Defective expression of polarity protein Par3 promotes cervical tumorigenesis and metastasis

OBJECTIVES

The aim of this study was to investigate whether the partition-defective 3 protein (Par3) regulates cervical carcinoma growth and metastasis.

MATERIALS AND METHODS

Immunohistochemistry (IHC) was used to analyze the expression of Par3 protein in samples from 89 cervical squamous cell carcinoma (CSCC) patients among Uyghur women. The specific short hairpin (shRNA) vector as well as eu- karyotic expression vector of PARD3 was transfected into SiHa cell lines. The variation of migration and invasion after transfection was determined using Transwell assays, cell cycle, and apoptosis were assayed by flow cytometry, respectively.

RESULTS

The incidence of CSCC was associated with reduced expression of Par3. Downregulation of Par3 was significantly associated with more advanced tumors (i.e., higher histological grade, lymph node involvement, and higher tumor stages) (p < 0.05 for all). Lost expression of Par3 promotes prolif- eration, inhibits apoptosis, and enhances migration and invasion. Loss of Par3 induces MMP9 expression and epithelial to mesenchymal transition (EMT) related genes (N-cadherin, E-cadherin, and β-catenin) expression changed in SiHa cells.

CONCLUSIONS

The reduced Par3 expression in cervical cancer indicates tumor-suppressive properties of Par3 that may be a marker of poor prognosis in cervical cancer patients, and the molecular determinants of epithelial polarity which have tumorigenesis enhancing impact, might through EMT.

A novel TiO2 nanostructure as photoanode for highly efficient CdSe quantum dot-sensitized solar cells

For sensitized solar cells, photoanodes combining the advantages of TiO₂ nanoparticles (high specific surface area) and one-dimensional (1D) nanostructures (fast transport channels) are ideal for obtaining highly efficient sensitized solar cells.

Realization of a fast-response flexible ultraviolet photodetector employing a metal–semiconductor–metal structure InGaZnO photodiode

A flexible UV photodetector (PD) has been fabricated based on the amorphous InGaZnO film. It shows good photoresponse characteristics before and after bending, and fast response speed compared with the most reported flexible UV PDs.

Tracking reliability for space cabin-borne equipment in development by Crow model

Objective. To study and track the reliability growth of manned spaceflight cabin-borne equipment in the course of its development. Method. A new technique of reliability growth estimation and prediction, which is composed of the Crow model and test data conversion (TDC) method was used. Result. The estimation and prediction value of the reliability growth conformed to its expectations. Conclusion. The method could dynamically estimate and predict the reliability of the equipment by making full use of various test information in the course of its development. It offered not only a possibility of tracking the equipment reliability growth, but also the reference for quality control in manned spaceflight cabin-borne equipment design and development process.

[Temperature environment and the heat exchange of astronaut in the emergency landing areas]

OBJECTIVE

To analyze the temperature environment of different emergency landing areas and discuss the heat exchange between astronaut and the temperature environment. In addition, countermeasures against the emergency temperature environment were discussed.

METHOD

Heat exchange equation between man and environment was built using the law of energy conservation, and factors that affect the heat balance of human body were discussed.

RESULT

It was found that temperature, humidity, air pressure, velocity of wind and solar radiation are factors affecting the thermal balance of the astronaut.

CONCLUSION

It is important for an astronaut to act properly and use the living devices and the environment conditions correctly during the emergency landing.