Proinflammatory and regulatory mechanisms in allergic contact dermatitis caused by methylchloroisothiazolinone and methylisothiazolinone.

BACKGROUND: Methylchloroisothiazolinone (MCI) and methylisothiazolinone (MI) are the cause of an increasing number of contact allergies. Understanding the mechanisms by which MCI/MI induces proinflammatory and regulatory factors production is necessary to understand the outcome of allergic contact dermatitis (ACD). OBJECTIVES: To evaluate the dysfunction of proinflammatory cytokines and regulatory factors in the positive MCI/MI patch test at the transcriptional and protein expression levels. Moreover, to analyse the cytokines production induced by MI in peripheral blood mononuclear cells (PBMCs). MATERIALS AND METHODS: The selected patients had positive MCI/MI patch test results. The expression of proinflammatory factors was evaluated by q-PCR and immunochemistry at 48 hours of positive MCI/MI patch test. The MCI/MI- or MI- induced secretion of IL-1ß, TNF and IL-6 by PBMC was analysed by flow cytometry. RESULTS: The results showed a decreased TLR4 expression with upregulated IL6, FOXP3, IL10 and TGFß mRNA expression as assessed by q-PCR at the site of the MCI/MI skin reaction. We detected increased protein levels of TLR4, FOXP3 and IL-10 in the dermis layer in the ACD reaction by immunocitochemistry. Moreover, MCI/MI induced proinflammatory cytokine production by PBMC through the NF-κB signalling pathway. CONCLUSION: Considering the altered innate immune response triggered by MCI/MI sensitization, these findings indicate that the regulatory process at the induction phase of ACD is a crucial mechanism. Given the increase in occupational and domestic exposure to MCI/MI, the underlying immunological mechanisms should be understood.

Sweet Syndrome: Clinical Features, Histopathology, and Associations of 83 Cases.

BACKGROUND: Sweet syndrome (SS) is an infrequent skin disease characterised by sudden onset of fever, leukocytosis, neutrophilia, and tender erythematous plaques infiltrated by neutrophils. Multiple conditions have been associated with this syndrome. OBJECTIVES: The aim of this study was to evaluate the clinical, epidemiological, laboratory, and histopathological findings and associations of patients with SS. METHODS: We conducted a retrospective study of 83 patients with SS followed between January 1, 2006, and January 31, 2015. RESULTS: Of the patients, 82% were female; the mean age at onset was 48 years. Clinical presentation was mainly characterised by erythematous and edematous plaques, mostly on upper extremities and trunk. Fever was observed in 32%; 60% presented leukocytosis and 39% neutrophilia. On histopathological examination, neutrophilic and lymphohistiocytic infiltrate and edema were the most frequent findings. Fourteen percent of patients had malignancy or hematologic disorders, 26% were classified as having drug-induced SS, and 24% noted recent infection. Only 2 cases occurred during pregnancy. Systemic corticosteroid was the most common choice of treatment, with excellent response. In malignancy-associated SS, the mean hemoglobin level was lower ( P = .01) and the erythrocyte sedimentation rate (ESR) was higher ( P = .04) in comparison to classic and drug-induced SS. Leukocytoclasia was associated with higher risk of recurrence ( P = .01). CONCLUSION: All patients with SS deserve careful investigation of possible underlying conditions. Higher ESR and lower hemoglobin levels might reinforce the need of malignancy screening. Also, leukocytoclasia appears to be a potential marker of higher recurrence rate, demanding closer and longer follow-up.

Subcisão e microagulhamento: relato de dois casos / Subcision and microneedling therapy: report of two cases

As lesões inflamatórias da acne podem resultar em cicatrizes permanentes, e vários tratamentos são propostos para reduzir sua aparência. Relatam-se os casos de dois pacientes, um homem e uma mulher com cicatrizes de acne distróficas, distensíveis retráteis e crateriformes na face, em que se optou pelo uso da subcisão nas áreas cicatriciais. Na paciente do sexo feminino foi associado na mesma sessão o microagulhamento. Houve bom resultado clínico nas áreas tratadas dos dois pacientes após três sessões mensais.

Inflammatory acne lesions may cause unaesthetic scars. Several treatments have been described to ameliorate its appearance. Will be described the treatment with subcision in two patients with acne and dystrophic crateriform facial scars. The female patient performed Microneedling in the same session of subcision. There was good clinical outcome in the treated areas of both patients after three monthly sessions.