Analysis of filaggrin 2 gene polymorphisms in patients with atopic dermatitis

Abstract Background: Polymorphisms of the filaggrin 2 gene (rs 12568784 and rs 16899374) are associated with persistent atopic dermatitis in African American patients. Filaggrin 2 is a protein with a function similar to filaggrin and also encoded in the epidermal differentiation complex on chromosome 1q21. Objective: To evaluate the polymorphisms in the filaggrin 2 gene (rs 12568784 and rs 16899374) in children and adults with atopic dermatitis and to verify the association of these with the severity of the clinical picture, presence of other allergic diseases, and socio-demographic factors. Method: The study was carried out with patients and control group. Questionnaires were used to evaluate ethnicity, sex, age, family history, scoring, atopic dermatitis (SCORAD), among other parameters. Genotyping of the filaggrin 2 gene was performed by real-time polymerase chain reaction. Results: Forty-eight patients and 83 controls were evaluated. No correlation was found between the variables studied in patients with atopic dermatitis and polymorphisms, no significant difference between the prevalence of polymorphisms in the patients and in the control group p > 0.05. Study limits: The exclusive use of self-reported ethnicity information and the sample size. Results: The results of this work can be an incentive for the study of the polymorphisms in atopic dermaititis, considering the characteristic of the Brazilian multi ethnic population. Conclusion: This is an unpublished work in Brazil and the first study in the world to have a control group to evaluate alterations in the gene of filaggrin 2.

Efeitos de uma dieta hiperlipídica e de uma droga anti-inflamatória não-esteróide inibidora seletiva da ciclooxigenase-2 sobre a cicatrização cutânea de ratos Wistar propensos e resistentes a obesidade / Effects of a high fat diet and an anti-inflammatory drug non steroidal inhibitor selective of cyclooxygenase-2 on the cutaneous wound healing Wistar rats likely resistant to obesity

O sobrepeso induzido por uma dieta rica em gordura atrasa a cicatrização através do prolongamento da fase inflamatória, entretanto, quando recebem uma dieta obesogênica, alguns ratos são suscetíveis a desenvolver sobrepeso, enquanto outros são resistentes. Drogas anti-inflamatórias não-esteróides são frequentemente utilizadas para reduzir a inflamação. Este estudo investigou a cicatrização cutânea em ratos propensos a obesidade induzida por dieta (DIO) e em ratos resistentes a dieta (DR) e avaliou a participação da administração do celecoxibe na cicatrização cutânea destes animais. Ratos machos foram alimentados com uma dieta padrão (Controle, C) ou com uma dieta rica em gordura saturada (30%). Após 19 semanas, o grupo experimental foi subdividido nos grupos DIO e DR. Uma lesão excisional foi feita e os animais foram mortos 7 ou 14 dias depois. Os grupos tratados receberam uma dose diária de 5 ou 10 mg/kg/dia de celecoxibe a partir de dois dias antes da lesão até 7 dias após a lesão, quando foram mortos. O peso corporal foi maior no grupo DIO comparado aos grupos C e DR. A gordura retroperitoneal foi maior no grupo DIO do que nos grupos C e DR e foi maior no grupo DR do que no grupo C. O tratamento com o celecoxibe não alterou o maior peso corporal apresentado pelo grupo DIO ou a maior porcentagem de gordura retroperitoneal apresentada pelos grupos DIO e DR. Todos os grupos tratados com celecoxibe 10 mg apresentaram atraso na cicatrização e não foram mais analisados. O grupo DIO apresentou intolerância a glicose, e ambos os grupos DIO e DR apresentaram atraso na contração e na reepitelização da lesão. O tratamento com celecoxibe 5 mg reverteu a intolerância a glicose no grupo DIO e a contração atrasada nos grupos DIO e DR. Comparado ao grupo DR, o grupo DIO apresentou maior quantidade de células inflamatórias, assim como maiores níveis de peroxidação lipídica. O tratamento com celecoxib (5 mg) não reduziu o número de PMN, mas reduziu o número de mastócitos...

Overweight induced by high-fat diet delays wound healing through elongation of inflammatory phase, however, when receiving on obesogenic diet, some rats are susceptible to developing the overweight phenotype, whereas others are resistant. Nonsteroidal anti-inflammatory drugs are frequently used to reduce the inflammation. This study investigated cutaneous wound healing in diet-induced obesity (DIO)-prone and diet-resistant (DR) rats and evaluated the contribution of celecoxib administration on cutaneous wound healing of these animals. Male rats were fed with a standard (Control, C) or high-saturated fat (30%) diet. After 19 weeks, experimental group was subdivided into DIO and DR groups. An excisional lesion was made and the animals were killed 7 or 14 days later. Treated groups received a daily dose of celecoxib 5 or 10 mg/kg/day from two days before wounding until 7 days after wounding when were killer. The body weight was higher in the DIO group compared to the C and DR groups. Retroperitoneal fat was higher in the DIO group than in the C and DR groups and was higher in the DR group than in the C group. Celecoxib-treatment did not alter the higher body weight presented by DIO group of higher retroperitoneal fat percentage displayed by DIO and DR groups. All groups treated with celecoxib 10 mg showed delayed wound healing, and weren't further analysed. The DIO group presented glucose intolerance, and both the DIO and DR groups presented delayed wound contraction and re-epithelialisation. The celecoxib 5 mg-treatment reversed the glucose intolerance in the DIO group and the delayed contraction in the DIO and DR groups. Compared to the DR group, the DIO group displayed higher amounts of inflammatory cells as well as higher levels of lipid peroxidation. Celecoxib-treatment (5 mg) did not reduce the number of PMN, but reduce mast cells number in DIO group and macrophages number and lipid peroxidation in both groups. Myofibroblastic differentiation...