Jae Bin Shin

Cutaneous T Cell Pseudolymphoma at the Site of a Semipermanent Lip-Liner Tattoo

the infiltrated cells strongly expressed CD3 antigen ( fig. 2 b). The lymphocytes were CD68 negative, but the macrophages partially expressed CD68 ( fig. 2 c). CD20 and terminal deoxynuleotidyl transferase were negative ( fig. 2 d, e). Ki-67 had a low proliferation index ( fig. 2 f). A T cell receptor gene rearrangement study was performed on paraffin-embedded skin and showed a polyclonal pattern. We attempted treatment with a 595-nm pulsed dye laser, but there was no improvement after 4 sessions. Thereafter, the patient underwent intralesional triamcinolone injections at 2or 3-week intervals for 4 months. The lesion responded gradually and marked clinical improvement was observed ( fig. 1 b). During a fol-

Giant Acral Melanoma on the Left Thumb of a Korean Patient

The acral regions of the limbs of Asians are predisposed to develop malignant melanoma, but giant-sized acral melanoma has not been previously reported in the Asian population. Giant-sized melanoma implies aggressive tumor invasion and so it is more difficult to achieve a therapeutic cure. A 56-year-old woman presented with a giant acral melanoma of the left thumb with concomitant bone destruction and axillary lymph node metastasis. The initial lesion was a subungual black macule on the left thumb that had grown into a giant 7.0x4.0x3.5 cm-sized melanoma over a 3 year period. The left thumb was amputated and the axillary lymph nodes were completely dissected. During the ensuing 3 months, she underwent adjuvant treatment with interferon-alpha-2a. The interesting feature of this case is that the large melanoma mass of this patient, which was accompanied with adjacent bone destruction and lymph node metastasis, had developed rapidly from a small black macule in the nail matrix, and this black macule was suspected to be a subungual melanoma.

Cigarette smoke-induced Egr-1 represses TβR-II expression in human skin dermal fibroblasts

Tobacco smoking is one of the many factors that contribute to premature skin aging, but the exact mechanism by which smoking induces facial wrinkling is still poorly understood. To investigate the regulatory potential of early growth response-1 (Egr-1) on the premature skin aging by smoking, this study examined the hypothesis that cigarette smoke-induced Egr-1 represses T beta R-II expression in human skin dermal fibroblasts (HSDFs). The protein and mRNA expressions of Egr-1 and T beta R-II were detected using Western blot and real-time RTPCR in HSDFs after exposure to cigarette smoke extract (CSE). Egr-1 and T beta R-II promoter activities were analyzed in CSE-exposed fibroblasts using luciferase assay. T beta R-II promoter activity was also evaluated in HSDFs to be transfected with Egr-1 overexpression vector. To investigative Egr-1-specific effects, we utilized Egr-1 small interfering RNA (siRNA) to inhibit Egr-1 expression. The expressions of Egr-1 protein and mRNA were increased in a time and dose-dependent manner. CSE also induced Egr-1 at the transcription level. Egr-1 was induced though phosphorylation of Erk1/2 after CSE exposure in HSDFs. We also observed the immunostained Egr-1 proteins were mainly localized from the cytoplasm to the nucleus after CSE treatment by immunocytochemical analyzes. Furthermore, T beta R-II protein and mRNA levels were decreased in a dose-dependent manner by CSE and T beta R-II promoter activity was significantly repressed by CSE. HSDFs transfected with Egr-1 overexpression vector showed significantly reduced T beta R-II promoter activity. In addition, T beta R-II mRNA levels were upregulated in HSDFs transfected with Egr-1 siRNA, suggesting that T beta R-II expressional downregulation by CSE is induced via an Egr-1-dependent mechanism. This study suggests that the downregulation of T beta R-II expression by cigarette smoke-induced Egr-1 may contribute to smoking-induced premature skin aging.

Nuchal-type Fibroma of the Coccyx

Nuchal-type fibroma is a recently described, rare, tumor-like process of fibrous tissue occurring chiefly in the dorsocervical area. Nuchal-type fibromas in extranuchal locations are morphologically indistinguishable from lesions involving the nuchal region. Histopathologic findings of nuchal-type fibroma are poorly demarcated, dense collagen bundles with sparsely scattered fibroblasts, some interspersed adipose tissue, and entrapped nerve fibers. We report a patient with a mass on the coccyx area, and these were histopathologically consistent with nuchal-type fibroma. This tumor was surgically excised, and no recurrence had been noted during the two year follow-up period.