Impairment of gill structural integrity by manganese deficiency or excess related to induction of oxidative damage, apoptosis and dysfunction of the physical barrier as regulated by NF-κB, caspase and Nrf2 signaling in fish

2017 ◽  
Vol 70 ◽  
pp. 280-292 ◽  
Author(s):  
Wei-Dan Jiang ◽  
Ren-Jun Tang ◽  
Yang Liu ◽  
Pei Wu ◽  
Sheng-Yao Kuang ◽  
...  
RSC Advances ◽  
2020 ◽  
Vol 10 (45) ◽  
pp. 26709-26716
Author(s):  
Guangmang Liu ◽  
Weiwei Mo ◽  
Wei Cao ◽  
Xianjian Wu ◽  
Gang Jia ◽  
...  

Spermine, a polyamine, exerts important roles in alleviating oxidative damage, improving immunity, increasing antioxidant status and digestive enzyme activities, and promoting the development of small intestine.


2021 ◽  
Author(s):  
Fathima Hajee Basha ◽  
S. Hemalatha

Abstract Neurodegeneration may be defined as a clinical condition wherein neurons gradually lose their structural integrity, viability, functional abilities and the damage inflicted upon the neurons is often irreversible. The number of elderly patients suffering from Neurodegenerative disorders is expected to rise tremendously over the next couple of years. Thus, there is an urgent need to delve into and study the underlying cause and mechanisms, so that we may be able to develop more effective therapeutic strategies and drugs and better understand the origin and progression of the disease.The various mechanisms that have been observed to contribute to neurodegeneration include aggregation and accumulation of misfolded proteins, impaired autophagy, oxidative damage, neuroinflammation, mitochondrial defects, increased SUMOylation of proteins, impaired UPR pathways, disruption of axonal transport.Melatonin, a neurohormone is involved in a variety of functions including scavenging free radicals, synchronizing the circadian rhythm, mitigating immune response.Melatonin has shown to modulate the UPR pathway ,antioxidant pathway through Nrf2 and inflammatory pathway through NFκB. The study aims to determine the efficacy of melatonin on neurodegeneration mediated by ER stress, inflammation and oxidative damage through in silico approaches. The molecular targets chosen were ATF6, XBP1, PERK, Nrf2, NFκB and they were docked against melatonin. Additionally various physiochemical analysis such as ADME were also carried out to determine its drug ability. The findings were that melatonin not only shows excellent interactions with the targets but also possess drug-like physicochemical properties that makes it a valuable choice for the treatment of neurodegenerative disorders.


Author(s):  
Vitaly O. Kheyfets ◽  
Sarah L. Kieweg

Developing a mechanism capable of protecting the vaginal or rectal epithelium from sexually transmitted pathogens can be an effective tool in the prevention of HIV infection [1]. One such tool can come in the form of a microbicide gel, which provides a physical barrier and acts as a delivery vehicle for its active ingredient [1]. In order for the microbicide to be an effective barrier and delivery vehicle, it must have the capability to coat the epithelium for a specific amount of time and sustain its structural integrity under the influence of gravity and other perturbation forces. In addition, to be used as a drug delivery vehicle the microbicide must serve the following functions: coat the surface completely without leaving any of the surface exposed, stay on the surface while influenced by external forces such as gravity and squeezing, and must be able to contain potent concentrations of one or more active microbicidal ingredients.


Author(s):  
Vitaly O. Kheyfets ◽  
Sarah L. Kieweg

Developing a mechanism capable of protecting the vaginal or rectal epithelium from sexually transmitted pathogens can be an effective tool in the prevention of HIV infection [1]. One such tool can come in the form of a microbicide gel, used to provide a physical barrier and act as a delivery vehicle for its active ingredient [1]. In order for the microbicide to be an effective barrier and delivery vehicle it must have the capability to coat the epithelium for a specific amount of time and sustain its structural integrity under the influence of gravity and other perturbation forces. In addition, to be used as a drug delivery vehicle the microbicide must serve the following functions: coat the surface completely without leaving any of the surface exposed, stay on the surface while influenced by external forces such as gravity and squeezing, and must be able to contain potent concentrations of one or more active microbicidal ingredients.


2018 ◽  
Vol 63 (No. 7) ◽  
pp. 247-255 ◽  
Author(s):  
E. Tvrdá ◽  
H. Greifová ◽  
A. Mackovich ◽  
F. Hashim ◽  
N. Lukáč

Evidence shows that oxidative stress associated with sperm cryopreservation may lead to a significant decrease of the structural integrity and functional activity of male gametes. Curcumin (CUR) has become a substance of scientific interest for its free radical-quenching abilities, which could enhance the post-thaw quality of male gametes. This study assessed the effects of CUR on the post-thaw vitality and selected oxidative stress markers of bovine spermatozoa. Thirty ejaculates collected from 10 breeding bulls were divided into two aliquots and cryopreserved in the absence (control) or presence of CUR (50 μmol/l). Immediately before use, the control or experimental straws were thawed at 37°C for 20 s. CUR administration led to a significantly higher preservation of spermatozoa motion (P < 0.001) as well as membrane (P < 0.05) and acrosomal (P < 0.01) integrity in comparison with the control. Moreover, spermatozoa exposed to CUR exhibited a significantly higher mitochondrial activity (P < 0.001). Significantly decreased amounts of reactive oxygen species (P < 0.01) and superoxide (P < 0.001) were detected following CUR supplementation. Finally, a significant decrease of oxidative damage to proteins (P < 0.01), lipids (P < 0.001), and DNA (P < 0.05) was recorded in samples to which CUR was administered in comparison to the control. In this study, CUR proved to act as an efficient antioxidant molecule offering protection to male gametes against oxidative damage during cryopreservation.


2021 ◽  
Vol 118 (11) ◽  
pp. e2022422118
Author(s):  
Hui Li ◽  
Yue Zheng ◽  
Yu Long Han ◽  
Shengqiang Cai ◽  
Ming Guo

Basement membrane (BM) is a thin layer of extracellular matrix that surrounds most animal tissues, serving as a physical barrier while allowing nutrient exchange. Although they have important roles in tissue structural integrity, physical properties of BMs remain largely uncharacterized, which limits our understanding of their mechanical functions. Here, we perform pressure-controlled inflation and deflation to directly measure the nonlinear mechanics of BMs in situ. We show that the BMs behave as a permeable, hyperelastic material whose mechanical properties and permeability can be measured in a model-independent manner. Furthermore, we find that BMs exhibit a remarkable nonlinear stiffening behavior, in contrast to the reconstituted Matrigel. This nonlinear stiffening behavior helps the BMs to avoid the snap-through instability (or structural softening) widely observed during the inflation of most elastomeric balloons and thus maintain sufficient confining stress to the enclosed tissues during their growth.


Author(s):  
M. Isaacson ◽  
M.L. Collins ◽  
M. Listvan

Over the past five years it has become evident that radiation damage provides the fundamental limit to the study of blomolecular structure by electron microscopy. In some special cases structural determinations at very low doses can be achieved through superposition techniques to study periodic (Unwin & Henderson, 1975) and nonperiodic (Saxton & Frank, 1977) specimens. In addition, protection methods such as glucose embedding (Unwin & Henderson, 1975) and maintenance of specimen hydration at low temperatures (Taylor & Glaeser, 1976) have also shown promise. Despite these successes, the basic nature of radiation damage in the electron microscope is far from clear. In general we cannot predict exactly how different structures will behave during electron Irradiation at high dose rates. Moreover, with the rapid rise of analytical electron microscopy over the last few years, nvicroscopists are becoming concerned with questions of compositional as well as structural integrity. It is important to measure changes in elemental composition arising from atom migration in or loss from the specimen as a result of electron bombardment.


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