scholarly journals Natural resources to control COVID-19: could lactoferrin amend SARS-CoV-2 infectivity?

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11303
Author(s):  
Ehab H. Mattar ◽  
Fatma Elrashdy ◽  
Hussein A. Almehdar ◽  
Vladimir N. Uversky ◽  
Elrashdy M. Redwan
Keyword(s):  
Cellular Systems ◽  
The Body ◽  
World Population ◽  
The Past ◽  
Asymptomatic Patients ◽  
Associated Symptoms ◽  
Second Wave

The world population is still facing the second wave of the COVID-19 pandemic. Such a challenge requires complicated tools to control, namely vaccines, effective cures, and complementary agents. Here we present one candidate for the role of an effective cure and/or complementary agent: lactoferrin. It is the cross-talking mediator between many organs/cellular systems in the body. It serves as a physiological, immunological, and anti-microbial barrier, and acts as a regulator molecule. Furthermore, lactoferrin has receptors on most tissues cells, and is a rich source for bioactive peptides, particularly in the digestive system. In the past months, in vitro and in vivo evidence has accumulated regarding lactoferrin’s ability to control SARS-CoV-2 infectivity in different indicated scenarios. Also, lactoferrin or whey milk (of human or other mammal’s origin) is a cheap, easily available, and safe agent, the use of which can produce promising results. Pharmaceutical and/or food supplementary formulas of lactoferrin could be particularly effective in controlling the gastrointestinal COVID-19-associated symptoms and could limit the fecal-oral viral infection transmission, through mechanisms that mimic that of norovirus infection control by lactoferrin via induction of intestinal innate immunity. This natural avenue may be effective not only in symptomatic patients, but could also be more helpful in asymptomatic patients as a main or adjuvant treatment.

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.

scholarly journals Medawar’s PostEra: Galectins Emerged as Key Players During Fetal-Maternal Glycoimmune Adaptation

2021 ◽  
Vol 12 ◽  
Author(s):  
Ellen Menkhorst ◽  
Nandor Gabor Than ◽  
Udo Jeschke ◽  
Gabriela Barrientos ◽  
Laszlo Szereday ◽  
...  
Keyword(s):  
Immune Cell ◽  
Successful Pregnancy ◽  
Fetal Health ◽  
The Past ◽  
Mammalian Embryogenesis ◽  
Carbohydrate Ligands ◽  
Membrane Bound

Lectin-glycan interactions, in particular those mediated by the galectin family, regulate many processes required for a successful pregnancy. Over the past decades, increasing evidence gathered from in vitro and in vivo experiments indicate that members of the galectin family specifically bind to both intracellular and membrane bound carbohydrate ligands regulating angiogenesis, immune-cell adaptations required to tolerate the fetal semi-allograft and mammalian embryogenesis. Therefore, galectins play important roles in fetal development and placentation contributing to maternal and fetal health. This review discusses the expression and role of galectins during the course of pregnancy, with an emphasis on maternal immune adaptions and galectin-glycan interactions uncovered in the recent years. In addition, we summarize the galectin fingerprints associated with pathological gestation with particular focus on preeclampsia.

Embryo biotechnology in the dog: a review

2010 ◽  
Vol 22 (7) ◽  
pp. 1049 ◽  
Author(s):  
Sylvie Chastant-Maillard ◽  
Martine Chebrout ◽  
Sandra Thoumire ◽  
Marie Saint-Dizier ◽  
Marc Chodkiewicz ◽  
...  
Keyword(s):  
Mammalian Species ◽  
Embryonic Stem ◽  
Reproductive Technologies ◽  
Reproductive Physiology ◽  
Biological Models ◽  
The Past ◽  
Fertilisation Rate

Canine embryos are a scarce biological material because of difficulties in collecting in vivo-produced embryos and the inability, to date, to produce canine embryos in vitro. The procedure for the transfer of in vivo-produced embryos has not been developed adequately, with only six attempts reported in the literature that have resulted in the birth of 45 puppies. In vitro, the fertilisation rate is particularly low (∼10%) and the incidence of polyspermy particularly high. So far, no puppy has been obtained from an in vitro-produced embryo. In contrast, cloning of somatic cells has been used successfully over the past 4 years, with the birth of 41 puppies reported in the literature, a yield that is comparable to that for other mammalian species. Over the same period, canine embryonic stem sells and transgenic cloned dogs have been obtained. Thus, the latest reproductive technologies are further advanced than in vitro embryo production. The lack of fundamental studies on the specific features of reproductive physiology and developmental biology in the canine is regrettable in view of the increasing role of dogs in our society and of the current demand for new biological models in biomedical technology.

The role of pulmonary intravascular macrophages in porcine reproductive and respiratory syndrome virus infection

2000 ◽  
Vol 1 (2) ◽  
pp. 95-102 ◽  
Author(s):  
Roongroje Thanawongnuwech ◽  
Patrick G. Halbur ◽  
Eileen L. Thacker
Keyword(s):  
Virus Titer ◽  
Respiratory Syndrome Virus ◽  
The Past ◽  
Current State ◽  
Viral Particles ◽  
Increased Susceptibility ◽  
Pulmonary Intravascular Macrophages

AbstractThe objective of this article is to summarize the current state of knowledge of the complex interaction of porcine reproductive and respiratory syndrome virus (PRRSV) and porcine pulmonary intravascular macrophages (PIMs). PIMs play an important role in pulmonary surveillance, and in the past few years we have investigated their role in PRRSV infection. PRRSV antigens and nucleic acids have been demonstrated in PIMs bothin vitroandin vivo. Examination of cultured PIMs infected with PRRSV revealed the accumulation of viral particles in the smooth-walled vesicles. PRRSV-infected PIMsin vitroyielded a virus titer similar to pulmonary alveolar macrophages. PRRSV infection induces either apoptosis or cell lysis of PIMs. Thein vitrobactericidal activity of PRRSV-infected PIMs is significantly decreased. Phagocytic activity of PIMs, as measured by pulmonary copper clearance, is significantly decreased in PRRSV-infected pigs. This evidence supports the hypothesis that PRRSV-induced damage to PIMs results in increased susceptibility to bacteremic diseases. Recent studies with PRRSV andStreptococcus suiscoinfection confirmed that PRRSV predisposes pigs toS. suisinfection and bacteremia. These results could explain the increase in bacterial respiratory diseases and septicemias observed in PRRSV-infected pigs.

Nanofiber Micropatterns for Controlled Release of Biomolecules

2011 ◽  
Author(s):  
Walter Bonani ◽  
Claudio Migliaresi ◽  
Wei Tan
Keyword(s):  
The Body ◽  
Biodegradable Materials ◽  
Signal Molecules ◽  
3 Dimensional ◽  
The Past ◽  
Direct Delivery ◽  
And Function ◽  
Vascular Formation

Essential to growing or regenerating 3-dimensional tissues is the formation of functional microcirculation that provides nutrients, oxygen and signal molecules for tissue survival and function regeneration. In the past decade, molecule-based microvascular formation has been achieved in vitro and in vivo. However, direct delivery of angiogenic molecules often results in malformed hyperpermeable microvessels, microvessels with low density. This can be attributed to the lack of effective molecule mechanisms that regulate vascular formation. More recent studies utilize biodegradable materials to control the delivery of biomolecules for vascularization of engineered or ischemic tissues, and exciting results have shown the importance of molecule kinetics to the vascular formation. Molecule delivery mechanisms that mimic precisely-regulated spatiotemporal signaling events during natural vascularization may be a possible way to improve or optimize the process. Hence, this study is designed to develop a new release system capable of degrading in the body and releasing biomolecules in a spatiotemporally controlled manner.

scholarly journals Emerging era of microneedle array for pharmaceutical and biomedical applications: recent advances and toxicological perspectives

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Shailesh Dugam ◽  
Rahul Tade ◽  
Rani Dhole ◽  
Sopan Nangare
Keyword(s):  
Biomedical Applications ◽  
Microneedle Array ◽  
Bioavailability Enhancement ◽  
Main Text ◽  
The Past ◽  
Recent Advancement ◽  
Insight Into

Abstract Background Microneedles (MNs) are the utmost unique, efficient, and minimally invasive inventions in the pharmaceutical field. Over the past decades, many scientists around the globe have reported MNs cautious because of their superb future in distinct areas. Concerning the wise use of MNs herein, we deal in depth with the present applications of MNs in drug delivery. Main text The present review comprises various fabrication materials and methods used for MN synthesis. The article also noted the distinctive advantages of these MNs, which holds huge potential for pharmaceutical and biomedical applications. The role of MNs in serving as a platform to treat various ailments has been explained accompanied by unusual approaches. The review also inculcates the pharmacokinetics of MNs, which includes permeation, absorption, and bioavailability enhancement. Besides this, the in vitro/in vivo toxicity, biosafety, and marketed product of MNs have been reviewed. We have also discussed the clinical trials and patents on the pharmaceutical applications of MNs in brief. Conclusion To sum up, this article gives insight into the MNs and provides a recent advancement in MNs, which pave the pathway for future pharmaceutical and biomedical applications. Graphical abstract Pharmaceutical and biomedical applications of MNs

scholarly journals Role of Human Mesenchymal Stem Cells in Regenerative Therapy

Cells ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 54
Author(s):  
Jayavardini Vasanthan ◽  
Narasimman Gurusamy ◽  
Sheeja Rajasingh ◽  
Vinoth Sigamani ◽  
Shivaani Kirankumar ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Human Mesenchymal Stem Cells ◽  
The Body ◽  
The Past ◽  
Multipotent Cells ◽  
Mitochondrial Transfer ◽  
Quality Control Parameters

Mesenchymal stem cells (MSCs) are multipotent cells which can proliferate and replace dead cells in the body. MSCs also secrete immunomodulatory molecules, creating a regenerative microenvironment that has an excellent potential for tissue regeneration. MSCs can be easily isolated and grown in vitro for various applications. For the past two decades, MSCs have been used in research, and many assays and tests have been developed proving that MSCs are an excellent cell source for therapy. This review focusses on quality control parameters required for applications of MSCs including colony formation, surface markers, differentiation potentials, and telomere length. Further, the specific mechanisms of action of MSCs under various conditions such as trans-differentiation, cell fusion, mitochondrial transfer, and secretion of extracellular vesicles are discussed. This review aims to underline the applications and benefits of MSCs in regenerative medicine and tissue engineering.

scholarly journals Febrile temperatures increase in vitro antibody affinity for malaria and dengue antigens

2018 ◽  
Author(s):  
Razvan C. Stan ◽  
Katia S. Françoso ◽  
Rubens P.S. Alves ◽  
Luís Carlos S. Ferreira ◽  
Irene S. Soares ◽  
...  
Keyword(s):  
Immune Responses ◽  
Binding Affinity ◽  
The Body ◽  
Antibody Affinity ◽  
Positive Role ◽  
Protein Partners ◽  
Adaptive Role

AbstractFever is a regulated elevation in the body setpoint temperature and may arise as a result of infectious and noninfectious causes. While beneficial in modulating immune responses to infection, the potential of febrile temperatures in regulating antigen binding affinity to antibodies has not been explored. We have investigated this process under in vitro conditions using selected malaria or dengue antigens and specific monoclonal antibodies, and observed a marked increase in the affinity of these antibody-antigen complexes at 40°C, compared to physiological (37°C) or pathophysiological temperatures (42°C). Induced thermal equilibration of the protein partners at these temperatures, prior to measurements, further increased their binding affinity. These results may indicate an unexpected beneficial and adaptive role for fever in vivo, and highlight the positive role of thermal priming in enhancing protein-protein affinity for samples of scarce availability.

scholarly journals The role of the angiotensins in the pathogenesis of inflammatory joint disease

2021 ◽  
Vol 93 (5) ◽  
pp. 635-639
Author(s):  
Andrei V. Gordeev ◽  
Elena A. Galushko ◽  
Natalia M. Savushkina
Keyword(s):  
Cardiovascular System ◽  
The Body ◽  
Joint Disease ◽  
Renin Angiotensin Aldosterone System ◽  
Renin Angiotensin ◽  
In Vivo Experiments ◽  
Anti Inflammatory

The significant humoral effect of the renin-angiotensin-aldosterone system on the regulation of the cardiovascular system and blood pressure has long been widely known. However, the identification and interpretation of new components of renin-angiotensin-aldosterone system in recent years can significantly expand the range of its potential effects on the body. The anti-inflammatory effect of drugs that block angiotensin II and its receptors, including in rheumatic diseases, can become practically significant for General therapists by their effect on reducing the concentration of inflammatory mediators and angiogenesis processes. The organoprotective and anti-inflammatory potentials of drugs that reduce the production of at demonstrated in vitro and in vivo experiments allow us to consider them as first-line angiotropic agents in patients with rheumatoid arthritis, especially in the presence of pathology of the cardiovascular system and kidneys.

scholarly journals Potential Roles and Functions of Listerial Virulence Factors during Brain Entry

Toxins ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 297
Author(s):  
Franjo Banović ◽  
Horst Schroten ◽  
Christian Schwerk
Keyword(s):  
Virulence Factors ◽  
Current Knowledge ◽  
Cellular Adhesion ◽  
The Body ◽  
Listeriolysin O ◽  
The Brain ◽  
Adhesion And Invasion

Although it rarely induces disease in humans, Listeria monocytogenes (Lm) is important due to the frequency of serious pathological conditions—such as sepsis and meningitis—it causes in those few people that do get infected. Virulence factors (VF) of Lm—especially those involved in the passage through multiple cellular barriers of the body, including internalin (Inl) family members and listeriolysin O (LLO)—have been investigated both in vitro and in vivo, but the majority of work was focused on the mechanisms utilized during penetration of the gut and fetoplacental barriers. The role of listerial VF during entry into other organs remain as only partially solved puzzles. Here, we review the current knowledge on the entry of Lm into one of its more significant destinations, the brain, with a specific focus on the role of various VF in cellular adhesion and invasion.

Sign in / Sign up

Export Citation Format

Share Document