic Human Articular Cartilage Surface Roughness. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2302. [PMID: 32429426 PMCID: PMC7288191 DOI: 10.3390/ma13102302] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/09/2020] [Accepted: 05/13/2020] [Indexed: 12/23/2022]
Abstract
In osteoarthrosis, pathological features of articular cartilage are associated with degeneration and nanomechanical changes. The aim of this paper is to show that indentation-atomic force microscopy can monitor wear-related biomechanical changes in the hip joint of patients with osteoarthritis. Fifty patients (N = 50), aged 40 to 65, were included in the study. The mechanical properties and the submicron surface morphology of hyaline cartilage were investigated using atomic force microscopy. Measurements of the roughness parameters of cartilage surfaces were performed, including the arithmetic average of absolute values (Ra), the maximum peak height (Rp), and the mean spacing between local peaks (S). The arithmetic mean of the absolute values of the height of healthy cartilage was 86 nm, while wear began at Ra = 73 nm. The maximum changes of values of the roughness parameters differed from the healthy ones by 71%, 80%, and 51% for Ra, Rp, and S, respectively. Young's modulus for healthy cartilage surfaces ranged from 1.7 to 0.5 MPa. For the three stages of cartilage wear, Young's modulus increased, and then it approached the maximum value and decreased. AFM seems to be a powerful tool for surface analysis of biological samples as it enables indentation measurements in addition to imaging.
Collapse
Affiliation(s)
- Mikhail Ihnatouski
- Scientific and Research Department, Yanka Kupala State University of Grodno, Grodno, Ozheshko str., 22, 230023 Grodno, Belarus;
| | - Jolanta Pauk
- Biomedical Engineering Institute, Bialystok University of Technology, Wiejska 45A, 15-351 Bialystok, Poland
| | - Dmitrij Karev
- Department of Traumatology, Orthopedics and Field Surgery, Grodno State Medical University, Gorkogo str. 80, 230009 Grodno, Belarus;
| | - Boris Karev
- Department of Orthopedic and Traumatology, Grodno City Emergency Hospital, Sovietskih Pogranichnikov str., 115, 230027 Grodno, Belarus;
| |
Collapse
|
16
|
Early degeneration of the meniscus revealed by microbiomechanical alteration in a rabbit anterior cruciate ligament transection model. J Orthop Translat 2020; 21:146-152. [PMID: 32309140 PMCID: PMC7152828 DOI: 10.1016/j.jot.2019.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 05/21/2019] [Accepted: 06/03/2019] [Indexed: 02/07/2023] Open
Abstract
Background The microbiomechanical properties of the meniscus influence the cell response to the surrounding biomechanical environment and are beneficial to understand meniscus repairing and healing. To date, however, this information remains ambiguous. This study aims to characterise the microbiomechanical properties of the meniscus after degeneration in a rabbit anterior cruciate ligament transection (ACLT) model and to analyse the corresponding histology at the macroscale and chemical composition. Methods Twenty New Zealand white rabbits were used. Menisci were collected from the knee joints 4 and 8 weeks after the ACLT and from those of the corresponding control groups. The central portions of both medial and lateral menisci were investigated using atomic force microscopy, histological study, and an energy-dispersive spectrometer. The evaluation was conducted regionally within the inner, middle, and outer sites from the top layer (facing the femoral surface) to the bottom layer (facing the tibial surface) in both the lateral and medial menisci to obtain the site-dependent properties. Results At 4 weeks after surgery, the dynamic elastic modulus at the microlevel increased significantly at both the top and bottom layers compared with the intact meniscus (P = 0.021). At 8 weeks after surgery, the stiffening occurred in all regions (P = 0.030). The medial meniscus showed greater change than the lateral meniscus. All these microbiomechanical alterations occurred before the histological findings at the macroscale. Conclusion The microbiomechanical properties in the meniscus changed significantly after ACLT and were site dependent. Their alterations occurred before the histological changes of degeneration were observed. The Translational Potential of this Article The results of our study indicated that degeneration promoted meniscus stiffening. Thus, they provide a better understanding of the disease process affecting the meniscus. Our results might be beneficial to understand how mechanical forces distribute throughout the healthy and pathologic joint. They indicate the possibility of early diagnosis using a minimally invasive arthroscopic tool, as well as they might guide treatment to the healthy and pathologic meniscus and joint.
Collapse
|
17
|
Das P, Singh YP, Mandal BB, Nandi SK. Tissue-derived decellularized extracellular matrices toward cartilage repair and regeneration. Methods Cell Biol 2019; 157:185-221. [PMID: 32334715 DOI: 10.1016/bs.mcb.2019.11.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The inability of cartilage tissue to self-heal due to its avascular nature often leads to conditions such as osteoarthritis, traumatic rupture of cartilage, and osteochondrosis. The cartilage provides cushioning effects between the joints and avoids bone frictions. The extracellular matrix (ECM) of cartilage consists predominantly of collagens, elastin, proteoglycans and glycoproteins. A number of tissue engineered ECM derived biological scaffolds and matrices are available for cartilage regeneration. The decellularized tissues provide appropriate bioactive cues in the absence of cellular components, hence avoiding immunological issue. However, the decellularization process involves several cellular disruption techniques that may alter the ECM architecture affecting bioactivity. Therefore, development of cell-free cartilage biomaterials with unaltered ECM integrity and bioactivity is of paramount necessity by smart selection of modified techniques and agents. Herein, we described about various decellularization methods, agents, techniques, and their applications in tissue/cartilage decellularization. It also contemplates various difficulties and future perspectives to troubleshoot the existing obstructions in tissue-derived cartilage matrices and their applications.
Collapse
Affiliation(s)
- Piyali Das
- School of Bioscience and Engineering, Jadavpur University, Kolkata, West Bengal, India
| | - Yogendra Pratap Singh
- Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Biman B Mandal
- Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India; Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India.
| | - Samit Kumar Nandi
- Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences, Kolkata, West Bengal, India.
| |
Collapse
|
18
|
Maturation of the Meniscal Collagen Structure Revealed by Polarization-Resolved and Directional Second Harmonic Generation Microscopy. Sci Rep 2019; 9:18448. [PMID: 31804577 PMCID: PMC6895152 DOI: 10.1038/s41598-019-54942-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 11/12/2019] [Indexed: 11/08/2022] Open
Abstract
We report Polarization-resolved Second Harmonic Generation (P-SHG) and directional SHG (forward and backward, F/B) measurements of equine foetal and adult collagen in meniscus, over large field-of-views using sample-scanning. Large differences of collagen structure and fibril orientation with maturation are revealed, validating the potential for this novel methodology to track such changes in meniscal structure. The foetal menisci had a non-organized and more random collagen fibrillar structure when compared with adult using P-SHG. For the latter, clusters of homogeneous fibril orientation (inter-fibrillar areas) were revealed, separated by thick fibers. F/B SHG showed numerous different features in adults notably, in thick fibers compared to interfibrillar areas, unlike foetal menisci that showed similar patterns for both directions. This work confirms previous studies and improves the understanding of meniscal collagen structure and its maturation, and makes F/B and P-SHG good candidates for future studies aiming at revealing structural modifications to meniscus due to pathologies.
Collapse
|
19
|
Sharma S, Aguilera R, Rao J, Gimzewski JK. Piezoelectric needle sensor reveals mechanical heterogeneity in human thyroid tissue lesions. Sci Rep 2019; 9:9282. [PMID: 31243301 PMCID: PMC6594950 DOI: 10.1038/s41598-019-45730-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 06/10/2019] [Indexed: 12/15/2022] Open
Abstract
Palpable thyroid lesions are common, and although mostly benign, lethal malignant nodules do occur and may be difficult to differentiate. Here, we introduce the use of a piezoelectric system called Smart-touch fine needle (or STFN) mounted directly onto conventional biopsy needles, to evaluate abnormal tissues, through quantitative real-time measurements of variations in tissue stiffness as the needle penetrates tissue. Using well-characterized biomaterials of known stiffness and explanted animal tissue models, we first established experimental protocols for STFN measures on biological tissues, as well as optimized device design for high signal-to-noise ratio. Freshly excised patient thyroids with varying fibrotic and malignant potential revealed discrete variations in STFN based tissue stiffness/stiffness heterogeneity and correlated well with final histopathology. Our piezoelectric needle sensor reveals mechanical heterogeneity in thyroid tissue lesions and provides a foundation for the design of hand-held tools for the rapid, mechano-profiling of malignant lesions in vivo while performing fine needle aspiration (FNA).
Collapse
Affiliation(s)
- Shivani Sharma
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA, USA. .,California NanoSystems Institute, UCLA, Los Angeles, CA, USA. .,Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, USA. .,Clinical and Translational Science Institute, UCLA, Los Angeles, CA, USA.
| | - Renato Aguilera
- Department of Chemistry and Biochemistry, UCLA, Los Angeles, CA, USA
| | - JianYu Rao
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA, USA. .,California NanoSystems Institute, UCLA, Los Angeles, CA, USA. .,Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, USA. .,Clinical and Translational Science Institute, UCLA, Los Angeles, CA, USA.
| | - James K Gimzewski
- California NanoSystems Institute, UCLA, Los Angeles, CA, USA. .,Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, USA. .,Department of Chemistry and Biochemistry, UCLA, Los Angeles, CA, USA.
| |
Collapse
|
20
|
Cui SJ, Fu Y, Liu Y, Kou XX, Zhang JN, Gan YH, Zhou YH, Wang XD. Chronic inflammation deteriorates structure and function of collagen fibril in rat temporomandibular joint disc. Int J Oral Sci 2019; 11:2. [PMID: 30783108 PMCID: PMC6381164 DOI: 10.1038/s41368-018-0036-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 08/23/2018] [Accepted: 08/28/2018] [Indexed: 11/09/2022] Open
Abstract
Collagen is the building component of temporomandibular joint (TMJ) discs and is often affected by inflammation in temporomandibular disorders. The macromechanical properties of collagen are deteriorated by chronic inflammation. However, the mechanism by which inflammation influences disc function remains unknown. The relationship between the ultrastructure and nanomechanical properties of collagen in inflamed discs should be clarified. Seven-week-old female Sprague-Dawley rats were randomly divided into two groups. Chronic TMJ inflammation was induced by intra-articular injection of complete Freund's adjuvant, and samples were harvested after 5 weeks. Picrosirius staining revealed multiple colours under polarized light, which represented alternative collagen bundles in inflamed discs. Using atomic force microscopy scanning, the magnitude of Young's modulus was reduced significantly accompanied with disordered collagen fibril arrangement with porous architecture of inflamed discs. Transmission electron microscopy scanning revealed a non-uniform distribution of collagen fibres, and oversized collagen fibrils were observed in inflamed discs. Fourier transform infrared microspectroscopy revealed a decrease in 1 338 cm-1/amide II area ratio of collagen in different regions. The peak positions of amide I and amide II bands were altered in inflamed discs, indicating collagen unfolding. Our results suggest that sustained inflammation deteriorates collagen structures, resulting in the deterioration of the ultrastructure and nanomechanical properties of rat TMJ discs.
Collapse
Affiliation(s)
- Sheng-Jie Cui
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Yu Fu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Yan Liu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Xiao-Xing Kou
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Jie-Ni Zhang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Ye-Hua Gan
- Center for Temporomandibular Disorders and Orofacial Pain, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China
| | - Yan-Heng Zhou
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China. .,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.
| | - Xue-Dong Wang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China. .,Center for Craniofacial Stem Cell Research and Regeneration, Peking University School and Hospital of Stomatology, 22# Zhongguancun South Avenue, Haidian District, Beijing, China.
| |
Collapse
|
21
|
Jaffar J, Yang SH, Kim SY, Kim HW, Faiz A, Chrzanowski W, Burgess JK. Greater cellular stiffness in fibroblasts from patients with idiopathic pulmonary fibrosis. Am J Physiol Lung Cell Mol Physiol 2018. [PMID: 29516782 DOI: 10.1152/ajplung.00030.2018] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease involving degenerative breathing capacity. Fibrotic disease is driven by dysregulation in mechanical forces at the organ, tissue, and cellular level. While it is known that, in certain pathologies, diseased cells are stiffer than healthy cells, it is not known if fibroblasts derived from patients with IPF are stiffer than their normal counterparts. Using IPF patient-derived cell cultures, we measured the stiffness of individual lung fibroblasts via high-resolution force maps using atomic force microscopy. Fibroblasts from patients with IPF were stiffer and had an augmented cytoskeletal response to transforming growth factor-β1 compared with fibroblasts from donors without IPF. The results from this novel study indicate that the increased stiffness of lung fibroblasts of IPF patients may contribute to the increased rigidity of fibrotic lung tissue.
Collapse
Affiliation(s)
- Jade Jaffar
- Woolcock Institute of Medical Research, The University of Sydney, Sydney, Austrailia.,Department of Allergy, Immunology and Respiratory Medicine, The Alfred Hospital , Melbourne , Australia.,Department of Immunology and Pathology, Monash University , Melbourne , Australia
| | - Soung-Hee Yang
- Department of Nanobiomedical Science and Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea.,Institute of Tissue Regeneration Engineering and College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Sally Yunsun Kim
- Faculty of Pharmacy, The University of Sydney Nano Institute, The University of Sydney , Sydney , Australia
| | - Hae-Won Kim
- Department of Nanobiomedical Science and Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea.,Institute of Tissue Regeneration Engineering and College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Alen Faiz
- Woolcock Institute of Medical Research, The University of Sydney, Sydney, Austrailia.,The University of Groningen, University Medical Center Groningen, Department of Pathology and Medical Biology, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands.,The University of Groningen, University Medical Center Groningen, Department of Pulmonology, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands
| | - Wojciech Chrzanowski
- Department of Nanobiomedical Science and Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea.,Faculty of Pharmacy, The University of Sydney Nano Institute, The University of Sydney , Sydney , Australia
| | - Janette K Burgess
- Woolcock Institute of Medical Research, The University of Sydney, Sydney, Austrailia.,The University of Groningen, University Medical Center Groningen, Department of Pathology and Medical Biology, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands.,Discipline of Pharmacology, The University of Sydney , Sydney , Australia
| |
Collapse
|
22
|
Maturation State and Matrix Microstructure Regulate Interstitial Cell Migration in Dense Connective Tissues. Sci Rep 2018; 8:3295. [PMID: 29459687 PMCID: PMC5818574 DOI: 10.1038/s41598-018-21212-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 01/31/2018] [Indexed: 12/23/2022] Open
Abstract
Few regenerative approaches exist for the treatment of injuries to adult dense connective tissues. Compared to fetal tissues, adult connective tissues are hypocellular and show limited healing after injury. We hypothesized that robust repair can occur in fetal tissues with an immature extracellular matrix (ECM) that is conducive to cell migration, and that this process fails in adults due to the biophysical barriers imposed by the mature ECM. Using the knee meniscus as a platform, we evaluated the evolving micromechanics and microstructure of fetal and adult tissues, and interrogated the interstitial migratory capacity of adult meniscal cells through fetal and adult tissue microenvironments with or without partial enzymatic digestion. To integrate our findings, a computational model was implemented to determine how changing biophysical parameters impact cell migration through these dense networks. Our results show that the micromechanics and microstructure of the adult meniscus ECM sterically hinder cell mobility, and that modulation of these ECM attributes via an exogenous matrix-degrading enzyme permits migration through this otherwise impenetrable network. By addressing the inherent limitations to repair imposed by the mature ECM, these studies may define new clinical strategies to promote repair of damaged dense connective tissues in adults.
Collapse
|
23
|
Kotova SL, Timashev PS, Belkova GV, Kochueva MV, Babak KV, Timofeeva VA, Kiseleva EB, Vasilieva OO, Maslennikova AV, Solovieva AB. Early Effects of Ionizing Radiation on the Collagen Hierarchical Structure of Bladder and Rectum Visualized by Atomic Force Microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2018; 24:38-48. [PMID: 29485022 DOI: 10.1017/s1431927618000065] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Radiation therapy, widely used in the treatment of a variety of malignancies in the pelvic area, is associated with inevitable damage to the surrounding healthy tissues. We have applied atomic force microscopy (AFM) to track the early damaging effects of ionizing radiation on the collagen structures in the experimental animals' bladder and rectum. The first signs of the low-dose radiation (2 Gy) effect were detected by AFM as early as 1 week postirradiation. The observed changes were consistent with initial radiation destruction of the protein matrix. The alterations in the collagen fibers' packing 1 month postirradiation were indicative of the onset of fibrotic processes. The destructive effect of higher radiation doses was probed 1 day posttreatment. The severity of the radiation damage was proportional to the dose, from relatively minor changes in the collagen packing at 8 Gy to the growing collagen matrix destruction at higher doses and complete three-dimensional collagen network restructuring towards fibrotic-type architecture at the dose of 22 Gy. The AFM study appeared superior to the optical microscopy-based studies in its sensitivity to early radiation damage of tissues, providing valuable additional information on the onset and development of the collagen matrix destruction and remodeling.
Collapse
Affiliation(s)
- Svetlana L Kotova
- 1Department of Polymers and Composites,N.N.Semenov Institute of Chemical Physics,4 Kosygin St.,Moscow 119991,Russia
| | - Peter S Timashev
- 3Institute for Regenerative Medicine,I. M. Sechenov First Moscow State Medical University,8 Trubetskaya st.,Moscow 119991,Russia
| | - Galina V Belkova
- 1Department of Polymers and Composites,N.N.Semenov Institute of Chemical Physics,4 Kosygin St.,Moscow 119991,Russia
| | - Marina V Kochueva
- 5Nizhny Novgorod State Medical Academy,10/1 Minin and Pozharsky Sq.,Nizhny Novgorod 603005,Russia
| | - Ksenia V Babak
- 6N.I.Lobachevsky Nizhny Novgorod State University,23 Gagarin Ave.,Nizhny Novgorod 603950,Russia
| | - Victoria A Timofeeva
- 1Department of Polymers and Composites,N.N.Semenov Institute of Chemical Physics,4 Kosygin St.,Moscow 119991,Russia
| | - Elena B Kiseleva
- 5Nizhny Novgorod State Medical Academy,10/1 Minin and Pozharsky Sq.,Nizhny Novgorod 603005,Russia
| | - Olga O Vasilieva
- 1Department of Polymers and Composites,N.N.Semenov Institute of Chemical Physics,4 Kosygin St.,Moscow 119991,Russia
| | - Anna V Maslennikova
- 5Nizhny Novgorod State Medical Academy,10/1 Minin and Pozharsky Sq.,Nizhny Novgorod 603005,Russia
| | - Anna B Solovieva
- 1Department of Polymers and Composites,N.N.Semenov Institute of Chemical Physics,4 Kosygin St.,Moscow 119991,Russia
| |
Collapse
|
24
|
Wang L, Jang G, Ban DK, Sant V, Seth J, Kazmi S, Patel N, Yang Q, Lee J, Janetanakit W, Wang S, Head BP, Glinsky G, Lal R. Multifunctional stimuli responsive polymer-gated iron and gold-embedded silica nano golf balls: Nanoshuttles for targeted on-demand theranostics. Bone Res 2017; 5:17051. [PMID: 29285401 PMCID: PMC5737138 DOI: 10.1038/boneres.2017.51] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 09/06/2017] [Accepted: 09/10/2017] [Indexed: 11/13/2022] Open
Abstract
Multi-functional nanoshuttles for remotely targeted and on-demand delivery of therapeutic molecules and imaging to defined tissues and organs hold great potentials in personalized medicine, including precise early diagnosis, efficient prevention and therapy without toxicity. Yet, in spite of 25 years of research, there are still no such shuttles available. To this end, we have designed magnetic and gold nanoparticles (NP)-embedded silica nanoshuttles (MGNSs) with nanopores on their surface. Fluorescently labeled Doxorubicin (DOX), a cancer drug, was loaded in the MGNSs as a payload. DOX loaded MGNSs were encapsulated in heat and pH sensitive polymer P(NIPAM-co-MAA) to enable controlled release of the payload. Magnetically-guided transport of MGNSs was examined in: (a) a glass capillary tube to simulate their delivery via blood vessels; and (b) porous hydrogels to simulate their transport in composite human tissues, including bone, cartilage, tendon, muscles and blood-brain barrier (BBB). The viscoelastic properties of hydrogels were examined by atomic force microscopy (AFM). Cellular uptake of DOX-loaded MGNSs and the subsequent pH and temperature-mediated release were demonstrated in differentiated human neurons derived from induced pluripotent stem cells (iPSCs) as well as epithelial HeLa cells. The presence of embedded iron and gold NPs in silica shells and polymer-coating are supported by SEM and TEM. Fluorescence spectroscopy and microscopy documented DOX loading in the MGNSs. Time-dependent transport of MGNSs guided by an external magnetic field was observed in both glass capillary tubes and in the porous hydrogel. AFM results affirmed that the stiffness of the hydrogels model the rigidity range from soft tissues to bone. pH and temperature-dependent drug release analysis showed stimuli responsive and gradual drug release. Cells' viability MTT assays showed that MGNSs are non-toxic. The cell death from on-demand DOX release was observed in both neurons and epithelial cells even though the drug release efficiency was higher in neurons. Therefore, development of smart nanoshuttles have significant translational potential for controlled delivery of theranostics' payloads and precisely guided transport in specified tissues and organs (for example, bone, cartilage, tendon, bone marrow, heart, lung, liver, kidney, and brain) for highly efficient personalized medicine applications.
Collapse
Affiliation(s)
- Liping Wang
- School of Biomedical Engineering, Shanghai Jiaotong Univerity, Shanghai, China
| | - Grace Jang
- Department of Mechanical and Aerospace Engineering, La Jolla, CA, USA
| | | | - Vrinda Sant
- Materials Science and Engineering Program, La Jolla, CA, USA
| | - Jay Seth
- Department of Nanoengineering, La Jolla, CA, USA
| | - Sami Kazmi
- Department of Chemical Engineering University of California, San Diego, La Jolla, CA, USA
| | - Nirav Patel
- Department of Bioengineering, La Jolla, CA, USA
| | - Qingqing Yang
- Materials Science and Engineering Program, La Jolla, CA, USA
| | - Joon Lee
- Materials Science and Engineering Program, La Jolla, CA, USA
| | | | - Shanshan Wang
- Department of Anesthesiology, La Jolla, CA, USA
- Veterans Affairs San Diego Healthcare System, San Diego, CA, USA
| | - Brian P Head
- Department of Anesthesiology, La Jolla, CA, USA
- Veterans Affairs San Diego Healthcare System, San Diego, CA, USA
| | | | - Ratneshwar Lal
- Department of Mechanical and Aerospace Engineering, La Jolla, CA, USA
- Materials Science and Engineering Program, La Jolla, CA, USA
- Department of Bioengineering, La Jolla, CA, USA
| |
Collapse
|
25
|
Bajpayee AG, De la Vega RE, Scheu M, Varady NH, Yannatos IA, Brown LA, Krishnan Y, Fitzsimons TJ, Bhattacharya P, Frank EH, Grodzinsky AJ, Porter RM. Sustained intra-cartilage delivery of low dose dexamethasone using a cationic carrier for treatment of post traumatic osteoarthritis. Eur Cell Mater 2017; 34:341-364. [PMID: 29205258 PMCID: PMC5744663 DOI: 10.22203/ecm.v034a21] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Disease-modifying osteoarthritis drugs (DMOADs) should reach their intra-tissue target sites at optimal doses for clinical efficacy. The dense, negatively charged matrix of cartilage poses a major hindrance to the transport of potential therapeutics. In this work, electrostatic interactions were utilised to overcome this challenge and enable higher uptake, full-thickness penetration and enhanced retention of dexamethasone (Dex) inside rabbit cartilage. This was accomplished by using the positively charged glycoprotein avidin as nanocarrier, conjugated to Dex by releasable linkers. Therapeutic effects of a single intra-articular injection of low dose avidin-Dex (0.5 mg Dex) were evaluated in rabbits 3 weeks after anterior cruciate ligament transection (ACLT). Immunostaining confirmed that avidin penetrated the full cartilage thickness and was retained for at least 3 weeks. Avidin-Dex suppressed injury-induced joint swelling and catabolic gene expression to a greater extent than free Dex. It also significantly improved the histological score of cell infiltration and morphogenesis within the periarticular synovium. Micro-computed tomography confirmed the reduced incidence and volume of osteophytes following avidin-Dex treatment. However, neither treatment restored the loss of cartilage stiffness following ACLT, suggesting the need for a combinational therapy with a pro-anabolic factor for enhancing matrix biosynthesis. The avidin dose used caused significant glycosaminoglycan (GAG) loss, suggesting the use of higher Dex : avidin ratios in future formulations, such that the delivered avidin dose could be much less than that shown to affect GAGs. This charge-based delivery system converted cartilage into a drug depot that could also be employed for delivery to nearby synovium, menisci and ligaments, enabling clinical translation of a variety of DMOADs.
Collapse
Affiliation(s)
- Ambika G. Bajpayee
- Departments of Bioengineering and Mechanical Engineering, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA,Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Rodolfo E. De la Vega
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Centre (BIDMC), Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA,Current affiliation: Rehabilitation Medicine Research Centre, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Maximiliano Scheu
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Centre (BIDMC), Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA,Department of Orthopaedic Surgery, Clínica Alemana de Santiago, Avenida Vitacura 5951, Vitacura, Chile
| | - Nathan H. Varady
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Isabel A. Yannatos
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Lennart A. Brown
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Centre (BIDMC), Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Yamini Krishnan
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Tomas J. Fitzsimons
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Centre (BIDMC), Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Paulomi Bhattacharya
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Eliot H. Frank
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Alan J. Grodzinsky
- Centre for Biomedical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA,Departments of Biological, Mechanical and Electrical Engineering, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Ryan M. Porter
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Centre (BIDMC), Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA,Address for correspondence: Ryan M. Porter, University of Arkansas for Medical Sciences, Division of Endocrinology and Metabolism, 4301 W. Markham Street, Mail Slot #587, Little Rock, AR 72205, Telephone : +1 5015266990,
| |
Collapse
|
26
|
Han B, Nia HT, Wang C, Chandrasekaran P, Li Q, Chery DR, Li H, Grodzinsky AJ, Han L. AFM-Nanomechanical Test: An Interdisciplinary Tool That Links the Understanding of Cartilage and Meniscus Biomechanics, Osteoarthritis Degeneration, and Tissue Engineering. ACS Biomater Sci Eng 2017; 3:2033-2049. [PMID: 31423463 PMCID: PMC6697429 DOI: 10.1021/acsbiomaterials.7b00307] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Our objective is to provide an in-depth review of the recent technical advances of atomic force microscopy (AFM)-based nanomechanical tests and their contribution to a better understanding and diagnosis of osteoarthritis (OA), as well as the repair of tissues undergoing degeneration during OA progression. We first summarize a range of technical approaches for AFM-based nanoindentation, including considerations in both experimental design and data analysis. We then provide a more detailed description of two recently developed modes of AFM-nanoindentation, a high-bandwidth nanorheometer system for studying poroviscoelasticity and an immunofluorescence-guided nanomechanical mapping technique for delineating the pericellular matrix (PCM) and territorial/interterritorial matrix (T/IT-ECM) of surrounding cells in connective tissues. Next, we summarize recent applications of these approaches to three aspects of joint-related healthcare and disease: cartilage aging and OA, developmental biology and OA pathogenesis in murine models, and nanomechanics of the meniscus. These studies were performed over a hierarchy of length scales, from the molecular, cellular to the whole tissue level. The advances described here have contributed greatly to advancing the fundamental knowledge base for improved understanding, detection, and treatment of OA.
Collapse
Affiliation(s)
- Biao Han
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Hadi T. Nia
- Department of Radiation Oncology, Massachusetts General Hospital Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Chao Wang
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Prashant Chandrasekaran
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Qing Li
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Daphney R. Chery
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Hao Li
- College of Architecture and the Built Environment, Philadelphia University, Philadelphia, Pennsylvania 19144, United States
| | - Alan J. Grodzinsky
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Lin Han
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
27
|
Li Q, Qu F, Han B, Wang C, Li H, Mauck RL, Han L. Micromechanical anisotropy and heterogeneity of the meniscus extracellular matrix. Acta Biomater 2017; 54:356-366. [PMID: 28242455 PMCID: PMC5413404 DOI: 10.1016/j.actbio.2017.02.043] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 02/22/2017] [Accepted: 02/23/2017] [Indexed: 02/07/2023]
Abstract
To understand how the complex biomechanical functions of the meniscus are endowed by the nanostructure of its extracellular matrix (ECM), we studied the anisotropy and heterogeneity in the micromechanical properties of the meniscus ECM. We used atomic force microscopy (AFM) to quantify the time-dependent mechanical properties of juvenile bovine meniscus at deformation length scales corresponding to the diameters of collagen fibrils. At this scale, anisotropy in the elastic modulus of the circumferential fibers, the major ECM structural unit, can be attributed to differences in fibril deformation modes: uncrimping when normal to the fiber axis, and laterally constrained compression when parallel to the fiber axis. Heterogeneity among different structural units is mainly associated with their variations in microscale fiber orientation, while heterogeneity across anatomical zones is due to alterations in collagen fibril diameter and alignment at the nanoscale. Unlike the elastic modulus, the time-dependent properties are more homogeneous and isotropic throughout the ECM. These results enable a detailed understanding of the meniscus structure-mechanics at the nanoscale, and can serve as a benchmark for understanding meniscus biomechanical functions, documenting disease progression and designing tissue repair strategies. STATEMENT OF SIGNIFICANCE Meniscal damage is a common cause of joint injury, which can lead to the development of post-traumatic osteoarthritis among young adults. Restoration of meniscus function requires repairing its highly heterogeneous and complex extracellular matrix. Employing AFM, this study quantifies the anisotropic and heterogeneous features of the meniscus ECM structure and mechanics. The micromechanical properties are interpreted within the context of the collagen fibril nanostructure and its variation with tissue anatomical locations. These results provide a fundamental structure-mechanics knowledge benchmark, against which, repair and regeneration strategies can be developed and evaluated with respect to the specialized structural and functional complexity of the native tissue.
Collapse
Affiliation(s)
- Qing Li
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, United States
| | - Feini Qu
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States; Translational Musculoskeletal Research Center, Philadelphia Veterans Administration Medical Center, Philadelphia, PA 19104, United States
| | - Biao Han
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, United States
| | - Chao Wang
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, United States
| | - Hao Li
- College of Architecture and the Built Environment, Philadelphia University, Philadelphia, PA 19144, United States
| | - Robert L Mauck
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States; Translational Musculoskeletal Research Center, Philadelphia Veterans Administration Medical Center, Philadelphia, PA 19104, United States
| | - Lin Han
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, United States.
| |
Collapse
|
28
|
Kawecki M, Łabuś W, Klama-Baryla A, Kitala D, Kraut M, Glik J, Misiuga M, Nowak M, Bielecki T, Kasperczyk A. A review of decellurization methods caused by an urgent need for quality control of cell-free extracellular matrix' scaffolds and their role in regenerative medicine. J Biomed Mater Res B Appl Biomater 2017; 106:909-923. [DOI: 10.1002/jbm.b.33865] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 10/12/2016] [Accepted: 01/26/2017] [Indexed: 12/30/2022]
Affiliation(s)
- Marek Kawecki
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
- University of Technology and Humanities in Bielsko-Biała; Department of Health Science in Bielsko-Biała; Poland
| | - Wojciech Łabuś
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
| | | | - Diana Kitala
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
| | - Malgorzata Kraut
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
| | - Justyna Glik
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
- The Medical University of Silesia in Katowice; Unit for Chronic Wound Treatment Organization, Nursery Division; School of Healthcare in Zabrze Poland
| | - Marcelina Misiuga
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
| | - Mariusz Nowak
- Dr Stanislaw Sakiel Centre for Burns Treatment in Siemianowice Slaskie; Poland
| | - Tomasz Bielecki
- Saint Barbara's Clinical Hospital number 5 in Sosnowiec; Clinical Department of Orthopaedics, Trauma; Oncologic and Reconstructive Surgery Poland
| | - Aleksandra Kasperczyk
- Medical University of Silesia in Katowice; Department of Biochemistry, School of Medicine with the Division of Dentistry in Zabrze
| |
Collapse
|
29
|
Chen D, Shen J, Zhao W, Wang T, Han L, Hamilton JL, Im HJ. Osteoarthritis: toward a comprehensive understanding of pathological mechanism. Bone Res 2017; 5:16044. [PMID: 28149655 PMCID: PMC5240031 DOI: 10.1038/boneres.2016.44] [Citation(s) in RCA: 648] [Impact Index Per Article: 92.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/02/2016] [Accepted: 09/08/2016] [Indexed: 12/14/2022] Open
Abstract
Osteoarthritis (OA) is the most common degenerative joint disease and a major cause of pain and disability in adult individuals. The etiology of OA includes joint injury, obesity, aging, and heredity. However, the detailed molecular mechanisms of OA initiation and progression remain poorly understood and, currently, there are no interventions available to restore degraded cartilage or decelerate disease progression. The diathrodial joint is a complicated organ and its function is to bear weight, perform physical activity and exhibit a joint-specific range of motion during movement. During OA development, the entire joint organ is affected, including articular cartilage, subchondral bone, synovial tissue and meniscus. A full understanding of the pathological mechanism of OA development relies on the discovery of the interplaying mechanisms among different OA symptoms, including articular cartilage degradation, osteophyte formation, subchondral sclerosis and synovial hyperplasia, and the signaling pathway(s) controlling these pathological processes.
Collapse
Affiliation(s)
- Di Chen
- Department of Biochemistry, Rush University Medical Center, Chicago, IL, USA
| | - Jie Shen
- Department of Orthopaedic Surgery, Washington University, St Louis, MO, USA
| | - Weiwei Zhao
- Department of Biochemistry, Rush University Medical Center, Chicago, IL, USA
- Department of Orthopaedics & Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Tingyu Wang
- Department of Pharmacy, Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Lin Han
- School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, PA, USA
| | - John L Hamilton
- Department of Biochemistry, Rush University Medical Center, Chicago, IL, USA
| | - Hee-Jeong Im
- Department of Biochemistry, Rush University Medical Center, Chicago, IL, USA
| |
Collapse
|
30
|
Osteoarthritis year in review 2015: mechanics. Osteoarthritis Cartilage 2016; 24:27-35. [PMID: 26707990 PMCID: PMC4693146 DOI: 10.1016/j.joca.2015.08.018] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 08/13/2015] [Accepted: 08/29/2015] [Indexed: 02/02/2023]
Abstract
Motivated by the conceptual framework of multi-scale biomechanics, this narrative review highlights recent major advances with a focus on gait and joint kinematics, then tissue-level mechanics, cell mechanics and mechanotransduction, matrix mechanics, and finally the nanoscale mechanics of matrix macromolecules. A literature review was conducted from January 2014 to April 2015 using PubMed to identify major developments in mechanics related to osteoarthritis (OA). Studies of knee adduction, flexion, rotation, and contact mechanics have extended our understanding of medial compartment loading. In turn, advances in measurement methodologies have shown how injuries to both the meniscus and ligaments, together, can alter joint kinematics. At the tissue scale, novel findings have emerged regarding the mechanics of the meniscus as well as cartilage superficial zone. Moving to the cell level, poroelastic and poro-viscoelastic mechanisms underlying chondrocyte deformation have been reported, along with the response to osmotic stress. Further developments have emerged on the role of calcium signaling in chondrocyte mechanobiology, including exciting findings on the function of mechanically activated cation channels newly found to be expressed in chondrocytes. Finally, AFM-based nano-rheology systems have enabled studies of thin murine tissues and brush layers of matrix molecules over a wide range of loading rates including high rates corresponding to impact injury. With OA acknowledged to be a disease of the joint as an organ, understanding mechanical behavior at each length scale helps to elucidate the connections between cell biology, matrix biochemistry and tissue structure/function that may play a role in the pathomechanics of OA.
Collapse
|
31
|
Kilpatrick JI, Revenko I, Rodriguez BJ. Nanomechanics of Cells and Biomaterials Studied by Atomic Force Microscopy. Adv Healthc Mater 2015. [PMID: 26200464 DOI: 10.1002/adhm.201500229] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The behavior and mechanical properties of cells are strongly dependent on the biochemical and biomechanical properties of their microenvironment. Thus, understanding the mechanical properties of cells, extracellular matrices, and biomaterials is key to understanding cell function and to develop new materials with tailored mechanical properties for tissue engineering and regenerative medicine applications. Atomic force microscopy (AFM) has emerged as an indispensable technique for measuring the mechanical properties of biomaterials and cells with high spatial resolution and force sensitivity within physiologically relevant environments and timescales in the kPa to GPa elastic modulus range. The growing interest in this field of bionanomechanics has been accompanied by an expanding array of models to describe the complexity of indentation of hierarchical biological samples. Furthermore, the integration of AFM with optical microscopy techniques has further opened the door to a wide range of mechanotransduction studies. In recent years, new multidimensional and multiharmonic AFM approaches for mapping mechanical properties have been developed, which allow the rapid determination of, for example, cell elasticity. This Progress Report provides an introduction and practical guide to making AFM-based nanomechanical measurements of cells and surfaces for tissue engineering applications.
Collapse
Affiliation(s)
- Jason I. Kilpatrick
- Conway Institute of Biomolecular and Biomedical Research; University College Dublin; Belfield Dublin 4 Ireland
| | - Irène Revenko
- Asylum Research an Oxford Instruments Company; 6310 Hollister Avenue Santa Barbara CA 93117 USA
| | - Brian J. Rodriguez
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin; Belfield, Dublin 4, Ireland; School of Physics; University College Dublin; Belfield Dublin 4 Ireland
| |
Collapse
|
32
|
Levillain A, Boulocher C, Kaderli S, Viguier E, Hannouche D, Hoc T, Magoariec H. Meniscal biomechanical alterations in an ACLT rabbit model of early osteoarthritis. Osteoarthritis Cartilage 2015; 23:1186-93. [PMID: 25725391 DOI: 10.1016/j.joca.2015.02.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 02/11/2015] [Accepted: 02/18/2015] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The purpose of this study was to analyze the early biomechanical alterations of menisci during the early stage of osteoarthritis (OA) development and to correlate them with the chemical composition and matrix alteration. A particular focus was paid to pathological changes in glycosaminoglycan (GAG) content and collagen fiber architecture. DESIGN Menisci (n = 24) were removed from rabbits' knee joints 6 weeks following surgical anterior cruciate ligament transection (ACLT). Both the anterior and posterior regions of medial and lateral menisci were characterized using indentation tests, Raman microspectroscopy (RM), biphotonic confocal microscopy (BCM) and histology. RESULTS Mechanical and matrix alterations occurred in both regions of medial and lateral menisci. A significant decrease in the mechanical properties was observed in OA menisci, with a mean reduced modulus from 2.3 to 1.1 MPa. Microstructural observations revealed less organized and less compact collagen bundles in operated menisci than in contralateral menisci, as well as a loss of fiber tension. GAG content was increased in OA menisci, especially in the damaged areas. Neither changes in the secondary structure of collagen nor mineralization were detected through RM at this stage of OA. CONCLUSION ACLT led to a disorganization of the collagen framework at the early stage of OA development, which decreases the mechanical resistance of the menisci. GAG content increases in response to this degradation. All of these results demonstrate the strong correlation between matrix and mechanical alterations.
Collapse
Affiliation(s)
- A Levillain
- LTDS, UMR CNRS 5513, Université de Lyon, Ecole centrale de Lyon, 36 av Guy de Collongue, 69134 Ecully Cedex, France
| | - C Boulocher
- Research Unit ICE, UPSP 2011.03.101, Université de Lyon, Veterinary Campus of VetAgro Sup, 69 280 Marcy l'Etoile, France
| | - S Kaderli
- School of Pharmaceutical Sciences, University of Geneva and Lausanne, Quai Ernest-Ansermet 30, 1211 Geneva, Switzerland
| | - E Viguier
- Research Unit ICE, UPSP 2011.03.101, Université de Lyon, Veterinary Campus of VetAgro Sup, 69 280 Marcy l'Etoile, France
| | - D Hannouche
- B2OA, UMR CNRS 7052 CHU Lariboisière Saint Louis, 10 av de Verdun, 75020 Paris France
| | - T Hoc
- LTDS, UMR CNRS 5513, Université de Lyon, Ecole centrale de Lyon, 36 av Guy de Collongue, 69134 Ecully Cedex, France.
| | - H Magoariec
- LTDS, UMR CNRS 5513, Université de Lyon, Ecole centrale de Lyon, 36 av Guy de Collongue, 69134 Ecully Cedex, France
| |
Collapse
|
33
|
Higher strains in the inner region of the meniscus indicate a potential source for degeneration. J Biomech 2015; 48:1377-82. [DOI: 10.1016/j.jbiomech.2015.02.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 02/28/2015] [Indexed: 11/18/2022]
|