ABSTRACT
@#持续分裂和增殖是肿瘤细胞的显著特征，为维持这一特征，肿瘤细胞的代谢发生一系列变化，包括从氧化磷酸化向有 氧糖酵解转变。异柠檬酸脱氢酶（isocitrate dehydrogenase, IDH）是胞质中重要的代谢酶，除催化异柠檬酸氧化脱羧生成α-KG、 产 生NADPH外，还可间接调节氨基酸和脂类代谢，参与氧化应激反应等。现在越来越多的研究发现，IDH1的表达及活性在某些肿 瘤组织中发生了改变，与肿瘤的发生发展过程密切相关。本文综述了IDH1的结构和功能，从其在肿瘤中的活性、如何参与调节 氧化应激反应、突变体及与肿瘤发生相关的信号通路（HIF-1α、AKT-mTOR）等方面对IDH1在肿瘤发生发展过程中的作用进行了 阐述，并对其调控机制进行了概况总结。作为可能的肿瘤治疗新靶点，IDH1在肿瘤发生发展中的机制研究及可能的靶向性药物 的发现将是今后研究的重点。
ABSTRACT
To find a credible nutritional screening tool for evaluating relationship between nutritional status and diseases in Chengdu female residents, the reliability and validity of a revised semi-quantitative food frequency questionnaire (SQFFQ) were tested. The validity was assessed by comparing the SQFFQ with the ‘standard’ method of 3 days’ dietary recall, and the reliability was assessed by comparing the first SQFFQ with the second SQFFQ at 4 weeks interval. Correlation analysis showed that, for reliability, the average correlation coefficient (CC) of 22 kinds of nutrients was 0.66 and reduced to 0.60 after adjusting for energy; the average of intra-class correlation coefficients (ICC) was 0.65. For validity, the average CC was 0.35 and remained stable after adjusting for CC of energy or nutrients. Validity of 17 nutrients in SQFFQ survey had correlation with result of 3 days’ dietary recall. The results showed that the revised SQFFQ can be used for investigating the role of nutrients in development of disease in Chengdu female residents.
ABSTRACT
Avian leukosis virus subgroup J (ALV-J) is a new type of virus that mainly induces myeloid leukosis (ML) in chickens. To further elucidate the pathogenesis of ALV-J infection and tumor development, expression profiles from the bone marrow tissue of 15 infected and 18 non-infected birds from a local-breed poultry-farm under naturally infected conditions, were analyzed by suppression-subtractive hybridization. The birds were diagnosed as ML+ (or ML-) by specific ALV-J detection methods, involving serological tests for antigens and antibodies, and RT-PCR to detect viral RNA. A total of 59 partial gene sequences were revealed by differential screening of 496 forward and 384 reverse subtracted cDNA clones. Of these, 22 identified genes, including 8 up-regulated and 14 down-regulated, were related to immune functions, these genes being, MHC B-G antigen, translationally-controlled tumor protein (TPT1/TPTC), transferrin and ferritin, hemoglobin and Carbonic anhydrase. Four of the down-regulated genes were selected for further analysis, in view of their predicted roles in infection and immunity by real-time qRT-PCR, using RNA collected from the same birds as those used for SSH. The four genes were expressed at significantly lower levels (p < 0.001) in ALV-J infected birds than in non-infected ones.