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https://www.readbyqxmd.com/read/28738418/molecular-pathway-to-protection-from-age-dependent-photoreceptor-degeneration-in-mef2-deficiency
#1
Saumya Nagar, Dorit Trudler, Scott R McKercher, Juan Piña-Crespo, Nobuki Nakanishi, Shu-Ichi Okamoto, Stuart A Lipton
Purpose: Photoreceptor degeneration in the retina is a major cause of blindness in humans. Elucidating mechanisms of degenerative and neuroprotective pathways in photoreceptors should afford identification and development of therapeutic strategies. Methods: We used mouse genetic models and improved methods for retinal explant cultures. Retinas were enucleated from Mef2d+/+ and Mef2d-/- mice, stained for MEF2 proteins and outer nuclear layer thickness, and assayed for apoptotic cells...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738367/extensive-amplification-of-telomeric-repeats-in-the-karyotypically-highly-diverse-african-pygmy-mice
#2
Victor Colomina, Josette Catalan, Janice Britton-Davidian, Frédéric Veyrunes
Telomeres are ribonucleoprotein structures protecting the physical ends of eukaryotic chromosomes. However, telomeric sequences can also occur at non-terminal regions of chromosomes, forming the so-called interstitial telomeric sequences (ITSs). Some ITSs are considered as relics of past chromosomal rearrangements and as such provide important insights into karyotype evolution. By FISH, we explored the distribution of telomeric motifs in the genome of a complex of mammalian species that has long been recognized for its extraordinary karyotypic diversity: the African pygmy mice...
July 22, 2017: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/28737707/an-appropriate-modulation-of-lymphoproliferative-response-and-cytokine-release-as-possible-contributors-to-longevity
#3
Irene Martínez de Toda, Carmen Vida, Mónica De la Fuente
The decrease in the proliferative response of lymphocytes is one of the most evident among the age-related changes of the immune system. This has been linked to a higher risk of mortality in both humans and experimental animals. However, long-lived individuals, in spite of optimally maintaining most of the functions of the immune system, also seem to show an impaired proliferative response. Thus, it was hypothesized that these individuals may have distinct evolution times in this proliferation and a different modulatory capacity through their cytokine release profiles...
July 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28737214/decline-in-cellular-function-of-aged-mouse-c-kit-cardiac-progenitor-cells
#4
Alessandra Castaldi, Ramsinh Mansinh Dodia, Amabel M Orogo, Cristina M Zambrano, Rita H Najor, Åsa B Gustafsson, Joan Heller Brown, Nicole H Purcell
Therapeutic use of c-kit(+) cardiac progenitor cells (CPCs) is being evaluated for regenerative therapy in older patients with ischemic heart failure. Our understanding of the biology of these CPCs has however, largely come from studies of young cells and animal models. In the present study we examined characteristics of CPCs isolated from young (3 months) and aged (24 month) mice that could underlie the diverse outcomes reported for CPC-based therapeutics. We observed morphological differences and altered senescence indicated by increased senescence associated markers β-galactosidase and p16 mRNA in aged CPCs...
July 24, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28736900/depletion-of-pax7-satellite-cells-does-not-affect-diaphragm-adaptations-to-running-in-young-or-aged-mice
#5
Kevin A Murach, Amy L Confides, Angel Ho, Janna R Jackson, Lina S Ghazala, Charlotte A Peterson, Esther E Dupont-Versteegden
Satellite cell contribution to un-stressed diaphragm is higher compared to hind limb muscles, which is likely attributable to constant activation of this muscle to drive ventilation. Whether satellite cell depletion negatively impacts diaphragm quantitative and qualitative characteristics under stressed conditions in young and aged mice is unknown. We therefore challenged the diaphragm with prolonged running activity in the presence and absence of Pax7+ satellite cells in young and aged mice using an inducible Pax7(CreER) -R26R(DTA) model...
July 24, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28736738/preserving-and-restoring-bone-with-continuous-insulin-infusion-therapy-in-a-mouse-model-of-type-1-diabetes
#6
Jeffry S Nyman, Evangelia Kalaitzoglou, R Clay Bunn, Sasidhar Uppuganti, Kathryn M Thrailkill, John L Fowlkes
Those with type 1 diabetes (T1D) are more likely to suffer a fracture than age- and sex-matched individuals without diabetes, despite daily insulin therapy. In rodent studies examining the effect of bone- or glucose-targeting therapies on preventing the T1D-related decrease in bone strength, insulin co-therapy is often not included, despite the known importance of insulin signaling to bone mass accrual. Therefore, working toward a relevant pre-clinical model of diabetic bone disease, we assessed the effect of continuous subcutaneous insulin infusion (CSII) therapy at escalating doses on preserving bone and the effect of delayed CSII on rescuing the T1D-related bone deterioration in an established murine model of T1D...
December 2017: Bone Reports
https://www.readbyqxmd.com/read/28736440/repin1-deficiency-in-adipose-tissue-improves-whole-body-insulin-sensitivity-and-lipid-metabolism
#7
N Hesselbarth, A Kunath, M Kern, M Gericke, N Mejhert, M Rydén, M Stumvoll, M Blüher, N Klöting
BACKGROUND/OBJECTIVES: Replication initiator 1 (Repin1) gene encodes for a zinc-finger protein and has been implicated in the regulation of adipocyte cell size and glucose transport in vitro. Here, we investigate the consequences of reduced adipose tissue (AT) Repin1 expression in vivo. SUBJECTS/METHODS: We have inactivated the Repin1 gene in adipose tissue (iARep(-/-)) at an age of four weeks using tamoxifen-inducible gene targeting strategies on the background of C57BL/6NTac mice...
July 24, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28736036/-regulation-of-the-expression-of-coenzyme-q-synthesis-complex-during-ageing
#8
Carmen Campos-Silva, Iván Reyes-Torres, Maximiliano Rivera, Catherine Meza-Torres, Juan Diego Hernández-Camacho, Elisabet Rodríguez-Bies, Plácido Navas, Guillermo López-Lluch
INTRODUCTION: Coenzyme Q is an essential component in the activity of the mitochondrial electron transport chain. Its synthesis involves, at least, a complex of ten different proteins. In this study, an attempt is made to determine the evolution of the expression of the genes involved in coenzyme Q synthesis during mouse ageing. MATERIAL AND METHODS: The messenger RNA (mRNA) of different organs, such as brain, liver, kidney and skeletal muscle from young (8 months), mature (18 months), and old (24 months) mice was extracted by using Trizol and was then analysed by real time PCR (qPCR) using specific primers for all the known components of the coenzyme Q-synthesis complex (COQ genes)...
July 20, 2017: Revista Española de Geriatría y Gerontología
https://www.readbyqxmd.com/read/28735354/transplantation-sites-for-human-and-murine-islets
#9
Rebecca A Stokes, Kim Cheng, Amit Lalwani, Michael M Swarbrick, Helen E Thomas, Thomas Loudovaris, Tom W Kay, Wayne J Hawthorne, Philip J O'Connell, Jenny E Gunton
AIMS/HYPOTHESIS: Beta cell replacement is a potential cure for type 1 diabetes. In humans, islet transplants are currently infused into the liver via the portal vein, although this site has disadvantages. Here, we investigated alternative transplantation sites for human and murine islets in recipient mice, comparing the portal vein with quadriceps muscle and kidney, liver and spleen capsules. METHODS: Murine islets were isolated from C57BL6/J mice and transplanted into syngeneic recipients...
July 22, 2017: Diabetologia
https://www.readbyqxmd.com/read/28735146/influence-of-electromagnetic-pulse-on-the-offspring-sex-ratio-of-male-balb-c-mice
#10
Jin-Hui Li, Da-Peng Jiang, Ya-Feng Wang, Jia-Jia Yan, Qi-Yan Guo, Xia Miao, Hai-Yang Lang, Sheng-Long Xu, Jun-Ye Liu, Guo-Zhen Guo
Public concern is growing about the exposure to electromagnetic fields (EMF) and its effect on male reproductive health. Detrimental effect of EMF exposure on sex hormones, reproductive performance and sex-ratio was reported. The present study was designed to clarify whether paternal exposure to electromagnetic pulse (EMP) affects offspring sex ratio in mice. 50 male BALB/c mice aged 5-6 weeks were exposed to EMP daily for 2 weeks before mated with non-exposed females at 0d, 7d, 14d, 21d and 28d after exposure...
June 21, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28735143/transcranial-low-level-laser-therapy-improves-brain-mitochondrial-function-and-cognitive-impairment-in-d-galactose-induced-aging-mice
#11
Farzad Salehpour, Nahid Ahmadian, Seyed Hossein Rasta, Mehdi Farhoudi, Pouran Karimi, Saeed Sadigh-Eteghad
Mitochondrial function plays a key role in the aging-related cognitive impairment, and photoneuromodulation of mitochondria by transcranial low-level laser therapy (LLLT) may contribute to its improvement. This study focused on the transcranial LLLT effects on the D-galactose (DG)-induced mitochondrial dysfunction, apoptosis, and cognitive impairment in mice. For this purpose, red and near-infrared (NIR) laser wavelengths (660 and 810 nm) at 2 different fluencies (4 and 8 J/cm(2)) at 10-Hz pulsed wave mode were administrated transcranially 3 d/wk in DG-received (500 mg/kg/subcutaneous) mice model of aging for 6 weeks...
July 6, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28735021/wisp1-ccn4-aggravates-cartilage-degeneration-in-experimental-osteoarthritis
#12
Martijn H van den Bosch, Arjen B Blom, Vardit Kram, Azusa Maeda, Sheena Sikka, Yankel Gabet, Tina M Kilts, Wim B van den Berg, Peter L van Lent, Peter M van der Kraan, Marian F Young
OBJECTIVE: Increased Wisp1 expression was previously reported in experimental and human osteoarthritis. Moreover, adenoviral overexpression of Wisp1 in naïve mouse knee joints resulted in early OA-like cartilage lesions. Here, we determined how the matricellular protein WISP1 is involved in the pathology that occurs in the complex osteoarthritic environment with aging and experimental osteoarthritis in wild type and Wisp1(-/-) mice. METHODS: Wild type and Wisp1(-/-) mice were aged or experimental osteoarthritis was induced with intraarticular collagenase injection, destabilization of the medial meniscus or anterior cruciate ligament transection...
July 19, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28734877/enzymatic-and-free-radical-formation-of-cis-and-trans-epoxyeicosatrienoic-acids-in-vitro-and-in-vivo
#13
Theresa Aliwarga, Brianne S Raccor, Rozenn N Lemaitre, Nona Sotoodehnia, Sina A Gharib, Libin Xu, Rheem A Totah
Epoxyeicosatrienoic acids (EETs) are metabolites of arachidonic acid (AA) oxidation that have important cardioprotective and signaling properties. AA is an ω -6 polyunsaturated fatty acid (PUFA) that is prone to autoxidation. Although hydroperoxides and isoprostanes are major autoxidation products of AA, EETs are also formed from the largely overlooked peroxyl radical addition mechanism. While autoxidation yields both cis- and trans-EETs, cytochrome P450 (CYP) epoxygenases have been shown to exclusively catalyze the formation of all regioisomer cis-EETs, on each of the double bonds...
July 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28734203/exenatide-mitigated-diet-induced-vascular-aging-and-atherosclerotic-plaque-growth-in-apoe-deficient-mice-under-chronic-stress
#14
Guang Yang, Yanna Lei, Aiko Inoue, Limei Piao, Lina Hu, Haiying Jiang, Takeshi Sasaki, Hongxian Wu, Wenhu Xu, Chenglin Yu, Guangxian Zhao, Shinyu Ogasawara, Kenji Okumura, Masafumi Kuzuya, Xian-Wu Cheng
BACKGROUND AND AIMS: Exposure to psychosocial stress is a risk factor for cardiovascular disorders. Because the glucagon-like peptide-1 (GLP-1) receptor (GLP-1R) agonist prevents cardiovascular injury, we investigated the beneficial effects and mechanism of the GLP-1 analogue exenatide on stress-related vascular senescence and atherosclerosis in apolipoprotein E-deficient (ApoE(-/-)) mice fed a high-fat (HF) diet. METHODS: ApoE(-/-) mice fed the HF diet were assigned to non-stressed and immobilized-stress groups for 12 weeks...
July 13, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28733476/mir-30e-targets-glipr-2-to-modulate-diabetic-nephropathy-in-vitro-and-in-vivo-experiments
#15
Dong Zhao, Jinhua Jia, Hong Shao
The objectives of this study are to investigate the effect of miR-30e targeting GLIPR-2 on the pathological mechanism of DN. The renal tissues of db/db and db/m mice at different age of weeks were stained with PAS. qRT-PCR was applied to detect the expression of miR-30e and GLIPR-2, not only in the renal tissues of mice but also in the renal tubular epithelial cells (RTECs). By luciferase reporter gene assays, we found the 3'-UTR of the GLIPR-2 mRNA as a direct target of miR-30e. The RTECs cultured in high glucose were divided into blank control, NC, miR-30e mimics, miR-30e inhibitors, miR-30e inhibitor + si-GLIPR-2 and si-GLIPR-2 groups...
August 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/28732515/sexually-divergent-induction-of-microglial-associated-neuroinflammation-with-hippocampal-aging
#16
Colleen A Mangold, Benjamin Wronowski, Mei Du, Dustin R Masser, Niran Hadad, Georgina V Bixler, Robert M Brucklacher, Matthew M Ford, William E Sonntag, Willard M Freeman
BACKGROUND: The necessity of including both males and females in molecular neuroscience research is now well understood. However, there is relatively limited basic biological data on brain sex differences across the lifespan despite the differences in age-related neurological dysfunction and disease between males and females. METHODS: Whole genome gene expression of young (3 months), adult (12 months), and old (24 months) male and female C57BL6 mice hippocampus was analyzed...
July 21, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28732359/resveratrol-inhibits-age-dependent-spontaneous-tumorigenesis-by-sirt1-mediated-post-translational-modulations-in-the-annual-fish-nothobranchius-guentheri
#17
Tingting Liu, Long Ma, Zhaodi Zheng, Fenglin Li, Shan Liu, Yingbo Xie, Guorong Li
Resveratrol, SIRT1 activator, inhibits carcinogenesis predominantly performed in transgenic animal models, orthotopic cancers of nude mice or different cancer cell lines, but its effects during process of spontaneous tumors using vertebrate models remain untested. Spontaneous liver neoplasm is an age-related disease and is inhibited by resveratrol in the annual fish Nothobranchius guentheri, which indicates that the fish can act as an excellent model to study spontaneous tumorigenesis. Totally, 175 fish were fed with resveratrol and another 175 fish for controls...
July 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28732055/role-of-htra1-in-bone-formation-and-regeneration-in-vitro-and-in-vivo-evaluation
#18
Gladys Filliat, Ali Mirsaidi, André N Tiaden, Gisela A Kuhn, Franz E Weber, Chio Oka, Peter J Richards
The role of mammalian high temperature requirement protease A1 (HTRA1) in somatic stem cell differentiation and mineralized matrix formation remains controversial, having been demonstrated to impart either anti- or pro-osteogenic effects, depending on the in vitro cell model used. The aim of this study was therefore to further evaluate the role of HTRA1 in regulating the differentiation potential and lineage commitment of murine mesenchymal stem cells in vitro, and to assess its influence on bone structure and regeneration in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28731686/pyrethroid-insecticide-cypermethrin-accelerates-pubertal-onset-in-male-mice-via-disrupting-hypothalamic-pituitary-gonadal-axis
#19
Xiaoqing Ye, Feixue Li, Jianyun Zhang, Huihui Ma, Dapeng Ji, Xin Huang, Thomas E Curry, Weiping Liu, Jing Liu
Pyrethroids, a class of insecticides that are widely used worldwide, have been identified as endocrine-disrupting chemicals (EDCs). Our recent epidemiological study reported on an association of increased pyrethroids exposure with elevated gonadotropins levels and earlier pubertal development in Chinese boys. In this study, we further investigated the effects of cypermethrin (CP), one of the most ubiquitous pyrethroid insecticides, on hypothalamic-pituitary-gonadal (HPG) axis and pubertal onset in male animal models...
July 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28731407/t-cell-receptor-repertoires-of-mice-and-humans-are-clustered-in-similarity-networks-around-conserved-public-cdr3-sequences
#20
Asaf Madi, Asaf Poran, Eric Shifrut, Shlomit Reich-Zeliger, Erez Greenstein, Irena Zaretsky, Tomer Arnon, Francois Van Laethem, Alfred Singer, Jinghua Lu, Peter D Sun, Irun R Cohen, Nir Friedman
Diversity of T cell receptor (TCR) repertoires, generated by somatic DNA rearrangements, is central to immune system function. However, the level of sequence similarity of TCR repertoires within and between species has not been characterized. Using network analysis of high-throughput TCR sequencing data, we found that abundant CDR3-TCRβ sequences were clustered within networks generated by sequence similarity. We discovered a substantial number of public CDR3-TCRβ segments that were identical in mice and humans...
July 21, 2017: ELife
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