Mechanisms of ageing and development

Publisher: Elsevier

Description

  • Impact factor
    4.18
  • 5-year impact
    3.91
  • Cited half-life
    6.70
  • Immediacy index
    0.63
  • Eigenfactor
    0.02
  • Article influence
    1.36
  • ISSN
    1872-6216

Publisher details

Elsevier

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    • Publisher's version/PDF cannot be used
    • Articles in some journals can be made Open Access on payment of additional charge
    • NIH Authors articles will be submitted to PubMed Central after 12 months
    • Publisher last contacted on 18/10/2013
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: p53 and NF-κB are key transcription factors in regulating the gene expression program of cellular and organismal senescence. PPM1B is a member of the protein phosphatase 2 C family and plays a role in negatively regulating p53 and NF-κB thereby possibly attenuating the gene expression program of cellular senescence. Here, possible involvement of PPM1B in replicative senescence has been investigated using the in vitro aging model of IMR-90 cells. PPM1B protein levels are progressively decreased in a replicative age-dependent manner. Importantly, PPM1B depletion induces a robust senescence phenotype as evidenced by significant growth arrest and senescence marker expression. Given that PPM1B depletion-induced senescence is partially rescued by inactivating p38 MAPK, our results identify PPM1B as a critical regulator of both p38 MAPK-dependent and -independent senescence pathways during normal cellular aging process.
    Mechanisms of ageing and development 06/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Does aging in itself lead to alteration in adrenocortical mitochondrial oxidative phosphorylation? Mitochondria from Fischer 344 (F344) rats (6 and 24 months old), Brown Norway rats (6 and 32 months old) and F344-Brown Norway hybrid rats (6 and 30 months old) were compared. Mitochondria were isolated from extirpated adrenal cortex. The yields of mitochondria were quantitatively similar in all rat strains irrespective of age. In order to assess the activity of each mitochondrial complex, several different substrates were tested and the rate of oxidative phosphorylation measured. Aging does not affect mitochondrial activity except in the F344 rat adrenal cortex where the maximal ADP-stimulated oxidative phosphorylation decreased with age. We hypothesize that impaired synthesis of steroid hormones by the adrenal cortex with age in F344 rats might be due to decreased adrenocortical mitochondrial oxidative phosphorylation. We conclude that aging results in adrenocortical mitochondria effects that are non-uniform across different rat strains.
    Mechanisms of ageing and development 01/2014;
  • Article: PREFACE.
    Mechanisms of ageing and development 01/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Increasing age involves a number of detrimental changes in the cardiovascular system and particularly on the large arteries. It deteriorates vascular integrity and leads to increased vascular stiffness entailing hypertension with increased cardiovascular morbidity and mortality. The consequences of continuous oxidative stress and damages to biomolecules include altered gene expression, genomic instability, mutations, loss of cell division and cellular responses to increased stress. Many studies have been performed in aged C57BL/6 mice; however, analyses of the age-related changes that occur at a gene expression level and transcriptional profile in vascular tissue have not been elucidated in depth. To determine the changes of the vascular transcriptome, we conducted gene expression microarray experiments on aortas of adult and old mice, in which age-related vascular dysfunction was confirmed by increased stiffness and associated systolic hypertension. Our results highlight differentially expressed genes overrepresented in Gene Ontology categories. Molecular interaction and reaction pathways involved in vascular functions and disease, within the transforming growth factor-beta (TGF-β) pathway, the renin-angiotensin system and the detoxification systems are displayed. Our results provide insight to an altered gene-expression profile related to age, thus offering useful clues to counteract or prevent vascular aging and its detrimental consequences.
    Mechanisms of ageing and development 01/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Cockayne Syndrome is a segmental premature aging syndrome, which can be caused by loss of function of the CSB protein. CSB is essential for genome maintenance and has numerous interaction partners with established roles in different DNA repair pathways including transcription coupled nucleotide excision repair and base excision repair. Here, we describe a new interaction partner for CSB, the DNA glycosylase NEIL2. Using both cell extracts and recombinant proteins, CSB and NEIL2 was found to physically interact independently of DNA. We further found that CSB is able to stimulate NEIL2 glycosylase activity on a 5-hydroxyl uracil lesion in a DNA bubble structure substrate in vitro. A novel 4,6-diamino-5-formamidopyrimidine (FapyA) specific incision activity of NEIL2 was also stimulated by CSB. To further elucidate the biological role of the interaction, immunofluorescence studies were performed, showing an increase in cytoplasmic CSB and NEIL2 co-localization after oxidative stress. Additionally, stalling of the progression of the transcription bubble with α-amanitin resulted in increased co-localization of CSB and NEIL2. Finally, CSB knockdown resulted in reduced incision of 8-hydroxyguanine in a DNA bubble structure using whole cell extracts. Taken together, our data supports a biological role for CSB and NEIL2 in transcription associated base excision repair.
    Mechanisms of ageing and development 01/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Ageing is characterized by immunosenescence and the progressive decline in immunity in association with an increased frequency of infections and chronic disease. This complex process affects both the innate and adaptive immune systems with a progressive decline in most immune cell populations and defects in activation resulting in loss of function. Although host genetics and environmental factors, such as stress, exercise and diet can impact on the onset or course of immunosenescence, the mechanisms involved are largely unknown. This review focusses on identifying the most significant aspects of immunosenescence and on the evidence that nutritional intervention might delay this process, and consequently improve the quality of life of the elderly.
    Mechanisms of ageing and development 12/2013;