[show abstract][hide abstract] ABSTRACT: Photoaging is cumulative damage to skin, caused by chronic, repeated solar radiation exposure. Its molecular mechanisms are poorly understood at the level of global gene expression.
This study set out to uncover genes and functional modules involved in photoaging at the level of transcription, with the use of skin samples from Chinese women.
Using the Illumina microarray platform, we compared the genome-wide expression profiles of 21 pairs of sun-exposed pre-auricular and sun-protected post-auricular skin samples from northern Chinese women.
With microarray analysis, 1,621 significantly regulated genes due to photoaging were identified from skin samples. These genes were subjected to functional enrichment analyses with both the Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) annotation databases. As revealed by the functional analyses, the up-regulated functional modules in sun-exposed pre-auricular skin were related to various cellular activities in regulation of the skin homeostasis (e.g., the KEGG pathways TGF-beta signaling pathway and ECM-receptor interaction), whereas the down-regulated functional modules were mostly metabolic-related. Additionally, five selected genes (HOXA5, LEPR, CLDN5, LAMC3, and CGA) identified as differentially-expressed were further confirmed by quantitative real-time PCR (Q-RT-PCR).
Our findings suggest that disruption of skin homeostasis and down-regulation of skin metabolism may play important roles in the process of photoaging.
PLoS ONE 01/2013; 8(4):e61946. · 3.73 Impact Factor
[show abstract][hide abstract] ABSTRACT: To assess the feasibility and actuality of MR imaging on diagnosis and evaluation of velopharyngeal insufficiency preoperatively.
Since 2002, six patients with velopharyngeal insufficiency were examined with MRI using midsagittal, coronal, and axial images, contrast with radiography, to affirm configuration and movements of soft palate, posterior and lateral pharyngeal walls, and velopharyngeal opening for the choices of following surgeries.
MRI visualizes directly and measures objectively the shorter soft palate, confined movements of soft palate, lateral or/and posterior pharyngeal wall, and deeper and enlarged velopharyngeal opening, which were coincided with clinical symptoms and affirmed by observations in the following operations, surpassing radiography.
MRI is effective, actual, and uninvasive in imaging and measuring the velopharyngeal insufficiency, thus has a potential role in investigation and planning surgical repairs.
Zhonghua zheng xing wai ke za zhi = Zhonghua zhengxing waike zazhi = Chinese journal of plastic surgery 01/2007; 23(1):19-22.