FLASH Binds p53 and Enhances its Transcriptional Activity / 中国生物化学与分子生物学报

As an important transcription factor, the tumor suppressor protein p53 is involved in multiple biological processes such as cell cycle regulation, cell division, cell senescence and DNA repair The functional roles of p53 under various physiological conditions are inseparable from the assistance of many cofactors, which can regulate the protein modification, cellular sub-localization, and protein stability of p53 Therefore, the identification of p53-binding protein(s) has important biological significance for further understanding the signal transduction network of p53 in vivo. In the present study, a novel p53-binding protein, FADD-like interleukin-1β-converting enzyme associated huge protein (FLASH) was identified through a yeast two-hybrid screen The protein-protein interaction and the structural basis of the interaction between FLASH and p53 was also confirmed by co-immunoprecipitation analysis These studies have shown that p53 can simultaneously interact with both FLASH-N1 (aa 1 ~ 200) and FLASH-C1 (aa 1 534 ~ 1 780) In addition, both of FLASH-N and FLASH-C can interact with the same region of p53 (aa 293 ~ 393) Transcription analysis has revealed that the full length of FLASH and FLASH-M (aa 921 ~ 1533) can enhance the transcription activity of p53 In summary, FLASH can bind to p53 and enhance its transcriptional activity

Correlation between Ultrasound-guided Diffuse Optical Tomography and Hypoxia-inducible Factor-1Α of Breast Cancer / 中国医学科学院学报

Objective To investigate the correlation between ultrasound-guided diffuse optical tomography (US-DOT) and hypoxia-inducible factor-1Α (HIF-1Α) of breast cancer. Methods Totally 69 patients with pathologically confirmed breast cancer underwent preoperative conventional breast ultrasonography examinations and US-DOT at Peking Union Medical College Hospital From October 2007 to February 2010 were enrolled in this study.After surgery,immunohistochemical staining of HIF-1Α and CD34 were performed,and the differences of total hemoglobin concentration (THC) and microvessel density (MVD) between HIF-1Α positive and negative groups were analyzed. Results HIF-1Α was positive in 12 cases (17.4%) and negative in 57 cases (82.6%). The average THC and MVD of HIF-1Α-positive cases were (274.763±77.661) Μmol/L and (33.8±10.8)/0.2 mm(2) respectively. The average THC and MVD of HIF-1Α-negative cases were (228.059±65.760)Μmol/L and (28.4±7.4)/0.2 mm(2). MVD(t=2.049,P=0.04) and THC(t=2.167,P=0.034) of HIF-1Α-positive group were significantly higher than those of HIF-1Α-negative group. Conclusions HIF-1Α can promote tumor angiogenesis and thus increase the blood supply and THC. As an indicator of tumor blood supply,THC can indirectly reflect the angiogenic activity of breast cancer.

Automated breast volume scanning in the diagnosis of breast intraductal papilloma / 中国医学科学院学报

<p><b>OBJECTIVE</b>To investigate the value of automated breast volume scanning (ABVS) in the diagnosis of breast intraductal papilloma (IDP).</p><p><b>METHODS</b>Totally 239 lesions in 213 women who were scheduled for open biopsy were investigated in this study. The patients underwent both ABVS and conventional ultrasound (US). According to the imaging diagnostic standards of IDP, the diagnostic accuracy for ABVS was calculated, and then compared with US, using histopathological examination as the gold standard.</p><p><b>RESULTS</b>Among the 239 breast lesions studied, 85 were pathologically proved to be malignancies and 154 benign lesions, among which there were 26 cases of IDP. ABVS found 41 cases of IDP (17.2%), with the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy being 88.5%, 91.5%, 56.1%, 98.5%, and 91.2%, respectively. In contrast, US found 32 cases of IDP (13.4%), with the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy being 73.1%, 93.9%, 59.4%, 96.6%, and 91.6%, respectively.</p><p><b>CONCLUSION</b>ABVS coronal images can better display the structures of dilated lactiferous ducts and the intraluminal echoes, increase the diagnostic accuracy of IDP, and thus provide more information for the diagnosis and differential diagnosis of IDP.</p>