A Case of Systemic Lupus Erythematosus Initially Presented with Acute Acalculous Cholecystitis

SLE is an autoimmune disease with multiorgan involvement and a wide range of clinical manifestations, and inflammation of gallbladder also can be represented. There were a few cases of acute acalculous cholecystitis (AAC) in previous reports. Most of them tended to already know about underlying SLE when detected AAC at that time. It may be difficult to detect AAC caused by SLE not due to biliary stone if physician is not conscious of undiagnosed lupus. We introduce a 70-year old female patient, who is diagnosed with AAC. Her symptoms were satisfied the ACR classification criteria for SLE, and was diagnosed with SLE, simultaneously. After a high dose steroid pulse therapy, followed by cyclophosphamide, her symptoms have improved rapidly. In order to better diagnose and treat the disease, we need to be aware of AAC as a potential manifestation of SLE.

A Case of Dermatomyositis Complicated with Pneumomediastinum Successfully treated with Cyclosporine A: a Case Report and Review of Literature

Dermatomyositis (DM) is a systemic inflammatory disease affecting skeletal muscles and other organs. Spontaneous pneumomediastinum (PnM) has been previously reported as a rare complication of DM and it is known to occur more frequently in patients with interstitial lung disease (ILD). Here we report on a case of a 52-year-old woman with DM who developed spontaneous PnM, which was treated successfully with high-dose steroid pulse therapy and cyclosporine A (CsA). This case suggests that CsA can be an effective therapeutic agent in DM refractory to glucocorticoid therapy, with ILD or pulmonary fibrosis accompanied by DM. CsA should be considered as an initial immunosuppressive agent for patients with PnM in DM.

A Case of Behcet's Disease with Both Esophageal and Pharyngeal Ulcers Successfully treated with Steroid and Sulfasalazine

Behcet's disease is a heterogeneous disease that involves variable organ systems. Gastrointestinal Behcet's disease is rare and it generally affects the terminal ileum with propagation toward the cecum and ascending colon. Therefore, esophageal ulcer associated with Behcet's disease has not been reported frequently. We report an unusual case of Behcet's disease associated with both esophageal and pharyngeal ulcers. A 64-year-old man was admitted for an evaluation of pharyngeal and substernal discomfort sustained for 3 months. He had no underlying chronic disease; however, he suffered from recurrent oral and genital ulcers for 20 years and had folliculitis-like skin lesions on the face, scalp and trunk. He was diagnosed with Behcet's disease and gastroesophageal fiberscopy revealed deep ulcers on both the pharynx and upper esophagus. Esophagopharyngeal ulcers were successfully treated with prednisolone, colchicines, dapsone, and sulfasalazine.

Effect of xanthohumol on melanogenesis in B16 melanoma cells

Xanthohumol (XH), the principal prenylflavonoid of the hop plant (Humulus lupulus L.), dose-dependently inhibited isobutylmethylxanthine (IBMX)-induced melanogenesis in B16 melanoma cells, with little cytotoxicity at the effective concentrations. Decreased melanin content was accompanied by reduced tyrosinase enzyme activity, protein and mRNA expression. The levels of tyrosinase-related protein 1 and 2 mRNAs were decreased by XH. XH also inhibited alpha-melanocyte stimulating hormone- or forskolin-induced increases in melanogenesis, suggesting an action on the cAMP-dependent melanogenic pathway. XH downregulated the protein and mRNA expression of microphthalmia-associated transcription factor (MITF), a master transcriptional regulator of key melanogenic enzymes. These results suggest that XH might act as a hypo-pigmenting agent through the downregulation of MITF in the cAMP-dependent melanogenic pathway.

Effect of Hypoxia on the Melanogenesis of Murine B16 Melanoma Cells / 대한피부과학회지

BACKGROUND: Numerous reports suggest the role of oxygen in melanogenesis. However, little has been reported on the effect of a hypoxic environment on cellular melanogenesis. OBJECTIVE: The effect of low oxygen tension on cellular melanogenesis was investigated in B16 murine melanoma cells. METHODS: Using cells cultured under an ambient (21% O2) or hypoxic (5% O2) condition, melanin content and tyrosinase activity were measured spectrophotometrically. The expression of tyrosinase, tyrosinase-related protein (TRP)- 1, and TRP-2 were analyzed by RT-PCR and Western blot. RESULTS: Culture of cells under hypoxic conditions caused significant inhibition of isobutylmethylxanthine (IBMX)- induced increase of melanin content. No cytotoxicity was observed during the hypoxic culture periods. Decreased melanin content occurred through the decrease of tyrosinase protein and activity (p<0.01). The mRNA levels of tyrosinase and TRP-2 were also decreased by hypoxia, while that of TRP-1 was unchanged. Similar inhibitions of melanin content and tyrosinase activity were observed in the cells stimulated with dibutyryl-cAMP. CONCLUSION: IBMX-induced melanogenesis in B16 cells was significantly inhibited under hypoxic culture conditions, suggesting the important role of oxygen tension in cellular melanogenesis.