混合型肝癌的肝脏祖细胞起源研究

目的混合型肝癌同时具有肝细胞癌和胆管细胞癌的成分和特征,是较为少见的肝脏上皮性恶性肿瘤。研究肝脏祖细胞标志物在混合型肝癌中的免疫表型特征,以进一步了解混合型肝癌的细胞起源和发病机理。方法采用免疫组织化学和激光共聚焦免疫荧光双标染色研究HepParl,AFP,CK19,OV-6和c-kit在12例手术切除混合型肝癌标本组织中的表达。结果12例混合型肝癌均表达HepParl、CK19和OV-6,其中8例（8/12,66.7%）的移行区域肿瘤细胞共表达HepParl/CKl9,10例（10/12,83.3%）表达c-kit,其中7例（7/10,70%）共表达OV-6/c-kit。而作为对照的单纯肝细胞癌和肝内胆管细胞癌组织中免疫荧光双标染色均为阴性。结论混合型肝癌具有肝脏祖细胞的免疫表型特征,可能起源于肝脏祖细胞的恶性转化。     

Grouped follicular secondary syphilis: Case report and review of literature

Secondary syphilis typically presents with macular, maculopapular or papular lesions, sometimes with systemic symptoms; however, there are some less common cutaneous presentations which can result in several differential diagnoses. We report the case of a 25-year-old man with the recent onset of a symmetric eruption of grouped follicular papules, for which syphilis was not originally considered. Histopathology revealed non-caseating granulomas with a lichenoid infiltrate. Subsequent spirochete immunostaining was positive, and further physical examination revealed moth-eaten alopecia, confirming the diagnosis of secondary syphilis.     

Analysis method of cellular stress caused by intermediate dose-rate irradiation using a cell lysate array technique

Ionizing radiation damages DNA and may lead to the development of cancer. Irradiation also generates reactive oxygen species (ROS) which cause damage to various biological molecules. Relatively low dose-rate irradiation causes less damage. However, the damage and its effects on cell fate are difficult to evaluate. To develop a method to analyze the damage and accompanying changes in physiology in cells irradiated by γ-rays at a relatively low dose-rate, we used the protein array technique to quantify marker proteins involved in the stress response and the regulation of cell growth and death. This method enabled efficient analyses of many replicates of experimental data on cell lysate samples. We detected relatively small changes in the levels of these proteins in the irradiated cells. Changes in protein levels suggested ROS production and DNA damage as well as cell cycle retardation and the progression of cellular senescence. Thus, our approach shows promise for analyzing the biological effects of relatively low dose-rate irradiation.