RESUMO
Little is known about the altered lipid metabolism-related transcriptional events occuring in sebaceous glands of patients with acne vulgaris. Peroxisome proliferator-activated receptor (PPAR)γ, a lipid-activated transcription factor, is implicated in differentiation and lipid metabolism of sebocytes. We have observed that PPARγ and its target genes, ADRP (adipose differentiation related protein) and PGAR (PPARγ angioprotein related protein) are expressed at lower levels in sebocytes from patients with acne than in those from healthy controls (HCs) Furthermore, endogenous PPARγ activator lipids such as arachidonic acid-derived keto-metabolites (e.g. 5KETE, 12KETE) are increased in acne-involved and nonacne-involved skin of patients with acne, compared with skin from healthy individuals. Our findings highlight the possible anti-inflammatory role of endogenous ligand-activated PPARγ signaling in human sebocyte biology, and suggest that modulating PPARγ- expression and thereby signaling might be a promising strategy for the clinical management of acne vulgaris.
Assuntos
Acne Vulgar/metabolismo , PPAR gama/metabolismo , Glândulas Sebáceas/metabolismo , Transdução de Sinais/fisiologia , Adulto , Análise de Variância , Proteína 4 Semelhante a Angiopoietina , Angiopoietinas/metabolismo , Estudos de Casos e Controles , Eicosanoides/metabolismo , Feminino , Regulação da Expressão Gênica , Humanos , Imuno-Histoquímica , Masculino , Perilipina-2/metabolismo , RNA Mensageiro/metabolismoRESUMO
Blepharochalasis is a rare disorder characterized by recurrent painless periorbital oedema, which leads to atrophy of the periorbital skin. Pathomechanism of the disease is probably immunological with a nearly complete loss of elastic fibres. The authors describe a 17-year-old woman, who was followed for 7 years. IgA deposits were found in the periorbital tissues, which confirm the immunological background of the condition. Electron microscopy results show that not only elastic but also collagen fibres were affected.
