微小染色体维持蛋白与肿瘤的研究进展

微小染色体维持(MCM)蛋白家族是一类从太古代生物到高等真核生物广泛存在的高度保守的蛋白质。MCM蛋白与其他相关因子相互影响,共同在DNA复制、延长、转录及修复过程中发挥作用。MCM蛋白在细胞周期中异常高表达意味着细胞非典型增生甚至肿瘤的发生,提示MCM蛋白可作为增殖细胞的特殊标志物,在肿瘤的诊断、预后评价、临床治疗等方面具有广泛的应用前景。     

多媒体技术在医学影像教学实践中的应用

医学影像学是一门实践性很强的形象思维学科,如何合理应用多媒体技术手段开展现代医学影像学教学,本文就多媒体技术与传统板书教学的有机结合进行了有益的探讨。强调做好现代多媒体技术手段教学与传统教学的重要性是医学影像学教学一个值得重视和思考的问题。     

The early history of the transmissible spongiform encephalopathies exemplified by scrapie

Transmissible spongiform encephalopathies (TSE) is a group of diseases that is unique in comprising disorders that can occur sporadically, are hereditary and/or infectious. The transmissible pathogen--the prion--is distinct from all other pathogens in being devoid of nucleic acids. During the elucidation of these disorders, many different--and contradictory--theories have been put forward. Early researchers, mostly driven by the economic impact of these diseases on sheep farming, engaged in heavy disputes concerning heredity vs. infectivity of scrapie. Following the experimental demonstration of scrapie's infectivity during the 20th century, research focused on the characterization of the nature of the transmissible agent. The current work comprehensively summarizes the available early literature on TSE research. A review of the historical literature is presented, describing the efforts in breeding, transmission experiments, and theories about the nature of the infectious agent.     

Complementary feeding: a commentary by the ESPGHAN Committee on Nutrition

This position paper on complementary feeding summarizes evidence for health effects of complementary foods. It focuses on healthy infants in Europe. After reviewing current knowledge and practices, we have formulated these conclusions: Exclusive or full breast-feeding for about 6 months is a desirable goal. Complementary feeding (ie, solid foods and liquids other than breast milk or infant formula and follow-on formula) should not be introduced before 17 weeks and not later than 26 weeks. There is no convincing scientific evidence that avoidance or delayed introduction of potentially allergenic foods, such as fish and eggs, reduces allergies, either in infants considered at increased risk for the development of allergy or in those not considered to be at increased risk. During the complementary feeding period, >90% of the iron requirements of a breast-fed infant must be met by complementary foods, which should provide sufficient bioavailable iron. Cow's milk is a poor source of iron and should not be used as the main drink before 12 months, although small volumes may be added to complementary foods. It is prudent to avoid both early (<4 months) and late (>or=7 months) introduction of gluten, and to introduce gluten gradually while the infant is still breast-fed, inasmuch as this may reduce the risk of celiac disease, type 1 diabetes mellitus, and wheat allergy. Infants and young children receiving a vegetarian diet should receive a sufficient amount ( approximately 500 mL) of breast milk or formula and dairy products. Infants and young children should not be fed a vegan diet.     

Quantifying the relationship of HIV infection with clinicopathological spectrum and outcome among patients with colorectal cancer in a South African population

IntroductionLiterature is limited on HIV and colorectal cancer (CRC) in sub-Saharan Africa despite it being the epicentre of the HIV epidemic,PurposeTo compare clinicopathological features and outcome of CRC in HIV-negative and HIV-positive patients.MethodsRetrospective analysis of a prospective CRC database. Demographic details, HIV status, anatomical site, disease stage, treatment and follow-up were documented.ResultsOf 715 patients with CRC, 145 and 570 tested positive and negative respectively for HIV. Median age was 45 (IQR 36–53 and 57 (IQR 45–66) years among HIV-positive and HIV-negative patients respectively (p<0.0001). Tumour differentiation differed between the two groups (p=0.003) but staging was not different (p=0.6). Surgical resection rate was 52% for HIV-positive patients versus 59% for HIV-negative patients (p=0.07). Median follow-up was 9 (IQR 2–20.5) months for HIV-positive patients and 12 (IQR 6–29) months for HIV-negative patients (p=0.154). Recurrence rate was 14.7% among HIV positive patients and 6.8% in HIV negative patients (p=0.089).ConclusionWhen compared with HIV-negative patients, HIV-positive patients with CRC presented at a younger age and tended to have lower surgical resection rates. There was no difference between the two groups with CRC in terms of anatomical sub-site distribution, disease staging and recurrence rates.     

Ueber den Einfluss der Exstirpation der Schilddrüse auf den Gaswechsel bei Katzen

Ohne Zusammenfassung     

Differential expression of checkpoint markers in the normoxic and hypoxic microenvironment of glioblastomas

Glioblastoma is the most common primary malignant brain tumor in adults with an overall survival of only 14.6 months. Hypoxia is known to play a role in tumor aggressiveness but the influence of hypoxia on the immune microenvironment is not fully understood. The aim of this study was to investigate the expression of immune-related proteins in normoxic and hypoxic tumor areas by digital spatial profiling. Tissue samples from 10 glioblastomas were stained with a panel of 40 antibodies conjugated to photo-cleavable oligonucleotides. The free oligo-tags from normoxic and hypoxic areas were hybridized to barcodes for digital counting. Differential expression patterns were validated by Ivy Glioblastoma Atlas Project (GAP) data and an independent patient cohort. We found that CD44, Beta-catenin and B7-H3 were upregulated in hypoxia, whereas VISTA, CD56, KI-67, CD68 and CD11c were downregulated. PD-L1 and PD-1 were not affected by hypoxia. Focusing on the checkpoint-related markers CD44, B7-H3 and VISTA, our findings for CD44 and VISTA could be confirmed with Ivy GAP RNA sequencing data. Immunohistochemical staining and digital quantification of CD44, B7-H3 and VISTA in an independent cohort confirmed our findings for all three markers. Additional stainings revealed fewer T cells and high but equal amounts of tumor-associated microglia and macrophages in both hypoxic and normoxic regions. In conclusion, we found that CD44 and B7-H3 were upregulated in areas with hypoxia whereas VISTA was downregulated together with the presence of fewer T cells. This heterogeneous expression should be taken into consideration when developing novel therapeutic strategies.