scholarly journals Spiny mice (Acomys) exhibit attenuated hallmarks of aging and rapid cell turnover after UV exposure in the skin epidermis

2020 ◽  
Author(s):  
Wesley Wong ◽  
Austin Kim ◽  
Ashley W. Seifert ◽  
Malcolm Maden ◽  
Justin D. Crane
Keyword(s):  
Tissue Injury ◽  
Cell Turnover ◽  
Skin Damage ◽  
Inflammatory Signaling ◽  
Chronological Aging ◽  
Spiny Mice ◽  
Age Related ◽  
Epidermal Turnover ◽  
Uvb Exposure ◽  
Skin Epidermis

AbstractThe study of long-lived and regenerative animal models has revealed diverse protective responses to stressors such as aging and tissue injury. Spiny mice (Acomys) are a unique mammalian model of skin regeneration, but their response to other types of physiological skin damage have not been investigated. In this study, we examine how spiny mice skin responds to acute UVB damage or chronological aging compared to non-regenerative C57Bl/6 mice (M. musculus). We find that, compared to M. musculus, the skin epidermis in A. cahirinus experiences a similar UVB-induced increase in basal cell proliferation but exhibits increased epidermal turnover. Notably, A. cahirinus uniquely form a suprabasal layer co-expressing Keratin 14 and Keratin 10 after UVB exposure concomitant with reduced epidermal inflammatory signaling and reduced markers of DNA damage. In the context of aging, old M. musculus animals exhibit typical hallmarks including epidermal thinning, increased inflammatory signaling and senescence. However, these age-related changes are absent in old A. cahirinus skin. Overall, we find that A. cahirinus have evolved novel responses to skin damage that reveals new aspects of its regenerative phenotype.

scholarly journals Spiny mice (Acomys) exhibit attenuated hallmarks of aging and rapid cell turnover after UV exposure in the skin epidermis

PLoS ONE ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. e0241617
Author(s):  
Wesley Wong ◽  
Austin Kim ◽  
James R. Monaghan ◽  
Ashley W. Seifert ◽  
Malcolm Maden ◽  
...  
Keyword(s):  
Uv Exposure ◽  
Cell Turnover ◽  
Spiny Mice ◽  
Skin Epidermis

scholarly journals Carotenoids in the Management of Glaucoma: A Systematic Review of the Evidence

Nutrients ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1949
Author(s):  
Drake W. Lem ◽  
Dennis L. Gierhart ◽  
Pinakin Gunvant Davey
Keyword(s):  
Systematic Review ◽  
Tissue Injury ◽  
Open Angle Glaucoma ◽  
Synaptic Activity ◽  
Antioxidant Defenses ◽  
Cochrane Library ◽  
Retinal Ganglion ◽  
Age Related ◽  
Retinal Ganglion Cell Survival ◽  
Oxidative Insult

Primary open-angle glaucoma (POAG) remains a leading cause of irreversible blindness globally. Recent evidence further substantiates sustained oxidative stress, and compromised antioxidant defenses are key drivers in the onset of glaucomatous neurodegeneration. Overwhelming oxidative injury is likely attributed to compounding mitochondrial dysfunction that worsens with age-related processes, causing aberrant formation of free radical species. Thus, a compromised systemic antioxidant capacity exacerbates further oxidative insult in glaucoma, leading to apoptosis, neuroinflammation, and subsequent tissue injury. The purpose of this systematic review is to investigate the neuroprotective benefits of the macular carotenoids lutein, zeaxanthin, and meso-zeaxanthin on glaucomatous neurodegeneration for the purpose of adjunctive nutraceutical treatment in glaucoma. A comprehensive literature search was conducted in three databases (PubMed, Cochrane Library, and Web of Science) and 20 records were identified for screening. Lutein demonstrated enhanced neuroprotection on retinal ganglion cell survival and preserved synaptic activity. In clinical studies, a protective trend was seen with greater dietary consumption of carotenoids and risk of glaucoma, while greater carotenoid levels in macular pigment were largely associated with improved visual performance in glaucomatous eyes. The data suggest that carotenoid vitamin therapy exerts synergic neuroprotective benefits and has the capacity to serve adjunctive therapy in the management of glaucoma.

scholarly journals The age-related increase in renal clusterin mRNA is accelerated in obese Zucker rats.

1998 ◽  
Vol 9 (1) ◽  
pp. 38-45 ◽  
Author(s):  
N J Laping ◽  
B A Olson ◽  
J R Day ◽  
B M Brickson ◽  
L C Contino ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Tissue Injury ◽  
Rat Kidney ◽  
Zucker Rats ◽  
Mrna Levels ◽  
Zucker Rat ◽  
Age Related ◽  
Obese Zucker Rat ◽  
Obese Zucker Rats ◽  
F344 Rats

Clusterin is a multifunctional glycoprotein associated with development and tissue injury. Because renal function decreases with advancing age in the obese Zucker rat, clusterin mRNA expression was examined in the kidney of young adult Zucker rats and compared with age-related changes in renal clusterin mRNA expression in Fischer 344 (F344) rats. Renal clusterin mRNA levels in the obese Zucker rat were 2.5-fold higher by 3 mo of age and fourfold higher at 5 mo of age compared with the lean strain. In comparison, renal clusterin mRNA in 12-mo-old F344 rats was twofold higher than in 3-mo-old animals and was tenfold higher at 24 mo of age. Clusterin mRNA was positively correlated with urinary protein excretion and negatively correlated with creatinine clearance in Zucker rats. Clusterin was increased in select nephrons of the obese Zucker rat kidney and in 24-mo-old F344 rat kidney as assessed by in situ hybridization. Increased expression of clusterin mRNA occurred mostly in the tubular epithelium of dilated, convoluted proximal tubules. These data indicate that renal clusterin mRNA levels increase as a function of age and that age-related increases in renal clusterin and the associated tubular abnormalities are accelerated in obese Zucker rats.

Improved clinical outcomes in pressure ulcer prevention using the SEM scanner

2019 ◽  
Vol 28 (5) ◽  
pp. 278-282 ◽  
Author(s):  
Glenn Smith
Keyword(s):  
Risk Assessment ◽  
Patient Outcomes ◽  
Pressure Ulcer ◽  
Tissue Injury ◽  
Skin Damage ◽  
Pressure Ulcer Prevention ◽  
Surgical Ward ◽  
Objective Evidence ◽  
Prevention Interventions ◽  
Assessment Strategies

Objective: An in-practice evaluation of an sub-epidermal moisture (SEM) scanner, to detect non-visible pressure damage, allowing appropriate, targeted pressure ulcer (PU) prevention interventions. Method: The evaluation included patients on a single medical-surgical ward over a period of two months. Results: The evaluation included 35 patients. The outcomes of the evaluation suggest that the SEM scanner provided objective evidence that both the interventions being employed and the increase in repositioning and assessment prevented further incipient skin damage. Conclusion: We conclude that the early detection of non-visible tissue injury using the SEM scanner as an adjunct to the usual PU risk assessment strategies can reduce PU incidence, leading to improved patient outcomes and released productivity.

Effect of Ischemia and Reperfusion on Skeletal Muscle Damage

2010 ◽  
Author(s):  
Sandra Loerakker ◽  
Emmy Manders ◽  
Gustav J. Strijkers ◽  
Frank P. T. Baaijens ◽  
Dan L. Bader ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Damage ◽  
Soft Tissues ◽  
Ischemia Reperfusion Injury ◽  
Tissue Injury ◽  
Ischemia Reperfusion ◽  
Ischemia And Reperfusion ◽  
Skin Damage ◽  
Deep Tissue ◽  
Skeletal Muscle Damage

Sustained mechanical loading of soft tissues covering bony prominences, as experienced by bedridden and wheelchair-bound individuals, may cause skeletal muscle damage. This can result in a condition termed pressure-related deep tissue injury (DTI), a severe kind of pressure ulcer that initiates in deep tissue layers, and progresses towards the skin. Damage pathways leading to DTI can involve ischemia, ischemia/reperfusion injury, impaired lymphatic drainage, and sustained tissue deformation. Recently, we have provided evidence that in a controlled animal model, deformation is the main trigger for damage within a 2h loading period [1,2]. However, ischemia and reperfusion may play a more important role in the damage process during prolonged loading periods.

scholarly journals Laminarin Attenuates Ultraviolet-Induced Skin Damage by Reducing Superoxide Anion Levels and Increasing Endogenous Antioxidants in the Dorsal Skin of Mice

Marine Drugs ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 345 ◽  
Author(s):  
Ji Hyeon Ahn ◽  
Dae Won Kim ◽  
Cheol Woo Park ◽  
Bora Kim ◽  
Hyejin Sim ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Superoxide Anion ◽  
Collagen Fibers ◽  
Ultraviolet B ◽  
Control Group ◽  
Dorsal Skin ◽  
Skin Damage ◽  
Superoxide Anion Production ◽  
Uvb Exposure ◽  
Immunohistochemical Studies

A number of studies have demonstrated that marine carbohydrates display anti-oxidant, anti-melanogenic, and anti-aging activities in the skin. Laminarin (LA), a low-molecular-weight polysaccharide, is found in brown algae. The benefits of LA in ultraviolet B (UVB) induced photodamage of the skin have not been reported. The aim of this study was to investigate the effects of pre-treated LA on histopathological changes and oxidative damage in mouse dorsal skin on day 5, following repeated UVB exposure. Histopathology, Western blot analysis and immunohistochemical studies showed that epidermal thickness in the UVB group was significantly increased; however, the thickness in the UVB group treated with LA (LA/UVB group) was less compared with that of the UVB group. Collagen fibers in the dermis of the UVB group were significantly decreased and destroyed, whereas, in the LA/UVB group, the density of collagen fibers was significantly increased compared with that of the UVB group. Oxidative stress due to superoxide anion production measured via dihydroethidium fluorescence staining was dramatically increased in the UVB group, whereas in the LA/UVB group, the oxidative stress was significantly decreased. Expressions of SOD1, glutathione peroxidase and catalase were markedly reduced in the UVB group, whereas in the LA/UVB group, they were significantly higher along with SOD2 than in the control group. Taken together, our results indicate that LA pretreatment prevents or attenuates skin damage, by decreasing oxidative stress and increasing antioxidant enzymes in mouse dorsal skin.

scholarly journals Protective Effects of Dietary Grape on UVB-Mediated Cutaneous Damages and Skin Tumorigenesis in SKH-1 Mice

Cancers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1751 ◽  
Author(s):  
Charlotte A. Mintie ◽  
Anna K. Musarra ◽  
Chandra K. Singh ◽  
Mary A. Ndiaye ◽  
Ruth Sullivan ◽  
...  
Keyword(s):  
Mast Cell ◽  
Early Stage ◽  
Cell Infiltration ◽  
Protective Effects ◽  
Skin Damage ◽  
Short Term ◽  
Skin Tumorigenesis ◽  
Upstream Regulator ◽  
Short Term Study ◽  
Uvb Exposure

Non-melanoma skin cancers (NMSCs) are the most diagnosed cancers in the US and occur more frequently in males. We previously demonstrated chemoprotective effects of dietary grape powder (GP) against UVB-mediated skin tumorigenesis in female SKH-1 mice. To expand on this, here, we determined the effects of GP in a short-term UVB exposure protocol (0 or 5% GP, followed by UVB every other day for 2 weeks) in male and female SKH-1 mice, as well as explored any sex-related differences in UVB carcinogenesis via male SKH-1 mice (0, 3, or 5% GP; UVB twice weekly for 28 weeks). In the short-term study, we found that GP protects against early-stage epithelial hyperplasia and mast cell infiltration in both sexes. In the long term, GP markedly reduced tumor counts and malignant conversion, along with significant decreases in mast cell infiltration, serum IgE and Eotaxin. We also found inhibition of P38 phosphorylation and reduced PCNA, Ki67 and BCL2 levels, suggesting that the anti-inflammatory effects of GP inhibits P38, acting as an upstream regulator to inhibit proliferation and reduce tumor cell survival. Together, GP appears to protect against UVB-mediated skin damage and carcinogenesis in SKH-1 mice and should be explored further as a supplement for NMSC prevention.

scholarly journals Antiphotoaging Effect of 3,5-Dicaffeoyl-epi-quinic Acid against UVA-Induced Skin Damage by Protecting Human Dermal Fibroblasts In Vitro

2020 ◽  
Vol 21 (20) ◽  
pp. 7756
Author(s):  
Jung Hwan Oh ◽  
Fatih Karadeniz ◽  
Chang-Suk Kong ◽  
Youngwan Seo
Keyword(s):  
Molecular Mechanisms ◽  
Type I Collagen ◽  
Nuclear Translocation ◽  
Quinic Acid ◽  
Dermal Fibroblasts ◽  
Type I ◽  
Human Dermal Fibroblasts ◽  
Skin Damage ◽  
Chronological Aging

Cutaneous aging is divided into intrinsic and exogenous aging correspondingly contributing to the complex biological phenomenon in skin. Intrinsic aging is also termed chronological aging, which is the accumulation of inevitable changes over time and is largely genetically determined. Superimposed on this intrinsic process, exogenous aging is associated with environmental exposure, mainly to ultraviolet (UV) radiation and more commonly termed as photoaging. UV-induced skin aging induces increased expression of matrix metalloproteinases (MMPs) which in turn causes the collagen degradation. Therefore, MMP inhibitors of natural origin are regarded as a primary approach to prevent or treat photoaging. This study investigated the effects of 3,5-dicaffeoyl-epi-quinic acid (DEQA) on photoaging and elucidated its molecular mechanisms in UVA-irradiated human dermal fibroblasts (HDFs). The results show that treatment with DEQA decreases MMP-1 production and increases type I collagen production in UVA-damaged HDFs. In addition, treatment of UVA-irradiated HDFs with DEQA downregulates MMP-1, MMP-3 and MMP-9 expression via blocking MAPK-cascade-regulated AP-1 transcriptional activity in UVA-irradiated HDFs. Furthermore, DEQA relieves the UVA-mediated suppression of type I procollagen and collagen expression through stimulating TGF-β/Smad signaling, leading to activation of the Smad 2/3 and Smad 4 nuclear translocation. These results suggest that DEQA could be a potential cosmetic agent for prevention and treatment of skin photoaging.

Crosstalk between the CX3CL1/CX3CR1 Axis and Inflammatory Signaling Pathways in Tissue Injury

2019 ◽  
Vol 20 (8) ◽  
pp. 844-854 ◽  
Author(s):  
Quan Zhuang ◽  
Jiarui Ou ◽  
Sheng Zhang ◽  
Yingzi Ming
Keyword(s):  
Signaling Pathways ◽  
Tissue Injury ◽  
Signaling Networks ◽  
Toll Like Receptor ◽  
Inflammatory Signaling ◽  
Inflammatory Cascade ◽  
Inflammatory Processes ◽  
Membrane Bound ◽  
G Protein Coupled ◽  
Receptor Cx3cr1

During inflammation, chemokines play a central role by mediating the activation of inflammatory cascade responses in tissue injury. Among more than 200 chemokines, CX3CL1 is a special chemotactic factor existing in both membrane-bound and soluble forms. Its only receptor, CX3CR1, is a member of the G protein-coupled receptor superfamily. The CX3CL1/CX3CR1 axis can affect many inflammatory processes by communicating with different inflammatory signaling pathways, such as JAK-STAT, Toll-like receptor, MAPK, AKT, NF-κB, Wnt/β-catenin, as well as others. These inflammatory networks are involved in much pathology. Determining the crosstalk between the CX3CL1/CX3CR1 axis and these inflammatory signaling pathways could contribute to solving problems in tissue injury, and the CX3CL1/CX3CR1 axis may be a better therapeutic target than inflammatory signaling pathways for preventing tissue injury due to the complexity of inflammatory signaling networks.

scholarly journals Metabolic characterization of menopause: cross-sectional and longitudinal evidence

2017 ◽  
Author(s):  
Qin Wang ◽  
Diana L Santos Ferreira ◽  
Scott M Nelson ◽  
Naveed Sattar ◽  
Mika Ala-Korpela ◽  
...  
Keyword(s):  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Metabolic Changes ◽  
Reproductive Status ◽  
Cross Sectional ◽  
Chronological Aging ◽  
Reactive Protein ◽  
Age Related ◽  
Post Menopausal ◽  
Metabolic Biomarkers

AbstractBackgroundIt remains elusive whether the changes in cardiometabolic biomarkers during the menopausal transition are due to ovarian aging or chronological aging. Well-conducted longitudinal studies are required to determine this. The aim of this study was to explore the cross-sectional and longitudinal associations of reproductive status defined according to the 2012 Stages of Reproductive Aging Workshop criteria with 74 metabolic biomarkers, and establish whether any associations are independent of age related changes.MethodsWe determined cross-sectional associations of reproductive status with metabolic profiling in 3,312 UK midlife women. In a subgroup of 1,492 women who had repeat assessments after 2.5 years, we assessed how change in reproductive status was associated with the changes in metabolic biomarkers. Metabolic profiles were measured by high-throughput quantitative serum NMR metabolomics. In longitudinal analyses, we compared the change in metabolic biomarkers for each reproductive status category change to that in the reference of being pre-menopausal at both time points. As all women aged by a similar amount during follow-up, these analyses contribute to distinguish age related changes from those related to change in reproductive status.ResultsConsistent cross-sectional and longitudinal associations of menopause with a wide range of metabolic biomarkers were observed, suggesting transition to menopause induces multiple metabolic changes independent of chronological aging. The metabolic changes included increased concentrations of very small VLDL, IDL and LDL subclasses, remnant and LDL cholesterol, and reduced LDL particle size, all towards an atherogenic lipoprotein profile. Increased inflammation was suggested via an inflammatory biomarker, glycoprotein acetyls, but not via C-reactive protein. Also, levels of glutamine and albumin were increased during the transition. Most of these metabolic changes seen at the time of becoming post-menopausal remained or became slightly stronger during the post-menopausal years.ConclusionsTransition to post-menopause has effects on multiple circulating metabolic biomarkers, over and above the underlying age trajectory. The adverse changes in multiple apolipoprotein-B containing lipoprotein subclasses and increased inflammation may underlie women’s increased cardiometabolic risk in post-menopausal years.AbbreviationsALSPACAvon Longitudinal Study of Parents and ChildrenBMIbody mass indexCRPhigh sensitive C-reactive proteinCVDcardiovascular diseasesHDLhigh-density lipoproteinHRThormone replacement therapyIDLintermediate-density lipoproteinLDLlow-density lipoproteinSDstandard deviationSTRAWStages of Reproductive Aging WorkshopSWANThe Study of Women’s health Across the NationVLDLvery low-density lipoprotein

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