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Ahmed A, Mansouri M, Joshi IM, Byerley AM, Day SW, Gaborski TR, Abhyankar VV. Local extensional flows promote long-range fiber alignment in 3D collagen hydrogels. Biofabrication 2022; 14. [PMID: 35735228 DOI: 10.1088/1758-5090/ac7824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 06/13/2022] [Indexed: 02/07/2023]
Abstract
Randomly oriented type I collagen (COL1) fibers in the extracellular matrix are reorganized by biophysical forces into aligned domains extending several millimeters and with varying degrees of fiber alignment. These aligned fibers can transmit traction forces, guide tumor cell migration, facilitate angiogenesis, and influence tissue morphogenesis. To create aligned COL1 domains in microfluidic cell culture models, shear flows have been used to align thin COL1 matrices (<50µm in height) in a microchannel. However, there has been limited investigation into the role of shear flows in aligning 3D hydrogels (>130µm). Here, we show that pure shear flows do not induce fiber alignment in 3D atelo COL1 hydrogels, but the simple addition of local extensional flow promotes alignment that is maintained across several millimeters, with a degree of alignment directly related to the extensional strain rate. We further advance experimental capabilities by addressing the practical challenge of accessing a 3D hydrogel formed within a microchannel by introducing a magnetically coupled modular platform that can be released to expose the microengineered hydrogel. We demonstrate the platform's capability to pattern cells and fabricate multi-layered COL1 matrices using layer-by-layer fabrication and specialized modules. Our approach provides an easy-to-use fabrication method to achieve advanced hydrogel microengineering capabilities that combine fiber alignment with biofabrication capabilities.
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Affiliation(s)
- Adeel Ahmed
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Mehran Mansouri
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Indranil M Joshi
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Ann M Byerley
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Steven W Day
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Thomas R Gaborski
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
| | - Vinay V Abhyankar
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States of America
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Johnson JK, Cottle BK, Mondal A, Hitchcock R, Kaza AK, Sachse FB. Localization of the sinoatrial and atrioventricular nodal region in neonatal and juvenile ovine hearts. PLoS One 2020; 15:e0232618. [PMID: 32379798 PMCID: PMC7205220 DOI: 10.1371/journal.pone.0232618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 04/17/2020] [Indexed: 11/18/2022] Open
Abstract
Localization of the components of the cardiac conduction system (CCS) is essential for many therapeutic procedures in cardiac surgery and interventional cardiology. While histological studies provided fundamental insights into CCS localization, this information is incomplete and difficult to translate to aid in intraprocedural localization. To advance our understanding of CCS localization, we set out to establish a framework for quantifying nodal region morphology. Using this framework, we quantitatively analyzed the sinoatrial node (SAN) and atrioventricular node (AVN) in ovine with postmenstrual age ranging from 4.4 to 58.3 months. In particular, we studied the SAN and AVN in relation to the epicardial and endocardial surfaces, respectively. Using anatomical landmarks, we excised the nodes and adjacent tissues, sectioned those at a thickness of 4 μm at 100 μm intervals, and applied Masson's trichrome stain to the sections. These sections were then imaged, segmented to identify nodal tissue, and analyzed to quantify nodal depth and superficial tissue composition. The minimal SAN depth ranged between 20 and 926 μm. AVN minimal depth ranged between 59 and 1192 μm in the AVN extension region, 49 and 980 μm for the compact node, and 148 and 888 μm for the transition to His Bundle region. Using a logarithmic regression model, we found that minimal depth increased logarithmically with age for the AVN (R2 = 0.818, P = 0.002). Also, the myocardial overlay of the AVN was heterogeneous within different regions and decreased with increasing age. Age associated alterations of SAN minimal depth were insignificant. Our study presents examples of characteristic tissue patterns superficial to the AVN and within the SAN. We suggest that the presented framework provides quantitative information for CCS localization. Our studies indicate that procedural methods and localization approaches in regions near the AVN should account for the age of patients in cardiac surgery and interventional cardiology.
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Affiliation(s)
- Jordan K. Johnson
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, United States of America
- Nora Eccles Harrison Cardiovascular Research and Training Institute, Salt Lake City, Utah, United States of America
| | - Brian K. Cottle
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, United States of America
- Nora Eccles Harrison Cardiovascular Research and Training Institute, Salt Lake City, Utah, United States of America
| | - Abhijit Mondal
- Cardiac Surgery, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Robert Hitchcock
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, United States of America
| | - Aditya K. Kaza
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, United States of America
- Cardiac Surgery, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Frank B. Sachse
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, United States of America
- Nora Eccles Harrison Cardiovascular Research and Training Institute, Salt Lake City, Utah, United States of America
- * E-mail:
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Mirsanaye K, Golaraei A, Habach F, Žurauskas E, Venius J, Rotomskis R, Barzda V. Polar organization of collagen in human cardiac tissue revealed with polarimetric second-harmonic generation microscopy. BIOMEDICAL OPTICS EXPRESS 2019; 10:5025-5030. [PMID: 31646027 PMCID: PMC6788612 DOI: 10.1364/boe.10.005025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 05/18/2023]
Abstract
Polarimetric second-harmonic generation (P-SHG) microscopy is used to characterize the composition and polarity of collagen fibers in various regions of human cardiac tissue. The boundary between the cardiac conduction system and myocardium is shown to possess a distinct composition of collagen compared to other regions in the heart. Moreover, collagen fibers in this region are macroscopically organized in a unipolar arrangement, which may consequently aid in effective propagation of the electrical signal through the cardiac conduction system.
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Affiliation(s)
- Kamdin Mirsanaye
- Department of Physics, University of Toronto, 60 St. George St, Toronto, M5S 1A7, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd North, Mississauga, L5L 1C6, Canada
| | - Ahmad Golaraei
- Department of Physics, University of Toronto, 60 St. George St, Toronto, M5S 1A7, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd North, Mississauga, L5L 1C6, Canada
- Princess Margaret Cancer Centre, University Health Network, 101 College St, Toronto, M5G 1L7, Canada
| | - Fayez Habach
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd North, Mississauga, L5L 1C6, Canada
| | - Edvardas Žurauskas
- Department of Pathology, Forensic Medicine and Pharmacology, Faculty of Medicine, Vilnius University, M.K. Ciurlionio St 21/27, LT-03101, Vilnius, Lithuania
| | - Jonas Venius
- Biomedical Physics Laboratory, National Cancer Institute, P. Baublio St 3b, LT-08406, Vilnius, Lithuania
- Medical Physics Department, National Cancer Institute, Santariskiu St 1, LT-08660, Vilnius, Lithuania
| | - Ricardas Rotomskis
- Biomedical Physics Laboratory, National Cancer Institute, P. Baublio St 3b, LT-08406, Vilnius, Lithuania
- Laser Research Center, Vilnius University, Sauletekio Ave 9 corp. III, LT-10222, Vilnius, Lithuania
| | - Virginijus Barzda
- Department of Physics, University of Toronto, 60 St. George St, Toronto, M5S 1A7, Canada
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd North, Mississauga, L5L 1C6, Canada
- Laser Research Center, Vilnius University, Sauletekio Ave 9 corp. III, LT-10222, Vilnius, Lithuania
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