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Protzmann J, Jung F, Jakobsson L, Fredriksson L. Analysis of ischemic stroke-mediated effects on blood-brain barrier properties along the arteriovenous axis assessed by intravital two-photon imaging. Fluids Barriers CNS 2024; 21:35. [PMID: 38622710 PMCID: PMC11017501 DOI: 10.1186/s12987-024-00537-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 04/03/2024] [Indexed: 04/17/2024] Open
Abstract
Early breach of the blood-brain barrier (BBB) and consequently extravasation of blood-borne substances into the brain parenchyma is a common hallmark of ischemic stroke. Although BBB breakdown is associated with an increased risk of cerebral hemorrhage and poor clinical prognosis, the cause and mechanism of this process are largely unknown. The aim of this study was to establish an imaging and analysis protocol which enables investigation of the dynamics of BBB breach in relation to hemodynamic properties along the arteriovenous axis. Using longitudinal intravital two-photon imaging following photothrombotic induction of ischemic stroke through a cranial window, we were able to study the response of the cerebral vasculature to ischemia, from the early critical hours to the days/weeks after the infarct. We demonstrate that disruption of the BBB and hemodynamic parameters, including perturbed blood flow, can be studied at single-vessel resolution in the three-dimensional space as early as 30 min after vessel occlusion. Further, we show that this protocol permits longitudinal studies on the response of individual blood vessels to ischemia over time, thus enabling detection of (maladaptive) vascular remodeling such as intussusception, angiogenic sprouting and entanglement of vessel networks. Taken together, this in vivo two-photon imaging and analysis protocol will be useful in future studies investigating the molecular and cellular mechanisms, and the spatial contribution, of BBB breach to disease progression which might ultimately aid the development of new and more precise treatment strategies for ischemic stroke.
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Affiliation(s)
- Jil Protzmann
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institutet, Solnavägen 9, Stockholm, Sweden, 17165
| | - Felix Jung
- Department of Neuroscience , Karolinska Institutet, Solnavägen 9, Stockholm, Sweden, 17165
| | - Lars Jakobsson
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institutet, Solnavägen 9, Stockholm, Sweden, 17165
| | - Linda Fredriksson
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institutet, Solnavägen 9, Stockholm, Sweden, 17165.
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Yang D, Ortinau L, Jeong Y, Park D. Advances and challenges in intravital imaging of craniofacial and dental progenitor cells. Genesis 2022; 60:e23498. [PMID: 35980285 PMCID: PMC10015615 DOI: 10.1002/dvg.23498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 11/11/2022]
Abstract
Craniofacial and appendicular bone homeostasis is dynamically regulated by a balance between bone formation and resorption by osteoblasts and osteoclasts, respectively. Despite the developments in multiple imaging techniques in bone biology, there are still technical challenges and limitations in the investigation of spatial/anatomical location of rare stem/progenitor cells and their molecular regulation in tooth and craniofacial bones of living animals. Recent advances in live animal imaging techniques for the craniofacial and dental apparatus can provide new insights in real time into bone stem/progenitor cell dynamics and function in vivo. Here, we review the current inventions and applications of the noninvasive intravital imaging technique and its practical uses and limitations in the analysis of stem/progenitor cells in craniofacial and dental apparatus in vivo. Furthermore, we also explore the potential applications of intravital microscopy in the dental field.
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Affiliation(s)
- Dongwook Yang
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Laura Ortinau
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Youngjae Jeong
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Dongsu Park
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA.,Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA
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3
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Chico TJA, Kugler EC. Cerebrovascular development: mechanisms and experimental approaches. Cell Mol Life Sci 2021; 78:4377-4398. [PMID: 33688979 PMCID: PMC8164590 DOI: 10.1007/s00018-021-03790-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 02/04/2021] [Accepted: 02/12/2021] [Indexed: 12/13/2022]
Abstract
The cerebral vasculature plays a central role in human health and disease and possesses several unique anatomic, functional and molecular characteristics. Despite their importance, the mechanisms that determine cerebrovascular development are less well studied than other vascular territories. This is in part due to limitations of existing models and techniques for visualisation and manipulation of the cerebral vasculature. In this review we summarise the experimental approaches used to study the cerebral vessels and the mechanisms that contribute to their development.
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Affiliation(s)
- Timothy J A Chico
- Department of Infection, Immunity and Cardiovascular Disease, Medical School, University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK.
- The Bateson Centre, Firth Court, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK.
- Insigneo Institute for in Silico Medicine, The Pam Liversidge Building, Sheffield, S1 3JD, UK.
| | - Elisabeth C Kugler
- Department of Infection, Immunity and Cardiovascular Disease, Medical School, University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK.
- The Bateson Centre, Firth Court, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK.
- Insigneo Institute for in Silico Medicine, The Pam Liversidge Building, Sheffield, S1 3JD, UK.
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Xiong Y, Scerbo MJ, Seelig A, Volta F, O'Brien N, Dicker A, Padula D, Lickert H, Gerdes JM, Berggren PO. Islet vascularization is regulated by primary endothelial cilia via VEGF-A-dependent signaling. eLife 2020; 9:56914. [PMID: 33200981 PMCID: PMC7695455 DOI: 10.7554/elife.56914] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 11/16/2020] [Indexed: 12/31/2022] Open
Abstract
Islet vascularization is essential for intact islet function and glucose homeostasis. We have previously shown that primary cilia directly regulate insulin secretion. However, it remains unclear whether they are also implicated in islet vascularization. At eight weeks, murine Bbs4-/-islets show significantly lower intra-islet capillary density with enlarged diameters. Transplanted Bbs4-/- islets exhibit delayed re-vascularization and reduced vascular fenestration after engraftment, partially impairing vascular permeability and glucose delivery to β-cells. We identified primary cilia on endothelial cells as the underlying cause of this regulation, via the vascular endothelial growth factor-A (VEGF-A)/VEGF receptor 2 (VEGFR2) pathway. In vitro silencing of ciliary genes in endothelial cells disrupts VEGF-A/VEGFR2 internalization and downstream signaling. Consequently, key features of angiogenesis including proliferation and migration are attenuated in human BBS4 silenced endothelial cells. We conclude that endothelial cell primary cilia regulate islet vascularization and vascular barrier function via the VEGF-A/VEGFR2 signaling pathway.
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Affiliation(s)
- Yan Xiong
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska University Hospital L1, Stockholm, Sweden
| | - M Julia Scerbo
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany
| | - Anett Seelig
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany
| | - Francesco Volta
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany.,Technical University Munich, Munich, Germany
| | - Nils O'Brien
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany
| | - Andrea Dicker
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska University Hospital L1, Stockholm, Sweden
| | - Daniela Padula
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany
| | - Heiko Lickert
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany.,Technical University Munich, Munich, Germany.,Deutsches Zentrum für Diabetesforschung, DZD, Munich, Germany
| | - Jantje Mareike Gerdes
- Institute for Diabetes and Regeneration Research, Helmholtz Zentrum München, Neuherberg, Germany.,Deutsches Zentrum für Diabetesforschung, DZD, Munich, Germany
| | - Per-Olof Berggren
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska University Hospital L1, Stockholm, Sweden
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Francipane MG, Han B, Lagasse E. Host Lymphotoxin-β Receptor Signaling Is Crucial for Angiogenesis of Metanephric Tissue Transplanted into Lymphoid Sites. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:252-269. [PMID: 31585070 PMCID: PMC6943804 DOI: 10.1016/j.ajpath.2019.08.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 08/09/2019] [Accepted: 08/20/2019] [Indexed: 12/16/2022]
Abstract
The mouse lymph node (LN) can provide a niche to grow metanephric kidney to maturity. Here, we show that signaling through the lymphotoxin-β receptor (LTβR) is critical for kidney organogenesis both in the LN and the omentum. By transplanting kidney rudiments either in the LNs of mice undergoing LTβR antagonist treatment or in the omenta of Ltbr knockout (Ltbr-/-) mice, the host LTβR signals were found to be crucial for obtaining a well-vascularized kidney graft. Indeed, defective LTβR signaling correlated with decreased expression of endothelial and angiogenic markers in kidney grafts as well as structural alterations. Because the number of glomerular endothelial cells expressing the LTβR target nuclear factor κB-inducing kinase (NIK) decreased in the absence of a functional LTβR, it was speculated that an LTβR/NIK axis mediated the angiogenetic signals required for successful ectopic kidney organogenesis, given the established role of NIK in neovascularization. However, the transplantation of kidney rudiments in omenta of Nik-/- mice revealed that NIK is dispensable for ectopic kidney vascular integration and maturation. Finally, defective LTβR signaling impaired compensatory glomerular adaptation to renal mass reduction, indicating that kidney regeneration approaches, besides whole kidney reconstruction, might benefit from the presence of LTβR signals.
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Affiliation(s)
- Maria Giovanna Francipane
- McGowan Institute for Regenerative Medicine and Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania; Ri.MED Foundation, Palermo, Italy.
| | - Bing Han
- McGowan Institute for Regenerative Medicine and Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Eric Lagasse
- McGowan Institute for Regenerative Medicine and Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania.
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