1. Heparan Sulfate Affects Elastin Deposition in Fibroblasts Cultured from Donors of Different AgesGiulia Annovi, Federica Boraldi, Pasquale Moscarelli, Deanna Guerra, Roberta Tiozzo, Bruna Parma, Pascal Sommer, Daniela Quaglino, 2012, izvirni znanstveni članek Opis: Heparan sulfate (HS), due to its presence on the cell surface and in the extracellular milieu and its ability to
modulate cell signaling, has a fundamental role in both physiological and pathological conditions. For decades
we have demonstrated the occurrence of interactions between glycosaminoglycans (GAGs) and elastic fibers. In
particular, we have recently shown that HS is present inside elastic fibers and plays a role in the assembly and
stability of elastin coacervates. Elastin represents, within the extracellular matrix, the component most severely
affected during aging, and changes in the synthesis and posttranslational modifications of HS have been described,
possibly influencing cellular behavior and protein interactions. Thus, the present study has investigated,
in two different in vitro experimental models, the role of HS on elastin deposition and assembly. Results
demonstrate that: (1) Biological effects of HS are partly dependent on the physicochemical characteristics of the
GAGs; (2) HS does not affect attachment, viability, and growth of human dermal fibroblasts; (3) HS does not
modify elastin gene expression nor elastin synthesis, but favors a-elastin aggregation and, independently from
the age of donors, elastin assembly; (4) HS significantly increases the expression of fibulin 5, and these effects are
especially evident in fibroblasts isolated from aging donors. These data provide a better understanding of the
biological role of HS and offer new perspectives regarding the possibility of restoring and/or preserving the
elastic component with aging.
Ključne besede: Heparan sulfate, Elastin, Fibroblasts
Objavljeno v RUNG: 23.08.2019; Ogledov: 3436; Prenosov: 0
Gradivo ima več datotek! Več... |
2. Comparison of ex vivo and in vitro human fibroblast ageing models.Federica Boraldi, Giulia Annovi, Roberta Tiozzo, Pascal Sommer, Daniela Quaglino, 2010, izvirni znanstveni članek Opis: Several studies have analyzed modulation of gene expression during physiological ageing with interesting, but often contradictory results, depending on the model used. In the present report we compare age-related metabolic and synthetic parameters in human dermal fibroblasts (HDF) isolated from young and old subjects (ex vivo ageing model) and cultured from early up to late cumulative population doublings (CPD) (in vitro ageing model) in order to distinguish changes induced in vivo by the aged environment and maintained in vitro, from those associated with cell senescence and progressive CPD. Results demonstrate that fibroblasts from aged donors, already at early CPD, exhibit an impaired redox balance, highlighting the importance of this parameter during ageing, even in the presence of standard environmental conditions, which are considered optimal for cell growth. By contrast, several proteins, as those related to heat shock response, or involved in endoplasmic reticulum and membrane trafficking, appeared differentially expressed only during in vitro ageing, suggesting that, at high CPD, the whole cell machinery becomes permanently altered. Finally, given the importance of the elastic component for a long-lasting connective tissue structural and functional compliance, this study focuses also on elastin and fibulin-5 synthesis and deposition, demonstrating a close relationship between fibulin-5 and ageing.
Ključne besede: Ageing
Fibroblast
Connective tissue
Oxidative stress
Protein expression
Elastin
Objavljeno v RUNG: 23.08.2019; Ogledov: 3848; Prenosov: 0
Gradivo ima več datotek! Več... |
3. Hypoxia influences the cellular cross-talk of human dermal fibroblasts. A proteomic approach.Boraldi Federica, Annovi Giulia, Carraro Fabio, Naldini Antonella, Tiozzo Roberta, Sommer Pascal, Quaglino Daniela, 2007, izvirni znanstveni članek Opis: The ability of cells to respond to changes in oxygen availability is critical for many physiological and pathological processes (i.e. development,
aging, wound healing, hypertension, cancer). Changes in the protein profile of normal human dermal fibroblasts were investigated in vitro after
96 h in 5% CO2 and 21% O2 (pO2=140 mm Hg) or 2% O2 (pO2=14 mm Hg), these parameters representing a mild chronic hypoxic exposure
which fibroblasts may undergo in vivo. The proliferation rate and the protein content were not significantly modified by hypoxia, whereas
proteome analysis demonstrated changes in the expression of 56 proteins. Protein identification was performed by mass spectrometry. Data
demonstrate that human fibroblasts respond to mild hypoxia increasing the expression of hypoxia inducible factor (HIF1a) and of the 150-kDa
oxygen-regulated protein. Other differentially expressed proteins appeared to be related to stress response, transcriptional control, metabolism,
cytoskeleton, matrix remodelling and angiogenesis. Furthermore, some of them, like galectin 1, 40S ribosomal protein SA, N-myc-downstream
regulated gene-1 protein, that have been described in the literature as possible cancer markers, significantly changed their expression also in
normal hypoxic fibroblasts. Interestingly, a bovine fetuin was also identified that appeared significantly less internalised by hypoxic fibroblasts. In
conclusion, results indicate that human dermal fibroblasts respond to an in vitro mild chronic hypoxic exposure by modifying a number of
multifunctional proteins. Furthermore, data highlight the importance of stromal cells in modulating the intercellular cross-talk occurring in
physiological and in pathologic conditions.
Ključne besede: Human fibroblast, Primary cell culture, Hypoxia, Connective tissue, Proteome, 2D gel electrophoresis, Mass-spectrometry
Objavljeno v RUNG: 22.07.2019; Ogledov: 3984; Prenosov: 0
Gradivo ima več datotek! Več... |
