scholarly journals Passing the Vascular Barrier: Endothelial Signaling Processes Controlling Extravasation

2019 ◽  
Vol 99 (3) ◽  
pp. 1467-1525 ◽  
Author(s):  
Nina Wettschureck ◽  
Boris Strilic ◽  
Stefan Offermanns
Keyword(s):  
Vascular Endothelium ◽  
Intercellular Junctions ◽  
The Body ◽  
Surrounding Tissue ◽  
Central Function ◽  
Pathological Conditions ◽  
Signaling Mechanisms ◽  
Paracellular Pathways ◽  
Barrier Regulation ◽  
Opening And Closing

A central function of the vascular endothelium is to serve as a barrier between the blood and the surrounding tissue of the body. At the same time, solutes and cells have to pass the endothelium to leave or to enter the bloodstream to maintain homeostasis. Under pathological conditions, for example, inflammation, permeability for fluid and cells is largely increased in the affected area, thereby facilitating host defense. To appropriately function as a regulated permeability filter, the endothelium uses various mechanisms to allow solutes and cells to pass the endothelial layer. These include transcellular and paracellular pathways of which the latter requires remodeling of intercellular junctions for its regulation. This review provides an overview on endothelial barrier regulation and focuses on the endothelial signaling mechanisms controlling the opening and closing of paracellular pathways for solutes and cells such as leukocytes and metastasizing tumor cells.

scholarly journals THE ROLE OF VASCULAR ENDOTHELIUM IN THE ORGANISM AND THE UNIVERSAL MECHANISMS OF CHANGING ITS ACTIVITY (REVIEW)

2018 ◽  
Vol 1 (68) ◽  
pp. 107-116 ◽  
Author(s):  
Николай Дорофиенко ◽  
Nikolay Dorofienko
Keyword(s):  
Endothelial Dysfunction ◽  
Vascular Endothelium ◽  
The Body ◽  
Biological Role ◽  
Vascular Endothelial ◽  
Vascular Endothelial Dysfunction ◽  
Pathological Conditions

The review summarizes and presents the results of studies of the biological role of the vascular endothelium in the body, the universal mechanisms of regulation of its activity and the disturbances of functions in various pathologies. The role of vasoconstrictive and vasodilating factors in the development of endothelial dysfunction is shown. The importance of hypoxia in the development of vascular endothelial dysfunction and the role of hormones in the regulation of vascular endothelium functions is considered. A particular attention is paid to universal mechanisms of endothelium involvement in the onset and development of pathological conditions during pregnancy. The role of endothelial dysfunction in the pathogenesis of gestosis development is discussed. There were summarized the data about the study of endothelial mechanisms of regulation of contractile reactions of the vessels of placenta.

Healthy Gut, Healthy Brain: The Gut Microbiome in Neurodegenerative Disorders

2020 ◽  
Vol 20 (13) ◽  
pp. 1142-1153 ◽  
Author(s):  
Sreyashi Chandra ◽  
Md. Tanjim Alam ◽  
Jhilik Dey ◽  
Baby C. Pulikkaparambil Sasidharan ◽  
Upasana Ray ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Neurodegenerative Disorders ◽  
The Body ◽  
Therapeutic Approaches ◽  
Cns Disorders ◽  
Physiological Conditions ◽  
Pathological Conditions ◽  
The Central Nervous System ◽  
Present Understanding ◽  
Lateral Sclerosis

Background: The central nervous system (CNS) known to regulate the physiological conditions of human body, also itself gets dynamically regulated by both the physiological as well as pathological conditions of the body. These conditions get changed quite often, and often involve changes introduced into the gut microbiota which, as studies are revealing, directly modulate the CNS via a crosstalk. This cross-talk between the gut microbiota and CNS, i.e., the gut-brain axis (GBA), plays a major role in the pathogenesis of many neurodegenerative disorders such as Parkinson’s disease (PD), Alzheimer’s disease (AD), amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS) and Huntington’s disease (HD). Objective: We aim to discuss how gut microbiota, through GBA, regulate neurodegenerative disorders such as PD, AD, ALS, MS and HD. Methods: In this review, we have discussed the present understanding of the role played by the gut microbiota in neurodegenerative disorders and emphasized the probable therapeutic approaches being explored to treat them. Results: In the first part, we introduce the GBA and its relevance, followed by the changes occurring in the GBA during neurodegenerative disorders and then further discuss its role in the pathogenesis of these diseases. Finally, we discuss its applications in possible therapeutics of these diseases and the current research improvements being made to better investigate this interaction. Conclusion: We concluded that alterations in the intestinal microbiota modulate various activities that could potentially lead to CNS disorders through interactions via the GBA.

scholarly journals Injectable non-leaching tissue-mimetic bottlebrush elastomers as an advanced platform for reconstructive surgery

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Erfan Dashtimoghadam ◽  
Farahnaz Fahimipour ◽  
Andrew N. Keith ◽  
Foad Vashahi ◽  
Pavel Popryadukhin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Reconstructive Surgery ◽  
Biomedical Applications ◽  
The Body ◽  
Surrounding Tissue ◽  
Curing Time ◽  
Materials Used ◽  
Significant Health

AbstractCurrent materials used in biomedical devices do not match tissue’s mechanical properties and leach various chemicals into the body. These deficiencies pose significant health risks that are further exacerbated by invasive implantation procedures. Herein, we leverage the brush-like polymer architecture to design and administer minimally invasive injectable elastomers that cure in vivo into leachable-free implants with mechanical properties matching the surrounding tissue. This strategy allows tuning curing time from minutes to hours, which empowers a broad range of biomedical applications from rapid wound sealing to time-intensive reconstructive surgery. These injectable elastomers support in vitro cell proliferation, while also demonstrating in vivo implant integrity with a mild inflammatory response and minimal fibrotic encapsulation.

Extase scopique, sédimentation langagičre et inscription corporelle. Les images dans la civilisation contemporaine

PARADIGMI ◽  
2009 ◽  
pp. 71-83
Author(s):  
Jean-Jacques Wunenburger
Keyword(s):  
Key Words ◽  
The Body ◽  
Pathological Conditions ◽  
Image Informatics

- Linguistic Sedimentation, and Bodily Inscription At present, we are exposed to an excessive offer of images, which raises a problem of assimilation. Subjects are increasingly passive, in ways that can border on pathological conditions. Yet, it is not so much a question of condemning this situation as of finding a way of re-symbolizing images, saving them from mere contemplation and inserting them in a process of contextualisation. Such a process requires an understanding of the role of the body and of the incorporation of images along the lines of Bachelard's intuition of the "resisting" nature of images. This raises the possibility of an education to images suited to the present age.Key words: Alienation, Education, Embodiment, Image, Informatics, Symbolisation.Parole chiave: Alienazione, Educazione, Immagine, Incorporazione, Informatica, Simbolizzazione.

Some aspects of hemostasis in the tactics of the ophthalmologist. Literature review

2021 ◽  
pp. 265-270
Author(s):  
O.M. Stanishevskaya ◽  
◽  
M.A. Safronova ◽  
G.V. Bratko ◽  
I.Y. Efremova ◽  
...  
Keyword(s):  
Open Angle Glaucoma ◽  
Vascular Diseases ◽  
Laboratory Diagnosis ◽  
The Body ◽  
Vascular Pathology ◽  
Treatment Result ◽  
Important Place ◽  
Correct Orientation ◽  
Pathological Conditions ◽  
Wide Range

Disorders of hemostasis occupy an important place in the structure of vascular diseases and are one of the most frequent pathological conditions encountered in practical medicine. The hemostasis system is naturally the most vulnerable system of the body. Violations of its balance are found in a wide variety of physiological and pathological conditions of the body. It is not uncommon for the first debut of decompensation to lead to an ophthalmologist. In the practice of an ophthalmologist, there are diseases when it is necessary to pay close attention to thrombophilic conditions. Changes in the hemostatic system, affect a wide range of vascular diseases of the eyeball. Recognition of the type of thrombophilia and its timely laboratory diagnosis in patients with vascular diseases of the retina and optic nerve are important in achieving the best treatment results. Multidisciplinary approach to the treatment of vascular diseases of the eyeball and modern diagnostics, including the study of hemostasis, is necessary and relevant to achieve the best clinical and functional treatment result. Timely and correct orientation of patients in vascular pathology is extremely important due to the fact that concomitant systemic pathology can aggravate the course of the disease, therefore, the choice of treatment tactics for this category of patients should be carried out in conjunction with a therapist, cardiologist, hematologist and endocrinologist. Key words: hemostasis, thrombosis CVS, diabet, primary open-angle glaucoma thrombodynamica, cardiovascular pathology.

scholarly journals Injectable Non-leaching Tissue-mimetic Bottlebrush Elastomers: A New Platform for Advancing Reconstructive Surgery

2020 ◽  
Author(s):  
Erfan Dashtimoghadam ◽  
Farahnaz Fahimipour ◽  
Andrew Keith ◽  
Foad Vashahi ◽  
Pavel Popryadukhin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Reconstructive Surgery ◽  
Biomedical Applications ◽  
The Body ◽  
Surrounding Tissue ◽  
Curing Time ◽  
Materials Used ◽  
Significant Health

Abstract Current materials used in biomedical devices do not match tissue’s mechanical properties and leach various chemicals into the body. These deficiencies pose significant health risks that are further exacerbated by invasive implantation procedures. Herein, we leverage the brush-like polymer architecture to design and administer minimally invasive injectable elastomers that cure in vivo into leachable-free implants with mechanical properties matching the surrounding tissue. This strategy allows tuning curing time from minutes to hours, which empowers a broad range of biomedical applications from rapid wound sealing to time-intensive reconstructive surgery. These injectable elastomers support in vitro cell proliferation, while also demonstrating in vivo implant integrity with a mild inflammatory response and minimal fibrotic encapsulation.

scholarly journals Удосконалення методів діагностики піометри у кішок за допомогою сонографії

2015 ◽  
pp. 182-185
Author(s):  
Д. О. Вусик
Keyword(s):  
The Body ◽  
Surrounding Tissue ◽  
Maximum Diameter ◽  
Experimental Animals ◽  
Healthy Female

Протягом 2008–2014 років в умовах ветеринарно-го центра «Хелс» м. Суми сонографічним методомбуло досліджено 221 кішку. Сонографічним мето-дом насамперед визначили ультразвукову харак-теристику морфологічного стану матки клінічноздорових кішок у період анеструсу. Ехограма здо-рової матки характеризується рівними та однорід-ними стінками, відсутністю візуалізації порожнини,середньої або незначно зниженою по відношенню дооточуючих тканин ехогенністю. Яєчники у здоровихкішок під час сонографічного дослідження не ві-зуалізувались. Ехограма матки в разі піометри ха-рактеризується розширенням рогів матки, потов-щенням або розширенням порожнини матки. Макси-мальний діаметр тіла та рогів матки становив від-повідно 2,4 см і 5,8 см. Розширення порожнини мат-ки відмічалося у всіх дослідних тварин у випадку піо-метри. Водночас у тварин ширина порожнини маткистановила 1,22 ± 0,35 см. Вмітиме порожнини маткимало гіпоехогенне або анехогенне відображення, вдеяких випадках відзначалася помірна гіпоехогенназернистість. During 2008–2014 years 221 cats were investigated with the help of sonographic method in Sumy veterinary center «Health». Primarily the ultrasound characteristic of morphological condition of the uterus of clinical healthy female of cats during anoestrus was determined by the sonographic method. Echogram of healthy uterus is characterized by equal and uniform walls, lack of visualization of cavities, medium or slightly reduced relative to the surrounding tissue echogenicity. The ovaries of healthy cats at sonographic research were not visualized. Sonogram of the uterus with pyometra is characterized by enlargement of uterine horns, thickening or enlargement of the uterus. The maximum diameter of the body and uterine horns made pursuant 2,4–5,8 cm. Expanding uterus was noted in all experimental animals with pyometra. This animal uterus width was 1,22±0,35 cm. Contents of uterus were hypoechoic or anechoic display, in some cases hypoechoic moderate graininess was marked.

scholarly journals Behavioral and Neurobiological Consequences of Hedonic Feeding on Alcohol Drinking

2020 ◽  
Vol 26 (20) ◽  
pp. 2309-2315 ◽  
Author(s):  
Julianna Brutman ◽  
Jon F. Davis ◽  
Sunil Sirohi
Keyword(s):  
Alcohol Drinking ◽  
Alcohol Intake ◽  
Energy Homeostasis ◽  
Drugs Of Abuse ◽  
Drinking Behavior ◽  
The Body ◽  
Alcohol And Drugs ◽  
Signaling Mechanisms ◽  
Functional Consequences ◽  
Neuropsychiatric Conditions

A complex interplay of peripheral and central signaling mechanisms within the body of an organism maintains energy homeostasis. In addition, energy/food intake is modified by various external factors (e.g., palatability, food availability, social and environmental triggers). Highly palatable foods can provoke maladaptive feeding behavior, which in turn disrupts normal homeostatic regulation resulting in numerous health consequences. Furthermore, neuroendocrine peptides, traditionally considered to regulate appetite and energy homeostasis, also control the intake and reinforcing properties of alcohol and drugs of abuse. Therefore, dysregulated eating as a result of a hedonic/binge-like intake of hyper-palatable food may impact alcohol drinking behavior. Relevant in this case is the fact that eating disorders are highly comorbid with several neuropsychiatric conditions, including alcohol use disorder. The present review is intended to summarize the neurobiological and functional consequences of hedonic feeding on alcohol intake.

scholarly journals Treponema pallidum Disrupts VE-Cadherin Intercellular Junctions and Traverses Endothelial Barriers Using a Cholesterol-Dependent Mechanism

2021 ◽  
Vol 12 ◽  
Author(s):  
Karen V. Lithgow ◽  
Emily Tsao ◽  
Ethan Schovanek ◽  
Alloysius Gomez ◽  
Leigh Anne Swayne ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Lipid Raft ◽  
Vascular Endothelium ◽  
Immunofluorescence Microscopy ◽  
Treponema Pallidum ◽  
Intercellular Junctions ◽  
Endothelial Barriers ◽  
Junctional Protein ◽  
Gain Access ◽  
Dependent Mechanism

Treponema pallidum subspecies pallidum, the causative agent of syphilis, traverses the vascular endothelium to gain access to underlying tissue sites. Herein, we investigate the mechanisms associated with T. pallidum traversal of endothelial barriers. Immunofluorescence microscopy reveals that a subpopulation of T. pallidum localizes to intercellular junctions and that viable T. pallidum, as well as a T. pallidum vascular adhesin (Tp0751), disrupts the architecture of the main endothelial junctional protein VE-cadherin. Intriguingly, in this study we show that T. pallidum traverses endothelial barriers with no disruption in barrier permeability. Furthermore, barrier traversal by T. pallidum is reduced by pretreatment of endothelial cells with filipin, an inhibitor that blocks cholesterol-mediated endocytosis. Collectively, these results suggest that T. pallidum can use a cholesterol-dependent, lipid raft-mediated endocytosis mechanism to traverse endothelial barriers. Further, treponemal localization to, and disruption of, intercellular junctions suggests that a paracellular route may also be utilized, a dual traversal strategy that has also been observed to occur for leukocytes and other invasive bacteria.

scholarly journals Analysis of nitric oxide donor effectiveness in resistance vessels

2005 ◽  
Vol 288 (5) ◽  
pp. H2390-H2399 ◽  
Author(s):  
Daniel R. Hyduke ◽  
James C. Liao
Keyword(s):  
Nitric Oxide ◽  
Blood Cell ◽  
Red Blood Cell ◽  
Interstitial Space ◽  
The Body ◽  
Nitric Oxide Donor ◽  
Free Zone ◽  
Pathological Conditions ◽  
Resistance Vessels ◽  
No Bioavailability

Decreased nitric oxide (NO) bioavailability is associated with a number of pathological conditions. Administration of a supplemental source of NO can counter the pathological effects arising from decreased NO bioavailability. A class of NO-nucleophile adducts that spontaneously release NO (NONOates) has been developed, and its members show promise as therapeutic sources of NO. Because the NONOates release NO spontaneously, a significant portion of the NO may be consumed by the myriad of NO reactive species present in the body. Here we develop a model to analyze the efficacy of NO delivery, by membrane-impermeable NONOates, in the resistance arterioles. Our model identifies three features of blood vessels that will enhance NONOate efficacy: 1) the amount of NO delivered to the abluminal region increases with lumen radius; 2) the presence of a flow-induced red blood cell-free zone will augment NO delivery; and 3) extravasation of the NONOate into the interstitial space will increase abluminal NO delivery. These results suggest that NONOates may be more effective in larger vessels and that NONOate efficacy can be altered by modifying permeability to the interstitial space.

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