Centella asiatica extracts modulate hydrogen peroxide-induced senescence in human dermal fibroblasts
ABSTRACT Centella asiatica (C. asiatica) is a pharmacological plant in South Asia. It has been demonstrated that C. asiatica extracts containing various pentacyclic triterpenes exert healing effects, especially wound healing and collagen synthesis in skin. However, there are few studies on the effect of C. asiatica extracts on stress-induced premature senescence (SIPS). To determine whether H(2) O(2) -induced senescence is affected by C. asiatica extracts, we performed senescence analysis on cultured human dermal fibroblasts (HDFs). We also analysed whole gene expression level using microarrays and showed that 39 mRNAs are differentially expressed in H(2) O(2) -induced HDFs with and without treatment with C. asiatica extracts. These genes regulate apoptosis, gene silencing, cell growth, transcription, senescence, DNA replication and the spindle checkpoint. Differential expression of FOXM1, E2F2, MCM2, GDF15 and BHLHB2 was confirmed using semi-quantitative PCR. In addition, C. asiatica extracts rescued the H(2) O(2) -induced repression of replication in HDFs. Therefore, the findings presented here suggest that C. asiatica extracts might regulate SIPS by preventing repression of DNA replication and mitosis-related gene expression.
SourceAvailable from: Cumhur İbrahim Başsorgun[Show abstract] [Hide abstract]
ABSTRACT: GDF-15 (Growth Differentiation Factor-15) is a member of the transforming growth factor β (TGF-β) superfamily. GDF-15 is not only involved in cancer development, progression, angiogenesis and metastasis, but also controls stress responses, bone formation, hematopoietic development, adipose tissue function and cardiovascular diseases. GDF-15, which is regulated by p53, has shown antitumorigenic and proapoptotic activities in vivo and in vitro. Also, GDF-15 is involved in skin biology and histamine-induced melanogenesis; it is overexpressed in melanoma cells and is associated with depth of tumor invasion and metastasis. GDF-15 level is increased in patients with systemic sclerosis and is related with the degree of skin sclerosis and intensity of pulmonary fibrosis. In the future, GDF-15 may be a potential target for therapy in benign disorders with skin fibrosis and malignant lesions of the skin.Archives for Dermatological Research 02/2015; DOI:10.1007/s00403-015-1546-2 · 2.27 Impact Factor
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ABSTRACT: Ultraviolet (UV) radiation impairs intracellular functions by directly damaging DNA and by indirectly generating reactive oxygen species (ROS), which induce cell cycle arrest and apoptosis. UV radiation can also alter gene expression profiles, including those of mRNA and microRNA (miRNA). The effects of UV radiation on cellular functions and gene expression have been widely documented in human skin cells such as keratinocytes, melanocytes and dermal fibroblasts, but the effect it has on other types of skin cell such as dermal papilla cells, which are crucial in the induction of hair follicle growth, remains unknown. In the current study, the effect of UV radiation on physiological changes and miRNA‑based expression profiles in normal human dermal papilla cells (nHDPs) was investigated. UVB radiation of ≥50 mJ/cm2 displayed high cytotoxicity and apoptosis in a dose‑dependent manner. In addition, ROS generation was exhibited in UVB‑irradiated nHDPs. Furthermore, using miRNA microarray analysis, it was demonstrated that the expression profiles of 42 miRNAs in UVB‑irradiated nHDPs were significantly altered compared with those in the controls (35 upregulated and 7 downregulated). The biological functions of the differentially expressed miRNAs were studied with gene ontology analysis to identify their putative target mRNAs, and were demonstrated to be involved in cell survival‑ and death‑related functions. Overall, the results of the present study provide evidence that miRNA‑based cellular mechanisms may be involved in the UVB‑induced cellular response in nHDPs.Molecular Medicine Reports 07/2014; 10(4). DOI:10.3892/mmr.2014.2418 · 1.48 Impact Factor
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ABSTRACT: AimThe present study evaluated the effects of a topical herbal patch (PerioPatch®) for gingival wound healing in a rat model.Materials and MethodsA mid-crestal incision was performed on each side of the edentulous anterior maxilla in 48, six-month-old, Wistar rats. Full thickness flaps were raised, repositioned and sutured. Four experimental groups were established: herbal patch, placebo patch, no patch and no patch and no surgery. Patches were placed immediately after surgery and replaced every 12 hours for the following 3 days. Half of the animals were sacrificed after 5 and the remaining ones after 12 days. Tissue blocks were retrieved and processed for histological and immunohistochemical evaluation. Epithelial gap, collagen contents, amount of macrophages, cellular proliferation, and vascular contents were evaluated in the central incision area. Statistical analysis consisted of 2-way ANOVA.ResultsThe herbal patch group presented the smallest epithelial gap at 12 days, the highest collagen content both at 5 and 12 days, a larger number of proliferating cells at day 5 and more numerous blood vessels at day 12. Macrophage number was similar in all groups.Conclusion Herbal patch improved wound healing in this animal model.This article is protected by copyright. All rights reserved.Journal Of Clinical Periodontology 01/2015; 42(3). DOI:10.1111/jcpe.12372 · 3.61 Impact Factor