Construction of tissue engineered cell sheet / 生物工程学报

Scaffold-free tissue engineered cell sheet is an emerging technology in biomedical field. It can avoid the adverse effects of scaffold materials, and can be further assembled to form more complex three-dimensional functional tissues. The construction of cell sheet is mainly based on the culture substrate composed of sensitive materials. By changing the stimulation factors such as temperature, enzyme, light, ion, redox, pH and sugar, the adhesion behavior of the substrate to the cells could be changed to make the cells detach naturally, thus generating the cell sheet. Recent years have seen the development of various simple and efficient construction technologies of cell sheet due to the development of a variety of novel sensitive culture substrates. The resulted cell sheets with excellent performance have greatly expanded their applications. This review summarized the construction methods of tissue engineered cell sheet and discussed the challenges and future perspectives in this field.

Study on the transcription profiling of biofilm formation by Candida albicans at different phases exposed to tyrosol and farnesol / 中华微生物学和免疫学杂志

Objective To investigate the effects of tyrosol and farnesol on the transcription profiling of C.albicans biofilm by microarray analysis.Methods The standard strain of C.albicans,SC5314 were cultured into four groups (tyrosol treated,farnesol treated,tyrosol and farnesol co-treated,and untreated control).The cell suspensions of SC5314 were prepared and dispensed into polystyrene flasks to form biofilm.Then,the biofilms were collected at 6 h and 24 h respectively after culturing.RNA samples were extracted and synthesized into cDNA through reverse transcription.The genome arrays were scanned with a confocal LuxScanTM scanner and the images were then analyzed by using LuxScanTM 3.0 software (both from CapitalBio).Bioinformatics analysis of the data was carried out by comparatively analyzing S.cerevisiae gene in KEGG gene database.Results The cDNA microarray data showed that tyrosol and farnesol regulated biofilm formation by regulating the genes associated with biofilm formation such as hypha genes and yeast genes.Tyrosol positively regulated gene expression of C.albicans biofilm,while farnesol played negative role.There were striking differences in gene expression patterns between tyrosol or farnesol treated groups and the control.Tyrosol had no antagonistic effect to farnesol.Bioinformatics analysis showed that the differential gene expression was involved in biological process,molecular function process and cell component formation.These genes regulated the C.albicans biofilm formation by encoding proteins involved in the biological metabolism.Conclusion Tyrosol and farnesol influenced the formation of C.albicans biofilm through regulating gene expression which showed differences at different phases of biofilm formation.