Effects of Aging and Cyclosporin A on Collagen Turnover in Human Gingiva

BACKGROUND: WE AIMED AT CHARACTERIZING THE AGING GINGIVA ANALYZING: i) collagen content and turnover in human gingival tissues and fibroblasts obtained from healthy young and aging subjects. ii) the effect of cyclosporin A administration in human cultured gingival fibroblasts obtained from aging compared to young subjects. METHODS: Morphological analysis was performed on haematoxylin-eosin and Sirius red stained paraffin-embedded gingival biopsies from young and aging healthy subjects. The expression of the main genes and proteins involved in collagen turnover were determined by real time PCR, dot blot and SDS-zymography on cultured young and aging gingival fibroblasts, and after cyclosporin A administration. RESULTS: Our results suggest that in healthy aged people, gingival connective tissue is characterized by a similar collagen content and turnover. Collagen turnover pathways are similarly affected by cyclosporin A treatment in young and aging gingival fibroblasts. CONCLUSIONS: Cyclosporin A administration affects gingival collagen turnover pathways in young and aging fibroblasts at the same extent, suggesting that during aging cyclosporin A administration is not related to relevant collagen turnover modifications

Meta-Profiles of Gene Expression during Aging: Limited Similarities between Mouse and Human and an Unexpectedly Decreased Inflammatory Signature

Background: Skin aging is associated with intrinsic processes that compromise the structure of the extracellular matrix while promoting loss of functional and regenerative capacity. These processes are accompanied by a large-scale shift in gene expression, but underlying mechanisms are not understood and conservation of these mechanisms between humans and mice is uncertain. Results: We used genome-wide expression profiling to investigate the aging skin transcriptome. In humans, age-related shifts in gene expression were sex-specific. In females, aging increased expression of transcripts associated with T-cells, B-cells and dendritic cells, and decreased expression of genes in regions with elevated Zeb1, AP-2 and YY1 motif density. In males, however, these effects were contrasting or absent. When age-associated gene expression patterns in human skin were compared to those in tail skin from CB6F1 mice, overall human-mouse correspondence was weak. Moreover, inflammatory gene expression patterns were not induced with aging of mouse tail skin, and well-known aging biomarkers were in fact decreased (e.g., Clec7a, Lyz1 and Lyz2). These unexpected patterns and weak human-mouse correspondence may be due to decreased abundance of antigen presenting cells in mouse tail skin with age. Conclusions: Aging is generally associated with a pro-inflammatory state, but we have identified an exception to this pattern with aging of CB6F1 mouse tail skin. Aging therefore does not uniformly heighten inflammatory status across all mouse tissues. Furthermore, we identified both intercellular and intracellular mechanisms of transcriptome aging, including those that are sex- and species-specific

N012 Endovascular gingival fibroblast cell therapy reduced the size of aneurysms in a rabbit model of elastase-induced carotid injury

BackgroundAortic abdominal aneurysm is characterized by excessive enlargement remodeling secondary to medial elastin destruction, and the severity of the disease has been correlated with metalloproteinase-9 (MMP-9). We aimed to evaluate whether embryo-like healing potential of a tissue (i.e., the gum) could be transposed to another tissue (i.e., the artery wall).Methods and ResultsPorcine pancreatic elastase was incubated during 15minutes in rabbit carotid arteries (n=30). Four to 6 weeks later, carotid arteries were seeded endoluminally at the site of aneurysm with either rabbit gingival fibroblasts (n=12) or culture medium only which served as control (n=11). Vessel diameter and elastin density were assessed 4 weeks after cell therapy. Carotid diameter was similar before cell therapy in both group (3.4±0.5mm vs 3.1±0.37mm, p=0.30). In contrast, carotid diameters were significantly decreased in aneurismal arteries seeded with rabbit gingival fibroblasts as compared to control aneurismal arteries (2.7±0.64mm vs 3.60±0.52, p=0.003). Moreover, elastin density was significantly higher in the media after endovascular gingival fibroblast than in controls (32.5±4.7 % vs 14.3±8.2 %, p=0.001). Four weeks after cell transplantation, gingival fibroblasts inhibited MMP-9 secretion via a significant increase of its inhibitor, TIMP-1.ConclusionsEndovascular gingival fibroblast cell therapy improved elastin network and reduced the size of aneurysms in a rabbit model. This strategy may be attractive since gingival fibroblast are easily accessible are known to safely proliferate in culture medium

Oral manifestations of sickle cell disease

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Protective effect of a vegetable extract from Lupinus albus (LU 105) on human gingival elastic fibers degradation by human leukocyte elastase

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