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Correa KCS, Facchinatto WM, Habitzreuter FB, Ribeiro GH, Rodrigues LG, Micocci KC, Campana-Filho SP, Colnago LA, Souza DHF. Activity of a Recombinant Chitinase of the Atta sexdens Ant on Different Forms of Chitin and Its Fungicidal Effect against Lasiodiplodia theobromae. Polymers (Basel) 2024; 16:529. [PMID: 38399907 PMCID: PMC10892911 DOI: 10.3390/polym16040529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/09/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024] Open
Abstract
This study evaluates the activity of a recombinant chitinase from the leaf-cutting ant Atta sexdens (AsChtII-C4B1) against colloidal and solid α- and β-chitin substrates. 1H NMR analyses of the reaction media showed the formation of N-acetylglucosamine (GlcNAc) as the hydrolysis product. Viscometry analyses revealed a reduction in the viscosity of chitin solutions, indicating that the enzyme decreases their molecular masses. Both solid state 13C NMR and XRD analyses showed minor differences in chitin crystallinity pre- and post-reaction, indicative of partial hydrolysis under the studied conditions, resulting in the formation of GlcNAc and a reduction in molecular mass. However, the enzyme was unable to completely degrade the chitin samples, as they retained most of their solid-state structure. It was also observed that the enzyme acts progressively and with a greater activity on α-chitin than on β-chitin. AsChtII-C4B1 significantly changed the hyphae of the phytopathogenic fungus Lasiodiplodia theobromae, hindering its growth in both solid and liquid media and reducing its dry biomass by approximately 61%. The results demonstrate that AsChtII-C4B1 could be applied as an agent for the bioproduction of chitin derivatives and as a potential antifungal agent.
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Affiliation(s)
- Katia Celina Santos Correa
- Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, Brazil; (K.C.S.C.); (L.G.R.); (K.C.M.)
| | - William Marcondes Facchinatto
- Aveiro Institute of Materials, CICECO, Department of Chemistry, University of Aveiro, St. Santiago, 3810-193 Aveiro, Portugal;
| | - Filipe Biagioni Habitzreuter
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Ave. Trabalhador Sao-carlense 400, 13560-590 Sao Carlos, Brazil; (F.B.H.); (S.P.C.-F.)
| | - Gabriel Henrique Ribeiro
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, St. XV de Novembro 1452, 13560-970 Sao Carlos, Brazil; (G.H.R.); (L.A.C.)
| | - Lucas Gomes Rodrigues
- Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, Brazil; (K.C.S.C.); (L.G.R.); (K.C.M.)
| | - Kelli Cristina Micocci
- Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, Brazil; (K.C.S.C.); (L.G.R.); (K.C.M.)
| | - Sérgio Paulo Campana-Filho
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Ave. Trabalhador Sao-carlense 400, 13560-590 Sao Carlos, Brazil; (F.B.H.); (S.P.C.-F.)
| | - Luiz Alberto Colnago
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, St. XV de Novembro 1452, 13560-970 Sao Carlos, Brazil; (G.H.R.); (L.A.C.)
| | - Dulce Helena Ferreira Souza
- Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, Brazil; (K.C.S.C.); (L.G.R.); (K.C.M.)
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Collignon A, Dion-Albert L, Ménard C, Coelho-Santos V. Sex, hormones and cerebrovascular function: from development to disorder. Fluids Barriers CNS 2024; 21:2. [PMID: 38178239 PMCID: PMC10768274 DOI: 10.1186/s12987-023-00496-3] [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: 08/11/2023] [Accepted: 11/29/2023] [Indexed: 01/06/2024] Open
Abstract
Proper cerebrovascular development and neurogliovascular unit assembly are essential for brain growth and function throughout life, ensuring the continuous supply of nutrients and oxygen. This involves crucial events during pre- and postnatal stages through key pathways, including vascular endothelial growth factor (VEGF) and Wnt signaling. These pathways are pivotal for brain vascular growth, expansion, and blood-brain barrier (BBB) maturation. Interestingly, during fetal and neonatal life, cerebrovascular formation coincides with the early peak activity of the hypothalamic-pituitary-gonadal axis, supporting the idea of sex hormonal influence on cerebrovascular development and barriergenesis.Sex hormonal dysregulation in early development has been implicated in neurodevelopmental disorders with highly sexually dimorphic features, such as autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD). Both disorders show higher prevalence in men, with varying symptoms between sexes, with boys exhibiting more externalizing behaviors, such as aggressivity or hyperactivity, and girls displaying higher internalizing behaviors, including anxiety, depression, or attention disorders. Indeed, ASD and ADHD are linked to high prenatal testosterone exposure and reduced aromatase expression, potentially explaining sex differences in prevalence and symptomatology. In line with this, high estrogen levels seem to attenuate ADHD symptoms. At the cerebrovascular level, sex- and region-specific variations of cerebral blood flow perfusion have been reported in both conditions, indicating an impact of gonadal hormones on the brain vascular system, disrupting its ability to respond to neuronal demands.This review aims to provide an overview of the existing knowledge concerning the impact of sex hormones on cerebrovascular formation and maturation, as well as the onset of neurodevelopmental disorders. Here, we explore the concept of gonadal hormone interactions with brain vascular and BBB development to function, with a particular focus on the modulation of VEGF and Wnt signaling. We outline how these pathways may be involved in the underpinnings of ASD and ADHD. Outstanding questions and potential avenues for future research are highlighted, as uncovering sex-specific physiological and pathological aspects of brain vascular development might lead to innovative therapeutic approaches in the context of ASD, ADHD and beyond.
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Affiliation(s)
- Adeline Collignon
- Department of Psychiatry & Neuroscience and CERVO Brain Research Center, Universite Laval, Quebec City, Canada
| | - Laurence Dion-Albert
- Department of Psychiatry & Neuroscience and CERVO Brain Research Center, Universite Laval, Quebec City, Canada
| | - Caroline Ménard
- Department of Psychiatry & Neuroscience and CERVO Brain Research Center, Universite Laval, Quebec City, Canada
| | - Vanessa Coelho-Santos
- Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra, Coimbra, Portugal.
- University of Coimbra, Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), Coimbra, Portugal.
- Faculty of Medicine, University of Coimbra, Institute of Physiology, Coimbra, Portugal.
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Tan Z, Hall P, Costin A, Crawford SA, Ramm G, Wong CHY, Kitching AR, Hickey MJ. Removal of the endothelial surface layer via hyaluronidase does not modulate monocyte and neutrophil interactions with the glomerular endothelium. Microcirculation 2023; 30:e12823. [PMID: 37494581 PMCID: PMC10909409 DOI: 10.1111/micc.12823] [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: 05/25/2023] [Revised: 07/13/2023] [Accepted: 07/14/2023] [Indexed: 07/28/2023]
Abstract
OBJECTIVE The endothelial surface layer (ESL), a layer of macromolecules on the surface of endothelial cells, can both impede and facilitate leukocyte recruitment. However, its role in monocyte and neutrophil recruitment in glomerular capillaries is unknown. METHODS We used multiphoton intravital microscopy to examine monocyte and neutrophil behavior in the glomerulus following ESL disruption with hyaluronidase. RESULTS Constitutive retention and migration of monocytes and neutrophils within the glomerular microvasculature was unaltered by hyaluronidase. Consistent with this, inhibition of the hyaluronan-binding molecule CD44 also failed to modulate glomerular trafficking of these immune cells. To investigate the contribution of the ESL during acute inflammation, we induced glomerulonephritis via in situ immune complex deposition. This resulted in increases in glomerular retention of monocytes and neutrophils but did not induce marked reduction in the glomerular ESL. Furthermore, hyaluronidase treatment did not modify the prolonged retention of monocytes and neutrophils in the acutely inflamed glomerular microvasculature. CONCLUSIONS These observations indicate that, despite evidence that the ESL has the capacity to inhibit leukocyte-endothelial cell interactions while also containing adhesive ligands for immune cells, neither of these functions modulate trafficking of monocytes and neutrophils in steady-state or acutely-inflamed glomeruli.
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Affiliation(s)
- ZheHao Tan
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - Pam Hall
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - Adam Costin
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Simon A. Crawford
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Georg Ramm
- Monash Ramaciotti Centre for Cryo‐Electron MicroscopyMonash UniversityClaytonVictoriaAustralia
| | - Connie H. Y. Wong
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
| | - A. Richard Kitching
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
- Department of NephrologyMonash Medical CentreClaytonVictoriaAustralia
- Department of Pediatric NephrologyMonash Medical CentreClaytonVictoriaAustralia
| | - Michael J. Hickey
- Centre for Inflammatory Diseases, Monash University Department of MedicineMonash Medical CentreClaytonVictoriaAustralia
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Ben-Zvi A, Liebner S. Developmental regulation of barrier- and non-barrier blood vessels in the CNS. J Intern Med 2022; 292:31-46. [PMID: 33665890 DOI: 10.1111/joim.13263] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/01/2021] [Indexed: 12/22/2022]
Abstract
The blood-brain barrier (BBB) is essential for creating and maintaining tissue homeostasis in the central nervous system (CNS), which is key for proper neuronal function. In most vertebrates, the BBB is localized to microvascular endothelial cells that acquire barrier properties during angiogenesis of the neuroectoderm. Complex and continuous tight junctions, and the lack of fenestrae combined with low pinocytotic activity render the BBB endothelium a tight barrier for water-soluble molecules that may only enter the CNS via specific transporters. The differentiation of these unique endothelial properties during embryonic development is initiated by endothelial-specific flavours of the Wnt/β-catenin pathway in a precise spatiotemporal manner. In this review, we summarize the currently known cellular (neural precursor and endothelial cells) and molecular (VEGF and Wnt/β-catenin) mechanisms mediating brain angiogenesis and barrier formation. Moreover, we introduce more recently discovered crosstalk with cellular and acellular elements within the developing CNS such as the extracellular matrix. We discuss recent insights into the downstream molecular mechanisms of Wnt/β-catenin in particular, the recently identified target genes like Foxf2, Foxl2, Foxq1, Lef1, Ppard, Zfp551, Zic3, Sox17, Apcdd1 and Fgfbp1 that are involved in refining and maintaining barrier characteristics in the mature BBB endothelium. Additionally, we elute to recent insight into barrier heterogeneity and differential endothelial barrier properties within the CNS, focussing on the circumventricular organs as well as on the neurogenic niches in the subventricular zone and the hippocampus. Finally, open questions and future BBB research directions are highlighted in the context of taking benefit from understanding BBB development for strategies to modulate BBB function under pathological conditions.
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Affiliation(s)
- A Ben-Zvi
- From the, The Department of Developmental Biology and Cancer Research, Institute for Medical Research IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - S Liebner
- Institute of Neurology (Edinger Institute), University Hospital, Goethe University Frankfurt, Frankfurt am Main, Germany.,Excellence Cluster Cardio-Pulmonary Systems (ECCPS), Partner Site Frankfurt, Frankfurt am Main, Germany.,German Center for Cardiovascular Research (DZHK), Partner Site Rhine-Main, Frankfurt am Main, Germany
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5
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Jiang H, Zhou Y, Nabavi SM, Sahebkar A, Little PJ, Xu S, Weng J, Ge J. Mechanisms of Oxidized LDL-Mediated Endothelial Dysfunction and Its Consequences for the Development of Atherosclerosis. Front Cardiovasc Med 2022; 9:925923. [PMID: 35722128 PMCID: PMC9199460 DOI: 10.3389/fcvm.2022.925923] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 05/13/2022] [Indexed: 01/05/2023] Open
Abstract
Atherosclerosis is an immuno-metabolic disease involving chronic inflammation, oxidative stress, epigenetics, and metabolic dysfunction. There is compelling evidence suggesting numerous modifications including the change of the size, density, and biochemical properties in the low-density lipoprotein (LDL) within the vascular wall. These modifications of LDL, in addition to LDL transcytosis and retention, contribute to the initiation, development and clinical consequences of atherosclerosis. Among different atherogenic modifications of LDL, oxidation represents a primary modification. A series of pathophysiological changes caused by oxidized LDL (oxLDL) enhance the formation of foam cells and atherosclerotic plaques. OxLDL also promotes the development of fatty streaks and atherogenesis through induction of endothelial dysfunction, formation of foam cells, monocyte chemotaxis, proliferation and migration of SMCs, and platelet activation, which culminate in plaque instability and ultimately rupture. This article provides a concise review of the formation of oxLDL, enzymes mediating LDL oxidation, and the receptors and pro-atherogenic signaling pathways of oxLDL in vascular cells. The review also explores how oxLDL functions in different stages of endothelial dysfunction and atherosclerosis. Future targeted pathways and therapies aiming at reducing LDL oxidation and/or lowering oxLDL levels and oxLDL-mediated pro-inflammatory responses are also discussed.
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Affiliation(s)
- Hui Jiang
- Department of Cardiothoracic Surgery, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Yongwen Zhou
- Department of Endocrinology, Institute of Endocrine and Metabolic Diseases, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Clinical Research Hospital of Chinese Academy of Sciences (Hefei), University of Science and Technology of China, Hefei, China
| | | | - Amirhossein Sahebkar
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Peter J. Little
- School of Health and Behavioural Sciences, Sunshine Coast Health Institute, University of the Sunshine Coast, Birtinya, QLD, Australia
| | - Suowen Xu
- Department of Endocrinology, Institute of Endocrine and Metabolic Diseases, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Clinical Research Hospital of Chinese Academy of Sciences (Hefei), University of Science and Technology of China, Hefei, China
- Suowen Xu ; orcid.org/0000-0002-5488-5217
| | - Jianping Weng
- Department of Endocrinology, Institute of Endocrine and Metabolic Diseases, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Clinical Research Hospital of Chinese Academy of Sciences (Hefei), University of Science and Technology of China, Hefei, China
- Jianping Weng ; orcid.org/0000-0002-7889-1697
| | - Jianjun Ge
- Department of Cardiothoracic Surgery, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
- *Correspondence: Jianjun Ge ; orcid.org/0000-0002-9424-6049
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6
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Menaceur C, Gosselet F, Fenart L, Saint-Pol J. The Blood-Brain Barrier, an Evolving Concept Based on Technological Advances and Cell-Cell Communications. Cells 2021; 11:cells11010133. [PMID: 35011695 PMCID: PMC8750298 DOI: 10.3390/cells11010133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 12/27/2021] [Accepted: 12/30/2021] [Indexed: 02/07/2023] Open
Abstract
The construction of the blood–brain barrier (BBB), which is a natural barrier for maintaining brain homeostasis, is the result of a meticulous organisation in space and time of cell–cell communication processes between the endothelial cells that carry the BBB phenotype, the brain pericytes, the glial cells (mainly the astrocytes), and the neurons. The importance of these communications for the establishment, maturation and maintenance of this unique phenotype had already been suggested in the pioneering work to identify and demonstrate the BBB. As for the history of the BBB, the evolution of analytical techniques has allowed knowledge to evolve on the cell–cell communication pathways involved, as well as on the role played by the cells constituting the neurovascular unit in the maintenance of the BBB phenotype, and more particularly the brain pericytes. This review summarises the key points of the history of the BBB, from its origin to the current knowledge of its physiology, as well as the cell–cell communication pathways identified so far during its development, maintenance, and pathophysiological alteration.
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7
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Gilloteaux J, Nicaise C, Sprimont L, Bissler J, Finkelstein JA, Payne WR. Leptin receptor defect with diabetes causes skeletal muscle atrophy in female obese Zucker rats where peculiar depots networked with mitochondrial damages. Ultrastruct Pathol 2021; 45:346-375. [PMID: 34743665 DOI: 10.1080/01913123.2021.1983099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Tibialis anterior muscles of 45-week-old female obese Zucker rats with defective leptin receptor and non-insulin dependent diabetes mellitus (NIDDM) showed a significative atrophy compared to lean muscles, based on histochemical-stained section's measurements in the sequence: oxidative slow twitch (SO, type I) < oxidative fast twitch (FOG, type IIa) < fast glycolytic (FG, type IIb). Both oxidative fiber's outskirts resembled 'ragged' fibers and, in these zones, ultrastructure revealed small clusters of endoplasm-like reticulum filled with unidentified electron contrasted compounds, contiguous and continuous with adjacent mitochondria envelope. The linings appeared crenated stabbed by circular patterns resembling those found of ceramides. The same fibers contained scattered degraded mitochondria that tethered electron contrasted droplets favoring larger depots while mitoptosis were widespread in FG fibers. Based on other interdisciplinary investigations on the lipid depots of diabetes 2 muscles made us to propose these accumulated contrasted contents to be made of peculiar lipids, including acyl-ceramides, as those were only found while diabetes 2 progresses in aging obese rats. These could interfere in NIDDM with mitochondrial oxidative energetic demands and muscle functions.
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Affiliation(s)
- Jacques Gilloteaux
- Department of Anatomical Sciences, St George's University School of Medicine, K B Taylor Global Scholar's Program at the University of Northumbria, School of Health and Life Sciences, Newcastle upon Tyne, UK.,Unité de Recherches de Physiologie Moleculaire (URPHyM) - Narilis, Département de Médecine, Université de Namur, Namur, Belgium.,Department of Anatomy, Northeast Ohio Medical University (Neomed), Rootstown, OH, USA
| | - Charles Nicaise
- Unité de Recherches de Physiologie Moleculaire (URPHyM) - Narilis, Département de Médecine, Université de Namur, Namur, Belgium
| | - Lindsay Sprimont
- Unité de Recherches de Physiologie Moleculaire (URPHyM) - Narilis, Département de Médecine, Université de Namur, Namur, Belgium
| | - John Bissler
- Department of Anatomy, Northeast Ohio Medical University (Neomed), Rootstown, OH, USA.,Division of Nephrology at St. Jude Children's Research Hospital and Le Bonheur Children's Hospital, The University of Tennessee Health Science Center, Memphis, TN, USA
| | - Judith A Finkelstein
- Department of Anatomy, Northeast Ohio Medical University (Neomed), Rootstown, OH, USA
| | - Warren R Payne
- Institute for Sport and Health, Footscray Park Campus, Victoria University, Melbourne, VIC, Australia
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8
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Galán-Ávila A, García-Fortea E, Prohens J, Herraiz FJ. Microgametophyte Development in Cannabis sativa L. and First Androgenesis Induction Through Microspore Embryogenesis. FRONTIERS IN PLANT SCIENCE 2021; 12:669424. [PMID: 34113367 PMCID: PMC8186446 DOI: 10.3389/fpls.2021.669424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
Development of double haploids is an elusive current breeding objective in Cannabis sativa L. We have studied the whole process of anther and pollen grain formation during meiosis, microsporogenesis, and microgametogenesis and correlated the different microgametophyte developmental stages with bud length in plants from varieties USO31 and Finola. We also studied microspore and pollen amyloplast content and studied the effect of a cold pretreatment to excised buds prior to microspore in vitro culture. Up to 476,903 microspores and pollen grains per male flower, with in vivo microspore viability rates from 53.71 to 70.88% were found. A high uniformity in the developmental stage of microspores and pollen grains contained in anthers was observed, and this allowed the identification of bud length intervals containing mostly vacuolate microspores and young bi-cellular pollen grains. The starch presence in C. sativa microspores and pollen grains follows a similar pattern to that observed in species recalcitrant to androgenesis. Although at a low frequency, cold-shock pretreatment applied on buds can deviate the naturally occurring gametophytic pathway toward an embryogenic development. This represents the first report concerning androgenesis induction in C. sativa, which lays the foundations for double haploid research in this species.
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Affiliation(s)
- Alberto Galán-Ávila
- Ploidy and Genomics S.L., Centro Europeo de Empresas Innovadoras de Valencia, Parc Tecnològic, Valencia, Spain
| | - Edgar García-Fortea
- Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Valencia, Spain
| | - Jaime Prohens
- Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Valencia, Spain
| | - Francisco Javier Herraiz
- Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Valencia, Spain
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Anti-Angiogenic Therapy: Albumin-Binding Proteins Could Mediate Mechanisms Underlying the Accumulation of Small Molecule Receptor Tyrosine Kinase Inhibitors in Normal Tissues with Potential Harmful Effects on Health. Diseases 2021; 9:diseases9020028. [PMID: 33920299 PMCID: PMC8167546 DOI: 10.3390/diseases9020028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/06/2021] [Accepted: 04/09/2021] [Indexed: 12/11/2022] Open
Abstract
Anti-angiogenics currently used in cancer therapy target angiogenesis by two major mechanisms: (i) neutralizing angiogenic factors or their receptors by using macromolecule anti-angiogenic drugs (e.g., therapeutic antibodies), and (ii) blocking intracellularly the activity of receptor tyrosine kinases with small molecule (Mr < 1 kDa) inhibitors. Anti-angiogenics halt the growth and spread of cancer, and significantly prolong the disease-free survival of the patients. However, resistance to treatment, insufficient efficacy, and toxicity limit the success of this antivascular therapy. Published evidence suggests that four albumin-binding proteins (ABPs) (gp18, gp30, gp60/albondin, and secreted protein acidic and cysteine-rich (SPARC)) could be responsible for the accumulation of small molecule receptor tyrosine kinase inhibitors (RTKIs) in normal organs and tissues and therefore responsible for the side effects and toxicity associated with this type of cancer therapy. Drawing attention to these studies, this review discusses the possible negative role of albumin as a drug carrier and the rationale for a new strategy for cancer therapy based on follicle-stimulating hormone receptor (FSHR) expressed on the luminal endothelial cell surface of peritumoral blood vessels associated with the major human cancers. This review should be relevant to the audience and the field of cancer therapeutics and angiogenesis/microvascular modulation-based interventions.
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10
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Neuronal regulation of the blood-brain barrier and neurovascular coupling. Nat Rev Neurosci 2020; 21:416-432. [PMID: 32636528 DOI: 10.1038/s41583-020-0322-2] [Citation(s) in RCA: 159] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2020] [Indexed: 12/31/2022]
Abstract
To continuously process neural activity underlying sensation, movement and cognition, the CNS requires a homeostatic microenvironment that is not only enriched in nutrients to meet its high metabolic demands but that is also devoid of toxins that might harm the sensitive neural tissues. This highly regulated microenvironment is made possible by two unique features of CNS vasculature absent in the peripheral organs. First, the blood-blood barrier, which partitions the circulating blood from the CNS, acts as a gatekeeper to facilitate the selective trafficking of substances between the blood and the parenchyma. Second, neurovascular coupling ensures that, following local neural activation, regional blood flow is increased to quickly supply more nutrients and remove metabolic waste. Here, we review how neural and vascular activity act on one another with regard to these two properties.
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11
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Relevance of Microvascular Flow Assessments in Critically Ill Neonates and Children: A Systematic Review. Pediatr Crit Care Med 2020; 21:373-384. [PMID: 31834246 PMCID: PMC10061570 DOI: 10.1097/pcc.0000000000002201] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Resolution of impaired microvascular flow may lag the normalization of macrocirculatory variables. The significance of microcirculatory dysfunction in critically ill children and neonates is unknown, but microcirculatory variables can be measured using Doppler or videomicroscopy imaging techniques. We outline the current understanding of the role of the microcirculation in critical illness, review methods for its assessment, and perform a systematic review of how it has been monitored in critically ill neonates and children. DESIGN Systematic review (PROSPERO CRD42019117993). SETTING Not applicable. SUBJECTS Not applicable. INTERVENTIONS None. MEASUREMENTS AND RESULTS We systematically searched MEDLINE, EMBASE, PubMed, and Web of Science. We included studies of critically ill patients 0 to 18 years old investigating microcirculatory blood flow. Two reviewers analyzed abstracts and articles. Results were qualitatively analyzed due to study heterogeneity. A total of 2,559 abstracts met search criteria, of which 94 underwent full-text review. Of those, 36 met inclusion criteria. Seven studies investigated microcirculatory changes in critically ill children. Twenty studies investigated the microcirculatory changes in neonates with variable diagnoses compared with a diverse set of clinical endpoints. Nine studies assessed the effects of age, sex, and birth weight on microvascular flow in neonates. Across all studies, microcirculatory dysfunction was associated with poor outcomes and may not correlate with observed macrovascular function. CONCLUSIONS Assessment of microvascular flow in critically ill children and neonates is possible, although significant challenges remain. In many such patients, microvascular blood flow is disrupted despite medical management targeting normalized macrovascular variables. Future studies are needed to define normal pediatric microvascular flow variables and to assess the impact of patient and treatment factors on its function.
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12
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Pannekeet MM, Mulder JB, Weening JJ, Struijk DG, Zweers MM, Krediet RT. Demonstration of Aquaporin-Chip in Peritoneal Tissue of Uremic and Capd Patients. Perit Dial Int 2020. [DOI: 10.1177/089686089601601s08] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aquaporin-CHIP is a 28 kD channel forming integral membrane protein. It acts as an osmotically driven, water-selective pore. The presence of aquaporin-CHIP has been demonstrated in the proximal tubule in the kidney and in the pleura, as well as in other tissues. During peritoneal dialysis a dissociation between the transport of water and sodium using hyperosmolar solutions has been reported, suggesting the presence of ultrasmall pores. Water channels, like aquaporin-CHIP, could be the morphological equivalent of these pores.We investigated the possible presence of aquaporinCHIP in cryo-sections of peritoneal tissue using affinity purified human anti-CHIP IgG (P. Agre, Baltimore, MD).Peritoneal biopsies (omenta) were obtained at catheter insertion in 2 uremic patients with end-stage renal disease, and at catheter reimplantation of 1 patient treated with continuous ambulatory peritoneal dialysis (CAPD) for two years. Peritoneal tissue obtained at autopsy from 1 patient who had been on CAPD for four years, but in whom CAPD had been discontinued for five months, was also studied.Aquaporin-CHIP antiserum specific staining was found in the endothelial cells of the peritoneal capillaries in all patients. No obvious difference in the intensity of staining was seen between uremic and CAPD patients.This demonstration of aquaporin-CHIP in human peritoneal endothelial cells supports the hypothesis of the existence of ultrasmall pores within the peritoneal membrane. These water channels facilitate the transcellular transport of water, induced by an osmotic gradient, in the absence of sodium transport. It may be the explanation for the dissociation of water and sodium transport that occurs during hyperosmolar solutions.Aquaporin-CHIP is present in human peritoneal endothelial cells in both uremic and CAPD patients. Aquaporin-CHIP may be the morphological equivalent of the ultrasmall pores within the peritoneal membrane.
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Affiliation(s)
| | - Jos B. Mulder
- Departments of Pathology, Academic Medical Center, Amsterdam
| | - Jan J. Weening
- Departments of Pathology, Academic Medical Center, Amsterdam
| | - Dirk G. Struijk
- Departments of Nephrology, Utrecht, the Netherlands
- Foundation for Home Dialysis Midden en West Nederland, Utrecht, the Netherlands
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Krediet RT, Zemel D, Imholz AL, Koomen GC, Struijk DG, Arisz L. Indices of Peritoneal Permeability and Surface Area. Perit Dial Int 2020. [DOI: 10.1177/089686089301302s06] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
| | | | | | - Gerardus C.M. Koomen
- Department of Medicine1 and Laboratory for Clinical Chemistry, Utrecht, The Netherlands
| | - Dirk G. Struijk
- Renal Unit, Utrecht, The Netherlands
- Academic Medical Center, University of Amsterdam, and Foundation for Home Dialysis Midden-West Nederland, Utrecht, The Netherlands
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15
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Abstract
Objective To analyze the peritoneal transport of serum proteins during continuous ambulatory peritoneal dialysis (CAPD) with icodextrin. Design A comparison was made between CAPD with glucose-based dialysate and, in the same patients, 4 weeks after the instillation of icodextrin for the long night dwell, with icodextrin-based dialysate. Patients Ten stable CAPD patients, who participated in a large randomized multicenter study comparing icodextrin with glucose-based dialysate. Five patients used glucose 1.5% dialysate for the night dwell before its replacement by icodextrin (good ultrafiltration group), and 5 used glucose 4.25% (poor ultrafiltration group). Results The clearance of β2-microglobulin increased by 28% on icodextrin, due to increased convective transport. The clearances of the larger proteins -albumin, IgG, fibronectin, and α2-macroglobulin -remained unaltered, indicating transport of these proteins across the large pore system. The patients with poor ultrafiltration had a higher β2-microglobulin clearance on glucosebased dialysate than the high ultrafiltration group. This indicates that the ultrafiltration failure was caused by a large effective peritoneal surface area, leading to a rapid absorption of glucose. Icodextrin produced significantly more ultrafiltration in the poor ultrafiltration patients than in the high ultrafiltration group. A correlation was found for the β2-microglobulin clearance on glucose-based dialysate and the ultrafiltration produced by icodextrin. Conclusions Icodextrin causes ultrafiltration through the small pore system, whereas glucose-based dialysate has its effect on transcellular water transport. Therefore, the use of icodextrin causes an increased clearance of β2 microglobulin, but not of larger proteins. Icodextrin was especially useful in patients with a large effective surface area leading to ultrafiltration failure during treatment with glucose-based dialysate.
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Affiliation(s)
| | - Colin B. Brown
- Renal Unit, Sheffield Kidney Institute, Northern General Hospital, Sheffield, United Kingdom
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16
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Intraperitoneal Route of Drug Administration: Should it Be Used in Experimental Animal Studies? Pharm Res 2019; 37:12. [PMID: 31873819 DOI: 10.1007/s11095-019-2745-x] [Citation(s) in RCA: 218] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 11/27/2019] [Indexed: 12/12/2022]
Abstract
Intraperitoneal (IP) route of drug administration in laboratory animals is a common practice in many in vivo studies of disease models. While this route is an easy to master, quick, suitable for chronic treatments and with low impact of stress on laboratory rodents, there is a common concern that it may not be an acceptable route for drug administration in experimental studies. The latter is likely due to sparsity of information regarding pharmacokinetics of pharmacological agents and the mechanisms through which agents get systemic exposure after IP administration. In this review, we summarize the main mechanisms involved in bioavailability of IP administered drugs and provide examples of pharmacokinetic profiles for small and large molecules in comparison to other routes of administration. We conclude with a notion that IP administration of drugs in experimental studies involving rodents is a justifiable route for pharmacological and proof-of-concept studies where the goal is to evaluate the effect(s) of target engagement rather than properties of a drug formulation and/or its pharmacokinetics for clinical translation.
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17
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Ayloo S, Gu C. Transcytosis at the blood-brain barrier. Curr Opin Neurobiol 2019; 57:32-38. [PMID: 30708291 DOI: 10.1016/j.conb.2018.12.014] [Citation(s) in RCA: 141] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 12/28/2018] [Indexed: 12/11/2022]
Abstract
The blood-brain barrier (BBB) is a functional interface separating the brain from the circulatory system and is essential for homeostasis of the central nervous system (CNS). The BBB regulates molecular flux to maintain an optimal environment for neuronal function and protects the brain from toxins and pathogens. Endothelial cells forming the walls of CNS blood vessels constitute the BBB. CNS endothelial cells exhibit two features that underlie the restrictive properties of the BBB: specialized tight junctions that prevent paracellular passage between the blood and the brain, and unusually low levels of vesicle trafficking that limit transcellular transport or transcytosis. While the prevailing view in the field was that specialized tight junctions contributed to CNS barrier properties, recent findings have revealed the importance of maintaining low rates of transcytosis at the BBB. It is now clear that suppression of transcytosis at the BBB is an active process and CNS-specific genetic programs inhibit this pathway to maintain a functional barrier.
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Affiliation(s)
- Swathi Ayloo
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA
| | - Chenghua Gu
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA.
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18
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Gilloteaux J, Subramanian K, Solomon N, Nicaise C. The leptin receptor mutation of the obese Zucker rat causes sciatic nerve demyelination with a centripetal pattern defect. Ultrastruct Pathol 2018; 42:377-408. [PMID: 30339059 DOI: 10.1080/01913123.2018.1522405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Young male Zucker rats with a leptin receptor mutation are obese, have a non-insulin-dependent diabetes mellitus (NIDDM), and other endocrinopathies. Tibial branches of the sciatic nerve reveal a progressive demyelination that progresses out of the Schwann cells (SCs) where electron-contrast deposits are accumulated while the minor lines or intermembranous SC contacts display exaggerated spacings. Cajal bands contain diversely contrasted vesicles adjacent to the abaxonal myelin layer with blemishes; they appear dispatched centripetally out of many narrow electron densities, regularly spaced around the myelin annulus. These anomalies widen and yield into sectors across the stacked myelin layers. Throughout the worse degradations, the adaxonal membrane remains along the axonal neuroplasm. This peripheral neuropathy with irresponsive leptin cannot modulate hypothalamic-pituitary-adrenal axis and SC neurosteroids, thus exacerbates NIDDM condition. Additionally, the ultrastructure of the progressive myelin alterations may have unraveled a peculiar, centripetal mode of trafficking maintenance of the peripheral nervous system myelin, while some adhesive glycoproteins remain between myelin layers, somewhat hindering the axon mutilation. Heading title: Peripheral neuropathy and myelin.
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Affiliation(s)
- Jacques Gilloteaux
- a Department of Anatomical Sciences , St George's University School of Medicine, K.B. Taylor Global Scholar's Program at Northumbria University , Newcastle upon Tyne , UK.,b Unité de Recherche en Physiologie Moléculaire (URPhyM), Laboratoire de Neurodégénérescence et Régénération, Département de Médecine , Université de Namur , Namur , Belgium
| | - Kritika Subramanian
- a Department of Anatomical Sciences , St George's University School of Medicine, K.B. Taylor Global Scholar's Program at Northumbria University , Newcastle upon Tyne , UK.,c Department of Clinical and Epidemiological Virology , Rega Institute of Medical Research, Katholiele Universiteit Leuven , Leuven , Belgium
| | - Nadia Solomon
- a Department of Anatomical Sciences , St George's University School of Medicine, K.B. Taylor Global Scholar's Program at Northumbria University , Newcastle upon Tyne , UK
| | - Charles Nicaise
- b Unité de Recherche en Physiologie Moléculaire (URPhyM), Laboratoire de Neurodégénérescence et Régénération, Département de Médecine , Université de Namur , Namur , Belgium
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19
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Abstract
This review by O'Brown et al. discusses the cellular nature of the blood–brain barrier (BBB) and the conservation and variation of BBB function across taxa. It compares the BBB across organisms in order to provide insight into the human BBB both under normal physiological conditions and in neurological diseases. The blood–brain barrier (BBB) restricts free access of molecules between the blood and the brain and is essential for regulating the neural microenvironment. Here, we describe how the BBB was initially characterized and how the current field evaluates barrier properties. We next detail the cellular nature of the BBB and discuss both the conservation and variation of BBB function across taxa. Finally, we examine our current understanding of mouse and zebrafish model systems, as we expect that comparison of the BBB across organisms will provide insight into the human BBB under normal physiological conditions and in neurological diseases.
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Affiliation(s)
- Natasha M O'Brown
- Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Sarah J Pfau
- Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Chenghua Gu
- Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA
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20
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Feriani M, Biasioli S, Chiaramonte S, Fabris A, Pisani E, Ronco C, La Greca G. Anatomical Bases of Peritoneal Permeability: A Reappraisal. Anatomy of Peritoneum. Int J Artif Organs 2018. [DOI: 10.1177/039139888200500606] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The peritoneal membrane consists of flat mesothelial cells linked together with digitations and containing vesiculae with pinocytic capacity, of endothelial cells (containing Weibel-Palade's bodies and vesiculae) and of an interstitial tissue consisting of a network of watery channels. The cellular structures of mesothelium and endothelium are characterized by tight and gap junctions or perhaps by macular junctions. The visceral peritoneum shows a prevalence of gap junctions, the pericytic veins contain only tight junctions while both types can be found in the arterioles. Two different ways for solute transport are theoretically possible: the vesicles of plasmalemma (via pinocytosis) and the junctions (via size-sieving effect). Studies with tracers did not furnish unequivocal data on this problem and did not clarify if these structures could be the equivalent of the pores of the Landis-Pappenheimer's theory. The studies of Karnowsky and Simionescu, using tracers, have in fact given opposite results.
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Affiliation(s)
- M. Feriani
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - S. Biasioli
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - S. Chiaramonte
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - A. Fabris
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - E. Pisani
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - C. Ronco
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
| | - G. La Greca
- Department of Nephrology, St. Bortolo Hospital, 36100 Vicenza, Italy
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21
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Morgenthaler J, Nydegger U. Synthesis, Distribution and Catabolism of Human Plasma Proteins in Plasma Exchange. Int J Artif Organs 2018. [DOI: 10.1177/039139888400700105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- J.J. Morgenthaler
- Central Laboratory, Blood Transfusion Service SRC, Berne, Switzerland
| | - U.E. Nydegger
- Central Laboratory, Blood Transfusion Service SRC, Berne, Switzerland
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22
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Peritoneal and pleural fluids may appear hyperintense on hepatobiliary phase using hepatobiliary MR contrast agents. Eur Radiol 2018; 28:3020-3031. [PMID: 29374320 DOI: 10.1007/s00330-017-5261-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 12/06/2017] [Accepted: 12/20/2017] [Indexed: 12/18/2022]
Abstract
AIM To describe the effect of hepatobiliary-specific MR imaging contrast agent (HBCA) administration on the signal intensity of peritoneal and pleural fluid effusions on T1-weighted MR images. MATERIALS AND METHODS From October 2015 to May 2016 139 patients (mean 60±10 years old, 69 % males) with peritoneal or pleural effusions without biliary leakage who underwent HBCA-MRI (Gd-BOPTA or Gd-EOB-DTPA) at 1.5T and 3T were included from two centres. The fluid signal intensity was classified as hypo/iso/hyperintense before/after HBCA administration. The relative signal enhancement (RE) was calculated. RESULTS On hepatobiliary phase (HBP), peritoneal fluids appeared hyper/isointense in 88-100 % and pleural effusions in 100 % of the patients following Gd-BOPTA administration. All fluids remained hypointense following Gd-EOB-DTPA. The signal intensity of fluids increased with both HBCA but RE was significantly higher following Gd-BOPTA (p=0.002 to <0.001). RE was correlated with HBP acquisition time-point (r=0.42, p<0.001 and r=0.50, p=0.033 for peritoneal and pleural fluids). CONCLUSION The signal intensity of pleural and peritoneal fluids progressively increases following HBCA administration in the absence of biliary leakage. Due to its later hepatobiliary phase, this is more pronounced after Gd-BOPTA injection, leading to fluid hyperintensity that is not observed after Gd-EOB-DTPA injection. KEY POINTS • Fluids appear hyper/isointense on HBP in most patients after Gd-BOPTA injection. • Fluids remain hypointense on HBP after Gd-EOB-DTPA injection. • RE of fluids increases with time after liver-specific Gd injection. • RE of fluids is higher in patients with chronic liver disease.
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Chow BW, Gu C. Gradual Suppression of Transcytosis Governs Functional Blood-Retinal Barrier Formation. Neuron 2017; 93:1325-1333.e3. [PMID: 28334606 DOI: 10.1016/j.neuron.2017.02.043] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/14/2016] [Accepted: 02/22/2017] [Indexed: 12/26/2022]
Abstract
Blood-central nervous system (CNS) barriers partition neural tissues from the blood, providing a homeostatic environment for proper neural function. The endothelial cells that form blood-CNS barriers have specialized tight junctions and low rates of transcytosis to limit the flux of substances between blood and CNS. However, the relative contributions of these properties to CNS barrier permeability are unknown. Here, by studying functional blood-retinal barrier (BRB) formation in mice, we found that immature vessel leakage occurs entirely through transcytosis, as specialized tight junctions are functional as early as vessel entry into the CNS. A functional barrier forms only when transcytosis is gradually suppressed during development. Mutant mice with elevated or reduced levels of transcytosis have delayed or precocious sealing of the BRB, respectively. Therefore, the temporal regulation of transcytosis governs the development of a functional BRB, and suppression of transcytosis is a principal contributor for functional barrier formation.
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Affiliation(s)
- Brian Wai Chow
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA
| | - Chenghua Gu
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA.
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Nakamura I, Ichimura E, Goda R, Hayashi H, Mashiba H, Nagai D, Yokoyama H, Onda T, Masuda A. An in vivo mechanism for the reduced peripheral neurotoxicity of NK105: a paclitaxel-incorporating polymeric micellar nanoparticle formulation. Int J Nanomedicine 2017; 12:1293-1304. [PMID: 28243090 PMCID: PMC5317268 DOI: 10.2147/ijn.s114356] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In our previous rodent studies, the paclitaxel (PTX)-incorporating polymeric micellar nanoparticle formulation NK105 had showed significantly stronger antitumor effects and reduced peripheral neurotoxicity than PTX dissolved in Cremophor® EL and ethanol (PTX/CRE). Thus, to elucidate the mechanisms underlying reduced peripheral neurotoxicity due to NK105, we performed pharmacokinetic analyses of NK105 and PTX/CRE in rats. Among neural tissues, the highest PTX concentrations were found in the dorsal root ganglion (DRG). Moreover, exposure of DRG to PTX (Cmax_PTX and AUC0-inf._PTX) in the NK105 group was almost half that in the PTX/CRE group, whereas exposure of sciatic and sural nerves was greater in the NK105 group than in the PTX/CRE group. In histopathological analyses, damage to DRG and both peripheral nerves was less in the NK105 group than in the PTX/CRE group. The consistency of these pharmacokinetic and histopathological data suggests that high levels of PTX in the DRG play an important role in the induction of peripheral neurotoxicity, and reduced distribution of PTX to the DRG of NK105-treated rats limits the ensuing peripheral neurotoxicity. In further analyses of PTX distribution to the DRG, Evans blue (Eb) was injected with BODIPY®-labeled NK105 into rats, and Eb fluorescence was observed only in the DRG. Following injection, most Eb dye bound to albumin particles of ~8 nm and had penetrated the DRG. In contrast, BODIPY®–NK105 particles of ~90 nm were not found in the DRG, suggesting differential penetration based on particle size. Because PTX also circulates as PTX–albumin particles of ~8 nm following injection of PTX/CRE, reduced peripheral neurotoxicity of NK105 may reflect exclusion from the DRG due to particle size, leading to reduced PTX levels in rat DRG (275).
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Affiliation(s)
- Iwao Nakamura
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Eiji Ichimura
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Rika Goda
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Hitomi Hayashi
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Hiroko Mashiba
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Daichi Nagai
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Hirofumi Yokoyama
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Takeshi Onda
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
| | - Akira Masuda
- Nanomedicine Group, Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo, Japan
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25
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Sahin D, Yilmaz CU, Orhan N, Arican N, Kaya M, Gürses C, Ates N, Ahishali B. Changes in electroencephalographic characteristics and blood-brain barrier permeability in WAG/Rij rats with cortical dysplasia. Epilepsy Behav 2017; 67:70-76. [PMID: 28088684 DOI: 10.1016/j.yebeh.2016.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/06/2016] [Accepted: 11/03/2016] [Indexed: 12/13/2022]
Abstract
PURPOSE This study investigated the effects of cortical dysplasia (CD) on electrophysiology and blood-brain barrier (BBB) permeability in WAG/Rij rats with genetic absence epilepsy. METHODS Pregnant WAG/Rij rats were exposed to 145cGy of gamma-irradiation on embryonic day 17 to induce CD. An electroencephalogram was recorded from cortices subdurally in the offspring of the pregnant animals. Horseradish peroxidase (HRP) was used as determinant of BBB permeability. RESULTS A massive tissue loss in the cerebral cortex was seen in WAG/Rij rats with CD (p<0.05). There was a significant decrease in the number and duration of spike-and-wave discharges (SWDs) and an increase in the frequency of SWDs in the WAG/Rij rats with CD when compared with the properties of SWDs in intact WAG/Rij rats (p<0.01). Ultrastructurally, the accumulation of HRP reaction products in the cerebral cortex and thalamus of WAG/Rij rats was significantly higher than that of control values (p<0.01). The accumulation of HRP reaction products in the cerebral cortex and thalamus regions of WAG/Rij rats with CD increased and was higher than that of the control and WAG/Rij animals (p<0.01). CONCLUSION In our study, we showed that number and duration of SWDs decreased and SWD frequency increased in WAG/Rij rats with CD, suggesting a shift in seizure pattern. The association of these alterations with significant loss of cortical thickness and increased BBB permeability to HRP tracer may represent a causal relation of the EEG abnormalities with cerebral structural changes in these animals.
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Affiliation(s)
- Deniz Sahin
- Department of Physiology, Medical Faculty of Kocaeli University, Kocaeli, Turkey
| | - Canan Ugur Yilmaz
- Department of Laboratory Animals Science, Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Nurcan Orhan
- Department of Neuroscience, Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Nadir Arican
- Department of Forensic Medicine, Istanbul Faculty of Medicine, Istanbul University, Turkey
| | - Mehmet Kaya
- Koç University School of Medicine, Department of Physiology, Rumelifeneri Yolu, Sarıyer, 34450 Istanbul, Turkey.
| | - Candan Gürses
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Turkey
| | - Nurbay Ates
- Department of Physiology, Medical Faculty of Kocaeli University, Kocaeli, Turkey
| | - Bulent Ahishali
- Department of Histology and Embryology, Istanbul Faculty of Medicine, Istanbul University, Turkey
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26
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Zambrano F, Carrau T, Gärtner U, Seipp A, Taubert A, Felmer R, Sanchez R, Hermosilla C. Leukocytes coincubated with human sperm trigger classic neutrophil extracellular traps formation, reducing sperm motility. Fertil Steril 2016; 106:1053-1060.e1. [DOI: 10.1016/j.fertnstert.2016.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 06/02/2016] [Accepted: 06/02/2016] [Indexed: 12/28/2022]
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27
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Kumar NN, Gautam M, Lochhead JJ, Wolak DJ, Ithapu V, Singh V, Thorne RG. Relative vascular permeability and vascularity across different regions of the rat nasal mucosa: implications for nasal physiology and drug delivery. Sci Rep 2016; 6:31732. [PMID: 27558973 PMCID: PMC4997340 DOI: 10.1038/srep31732] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/25/2016] [Indexed: 12/25/2022] Open
Abstract
Intranasal administration provides a non-invasive drug delivery route that has been proposed to target macromolecules either to the brain via direct extracellular cranial nerve-associated pathways or to the periphery via absorption into the systemic circulation. Delivering drugs to nasal regions that have lower vascular density and/or permeability may allow more drug to access the extracellular cranial nerve-associated pathways and therefore favor delivery to the brain. However, relative vascular permeabilities of the different nasal mucosal sites have not yet been reported. Here, we determined that the relative capillary permeability to hydrophilic macromolecule tracers is significantly greater in nasal respiratory regions than in olfactory regions. Mean capillary density in the nasal mucosa was also approximately 5-fold higher in nasal respiratory regions than in olfactory regions. Applying capillary pore theory and normalization to our permeability data yielded mean pore diameter estimates ranging from 13–17 nm for the nasal respiratory vasculature compared to <10 nm for the vasculature in olfactory regions. The results suggest lymphatic drainage for CNS immune responses may be favored in olfactory regions due to relatively lower clearance to the bloodstream. Lower blood clearance may also provide a reason to target the olfactory area for drug delivery to the brain.
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Affiliation(s)
- Niyanta N Kumar
- Pharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Room #5113, Rennebohm hall, 777 Highland avenue, Madison, WI - 53705, USA
| | - Mohan Gautam
- Pharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Room #5113, Rennebohm hall, 777 Highland avenue, Madison, WI - 53705, USA
| | - Jeffrey J Lochhead
- Pharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Room #5113, Rennebohm hall, 777 Highland avenue, Madison, WI - 53705, USA
| | - Daniel J Wolak
- Pharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Room #5113, Rennebohm hall, 777 Highland avenue, Madison, WI - 53705, USA.,Clinical Neuroengineering Training Program, University of Wisconsin-Madison Biomedical Engineering, Engineering Centers Building, 1550 Engineering Drive, Room #2120, Madison WI - 53706, USA
| | - Vamsi Ithapu
- Department of Computer Sciences, University of Wisconsin-Madison, 5780 Medical Sciences Center, 1300 University Avenue, Madison, WI - 53706, USA
| | - Vikas Singh
- Department of Computer Sciences, University of Wisconsin-Madison, 5780 Medical Sciences Center, 1300 University Avenue, Madison, WI - 53706, USA
| | - Robert G Thorne
- Pharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Room #5113, Rennebohm hall, 777 Highland avenue, Madison, WI - 53705, USA.,Clinical Neuroengineering Training Program, University of Wisconsin-Madison Biomedical Engineering, Engineering Centers Building, 1550 Engineering Drive, Room #2120, Madison WI - 53706, USA.,Neuroscience Training Program &Center for Neuroscience, Rooms 9531 &9533, Wisconsin Institutes for Medical Research II, 1111 Highland Ave. Madison, WI - 53705, USA.,Cellular and Molecular Pathology Graduate Training Program, University of Wisconsin-Madison, UW Department of Pathology and Laboratory Medicine 1685 Highland Avenue Madison, WI - 53705, USA
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28
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Abstract
Dysfunction of the endothelial lining of lesion-prone areas of the arterial vasculature is an important contributor to the pathobiology of atherosclerotic cardiovascular disease. Endothelial cell dysfunction, in its broadest sense, encompasses a constellation of various nonadaptive alterations in functional phenotype, which have important implications for the regulation of hemostasis and thrombosis, local vascular tone and redox balance, and the orchestration of acute and chronic inflammatory reactions within the arterial wall. In this review, we trace the evolution of the concept of endothelial cell dysfunction, focusing on recent insights into the cellular and molecular mechanisms that underlie its pivotal roles in atherosclerotic lesion initiation and progression; explore its relationship to classic, as well as more recently defined, clinical risk factors for atherosclerotic cardiovascular disease; consider current approaches to the clinical assessment of endothelial cell dysfunction; and outline some promising new directions for its early detection and treatment.
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Affiliation(s)
- Michael A Gimbrone
- From the Department of Pathology, Center for Excellence in Vascular Biology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA.
| | - Guillermo García-Cardeña
- From the Department of Pathology, Center for Excellence in Vascular Biology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
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Gilloteaux J, Lau HL, Gourari I, Neal D, Jamison JM, Summers J. Apatone ® induces endometrioid ovarian carcinoma (MDAH 2774) cells to undergo karyolysis and cell death by autoschizis: A potent and safe anticancer treatment. TRANSLATIONAL RESEARCH IN ANATOMY 2015. [DOI: 10.1016/j.tria.2015.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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The discovery of the blood–thymus barrier. Immunol Lett 2015; 168:325-8. [DOI: 10.1016/j.imlet.2015.10.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 10/16/2015] [Accepted: 10/23/2015] [Indexed: 12/11/2022]
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Saunders NR, Dziegielewska KM, Møllgård K, Habgood MD. Markers for blood-brain barrier integrity: how appropriate is Evans blue in the twenty-first century and what are the alternatives? Front Neurosci 2015; 9:385. [PMID: 26578854 PMCID: PMC4624851 DOI: 10.3389/fnins.2015.00385] [Citation(s) in RCA: 191] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/05/2015] [Indexed: 11/18/2022] Open
Abstract
In recent years there has been a resurgence of interest in brain barriers and various roles their intrinsic mechanisms may play in neurological disorders. Such studies require suitable models and markers to demonstrate integrity and functional changes at the interfaces between blood, brain, and cerebrospinal fluid. Studies of brain barrier mechanisms and measurements of plasma volume using dyes have a long-standing history, dating back to the late nineteenth-century. Their use in blood-brain barrier studies continues in spite of their known serious limitations in in vivo applications. These were well known when first introduced, but seem to have been forgotten since. Understanding these limitations is important because Evans blue is still the most commonly used marker of brain barrier integrity and those using it seem oblivious to problems arising from its in vivo application. The introduction of HRP in the mid twentieth-century was an important advance because its reaction product can be visualized at the electron microscopical level, but it also has limitations. Advantages and disadvantages of these markers will be discussed together with a critical evaluation of alternative approaches. There is no single marker suitable for all purposes. A combination of different sized, visualizable dextrans and radiolabeled molecules currently seems to be the most appropriate approach for qualitative and quantitative assessment of barrier integrity.
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Affiliation(s)
- Norman R Saunders
- Laboratory of Developmental Neurobiology and Neurotrauma, Department of Pharmacology and Therapeutics, University of Melbourne Parkville, VIC, Australia
| | - Katarzyna M Dziegielewska
- Laboratory of Developmental Neurobiology and Neurotrauma, Department of Pharmacology and Therapeutics, University of Melbourne Parkville, VIC, Australia
| | - Kjeld Møllgård
- Department of Cellular and Molecular Medicine, University of Copenhagen Copenhagen, Denmark
| | - Mark D Habgood
- Laboratory of Developmental Neurobiology and Neurotrauma, Department of Pharmacology and Therapeutics, University of Melbourne Parkville, VIC, Australia
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Reyahi A, Nik AM, Ghiami M, Gritli-Linde A, Pontén F, Johansson BR, Carlsson P. Foxf2 Is Required for Brain Pericyte Differentiation and Development and Maintenance of the Blood-Brain Barrier. Dev Cell 2015; 34:19-32. [PMID: 26120030 DOI: 10.1016/j.devcel.2015.05.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 02/09/2015] [Accepted: 05/12/2015] [Indexed: 11/29/2022]
Abstract
Pericytes are critical for cerebrovascular maturation and development of the blood-brain barrier (BBB), but their role in maintenance of the adult BBB, and how CNS pericytes differ from those of other tissues, is less well understood. We show that the forkhead transcription factor Foxf2 is specifically expressed in pericytes of the brain and that Foxf2(-/-) embryos develop intracranial hemorrhage, perivascular edema, thinning of the vascular basal lamina, an increase of luminal endothelial caveolae, and a leaky BBB. Foxf2(-/-) brain pericytes were more numerous, proliferated faster, and expressed significantly less Pdgfrβ. Tgfβ-Smad2/3 signaling was attenuated, whereas phosphorylation of Smad1/5 and p38 were enhanced. Tgfβ pathway components, including Tgfβ2, Tgfβr2, Alk5, and integrins αVβ8, were reduced. Foxf2 inactivation in adults resulted in BBB breakdown, endothelial thickening, and increased trans-endothelial vesicular transport. On the basis of these results, FOXF2 emerges as an interesting candidate locus for stroke susceptibility in humans.
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Affiliation(s)
- Azadeh Reyahi
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 405 30 Gothenburg, Sweden
| | - Ali M Nik
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 405 30 Gothenburg, Sweden
| | - Mozhgan Ghiami
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 405 30 Gothenburg, Sweden
| | - Amel Gritli-Linde
- Department of Oral Biochemistry, Sahlgrenska Academy, University of Gothenburg, Box 450, 405 30 Gothenburg, Sweden
| | - Fredrik Pontén
- Department of Immunology, Genetics and Pathology, Rudbecklaboratoriet, Uppsala University, 751 85 Uppsala, Sweden
| | - Bengt R Johansson
- Institute of Biomedicine, University of Gothenburg, Box 440, 405 30 Gothenburg, Sweden
| | - Peter Carlsson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, 405 30 Gothenburg, Sweden.
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Gilloteaux J, Pardhan D. Crinophagy in Thyroid Follicular and Parafollicular Cells of Male Obese Zucker Rat. Ultrastruct Pathol 2015; 39:255-69. [PMID: 25867801 DOI: 10.3109/01913123.2015.1014611] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Comparison between lean (Fa/?) and obese (fa/fa) young adult male Zucker rat thyroids reveals that obese rats display larger clusters of parafollicular cells than the lean ones with a lesser blood supply. Fa/? thyroid typically shows single or "twin" C cells in follicles; fa/fa parafollicular cells appear with three functional aspects. Crinophagy is found in the fa/fa C cells amassing numerous aberrant calcitonin-containing vesicles among which lysosomes build these autophagic bodies by capturing vesicle contents, other organelles and, fusing with each other, increase their size. Other C cells contain many secretory vesicles but show few or no crinophagic structures. Another parafollicular cell type is revealed with scant organelles and highly contrasted secretory vesicles, different from calcitonin. Hypercalcemia of fa/fa rats corresponds to increased C cells population with accrued calcitonin production but a low calcitonin plasma level - verified by others - is likely caused by crinophagy of the altered vesicles. In addition, the T thyrocytes of fa/fa rats exhibit crinophagy bodies; this can confirm their hypothyroidism. Possibly, the known leptin mutation along with other unknown paracrine secretions alter both T and C thyrocytes' functions of the fa/fa rats, allowing high intracellular calcium and lower pH favoring autophagocytosis. Other longitudinal, interdisciplinary studies should further clarify the complex paracrine interactions existing between these endocrine structures because this animal model could be useful to understand human defects, such as the metabolic syndrome that involves obesity, cardiovascular, renal, hepatic, non-insulin dependent diabetes mellitus (NIDDM), hypothyroidism defects, as well as the etiology of thyroid medullary tumors.
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Affiliation(s)
- Jacques Gilloteaux
- Department of Anatomical Sciences, St George's University School of Medicine, KB Taylor Global Scholar's Programme at Northumbria University , Newcastle upon Tyne , UK
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35
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Agile delivery of protein therapeutics to CNS. J Control Release 2014; 190:637-63. [PMID: 24956489 DOI: 10.1016/j.jconrel.2014.06.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/10/2014] [Accepted: 06/13/2014] [Indexed: 12/11/2022]
Abstract
A variety of therapeutic proteins have shown potential to treat central nervous system (CNS) disorders. Challenge to deliver these protein molecules to the brain is well known. Proteins administered through parenteral routes are often excluded from the brain because of their poor bioavailability and the existence of the blood-brain barrier (BBB). Barriers also exist to proteins administered through non-parenteral routes that bypass the BBB. Several strategies have shown promise in delivering proteins to the brain. This review, first, describes the physiology and pathology of the BBB that underscore the rationale and needs of each strategy to be applied. Second, major classes of protein therapeutics along with some key factors that affect their delivery outcomes are presented. Third, different routes of protein administration (parenteral, central intracerebroventricular and intraparenchymal, intranasal and intrathecal) are discussed along with key barriers to CNS delivery associated with each route. Finally, current delivery strategies involving chemical modification of proteins and use of particle-based carriers are overviewed using examples from literature and our own work. Whereas most of these studies are in the early stage, some provide proof of mechanism of increased protein delivery to the brain in relevant models of CNS diseases, while in few cases proof of concept had been attained in clinical studies. This review will be useful to broad audience of students, academicians and industry professionals who consider critical issues of protein delivery to the brain and aim developing and studying effective brain delivery systems for protein therapeutics.
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36
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The effects of superoxide dismutase mimetic MnTMPyP on the altered blood–brain barrier integrity in experimental preeclampsia with or without seizures in rats. Brain Res 2014; 1563:91-102. [DOI: 10.1016/j.brainres.2014.03.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/26/2014] [Accepted: 03/18/2014] [Indexed: 12/22/2022]
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McDonald KL. Out with the old and in with the new: rapid specimen preparation procedures for electron microscopy of sectioned biological material. PROTOPLASMA 2014; 251:429-448. [PMID: 24258967 DOI: 10.1007/s00709-013-0575-y] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 10/22/2013] [Indexed: 06/02/2023]
Abstract
This article presents the best current practices for preparation of biological samples for examination as thin sections in an electron microscope. The historical development of fixation, dehydration, and embedding procedures for biological materials are reviewed for both conventional and low temperature methods. Conventional procedures for processing cells and tissues are usually done over days and often produce distortions, extractions, and other artifacts that are not acceptable for today's structural biology standards. High-pressure freezing and freeze substitution can minimize some of these artifacts. New methods that reduce the times for freeze substitution and resin embedding to a few hours are discussed as well as a new rapid room temperature method for preparing cells for on-section immunolabeling without the use of aldehyde fixatives.
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Affiliation(s)
- Kent L McDonald
- Electron Microscope Laboratory, University of California, 26 Giannini Hall, Berkeley, CA, 94720, USA,
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38
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Brubacher JL, Vieira AP, Newmark PA. Preparation of the planarian Schmidtea mediterranea for high-resolution histology and transmission electron microscopy. Nat Protoc 2014; 9:661-73. [PMID: 24556788 DOI: 10.1038/nprot.2014.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The flatworm Schmidtea mediterranea is an emerging model species in fields such as stem cell biology, regeneration and evolutionary biology. Excellent molecular tools have been developed for S. mediterranea, but ultrastructural techniques have received far less attention. Processing specimens for histology and transmission electron microscopy (TEM) is notoriously idiosyncratic for particular species or specimen types. Unfortunately, however, most methods for S. mediterranea described in the literature lack numerous essential details, and those few that do provide them rely on specialized equipment that may not be readily available. Here we present an optimized protocol for ultrastructural preparation of S. mediterranea. The protocol can be completed in 6 d, much of which is 'hands-off' time. To aid with troubleshooting, we also illustrate the major effects of seemingly minor variations in fixative, buffer concentration and dehydration steps. This procedure will be useful for all planarian researchers, particularly those with relatively little experience in tissue processing.
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Affiliation(s)
- John L Brubacher
- Faculty of Humanities and Sciences, Canadian Mennonite University, Winnipeg, Manitoba, Canada
| | - Ana P Vieira
- Howard Hughes Medical Institute and Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Phillip A Newmark
- Howard Hughes Medical Institute and Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
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Kasinathan N, Jagani HV, Alex AT, Volety SM, Rao JV. Strategies for drug delivery to the central nervous system by systemic route. Drug Deliv 2014; 22:243-57. [DOI: 10.3109/10717544.2013.878858] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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40
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Robert AM, Godeau G, Miskulin M, Moati F. Mechanism of action of collagenase on the permeability of the blood-brain barrier. Neurochem Res 2013; 2:449-55. [PMID: 24272152 DOI: 10.1007/bf00965468] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/1977] [Indexed: 11/28/2022]
Abstract
Some proteolytic enzymes are able to increase reversibly the permeability of the blood-brain barrier (BBB) to different tracers such as trypan blue. Intraventricularly injected collagenase is the most potent of the enzymes tested. It was assumed that collagenase acts on basement membrane collagen, the partial hydrolysis of which increases BBB permeability, and that the recovery of normal permeability requires resynthesis of the degraded substrate. In this paper, it is shown that injection of collagenase in lateral brain ventricles of rats increases the level of hydroxyproline (hypro) in the CSF, suggesting that collagen is indeed degraded by the enzyme. We also demonstrate that treatment with inhibitors of protein synthesis-puromycin and cycloheximide-delays considerably the recovery of normal BBB permeability, which occurs 140 h after collagenase treatment instead of 70-72 h without inhibitors. This fact indicates that protein synthesis is necessary for the recovery of normal BBB permeability. The demonstration of release of hypro in the cerebrospinal fluid (CSF) after collagenase action, and of the necessity of protein synthesis for the recovery of normal permeability, supports the above-mentioned hypothesis, according to which basement membrane collagen plays a role in the regulation of the permeability of the BBB.
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Affiliation(s)
- A M Robert
- Laboratoire de Biochimie du Tissu Conjonctif (ER CNRS 53), Faculté de Médecine, 6, rue du Général Sarrail 94000, Creteil, France
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41
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Durán WN, Beuve AV, Sánchez FA. Nitric oxide, S-nitrosation, and endothelial permeability. IUBMB Life 2013; 65:819-26. [PMID: 24078390 DOI: 10.1002/iub.1204] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 07/22/2013] [Indexed: 11/06/2022]
Abstract
S-Nitrosation is rapidly emerging as a regulatory mechanism in vascular biology, with particular importance in the onset of hyperpermeability induced by pro-inflammatory agents. This review focuses on the role of endothelial nitric oxide synthase (eNOS)-derived nitric oxide (NO) in regulating S-Nitrosation of adherens junction proteins. We discuss evidence for translocation of eNOS, via caveolae, to the cytosol and analyze the significance of eNOS location for S-Nitrosation and onset of endothelial hyperpermeability to macromolecules.
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Affiliation(s)
- Walter N Durán
- Department of Pharmacology and Physiology, New Jersey Medical School; Rutgers, The State University of New Jersey, Newark, NJ, 07101-1709, U.S.A
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42
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Nagy JA, Dvorak AM, Dvorak HF. Vascular hyperpermeability, angiogenesis, and stroma generation. Cold Spring Harb Perspect Med 2013; 2:a006544. [PMID: 22355795 DOI: 10.1101/cshperspect.a006544] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
It has been known for more than half a century that the tumor microvasculature is hyperpermeable to plasma proteins. However, the identity of the leaky vessels and the consequences of vascular hyperpermeability have received little attention. This article places tumor vascular hyperpermeability in a broader context, relating it to (1) the low-level "basal" permeability of the normal vasculature; (2) the "acute," short-term hyperpermeability induced by vascular permeability factor/vascular endothelial growth factor (VPF/VEGF-A) and other vascular permeabilizing agents; and (3) the "chronic" hyperpermeability associated with longer-term exposure to agents such as VPF/VEGF-A that accompanies many types of pathological angiogenesis. Leakage of plasma protein-rich fluids is important because it activates the clotting system, depositing an extravascular fibrin gel provisional matrix that serves as the first step in stroma generation.
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Affiliation(s)
- Janice A Nagy
- Center for Vascular Biology Research and the Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02115, USA
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43
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Araki T, Okada H, Araki T. Enhancement of ascites during abdominal oncological endovascular intervention without iatrogenic extravasation in patients with chronic liver disease. Clin Radiol 2013; 68:e460-6. [PMID: 23623579 DOI: 10.1016/j.crad.2013.03.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Revised: 03/06/2013] [Accepted: 03/14/2013] [Indexed: 11/17/2022]
Abstract
AIM To evaluate ascites enhancement during abdominal oncological endovascular intervention (IVR) without iatrogenic extravasation and the factors associated with enhancement of ascites. METHODS AND MATERIALS CT images were obtained using an IVR-CT system for 73 patients with chronic liver disease and ascites. The CT images were obtained at least twice during each IVR. Radiodensity values of ascites at CT were measured for the first and last CT images in each procedure. The factors evaluated for their association with elevated ascitic fluid density were age, interval from the first to the last CT scan, Child-Pugh score, albumin level, total bilirubin level, prothrombin activity, the need for transcatheter arterial chemoembolization (TACE), estimated glomerular filtration rate, total amount of contrast material (CM) per square metre of body surface area (/m(2)), amount of ascitic fluid, and the amount of CM entering the superior mesenteric artery (SMA) or coeliac artery/m(2). RESULTS The average ascitic radiodensity values for the first and last CT images were 18 and 51 HU, respectively. The percentage of patients with "significantly elevated" ascitic fluid density (≥10 HU) was 92%. Multivariate analysis showed that the total amount of CM/m(2) and the amount of ascitic fluid were significantly correlated and inversely correlated, respectively, with elevated ascitic fluid density. CONCLUSIONS Ascites enhancement without extravasation frequently occurs during abdominal oncological endovascular intervention in patients with chronic liver disease.
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Affiliation(s)
- Takuji Araki
- Department of Radiology, University of Yamanashi, University Hospital, Yamanashi, Japan.
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Abstract
Claudins are tight junction membrane proteins that are expressed in epithelia and endothelia and form paracellular barriers and pores that determine tight junction permeability. This review summarizes our current knowledge of this large protein family and discusses recent advances in our understanding of their structure and physiological functions.
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Affiliation(s)
- Dorothee Günzel
- Department of Clinical Physiology, Charité, Campus Benjamin Franklin, Berlin, Germany
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45
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Topiramate reduces blood–brain barrier disruption and inhibits seizure activity in hyperthermia-induced seizures in rats with cortical dysplasia. Brain Res 2013. [DOI: 10.1016/j.brainres.2012.11.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Li X, Wen F, Creran B, Jeong Y, Zhang X, Rotello VM. Colorimetric protein sensing using catalytically amplified sensor arrays. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:3589-92. [PMID: 22961696 PMCID: PMC3514658 DOI: 10.1002/smll.201201549] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Indexed: 05/06/2023]
Abstract
Catalytically active iron oxide nanoparticles are used as recognition elements and signal amplifiers for the array-based colorimetric sensing of proteins. Interactions between cationic monolayers on the Fe(3) O(4) NPs and analyte proteins differentially modulates the peroxidase-like activity of Fe(3) O(4) NPs, affording catalytically amplified colorimetric signal patterns that enable the detection and identification of proteins at 50 nM.
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Affiliation(s)
- Xiaoning Li
- Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, Massachusetts, 01003
| | - Fang Wen
- Beijing Key Laboratory of Analytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China
| | - Brian Creran
- Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, Massachusetts, 01003
| | - Youngdo Jeong
- Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, Massachusetts, 01003
| | - Xinrong Zhang
- Beijing Key Laboratory of Analytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China
| | - Vincent M. Rotello
- Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, Massachusetts, 01003
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47
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Release of dopamine beta-hydroxylase and chromogranin A upon stimulation of the splenic nerve. Tissue Cell 2012; 2:547-68. [PMID: 18631532 DOI: 10.1016/s0040-8166(70)80030-1] [Citation(s) in RCA: 154] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/1970] [Indexed: 11/22/2022]
Abstract
Two proteins present in noradrenergic vesicles of the splenic nerve (dopamine beta-hydroxylase and chromogranin A) are released into the perfusate from the spleen when the splenic nerve is stimulated. Experiments in which drugs were added to the perfusion fluid showed that the proteins were released from terminals of the splenic nerve. There was a correlation between the amounts of the proteins released and the quantity of noradrenaline released; and the release process was dependent upon calcium. It is suggested that the proteins are released from the large dense-cored vesicles present in the terminals of the splenic nerve, and that secretion from these vesicles occurs by exocytosis.
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48
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Price DL, Griffin JW. Tetanus toxin: Retrograde axonal transport of systemically administered toxin. Neurosci Lett 2012; 4:61-5. [PMID: 19604922 DOI: 10.1016/0304-3940(77)90145-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/1976] [Accepted: 12/10/1976] [Indexed: 10/27/2022]
Abstract
After intramuscular injection, [(125)I] tetanus toxin is carried to spinal motor neurons by retrograde axonal transport. In the present study, we asked whether systemically administered toxin can be transported toward the spinal cord via this intraaxonal pathway. Mice were given [(125)I] tetanus toxin intraperitoneally, one sciatic nerve was ligated and, 24 h later, the animals were perfused. Autoradiograms showed labeled toxin accumulated within axons distal to the ligature. We interpret these findings as indicating that circulating toxin can leak out of intramuscular capillaries, be taken up at nerve terminals, and subsequently be carried toward the spinal cord by retrograde axonal transport. This pathway may be an important route by which systemically administered toxin can reach the CNS.
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Affiliation(s)
- D L Price
- Departments of Neurology and Pathology (Division of Neuropathology), The Johns Hopkins University School of Medicine, Baltimore, Md. 21205 U.S.A
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49
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Jennemann R, Kaden S, Sandhoff R, Nordström V, Wang S, Volz M, Robine S, Amen N, Rothermel U, Wiegandt H, Gröne HJ. Glycosphingolipids are essential for intestinal endocytic function. J Biol Chem 2012; 287:32598-616. [PMID: 22851168 DOI: 10.1074/jbc.m112.371005] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Glycosphingolipids (GSLs) constitute major components of enterocytes and were hypothesized to be potentially important for intestinal epithelial polarization. The enzyme UDP-glucose ceramide glucosyltransferase (Ugcg) catalyzes the initial step of GSL biosynthesis. Newborn and adult mice with enterocyte-specific genetic deletion of the gene Ugcg were generated. In newborn mutants lacking GSLs at day P0, intestinal epithelia were indistinguishable from those in control littermates displaying an intact polarization with regular brush border. However, those mice were not consistently able to absorb nutritional lipids from milk. Between postnatal days 5 and 7, severe defects in intestinal epithelial differentiation occurred accompanied by impaired intestinal uptake of nutrients. Villi of mutant mice became stunted, and enterocytes lacked brush border. The defects observed in mutant mice caused diarrhea, malabsorption, and early death. In this study, we show that GSLs are essential for enterocyte resorptive function but are primarily not for polarization; GSLs are required for intracellular vesicular transport in resorption-active intestine.
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Affiliation(s)
- Richard Jennemann
- Department of Cellular and Molecular Pathology, German Cancer Research Center, 69120 Heidelberg, Germany.
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50
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Felipe-Pérez YE, Valencia J, Juárez-Mosqueda MDL, Pescador N, Roa-Espitia AL, Hernández-González EO. Cytoskeletal proteins F-actin and β-dystrobrevin are altered by the cryopreservation process in bull sperm. Cryobiology 2011; 64:103-9. [PMID: 22209823 DOI: 10.1016/j.cryobiol.2011.12.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Revised: 12/16/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
Abstract
The cryopreservation process has an important impact on sperm structure and physiology. The negative effects have been mainly observed on the plasma membrane, which is directly stabilized by the cytoskeleton. Since cytoskeleton proteins are osmosensitive and thermosensitive, the aim of this study was to evaluate the damage caused to the bull sperm cytoskeleton by cryopreservation (freezing-thawing). Fresh and frozen-thawed bull semen samples were exposed to a treatment with the neutral detergent Brij 36-T. Electron microscopy evidenced important damages at the sperm perinuclear theca after the protein extraction protocol; the perinuclear theca was partially solubilized, the perinuclear theca substructure disappeared in the cryopreserved samples. Furthermore, the sperm head's shape was significantly altered on the cryopreserved samples. Fluorescence analysis showed a decrease of the intensity of actin and dystrobrevin on the frozen-thawed samples. Western blot assays revealed a stronger signal for actin and β-dystrobrevin in the frozen-thawed sperm samples than in the fresh ones. Our results suggest that the cryopreservation process highly alters the sperm cytoskeleton stability, causing its proteins to become more fragile and therefore more susceptible to be extracted.
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