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Zhu T, Alves SM, Adamo A, Wen X, Corn KC, Shostak A, Johnson S, Shaub ND, Martello SE, Hacker BC, D'Amore A, Bardhan R, Rafat M. Mammary tissue-derived extracellular matrix hydrogels reveal the role of irradiation in driving a pro-tumor and immunosuppressive microenvironment. Biomaterials 2024; 308:122531. [PMID: 38531198 PMCID: PMC11065579 DOI: 10.1016/j.biomaterials.2024.122531] [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: 12/18/2023] [Revised: 03/03/2024] [Accepted: 03/08/2024] [Indexed: 03/28/2024]
Abstract
Radiation therapy (RT) is essential for triple negative breast cancer (TNBC) treatment. However, patients with TNBC continue to experience recurrence after RT. The role of the extracellular matrix (ECM) of irradiated breast tissue in tumor recurrence is still unknown. In this study, we evaluated the structure, molecular composition, and mechanical properties of irradiated murine mammary fat pads (MFPs) and developed ECM hydrogels from decellularized tissues (dECM) to assess the effects of RT-induced ECM changes on breast cancer cell behavior. Irradiated MFPs were characterized by increased ECM deposition and fiber density compared to unirradiated controls, which may provide a platform for cell invasion and proliferation. ECM component changes in collagens I, IV, and VI, and fibronectin were observed following irradiation in both MFPs and dECM hydrogels. Encapsulated TNBC cell proliferation and invasive capacity was enhanced in irradiated dECM hydrogels. In addition, TNBC cells co-cultured with macrophages in irradiated dECM hydrogels induced M2 macrophage polarization and exhibited further increases in proliferation. Our study establishes that the ECM in radiation-damaged sites promotes TNBC invasion and proliferation as well as an immunosuppressive microenvironment. This work represents an important step toward elucidating how changes in the ECM after RT contribute to breast cancer recurrence.
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Affiliation(s)
- Tian Zhu
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Steven M Alves
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Arianna Adamo
- Ri.MED Foundation, Palermo, Italy; McGowan Institute for Regenerative Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Xiaona Wen
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Kevin C Corn
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Anastasia Shostak
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | | | - Nicholas D Shaub
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Shannon E Martello
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Benjamin C Hacker
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Antonio D'Amore
- Ri.MED Foundation, Palermo, Italy; McGowan Institute for Regenerative Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Rizia Bardhan
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, USA; Nanovaccine Institute, Iowa State University, Ames, IA, USA
| | - Marjan Rafat
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA; Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA; Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN, USA.
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2
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Kumar S, Acharya TK, Kumar S, Rokade TP, Das NK, Chawla S, Goswami L, Goswami C. TRPV4 Activator-Containing CMT-Hy Hydrogel Enhances Bone Tissue Regeneration In Vivo by Enhancing Mitochondrial Health. ACS Biomater Sci Eng 2024; 10:2367-2384. [PMID: 38470969 DOI: 10.1021/acsbiomaterials.3c01304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
Treating different types of bone defects is difficult, complicated, time-consuming, and expensive. Here, we demonstrate that transient receptor potential cation channel subfamily V member 4 (TRPV4), a mechanosensitive, thermogated, and nonselective cation channel, is endogenously present in the mesenchymal stem cells (MSCs). TRPV4 regulates both cytosolic Ca2+ levels and mitochondrial health. Accordingly, the hydrogel made from a natural modified biopolymer carboxymethyl tamarind CMT-Hy and encapsulated with TRPV4-modulatory agents affects different parameters of MSCs, such as cell morphology, focal adhesion points, intracellular Ca2+, and reactive oxygen species- and NO-levels. TRPV4 also regulates cell differentiation and biomineralization in vitro. We demonstrate that 4α-10-CMT-Hy and 4α-50-CMT-Hy (the hydrogel encapsulated with 4αPDD, 10 and 50 nM, TRPV4 activator) surfaces upregulate mitochondrial health, i.e., an increase in ATP- and cardiolipin-levels, and improve the mitochondrial membrane potential. The same scaffold turned out to be nontoxic in vivo. 4α-50-CMT-Hy enhances the repair of the bone-drill hole in rat femur, both qualitatively and quantitatively in vivo. We conclude that 4α-50-CMT-Hy as a scaffold is suitable for treating large-scale bone defects at low cost and can be tested for clinical trials.
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Affiliation(s)
- Satish Kumar
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
| | - Tusar K Acharya
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
| | - Shamit Kumar
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
| | - Tejas P Rokade
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
| | - Nilesh K Das
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
| | - Saurabh Chawla
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
| | - Luna Goswami
- School of Biotechnology, KIIT Deemed to be University, Patia, Bhubaneswar 751024, India
- School of Chemical Technology, KIIT Deemed to be University, Patia, Bhubaneswar 751024, India
| | - Chandan Goswami
- School of Biological Sciences, National Institute of Science Education and Research, HBNI, Khordha, Jatni 752050, Odisha, India
- Centre for Interdisciplinary Sciences, National Institute of Science Education and Research, Khordha, Jatni 752050, Odisha, India
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3
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Shanbhag S, Kampleitner C, Al-Sharabi N, Mohamed-Ahmed S, Apaza Alccayhuaman KA, Heimel P, Tangl S, Beinlich A, Rana N, Sanz M, Kristoffersen EK, Mustafa K, Gruber R. Functionalizing Collagen Membranes with MSC-Conditioned Media Promotes Guided Bone Regeneration in Rat Calvarial Defects. Cells 2023; 12:cells12050767. [PMID: 36899904 PMCID: PMC10001262 DOI: 10.3390/cells12050767] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 03/04/2023] Open
Abstract
Functionalizing biomaterials with conditioned media (CM) from mesenchymal stromal cells (MSC) is a promising strategy for enhancing the outcomes of guided bone regeneration (GBR). This study aimed to evaluate the bone regenerative potential of collagen membranes (MEM) functionalized with CM from human bone marrow MSC (MEM-CM) in critical size rat calvarial defects. MEM-CM prepared via soaking (CM-SOAK) or soaking followed by lyophilization (CM-LYO) were applied to critical size rat calvarial defects. Control treatments included native MEM, MEM with rat MSC (CEL) and no treatment. New bone formation was analyzed via micro-CT (2 and 4 weeks) and histology (4 weeks). Greater radiographic new bone formation occurred at 2 weeks in the CM-LYO group vs. all other groups. After 4 weeks, only the CM-LYO group was superior to the untreated control group, whereas the CM-SOAK, CEL and native MEM groups were similar. Histologically, the regenerated tissues showed a combination of regular new bone and hybrid new bone, which formed within the membrane compartment and was characterized by the incorporation of mineralized MEM fibers. Areas of new bone formation and MEM mineralization were greatest in the CM-LYO group. Proteomic analysis of lyophilized CM revealed the enrichment of several proteins and biological processes related to bone formation. In summary, lyophilized MEM-CM enhanced new bone formation in rat calvarial defects, thus representing a novel 'off-the-shelf' strategy for GBR.
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Affiliation(s)
- Siddharth Shanbhag
- Department of Immunology and Transfusion Medicine, Haukeland University Hospital, 5021 Bergen, Norway
- Center for Translational Oral Research (TOR), Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, 5009 Bergen, Norway
- Correspondence: (S.S.); (R.G.); Tel.: +47-55586059 (S.S.); +43-(0)69910718472 (R.G.)
| | - Carina Kampleitner
- Karl Donath Laboratory for Hard Tissue and Biomaterial Research, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Niyaz Al-Sharabi
- Center for Translational Oral Research (TOR), Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, 5009 Bergen, Norway
| | - Samih Mohamed-Ahmed
- Center for Translational Oral Research (TOR), Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, 5009 Bergen, Norway
| | | | - Patrick Heimel
- Karl Donath Laboratory for Hard Tissue and Biomaterial Research, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Stefan Tangl
- Karl Donath Laboratory for Hard Tissue and Biomaterial Research, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Andreas Beinlich
- Department of Earth Science, Faculty of Mathematics and Natural Sciences, University of Bergen, 5009 Bergen, Norway
| | - Neha Rana
- Center for Translational Oral Research (TOR), Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, 5009 Bergen, Norway
| | - Mariano Sanz
- ETEP Research Group, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, Spain
| | - Einar K. Kristoffersen
- Department of Immunology and Transfusion Medicine, Haukeland University Hospital, 5021 Bergen, Norway
| | - Kamal Mustafa
- Center for Translational Oral Research (TOR), Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, 5009 Bergen, Norway
| | - Reinhard Gruber
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria
- Department of Periodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland
- Correspondence: (S.S.); (R.G.); Tel.: +47-55586059 (S.S.); +43-(0)69910718472 (R.G.)
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4
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Reddy Padala S, Saikia D, Mikkonen JJW, Uurasjärvi E, Dekker H, Schulten EAJM, Bravenboer N, Koistinen A, Chauhan A, Singh SP, Kullaa AM. Irradiation Induced Biochemical Changes in Human Mandibular Bone: A Raman Spectroscopic Study. APPLIED SPECTROSCOPY 2022; 76:1165-1173. [PMID: 35684992 DOI: 10.1177/00037028221109244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the biochemical changes in irradiated human mandible after radiotherapy of cancer patients is critical for oral rehabilitation. The underlying mechanism for radiation-associated changes in the bone at the molecular level could lead to implant failure and osteoradionecrosis. The study aimed to assess the chemical composition and bone quality in irradiated human mandibular bone using Raman spectroscopy. A total of 33 bone biopsies from 16 control and 17 irradiated patients were included to quantify different biochemical parameters from the Raman spectra. The differences in bone mineral and matrix band intensities between control and irradiated groups were analyzed using unpaired Student's t-test with statistical significance at p < 0.05. Findings suggest that the intensity of the phosphate band is significantly decreased and the carbonate band is significantly increased in the irradiated group. Further, the mineral crystallinity and carbonate to phosphate ratio are increased. The mineral to matrix ratio is decreased in the irradiated group. Principal component analysis (PCA) based on the local radiation dose and biopsy time interval of irradiated samples did not show any specific classification between irradiation sub-groups. Irradiation disrupted the interaction and bonding between the organic matrix and hydroxyapatite minerals affecting the bone biochemical properties. However, the normal clinical appearance of irradiated bone would have been accompanied by underlying biochemical and microscopical changes which might result in radiation-induced delayed complications.
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Affiliation(s)
| | - Dimple Saikia
- Department of Bio-Sciences and Bio-Engineering, 477529Indian Institute of Technology, Dharwad, India
| | - Jopi J W Mikkonen
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
- SIB Labs, University of Eastern Finland, Kuopio, Finland
| | | | - Hannah Dekker
- Department of Oral and Maxillofacial Surgery/Oral Pathology, Amsterdam UMC and Academic Centre for Dentistry Amsterdam (ACTA), Vrije Universiteit Amsterdam, De Boelelaan, The Netherlands
| | - Engelbert A J M Schulten
- Department of Oral and Maxillofacial Surgery/Oral Pathology, Amsterdam UMC and Academic Centre for Dentistry Amsterdam (ACTA), Vrije Universiteit Amsterdam, De Boelelaan, The Netherlands
| | - Nathalie Bravenboer
- Department of Clinical Chemistry, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan, The Netherlands
- Department of Internal Medicine, Division of Endocrinology and Center for Bone Quality, 4501Leiden University Medical Center, Leiden, The Netherlands
| | - Arto Koistinen
- SIB Labs, University of Eastern Finland, Kuopio, Finland
| | - Amrita Chauhan
- Department of Bio-Sciences and Bio-Engineering, 477529Indian Institute of Technology, Dharwad, India
| | - Surya P Singh
- Department of Bio-Sciences and Bio-Engineering, 477529Indian Institute of Technology, Dharwad, India
| | - Arja M Kullaa
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
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5
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John P, Antony IR, Whenish R, Jinoop AN. A review on fabrication of 3D printed biomaterials using optical methodologies for tissue engineering applications. Proc Inst Mech Eng H 2022; 236:1583-1594. [DOI: 10.1177/09544119221122856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Human body comprises of different internal and external biological components. Human organs tend to fail due to continuous or sudden stress which leads to deterioration, failure, and dislocation. The choice of selection and fabrication of materials for tissue engineering play a key role in terms of suitability, sensitivity, and functioning with other organs as a replacement for failed organs. The progressive improvement of the additive manufacturing (AM) approach in healthcare made it possible to print multi-material and customized complex/intricate geometries in a layer-by-layer fashion. The customized or patient-specific implant fabrication can be easily produced with a high success rate due to the development of AM technologies with tailorable properties. The structural behavior of 3D printed biomaterials is a crucial factor in tissue engineering as they affect the functionality of the implants. Various techniques have been developed in appraising the important features and the effects of the subsequent design of the biomaterial implants. The behavior of the AM built biomaterial implants can be understood visually by an imaging system with a high spatial and spectral resolution. This review intends to present an overview of various biomaterials used in implants, followed by a detailed description of optical 3D printing procedures and evaluation of the performance of 3D printed biomaterials using optical characterization.
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Affiliation(s)
- Pauline John
- Department of Biomedical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, TN, India
| | - Irene Rose Antony
- School of Bio-sciences and Technology, Vellore Institute of Technology, Vellore, TN, India
| | - Ruban Whenish
- Center for Biomaterials, Cellular and molecular Theranostics, Vellore Institute of Technology, Vellore, TN, India
| | - Arackal Narayanan Jinoop
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada
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6
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Dubus M, Scomazzon L, Ledouble C, Braux J, Beljebbar A, Van Gulick L, Baldit A, Gorin C, Alem H, Bouland N, Britton M, Schiavi J, Vaughan TJ, Mauprivez C, Kerdjoudj H. Hybrid Mineral/Organic Material Induces Bone Bridging and Bone Volume Augmentation in Rat Calvarial Critical Size Defects. Cells 2022; 11:cells11182865. [PMID: 36139439 PMCID: PMC9497222 DOI: 10.3390/cells11182865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 09/04/2022] [Accepted: 09/06/2022] [Indexed: 11/22/2022] Open
Abstract
In craniofacial bone defects, the promotion of bone volume augmentation remains a challenge. Finding strategies for bone regeneration such as combining resorbable minerals with organic polymers would contribute to solving the bone volume roadblock. Here, dicalcium phosphate dihydrate, chitosan and hyaluronic acid were used to functionalize a bone-side collagen membrane. Despite an increase in the release of inflammatory mediators by human circulating monocytes, the in vivo implantation of the functionalized membrane allowed the repair of a critical-sized defect in a calvaria rat model with de novo bone exhibiting physiological matrix composition and structural organization. Microtomography, histological and Raman analysis combined with nanoindentation testing revealed an increase in bone volume in the presence of the functionalized membrane and the formation of woven bone after eight weeks of implantation; these data showed the potential of dicalcium phosphate dihydrate, chitosan and hyaluronic acid to induce an efficient repair of critical-sized bone defects and establish the importance of thorough multi-scale characterization in assessing biomaterial outcomes in animal models.
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Affiliation(s)
- Marie Dubus
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
- UFR d’Odontologie, Université de Reims Champagne Ardenne, 51100 Reims, France
| | - Loïc Scomazzon
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
| | - Charlotte Ledouble
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
- UFR d’Odontologie, Université de Reims Champagne Ardenne, 51100 Reims, France
- Pôle Médecine Bucco-Dentaire, Hôpital Maison Blanche, Centre Hospitalier Universitaire de Reims, 51100 Reims, France
| | - Julien Braux
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
- UFR d’Odontologie, Université de Reims Champagne Ardenne, 51100 Reims, France
- Pôle Médecine Bucco-Dentaire, Hôpital Maison Blanche, Centre Hospitalier Universitaire de Reims, 51100 Reims, France
| | - Abdelilah Beljebbar
- BioSpecT EA 7506, Université de Reims Champagne Ardenne, 51100 Reims, France
- UFR de Pharmacie, Université de Reims Champagne Ardenne, 51100 Reims, France
| | - Laurence Van Gulick
- BioSpecT EA 7506, Université de Reims Champagne Ardenne, 51100 Reims, France
| | - Adrien Baldit
- Ecole Nationale d’Ingénieurs de Metz, CNRS, LEM3, Université de Lorraine, 57078 Metz, France
| | - Caroline Gorin
- URP2496, Pathologies, UFR Odontologie, Imagerie et Biothérapies Orofaciales et Plateforme Imagerie du Vivant, Université Paris Cité, 92120 Montrouge, France
- AP-HP, Services Médecines Bucco-Dentaire (GH Paris Sud-Sorbonne Université), 92120 Montrouge, France
| | - Halima Alem
- CNRS, IJL, Université de Lorraine, 54500 Nancy, France
| | - Nicole Bouland
- Service d’Anatomo-Pathologie, Université de Reims Champagne Ardenne, 51100 Reims, France
| | - Marissa Britton
- Biomechanics Research Centre (BioMEC), Biomedical Engineering, School of Engineering, College of Science and Engineering, National University of Ireland, H91 HX31 Galway, Ireland
| | - Jessica Schiavi
- Biomechanics Research Centre (BioMEC), Biomedical Engineering, School of Engineering, College of Science and Engineering, National University of Ireland, H91 HX31 Galway, Ireland
| | - Ted J. Vaughan
- Biomechanics Research Centre (BioMEC), Biomedical Engineering, School of Engineering, College of Science and Engineering, National University of Ireland, H91 HX31 Galway, Ireland
| | - Cédric Mauprivez
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
- UFR d’Odontologie, Université de Reims Champagne Ardenne, 51100 Reims, France
- Pôle Médecine Bucco-Dentaire, Hôpital Maison Blanche, Centre Hospitalier Universitaire de Reims, 51100 Reims, France
| | - Halima Kerdjoudj
- Biomatériaux et Inflammation en Site Osseux (BIOS), Université de Reims Champagne Ardenne, EA 4691 Reims, France
- UFR d’Odontologie, Université de Reims Champagne Ardenne, 51100 Reims, France
- Correspondence:
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Ryan J, Jacob P, Lee A, Gagnon Z, Pavel IE. Biodistribution and toxicity of antimicrobial ionic silver (Ag +) and silver nanoparticle (AgNP +) species after oral exposure, in Sprague-Dawley rats. Food Chem Toxicol 2022; 166:113228. [PMID: 35710031 DOI: 10.1016/j.fct.2022.113228] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/04/2022] [Accepted: 06/08/2022] [Indexed: 01/22/2023]
Abstract
Although antimicrobial nanosilver finds numerous applications in the health and food industries, the in vivo toxicity of positively charged silver nanoparticles (AgNPs+) and relevant controls are largely unexplored. This study investigates the relationship between the biodistribution and toxicity of the well-known cetyltrimethylammonium bromide (CTAB)-capped AgNPs+ in 6-weeks old female Sprague-Dawley rats, at sublethal doses. Amounts comparative to those leaked from food products or considered for animal feed were administered through daily water intake, for an 18-day period: AgNPs+ (40 μg mL-1), Ag+ (40 μg mL-1), antimicrobial CTAB+ (24 μg mL-1) and tap water. All exposures except for the water control had adverse effects on the health and systemic functions of rats (e.g., lethargy, hepatomegaly, splenomegaly, impediment of bone development, and/or heightened immune response). Although the total Ag accumulation in tissues (1.4-1.6 μg of Ag/g of liver, spleen, jejunum, and brain) was comparable for the two Ag species, AgNPs+ were generally more toxic than Ag+, particularly in spleen (0.8 μg Ag/g). Significantly reduced euthanasia time, alopecia, inflammatory responses in spleen, fragile veins, and enhanced lymphocytosis were observed only for AgNPs+. Overall, this study raises health concerns about the ingestion of capped-AgNPs+ or Ag+ by first-hand consumers and industry workers.
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Affiliation(s)
- John Ryan
- Wright State University, Department of Chemistry, 3640 Colonel Glenn Hwy, Fairborn, OH, 45435, USA
| | - Paige Jacob
- Cornell University, Department of Civil and Environmental Engineering, 527 College Ave, Ithaca, NY, 14853, USA
| | - Alec Lee
- Marist College, Department of Environmental Science, 3399 North Rd, Poughkeepsie, NY, 12601, USA
| | - Zofia Gagnon
- Marist College, Department of Environmental Science, 3399 North Rd, Poughkeepsie, NY, 12601, USA.
| | - Ioana E Pavel
- Texas A&M University at Corpus Christi, Department of Physical and Environmental Sciences, 6300 Ocean Drive, Corpus Christi, TX, 78412-5800, USA.
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8
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Bioengineering the ameloblastoma tumour to study its effect on bone nodule formation. Sci Rep 2021; 11:24088. [PMID: 34916549 PMCID: PMC8677805 DOI: 10.1038/s41598-021-03484-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 12/03/2021] [Indexed: 01/09/2023] Open
Abstract
Ameloblastoma is a benign, epithelial cancer of the jawbone, which causes bone resorption and disfigurement to patients affected. The interaction of ameloblastoma with its tumour stroma drives invasion and progression. We used stiff collagen matrices to engineer active bone forming stroma, to probe the interaction of ameloblastoma with its native tumour bone microenvironment. This bone-stroma was assessed by nano-CT, transmission electron microscopy (TEM), Raman spectroscopy and gene analysis. Furthermore, we investigated gene correlation between bone forming 3D bone stroma and ameloblastoma introduced 3D bone stroma. Ameloblastoma cells increased expression of MMP-2 and -9 and RANK temporally in 3D compared to 2D. Our 3D biomimetic model formed bone nodules of an average surface area of 0.1 mm2 and average height of 92.37 [Formula: see text] 7.96 μm over 21 days. We demonstrate a woven bone phenotype with distinct mineral and matrix components and increased expression of bone formation genes in our engineered bone. Introducing ameloblastoma to the bone stroma, completely inhibited bone formation, in a spatially specific manner. Multivariate gene analysis showed that ameloblastoma cells downregulate bone formation genes such as RUNX2. Through the development of a comprehensive bone stroma, we show that an ameloblastoma tumour mass prevents osteoblasts from forming new bone nodules and severely restricted the growth of existing bone nodules. We have identified potential pathways for this inhibition. More critically, we present novel findings on the interaction of stromal osteoblasts with ameloblastoma.
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9
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Sousa RC, Viana VGF, Meneses LFC, Maia Filho ALM, Santos FEP, Azevedo MMF, Nascimento HMS, Pinto LSS, Vasconcelos DFP. In vivo evaluation of bone repair guided with biological membrane based on polyhydroxybutyrate and norbixin. J Biomed Mater Res B Appl Biomater 2021; 110:743-754. [PMID: 34632693 DOI: 10.1002/jbm.b.34953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 08/23/2021] [Accepted: 09/29/2021] [Indexed: 11/09/2022]
Abstract
The present work aimed to synthesize and verify the effectiveness of the polyhydroxybutyrate and norbixin membrane as a scaffold in bone defects induced in the tibia of rats. Twenty-four male Rattus norvegicus rats were used, divided into control and membrane groups. After anesthesia, a bone defect was induced in the right tibia, followed by the implantation of the biomaterial at the site of the lesion only in the membrane group, with euthanasia after 15 and 30 days of the experiment. The deposition of organic and inorganic matrix, the quality of newly formed bone tissue and the morphology of the bone defect were measured. After 15 days of the experiment, the biomaterial significantly influenced the deposition of hydroxyapatite crystals, the formation of collagen I matrix and mineralization content in relation to the control group, in addition to the abbreviation of the inflammatory process and superior quality of the newly formed bone tissue. After 30 days, only the membrane group had fully completed its repair process. The biomaterial acted as a scaffold in the regeneration of the guided bone defect by accelerating the synthesis of collagen matrix, mineralization content, density, and maturity when compared to the control group.
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Affiliation(s)
- Rayssilane C Sousa
- Programa de Pós-Graduação em Biotecnologia/RENORBIO, Universidade Federal do Piauí, Teresina, Brazil
| | - Vicente G F Viana
- Programa de Pós-Graduação em Engenharia de Materiais, Instituto Federal de Educação, Ciência e Tecnologia do Piauí, Teresina, Brazil
| | - Luiz F C Meneses
- Programa de Pós-Graduação em Engenharia de Materiais, Instituto Federal de Educação, Ciência e Tecnologia do Piauí, Teresina, Brazil
| | - Antônio L M Maia Filho
- Núcleo de Pesquisa em Biotecnologia e Biodiversidade, Universidade Estadual do Piauí, Teresina, Brazil
| | | | | | - Hélio M S Nascimento
- Programa de Pós-Graduação em Biotecnologia/RENORBIO, Universidade Federal do Piauí, Teresina, Brazil
| | - Lucielma S S Pinto
- Departamento de Histologia e Embriologia da Faculdade de Ciências Médicas da Universidade Estadual do Piauí (UESPI), CCS/FACIME, Teresina, Brazil
| | - Daniel F P Vasconcelos
- Programa de Pós-Graduação em Biotecnologia/RENORBIO, Universidade Federal do Piauí, Teresina, Brazil
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Fosca M, Basoli V, Della Bella E, Russo F, Vadala G, Alini M, Rau JV, Verrier S. Raman spectroscopy in skeletal tissue disorders and tissue engineering: present and prospective. TISSUE ENGINEERING PART B-REVIEWS 2021; 28:949-965. [PMID: 34579558 DOI: 10.1089/ten.teb.2021.0139] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Musculoskeletal disorders are the most common reason of chronic pain and disability representing worldwide an enormous socio-economic burden. In this review, new biomedical application fields for Raman spectroscopy (RS) technique related to skeletal tissues are discussed showing that it can provide a comprehensive profile of tissue composition in situ, in a rapid, label-free, and non-destructive manner. RS can be used as a tool to study tissue alterations associated to aging, pathologies, and disease treatments. The main advantage with respect to currently applied methods in clinics is its ability to provide specific information on molecular composition, which goes beyond other diagnostic tools. Being compatible with water, RS can be performed without pre-treatment on unfixed, hydrated tissue samples, without any labelling and chemical fixation used in histochemical methods. This review provides first the description of basic principles of RS as a biotechnology tool and introduces into the field of currently available RS based techniques, developed to enhance Raman signal. The main spectral processing statistical tools, fingerprint identification and available databases are mentioned. The recent literature has been analysed for such applications of RS as tendon and ligaments, cartilage, bone, and tissue engineered constructs for regenerative medicine. Several cases of proof-of-concept preclinical studies have been described. Finally, advantages, limitations, future perspectives, and challenges for translation of RS into clinical practice have been also discussed.
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Affiliation(s)
- Marco Fosca
- Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche, 204549, Roma, Lazio, Italy;
| | - Valentina Basoli
- AO Research Institute Davos, 161930, Regenerative Orthopaedics, Davos, Graubünden, Switzerland;
| | - Elena Della Bella
- AO Research Institute Davos, 161930, Regenerative Orthopaedics, Davos, Graubünden, Switzerland;
| | - Fabrizio Russo
- Campus Bio-Medico University Hospital, 220431, Roma, Lazio, Italy;
| | - Gianluca Vadala
- Campus Bio-Medico University Hospital, 220431, Roma, Lazio, Italy;
| | - Mauro Alini
- AO Research Institute Davos, 161930, Regenerative Orthopaedics, Davos, Graubünden, Switzerland;
| | - Julietta V Rau
- Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche, 204549, Roma, Lazio, Italy.,I M Sechenov First Moscow State Medical University, 68477, Moskva, Moskva, Russian Federation;
| | - Sophie Verrier
- AO Research Institute Davos, 161930, Regenerative Orthopaedics, Davos, Graubünden, Switzerland;
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Chalikias S, Papaioannou N, Koundis G, Pappa E, Galanos A, Anastassopoulos G, Sarris IN, Panteliou S, Chronopoulos E, Dontas IA. Evaluation of Femoral Bone Fracture Healing in Rats by the Modal Damping Factor and Its Correlation With Peripheral Quantitative Computed Tomography. Cureus 2021; 13:e13342. [PMID: 33754085 PMCID: PMC7971724 DOI: 10.7759/cureus.13342] [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] [Indexed: 11/27/2022] Open
Abstract
Introduction Monitoring the progress of fracture healing is essential in order to establish the appropriate timing that ensures adequate bone strength for weight-bearing. In the present experimental study on a rat model of femoral fracture healing, the measurement of bone density and strength by peripheral quantitative computerized tomography (pQCT) was correlated with the modal damping factor (MDF) method. Methods Four groups of 12 male six-month-old Wistar rats each were anesthetized and submitted to baseline femoral pQCT and MDF scanning, followed by aseptic midshaft osteotomy of the right femur which was fixed by a locking intramedullary nail technique. The animals were left to recover and re-scanned following euthanasia of each group after six, eight, 10, and 12 weeks, respectively. The parameters measured by the pQCT method were total bone mineral density (BMD) and polar strength strain index (SSIp). Results Fracture healing progressed over time and at 12 weeks post-osteotomy there was no statistically significant difference between the osteotomized right and the control left femurs regarding MDF, BMD, and SSIp measurements. The highest correlations for the osteotomized femurs were observed between MDF and BMD (r = -0.647, P = 0.043), and between MDF and SSIp (r = -0.350, P = 0.321), at 10 weeks postoperatively. The high to moderate correlations between MDF and BMD, and between MDF and SSIp respectively, support the validity of MDF in assessing fracture healing. Conclusions Based on our findings in this fracture healing animal model, the results from the MDF method are reliable and correlate highly with the total BMD and moderately with the SSI polar values obtained by the pQCT method of bone quality measurement. Further studies are needed which may additionally support that the MDF method can be an attractive portable alternative to monitor fracture healing in the community.
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Affiliation(s)
- Stavros Chalikias
- Department of Orthopedics, Golden Jubilee National Hospital, Glasgow, GBR
| | - Nikolaos Papaioannou
- Laboratory for Research of the Musculoskeletal System, KAT General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, GRC
| | - George Koundis
- 5th Department of Orthopedics, KAT General Hospital, Athens, GRC
| | - Eleni Pappa
- 5th Department of Orthopedics, KAT General Hospital, Athens, GRC
| | - Antonios Galanos
- Laboratory for Research of the Musculoskeletal System, KAT General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, GRC
| | | | - Ioannis N Sarris
- Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, GRC
| | - Sofia Panteliou
- Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, GRC
| | - Efstathios Chronopoulos
- Laboratory for Research of the Musculoskeletal System, KAT General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, GRC.,2nd Department of Orthopedics, Konstantopouleio General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, GRC
| | - Ismene A Dontas
- Laboratory for Research of the Musculoskeletal System, KAT General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, GRC
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12
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Improved prediction of femoral fracture toughness in mice by combining standard medical imaging with Raman spectroscopy. J Biomech 2021; 116:110243. [PMID: 33485148 DOI: 10.1016/j.jbiomech.2021.110243] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 09/13/2020] [Accepted: 01/03/2021] [Indexed: 12/12/2022]
Abstract
Bone fragility and fracture risk are assessed by measuring the areal bone mineral density (aBMD) using dual-energy X-ray absorptiometry (DXA). While aBMD correlates with bone strength, it is a poor predictor of fragility fracture risk. Alternatively, fracture toughness assesses the bone's resistance to crack propagation and fracture, making it a suitable bone quality metric. Here, we explored how femoral midshaft measurements from DXA, micro-computed tomography (µCT), and Raman spectroscopy could predict fracture toughness. We hypothesized that ovariectomy (OVX) decreases aBMD and fracture toughness compared to controls and we can optimize a multivariate assessment of bone quality by combining results from X-ray and Raman spectroscopy. Female mice underwent an OVX (n = 5) or sham (n = 5) surgery at 3 months of age. Femurs were excised 3 months after ovariectomy and assessed with Raman spectroscopy, µCT, and DXA. Subsequently, a notch was created on the anterior side of the mid-diaphysis of the femurs. Three-point bending induced a controlled fracture that initiated at the notch. The OVX mice had a significantly lower aBMD, cortical thickness, and fracture toughness when compared to controls (p < 0.05). A leave one out cross-validated (LOOCV) partial least squares regression (PLSR) model based only on the combination of aBMD and cortical thickness showed no significant predictive correlations with fracture toughness, whereas a PLSR model based on principal components derived from the full Raman spectra yielded significant prediction (r2 = 0.71, p < 0.05). Further, the PLSR model was improved by incorporating aBMD, cortical thickness, and principal components from Raman spectra (r2 = 0.92, p < 0.001). This exploratory study demonstrates combining X-ray with Raman spectroscopy leads to a more accurate assessment of bone fracture toughness and could be a useful diagnostic tool for the assessment of fragility fracture risk.
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13
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Multimodal characterization of the bone-implant interface using Raman spectroscopy and nanoindentation. Med Eng Phys 2020; 84:60-67. [DOI: 10.1016/j.medengphy.2020.07.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/27/2020] [Accepted: 07/13/2020] [Indexed: 02/06/2023]
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Mehta M, Naffa R, Maidment C, Holmes G, Waterland M. RAMAN AND ATR-FTIR SPECTROSCOPY TOWARDS CLASSIFICATION OF WET BLUE BOVINE LEATHER USING RATIOMETRIC AND CHEMOMETRIC ANALYSIS. JOURNAL OF LEATHER SCIENCE AND ENGINEERING 2020. [DOI: 10.1186/s42825-019-0017-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Abstract
There is a substantial loss of value in bovine leather every year due to a leather quality defect known as “looseness”. Data show that 7% of domestic hide production is affected to some degree, with a loss of $35 m in export returns. This investigation is devoted to gaining a better understanding of tight and loose wet blue leather based on vibrational spectroscopy observations of its structural variations caused by physical and chemical changes that also affect the tensile and tear strength. Several regions from the wet blue leather were selected for analysis. Samples of wet blue bovine leather were collected and studied in the sliced form using Raman spectroscopy (using 532 nm excitation laser) and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR-FTIR) spectroscopy. The purpose of this study was to use ATR-FTIR and Raman spectra to classify distal axilla (DA) and official sampling position (OSP) leather samples and then employ univariate or multivariate analysis or both. For univariate analysis, the 1448 cm− 1 (CH2 deformation) band and the 1669 cm− 1 (Amide I) band were used for evaluating the lipid-to-protein ratio from OSP and DA Raman and IR spectra as indicators of leather quality. Curve-fitting by the sums-of-Gaussians method was used to calculate the peak area ratios of 1448 and 1669 cm− 1 band. The ratio values obtained for DA and OSP are 0.57 ± 0.099, 0.73 ± 0.063 for Raman and 0.40 ± 0.06 and 0.50 ± 0.09 for ATR-FTIR. The results provide significant insight into how these regions can be classified. Further, to identify the spectral changes in the secondary structures of collagen, the Amide I region (1600–1700 cm− 1) was investigated and curve-fitted-area ratios were calculated. The 1648:1681 cm− 1 (non-reducing: reducing collagen types) band area ratios were used for Raman and 1632:1650 cm− 1 (triple helix: α-like helix collagen) for IR. The ratios show a significant difference between the two classes. To support this qualitative analysis, logistic regression was performed on the univariate data to classify the samples quantitatively into one of the two groups. Accuracy for Raman data was 90% and for ATR-FTIR data 100%. Both Raman and ATR-FTIR complemented each other very well in differentiating the two groups. As a comparison, and to reconfirm the classification, multivariate analysis was performed using Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA). The results obtained indicate good classification between the two leather groups based on protein and lipid content. Principal component score 2 (PC2) distinguishes OSP and DA by symmetrically grouping samples at positive and negative extremes. The study demonstrates an excellent model for wider research on vibrational spectroscopy for early and rapid diagnosis of leather quality.
Graphical abstract
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Tsui SM, Ahmed R, Amjad N, Ahmed I, Yang J, Manno F, Barman I, Shih WC, Lau C. Single red blood cell analysis reveals elevated hemoglobin in poikilocytes. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-13. [PMID: 31975576 PMCID: PMC6976897 DOI: 10.1117/1.jbo.25.1.015004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 01/08/2020] [Indexed: 05/03/2023]
Abstract
Abnormally shaped red blood cells (RBCs), called poikilocytes, can cause anemia. At present, the biochemical abnormalities in poikilocytes are not well understood. Normal RBCs and poikilocytes were analyzed using whole-blood and single-cell methods. Poikilocytes were induced in rat blood by intragastrically administering titanium dioxide (TiO2) nanoparticles. Complete blood count and inductively coupled plasma mass spectrometry analyses were performed on whole-blood to measure average RBC morphology, blood hemoglobin (HGB), iron content, and other blood parameters. Follow-up confocal Raman spectroscopy was performed on single RBCs to analyze cell-type-specific HGB content. Two types of poikilocytes, acanthocytes and echinocytes, were observed in TiO2 blood samples, along with normal RBCs. Acanthocytes (diameter 7.7 ± 0.5 μm) and echinocytes (7.6 ± 0.6 μm) were microscopically larger (p < 0.05) than normal RBCs (6.6 ± 0.4 μm) found in control blood samples (no TiO2 administration). Similarly, mean corpuscular volume was higher (p < 0.05) in TiO2 whole-blood (70.70 ± 1.97 fl) than in control whole-blood (67.42 ± 2.03 fl). Poikilocytes also had higher HGB content. Mean corpuscular hemoglobin was higher (p < 0.05) in TiO2 whole-blood (21.84 ± 0.75 pg) than in control whole-blood (20.8 ± 0.32 pg). Iron content was higher (p < 0.001) in TiO2 whole-blood (697.0 ± 24.5 mg / l) than in control whole-blood (503.4 ± 38.5 mg / l), which supports elevated HGB as iron is found in HGB. HGB-associated Raman bands at 1637, 1585, and 1372 cm - 1 had higher (p < 0.001) amplitudes in acanthocytes and echinocytes than in RBCs from control blood and normal RBCs from TiO2 blood. Further, the 1585-cm - 1 band had a lower (p < 0.05) amplitude in normal RBCs from TiO2 versus control RBCs. This represents biochemical abnormalities in normal appearing RBCs. Overall, poikilocytes, especially acanthocytes, have elevated HGB.
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Affiliation(s)
- Suet Man Tsui
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
| | - Rafay Ahmed
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
| | - Noreen Amjad
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
| | - Irfan Ahmed
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
- Sukkur IBA University, Department of Electrical Engineering, Sukkur, Pakistan
| | - Jingwei Yang
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
| | - Francis Manno
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
- University of Sydney, School of Biomedical Engineering, Faculty of Engineering, Sydney, New South Wales, Australia
| | - Ishan Barman
- Johns Hopkins University, Department of Mechanical Engineering, Baltimore, Maryland, United States
- Johns Hopkins University, Department of Oncology, Baltimore, Maryland, United States
- Johns Hopkins University, Department of Radiology and Radiological Science, Baltimore, Maryland, United States
| | - Wei-Chuan Shih
- University of Houston, Department of Electrical and Computer Engineering, Houston, Texas, United States
| | - Condon Lau
- City University of Hong Kong, Department of Physics, Hong Kong SAR, China
- Address all correspondence to Condon Lau, E-mail:
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Ahmed R, Wang W, Zia AW, Lau C. Collagen formation observed from healing calvarial defects with principal component analysis of Raman scattering. Analyst 2018; 143:4614-4622. [PMID: 30204815 DOI: 10.1039/c8an01021h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bone healing is a complex process involving molecular changes. Bone matrix consists of collagen proteins that serve as the framework and minerals, calcium and phosphate, are deposited into the matrix accordingly. Raman spectroscopy is a promising technique to study bone mineral and matrix environments simultaneously. We studied the bone composition using 785 nm excitation during healing of subcritical calvarial defects without disrupting the fracture. Calvarial defects (in vivo) were created using a 1 mm burr drill on the parietal bones of Sprague-Dawley rats (n = 12). After 7 days, subjects were sacrificed and an additional defect (control) was created. Principal component analysis was utilized for the analysis of Raman spectra and helped in classifying normal and healing bone. Principal component 1 (PC1) shows that the major variation between in vivo and control defects and normal bone surface is at 958 cm-1 (ν1 phosphate band). PC2 shows a major variation at 1448 cm-1 (CH2 deformation). PC2 score distinguishes in vivo defects from normal surface and control defects. The decrease in crystallinity and mineral to matrix ratio at the healing site as revealed by Raman confirms the new bone formation. Scanning electron and optical microscopy show the formation of newly generated matrix by means of bony bridges of collagens. The surface roughness increases by 23% from control to in vivo defects, as revealed by optical profiler. Histology shows the decreased depth of in vivo defects and new blood vessels formation. Overall, the new collagen formation shows the scaffolding of the bone is growing during healing.
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Affiliation(s)
- Rafay Ahmed
- Department of Physics, City University of Hong Kong, Hong Kong.
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