1
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Nasim S, Bichsel C, Dayneka S, Mannix R, Holm A, Vivero M, Alexandrescu S, Pinto A, Greene AK, Ingber DE, Bischoff J. MRC1 and LYVE1 expressing macrophages in vascular beds of GNAQ p.R183Q driven capillary malformations in Sturge Weber syndrome. Acta Neuropathol Commun 2024; 12:47. [PMID: 38532508 DOI: 10.1186/s40478-024-01757-4] [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: 01/05/2024] [Accepted: 03/06/2024] [Indexed: 03/28/2024] Open
Abstract
Sturge-Weber syndrome (SWS), a neurocutaneous disorder, is characterized by capillary malformations (CM) in the skin, brain, and eyes. Patients may suffer from seizures, strokes, and glaucoma, and only symptomatic treatment is available. CM are comprised of enlarged vessels with endothelial cells (ECs) and disorganized mural cells. Our recent finding indicated that the R183Q mutation in ECs leads to heightened signaling through phospholipase Cβ3 and protein kinase C, leading to increased angiopoietin-2 (ANGPT2). Furthermore, knockdown of ANGPT2, a crucial mediator of pro-angiogenic signaling, inflammation, and vascular remodeling, in EC-R183Q rescued the enlarged vessel phenotype in vivo. This prompted us to look closer at the microenvironment in CM-affected vascular beds. We analyzed multiple brain histological sections from patients with GNAQ-R183Q CM and found enlarged vessels devoid of mural cells along with increased macrophage-like cells co-expressing MRC1 (CD206, a mannose receptor), CD163 (a scavenger receptor and marker of the monocyte/macrophage lineage), CD68 (a pan macrophage marker), and LYVE1 (a lymphatic marker expressed by some macrophages). These macrophages were not found in non-SWS control brain sections. To investigate the mechanism of increased macrophages in the perivascular environment, we examined THP1 (monocytic/macrophage cell line) cell adhesion to EC-R183Q versus EC-WT under static and laminar flow conditions. First, we observed increased THP1 cell adhesion to EC-R183Q compared to EC-WT under static conditions. Next, using live cell imaging, we found THP1 cell adhesion to EC-R183Q was dramatically increased under laminar flow conditions and could be inhibited by anti-ICAM1. ICAM1, an endothelial cell adhesion molecule required for leukocyte adhesion, was strongly expressed in the endothelium in SWS brain histological sections, suggesting a mechanism for recruitment of macrophages. In conclusion, our findings demonstrate that macrophages are an important component of the perivascular environment in CM suggesting they may contribute to the CM formation and SWS disease progression.
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Affiliation(s)
- Sana Nasim
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
- Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Colette Bichsel
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
- Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
- CSEM SA, Hegenheimermattweg 167 A, 4123, Allschwil, Switzerland
| | - Stephen Dayneka
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Robert Mannix
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Annegret Holm
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
- Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Mathew Vivero
- Department of Plastic & Oral Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Sanda Alexandrescu
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Anna Pinto
- Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Arin K Greene
- Department of Plastic & Oral Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Donald E Ingber
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02215, USA
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02139, USA
| | - Joyce Bischoff
- Vascular Biology Program, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.
- Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.
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2
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Burdick K, Lee L, Mannix R, Monuteaux M, Hirsh M, Fleegler E. 260EMF Racial and Ethnic Disparities in Access to Pediatric Trauma Centers in the United States. Ann Emerg Med 2021. [DOI: 10.1016/j.annemergmed.2021.09.273] [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] [Indexed: 11/16/2022]
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3
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Herland A, Maoz BM, FitzGerald EA, Grevesse T, Vidoudez C, Sheehy SP, Budnik N, Dauth S, Mannix R, Budnik B, Parker KK, Ingber DE. Proteomic and Metabolomic Characterization of Human Neurovascular Unit Cells in Response to Methamphetamine. ACTA ACUST UNITED AC 2020; 4:e1900230. [PMID: 32744807 DOI: 10.1002/adbi.201900230] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 07/02/2020] [Indexed: 01/31/2023]
Abstract
The functional state of the neurovascular unit (NVU), composed of the blood-brain barrier and the perivasculature that forms a dynamic interface between the blood and the central nervous system (CNS), plays a central role in the control of brain homeostasis and is strongly affected by CNS drugs. Human primary brain microvascular endothelium, astrocyte, pericyte, and neural cell cultures are often used to study NVU barrier functions as well as drug transport and efficacy; however, the proteomic and metabolomic responses of these different cell types are not well characterized. Culturing each cell type separately, using deep coverage proteomic analysis and characterization of the secreted metabolome, as well as measurements of mitochondrial activity, the responses of these cells under baseline conditions and when exposed to the NVU-impairing stimulant methamphetamine (Meth) are analyzed. These studies define the previously unknown metabolic and proteomic profiles of human brain pericytes and lead to improved characterization of the phenotype of each of the NVU cell types as well as cell-specific metabolic and proteomic responses to Meth.
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Affiliation(s)
- Anna Herland
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Division of Micro and Nanosystems, KTH Royal Institute of Technology, Stockholm, 10044, Sweden.,AIMES, Center for the Advancement of Integrated Engineering and Medical Sciences, Department of Neuroscience, Karolinska Institute, Stockholm, 17177, Sweden
| | - Ben M Maoz
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.,Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 6997801, Israel.,Department of Biomedical Engineering, Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Edward A FitzGerald
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Thomas Grevesse
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Charles Vidoudez
- Small Molecule Mass Spectrometry Facility, Harvard University, Cambridge, MA, 02138, USA
| | - Sean P Sheehy
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Nikita Budnik
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Stephanie Dauth
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Bogdan Budnik
- Mass Spectrometry and Proteomics Resource Laboratory, Harvard University, Cambridge, MA, 02138, USA
| | - Kevin Kit Parker
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.,Vascular Biology Program and Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.,Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
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4
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Novak R, Ingram M, Marquez S, Das D, Delahanty A, Herland A, Maoz BM, Jeanty SSF, Somayaji MR, Burt M, Calamari E, Chalkiadaki A, Cho A, Choe Y, Chou DB, Cronce M, Dauth S, Divic T, Fernandez-Alcon J, Ferrante T, Ferrier J, FitzGerald EA, Fleming R, Jalili-Firoozinezhad S, Grevesse T, Goss JA, Hamkins-Indik T, Henry O, Hinojosa C, Huffstater T, Jang KJ, Kujala V, Leng L, Mannix R, Milton Y, Nawroth J, Nestor BA, Ng CF, O'Connor B, Park TE, Sanchez H, Sliz J, Sontheimer-Phelps A, Swenor B, Thompson G, Touloumes GJ, Tranchemontagne Z, Wen N, Yadid M, Bahinski A, Hamilton GA, Levner D, Levy O, Przekwas A, Prantil-Baun R, Parker KK, Ingber DE. Robotic fluidic coupling and interrogation of multiple vascularized organ chips. Nat Biomed Eng 2020; 4:407-420. [PMID: 31988458 DOI: 10.1038/s41551-019-0497-x] [Citation(s) in RCA: 206] [Impact Index Per Article: 51.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 11/25/2019] [Indexed: 02/08/2023]
Abstract
Organ chips can recapitulate organ-level (patho)physiology, yet pharmacokinetic and pharmacodynamic analyses require multi-organ systems linked by vascular perfusion. Here, we describe an 'interrogator' that employs liquid-handling robotics, custom software and an integrated mobile microscope for the automated culture, perfusion, medium addition, fluidic linking, sample collection and in situ microscopy imaging of up to ten organ chips inside a standard tissue-culture incubator. The robotic interrogator maintained the viability and organ-specific functions of eight vascularized, two-channel organ chips (intestine, liver, kidney, heart, lung, skin, blood-brain barrier and brain) for 3 weeks in culture when intermittently fluidically coupled via a common blood substitute through their reservoirs of medium and endothelium-lined vascular channels. We used the robotic interrogator and a physiological multicompartmental reduced-order model of the experimental system to quantitatively predict the distribution of an inulin tracer perfused through the multi-organ human-body-on-chips. The automated culture system enables the imaging of cells in the organ chips and the repeated sampling of both the vascular and interstitial compartments without compromising fluidic coupling.
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Affiliation(s)
- Richard Novak
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Miles Ingram
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Susan Marquez
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Debarun Das
- CFD Research Corporation, Huntsville, AL, USA
| | - Aaron Delahanty
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Anna Herland
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Division of Micro and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Ben M Maoz
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Department of Biomedical Engineering and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Sauveur S F Jeanty
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | | | - Morgan Burt
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Elizabeth Calamari
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Angeliki Chalkiadaki
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | | | - Youngjae Choe
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - David Benson Chou
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Department of Pathology, Massachusetts General Hospital, Boston, MA, USA
| | - Michael Cronce
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Stephanie Dauth
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Toni Divic
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Jose Fernandez-Alcon
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Thomas Ferrante
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - John Ferrier
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Edward A FitzGerald
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Rachel Fleming
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Sasan Jalili-Firoozinezhad
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Thomas Grevesse
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Josue A Goss
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Tiama Hamkins-Indik
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Olivier Henry
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Chris Hinojosa
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Tessa Huffstater
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Kyung-Jin Jang
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Ville Kujala
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Lian Leng
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, USA
| | - Yuka Milton
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Janna Nawroth
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Bret A Nestor
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Carlos F Ng
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Blakely O'Connor
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Tae-Eun Park
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Henry Sanchez
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Josiah Sliz
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Alexandra Sontheimer-Phelps
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Department of Biology, University of Freiburg, Freiburg, Germany
| | - Ben Swenor
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Guy Thompson
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - George J Touloumes
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | | | - Norman Wen
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Moran Yadid
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Anthony Bahinski
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,GlaxoSmithKline, Collegeville, PA, USA
| | - Geraldine A Hamilton
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Daniel Levner
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Emulate, Inc., Boston, MA, USA
| | - Oren Levy
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | | | - Rachelle Prantil-Baun
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA
| | - Kevin K Parker
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA.,Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, USA. .,Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, USA. .,Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
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5
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Park TE, Mustafaoglu N, Herland A, Hasselkus R, Mannix R, FitzGerald EA, Prantil-Baun R, Watters A, Henry O, Benz M, Sanchez H, McCrea HJ, Goumnerova LC, Song HW, Palecek SP, Shusta E, Ingber DE. Hypoxia-enhanced Blood-Brain Barrier Chip recapitulates human barrier function and shuttling of drugs and antibodies. Nat Commun 2019; 10:2621. [PMID: 31197168 DOI: 10.1101/482463v1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 05/16/2019] [Indexed: 05/21/2023] Open
Abstract
The high selectivity of the human blood-brain barrier (BBB) restricts delivery of many pharmaceuticals and therapeutic antibodies to the central nervous system. Here, we describe an in vitro microfluidic organ-on-a-chip BBB model lined by induced pluripotent stem cell-derived human brain microvascular endothelium interfaced with primary human brain astrocytes and pericytes that recapitulates the high level of barrier function of the in vivo human BBB for at least one week in culture. The endothelium expresses high levels of tight junction proteins and functional efflux pumps, and it displays selective transcytosis of peptides and antibodies previously observed in vivo. Increased barrier functionality was accomplished using a developmentally-inspired induction protocol that includes a period of differentiation under hypoxic conditions. This enhanced BBB Chip may therefore represent a new in vitro tool for development and validation of delivery systems that transport drugs and therapeutic antibodies across the human BBB.
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Affiliation(s)
- Tae-Eun Park
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
- Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 44919, Republic of Korea
| | - Nur Mustafaoglu
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Anna Herland
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
- Division of Micro and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
- Swedish Medical Nanoscience Center, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Ryan Hasselkus
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
- Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Edward A FitzGerald
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Rachelle Prantil-Baun
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Alexander Watters
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Olivier Henry
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Maximilian Benz
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Henry Sanchez
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA
| | - Heather J McCrea
- Department of Neurosurgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | | | - Hannah W Song
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Sean P Palecek
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Eric Shusta
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA, 02115, USA.
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.
- Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.
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6
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Howell D, Mannix R, Gardner A, Iverson G, Meehan W. The effect of sex and age on dual-task performance following a concussion. J Sci Med Sport 2018. [DOI: 10.1016/j.jsams.2018.09.092] [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] [Indexed: 10/28/2022]
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7
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Maoz BM, Herland A, FitzGerald EA, Grevesse T, Vidoudez C, Pacheco AR, Sheehy SP, Park TE, Dauth S, Mannix R, Budnik N, Shores K, Cho A, Nawroth JC, Segrè D, Budnik B, Ingber DE, Parker KK. A linked organ-on-chip model of the human neurovascular unit reveals the metabolic coupling of endothelial and neuronal cells. Nat Biotechnol 2018; 36:865-874. [PMID: 30125269 PMCID: PMC9254231 DOI: 10.1038/nbt.4226] [Citation(s) in RCA: 253] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 07/20/2018] [Indexed: 12/30/2022]
Abstract
The neurovascular unit (NVU) regulates metabolic homeostasis as well as drug pharmacokinetics and pharmacodynamics in the central nervous system. Metabolic fluxes and conversions over the NVU rely on interactions between brain microvascular endothelium, perivascular pericytes, astrocytes and neurons, making it difficult to identify the contributions of each cell type. Here we model the human NVU using microfluidic organ chips, allowing analysis of the roles of individual cell types in NVU functions. Three coupled chips model influx across the blood-brain barrier (BBB), the brain parenchymal compartment and efflux across the BBB. We used this linked system to mimic the effect of intravascular administration of the psychoactive drug methamphetamine and to identify previously unknown metabolic coupling between the BBB and neurons. Thus, the NVU system offers an in vitro approach for probing transport, efficacy, mechanism of action and toxicity of neuroactive drugs.
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Affiliation(s)
- Ben M Maoz
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
- Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- The Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, Israel
| | - Anna Herland
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
- Department of Micro and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
- Swedish Medical Nanoscience Center, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Edward A FitzGerald
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Thomas Grevesse
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Charles Vidoudez
- Small Molecule Mass Spectrometry Facility, Harvard University, Cambridge, Massachusetts, USA
| | - Alan R Pacheco
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
- Graduate Program in Bioinformatics and Biological Design Center, Boston University, Boston, Massachusetts, USA
| | - Sean P Sheehy
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Tae-Eun Park
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Stephanie Dauth
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
- Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Nikita Budnik
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
| | - Kevin Shores
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Alexander Cho
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Janna C Nawroth
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
| | - Daniel Segrè
- Graduate Program in Bioinformatics and Biological Design Center, Boston University, Boston, Massachusetts, USA
- Department of Biology, Department of Biomedical Engineering, Department of Physics, Boston University, Boston, Massachusetts, USA
| | - Bogdan Budnik
- Mass Spectrometry and Proteomics Resource Laboratory, Harvard University, Cambridge, Massachusetts, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
- Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
| | - Kevin Kit Parker
- Disease Biophysics Group, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA
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8
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Maoz BM, Herland A, Henry OYF, Leineweber WD, Yadid M, Doyle J, Mannix R, Kujala VJ, FitzGerald EA, Parker KK, Ingber DE. Organs-on-Chips with combined multi-electrode array and transepithelial electrical resistance measurement capabilities. Lab Chip 2017; 17:2294-2302. [PMID: 28608907 DOI: 10.1039/c7lc00412e] [Citation(s) in RCA: 142] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Here we demonstrate that microfluidic cell culture devices, known as Organs-on-a-Chips can be fabricated with multifunctional, real-time, sensing capabilities by integrating both multi-electrode arrays (MEAs) and electrodes for transepithelial electrical resistance (TEER) measurements into the chips during their fabrication. To prove proof-of-concept, simultaneous measurements of cellular electrical activity and tissue barrier function were carried out in a dual channel, endothelialized, heart-on-a-chip device containing human cardiomyocytes and a channel-separating porous membrane covered with a primary human endothelial cell monolayer. These studies confirmed that the TEER-MEA chip can be used to simultaneously detect dynamic alterations of vascular permeability and cardiac function in the same chip when challenged with the inflammatory stimulus tumor necrosis factor alpha (TNF-α) or the cardiac targeting drug isoproterenol. Thus, this Organ Chip with integrated sensing capability may prove useful for real-time assessment of biological functions, as well as response to therapeutics.
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Affiliation(s)
- Ben M Maoz
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Anna Herland
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA.
| | - Olivier Y F Henry
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA.
| | - William D Leineweber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA.
| | - Moran Yadid
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - John Doyle
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Ville J Kujala
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Edward A FitzGerald
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA.
| | - Kevin Kit Parker
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA and Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
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9
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Papa AL, Korin N, Kanapathipillai M, Mammoto A, Mammoto T, Jiang A, Mannix R, Uzun O, Johnson C, Bhatta D, Cuneo G, Ingber DE. Ultrasound-sensitive nanoparticle aggregates for targeted drug delivery. Biomaterials 2017; 139:187-194. [PMID: 28618348 DOI: 10.1016/j.biomaterials.2017.06.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [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: 12/26/2016] [Revised: 05/25/2017] [Accepted: 06/03/2017] [Indexed: 12/22/2022]
Abstract
Here we describe injectable, ultrasound (US)-responsive, nanoparticle aggregates (NPAs) that disintegrate into slow-release, nanoscale, drug delivery systems, which can be targeted to selective sites by applying low-energy US locally. We show that, unlike microbubble based drug carriers which may suffer from stability problems, the properties of mechanical activated NPAs, composed of polymer nanoparticles, can be tuned by properly adjusting the polymer molecular weight, the size of the nanoparticle precursors as well as the percentage of excipient utilized to hold the NPA together. We then apply this concept to practice by fabricating NPAs composed of nanoparticles loaded with Doxorubicin (Dox) and tested their ability to treat tumors via ultrasound activation. Mouse studies demonstrated significantly increased efficiency of tumor targeting of the US-activated NPAs compared to PLGA nanoparticle controls (with or without US applied) or intact NPAs. Importantly, when the Dox-loaded NPAs were injected and exposed to US energy locally, this increased ability to concentrate nanoparticles at the tumor site resulted in a significantly greater reduction in tumor volume compared to tumors treated with a 20-fold higher dose of the free drug.
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Affiliation(s)
- Anne-Laure Papa
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Netanel Korin
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | | | - Akiko Mammoto
- Vascular Biology Program and Dept. of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Tadanori Mammoto
- Vascular Biology Program and Dept. of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Amanda Jiang
- Vascular Biology Program and Dept. of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Robert Mannix
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA; Vascular Biology Program and Dept. of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Oktay Uzun
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Christopher Johnson
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Deen Bhatta
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Garry Cuneo
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA; Vascular Biology Program and Dept. of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA; Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
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10
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Kanapathipillai M, Mammoto A, Mammoto T, Kang JH, Jiang E, Ghosh K, Korin N, Gibbs A, Mannix R, Ingber DE. Inhibition of mammary tumor growth using lysyl oxidase-targeting nanoparticles to modify extracellular matrix. Nano Lett 2012; 12:3213-3217. [PMID: 22554317 DOI: 10.1021/nl301206p] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A cancer nanotherapeutic has been developed that targets the extracellular matrix (ECM)-modifying enzyme lysyl oxidase (LOX) and alters the ECM structure. Poly(d,l-lactide-co-glycolide) nanoparticles (∼220 nm) coated with a LOX inhibitory antibody bind to ECM and suppress mammary cancer cell growth and invasion in vitro as well as tumor expansion in vivo, with greater efficiency than soluble anti-LOX antibody. This nanomaterials approach opens a new path for treating cancer with higher efficacy and decreased side effects.
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Affiliation(s)
- Mathumai Kanapathipillai
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02115, United States
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11
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Mammoto T, Mammoto A, Torisawa YS, Tat T, Gibbs A, Derda R, Mannix R, de Bruijn M, Yung CW, Huh D, Ingber DE. Mechanochemical control of mesenchymal condensation and embryonic tooth organ formation. Dev Cell 2011; 21:758-69. [PMID: 21924961 DOI: 10.1016/j.devcel.2011.07.006] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2011] [Revised: 05/28/2011] [Accepted: 07/11/2011] [Indexed: 12/24/2022]
Abstract
Mesenchymal condensation is critical for organogenesis, yet little is known about how this process is controlled. Here we show that Fgf8 and Sema3f, produced by early dental epithelium, respectively, attract and repulse mesenchymal cells, which cause them to pack tightly together during mouse tooth development. Resulting mechanical compaction-induced changes in cell shape induce odontogenic transcription factors (Pax9, Msx1) and a chemical cue (BMP4), and mechanical compression of mesenchyme is sufficient to induce tooth-specific cell fate switching. The inductive effects of cell compaction are mediated by suppression of the mechanical signaling molecule RhoA, and its overexpression prevents odontogenic induction. Thus, the mesenchymal condensation that drives tooth formation is induced by antagonistic epithelial morphogens that manifest their pattern-generating actions mechanically via changes in mesenchymal cell shape and altered mechanotransduction.
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Affiliation(s)
- Tadanori Mammoto
- Vascular Biology Program, Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
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12
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Matthews BD, Overby DR, Mannix R, Ingber DE. Cellular adaptation to mechanical stress: role of integrins, Rho, cytoskeletal tension and mechanosensitive ion channels. J Cell Sci 2006; 119:508-18. [PMID: 16443749 DOI: 10.1242/jcs.02760] [Citation(s) in RCA: 318] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
To understand how cells sense and adapt to mechanical stress, we applied tensional forces to magnetic microbeads bound to cell-surface integrin receptors and measured changes in bead displacement with sub-micrometer resolution using optical microscopy. Cells exhibited four types of mechanical responses: (1) an immediate viscoelastic response; (2) early adaptive behavior characterized by pulse-to-pulse attenuation in response to oscillatory forces; (3) later adaptive cell stiffening with sustained (>15 second) static stresses; and (4) a large-scale repositioning response with prolonged (>1 minute) stress. Importantly, these adaptation responses differed biochemically. The immediate and early responses were affected by chemically dissipating cytoskeletal prestress (isometric tension), whereas the later adaptive response was not. The repositioning response was prevented by inhibiting tension through interference with Rho signaling, similar to the case of the immediate and early responses, but it was also prevented by blocking mechanosensitive ion channels or by inhibiting Src tyrosine kinases. All adaptive responses were suppressed by cooling cells to 4 degrees C to slow biochemical remodeling. Thus, cells use multiple mechanisms to sense and respond to static and dynamic changes in the level of mechanical stress applied to integrins.
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Affiliation(s)
- Benjamin D Matthews
- Vascular Biology Program, Departments of Pathology and Surgery, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
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13
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Lee P, Goishi K, Davidson AJ, Mannix R, Zon L, Klagsbrun M. Neuropilin-1 is required for vascular development and is a mediator of VEGF-dependent angiogenesis in zebrafish. Proc Natl Acad Sci U S A 2002; 99:10470-5. [PMID: 12142468 PMCID: PMC124944 DOI: 10.1073/pnas.162366299] [Citation(s) in RCA: 152] [Impact Index Per Article: 6.9] [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: 03/15/2002] [Accepted: 06/19/2002] [Indexed: 01/13/2023] Open
Abstract
Neuropilin-1 (NRP1) is a cell-surface receptor for both vascular endothelial growth factor(165) (VEGF(165)) and class 3 semaphorins that is expressed by neurons and endothelial cells. NRP1 is required for normal developmental angiogenesis in mice. The zebrafish is an excellent system for analyzing vascular development. Zebrafish intersegmental vessels correspond to mammalian capillary sprouts, whereas the axial vessels correspond to larger blood vessels, such as arteries. The zebrafish NRP1 gene (znrp1) was isolated and when overexpressed in cells, zNRP1 protein was a functional receptor for human VEGF(165). Whole-mount in situ hybridization showed that transcripts for znrp1 during embryonic and early larval development were detected mainly in neuronal and vascular tissues. Morpholino-mediated knockdown of zNRP1 in embryos resulted in vascular defects, most notably impaired circulation in the intersegmental vessels. Circulation via trunk axial vessels was not affected. Embryos treated with VEGF receptor-2 kinase inhibitor had a similar intersegmental vessel defect suggesting that knockdown of zNRP1 reduces VEGF activity. To determine whether NRP1 and VEGF activities were interdependent in vivo, zNRP1 and VEGF morpholinos were coinjected into embryos at concentrations that individually did not significantly inhibit blood vessel development. The result was a potent inhibition of blood cell circulation via both intersegmental and axial vessels demonstrating that VEGF and NRP1 act synergistically to promote a functional circulatory system. These results provide the first physiological demonstration that NRP1 regulates angiogenesis through a VEGF-dependent pathway.
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Affiliation(s)
- Percy Lee
- Department of Surgical Research, Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
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14
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Wang N, Naruse K, Stamenović D, Fredberg JJ, Mijailovich SM, Tolić-Nørrelykke IM, Polte T, Mannix R, Ingber DE. Mechanical behavior in living cells consistent with the tensegrity model. Proc Natl Acad Sci U S A 2001; 98:7765-70. [PMID: 11438729 PMCID: PMC35416 DOI: 10.1073/pnas.141199598] [Citation(s) in RCA: 410] [Impact Index Per Article: 17.8] [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] [Indexed: 11/18/2022] Open
Abstract
Alternative models of cell mechanics depict the living cell as a simple mechanical continuum, porous filament gel, tensed cortical membrane, or tensegrity network that maintains a stabilizing prestress through incorporation of discrete structural elements that bear compression. Real-time microscopic analysis of cells containing GFP-labeled microtubules and associated mitochondria revealed that living cells behave like discrete structures composed of an interconnected network of actin microfilaments and microtubules when mechanical stresses are applied to cell surface integrin receptors. Quantitation of cell tractional forces and cellular prestress by using traction force microscopy confirmed that microtubules bear compression and are responsible for a significant portion of the cytoskeletal prestress that determines cell shape stability under conditions in which myosin light chain phosphorylation and intracellular calcium remained unchanged. Quantitative measurements of both static and dynamic mechanical behaviors in cells also were consistent with specific a priori predictions of the tensegrity model. These findings suggest that tensegrity represents a unified model of cell mechanics that may help to explain how mechanical behaviors emerge through collective interactions among different cytoskeletal filaments and extracellular adhesions in living cells.
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Affiliation(s)
- N Wang
- Physiology Program, Harvard School of Public Health, Boston, MA 02115, USA
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