scholarly journals Current Status of Putative Animal Sources of SARS-CoV-2 Infection in Humans: Wildlife, Domestic Animals and Pets

2021 ◽  
Vol 9 (4) ◽  
pp. 868
Author(s):  
Max Maurin ◽  
Florence Fenollar ◽  
Oleg Mediannikov ◽  
Bernard Davoust ◽  
Christian Devaux ◽  
...  
Keyword(s):  
Animal Species ◽  
Biological Properties ◽  
Experimental Models ◽  
Current Data ◽  
The Body ◽  
Receptor Expression ◽  
Current Status ◽  
Susceptible Animal

SARS-CoV-2 is currently considered to have emerged from a bat coronavirus reservoir. However, the real natural cycle of this virus remains to be elucidated. Moreover, the COVID-19 pandemic has led to novel opportunities for SARS-CoV-2 transmission between humans and susceptible animal species. In silico and in vitro evaluation of the interactions between the SARS-CoV-2 spike protein and eucaryotic angiotensin-converting enzyme 2 (ACE2) receptor have tentatively predicted susceptibility to SARS-CoV-2 infection of several animal species. Although useful, these data do not always correlate with in vivo data obtained in experimental models or during natural infections. Other host biological properties may intervene such as the body temperature, level of receptor expression, co-receptor, restriction factors, and genetic background. The spread of SARS-CoV-2 also depends on the extent and duration of viral shedding in the infected host as well as population density and behaviour (group living and grooming). Overall, current data indicate that the most at-risk interactions between humans and animals for COVID-19 infection are those involving certain mustelids (such as minks and ferrets), rodents (such as hamsters), lagomorphs (especially rabbits), and felines (including cats). Therefore, special attention should be paid to the risk of SARS-CoV-2 infection associated with pets.

scholarly journals In vivo and in vitro models of traumatic injuries of the spinal cord

2017 ◽  
Vol 5 (1) ◽  
pp. 87-93
Author(s):  
O. Rybachuk ◽  
I. Arkhypchuk ◽  
Yu. Lazarenko
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Traffic Accidents ◽  
Experimental Models ◽  
The Body ◽  
Nerve Tissue ◽  
Economic Losses ◽  
Cord Injury

In recent years, there is a growing interest in the mechanisms of regeneration of damaged nerve tissue, including the spinal cord, as its injuries are quite common due to traffic accidents, industrial injuries and military actions. Damage to the spinal cord results in the loss of functional activity of the body below the injury site, which affects person’s ability to self-service and significantly reduces its efficiency. The effects of spinal injuries annually cause significant social and economic losses worldwide, including Ukraine. The development of new treatments for pathologies of the central nervous system requires mandatory pre-testing of their effectiveness in experiments in vitro and in vivo. Therefore, searching and creation of optimal animal model of spinal cord injury is in order to it meets most complete picture of the damage characteristic of real conditions in humans. This is an important task of modern neurophysiology. Such models can be used, primarily, for a more detailed clarification of the pathogenesis of all levels of nerve tissue damage and research of its own recovery potential by endogenous reparation mechanisms. In addition, experimental models allow to estimate the safety and predict the effectiveness of various therapeutic approaches to spinal cord injury.

scholarly journals Chemokine and chemokine receptor expression during colony stimulating factor-1–induced osteoclast differentiation in the toothless osteopetrotic rat: a key role for CCL9 (MIP-1γ) in osteoclastogenesis in vivo and in vitro

Blood ◽  
2006 ◽  
Vol 107 (6) ◽  
pp. 2262-2270 ◽  
Author(s):  
Meiheng Yang ◽  
Geneviève Mailhot ◽  
Carole A. MacKay ◽  
April Mason-Savas ◽  
Justin Aubin ◽  
...  
Keyword(s):  
Osteoclast Differentiation ◽  
The Body ◽  
Receptor Expression ◽  
Long Bone ◽  
Tartrate Resistant Acid Phosphatase ◽  
Colony Stimulating Factor ◽  
Cell Counts ◽  
Stimulating Factor

AbstractOsteoclasts differentiate from hematopoietic precursors under systemic and local controls. Chemokines and receptors direct leukocyte traffic throughout the body and may help regulate site-specific bone resorption. We investigated bone gene expression in vivo during rapid osteoclast differentiation induced by colony-stimulating factor 1 (CSF-1) in Csf1-null toothless (tl/tl) rats. Long-bone RNA from CSF-1–treated tl/tl rats was analyzed by high-density microarray over a time course. TRAP (tartrate-resistant acid phosphatase)–positive osteoclasts appeared on day 2, peaked on day 4, and decreased slightly on day 6, as marrow space was expanding. TRAP and cathepsin K mRNA paralleled the cell counts. We examined all chemokine and receptor mRNAs on the arrays. CCL9 was strongly induced and peaked on day 2, as did its receptor, CCR1, and regulatory receptors c-Fms (CSF-1 receptor) and RANK (receptor activator of nuclear factor κB). Other chemokines and receptors showed little or no significant changes. In situ hybridization and immunohistochemistry revealed CCL9 in small, immature osteoclasts on day 2 and in mature cells at later times. Anti-CCL9 antibody inhibited osteoclast differentiation in culture and significantly suppressed the osteoclast response in CSF-1–treated tl/tl rats. While various chemokines have been implicated in osteoclastogenesis in vitro, this first systematic analysis of chemokines and receptors during osteoclast differentiation in vivo highlights the key role of CCL9 in this process.

scholarly journals Study of enterobacteria biofilms critical point control technologies livestock and food production

2021 ◽  
Vol 2 (3) ◽  
pp. 12-25
Author(s):  
Ekaterina Mikhailovna Lenchenko ◽  
Dmitry Alekseevich Blumenkrants
Keyword(s):  
Critical Points ◽  
Food Production ◽  
Phase Contrast ◽  
Animal Species ◽  
Raw Materials ◽  
Susceptible Animal ◽  
Functional Patterns ◽  
Uncultured Microorganisms

The relevance of the study and the presence of gaps in the existing knowledge on the topic. Monitoring studies of the biological safety of food raw materials for microbiological indicators is an urgent problem due to the increase in the number registered diseases transmitted to humans through raw materials and products of animal origin. There is a tendency for a statistically significant increase in epidemiological indicators throughout the world, the proportion of these pathologies is increasing both in humane medicine and veterinary medicine. The aim of the work is a comparative assessment and selection of effective methods for studying the formation biofilms enterobacteriaceae circulating among susceptible animal species and isolated from food raw materials.Methods. Аnalysis of growth and dynamics development biofilms Enterobacteriaceae was carried out during cultivation on nutrient media containing growth factors for the repair of the cell wall and the reversal viable uncultured microorganisms. To study the morphological and functional patterns of the development a population microorganisms in vitro and in vivo, we used the conventional and developed methods for preparing preparations for scanning, transmission phase contrast, optical and luminescence microscopy.Results and its discussion. During microbiological control critical points in the technology of animal husbandry and food production, the morphological and functional characteristics biofilms, which are communities microorganisms secreting a polymer matrix and adhered to the tissues of susceptible animal species and abiotic surfaces livestock buildings and food industries, were studied. The developed methods of biofilm cultivation made it possible to study enterobacteriaceae biofilms in vitro and in vivo, without disturbing the natural architectonics of the population microorganisms, to determine the components extracellular matrix. For the study dynamics morphological and functional patterns of the development populations microorganisms, routine and technological advances present are recognized as promising, for example, scanning electron microscopy makes it possible to assess the degree of formation and morphological composition biofilms. Phase contrast microscopy to reveal processes depending on the composition medium and the oxygen content in the culture medium.Conclusions. Methods for cultivating biofilms in vitro and in vivo without disturbing the natural architectonics of biofilms made it possible to optimize the preparation samples for research and eliminate the routine stages of colony counting, and significantly increase the number of analyzes. Due to the simplicity of operations and minimization manual labor, productivity increases, safety of work is increased, cost of personnel working time is reduced, and subjective factors are excluded. For the development of a complex antiepizootic and diagnostic measures, a priority direction is the disclosure of scientific knowledge in the field fundamental studies of ecological plasticity and adaptation potentially pathogenic enterobacteria to parasitism in the warm-blooded organism of birds and mammals. This will allow solving applied problems controlling the critical points of livestock and food production technology, developing effective chemotherapeutic and disinfecting drugs to reduce cell coaggregation and detect viable uncultured microorganisms. 

scholarly journals Gold Nanoclusters Display Low Immunogenic Effect in Microglia Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1066
Author(s):  
Joanna Sobska ◽  
Magdalena Waszkielewicz ◽  
Anna Podleśny-Drabiniok ◽  
Joanna Olesiak-Banska ◽  
Wojciech Krężel ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Interleukin 1 ◽  
Gold Nanoclusters ◽  
Biological Properties ◽  
The Body ◽  
Great Promise ◽  
Low Toxicity ◽  
Anti Inflammatory

Gold nanoparticles hold a great promise for both clinical and preclinical applications. The major factors impeding such applications are toxicity of new nanomaterials including e.g., pro-apoptotic activities or inflammatory effects, but also their potential to accumulate in the body or inadequate absorption, distribution, metabolism and excretion (ADME) profiles. Since such adverse effects depend on the size, form and coating of nanomaterials, the search for new, less toxic nanomaterials with low tendency to accumulate is highly active domain of research. Here, we describe optical and biological properties of Au18 gold nanoclusters (NCs), small gold nanoparticles composed of 18 atoms of gold and stabilized with glutathione ligands. These nanoclusters may be suitable for in vivo applications owing to their low toxicity and biodistribution profile. Specifically, using lactate dehydrogenase (LDH) test in P19 cell line we found that Au18 NCs display low toxicity in vitro. Importantly, using primary microglial cells we showed that at low concentrations Au18 NCs display anti-inflammatory signaling on evidence of reduced interleukin 1-β (IL1-β) levels and unchanged levels of tumor necrosis factor (TNF-α) or Ym1/2. Such effect was dose dependent as higher concentrations of Au18 NCs induced expression of pro-inflammatory cytokines and suppression of anti-inflammatory cytokine Ym1/2, pointing, thus, to global inflammatory activity. Finally, we also showed that within 3 days Au18 NCs can be completely eliminated from the liver reported as the major target organ for accumulation of gold nanoparticles. These data point to a potential of gold nanoparticles for further biomedical studies.

Nanosponges Encapsulated Phytochemicals for Targeting Cancer: A Review

2020 ◽  
Vol 21 ◽  
Author(s):  
Shailaja Dombe ◽  
Pramodkumar Shirote
Keyword(s):  
Drug Delivery ◽  
Anticancer Agents ◽  
Biological Properties ◽  
The Body ◽  
Special Focus ◽  
Cancer Therapies ◽  
Nanostructured Particles ◽  
Inorganic Systems

Abstract: Cancer is the most ruinous disease globally. Natural products have impressive characteristics, such as excep-tional chemical versatility, chemical and biological properties of macromolecular specificity and less toxicity which make them good leads in finding novel drugs. The phytochemicals not only help to prevent but also treat chronic cancerous conditions. The present review attempts to put forth some selected anticancer phytochemicals that had reported omics char-acteristic and specifically suppressed cancer with in vitro and in vivo activity. Certain issues pertaining to anticancer phy-tochemicals like delivery to target site in the body and achieving controlled release in order to prevent overdoses havelong been a concern for medical researchers worldwide. The most conventional chemotherapy protocols for the treatment of cancer lead to adverse effects that limit biological efficacy and compromise patient outcomes. In order to defeat incompe-tency of current and upcoming natural anticancer agents and to attain targeted drug delivery with good efficacy and fewer side effects, there is a special focus on novel nanostructured particles and nano approaches consisting of carrier system. Recent studies have led to the discovery of mesoporous and nanoporous drug delivery mechanisms, such as inorganic or organic-based nanosponges. The metal based inorganic systems have exhibited toxicity and non-biodegradable character in vivo. As a result of problems related to inorganic systems, major shift of research from inorganic to organic nanosystems has occurred. About decades ago, researchers have developed organic nanosponges to control the limitation of drug delivery and cancer therapies. This review article discusses the development and application of nanosponges encapsulated phyto-chemicals for cancer therapy.

scholarly journals Biological Properties of Milk-Derived Extracellular Vesicles and Their Physiological Functions in Infant

2021 ◽  
Vol 9 ◽  
Author(s):  
Xue Jiang ◽  
Lianghui You ◽  
Zhenxing Zhang ◽  
Xianwei Cui ◽  
Hong Zhong ◽  
...  
Keyword(s):  
Breast Milk ◽  
Extracellular Vesicles ◽  
Messenger Rna ◽  
Metabolic Diseases ◽  
Biological Properties ◽  
Current Status ◽  
Physiological Functions ◽  
Obesity And Diabetes

Extracellular vesicles (EVs) are released by all cells under pathological and physiological conditions. EVs harbor various biomolecules, including protein, lipid, non-coding RNA, messenger RNA, and DNA. In 2007, mRNA and microRNA (miRNA) carried by EVs were found to have regulatory functions in recipient cells. The biological function of EVs has since then increasingly drawn interest. Breast milk, as the most important nutritional source for infants, contains EVs in large quantities. An increasing number of studies have provided the basis for the hypothesis associated with information transmission between mothers and infants via breast milk-derived EVs. Most studies on milk-derived EVs currently focus on miRNAs. Milk-derived EVs contain diverse miRNAs, which remain stable both in vivo and in vitro; as such, they can be absorbed across different species. Further studies have confirmed that miRNAs derived from milk-derived EVs can resist the acidic environment and enzymatic hydrolysis of the digestive tract; moreover, they can be absorbed by intestinal cells in infants to perform physiological functions. miRNAs derived from milk EVs have been reported in the maturation of immune cells, regulation of immune response, formation of neuronal synapses, and development of metabolic diseases such as obesity and diabetes. This article reviews current status and advances in milk-derived EVs, including their history, biogenesis, molecular contents, and biological functions. The effects of milk-derived EVs on growth and development in both infants and adults were emphasized. Finally, the potential application and future challenges of milk-derived EVs were discussed, providing comprehensive understanding and new insight into milk-derived EVs.

scholarly journals THE MODE OF ACTION OF SULFANILAMIDE ON STREPTOCOCCUS. II

1939 ◽  
Vol 69 (5) ◽  
pp. 607-624 ◽  
Author(s):  
Frederick P. Gay ◽  
Ada R. Clark ◽  
Julia A. Street ◽  
Dorothy W. Miles
Keyword(s):  
Mononuclear Cells ◽  
Gentian Violet ◽  
Test Tube ◽  
The Body ◽  
Experimental Conditions ◽  
Susceptible Animal ◽  
Variable Factor ◽  
Relationship Of

The precise mode of therapeutic action of sulfanilamide on streptococcus can be arrived at only by considering the sum total of factors that inhibit or favor the natural growth of the microorganism under the experimental conditions that obtain, whether in vivo or in vitro. Too sweeping conclusions have hitherto been drawn from the study of a single variable factor, such as an unfavorable temperature or the absence or presence of peptone. We have attempted here to analyze the factors that have hitherto been recognized and some new ones, but particularly the relationship of these factors to one another. The result obtained on adding sulfanilamide to the streptococcus in the test tube is usually bacteriostasis and not complete destruction of even small numbers of bacteria. This is on the condition that the suspending medium is a favorable one for the growth of the microorganism; the more growth-promoting the medium is the less the bacteriostasis. If, on the other hand, the medium is too poor, or one that in itself inhibits growth, the addition of sulfanilamide may lead to sterilization of the culture. The conditions for growth of the streptococcus in the body of the rabbit or mouse, depend on the strain of bacteria used, but are on the whole favorable. Defence, however, in the form of phagocytosis by both polymorphonuclear and by mononuclear cells is attempted even in the susceptible animal. When sulfanilamide is used to treat such an animal, or when sulfanilamide-grown (inhibited) streptococci are employed, phagocytosis is pronounced, whether studied in the test tube or in the animal body. In the rabbit the delay by sulfanilamide and resultant increased phagocytosis by polymorphonuclears allows mononuclear cells to accumulate and recovery may result. Sulfanilamide not only does not completely destroy the streptococcus but does not even impair its innate virulence. It acts upon the streptococcus not only by inhibiting growth but by a temporary inhibition of hemotoxin formation, but only under certain conditions. The drug does not neutralize hemotoxin already formed. No significant effect of sulfanilamide on the formation of leucocidin or fibrinolysin by streptococcus has been evident in our experiments. Sulfanilamide differs in one important respect from other drugs that are destructive either in the test tube or actually in the body, for protozoa and bacteria. Protozoa fix or adsorb arsenicals and acriflavine that kill them variably in vitro and in vivo. Streptococci fix both gentian violet and acriflavine, which dyes have marked destructive action in the test tube but are less effective in vivo. Sulfanilamide is not diminished at all by contact in vitro with large masses of streptococci, nor does the action of this drug render the microorganism more capable than untreated cocci to adsorb gentian violet or acriflavine, or to be destroyed by these highly bactericidal substances.

scholarly journals Overview of P-glycoprotein inhibitors: a rational outlook

2012 ◽  
Vol 48 (3) ◽  
pp. 353-367 ◽  
Author(s):  
Kale Mohana Raghava Srivalli ◽  
P. K. Lakshmi
Keyword(s):  
In Silico ◽  
Quantitative Structure Activity Relationship ◽  
Experimental Models ◽  
The Body ◽  
Diverse Range ◽  
Active Efflux ◽  
Chemical Structures ◽  
P Glycoprotein

P-glycoprotein (P-gp), a transmembrane permeability glycoprotein, is a member of ATP binding cassette (ABC) super family that functions specifically as a carrier mediated primary active efflux transporter. It is widely distributed throughout the body and has a diverse range of substrates. Several vital therapeutic agents are substrates to P-gp and their bioavailability is lowered or a resistance is induced because of the protein efflux. Hence P-gp inhibitors were explored for overcoming multidrug resistance and poor bioavailability problems of the therapeutic P-gp substrates. The sensitivity of drug moieties to P-gp and vice versa can be established by various experimental models in silico, in vitro and in vivo. Ever since the discovery of P-gp, the research plethora identified several chemical structures as P-gp inhibitors. The aim of this review was to emphasize on the discovery and development of newer, inert, non-toxic, and more efficient, specifically targeting P-gp inhibitors, like those among the natural herb extracts, pharmaceutical excipients and formulations, and other rational drug moieties. The applications of cellular and molecular biology knowledge, in silico designed structural databases, molecular modeling studies and quantitative structure-activity relationship (QSAR) analyses in the development of novel rational P-gp inhibitors have also been mentioned.

scholarly journals Experimental Models of Sarcopenia: Bridging Molecular Mechanism and Therapeutic Strategy

Cells ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1385 ◽  
Author(s):  
Sakulrat Mankhong ◽  
Sujin Kim ◽  
Sohee Moon ◽  
Hyo-Bum Kwak ◽  
Dong-Ho Park ◽  
...  
Keyword(s):  
Molecular Mechanisms ◽  
Functional Disability ◽  
Molecular Targets ◽  
Therapeutic Strategies ◽  
Experimental Models ◽  
Current Status ◽  
Drug Candidates ◽  
Novel Therapeutic Strategies

Sarcopenia has been defined as a progressive decline of skeletal muscle mass, strength, and functions in elderly people. It is accompanied by physical frailty, functional disability, falls, hospitalization, and mortality, and is becoming a major geriatric disorder owing to the increasing life expectancy and growing older population worldwide. Experimental models are critical to understand the pathophysiology of sarcopenia and develop therapeutic strategies. Although its etiologies remain to be further elucidated, several mechanisms of sarcopenia have been identified, including cellular senescence, proteostasis imbalance, oxidative stress, and “inflammaging.” In this article, we address three main aspects. First, we describe the fundamental aging mechanisms. Next, we discuss both in vitro and in vivo experimental models based on molecular mechanisms that have the potential to elucidate the biochemical processes integral to sarcopenia. The use of appropriate models to reflect sarcopenia and/or its underlying pathways will enable researchers to understand sarcopenia and develop novel therapeutic strategies for sarcopenia. Lastly, we discuss the possible molecular targets and the current status of drug candidates for sarcopenia treatment. In conclusion, the development of experimental models for sarcopenia is essential to discover molecular targets that are valuable as biochemical biomarkers and/or therapeutic targets for sarcopenia.

The Role of Polyphenols in the Modulation of Plasma Non-Enzymatic Antioxidant Capacity (NEAC)

2012 ◽  
Vol 82 (3) ◽  
pp. 228-232 ◽  
Author(s):  
Mauro Serafini ◽  
Giuseppa Morabito
Keyword(s):  
Antioxidant Capacity ◽  
Dietary Intervention ◽  
Ex Vivo ◽  
The Body ◽  
Dietary Polyphenols ◽  
Enzymatic Antioxidant ◽  
Endogenous Antioxidant

Dietary polyphenols have been shown to scavenge free radicals, modulating cellular redox transcription factors in different in vitro and ex vivo models. Dietary intervention studies have shown that consumption of plant foods modulates plasma Non-Enzymatic Antioxidant Capacity (NEAC), a biomarker of the endogenous antioxidant network, in human subjects. However, the identification of the molecules responsible for this effect are yet to be obtained and evidences of an antioxidant in vivo action of polyphenols are conflicting. There is a clear discrepancy between polyphenols (PP) concentration in body fluids and the extent of increase of plasma NEAC. The low degree of absorption and the extensive metabolism of PP within the body have raised questions about their contribution to the endogenous antioxidant network. This work will discuss the role of polyphenols from galenic preparation, food extracts, and selected dietary sources as modulators of plasma NEAC in humans.

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