血管形成素-1重组腺病毒对兔实验性心肌梗死治疗作用的研究

目的　研究心肌内直接注射血管形成素 1(Ang 1)重组腺病毒促进血管生长的作用及对心肌梗死范围的影响。方法　用硝基四氮唑蓝大体标本染色观测血管形成素 1对高位双重结扎兔冠状动脉前降支后造成的急性心肌梗死范围的影响 ,并用免疫组化方法观察了血管生长情况。 48只雄性新西兰白兔随机分为实验组、单纯培养基 (DMEM)组与半乳糖苷酶Z(LacZ)重组腺病毒组 ,分别于冠状动脉结扎后心肌内直接注射血管形成素 1重组腺病毒 ,DMEM与LacZ重组腺病毒。第 14天与第 2 8天各组分别处死 8只 ,以观测心肌梗死与及血管新生情况。结果　在结扎冠状动脉前降支后 14天 ,实验组与对照组梗死心肌范围及新生毛细血管数目均无明显差异 ,术后 2 8天的结果显示实验组心肌梗死范围显著小于对照组 ,而新生毛细血管密度明显高于对照组 (P <0 0 1)。结论　血管形成素 1能促进兔实验性心肌梗死区新生血管形成 ,减轻心肌梗死程度     

Hedgehog signaling in gastrointestinal carcinogenesis and the gastrointestinal tumor microenvironment

The Hedgehog (HH) signaling pathway plays important roles in gastrointestinal carcinogenesis and the gastrointestinal tumor microenvironment (TME). Aberrant HH signaling activation may accelerate the growth of gastrointestinal tumors and lead to tumor immune tolerance and drug resistance. The interaction between HH signaling and the TME is intimately involved in these processes, for example, tumor growth, tumor immune tolerance, inflammation, and drug resistance. Evidence indicates that inflammatory factors in the TME, such as interleukin 6 (IL-6) and interferon-γ (IFN-γ), macrophages, and T cell-dependent immune responses, play a vital role in tumor growth by affecting the HH signaling pathway. Moreover, inhibition of proliferating cancer-associated fibroblasts (CAFs) and inflammatory factors can normalize the TME by suppressing HH signaling. Furthermore, aberrant HH signaling activation is favorable to both the proliferation of cancer stem cells (CSCs) and the drug resistance of gastrointestinal tumors. This review discusses the current understanding of the role and mechanism of aberrant HH signaling activation in gastrointestinal carcinogenesis, the gastrointestinal TME, tumor immune tolerance and drug resistance and highlights the underlying therapeutic opportunities.Key words: Hedgehog, Carcinogenesis, Tumor microenvironment, Gastrointestinal cancer, Cancer stem cells, Drug resistance     

商科类大学新生大学生人格健康量表（UPI）和艾森克人格问卷（EPQ）评定结果分析

目的了解高校商科专业大学新生的心理健康状况，有针对性地提出干预对策。方法采用UPI量表和艾森克人格问卷（EPQ）集体施测2008级商科专业5623名新生。结果UPI量表评定为第一类的学生占15.31%，有自杀意念学生占1.76%，男生的心理健康水平高于女生；EPQ问卷评定结果，商科专业新生在EPQ4个分量表上得分与常模差异显著；UPI归为第一类的学生在EPQ4个分量表上得分与非一类学生差异显著；UPI评定为有自杀意念学生在EPQ4个分量表上得分与无自杀意念学生差异显著。结论高校应加强大学新生入学教育工作的实效性，及早进行职业生涯规划教育，并根据不同性别开展有针对性的教育。     

beta1-integrin mediates myelin-associated glycoprotein signaling in neuronal growth cones

Several myelin-associated factors that inhibit axon growth of mature neurons, including Nogo66, myelin-associated glycoprotein (MAG) and oligodendrocyte myelin glycoprotein (OMgp), can associate with a common GPI-linked protein Nogo-66 receptor (NgR). Accumulating evidence suggests that myelin inhibitors also signal through unknown NgR-independent mechanisms. Here we show that MAG, a RGD tri-peptide containing protein, forms a complex with β1-integrin to mediate axonal growth cone turning responses of several neuronal types. Mutations that alter the RGD motif in MAG or inhibition of β1-integrin function, but not removal of NgRs, abolish these MAG-dependent events. In contrast, OMgp-induced repulsion is not affected by inhibition of b1-integrin function. We further show that MAG stimulates tyrosine phosphorylation of focal adhesion kinase (FAK), which in turn is required for MAG-induced growth cone turning. These studies identify β1-integrin as a specific mediator for MAG in growth cone turning responses, acting through FAK activation.     

A Case of Extensive Pityriasis Alba

Pityriasis alba (PA) is a common benign disease, characterized by hypopigmented macules or patches on the face, usually seen in children. However, two uncommon variants exist, a pigmenting type and an extensive type. Extensive PA is rare. The lesions tend to be less scaly, more persistent, more generalized, more symmetrical, and more frequently seen over the trunk and less so over the face. We report a child who had extensive PA lesions.     

Permanent third-degree atrioventricular block as clinical presentation of an intracardiac bronchogenic cyst.

Bronchogenic cysts are the most common primary cysts in the mediastinum. However, intracardiac bronchogenic cysts are uncommon. The present case represents a unique situation, in which an intracardiac bronchogenic cyst at the region of the atrioventricular node presented as permanent complete atrioventricular block (AVB) and was associated with the presence of an ostium secundum atrial septal defect.