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Kumar M, Banerjee P, Das A, Singh K, Guith T, Kacar S, Gourishetti K, Sen CK, Roy S, Khanna S. Hydrolyzed Collagen Powder Dressing Improves Wound Inflammation, Perfusion, and Breaking Strength of Repaired Tissue. Adv Wound Care (New Rochelle) 2024; 13:70-82. [PMID: 37534840 DOI: 10.1089/wound.2023.0065] [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: 08/04/2023] Open
Abstract
Objective: Hydrolyzed collagen-based matrices are widely used as wound care dressings. Information on the mechanism of action of such dressings is scanty. The objective of this study was to test the effect of a specific hydrolyzed collagen powder (HCP), which is extensively used for wound care management in the United States. Approach: The effects of HCP on resolution of wound inflammation, perfusion, closure, and breaking strength of the repaired skin were studied in an experimental murine model. Results: In early (day 7) inflammatory phase of wound macrophages, HCP treatment boosted phagocytosis and efferocytosis of wound-site macrophages. In these cells, inducible reactive oxygen species were also higher on day (d) 7. HCP treatment potentiated the expression of anti-inflammatory interleukin (IL)-10 cytokine and proangiogenic vascular endothelial growth factor (VEGF) production. Excisional wounds dressed with HCP showed complete closure on day 21, while the control wounds remained open. HCP treatment also demonstrated improved quality of wound healing as marked by the improved breaking strength of the closed wound tissue/repaired skin. Innovation: These data represent first evidence on the mechanism of action of clinically used HCP. Conclusion: HCP dressing favorably influenced both wound inflammation and vascularization. Improved breaking strength of HCP-treated repaired skin lays the rationale for future studies testing the hypothesis that HCP-treated closed wounds would show fewer recurrences.
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Affiliation(s)
- Manishekhar Kumar
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Pradipta Banerjee
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Amitava Das
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Kanhaiya Singh
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Tanner Guith
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Sedat Kacar
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Karthik Gourishetti
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Chandan K Sen
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Sashwati Roy
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Savita Khanna
- McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
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El Masry MS, Gnyawali SC, Sen CK. Robust critical limb ischemia porcine model involving skeletal muscle necrosis. Sci Rep 2023; 13:11574. [PMID: 37463916 DOI: 10.1038/s41598-023-37724-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 06/27/2023] [Indexed: 07/20/2023] Open
Abstract
This work sought to develop a robust and clinically relevant swine model of critical limb ischemia (CLI) involving the onset of ischemic muscle necrosis. CLI carries about 25-40% risk of major amputation with 20% annual mortality. Currently, there is no specific treatment that targets the ischemic myopathy characteristic of CLI. Current swine models of CLI, with tolerable side-effects, fail to achieve sustained ischemia followed by a necrotic myopathic endpoint. Such limitation in experimental model hinders development of effective interventions. CLI was induced unilaterally by ligation-excision of one inch of the common femoral artery (CFA) via infra-inguinal minimal incision in female Yorkshire pigs (n = 5). X-ray arteriography was done pre- and post-CFA transection to validate successful induction of severe ischemia. Weekly assessment of the sequalae of ischemia on limb perfusion, and degree of ischemic myopathy was conducted for 1 month using X-ray arteriography, laser speckle imaging, CTA angiography, femoral artery duplex, high resolution ultrasound and histopathological analysis. The non-invasive tissue analysis of the elastography images showed specific and characteristic pattern of increased muscle stiffness indicative of the fibrotic and necrotic outcome expected with associated total muscle ischemia. The prominent onset of skeletal muscle necrosis was evident upon direct inspection of the affected tissues. Ischemic myopathic changes associated with inflammatory infiltrates and deficient blood vessels were objectively validated. A translational model of severe hindlimb ischemia causing ischemic myopathy was successfully established adopting an approach that enables long-term survival studies in compliance with regulatory requirements pertaining to animal welfare.
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Affiliation(s)
- Mohamed S El Masry
- McGowan Institute for Regenerative Medicine, Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15219, USA.
- Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - Surya C Gnyawali
- McGowan Institute for Regenerative Medicine, Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15219, USA
- Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Chandan K Sen
- McGowan Institute for Regenerative Medicine, Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15219, USA.
- Indiana Center for Regenerative Medicine and Engineering, Indiana University Health Comprehensive Wound Center, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
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Chizari A, Tsong W, Knop T, Steenbergen W. Prediction of motion artifacts caused by translation in handheld laser speckle contrast imaging. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:046005. [PMID: 37082096 PMCID: PMC10112282 DOI: 10.1117/1.jbo.28.4.046005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 03/24/2023] [Indexed: 05/03/2023]
Abstract
Significance In handheld laser speckle contrast imaging (LSCI), motion artifacts (MA) are inevitable. Suppression of MA leads to a valid and objective assessment of tissue perfusion in a wide range of medical applications including dermatology and burns. Our study shines light on the sources of these artifacts, which have not yet been explored. We propose a model based on optical Doppler effect to predict speckle contrast drop as an indication of MA. Aim We aim to theoretically model MA when an LSCI system measuring on static scattering media is subject to translational displacements. We validate the model using both simulation and experiments. This is the crucial first step toward creating robustness against MA. Approach Our model calculates optical Doppler shifts in order to predict intensity correlation function and contrast of the time-integrated intensity as functions of applied speed based on illumination and detection wavevectors. To validate the theoretical predictions, computer simulation of the dynamic speckles has been carried out. Then experiments are performed by both high-speed and low-framerate imaging. The employed samples for the experiments are a highly scattering matte surface and a Delrin plate of finite scattering level in which volume scattering occurs. Results An agreement has been found between theoretical prediction, simulation, and experimental results of both intensity correlation functions and speckle contrast. Coefficients in the proposed model have been linked to the physical parameters according to the experimental setups. Conclusions The proposed model provides a quantitative description of the influence of the types of illumination and media in the creation of MA. The accurate prediction of MA caused by translation based on Doppler shifts makes our model suitable to study the influence of rotation. Also the model can be extended for the case of dynamic media, such as live tissue.
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Affiliation(s)
- Ata Chizari
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
- Address all correspondence to Ata Chizari,
| | - Wilson Tsong
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
| | - Tom Knop
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
| | - Wiendelt Steenbergen
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
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Pal D, Ghatak S, Singh K, Abouhashem AS, Kumar M, El Masry MS, Mohanty SK, Palakurti R, Rustagi Y, Tabasum S, Khona DK, Khanna S, Kacar S, Srivastava R, Bhasme P, Verma SS, Hernandez E, Sharma A, Reese D, Verma P, Ghosh N, Gorain M, Wan J, Liu S, Liu Y, Castro NH, Gnyawali SC, Lawrence W, Moore J, Perez DG, Roy S, Yoder MC, Sen CK. Identification of a physiologic vasculogenic fibroblast state to achieve tissue repair. Nat Commun 2023; 14:1129. [PMID: 36854749 PMCID: PMC9975176 DOI: 10.1038/s41467-023-36665-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 02/13/2023] [Indexed: 03/02/2023] Open
Abstract
Tissue injury to skin diminishes miR-200b in dermal fibroblasts. Fibroblasts are widely reported to directly reprogram into endothelial-like cells and we hypothesized that miR-200b inhibition may cause such changes. We transfected human dermal fibroblasts with anti-miR-200b oligonucleotide, then using single cell RNA sequencing, identified emergence of a vasculogenic subset with a distinct fibroblast transcriptome and demonstrated blood vessel forming function in vivo. Anti-miR-200b delivery to murine injury sites likewise enhanced tissue perfusion, wound closure, and vasculogenic fibroblast contribution to perfused vessels in a FLI1 dependent manner. Vasculogenic fibroblast subset emergence was blunted in delayed healing wounds of diabetic animals but, topical tissue nanotransfection of a single anti-miR-200b oligonucleotide was sufficient to restore FLI1 expression, vasculogenic fibroblast emergence, tissue perfusion, and wound healing. Augmenting a physiologic tissue injury adaptive response mechanism that produces a vasculogenic fibroblast state change opens new avenues for therapeutic tissue vascularization of ischemic wounds.
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Affiliation(s)
- Durba Pal
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
- Department of Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140001, India
| | - Subhadip Ghatak
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Kanhaiya Singh
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Ahmed Safwat Abouhashem
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Manishekhar Kumar
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Mohamed S El Masry
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Sujit K Mohanty
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Ravichand Palakurti
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Yashika Rustagi
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Saba Tabasum
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Dolly K Khona
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Savita Khanna
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Sedat Kacar
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Rajneesh Srivastava
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Pramod Bhasme
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Sumit S Verma
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Edward Hernandez
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Anu Sharma
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Diamond Reese
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Priyanka Verma
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Nandini Ghosh
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Mahadeo Gorain
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Jun Wan
- Center for Computational Biology and Bioinformatics (CCBB), Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Sheng Liu
- Center for Computational Biology and Bioinformatics (CCBB), Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Yunlong Liu
- Center for Computational Biology and Bioinformatics (CCBB), Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Natalia Higuita Castro
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Surya C Gnyawali
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - William Lawrence
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Jordan Moore
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Daniel Gallego Perez
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Sashwati Roy
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA
| | - Mervin C Yoder
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Chandan K Sen
- Indiana Center for Regenerative Medicine & Engineering, Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
- Department of Surgery, The Ohio State University, Columbus, OH, 43210, USA.
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, 43210, USA.
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The GPI-Anchored Protein Thy-1/CD90 Promotes Wound Healing upon Injury to the Skin by Enhancing Skin Perfusion. Int J Mol Sci 2022; 23:ijms232012539. [PMID: 36293394 PMCID: PMC9603913 DOI: 10.3390/ijms232012539] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/30/2022] [Accepted: 10/11/2022] [Indexed: 11/16/2022] Open
Abstract
Wound healing is a highly regulated multi-step process that involves a plethora of signals. Blood perfusion is crucial in wound healing and abnormalities in the formation of new blood vessels define the outcome of the wound healing process. Thy-1 has been implicated in angiogenesis and silencing of the Thy-1 gene retards the wound healing process. However, the role of Thy-1 in blood perfusion during wound closure remains unclear. We proposed that Thy-1 regulates vascular perfusion, affecting the healing rate in mouse skin. We analyzed the time of recovery, blood perfusion using Laser Speckle Contrast Imaging, and tissue morphology from images acquired with a Nanozoomer tissue scanner. The latter was assessed in a tissue sample taken with a biopsy punch on several days during the wound healing process. Results obtained with the Thy-1 knockout (Thy-1−/−) mice were compared with control mice. Thy-1−/− mice showed at day seven, a delayed re-epithelialization, increased micro- to macro-circulation ratio, and lower blood perfusion in the wound area. In addition, skin morphology displayed a flatter epidermis, fewer ridges, and almost no stratum granulosum or corneum, while the dermis was thicker, showing more fibroblasts and fewer lymphocytes. Our results suggest a critical role for Thy-1 in wound healing, particularly in vascular dynamics.
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Transient Thermal Response of Blood Vessels during Laser Irradiation Monitored by Laser Speckle Contrast Imaging. PHOTONICS 2022. [DOI: 10.3390/photonics9080520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Real-time monitoring of blood flow and thrombosis formation induced by laser irradiation is critical to reveal the thermal-damage mechanism and successfully implement vascular-dermatology laser surgery. Laser speckle contrast imaging (LSCI) is a non-invasive technique to visualize perfusion in various tissues. However, the ability of the LSCI to monitor the transient thermal response of blood vessels, especially thrombus formation during laser irradiation, requires further research. In this paper, an LSCI system was constructed and a 632 nm He-Ne laser was employed to illuminate a Sprague Dawley rat dorsal skin chamber model irradiated by a 1064 nm Nd: YAG therapy laser. The anisotropic diffusion filtering (ADF) technique is implemented after temporal LSCI (tLSCI) processing to improve the SNR and temporal resolution. The speckle flow index is used to characterize the blood-flow velocity to reduce the computational cost. The combination of the tLSCI and ADF increases the temporal resolution by five times and the SNR by 17.2 times and 16.14 times, without and with laser therapy, respectively. The laser-induced thrombus formation and vascular damage during laser surgery can be visualized without any exogenous labels, which provides a powerful tool for thrombus monitoring during laser surgery.
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Standardized Skin Flap Warming Effectively Improves Flap Survival without Obstructing Temperature Monitoring after DIEP. PLASTIC AND RECONSTRUCTIVE SURGERY - GLOBAL OPEN 2022; 10:e4153. [PMID: 35242493 PMCID: PMC8884534 DOI: 10.1097/gox.0000000000004153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 01/04/2022] [Indexed: 11/26/2022]
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Bhamidipati T, Kumar M, Verma SS, Mohanty SK, Kacar S, Reese D, Martinez MM, Kamocka MM, Dunn KW, Sen CK, Singh K. Epigenetic basis of diabetic vasculopathy. Front Endocrinol (Lausanne) 2022; 13:989844. [PMID: 36568089 PMCID: PMC9780391 DOI: 10.3389/fendo.2022.989844] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 11/21/2022] [Indexed: 12/13/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) causes peripheral vascular disease because of which several blood-borne factors, including vital nutrients fail to reach the affected tissue. Tissue epigenome is sensitive to chronic hyperglycemia and is known to cause pathogenesis of micro- and macrovascular complications. These vascular complications of T2DM may perpetuate the onset of organ dysfunction. The burden of diabetes is primarily because of a wide range of complications of which nonhealing diabetic ulcers represent a major component. Thus, it is imperative that current research help recognize more effective methods for the diagnosis and management of early vascular injuries. This review addresses the significance of epigenetic processes such as DNA methylation and histone modifications in the evolution of macrovascular and microvascular complications of T2DM.
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Affiliation(s)
- Theja Bhamidipati
- Department of Vascular Surgery, Jefferson-Einstein Medical Center, Philadelphia, PA, United States
| | - Manishekhar Kumar
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Sumit S. Verma
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Sujit K. Mohanty
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Sedat Kacar
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Diamond Reese
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Michelle M. Martinez
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Malgorzata M. Kamocka
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Kenneth W. Dunn
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Chandan K. Sen
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
- *Correspondence: Kanhaiya Singh, ; Chandan K. Sen,
| | - Kanhaiya Singh
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States
- *Correspondence: Kanhaiya Singh, ; Chandan K. Sen,
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9
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Lee S, Namgoong JM, Kim Y, Cha J, Kim JK. Multimodal imaging of laser speckle contrast imaging combined with mosaic filter-based hyperspectral imaging for precise surgical guidance. IEEE Trans Biomed Eng 2021; 69:443-452. [PMID: 34260344 DOI: 10.1109/tbme.2021.3097122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To enable a real-time surgical guidance system that simultaneously monitors blood vessel perfusion, oxygen saturation, thrombosis, and tissue recovery by combining multiple optical imaging techniques into a single system: visible imaging, mosaic filter-based snapshot hyperspectral imaging (HSI), and laser speckle contrast imaging (LSCI). METHODS The multimodal optical imaging system was demonstrated by clamping blood vessels in the small intestines of rats to create areas of restricted blood flow. Subsequent tissue damage and regeneration were monitored during procedures. Using LSCI, vessel perfusion was measured, revealing the biological activity and survival of organ tissues. Blood oxygen saturation was monitored using HSI in the near-infrared region. Principal component analysis was used over the spectral dimension to identify an HSI wavelength combination optimized for hemodynamic biomarker visualization. HSI and LSCI were complimentary, identifying thrombus generation and tissue recovery, which was not possible in either modality alone. RESULTS AND CONCLUSION By analyzing multimodal tissue information from visible imaging, LSCI perfusion imaging, and HSI, a recovery prognosis could be determined based on the blood supply to the organ. The unique combination of the complementary imaging techniques into a single surgical microscope holds promise for improving the real-time determination of blood supply and tissue prognosis during surgery. SIGNIFICANCE Precise real-time monitoring for vascular anomalies promises to reduce the risk of organ damage in precise surgical operations such as tissue resection and transplantation. In addition, the convergence of label-free imaging technologies removes delays associated with the injection and diffusion of vascular monitoring dyes.
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Morelli C, Castaldi L, Brown SJ, Streich LL, Websdale A, Taberner FJ, Cerreti B, Barenghi A, Blum KM, Sawitzke J, Frank T, Steffens LK, Doleschall B, Serrao J, Ferrarini D, Lechner SG, Prevedel R, Heppenstall PA. Identification of a population of peripheral sensory neurons that regulates blood pressure. Cell Rep 2021; 35:109191. [PMID: 34077727 PMCID: PMC8187988 DOI: 10.1016/j.celrep.2021.109191] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 04/14/2020] [Accepted: 05/09/2021] [Indexed: 02/08/2023] Open
Abstract
The vasculature is innervated by a network of peripheral afferents that sense and regulate blood flow. Here, we describe a system of non-peptidergic sensory neurons with cell bodies in the spinal ganglia that regulate vascular tone in the distal arteries. We identify a population of mechanosensitive neurons, marked by tropomyosin receptor kinase C (TrkC) and tyrosine hydroxylase in the dorsal root ganglia, which projects to blood vessels. Local stimulation of TrkC neurons decreases vessel diameter and blood flow, whereas systemic activation increases systolic blood pressure and heart rate variability via the sympathetic nervous system. Ablation of the neurons provokes variability in local blood flow, leading to a reduction in systolic blood pressure, increased heart rate variability, and ultimately lethality within 48 h. Thus, a population of TrkC+ sensory neurons forms part of a sensory-feedback mechanism that maintains cardiovascular homeostasis through the autonomic nervous system. TrkC+/Th+ DRG neurons project to blood vessels Local stimulation of TrkC+ DRG neurons decreases vessel diameter and blood flow Systemic activation of TrkC+ DRG neurons increases blood pressure and heart rate Ablation of TrkC+ neurons dysregulates cardiovascular homeostasis and is lethal
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Affiliation(s)
- Chiara Morelli
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy; Molecular Medicine Partnership Unit (MMPU), Heidelberg, Germany; Collaboration for joint PhD degree between EMBL Heidelberg, Heidelberg, Germany, and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany
| | - Laura Castaldi
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy; Molecular Medicine Partnership Unit (MMPU), Heidelberg, Germany
| | - Sam J Brown
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy
| | - Lina L Streich
- Collaboration for joint PhD degree between EMBL Heidelberg, Heidelberg, Germany, and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany; Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | | | - Francisco J Taberner
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy; Institute of Pharmacology, Heidelberg University, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | | | | | - Kevin M Blum
- Center for Regenerative Medicine, the Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH, USA; Department of Biomedical Engineering, the Ohio State University, Columbus, OH, USA
| | | | - Tessa Frank
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy
| | - Laura K Steffens
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | | | - Joana Serrao
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy
| | | | - Stefan G Lechner
- Institute of Pharmacology, Heidelberg University, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | - Robert Prevedel
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy; Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany; Developmental Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Paul A Heppenstall
- EMBL Rome, Via Ramarini 32, Monterotondo 00015, Italy; Molecular Medicine Partnership Unit (MMPU), Heidelberg, Germany.
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11
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Hassanein AH, Sinha M, Neumann CR, Mohan G, Khan I, Sen CK. A Murine Tail Lymphedema Model. J Vis Exp 2021:10.3791/61848. [PMID: 33645579 PMCID: PMC8056335 DOI: 10.3791/61848] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Lymphedema is extremity swelling caused by lymphatic dysfunction. The affected limb enlarges because of accumulation of fluid, adipose, and fibrosis. There is no cure for this disease. A mouse tail model that uses a focal full thickness skin excision near the base of the tail, resulting in tail swelling, has been used to study lymphedema. However, this model may result in vascular comprise and consequent tail necrosis and early tail swelling resolution, limiting its clinical translatability. The chronic murine tail lymphedema model induces sustained lymphedema over 15 weeks and a reliable perfusion to the tail. Enhancements of the traditional murine tail lymphedema model include 1) precise full thickness excision and lymphatic clipping using a surgical microscope, 2) confirmation of post-operative arterial and venous perfusion using high resolution laser speckle, and 3) functional assessment using indocyanine green near infrared laser lymphangiography. We also use tissue nanotransfection technology (TNT) for novel non-viral, transcutaneous, focal delivery of genetic cargo to the mouse tail vasculature.
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Affiliation(s)
- Aladdin H Hassanein
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine;
| | - Mithun Sinha
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine
| | - Colby R Neumann
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine
| | - Ganesh Mohan
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine
| | - Imran Khan
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine
| | - Chandan K Sen
- Department of Surgery, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine
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12
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Gnyawali SC, Sinha M, El Masry MS, Wulff B, Ghatak S, Soto-Gonzalez F, Wilgus TA, Roy S, Sen CK. High resolution ultrasound imaging for repeated measure of wound tissue morphometry, biomechanics and hemodynamics under fetal, adult and diabetic conditions. PLoS One 2020; 15:e0241831. [PMID: 33227015 PMCID: PMC7682876 DOI: 10.1371/journal.pone.0241831] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 10/21/2020] [Indexed: 02/07/2023] Open
Abstract
Non-invasive, repeated interrogation of the same wound is necessary to understand the tissue repair continuum. In this work, we sought to test the significance of non-invasive high-frequency high-resolution ultrasound technology for such interrogation. High-frequency high-resolution ultrasound imaging was employed to investigate wound healing under fetal and adult conditions. Quantitative tissue cellularity and elastic strain was obtained for visualization of unresolved inflammation using Vevo strain software. Hemodynamic properties of the blood flow in the artery supplying the wound-site were studied using color Doppler flow imaging. Non-invasive monitoring of fetal and adult wound healing provided unprecedented biomechanical and functional insight. Fetal wounds showed highly accelerated closure with transient perturbation of wound tissue cellularity. Fetal hemodynamics was unique in that sharp fall in arterial pulse pressure (APP) which was rapidly restored within 48h post-wounding. In adults, APP transiently increased post-wounding before returning to the pre-wounding levels by d10 post-wounding. The pattern of change in the elasticity of wound-edge tissue of diabetics was strikingly different. Severe strain acquired during the early inflammatory phase persisted with a slower recovery of elasticity compared to that of the non-diabetic group. Wound bed of adult diabetic mice (db/db) showed persistent hypercellularity compared to littermate controls (db/+) indicative of prolonged inflammation. Normal skin strain of db/+ and db/db were asynchronous. In db/db, severe strain acquired during the early inflammatory phase persisted with a slower recovery of elasticity compared to that of non-diabetics. This study showcases a versatile clinically relevant imaging platform suitable for real-time analyses of functional wound healing.
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Affiliation(s)
- Surya C. Gnyawali
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
| | - Mithun Sinha
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
- Department of Surgery, IUH Comprehensive Wound Center, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States of America
| | - Mohamed S. El Masry
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
- Department of Surgery, IUH Comprehensive Wound Center, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States of America
- Department of Plastic and Reconstructive Surgery, Zagazig University, Zagazig, Egypt
| | - Brian Wulff
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
| | - Subhadip Ghatak
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
- Department of Surgery, IUH Comprehensive Wound Center, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States of America
| | - Fidel Soto-Gonzalez
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
| | - Traci A. Wilgus
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
| | - Sashwati Roy
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
- Department of Surgery, IUH Comprehensive Wound Center, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States of America
| | - Chandan K. Sen
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine & Cell-Based Therapies, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America
- Department of Surgery, IUH Comprehensive Wound Center, Indiana Center for Regenerative Medicine and Engineering, Indiana University School of Medicine, Indianapolis, IN, United States of America
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13
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Li S, Mohamedi AH, Senkowsky J, Nair A, Tang L. Imaging in Chronic Wound Diagnostics. Adv Wound Care (New Rochelle) 2020; 9:245-263. [PMID: 32226649 PMCID: PMC7099416 DOI: 10.1089/wound.2019.0967] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/14/2019] [Indexed: 01/18/2023] Open
Abstract
Significance: Chronic wounds affect millions of patients worldwide, placing a huge burden on health care resources. Although significant progress has been made in the development of wound treatments, very few advances have been made in wound diagnosis. Recent Advances: Standard imaging methods like computed tomography, single-photon emission computed tomography, magnetic resonance imaging, terahertz imaging, and ultrasound imaging have been widely employed in wound diagnostics. A number of noninvasive optical imaging modalities like optical coherence tomography, near-infrared spectroscopy, laser Doppler imaging, spatial frequency domain imaging, digital camera imaging, and thermal and fluorescence imaging have emerged over the years. Critical Issues: While standard diagnostic wound imaging modalities provide valuable information, they cannot account for dynamic changes in the wound environment. In addition, they lack the capability to predict the healing outcome. Thus, there remains a pressing need for more efficient methods that can not only indicate the current state of the wound but also help determine whether the wound is on track to heal normally. Future Directions: Many imaging probes have been fabricated and shown to provide real-time assessment of tissue microenvironment and inflammatory responses in vivo. These probes have been demonstrated to noninvasively detect various changes in the wound environment, which include tissue pH, reactive oxygen species, fibrin deposition, matrix metalloproteinase production, and macrophage accumulation. This review summarizes the creation of these probes and their potential implications in wound monitoring.
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Affiliation(s)
- Shuxin Li
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
| | - Ali H. Mohamedi
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
| | | | | | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas
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14
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Cheng W, Lu J, Zhu X, Hong J, Liu X, Li M, Li P. Dilated Residual Learning With Skip Connections for Real-Time Denoising of Laser Speckle Imaging of Blood Flow in a Log-Transformed Domain. IEEE TRANSACTIONS ON MEDICAL IMAGING 2020; 39:1582-1593. [PMID: 31725373 DOI: 10.1109/tmi.2019.2953626] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Laser speckle contrast imaging (LSCI) is a wide-field and noncontact imaging technology for mapping blood flow. Although the denoising method based on block-matching and three-dimensional transform-domain collaborative filtering (BM3D) was proposed to improve its signal-to-noise ratio (SNR) significantly, the processing time makes it difficult to realize real-time denoising. Furthermore, it is still difficult to obtain an acceptable level of SNR with a few raw speckle images given the presence of significant noise and artifacts. A feed-forward denoising convolutional neural network (DnCNN) achieves state-of-the-art performance in denoising nature images and is efficiently accelerated by GPU. However, it performs poorly in learning with original speckle contrast images of LSCI owing to the inhomogeneous noise distribution. Therefore, we propose training DnCNN for LSCI in a log-transformed domain to improve training accuracy and it achieves an improvement of 5.13 dB in the peak signal-to-noise ratio (PSNR). To decrease the inference time and improve denoising performance, we further propose a dilated deep residual learning network with skip connections (DRSNet). The image-quality evaluations of DRSNet with five raw speckle images outperform that of spatially average denoising with 20 raw speckle images. DRSNet takes 35 ms (i.e., 28 frames per second) for denoising a blood flow image with 486×648 pixels on an NVIDIA 1070 GPU, which is approximately 2.5 times faster than DnCNN. In the test sets, DRSNet also improves 0.15 dB in the PSNR than that of DnCNN. The proposed network shows good potential in real-time monitoring of blood flow for biomedical applications.
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15
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Chizari A, Knop T, Sirmacek B, van der Heijden F, Steenbergen W. Exploration of movement artefacts in handheld laser speckle contrast perfusion imaging. BIOMEDICAL OPTICS EXPRESS 2020; 11:2352-2365. [PMID: 32499928 PMCID: PMC7249814 DOI: 10.1364/boe.387252] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/20/2020] [Accepted: 03/30/2020] [Indexed: 05/19/2023]
Abstract
Functional performance of handheld laser speckle contrast imaging (LSCI) is compromised by movement artefacts. Here we quantify the movements of a handheld LSCI system employing electromagnetic (EM) tracking and measure the applied translational, tilt and on-surface laser beam speeds. By observing speckle contrast on static objects, the magnitudes of translation and tilt of wavefronts are explored for various scattering levels of the objects. We conclude that for tissue mimicking static phantoms, on-surface speeds play a dominant role to wavefront tilt speed in creation of movement artefacts. The ratio depends on the optical properties of the phantom. Furthermore, with the same applied speed, the drop in the speckle contrast increases with decreasing reduced scattering coefficient, and hence the related movement artefact increases.
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Affiliation(s)
- Ata Chizari
- University of Twente, Biomedical Photonic Imaging, Technical Medical Centre, Faculty of Science and Technology, Enschede, P.O. Box 217, 7500 AE, The Netherlands
| | - Tom Knop
- University of Twente, Biomedical Photonic Imaging, Technical Medical Centre, Faculty of Science and Technology, Enschede, P.O. Box 217, 7500 AE, The Netherlands
| | - Beril Sirmacek
- University of Twente, Robotics and Mechatronics, Technical Medical Centre, Faculty of Electrical Engineering, Mathematics and Computer Science, Enschede, P.O. Box 217, 7500 AE, The Netherlands
| | - Ferdinand van der Heijden
- University of Twente, Robotics and Mechatronics, Technical Medical Centre, Faculty of Electrical Engineering, Mathematics and Computer Science, Enschede, P.O. Box 217, 7500 AE, The Netherlands
| | - Wiendelt Steenbergen
- University of Twente, Biomedical Photonic Imaging, Technical Medical Centre, Faculty of Science and Technology, Enschede, P.O. Box 217, 7500 AE, The Netherlands
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16
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A Robust Method for Adjustment of Laser Speckle Contrast Imaging during Transcranial Mouse Brain Visualization. PHOTONICS 2019. [DOI: 10.3390/photonics6030080] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Laser speckle imaging (LSI) is a well-known and useful approach for the non-invasive visualization of flows and microcirculation localized in turbid scattering media, including biological tissues (such as brain vasculature, skin capillaries etc.). Despite an extensive use of LSI for brain imaging, the LSI technique has several critical limitations. One of them is associated with inability to resolve a functionality of vessels. This limitation also leads to the systematic error in the quantitative interpretation of values of speckle contrast obtained for different vessel types, such as sagittal sinus, arteries, and veins. Here, utilizing a combined use of LSI and fluorescent intravital microscopy (FIM), we present a simple and robust method to overcome the limitations mentioned above for the LSI approach. The proposed technique provides more relevant, abundant, and valuable information regarding perfusion rate ration between different types of vessels that makes this method highly useful for in vivo brain surgical operations.
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17
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Evaluation of an Electro-Pneumatic Device for Artificial Capillary Pulse Generation used in a Prospective Study in Animals for Surgical Neck Wound Healing. Sci Rep 2019; 9:9837. [PMID: 31285533 PMCID: PMC6614409 DOI: 10.1038/s41598-019-46397-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 06/25/2019] [Indexed: 11/25/2022] Open
Abstract
The paper examines the development and testing of an electro-pneumatic device for wound healing therapy after surgery in the neck area. The device generates air pressure values in a miniaturized cuff using electronic circuitry to drive an electro-valve and air compressor. The device works in two distinct modes: continuous pressure mode and pulsating pressure mode. The pressure value setting can vary from 3 to 11 mmHg, and the pulsating pressure mode’s operating frequency range is approximately 0.1 to 0.3 Hz. Laboratory measurements were conducted to evaluate the device’s correct functioning in both continuous and pulsating pressure modes. A four-day prospective study with animals (n = 10) was also conducted to evaluate neck wound healing therapy using the electro-pneumatic device. Out of the twelve histological parameters analysed to reveal the differences between the experimental and control wounds, only one demonstrated a significant difference. Out of the ten animals treated with the device, three showed a significant difference in terms of benefit after therapy. We can therefore conclude that the device potentially improves the wound healing process in the neck area if the pre-set air pressure value does not exceed 8 mmHg.
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18
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Laser-based Techniques for Microcirculatory Assessment in Orthopedics and Trauma Surgery: Past, Present, and Future. Ann Surg 2019; 270:1041-1048. [PMID: 30672807 DOI: 10.1097/sla.0000000000003139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
: Microcirculatory integrity and proper function are the cornerstones to tissue nourishment and viability. In the clinical environment extended immobility, injuries, and inflammatory reactions demand local microcirculatory adaption to provide adequate supply. Assessment of endothelial adjustment capability and microcirculatory perfusion status, as direct or surrogate markers of disease, are therefore of uttermost interest to the treating physician. Given the simple, noninvasive, nonradiating nature of laser-based techniques for bedside or intraoperative microcirculatory perfusion assessment, this article's objective is to present a comprehensive overview of available techniques, their technological aspects, and current application. Advantages of individual methods are pointed out and compared with each other. The areas of medical utilization relevant to orthopedics and trauma surgery are exemplified and their available evidence elaborated. A particular focus is put on laser speckle contrast imaging, with its current and future influence on medical practice.
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19
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Corliss BA, Mathews C, Doty R, Rohde G, Peirce SM. Methods to label, image, and analyze the complex structural architectures of microvascular networks. Microcirculation 2019; 26:e12520. [PMID: 30548558 PMCID: PMC6561846 DOI: 10.1111/micc.12520] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/31/2018] [Accepted: 11/26/2018] [Indexed: 12/30/2022]
Abstract
Microvascular networks play key roles in oxygen transport and nutrient delivery to meet the varied and dynamic metabolic needs of different tissues throughout the body, and their spatial architectures of interconnected blood vessel segments are highly complex. Moreover, functional adaptations of the microcirculation enabled by structural adaptations in microvascular network architecture are required for development, wound healing, and often invoked in disease conditions, including the top eight causes of death in the Unites States. Effective characterization of microvascular network architectures is not only limited by the available techniques to visualize microvessels but also reliant on the available quantitative metrics that accurately delineate between spatial patterns in altered networks. In this review, we survey models used for studying the microvasculature, methods to label and image microvessels, and the metrics and software packages used to quantify microvascular networks. These programs have provided researchers with invaluable tools, yet we estimate that they have collectively attained low adoption rates, possibly due to limitations with basic validation, segmentation performance, and nonstandard sets of quantification metrics. To address these existing constraints, we discuss opportunities to improve effectiveness, rigor, and reproducibility of microvascular network quantification to better serve the current and future needs of microvascular research.
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Affiliation(s)
- Bruce A Corliss
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia
| | - Corbin Mathews
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia
| | - Richard Doty
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia
| | - Gustavo Rohde
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia
| | - Shayn M Peirce
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia
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20
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Lv W, Wang Y, Chen X, Fu X, Lu J, Li P. Enhancing vascular visualization in laser speckle contrast imaging of blood flow using multi-focus image fusion. JOURNAL OF BIOPHOTONICS 2019; 12:e201800100. [PMID: 29952071 DOI: 10.1002/jbio.201800100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 05/25/2018] [Accepted: 06/26/2018] [Indexed: 05/24/2023]
Abstract
Laser speckle contrast imaging (LSCI) is a full-field optical imaging method for monitoring blood flow and vascular morphology with high spatiotemporal resolution. However, due to the limited depth of field of optical system, it is difficult to capture a clear blood flow image with all blood vessels focused, especially for the non-planar biological tissues. In this study, a multi-focus image fusion method based on contourlet transform is introduced to reduce the misfocus effects in LSCI. The experimental results suggest that this method can provide an all-in-focus blood flow image, which is convenient to observe the blood vessels.
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Affiliation(s)
- Wenzhi Lv
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Wang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Xiao Chen
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoxi Fu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Jinling Lu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Pengcheng Li
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
- HUST-Suzhou Institute for Brainsmatics, Suzhou, China
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21
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Remer I, Pierre-Destine LF, Tay D, Golightly LM, Bilenca A. In vivo noninvasive visualization of retinal perfusion dysfunction in murine cerebral malaria by camera-phone laser speckle imaging. JOURNAL OF BIOPHOTONICS 2019; 12:e201800098. [PMID: 29900690 DOI: 10.1002/jbio.201800098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 06/08/2018] [Accepted: 06/11/2018] [Indexed: 05/12/2023]
Abstract
Cerebral malaria (CM) is a severe complication of Plasmodium falciparum infection associated with impaired cerebral blood flow. Visualization of the eye vasculature, which is embryologically derived from that of the brain, is used clinically to diagnose the syndrome. Here, we introduce camera-phone laser speckle imaging as a new tool for in vivo, noncontact two-dimensional mapping of blood flow dynamics in the experimental cerebral malaria (ECM) murine model of Plasmodium berghei ANKA. In a longitudinal study, we show that the camera-phone imager can detect an overall decrease in the retinal blood-flow-speed (BFS) as ECM develops in P. berghei ANKA infected mice, with no similar change observed in uninfected control mice or mice infected with a non-ECM inducing strain (P. berghei NK65). Furthermore, by analyzing relative alterations in the BFS of individual retinal vessels during the progression of ECM, we illustrate the strength of our imager in identifying different BFS-change heterogeneities in the retinas of ECM and uninfected mice. The technique creates new possibilities for objective investigations into the diagnosis and pathogenesis of CM noninvasively through the eye. The camera-phone laser speckle imager along with measured spatial blood perfusion maps of the retina of a mouse infected with P. berghei ANKA-a fatal ECM model-on different days during the progression of the infection (top, day 3 after infection; middle, day 5 after infection; and bottom, day 7 after infection).
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Affiliation(s)
- Itay Remer
- Biomedical Engineering Department, Ben-Gurion University of the Negev, Beersheba, Israel
| | | | - David Tay
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, New York
| | - Linnie M Golightly
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, New York
| | - Alberto Bilenca
- Biomedical Engineering Department, Ben-Gurion University of the Negev, Beersheba, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beersheba, Israel
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22
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Davoodzadeh N, Cano-Velázquez MS, Halaney DL, Jonak CR, Binder DK, Aguilar G. Evaluation of a transparent cranial implant as a permanent window for cerebral blood flow imaging. BIOMEDICAL OPTICS EXPRESS 2018; 9:4879-4892. [PMID: 30319909 PMCID: PMC6179387 DOI: 10.1364/boe.9.004879] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/27/2018] [Accepted: 09/12/2018] [Indexed: 05/11/2023]
Abstract
Laser speckle imaging (LSI) of mouse cerebral blood flow was compared through a transparent nanocrystalline yttria-stabilized zirconia (nc-YSZ) cranial implant over time (at days 0, 14, and 28, n = 3 mice), and vs. LSI through native skull (at day 60, n = 1 mouse). The average sharpness of imaged vessels was found to remain stable, with relative change in sharpness under 7.69% ± 1.2% over 28 days. Through-implant images of vessels at day 60 appeared sharper and smaller on average, with microvessels clearly visible, compared to through-skull images where vessels appeared blurred and distorted. These results suggest that long-term imaging through this implant is feasible.
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Affiliation(s)
- Nami Davoodzadeh
- Department of Mechanical Engineering, University of California, Riverside, CA, USA
| | | | - David L Halaney
- Department of Mechanical Engineering, University of California, Riverside, CA, USA
| | - Carrie R Jonak
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA, USA
| | - Devin K Binder
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA, USA
| | - Guillermo Aguilar
- Department of Mechanical Engineering, University of California, Riverside, CA, USA
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23
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Ghijsen M, Rice TB, Yang B, White SM, Tromberg BJ. Wearable speckle plethysmography (SPG) for characterizing microvascular flow and resistance. BIOMEDICAL OPTICS EXPRESS 2018; 9:3937-3952. [PMID: 30338166 PMCID: PMC6191642 DOI: 10.1364/boe.9.003937] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/11/2018] [Accepted: 07/18/2018] [Indexed: 05/04/2023]
Abstract
In this work we introduce a modified form of laser speckle imaging (LSI) referred to as affixed transmission speckle analysis (ATSA) that uses a single coherent light source to probe two physiological signals: one related to pulsatile vascular expansion (classically known as the photoplethysmographic (PPG) waveform) and one related to pulsatile vascular blood flow (named here the speckle plethysmographic (SPG) waveform). The PPG signal is determined by recording intensity fluctuations, and the SPG signal is determined via the LSI dynamic light scattering technique. These two co-registered signals are obtained by transilluminating a single digit (e.g. finger) which produces quasi-periodic waveforms derived from the cardiac cycle. Because PPG and SPG waveforms probe vascular expansion and flow, respectively, in cm-thick tissue, these complementary phenomena are offset in time and have rich dynamic features. We characterize the timing offset and harmonic content of the waveforms in 16 human subjects and demonstrate physiologic relevance for assessing microvascular flow and resistance.
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Affiliation(s)
- Michael Ghijsen
- Laser Microbeam and Medical Program, Beckman Laser Institute, 1002 Health Sciences Road, Irvine, CA 92612, USA
- Department of Biomedical Engineering, University of California, Irvine, CA 92697, USA
| | - Tyler B. Rice
- Laser Associated Sciences Inc., 16 Foxglove Way, Irvine, CA 92612, USA
| | - Bruce Yang
- Laser Associated Sciences Inc., 16 Foxglove Way, Irvine, CA 92612, USA
| | - Sean M. White
- Laser Associated Sciences Inc., 16 Foxglove Way, Irvine, CA 92612, USA
| | - Bruce J. Tromberg
- Laser Microbeam and Medical Program, Beckman Laser Institute, 1002 Health Sciences Road, Irvine, CA 92612, USA
- Department of Biomedical Engineering, University of California, Irvine, CA 92697, USA
- Department of Surgery, University of California, Irvine Medical Center, Orange, CA 92868, USA
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Namykin AA, Shushunova NA, Ulanova MV, Semyachkina-Glushkovskaya OV, Tuchin VV, Fedosov IV. Intravital molecular tagging velocimetry of cerebral blood flow using Evans Blue. JOURNAL OF BIOPHOTONICS 2018; 11:e201700343. [PMID: 29603902 DOI: 10.1002/jbio.201700343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 03/28/2018] [Indexed: 06/08/2023]
Abstract
The effects of light-driven enhancement of Evans Blue dye complexes with blood plasma proteins were observed for the first time, both in vitro and in vivo. The possible background of the effect concerns the photochemical cis-trans isomerization of the azo dye molecules. The effect was induced in the solution with a red laser with a wavelength of 638 nm, which corresponds to the peak of the dye absorption. The lifetime of the enhanced fluorescence is approximately 1 second and enables its use as an optically tagged molecular flow tracer for blood flow velocity measurements. Utilizing the effect, we performed for the first time the intravital molecular tagging velocimetry of the blood velocity in blood vessels in a living animal. The results of the measurements of the blood flow velocities in the cerebral veins of a group of healthy mice are presented.
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Affiliation(s)
- Anton A Namykin
- Saratov State University (National Research University), Saratov, Russia
| | | | - Maria V Ulanova
- Saratov State University (National Research University), Saratov, Russia
| | | | - Valery V Tuchin
- Saratov State University (National Research University), Saratov, Russia
- Tomsk State University (National Research University), Tomsk, Russia
- Institute of Precision Mechanics and Control, Russian Academy of Sciences, Saratov, Russia
| | - Ivan V Fedosov
- Saratov State University (National Research University), Saratov, Russia
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Robson JP, Kokhanenko P, Marshall JK, Phillips AR, van der Linden J. Increased visceral tissue perfusion with heated, humidified carbon dioxide insufflation during open abdominal surgery in a rodent model. PLoS One 2018; 13:e0195465. [PMID: 29617447 PMCID: PMC5884566 DOI: 10.1371/journal.pone.0195465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 03/22/2018] [Indexed: 01/07/2023] Open
Abstract
Tissue perfusion during surgery is important in reducing surgical site infections and promoting healing. This study aimed to determine if insufflation of the open abdomen with heated, humidified (HH) carbon dioxide (CO2) increased visceral tissue perfusion and core body temperature during open abdominal surgery in a rodent model. Using two different rodent models of open abdominal surgery, visceral perfusion and core temperature were measured. Visceral perfusion was investigated using a repeated measures crossover experiment with rodents receiving the same sequence of two alternating treatments: exposure to ambient air (no insufflation) and insufflation with HH CO2. Core body temperature was measured using an independent experimental design with three treatment groups: ambient air, HH CO2 and cold, dry (CD) CO2. Visceral perfusion was measured by laser speckle contrast analysis (LASCA) and core body temperature was measured with a rectal thermometer. Insufflation with HH CO2 into a rodent open abdominal cavity significantly increased visceral tissue perfusion (2.4 perfusion units (PU)/min (95% CI 1.23-3.58); p<0.0001) compared with ambient air, which significantly reduced visceral blood flow (-5.20 PU/min (95% CI -6.83- -3.58); p<0.0001). Insufflation of HH CO2 into the open abdominal cavity significantly increased core body temperature (+1.15 ± 0.14°C) compared with open cavities exposed to ambient air (-0.65 ± 0.52°C; p = 0.037), or cavities insufflated with CD CO2 (-0.73 ± 0.33°C; p = 0.006). Abdominal visceral temperatures also increased with HH CO2 insufflation compared with ambient air or CD CO2, as shown by infrared thermography. This study reports for the first time the use of LASCA to measure visceral perfusion in open abdominal surgery and shows that insufflation of open abdominal cavities with HH CO2 significantly increases visceral tissue perfusion and core body temperature.
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Affiliation(s)
| | | | | | - Anthony R. Phillips
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Jan van der Linden
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
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Digital imaging information technology for biospeckle activity assessment relative to bacteria and parasites. Lasers Med Sci 2017. [DOI: 10.1007/s10103-017-2256-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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