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Korneva A, Kimball EC, Johnson TV, Quillen SE, Pease ME, Quigley HA, Nguyen TD. Comparison of the Biomechanics of the Mouse Astrocytic Lamina Cribrosa Between Glaucoma and Optic Nerve Crush Models. Invest Ophthalmol Vis Sci 2023; 64:14. [PMID: 38088825 PMCID: PMC10720758 DOI: 10.1167/iovs.64.15.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 11/14/2023] [Indexed: 12/17/2023] Open
Abstract
Purpose The strain response of the mouse astrocytic lamina (AL) to an ex vivo mechanical test was compared between two protocols: eyes that underwent sustained intraocular pressure (IOP) increase and eyes after optic nerve crush. Methods Chronic IOP elevation was induced by microbead injection or the optic nerve was crushed in mice with widespread green fluorescence. After 3 days or 6 weeks, eyes were inflation tested by a published method of two-photon fluorescence to image the AL. Digital volume correlation was used to calculate strains. Optic nerve axon damage was also evaluated. Results In the central AL but not the peripheral AL, four strains were greater in eyes at the 3-day glaucoma time point than control (P from 0.029 to 0.049, n = 8 eyes per group). Also, at this time point, five strains were greater in the central AL compared to the peripheral AL (P from 0.041 to 0.00003). At the 6-week glaucoma time point, the strains averaged across the specimen, in the central AL, and the peripheral AL were indistinguishable from the respective controls. Strains were not significantly different between controls and eyes 3 days or 6 weeks after crush (n = 8 and 16). Conclusions We found alterations in the ex vivo mechanical behavior in eyes from mice with experimental glaucoma but not in those with crushed optic nerves. The results of this study demonstrate that significant axon injury does not directly affect mechanical behavior of the astrocytic lamina.
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Affiliation(s)
- Arina Korneva
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Elizabeth C. Kimball
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Thomas V. Johnson
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Sarah E. Quillen
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Mary E. Pease
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Harry A. Quigley
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
| | - Thao D. Nguyen
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
- Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland, United States
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Ling YTT, Korneva A, Quigley HA, Nguyen TD. Computational study of the mechanical behavior of the astrocyte network and axonal compartments in the mouse optic nerve head. Biomech Model Mechanobiol 2023; 22:1751-1772. [PMID: 37573553 PMCID: PMC10988382 DOI: 10.1007/s10237-023-01752-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 07/15/2023] [Indexed: 08/15/2023]
Abstract
Glaucoma is a blinding disease characterized by the degeneration of the retinal ganglion cell (RGC) axons at the optic nerve head (ONH). A major risk factor for glaucoma is the intraocular pressure (IOP). However, it is currently impossible to measure the IOP-induced mechanical response of the axons of the ONH. The objective of this study was to develop a computational modeling method to estimate the IOP-induced strains and stresses in the axonal compartments in the mouse astrocytic lamina (AL) of the ONH, and to investigate the effect of the structural features on the mechanical behavior. We developed experimentally informed finite element (FE) models of six mouse ALs to investigate the effect of structure on the strain responses of the astrocyte network and axonal compartments to pressure elevation. The specimen-specific geometries of the FE models were reconstructed from confocal fluorescent images of cryosections of the mouse AL acquired in a previous study that measured the structural features of the astrocytic processes and axonal compartments. The displacement fields obtained from digital volume correlation in prior inflation tests of the mouse AL were used to determine the displacement boundary conditions of the FE models. We then applied Gaussian process regression to analyze the effects of the structural features on the strain outcomes simulated for the axonal compartments. The axonal compartments experienced, on average, 6 times higher maximum principal strain but 1800 times lower maximum principal stress compared to those experienced by the astrocyte processes. The strains experienced by the axonal compartments were most sensitive to variations in the area of the axonal compartments. Larger axonal compartments that were more vertically aligned, closer to the AL center, and with lower local actin area fraction had higher strains. Understanding the factors affecting the deformation in the axonal compartments will provide insights into mechanisms of glaucomatous axonal damage.
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Affiliation(s)
- Yik Tung Tracy Ling
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Arina Korneva
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Harry A Quigley
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Thao D Nguyen
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA.
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA.
- Department of Materials Science, Johns Hopkins University, Baltimore, MD, USA.
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Greaney AM, Ramachandra AB, Yuan Y, Korneva A, Humphrey JD, Niklason LE. Decellularization compromises mechanical and structural properties of the native trachea. Biomater Biosyst 2023; 9:100074. [PMID: 36967724 PMCID: PMC10036236 DOI: 10.1016/j.bbiosy.2023.100074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 01/01/2023] [Accepted: 01/27/2023] [Indexed: 02/05/2023] Open
Abstract
Tracheal replacement using tissue engineering technologies offers great potential to improve previously intractable clinical interventions, and interest in this area has increased in recent years. Many engineered airway constructs currently rely on decellularized native tracheas to serve as the scaffold for tissue repair. Yet, mechanical failure leading to airway narrowing and collapse remains a major cause of morbidity and mortality following clinical implantation of decellularized tracheal grafts. To understand better the factors contributing to mechanical failure in vivo, we characterized the histo-mechanical properties of tracheas following two different decellularization protocols, including one that has been used clinically. All decellularized tracheas deviated from native mechanical behavior, which may provide insights into observed in vivo graft failures. We further analyzed protein content by western blot and analyzed microstructure by histological staining and found that the specific method of decellularization resulted in significant differences in the depletion of proteoglycans and degradation of collagens I, II, III, and elastin. Taken together, this work demonstrates that the heterogeneous architecture and mechanical behavior of the trachea is severely compromised by decellularization. Such structural deterioration may contribute to graft failure clinically and limit the potential of decellularized native tracheas as viable long-term orthotopic airway replacements.
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Affiliation(s)
- Allison M. Greaney
- Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA
- Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT 06511, USA
| | | | - Yifan Yuan
- Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT 06511, USA
- Department of Anesthesiology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Arina Korneva
- Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA
| | - Jay D. Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA
- Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT 06511, USA
| | - Laura E. Niklason
- Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA
- Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT 06511, USA
- Department of Anesthesiology, Yale School of Medicine, New Haven, CT 06510, USA
- Humacyte Inc., Durham, NC 27713, USA
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Madhoun S, Martins MTC, Korneva A, Johnson TV, Kimball E, Quillen S, Pease ME, Edwards M, Quigley H. Effects of experimental glaucoma in Lama1 nmf223 mutant mice. Exp Eye Res 2023; 226:109341. [PMID: 36476399 DOI: 10.1016/j.exer.2022.109341] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 11/10/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
To identify changes in response to experimental intraocular pressure (IOP) elevation associated with the laminin α1 nmf223 mutation in mice. Laminin mutant (LM) mice (Lama1nmf223) and C57BL/6J (B6) mice in two age groups each (4-5 months and >1 year) underwent intracameral microbead injections to produce unilaterally elevated IOP. We assessed axonal transport block of immunofluorescently labeled amyloid precursor protein (APP) after 3 days and retinal ganglion cell (RGC) axon loss after 6 weeks. Light, electron and fluorescent microscopy was used to study baseline anatomic differences and effects of 3-day IOP elevation in younger LM mice. In younger mice of both LM and B6 strains, elevated IOP led to increased APP block in the retina, prelaminar optic nerve head (preONH), unmyelinated optic nerve (UON), and myelinated optic nerve (MON). APP blockade not significantly different between younger B6 and LM mouse strains. Older LM mice had greater APP accumulation in both control and glaucoma eyes compared to older B6, however, accumulation was not significantly greater in LM glaucoma eyes compared to LM controls. Axon loss at 6 weeks was 12.2% in younger LM and 18.7% in younger B6 mice (difference between strains, p = 0.22, Mann Whitney test). Untreated LM optic nerve area was lower compared to B6 (nerve area, p < 0.0001, t-test). Aberrant axon bundles, as well as defects, thickening and reduplication of pia mater, were seen in the optic nerves of younger LM mice. Axonal transport blockade significantly differed between old B6 and old LM mice in control and glaucoma eyes, and younger LM mice had abnormal axon paths and lower optic nerve area.
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Affiliation(s)
- Salaheddine Madhoun
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA.
| | | | - Arina Korneva
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Thomas V Johnson
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Elizabeth Kimball
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Sarah Quillen
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Mary Ellen Pease
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Malia Edwards
- Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Harry Quigley
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
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Korneva A, Kimball EC, Quillen S, Jefferys JL, Nawathe M, Ling YTT, Nguyen TD, Quigley HA. Mechanical strain in the mouse astrocytic lamina increases after exposure to recombinant trypsin. Acta Biomater 2022; 163:312-325. [PMID: 35196555 PMCID: PMC9391529 DOI: 10.1016/j.actbio.2022.02.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 01/21/2022] [Accepted: 02/16/2022] [Indexed: 11/30/2022]
Abstract
The responses of astrocytes in the optic nerve head (ONH) to mechanical and biochemical stimuli are important to understanding the degeneration of retinal ganglion cell axons in glaucoma. The ONH in glaucoma is vulnerable to stress produced by the intraocular pressure (IOP). Notably, after three days of elevated IOP in a mouse model, the junctions between the astrocytic processes and the peripapillary sclera were altered and the structural compliance of the ONH increased. In order to simulate this aspect of glaucomatous remodeling, explanted mouse eyes were treated with TrypLE, a recombinant trypsin enzyme. Treatment with TrypLE caused the periphery of the astrocytic lamina to contract radially by 0.044 ± 0.038. Transmission electron microscopy showed that TrypLE caused a separation of the end-feet of the astrocyte processes from the basement membrane at the junction with the sclera. Inflation testing after treatment with TrypLE caused an increased strain response in the astrocytic lamina compared to the strain response before treatment. The greatest increase was in the radial Green-Lagrange strain, Err = 0.028 ± 0.009, which increased by 340%. The alterations in the microstructure and in the strain response of the astrocytic lamina reported in mouse experimental glaucoma were partially reproduced by experimental treatment of mouse eyes with TrypLE. The results herein suggest that separation of junctions between the astrocyte processes and the sclera may be instrumental in increasing the structural compliance of the ONH after a period of elevated IOP. STATEMENT OF SIGNIFICANCE: Astrocytes of the optic nerve of the eye spread out from edge to edge across the optic nerve in a region referred to as the astrocytic lamina. In an experimental model of glaucoma caused by elevated eye-pressure, there is disruption of the connections between astrocytes and the edge of the astrocytic lamina. We caused a similar event in the lamina by incubating explanted mouse eyes with an enzyme. Disruption of the astrocyte connections to the edge of their tissue caused the tissue to stretch more when we increased the eye-pressure, compared to the control tissue. This work is the first on the tissue of the optic nerve to demonstrate the importance of cell connections in preventing the over-stretching of the astrocytic lamina.
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Affiliation(s)
- Arina Korneva
- Glaucoma Center of Excellence, Johns Hopkins Wilmer Eye Institute, United States; Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, MD 21218, United States.
| | - Elizabeth C Kimball
- Glaucoma Center of Excellence, Johns Hopkins Wilmer Eye Institute, United States.
| | - Sarah Quillen
- Glaucoma Center of Excellence, Johns Hopkins Wilmer Eye Institute, United States.
| | - Joan L Jefferys
- Glaucoma Center of Excellence, Johns Hopkins Wilmer Eye Institute, United States.
| | - Manasi Nawathe
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, United States.
| | - Yik Tung Tracy Ling
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, United States.
| | - Thao D Nguyen
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, MD 21218, United States; Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, United States; Department of Materials Science, Johns Hopkins University, Baltimore, MD 21218, United States.
| | - Harry A Quigley
- Glaucoma Center of Excellence, Johns Hopkins Wilmer Eye Institute, United States; Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, MD 21218, United States.
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Kimball E, Schaub J, Quillen S, Keuthan C, Pease ME, Korneva A, Quigley H. The role of aquaporin-4 in optic nerve head astrocytes in experimental glaucoma. PLoS One 2021; 16:e0244123. [PMID: 33529207 PMCID: PMC7853498 DOI: 10.1371/journal.pone.0244123] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/11/2021] [Indexed: 02/04/2023] Open
Abstract
PURPOSE To study aquaporin channel expression in astrocytes of the mouse optic nerve (ON) and the response to IOP elevation in mice lacking aquaporin 4 (AQP4 null). METHODS C57BL/6 (B6) and AQP4 null mice were exposed to bead-induced IOP elevation for 3 days (3D-IOP), 1 and 6 weeks. Mouse ocular tissue sections were immunolabeled against aquaporins 1(AQP1), 4(AQP4), and 9(AQP9). Ocular tissue was imaged to identify normal AQP distribution, ON changes, and axon loss after IOP elevation. Ultrastructure examination, cell proliferation, gene expression, and transport block were also analyzed. RESULTS B6 mice had abundant AQP4 expression in Müller cells, astrocytes of retina and myelinated ON (MON), but minimal AQP4in prelaminar and unmyelinated ON (UON). MON of AQP4 nulls had smaller ON area, smaller axon diameter, higher axon density, and larger proportionate axon area than B6 (all p≤0.05). Bead-injection led to comparable 3D-IOP elevation (p = 0.42) and axonal transport blockade in both strains. In B6, AQP4 distribution was unchanged after 3D-IOP. At baseline, AQP1 and AQP9 were present in retina, but not in UON and this was unaffected after IOP elevation in both strains. In 3D-IOP mice, ON astrocytes and microglia proliferated, more in B6 than AQP4 null. After 6 week IOP elevation, axon loss occurred equally in the two mouse types (24.6%, AQP4 null vs. 23.3%, B6). CONCLUSION Lack of AQP4 was neither protective nor detrimental to the effects of IOP elevation. The minimal presence of AQP4 in UON may be a vital aspect of the regionally specific phenotype of astrocytes in the mouse optic nerve head.
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Affiliation(s)
- Elizabeth Kimball
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Julie Schaub
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Sarah Quillen
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Casey Keuthan
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Mary Ellen Pease
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Arina Korneva
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Harry Quigley
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
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Korneva A, Kimball EC, Jefferys JL, Quigley HA, Nguyen TD. Biomechanics of the optic nerve head and peripapillary sclera in a mouse model of glaucoma. J R Soc Interface 2020; 17:20200708. [PMID: 33323053 PMCID: PMC7811579 DOI: 10.1098/rsif.2020.0708] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 11/17/2020] [Indexed: 01/09/2023] Open
Abstract
The deformation of the mouse astrocytic lamina (AL) and adjacent peripapillary sclera (PPS) was measured in response to elevated intraocular pressure. We subjected explanted mouse eyes to inflation testing, comparing control eyes to those 3 days and 6 weeks after induction of ocular hypertension (OHT) via ocular microbead injection. Laser scanning microscopy was used with second harmonic generation to image the collagenous PPS and two-photon fluorescence to image transgenic fluorescent astrocytes in the AL. Digital volume correlation was applied to calculate strains in the PPS and AL. The specimen-averaged strains were biaxial in the AL and PPS, with greater strain overall in the x- than y-direction in the AL and greater strain in the θ- than the r-direction in the PPS. Strains increased after 3-day OHT, with greater strain overall in the 3-day AL than control AL, and greater circumferential strain in the 3-day PPS than control PPS. In the 6-week OHT eyes, AL and PPS strains were similar overall to controls. This experimental glaucoma model demonstrated a dynamic change in the mechanical behaviour of the AL and PPS over time at the site of neuronal injury and remodelling in glaucoma.
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Affiliation(s)
- Arina Korneva
- Glaucoma Center of Excellence, Wilmer Eye Institute, John Hopkins University, Baltimore, MD, USA
| | - Elizabeth C. Kimball
- Glaucoma Center of Excellence, Wilmer Eye Institute, John Hopkins University, Baltimore, MD, USA
| | - Joan L. Jefferys
- Glaucoma Center of Excellence, Wilmer Eye Institute, John Hopkins University, Baltimore, MD, USA
| | - Harry A. Quigley
- Glaucoma Center of Excellence, Wilmer Eye Institute, John Hopkins University, Baltimore, MD, USA
| | - Thao D. Nguyen
- Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Ophthalmology, The Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Materials Science, The Johns Hopkins University, Baltimore, MD 21218, USA
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Li G, Wang M, Caulk AW, Cilfone NA, Gujja S, Qin L, Chen PY, Chen Z, Yousef S, Jiao Y, He C, Jiang B, Korneva A, Bersi MR, Wang G, Liu X, Mehta S, Geirsson A, Gulcher JR, Chittenden TW, Simons M, Humphrey JD, Tellides G. Chronic mTOR activation induces a degradative smooth muscle cell phenotype. J Clin Invest 2020; 130:1233-1251. [PMID: 32039915 DOI: 10.1172/jci131048] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 12/03/2019] [Indexed: 01/01/2023] Open
Abstract
Smooth muscle cell (SMC) proliferation has been thought to limit the progression of thoracic aortic aneurysm and dissection (TAAD) because loss of medial cells associates with advanced disease. We investigated effects of SMC proliferation in the aortic media by conditional disruption of Tsc1, which hyperactivates mTOR complex 1. Consequent SMC hyperplasia led to progressive medial degeneration and TAAD. In addition to diminished contractile and synthetic functions, fate-mapped SMCs displayed increased proteolysis, endocytosis, phagocytosis, and lysosomal clearance of extracellular matrix and apoptotic cells. SMCs acquired a limited repertoire of macrophage markers and functions via biogenesis of degradative organelles through an mTOR/β-catenin/MITF-dependent pathway, but were distinguishable from conventional macrophages by an absence of hematopoietic lineage markers and certain immune effectors even in the context of hyperlipidemia. Similar mTOR activation and induction of a degradative SMC phenotype in a model of mild TAAD due to Fbn1 mutation greatly worsened disease with near-uniform lethality. The finding of increased lysosomal markers in medial SMCs from clinical TAAD specimens with hyperplasia and matrix degradation further supports the concept that proliferation of degradative SMCs within the media causes aortic disease, thus identifying mTOR-dependent phenotypic modulation as a therapeutic target for combating TAAD.
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Affiliation(s)
- Guangxin Li
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA.,Department of Breast and Thyroid Surgery, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - Mo Wang
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Alexander W Caulk
- Department of Biomedical Engineering, Yale School of Engineering and Applied Science, New Haven, Connecticut, USA
| | - Nicholas A Cilfone
- Computational Statistics and Bioinformatics Group, Advanced Artificial Intelligence Research Laboratory, WuXi NextCODE, Cambridge, Massachusetts, USA
| | - Sharvari Gujja
- Computational Statistics and Bioinformatics Group, Advanced Artificial Intelligence Research Laboratory, WuXi NextCODE, Cambridge, Massachusetts, USA
| | - Lingfeng Qin
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | | | - Zehua Chen
- Computational Statistics and Bioinformatics Group, Advanced Artificial Intelligence Research Laboratory, WuXi NextCODE, Cambridge, Massachusetts, USA
| | - Sameh Yousef
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Yang Jiao
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Changshun He
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Bo Jiang
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Arina Korneva
- Department of Biomedical Engineering, Yale School of Engineering and Applied Science, New Haven, Connecticut, USA
| | - Matthew R Bersi
- Department of Biomedical Engineering, Yale School of Engineering and Applied Science, New Haven, Connecticut, USA
| | | | - Xinran Liu
- Cell Biology, Yale School of Medicine, New Haven, Connecticut, USA.,Center for Cellular and Molecular Imaging, EM Core Facility, Yale School of Medicine, New Haven, Connecticut, USA
| | | | - Arnar Geirsson
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA.,Program in Vascular Biology and Therapeutics, Yale School of Medicine, New Haven, Connecticut, USA
| | - Jeffrey R Gulcher
- Computational Statistics and Bioinformatics Group, Advanced Artificial Intelligence Research Laboratory, WuXi NextCODE, Cambridge, Massachusetts, USA
| | - Thomas W Chittenden
- Computational Statistics and Bioinformatics Group, Advanced Artificial Intelligence Research Laboratory, WuXi NextCODE, Cambridge, Massachusetts, USA
| | - Michael Simons
- Internal Medicine.,Program in Vascular Biology and Therapeutics, Yale School of Medicine, New Haven, Connecticut, USA
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale School of Engineering and Applied Science, New Haven, Connecticut, USA.,Program in Vascular Biology and Therapeutics, Yale School of Medicine, New Haven, Connecticut, USA
| | - George Tellides
- Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA.,Program in Vascular Biology and Therapeutics, Yale School of Medicine, New Haven, Connecticut, USA.,Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
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9
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Quillen S, Schaub J, Quigley H, Pease M, Korneva A, Kimball E. Astrocyte responses to experimental glaucoma in mouse optic nerve head. PLoS One 2020; 15:e0238104. [PMID: 32822415 PMCID: PMC7442264 DOI: 10.1371/journal.pone.0238104] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 08/10/2020] [Indexed: 12/20/2022] Open
Abstract
PURPOSE To delineate responses of optic nerve head astrocytes to sustained intraocular pressure (IOP) elevation in mice. METHODS We elevated IOP for 1 day to 6 weeks by intracameral microbead injection in 4 strains of mice. Astrocyte alterations were studied by transmission electron microscopy (TEM) including immunogold molecular localization, and by laser scanning microscopy (LSM) with immunofluorescence for integrin β1, α-dystroglycan, and glial fibrillary acidic protein (GFAP). Astrocyte proliferation and apoptosis were quantified by Ki67 and TUNEL labeling, respectively. RESULTS Astrocytes in normal optic nerve head expressed integrin β1 and α-dystroglycan by LSM and TEM immunogold labeling at electron dense junctional complexes that were found only on cell membrane zones bordering their basement membranes (BM) at the peripapillary sclera (PPS) and optic nerve head capillaries. At 1-3 days after IOP elevation, abnormal extracellular spaces appeared between astrocytes near PPS, and axonal vesical and mitochondrial accumulation indicated axonal transport blockade. By 1 week, abnormal spaces increased, new collagen formation occurred, and astrocytes separated from their BM, leaving cell membrane fragments. Electron dense junctional complexes separated or were absent at the BM. Astrocyte proliferation was modest during the first week, while only occasional apoptotic astrocytes were observed by TEM and TUNEL. CONCLUSIONS Astrocytes normally exhibit junctions with their BM which are disrupted by extended IOP elevation. Responses include reorientation of cell processes, new collagen formation, and cell proliferation.
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Affiliation(s)
- Sarah Quillen
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Julie Schaub
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Harry Quigley
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Mary Pease
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Arina Korneva
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Elizabeth Kimball
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
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Korneva A, Schaub J, Jefferys J, Kimball E, Pease M, Nawathe M, Johnson TV, Pitha I, Quigley H. Response to letter from Dr. Casson et al. regarding "A method to quantify regional axonal transport blockade...". Exp Eye Res 2020; 197:108075. [DOI: 10.1016/j.exer.2020.108075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022]
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11
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Korneva A, Schaub J, Jefferys J, Kimball E, Pease ME, Nawathe M, Johnson TV, Pitha I, Quigley H. A method to quantify regional axonal transport blockade at the optic nerve head after short term intraocular pressure elevation in mice. Exp Eye Res 2020; 196:108035. [PMID: 32353427 PMCID: PMC7335019 DOI: 10.1016/j.exer.2020.108035] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/28/2020] [Accepted: 04/08/2020] [Indexed: 01/07/2023]
Abstract
Axonal transport blockade is an initial step in retinal ganglion cell (RGC) degeneration in glaucoma and targeting maintenance of normal axonal transport could confer neuroprotection. We present an objective, quantitative method for assessing axonal transport blockade in mouse glaucoma models. Intraocular pressure (IOP) was elevated unilaterally in CD1 mice for 3 days using intracameral microbead injection. Longitudinal sections of optic nerve head (ONH) were immunofluorescently labeled for myelin basic protein (MBP) and amyloid precursor protein (APP), which is transported predominantly orthograde by neurons. The beginning of the myelin transition zone, visualized with the MBP label, was more posterior with elevated IOP, 288.8 ± 40.9 μm, compared to normotensive control eyes, 228.7 ± 32.7 μm (p = 0.030, N = 6 pairs). Glaucomatous regional APP accumulations in retina, prelaminar ONH, unmyelinated ONH, and myelinated optic nerve were identified by objective qualification of pixels with fluorescent intensity greater than the 97.5th percentile value of control eyes (suprathreshold pixels). This method segregated images with APP blockade from those with normal transport of APP. The fraction of suprathreshold pixels was significantly higher following IOP elevation than in normotensive controls in the unmyelinated ONH and myelinated nerve regions (paired analyses, p = 0.02 and 0.003, respectively, N = 12), but not in retina or prelaminar ONH (p = 0.91 and 0.08, respectively). The mean intensity of suprathreshold pixels was also significantly greater in glaucoma than in normotensive controls in prelaminar ONH, unmyelinated ONH and myelinated optic nerve (p = 0.01, 0.01, 0.002, respectively). Using this method, subconjunctival glyceraldehyde, which is known to worsen long-term RGC loss with IOP elevation, also produced greater APP blockade, but not statistically significant compared to glaucoma alone. Systemic losartan, which aids RGC axonal survival in glaucoma, reduced APP blockade, but not statistically significant compared to glaucoma alone. The method provides a short-term assessment of axonal injury for use in initial tests of neuroprotective therapies that may beneficially affect RGC transport in animal models of glaucoma.
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Affiliation(s)
- Arina Korneva
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Julie Schaub
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Joan Jefferys
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Elizabeth Kimball
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Mary Ellen Pease
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Manasi Nawathe
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Thomas V Johnson
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ian Pitha
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Harry Quigley
- From the Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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12
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Abstract
Intramural cells are responsible for establishing, maintaining, and restoring the functional capability and structural integrity of the aortic wall. In response to hypertensive loading, these cells tend to increase wall content via extracellular matrix turnover in an attempt to return wall stress and/or material stiffness toward homeostatic values despite the elevated pressure. Using a common rodent model of induced hypertension, we found marked mouse-to-mouse differences in thoracic aortic remodeling over 2-4 wk of pressure elevation, with mechanoadaptation in some but gross maladaptation in most mice despite the same experimental conditions and overall genetic background. Consistent with our hypothesis, we also found a strong correlation between maladaptive aortic remodeling and a dysfunctional ability of the vessel to vasoconstrict, with maladaptation often evidenced by marked adventitial fibrosis. Remarkably, mouse-to-mouse variability did not correlate with the degree or duration of pressure elevation over the 2- to 4-wk study period. These findings suggest both a need to study together the structure, mechanical properties, and function across layers of the wall when assessing aortic health and a need for caution in using common statistical comparisons across small seemingly well-defined groups that may mask important underlying individual responses, an area of investigation that demands increasing attention as we move toward an era of precision diagnosis and patient care. NEW & NOTEWORTHY There are three primary findings. Marked mouse-to-mouse differences exist in large vessel hypertensive remodeling in an otherwise equivalent cohort of animals. The degree of maladaptation correlates strongly with decreases in smooth muscle contractile capacity. Finally, short-term maladaptive remodeling is independent of the precise degree or duration of the pressure elevation provided that thresholds are exceeded. Therapeutic targets should thus be personalized and focus on both layer-to-layer interactions and early interventions.
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Affiliation(s)
- Arina Korneva
- Department of Biomedical Engineering, Yale University , New Haven, Connecticut
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University , New Haven, Connecticut.,Vascular Biology and Therapeutics Program, Yale School of Medicine , New Haven, Connecticut
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13
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Laroumanie F, Korneva A, Bersi MR, Alexander MR, Xiao L, Zhong X, Van Beusecum JP, Chen Y, Saleh MA, McMaster WG, Gavulic KA, Dale BL, Zhao S, Guo Y, Shyr Y, Perrien DS, Cox NJ, Curci JA, Humphrey JD, Madhur MS. LNK deficiency promotes acute aortic dissection and rupture. JCI Insight 2018; 3:122558. [PMID: 30333305 DOI: 10.1172/jci.insight.122558] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 08/30/2018] [Indexed: 11/17/2022] Open
Abstract
Aortic dissection (AD) is a life-threatening vascular disease with limited treatment strategies. Here, we show that loss of the GWAS-identified SH2B3 gene, encoding lymphocyte adaptor protein LNK, markedly increases susceptibility to acute AD and rupture in response to angiotensin (Ang) II infusion. As early as day 3 following Ang II infusion, prior to the development of AD, Lnk-/- aortas display altered mechanical properties, increased elastin breaks, collagen thinning, enhanced neutrophil accumulation, and increased MMP-9 activity compared with WT mice. Adoptive transfer of Lnk-/- leukocytes into Rag1-/- mice induces AD and rupture in response to Ang II, demonstrating that LNK deficiency in hematopoietic cells plays a key role in this disease. Interestingly, treatment with doxycycline prevents the early accumulation of aortic neutrophils and significantly reduces the incidence of AD and rupture. PrediXcan analysis in a biobank of more than 23,000 individuals reveals that decreased expression of SH2B3 is significantly associated with increased frequency of AD-related phenotypes (odds ratio 0.81). Thus, we identified a role for LNK in the pathology of AD in experimental animals and humans and describe a new model that can be used to inform both inherited and acquired forms of this disease.
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Affiliation(s)
- Fanny Laroumanie
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | - Arina Korneva
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA
| | - Matthew R Bersi
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA.,Department of Biomedical Engineering, Vanderbilt University (VU), Nashville, Tennessee, USA
| | | | - Liang Xiao
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | | | - Justin P Van Beusecum
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | - Yuhan Chen
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | - Mohamed A Saleh
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | | | - Kyle A Gavulic
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | - Bethany L Dale
- Department of Molecular Physiology and Biophysics, VU, Nashville, Tennessee, USA
| | | | | | | | - Daniel S Perrien
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA.,Vanderbilt Center for Bone Biology, and
| | | | - John A Curci
- Division of Vascular Surgery, VUMC, Nashville, Tennessee, USA
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA
| | - Meena S Madhur
- Division of Clinical Pharmacology, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA.,Division of Cardiovascular Medicine.,Division of Vascular Surgery, VUMC, Nashville, Tennessee, USA
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14
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Korneva A, Zilberberg L, Rifkin DB, Humphrey JD, Bellini C. Absence of LTBP-3 attenuates the aneurysmal phenotype but not spinal effects on the aorta in Marfan syndrome. Biomech Model Mechanobiol 2018; 18:261-273. [PMID: 30306291 DOI: 10.1007/s10237-018-1080-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/18/2018] [Indexed: 02/07/2023]
Abstract
Fibrillin-1 is an elastin-associated glycoprotein that contributes to the long-term fatigue resistance of elastic fibers as well as to the bioavailability of transforming growth factor-beta (TGFβ) in arteries. Altered TGFβ bioavailability and/or signaling have been implicated in aneurysm development in Marfan syndrome (MFS), a multi-system condition resulting from mutations to the gene that encodes fibrillin-1. We recently showed that the absence of the latent transforming growth factor-beta binding protein-3 (LTBP-3) in fibrillin-1-deficient mice attenuates the fragmentation of elastic fibers and focal dilatations that are characteristic of aortic root aneurysms in MFS mice, at least to 12 weeks of age. Here, we show further that the absence of LTBP-3 in this MFS mouse model improves the circumferential mechanical properties of the thoracic aorta, which appears to be fundamental in preventing or significantly delaying aneurysm development. Yet, a spinal deformity either remains or is exacerbated in the absence of LTBP-3 and seems to adversely affect the axial mechanical properties of the thoracic aorta, thus decreasing overall vascular function despite the absence of aneurysmal dilatation. Importantly, because of the smaller size of mice lacking LTBP-3, allometric scaling facilitates proper interpretation of aortic dimensions and thus the clinical phenotype. While this study demonstrates that LTBP-3/TGFβ directly affects the biomechanical function of the thoracic aorta, it highlights that spinal deformities in MFS might indirectly and adversely affect the overall aortic phenotype. There is a need, therefore, to consider together the vascular and skeletal effects in this syndromic disease.
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Affiliation(s)
- A Korneva
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - L Zilberberg
- Departments of Cell Biology and Medicine, New York University, New York, NY, USA
| | - D B Rifkin
- Departments of Cell Biology and Medicine, New York University, New York, NY, USA
| | - J D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
- Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT, USA
| | - C Bellini
- Department of Bioengineering, Northeastern University, Boston, MA, USA.
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15
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laroumanie F, Saleh MA, Xiao L, Dale BL, Gavulic KA, Korneva A, Bersi MR, Humphrey JD, Madhur MS. Loss of Lymphocyte Adaptor Protein LNK Predisposes to Acute Aortic Dissection. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.845.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Liang Xiao
- Vanderbilt University Medical CenterNashvilleTN
| | | | | | - Arina Korneva
- Department of Biomedical EngineeringYale UniversityNew HavenCT
| | | | - Jay D. Humphrey
- Department of Biomedical EngineeringYale UniversityNew HavenCT
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16
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Jiao Y, Li G, Korneva A, Caulk AW, Qin L, Bersi MR, Li Q, Li W, Mecham RP, Humphrey JD, Tellides G. Deficient Circumferential Growth Is the Primary Determinant of Aortic Obstruction Attributable to Partial Elastin Deficiency. Arterioscler Thromb Vasc Biol 2017; 37:930-941. [PMID: 28254817 DOI: 10.1161/atvbaha.117.309079] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 02/17/2017] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Williams syndrome is characterized by obstructive aortopathy attributable to heterozygous loss of ELN, the gene encoding elastin. Lesions are thought to result primarily from excessive smooth muscle cell (SMC) proliferation and consequent medial expansion, although an initially smaller caliber and increased stiffness of the aorta may contribute to luminal narrowing. The relative contributions of such abnormalities to the obstructive phenotype had not been defined. APPROACH AND RESULTS We quantified determinants of luminal stenosis in thoracic aortas of Eln-/- mice incompletely rescued by human ELN. Moderate obstruction was largely because of deficient circumferential growth, most prominently of ascending segments, despite increased axial growth. Medial thickening was evident in these smaller diameter elastin-deficient aortas, with medial area similar to that of larger diameter control aortas. There was no difference in cross-sectional SMC number between mutant and wild-type genotypes at multiple stages of postnatal development. Decreased elastin content was associated with medial fibrosis and reduced aortic distensibility because of increased structural stiffness but preserved material stiffness. Elastin-deficient SMCs exhibited greater contractile-to-proliferative phenotypic modulation in vitro than in vivo. We confirmed increased medial collagen without evidence of increased medial area or SMC number in a small ascending aorta with thickened media of a Williams syndrome subject. CONCLUSIONS Deficient circumferential growth is the predominant mechanism for moderate obstructive aortic disease resulting from partial elastin deficiency. Our findings suggest that diverse aortic manifestations in Williams syndrome result from graded elastin content, and SMC hyperplasia causing medial expansion requires additional elastin loss superimposed on ELN haploinsufficiency.
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Affiliation(s)
- Yang Jiao
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Guangxin Li
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Arina Korneva
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Alexander W Caulk
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Lingfeng Qin
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Matthew R Bersi
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Qingle Li
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Wei Li
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Robert P Mecham
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - Jay D Humphrey
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.)
| | - George Tellides
- From the Department of Surgery, Yale University School of Medicine, New Haven, CT (Y.J., G.L., L.Q., Q.L., W.L., G.T.); Department of Vascular Surgery, Peking University People's Hospital, Beijing, People's Republic of China (Y.J., Q.L., W.L.); Department of Vascular Surgery, The First Hospital of China Medical University, Shenyang, People's Republic of China (G.L.); Department of Biomedical Engineering, Yale University, New Haven, CT (A.K., A.W.C., M.R.B., J.D.H.); Department of Cell Biology, Washington University School of Medicine, St Louis, MO (R.P.M.); Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine (J.D.H., G.T.); and Veterans Affairs Connecticut Healthcare System, West Haven (G.T.).
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17
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Bellini C, Korneva A, Zilberberg L, Ramirez F, Rifkin D, Humphrey J. Differential ascending and descending aortic mechanics parallel aneurysmal propensity in a mouse model of Marfan syndrome. J Biomech 2016; 49:2383-2389. [PMID: 26755343 PMCID: PMC4917480 DOI: 10.1016/j.jbiomech.2015.11.059] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 11/13/2015] [Indexed: 12/18/2022]
Abstract
Marfan syndrome (MFS) is a multi-system connective tissue disorder that results from mutations to the gene that codes the elastin-associated glycoprotein fibrillin-1. Although elastic fibers are compromised throughout the arterial tree, the most severe phenotype manifests in the ascending aorta. By comparing biaxial mechanics of the ascending and descending thoracic aorta in a mouse model of MFS, we show that aneurysmal propensity correlates well with both a marked increase in circumferential material stiffness and an increase in intramural shear stress despite a near maintenance of circumferential stress. This finding is corroborated via a comparison of the present results with previously reported findings for both the carotid artery from the same mouse model of MFS and for the thoracic aorta from another model of elastin-associated glycoprotein deficiency that does not predispose to thoracic aortic aneurysms. We submit that the unique biaxial loading of the ascending thoracic aorta conspires with fibrillin-1 deficiency to render this aortic segment vulnerable to aneurysm and rupture.
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Affiliation(s)
- C. Bellini
- Department of Biomedical Engineering Yale University, New Haven, CT, USA
| | - A. Korneva
- Department of Biomedical Engineering Yale University, New Haven, CT, USA
| | - L. Zilberberg
- Departments of Cell Biology and Medicine New York University, New York, NY, USA
| | - F. Ramirez
- Department of Pharmacology and Systems Therapeutics Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - D.B. Rifkin
- Departments of Cell Biology and Medicine New York University, New York, NY, USA
| | - J.D. Humphrey
- Department of Biomedical Engineering Yale University, New Haven, CT, USA
- Vascular Biology and Therapeutics Program Yale School of Medicine, New Haven, CT, USA
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