p70 ribosomal protein S6 kinase (p70S6K), an important member of AGC family, is a kind of multifunctional Ser/Thr kinases, which plays an important role in mTOR signaling cascade. The p70 ribosomal protein S6 kinase is closely associated with diverse cellular processes such as protein synthesis, mRNA processing, glucose homeostasis, cell growth and apoptosis. Recent studies have highlighted the important role of S6K in cancer, which arose interests of scientific researchers for the design and discovery of anti-cancer agents. Herein, the mechanisms of S6K and available inhibitors are reviewed.
Antineoplastic Agents ; Humans ; Protein Kinase Inhibitors ; chemistry ; Ribosomal Protein S6 Kinases, 70-kDa ; antagonists & inhibitors ; metabolism ; Signal Transduction ; TOR Serine-Threonine Kinases

Humans ; Hyperphosphatemia ; diagnosis ; drug therapy ; Kidney Failure, Chronic ; diagnosis ; therapy ; Medicine, Chinese Traditional ; methods ; Phytotherapy ; methods

Objective To evaluate Cica-Beta Test kit for detection of metallo-β-lactamase-producing Pseudomonas aeruginosa (PAE)in the clinical microbiology laboratory.Methods A total of 82 imipenem-resistant PAE clinical isolates from litera-ture[5]was dectected to metallo-β-lactamase (MBLs)by PAE-MHT and Cica-Beta Test kit.Results The sensitivity,speci-ficity and accuracy rate of PAE-MHT was 84.6%,97.2% and 97.6%,and the sensitivity,specificity and accuracy rate of Cica-Beta Test kit was 76.9%,100% and 96.3%,respectively.Two methods had a good consistency.Conclusion Two methods are simple,quick for detecting to metallo-β-lactamase-producing Pseudomonas in clinical laboratories.

The transesterification reaction conditions of lard with methyl acetate with combined use of immobilized lipases as catalysts were conducted. Initially, according to single factorial experiments, the studies on Lipozyme TL IM and Novozym 435 respectively catalyzed transesterification of lard showed that the optimal parameters of transesterification reaction were: the molar ratio of methyl acetate to oil of 14∶1, 40% enzyme added based on oil weight, temperature 50℃. Combined use of Lipozyme TL IM and Novozym 435 was proposed further to improve the catalytic performance by the response surface method (RSM). Herein, a 5-level-3-factor central composite rotated design was employed to evaluate the effects of lipase loading, the proportion of the two lipases and amount of methyl acetate. The optimum conditions were as followings: 40% lipase loading based on oil weight, 50%/50% the proportion of lipases (Novozym 435/Lipozyme TL IM), and the molar ratio of methyl acetate to oil of 14∶1. And under the optimal conditions, the highest biodiesel yield of 97.6% could be attained, which was higher than the biodiesel yield with each single one of the two lipases. The results suggested that the technics of combined use of certain immobilized lipases catalyzed transesterification reaction of lard for biodiesel production with methyl acetate as the acyl acceptor could raise the FAME yield and save the production cost.

· AIM: To explore the relationship between the expression of Fas/FasL and the apoptosis in retinal ischemia/reperfusion injury of rats, as well as the therapeutic effects of basic fibroblast growth factor (bFGF)on the ischemic retina.injury were made by transiently elevating introcular pressure. A total of 28 rats were divided into Normal Group and Operative Group. The latter were subdivided into 1, 6, 12, 24, 48 and 72h after reperfusion, in which the left eyes of the rats were in the ischemia/reperfusion groups and the right ones were in the treatment groups (bFGF intracameral injection). Apoptosis was assessed by the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labelling (TUNEL) method, and theexpression of Fas/FasL ligand was studied by strept avidin-biotin complex (SABC) immunohistochemistry.mai rats' retinae, but there were a significant number of TUNEL positive cells in 6-24h after transient ischemia followed by a decrease at 48h. The number of TUNEL positive cells reached a maximum at 24h after ischemia.The expression of Fas gradually increased as early as at 6h, reached a peak at 24h, then decreased at 48h. Similarly, the expression of Fas ligand was at peak in 24-48h in GCL and INL of retina. bFGF ministered before reperfusion inhibited apoptotsis and ameliorated the tissue damage. It also diminished Fas and FasL expression in ischemic/reperfused retina.siently elevated IOP induced apoptosis of cells in the retina. Fas/FasL may have an important role in the early events of the apoptotic pathways. bFGF can rescue RGCs from retinal ischemia/reperfusion injury through down-regulation of Fas and Fas ligand expression and may represent an important mechanism for therapeutic neuroprotection.

Objective To investigate the effect of aluminum on hair loss induc ed by fluoride in fluorosis mice.Methods Sixty male C57BL mice were divided into four groups according to body mass:control group,fluoride (F) group (F-100 mg/L),aluminum(Al) group(Al3+ 270 mg/L) and F + Al group(F-100 mg/L + Al3+270 mg/L).Mice were killed 1 month and 3 months after the experiment,respectively.Bone F content was detected by ion-selective electrode method.The level of bone Al was measured through inductively coupled plasma emission spectrum.Dental fluorosis and hair loss of mice were evaluated by visual method.Results One month after the experiment,no dental fluorosis and hair loss was found in all four groups.The content of bone F was the highest in F group [(2401.649 + 86.835) mg/kg],and the lowest in A1 group [(427.006 + 11.878) mg/kg].The levels of bone F in F + Al group and control group were (1210.332 + 19.531)mg/kg and (538.001 + 33.337)mg/kg,respectively.The difference was statistically significant between any two groups (all P ＜ 0.05).Three month after the experiment,all mice of F treatment group had dental fluorosis and hair loss(10/10).Alopecia areas were found in the neck and back regions only.There was no hair loss in control group,Al group and F + Al group.No dental fluorosis was found in both control and Al groups.Only 2 mice were found with dental fluorosis in F + Al group.The levels of bone F in F group,F + Al group,control group and Al group were (4098.645 + 58.842),(1888.165 ± 12.187),(876.258 + 14.462) and (662.385 ± 8.966) mg/kg,respectively.The difference was statistically significant between any two groups (all P ＜ 0.05).Conclusions The hair loss is found in fluorosis mice.Hair loss of mice is closely associated with the level of F exposure.Al can prevent the occurrence of hair loss induced by F in mice through reducing the accumulation of F.

Nucleic acid sequence-based amplification(NASBA) is a sensitive,isothermal,transcription-based amplification system specifically designed for the detection of RNA targets,which could amplify templete RNA in 2h under isothermal condition at about 42?C and without any special equipment.NASBA is now widely applicated in diagnosis of many pathogenic microorganism.It is mainly about principles and applications of NASBA in viral diagnosis.

Adult ; Air Pollutants, Occupational ; adverse effects ; Chemical Industry ; Female ; Humans ; Insecticides ; adverse effects ; Male ; Maximum Allowable Concentration ; Middle Aged ; Occupational Diseases ; chemically induced ; diagnosis ; Organothiophosphorus Compounds ; adverse effects ; Phosphorus Compounds ; adverse effects ; Sulfides ; adverse effects

Objective To establish an HPLC method for determination of related substances of dexmethylphenidate hydrochloride and their content .Methods The HPLC method was used on an Agilent ZORBAX SB-C18 column with a mo-bile phase of methanol-0.2%triethyl citrate in 25 mmol/L potassium dihydrogen phosphate ( pH was adjusted to 3.5 with phosphoric acid) (35∶65) at a flow rate of 1.0 ml/min.The detection wavelength was 209 nm and column temperature was 40℃.Results Under the selected chromatographic condition , dexmethylphenidate hydrochloride was completely separated from impurity.The limit of detection was 81.12 ng/ml.The calibration curve was linear in the range of 2-30 μg/ml ( r=0.9995).The average recovery of the method was 100.83%, and the stability of the working solution was acceptable in 12 h(RSD=0.10%).Conclusion This method is simple,specific,accurate and suitable for analyzing the related substances and their content in dexmethylphenidate hydrochloride .

Objective To explore the CT features of infantile hepatic hemangioendothelioma (IHH).Methods CT imaging features of 16 IHH patients confirmed by surgical pathology and clinical diagnosis were retrospectively reviewed.Results Of 16 patients,there were single lesion in 10 cases and multiple lesions in 6 cases.All the lesions were rich in blood supply,and the arterial phase showed obviously rings enhanced.Some linear enhancement towards to the center below the annular enhancement of solitary lesions were found.There were patchy enhancement in annular enhancement center area,and the area of enhancement obvious increasing in venous phase and delayed phase in 4 cases with multiple lesions,enhancement mode was similar to single lesion in 1 case with multiple lesions.The lesions of IHH Ⅱ were small and multiple,and showed intermittent line shaped edge enhancement;some lesions below the linear enhancement showed small nodular enhancement and the area of nodular enhancement enlarged in venous phase,the range of linear enhancement was not obvious.Conclusion CT manifestations of IHH have some characteristics,and the enhancement of CT is more important in the diagnosis of this disease.