Molecular Analysis and Characteristics of Ethnic Skin
ABSTRACT: In this study, we used microarray analysis to investigate molecular differences underlying the determination of pigmentation in various skin types, and we used immunohistochemistry to validate the expression patterns of several interesting targets that were identified. Whole skin gene expression profile were investigated in three ethnic groups:1) Caucasian 2)Asian 3)African. In each group, 4 mm whole skin punch biopsies were taken from forearm of 10 subjects, and gene expression level were tested by agilent whole human genome microarray. Samples with mRNA degraded: African_skin_03, Asian_skin_02, Asian_skin_06, and Caucasian_skin_7.
Differences in visible skin pigmentation give rise to the wide variation of skin colours seen in racial/ethnic populations. Skin pigmentation is important not only from cosmetic and psychological points of view, but more importantly because of its implications for the risk of all types of skin cancers, on photoaging, etc. Despite differences in those parameters in Caucasian and Asian skin types, they are remarkably similar in their production and distribution of melanins, and the mechanism(s) un ...[more]
Project description:In this study, we used immunohistochemical analysis and microarray analysis to investigate the mechanism underlying the development of age spots, focusing on the expression of specific markers associated with the functions and proliferation of melanocytes and keratinocytes 10 subjects of phototypes I or II (all female, age = 53-70) with various sizes and colors of age spots on their forearms were recruited for the study. Four mm whole skin punch biopsies were taken from age spots on the forearm of each subject and from a perilesional control area in the vicinity of each age spot.
Project description:To test whether there is a photoprotective benefit after different types of suberythemal repetitive UV, a 1.5 MED challenge dose was applied 1 week after the initial 2 weeks of repetitive irradiation. To determine what different mechanisms and/or factors might be involved in physiological pigmentary responses of the skin to different types of UV, we used whole human genome microarrays and immunohistochemical analyses to characterize human skin in situ to examine how melanocyte-specific proteins and paracrine melanogenic factors are regulated by repetitive exposure to suberythemal doses of different types of UV (UVA and/or UVB). Seven volunteers with skin type II-III were irradiated with UVA, UVB or UVA+UVB radiation for 2 weeks (5 times per week, 10 times total) after preliminary determination of their MEDs. A UVA+UVB challenge dose of 1.5X the MED was applied 1 week later. Biopsies were taken before the challenge dose, immediately after the challenge dose, 4 days after the challenge, and 15 weeks after the challenge.
Project description:In order to test the gene expression profile in postinflammatory hyperpigmentation, micoarray studies were performed. Totally 14 subjects ( 7 at each phase) were treated by suction blister, and samples from treated area and corresponding control area ( from the same subjects) were taken at 1 week(t1), 2 weeks(t2), 4 weeks(t3), 6 weeks(t4), and 16 weeks(t5) after treatment. Paired samples from subject 6382 at 6th week were missing for microarray hybridization. Therefore, there are 138 array chips available for statistical analysis.
Project description:Anti-TNF therapy has transformed the management of rheumatoid arthritis (RA); however little is known about its effects on cell mediated immune responses and TNF-inducible activity at the site of inflammation. Here, we used the tuberculin skin test (TST) as a standardised in vivo human challenge model to make systems level assessments of the effects of anti-TNF therapy in a prototypic cell mediated immune response. RA patients (treated with monoclonal anti-TNF antibodies (adalimumab or infliximab), the soluble TNF receptor etanercept or the standard therapy methotrexate) and healthy volunteers with immunological memory to Mycobacterium tuberculosis antigens were identified using an interferon-γ release assay of peripheral blood. Two units tuberculin or an equivalent volume of saline was injected into the forearm of study participants (n=50). After 72 hours, 3 mm skin punch biopsies were taken from the injection site and processed for whole genome transcriptional profiling by Agilent gene microarray.
Project description:The study aimed at defining the local and systemic innate responses after intradermal injection of flagellin. For this purpose, mice were immunized by intradermal route with flagellin. Skin and blood were then sampled at selected times for microarray analyses. Mice were then immunized with the TLR5 agonist flagellin by intradermal route. Blood samples and punch biopsies of skin were sampled post-immunization and on mock animals. Total RNA was extracted and microarray experiments were performed as single-color hybridizations on Agilent 4x44K mouse whole genome catalog arrays (Agilent-014868) according supplier's recommendations.
Project description:The Malaysian Node of the Human Variome Project Database (MyHVPDb) is a country specific database of human variant and gene mutation that was established in 2011. This ethnic specific mutation and variation databases are being continuously updated, recording extensive information over the genetic heterogeneity of the Malaysian ethnic groups. The database comprises of SNP Database and Mutation Database. The SNP database has stored 291718 SNPs that was obtained by genotyping the SNPs of 101 healthy individuals from six Malay sub-ethnic groups which consist of Malay Kelantan, Malay Banjar, Malay Kedah, Malay Jawa, Malay Bugis and Malay Champa. Affymetrix SNP arrays were performed according to the manufacturer's directions on DNA extracted from blood samples.
Project description:A total of 3 patients with basal cell carcinoma (BCC) and 3 healthy individuals (control; non-lesional skin) were enrolled in the study. Punch biopsies (4 mm) were obtained under local anaesthesia and immediately put in RNAlater (Qiagen, Hilden, Germany) and stored at - 80 °C until RNA extraction. The lncRNA and mRNA expression in BCC was compared to lncRNA and mRNA expression in non-lesional skin (control).
Project description:We were interesed in defining the gene signautre of volar skin. Whole skin punch biopsies of palms, backs of hand, soles and backs of feet were submitted for Affymetrix Exon arrays. 4 replicates of each site from distinct human donors were included; total of 16 samples analyzed.
Project description:Using microarray analysis, we explored the differences in gene expression in wounded and intact skin using murine model. Injured skin samples were examined at days 1 and 4 post injury. The results provide the detailed molecular profile of the the genetic response to injury. Two full-thickness dermal wounds were made on the opposite sides of the midline of each mouse using a 4 mm punch biopsy instrument. Wounds were made through the epidermis, dermis, and subcutaneous tissue layers while leaving the fascia intact. At a specified time point after the wounding (1 and 4 days), mice were sacrificed by carbon dioxide inhalation. The wounds and surrounding tissues or intact skin samples were removed with an 8 mm biopsy punch.
Project description:We aimed to characterize transcriptomic changes over time (baseline, 2 hours, 48 hours and 96 hours) after nickel-induced contact dermatitis in 6 human probands. As a contrast, 7 patients with SLS-induced irritant contact dermatitis were included. Therefore, the patch tests were applied onto the back of the individuals and punch biopsies were taken at the respective time points. Only skin with clear reactions was further used for transcriptomic analysis. Using gene set enrichment analysis and leukocyte deconvolution algorithm, we were able to identify important immune cell subsets and related functions within the human skin.