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https://www.readbyqxmd.com/read/30118525/tlr4-mediated-activation-of-the-erk-pathway-following-uva-irradiation-contributes-to-increased-cytokine-and-mmp-expression-in-senescent-human-dermal-fibroblasts
#1
Seong-Wook Seo, Seul-Ki Park, Soo-Jin Oh, Ok Sarah Shin
Exposure to ultraviolet (UV) radiation is a major contributing factor to premature aging (photoaging) and skin cancer. In vitro models of cellular senescence have proven to be very useful for the study of slow and progressive accumulation of damage resulting in the growth arrest of aging skin cells. In this study, we compared UVA-induced cellular responses in non-senescent (NS) vs. senescent (S) human dermal fibroblasts (HDFs). HDFs were irradiated with a single dose of UVA (7.5 J/cm2) and QuantSeq 3' mRNA sequencing was performed to assess differential gene expression...
2018: PloS One
https://www.readbyqxmd.com/read/30109767/altered-modulation-of-lamin-a-c-hdac2-interaction-and-p21-expression-during-oxidative-stress-response-in-hgps
#2
Elisabetta Mattioli, Davide Andrenacci, Cecilia Garofalo, Sabino Prencipe, Katia Scotlandi, Daniel Remondini, Davide Gentilini, Anna Maria Di Blasio, Sergio Valente, Emanuela Scarano, Lucia Cicchilitti, Giulia Piaggio, Antonello Mai, Giovanna Lattanzi
Defects in stress response are main determinants of cellular senescence and organism aging. In fibroblasts from patients affected by Hutchinson-Gilford progeria, a severe LMNA-linked syndrome associated with bone resorption, cardiovascular disorders, and premature aging, we found altered modulation of CDKN1A, encoding p21, upon oxidative stress induction, and accumulation of senescence markers during stress recovery. In this context, we unraveled a dynamic interaction of lamin A/C with HDAC2, an histone deacetylase that regulates CDKN1A expression...
August 15, 2018: Aging Cell
https://www.readbyqxmd.com/read/30097108/hydroalcoholic-extract-of-spartium-junceum-l-flowers-inhibits-growth-and-melanogenesis-in-b16-f10-cells-by-inducing-senescence
#3
Valentina Nanni, Lorena Canuti, Angelo Gismondi, Antonella Canini
BACKGROUND: Ultraviolet light exposure generates, in human tissues, radical species, which represent the main cause of photo-aging, DNA damage and skin cancer onset. On the other hand, Mediterranean plants, being continuously subjected to high solar radiation levels, are naturally adapted to take on this type of abiotic stress, thanks to the production of antioxidant secondary metabolites. For these reasons, several plant extracts were documented to be excellent antineoplastic drugs. PURPOSE: We investigated the potential antitumor activity of the flower extract obtained by Spartium junceum L...
July 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/30092820/adipose-tissue-derived-extracellular-fraction-characterization-biological-and-clinical-considerations-in-regenerative-medicine
#4
Barbara Bellei, Emilia Migliano, Marinella Tedesco, Silvia Caputo, Federica Papaccio, Gianluca Lopez, Mauro Picardo
BACKGROUND: Adipose tissue-derived stem cells are considered to be a promising source in the field of cell therapy and regenerative medicine. In addition to direct cell replacement using adipose tissue or purified stem cells, intercellular molecule exchange by the adipose tissue complex, a vast array of bioactive secretory factors, demonstrated beneficial effects by reducing tissue damage and stimulation of endogenous repair. However, for therapeutic purposes, the use of secretome derivatives, such as full conditioned media or purified exosomes generated in vitro, may present considerable disadvantages for cell manufacturing, storage, product safety, and their potential as a ready-to-go therapeutic product...
August 9, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/30088035/stim1-deficiency-is-linked-to-alzheimer-s-disease-and-triggers-cell-death-in-sh-sy5y-cells-by-upregulation-of-l-type-voltage-operated-ca-2-entry
#5
Carlos Pascual-Caro, Maria Berrocal, Aida M Lopez-Guerrero, Alberto Alvarez-Barrientos, Eulalia Pozo-Guisado, Carlos Gutierrez-Merino, Ana M Mata, Francisco Javier Martin-Romero
STIM1 is an endoplasmic reticulum protein with a role in Ca2+ mobilization and signaling. As a sensor of intraluminal Ca2+ levels, STIM1 modulates plasma membrane Ca2+ channels to regulate Ca2+ entry. In neuroblastoma SH-SY5Y cells and in familial Alzheimer's disease patient skin fibroblasts, STIM1 is cleaved at the transmembrane domain by the presenilin-1-associated γ-secretase, leading to dysregulation of Ca2+ homeostasis. In this report, we investigated expression levels of STIM1 in brain tissues (medium frontal gyrus) of pathologically confirmed Alzheimer's disease patients, and observed that STIM1 protein expression level decreased with the progression of neurodegeneration...
August 7, 2018: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/30062376/herpes-zoster-vaccine-a-protection-for-the-elderly
#6
A Di Pietro, A Facciolà, G Visalli
The Herpes Zoster vaccine is strongly recommended by the World Health Organization to promote healthy aging by preventing the corresponding age- related disease, also named shingles. The disease is due to the endogenous reactivation of Varicella Zoster Virus, the causal agent of chickenpox, that becomes latent at the peripheral nervous system level. Here, owing to the host's cell-mediated immunity, it may be confined for several decades. However, the immune senescence allows the possibility of virus reactivation, causing the onset of neuropathic pain and skin rash that characterize the acute disease...
July 2018: Annali di Igiene: Medicina Preventiva e di Comunità
https://www.readbyqxmd.com/read/30026686/an-overview-of-the-role-of-lipofuscin-in-age-related-neurodegeneration
#7
REVIEW
Alexandra Moreno-García, Alejandra Kun, Olga Calero, Miguel Medina, Miguel Calero
Despite aging being by far the greatest risk factor for highly prevalent neurodegenerative disorders, the molecular underpinnings of age-related brain changes are still not well understood, particularly the transition from normal healthy brain aging to neuropathological aging. Aging is an extremely complex, multifactorial process involving the simultaneous interplay of several processes operating at many levels of the functional organization. The buildup of potentially toxic protein aggregates and their spreading through various brain regions has been identified as a major contributor to these pathologies...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/30016760/assessing-off-target-cytotoxicity-of-the-field-lampricide-3-trifluoromethyl-4-nitrophenol-using-novel-lake-sturgeon-cell-lines
#8
Nguyen T K Vo, Levi C Moore, Katelin W Spiteri, Robert Hanner, Michael P Wilkie, Stephanie J DeWitte-Orr
Lampricides are currently being applied to streams and rivers to control the population of sea lamprey, an invasive species, in the Great Lakes. The most commonly used lampricide agent used in the field is 3-trifluoromethyl-4-nitrophenol (TFM), which targets larval sea lamprey in lamprey-infested rivers and streams. The specificity of TFM is due to the relative inability of sea lamprey to detoxify the agent relative to non-target fishes. There is increasing concern, however, about non-target effects on fishes, particularly threatened populations of juvenile lake sturgeon (LS; Acipenser fulvescens)...
October 30, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30016619/nrf2-mediated-fibroblast-reprogramming-drives-cellular-senescence-by-targeting-the-matrisome
#9
Paul Hiebert, Mateusz S Wietecha, Michael Cangkrama, Eric Haertel, Eleni Mavrogonatou, Michael Stumpe, Heiko Steenbock, Serena Grossi, Hans-Dietmar Beer, Peter Angel, Jürgen Brinckmann, Dimitris Kletsas, Jörn Dengjel, Sabine Werner
Nrf2 is a key regulator of the antioxidant defense system, and pharmacological Nrf2 activation is a promising strategy for cancer prevention and promotion of tissue repair. Here we show, however, that activation of Nrf2 in fibroblasts induces cellular senescence. Using a combination of transcriptomics, matrix proteomics, chromatin immunoprecipitation and bioinformatics we demonstrate that fibroblasts with activated Nrf2 deposit a senescence-promoting matrix, with plasminogen activator inhibitor-1 being a key inducer of the senescence program...
July 16, 2018: Developmental Cell
https://www.readbyqxmd.com/read/30010732/effect-of-color-and-contrast-of-highbush-blueberries-to-host-finding-behavior-by-drosophila-suzukii-diptera-drosophilidae
#10
Catherine M Little, Thomas W Chapman, N Kirk Hillier
Drosophila suzukii Matsumara (Diptera: Drosophilidae) has become a serious pest in soft-skin fruits and berries, infesting both ripe and ripening fruits. Crop damage in highbush blueberry has been particularly severe. During blueberry fruit development, fruits of various degrees of ripeness are present simultaneously. In addition, foliage color changes as the season progresses. We investigated the influence of blueberry fruit and leaf color on host-finding behavior in D. suzukii. Opposing shifts between reflectance spectra of ripening fruits and senescing leaves increased contrast between ripe fruit and senesced foliage...
July 14, 2018: Environmental Entomology
https://www.readbyqxmd.com/read/30009828/cockayne-syndrome-type-a-csa-protein-protects-primary-human-keratinocytes-from-senescence
#11
Sonia Cordisco, Lavinia Tinaburri, Massimo Teson, Donata Orioli, Romilda Cardin, Paolo Degan, Miria Stefanini, Giovanna Zambruno, Liliana Guerra, Elena Dellambra
Defects in Cockayne syndrome type A (CSA), a gene involved in nucleotide excision repair, cause an autosomal recessive syndrome characterized by growth failure, progressive neurological dysfunction, premature aging, and skin photosensitivity and atrophy. Beyond its role in DNA repair, the CSA protein has additional functions in transcription and oxidative stress response, which are not yet fully elucidated. Here, we investigated the role of CSA protein in primary human keratinocyte senescence. Primary keratinocytes from three CS-A patients displayed premature aging features, namely premature clonal conversion, high steady-state levels of ROS and 8-OH-hydroxyguanine (8-OH-Gua) and senescence-associated secretory phenotype (SASP)...
July 12, 2018: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29988591/more-than-skin-deep-autophagy-is-vital-for-skin-barrier-function
#12
REVIEW
Payel Sil, Sing-Wai Wong, Jennifer Martinez
The skin is a highly organized first line of defense that stretches up to 1.8 m2 and is home to more than a million commensal bacteria. The microenvironment of skin is driven by factors such as pH, temperature, moisture, sebum level, oxidative stress, diet, resident immune cells, and infectious exposure. The skin has a high turnover of cells as it continually bares itself to environmental stresses. Notwithstanding these limitations, it has devised strategies to adapt as a nutrient-scarce site. To perform its protective function efficiently, it relies on mechanisms to continuously remove dead cells without alarming the immune system, actively purging the dying/senescent cells by immunotolerant efferocytosis...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29970227/variability-of-facial-movements-in-relation-to-sexual-dimorphism-and-age-three-dimensional-geometric-morphometric-study
#13
J Velemínská, S Danková, M Břízová, L Červenková, V Krajíček
The aim of this study was to introduce suitable imaging technique and analytical methods for a detailed description of the facial movements in relation to sexual dimorphism and age in adult individuals. Removing of size factor from the analysis, we hypothesised that there will be no significant intersexual difference in facial mobility. We assume facial movements to be more pronounced in the older age category due to increasing the facial surface. We have compared five facial movements - raising eyebrows, closing eyes, pursing of the lips, inflating of the cheeks and smile - in relation to neutral expression of the human face...
May 2018: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/29964182/long-term-administration-of-pdc-stimulative-lactic-acid-bacteria-lactococcus-lactis-strain-plasma-prevents-immune-senescence-and-decelerates-individual-senescence
#14
Ryohei Tsuji, Yuta Komano, Konomi Ohshio, Naoaki Ishii, Osamu Kanauchi
Aging is accompanied by the decline in immune function, resulting in increasing susceptibility to infectious diseases and tumorigenesis. In our previous reports, we showed that Lactococcus lactis subsp. lactis strain Plasma (LC-Plasma) stimulated plasmacytoid dendritic cells (pDCs), which play an important role in viral infection, and oral administration of LC-Plasma showed prophylactic effects against viral infection both in mice and humans. However, the effects of long-term administration of LC-Plasma are not known...
June 30, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29961188/anti-inflammatory-activities-of-ophiopogonis-radix-on-hydrogen-peroxide-induced-cellular-senescence-of-normal-human-dermal-fibroblasts
#15
Yumi Kitahiro, Atsushi Koike, Aska Sonoki, Mei Muto, Kazuo Ozaki, Makio Shibano
Ophiopogonis Radix (Ophiopogon root), which nourishes the yin, has been used in clinical practice to promote fluid secretion and to moisturize the lungs and skin in traditional Chinese and Japanese (Kampo) medicine. To evaluate this traditional medicinal effect, we investigated the anti-chronic inflammatory effect of Radix Ophiopogonis on senescent cells. Conversely, although several phenotypes of Ophiopogon japonicus Ker-Gawler (Liliaceae) are prevalent in Japan and China, we used these Ophiopogon roots by considering them as one crude drug, Ophiopogonis Radix...
June 30, 2018: Journal of Natural Medicines
https://www.readbyqxmd.com/read/29959907/pyruvate-protects-against-cellular-senescence-through-the-control-of-mitochondrial-and-lysosomal-function-in-dermal-fibroblasts
#16
Jeong Yeon Kim, Sung Hoon Lee, Il-Hong Bae, Dong Wook Shin, Daejin Min, Mira Ham, Kyu-Han Kim, Tae Ryong Lee, Hyoung-June Kim, Eui Dong Son, Ai-Yong Lee, Yeong Wook Song, In Sup Kil
Mitochondrial dysfunction can drive cellular senescence, which is accompanied by changes in metabolism and increases in senescence-associated secretory phenotypes (SASP). Although pyruvate, a key metabolite for numerous aspects of metabolism, has been used as general supplement in synthetic media, the physiological function of pyruvate underlying its protective role against cellular senescence under normal conditions has remained unknown. Here, we show that extracellular pyruvate prevents senescence in normal human dermal fibroblasts (NHDFs) through increasing the generation of NAD+ during the conversion to lactate...
June 27, 2018: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29901204/protective-effect-of-crocin-on-ultraviolet-b%C3%A2-induced-dermal-fibroblast-photoaging
#17
Mingwu Deng, Dong Li, Yichen Zhang, Guangdong Zhou, Wei Liu, Yilin Cao, Wenjie Zhang
Ultraviolet B (UVB) radiation induces the production of reactive oxygen species (ROS), resulting in the aging of dermal fibroblasts. Crocin, a bioactive constituent of Crocus sativus, possesses anti‑oxidation effects. The purpose of the present study was to evaluate the protective effect of crocin on UVB‑induced dermal fibroblast photoaging. Human dermal fibroblasts were isolated and cultured with different concentrations of crocin prior to and following exposure to UVB irradiation. The senescent phenotypes of cells were evaluated, including cell proliferation, cell cycle, senescence‑associated β‑galactosidase (SA‑β‑gal) expression, intracellular ROS, expression of antioxidant protein glutathione peroxidase 1 (GPX‑1) and extracellular matrix protein collagen type 1 (Col‑1)...
August 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29890746/exosomes-derived-from-human-induced-pluripotent-stem-cells-ameliorate-the-aging-of-skin-fibroblasts
#18
Myeongsik Oh, Jinhee Lee, Yu Jin Kim, Won Jong Rhee, Ju Hyun Park
Stem cells and their paracrine factors have emerged as a resource for regenerative medicine. Many studies have shown the beneficial effects of paracrine factors secreted from adult stem cells, such as exosomes, on skin aging. However, to date, few reports have demonstrated the use of exosomes derived from human pluripotent stem cells for the treatment of skin aging. In this study, we collected exosomes from the conditioned medium of human induced pluripotent stem cells (iPSCs) and investigated the effect on aged human dermal fibroblasts (HDFs)...
June 9, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29846953/exploring-pathways-for-sustained-melanogenesis-in-facial-melasma-an-immunofluorescence-study
#19
A C C Espósito, G Brianezi, N P de Souza, L D B Miot, M E A Marques, H A Miot
BACKGROUND: The physiopathology of epidermal hypermelanization in melasma is not completely understood. Several cytokines and growth factors are increased in skin with melasma, nevertheless, nor the pathways involved in the increased αMSH expression have been adequately evaluated, nor a model for sustained focal melanogenesis is available. OBJECTIVE: To explore stimulatory pathways for epidermal pigmentation in facial melasma related to αMSH: those linked to ultraviolet radiation, oxidative stress, inflammation, neural crest pigmentation cell differentiation and antagonism of αMSH...
May 30, 2018: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/29804261/qualitatively-monitoring-binding-and-expression-of-the-transcription-factors-sp1-and-nfi-as-a-useful-tool-to-evaluate-the-quality-of-primary-cultured-epithelial-stem-cells-in-tissue-reconstruction
#20
Gaëtan Le-Bel, Sergio Cortez Ghio, Danielle Larouche, Lucie Germain, Sylvain L Guérin
Electrophoretic mobility shift assays and Western blots are simple, efficient, and rapid methods to study DNA-protein interactions and protein expression, respectively. Primary cultures and subcultures of epithelial cells are widely used for the production of tissue-engineered substitutes and are gaining popularity as a model for gene expression studies. The preservation of stem cells through the culture process is essential to produce high quality substitutes. However, the increase in the number of cell passages is associated with a decrease in their ability to proliferate until senescence is reached...
May 27, 2018: Methods in Molecular Biology
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