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Extracellular Ca2+ aggravates IgE-induced allergic reaction in mast cells through GPRC6A, a novel family C G-protein-coupled receptor. Life Sci 2022; 311:121013. [DOI: 10.1016/j.lfs.2022.121013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/17/2022] [Accepted: 09/26/2022] [Indexed: 11/06/2022]
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Chaweewannakorn C, Harada T, Nyasha MR, Koide M, Shikama Y, Hagiwara Y, Sasaki K, Kanzaki M, Tsuchiya M. Imaging of muscle activity-induced morphometric changes in fibril network of myofascia by two-photon microscopy. J Anat 2021; 238:515-526. [PMID: 33078407 PMCID: PMC7855069 DOI: 10.1111/joa.13339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 08/10/2020] [Accepted: 09/28/2020] [Indexed: 01/15/2023] Open
Abstract
Myofascia, deep fascia enveloping skeletal muscles, consists of abundant collagen and elastin fibres that play a key role in the transmission of muscular forces. However, understanding of biomechanical dynamics in myofascia remains very limited due to less quantitative and relevant approaches for in vivo examination. The purpose of this study was to evaluate the myofascial fibril structure by means of a quantitative approach using two-photon microscopy (TPM) imaging in combination with intravital staining of Evans blue dye (EBD), a far-red fluorescence dye, which potentially labels elastin. With focus on myofascia of the tibial anterior (TA) muscle, the fibril structure intravitally stained with EBD was observed at the depth level of collagen fibrous membrane above the muscle belly. The EBD-labelled fibril structure and orientation in myofascia indicated biomechanical responses to muscle activity and ageing. The orientation histograms of EBD-labelled fibrils were significantly modified depending upon the intensity of muscle activity and ageing. Moreover, the density of EBD-labelled fibrils in myofascia decreased with habitual exercise but increased with muscle immobilization or ageing. In particular, the diameter of EBD-labelled fibrils in aged mice was significantly higher. The orientation histograms of EBD-labelled fibrils after habitual exercise, muscle immobilization and ageing showed significant differences compared to control. Indeed, the histograms in bilateral TA myofascia of exercise mice made simple waveforms without multiple sharp peaks, whilst muscular immobilization or ageing significantly shifted a histogram with sustaining multiple sharp peaks. Therefore, the dynamics of fibre network with EBD fluorescence in response to the biomechanical environment possibly indicate functional tissue adaptation in myofascia. Furthermore, on the basis of the knowledge that neutrophil recruitment occurs locally in working muscles, we suggested the unique reconstruction mechanism involving neutrophilic elastase in the myofascial fibril structure. In addition to the elastolytic susceptibility of EBD-labelled fibrils, distinct immunoreactivities and activities of neutrophil elastase in the myofascia were observed after electric pulse stimulation-induced muscle contraction for 15 min. Our findings of EBD-labelled fibril dynamics in myofascia through quantitative approach using TPM imaging and intravital fluorescence labelling potentially brings new insights to examine muscle physiology and pathology.
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Affiliation(s)
- Chayanit Chaweewannakorn
- Division of Advanced Prosthetic DentistryGraduate School of DentistryTohoku UniversitySendaiJapan
- Graduate School of Biomedical EngineeringTohoku UniversitySendaiJapan
| | - Takashi Harada
- Department of Orthopaedic SurgeryGraduate School of MedicineTohoku UniversitySendaiJapan
| | - Mazvita R. Nyasha
- Graduate School of Biomedical EngineeringTohoku UniversitySendaiJapan
| | - Masashi Koide
- Department of Orthopaedic SurgeryGraduate School of MedicineTohoku UniversitySendaiJapan
| | - Yosuke Shikama
- Department of Oral Disease ResearchNational Center for Geriatrics and GerontologyObuJapan
| | - Yoshihiro Hagiwara
- Department of Orthopaedic SurgeryGraduate School of MedicineTohoku UniversitySendaiJapan
| | - Keiichi Sasaki
- Division of Advanced Prosthetic DentistryGraduate School of DentistryTohoku UniversitySendaiJapan
| | - Makoto Kanzaki
- Graduate School of Biomedical EngineeringTohoku UniversitySendaiJapan
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Liu Z, Liu S, Shi H, Ren H, Wang R, Yang J, Guo T. Fluorescently labeled degradable thermoplastic polyurethane elastomers: Visual evaluation for the degradation behavior. J Appl Polym Sci 2015. [DOI: 10.1002/app.42519] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhengsheng Liu
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Shuai Liu
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Heguang Shi
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Hongqi Ren
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Ruiyu Wang
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Jixiang Yang
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
| | - Tianying Guo
- Key laboratory of Functional Polymer Materials (Nankai University); Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University; Tianjin 300071 China
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Hintersteiner M, Auer M. A two-channel detection method for autofluorescence correction and efficient on-bead screening of one-bead one-compound combinatorial libraries using the COPAS fluorescence activated bead sorting system. Methods Appl Fluoresc 2013; 1:017001. [PMID: 29148437 DOI: 10.1088/2050-6120/1/1/017001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
One-bead one-compound combinatorial library beads exhibit varying levels of autofluorescence after solid phase combinatorial synthesis. Very often this causes significant problems for automated on-bead screening using TentaGel beads and fluorescently labeled target proteins. Herein, we present a method to overcome this limitation when fluorescence activated bead sorting is used as the screening method. We have equipped the COPAS bead sorting instrument with a high-speed profiling unit and developed a spectral autofluorescence correction method. The correction method is based on a simple algebraic operation using the fluorescence data from two detection channels and is applied on-the-fly in order to reliably identify hit beads by COPAS bead sorting. Our method provides a practical tool for the fast and efficient isolation of hit beads from one-bead one-compound library screens using either fluorescently labeled target proteins or biotinylated target proteins. This method makes hit bead identification easier and more reliable. It reduces false positives and eliminates the need for time-consuming pre-sorting of library beads in order to remove autofluorescent beads.
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High resolution fluorescence microscopy evidence on the transport of immunoglobulins. Differences between mammalian IgG, F(abʹ)2 and avian IgY. Toxicon 2013; 63:7-18. [DOI: 10.1016/j.toxicon.2012.10.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 10/18/2012] [Accepted: 10/30/2012] [Indexed: 11/21/2022]
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Kim SH, Lee JH, Hyun H, Ashitate Y, Park G, Robichaud K, Lunsford E, Lee SJ, Khang G, Choi HS. Near-infrared fluorescence imaging for noninvasive trafficking of scaffold degradation. Sci Rep 2013; 3:1198. [PMID: 23386968 PMCID: PMC3564022 DOI: 10.1038/srep01198] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 01/18/2013] [Indexed: 11/13/2022] Open
Abstract
Biodegradable scaffolds could revolutionize tissue engineering and regenerative medicine; however, in vivo matrix degradation and tissue ingrowth processes are not fully understood. Currently a large number of samples and animals are required to track biodegradation of implanted scaffolds, and such nonconsecutive single-time-point information from various batches result in inaccurate conclusions. To overcome this limitation, we developed functional biodegradable scaffolds by employing invisible near-infrared fluorescence and followed their degradation behaviors in vitro and in vivo. Using optical fluorescence imaging, the degradation could be quantified in real-time, while tissue ingrowth was tracked by measuring vascularization using magnetic resonance imaging in the same animal over a month. Moreover, we optimized the in vitro process of enzyme-based biodegradation to predict implanted scaffold behaviors in vivo, which was closely related to the site of inoculation. This combined multimodal imaging will benefit tissue engineers by saving time, reducing animal numbers, and offering more accurate conclusions.
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Affiliation(s)
- Soon Hee Kim
- Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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Cunha-Reis C, El Haj AJ, Yang X, Yang Y. Fluorescent labeling of chitosan for use in non-invasive monitoring of degradation in tissue engineering. J Tissue Eng Regen Med 2011; 7:39-50. [PMID: 22125289 DOI: 10.1002/term.494] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 02/26/2011] [Accepted: 07/12/2011] [Indexed: 01/06/2023]
Abstract
The establishment of non-invasive analytical tools for assessing the in-situ use of biomaterials for surgical implants or scaffolds in tissue engineering and polymer-based therapies is fundamental. This study established a method for fluorescent tracking of the degradation of a chitosan membrane scaffold for use in vitro in bioreactors and ultimately in vivo. The basis of this tracking system is a fluorescence emitting biomaterial obtained by covalent binding of the fluorophore tetramethylrhodamine isothiocyanate (TRITC) onto the backbone of chitosan. Using confocal microscopy, this study quantitated the reductions in fluorescence intensity of the membrane and correlated these decreases with weight loss during polymer breakdown, thereby providing a technique for non-destructively assessing the extent of degradation of chitosan materials over time in vitro. Using multispectral imaging in a mouse model, the study assessed the degradation profile of the fluorophore-labeled biomaterial in vivo in real time and identified the dispersing pathway of the chitosan membrane degradation products in vivo. The results revealed that TRITC conjugated chitosan was biocompatible and supported bone cell growth. The changes in fluorescence intensity correlated well with weight loss up to 16 weeks of in vitro culture and could be monitored over two weeks in vivo.
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Affiliation(s)
- Cassilda Cunha-Reis
- Institute for Science and Technology in Medicine, School of Medicine, Keele University, Stoke-on-Trent, ST4 7QB, UK
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Arnold SA, Rivera LB, Miller AF, Carbon JG, Dineen SP, Xie Y, Castrillon DH, Sage EH, Puolakkainen P, Bradshaw AD, Brekken RA. Lack of host SPARC enhances vascular function and tumor spread in an orthotopic murine model of pancreatic carcinoma. Dis Model Mech 2009; 3:57-72. [PMID: 20007485 DOI: 10.1242/dmm.003228] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Utilizing subcutaneous tumor models, we previously validated SPARC (secreted protein acidic and rich in cysteine) as a key component of the stromal response, where it regulated tumor size, angiogenesis and extracellular matrix deposition. In the present study, we demonstrate that pancreatic tumors grown orthotopically in Sparc-null (Sparc(-/-)) mice are more metastatic than tumors grown in wild-type (Sparc(+/+)) littermates. Tumors grown in Sparc(-/-) mice display reduced deposition of fibrillar collagens I and III, basement membrane collagen IV and the collagen-associated proteoglycan decorin. In addition, microvessel density and pericyte recruitment are reduced in tumors grown in the absence of host SPARC. However, tumors from Sparc(-/-) mice display increased permeability and perfusion, and a subsequent decrease in hypoxia. Finally, we found that tumors grown in the absence of host SPARC exhibit an increase in alternatively activated macrophages. These results suggest that increased tumor burden in the absence of host SPARC is a consequence of reduced collagen deposition, a disrupted vascular basement membrane, enhanced vascular function and an immune-tolerant, pro-metastatic microenvironment.
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Affiliation(s)
- Shanna A Arnold
- Hamon Center for Therapeutic Oncology Research, Department of Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Cremers SG, Weinberg PD. Use of a desktop scanner and spreadsheet software for mapping arterial disease. SCANNING 2005; 27:126-31. [PMID: 15934503 DOI: 10.1002/sca.4950270304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Mapping the surface area and distribution of atherosclerosis has so far required photographic, video, or photomicrographic imaging of the inner surface of the arterial wall, as well as laborious manual or sophisticated image processing methods of quantification. We investigated whether comparable results could be obtained by using a conventional flatbed scanner and readily available spreadsheet software. Lipid-rich lesions near 21 aortic branches from cholesterol-fed rabbits were mapped using a scanner-based technique and an established photomicrographic technique. When the tissue was counterstained and held on the scanner by a transparent weight to obtain adequate contrast and prevent detection of adventitial staining, the areas of lipid deposition detected by the two methods correlated highly (R2 = 0.99). Discrepancies arose mainly at the edges of lesions, probably because of alignment errors and better flattening of the tissue on the scanner; when these were accounted for, discrepancies occurred in < 1% of the total area examined. The new method produces results comparable with previous procedures, but is much more rapid and requires only office equipment and software.
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Affiliation(s)
- Stephanie G Cremers
- Physiological Flow Studies Group, Department of Bioengineering, Imperial College, London, UK
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Brown RC, Egleton RD, Davis TP. Mannitol opening of the blood-brain barrier: regional variation in the permeability of sucrose, but not 86Rb+ or albumin. Brain Res 2004; 1014:221-7. [PMID: 15213006 DOI: 10.1016/j.brainres.2004.04.034] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2004] [Indexed: 11/17/2022]
Abstract
Clinically, infusion of hyperosmolar solutions is used to enhance chemotherapeutic drug penetration of the blood-brain barrier (BBB) in patients with malignant brain tumors or metastases. We examined the effect of hyperosmolar BBB disruption on brain permeability of three compounds, 86Rb+, a marker for K+ permeability and transport, [14C]sucrose and Evans blue albumin, using a rat in situ perfusion model. 86Rb+ and [14C]sucrose had increased permeability 20 min after BBB disruption with 1.6 M mannitol. There was no change in Evans blue albumin permeability. Only [14C]sucrose showed regional variation in permeability after mannitol-induced BBB disruption, with the cortex and midbrain having higher sucrose permeability then either the cerebellum or brainstem. These data suggest that the clinical efficacy of hyperosmolar disruption therapy in conjunction with chemotherapeutic agents, of a similar molecular weight to sucrose, may be affected by the location of the tumor within the brain.
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Affiliation(s)
- Rachel C Brown
- Department of Pharmacology, The University of Arizona, College of Medicine, PO Box 24-5050, 1501 N. Campbell Ave., Tucson, AZ 85724, USA
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