ABSTRACT
Objective To explore the association between maternal methylene tetrahydrofolate reductase (MTHFR) C677T polymorphism and neural tube defects (NTDs). Methods CBM, VIP, CNKI, Wanfang, PubMed and Web of Science databases from set up to March, 2014 were electronically searched to identify case-control studies on the relationship between maternal MTHFR C677T polymorphism and NTDs. The data were quantitatively analyzed by RevMan 5.0 software. Results A total of 25 studies were selected including 2 282 cases and 3 420 controls. Overall, the pooled OR (with 95%CI) under co-dominant model and allele contrast were 2.28(1.60-3.24), 1.25(1.02-1.53) and 1.42(1.21-1.67). Subgroup analysis showed significant association between maternal MTHFR C677T polymorphism and NTDs susceptibility in Asian populations. Conclusion The present meta-analysis suggests that MTHFR C677T polymorphism is significantly associated with maternal risk for NTDs, especially in Asian populations.
ABSTRACT
BACKGROUND:Microcapsules is one of the main directions of targeted therapeutic dosing system. With a size of several microns to several hundred microns, it can be used for injection, oral, arterial administration and local treatment of targeted organs and other treatment approaches. OBJECTIVE: To prepare rhizoma drynariae total flavonoids/polylactic-co-glycolic acid microcapsules and optimize the preparation conditions. METHODS: The rhizoma drynariae total flavonoids/polylactic-co-glycolic acid microcapsules was prepared by ultrasonic emulsification. The effect of the mass concentration (60, 100, 140, 180 g/L), stirring speed (50, 1 000, 2 000, 4 000 r/minutes), colostrum emulsification time (2, 4, 6, 8 minutes), colostrum water oil ratio (1:5, 1:10, 1:15, 1:20) of rhizoma drynariae total flavonoids/polylactic-co-glycolic acid microcapsules on gross morphology, particle size distribution width and total flavonoids encapsulation efficiency of microcapsules was univariately analyzed. The rhizoma drynariae total flavonoids/polylactic-co-glycolic acid microcapsules with smaler particle size, uniform dispersion and higher encapsulation efficiency was filtered out. RESULTS AND CONCLUSION: The optimum process parameters were as folows: 140 g/L polylactic acid-glycolic acid solution, the stirring speed of 2 000 r/min, the colostrum emulsification time of 6 minutes, and the colostrum water-oil ratio of 1:15. The microcapsules prepared in the optimized process displayed a uniform distribution and its average particle size was (789.8±712.3) nm, which distributed relative narrowly and basicaly less than 5 μm. Microcapsules presented round, with a regular edge under scanning electron microscope. The average encapsulation efficiency was 47.72%.
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Objective: To construct an adenovirus vector encoding mouse PGC1? gene for further study on its function. Methods: Recombinant shuttle plasmid pAdTrack-CMV-PGC1? was linearized by PmeⅠ and transformed into Escherichia coli BJ5183 carrying backbone plasmid pAdeasy-1 to obtain adenovirus plasmid through homologous recombination. The recombinant adenovirus plasmid was digested by PacⅠ and transfected into HEK293 cells to form adenvirus particles. The virus titer was determined by TCID50 method. The expression of PGC1? in 293 cells was detected by Western blot. Results: The packaging cell showed typical CPE,and the virus titer was about 3?1010 TCID50/ml after amplification. The expression of PGC1? mediated by the recombinant adenovirus vector was verified by Western blot. Conclusion: The adenovirus vector encoding mouse PGC1? gene was successfully constructed,and the protein was observed in 293 cell.