Malignant gliomas are highly invasive tumors that 1use the cerebral vessels for invasion due to high vascular fragility of the blood--brain barrier(BBB).On one hand,glioma is characterized by the BBB disruption,on the...Malignant gliomas are highly invasive tumors that 1use the cerebral vessels for invasion due to high vascular fragility of the blood--brain barrier(BBB).On one hand,glioma is characterized by the BBB disruption,on the other hand,drug brain delivery via the BBB is a big challenge in glioma therapy.The limited information about vascular changes associated with glioma growth is a reason of slow progress in prevention of glioma development.Here,we present in vrivo and er vrivo study of the BBB disruption and glioma cells(GCs)migration in rats using fuorescence and confocal microscopy.We uncovered a local breach in the BBB in the main tumor mass but not within the border of normal and malignant cells,where the BBB was impermeable for high weight molecules.The migr ation of GCs were observed via the cerebral vessels with the intact BBB that was associated with macrophages infiltration.The mechanisms underlying glioma progression remain umknown but there is an evidence that the sympathetic nervous system(SNS)via activation of vascular beta2-adrenoreceptors(B2-ADRs)can play an important role in tumor metastasis.Our results clearly show an increase in the expression of vascular B2-ADRs and production of the beta arrestin-1-co-factor of B2-ADRs signaling pathway in rats with glioma.Pharmacological blockade of B2-ADRs reduces the BBB disruption,macrophages infiltration,GCs migration and increases survival rate.These data suggest that the blockade of B2-ADRs may be a novel adjuvant therapeutic strategy to reduce glioma progression and prevent metastasis。展开更多
PANI （polyaniline） as a promising conducting polymer and photosensitizer has been used to prepare PANI/TiO2 （polyaniline/TiO2） nanocomposite as photocatalyst. TiO2 nanoparticles with size of 5-100 nm were encapsul...PANI （polyaniline） as a promising conducting polymer and photosensitizer has been used to prepare PANI/TiO2 （polyaniline/TiO2） nanocomposite as photocatalyst. TiO2 nanoparticles with size of 5-100 nm were encapsulated by PANI via the ＂in situ＂ polymerization of aniline on the surface of TiO2 nanoparticles. IR, SEM, EPR techniques were used to characterize the mechanism of electron interaction in PANI/TiO2 nanocomposite. The resulting PANI-modified TiO2 composites exhibit significantly higher photocatalytic activity than that of neat PANI on degradation of MB （methylen blue） aqueous solution under UV irradiation.展开更多
基金Grant of Russian Science Foundation No.17-75-20069.
文摘Malignant gliomas are highly invasive tumors that 1use the cerebral vessels for invasion due to high vascular fragility of the blood--brain barrier(BBB).On one hand,glioma is characterized by the BBB disruption,on the other hand,drug brain delivery via the BBB is a big challenge in glioma therapy.The limited information about vascular changes associated with glioma growth is a reason of slow progress in prevention of glioma development.Here,we present in vrivo and er vrivo study of the BBB disruption and glioma cells(GCs)migration in rats using fuorescence and confocal microscopy.We uncovered a local breach in the BBB in the main tumor mass but not within the border of normal and malignant cells,where the BBB was impermeable for high weight molecules.The migr ation of GCs were observed via the cerebral vessels with the intact BBB that was associated with macrophages infiltration.The mechanisms underlying glioma progression remain umknown but there is an evidence that the sympathetic nervous system(SNS)via activation of vascular beta2-adrenoreceptors(B2-ADRs)can play an important role in tumor metastasis.Our results clearly show an increase in the expression of vascular B2-ADRs and production of the beta arrestin-1-co-factor of B2-ADRs signaling pathway in rats with glioma.Pharmacological blockade of B2-ADRs reduces the BBB disruption,macrophages infiltration,GCs migration and increases survival rate.These data suggest that the blockade of B2-ADRs may be a novel adjuvant therapeutic strategy to reduce glioma progression and prevent metastasis。
文摘PANI （polyaniline） as a promising conducting polymer and photosensitizer has been used to prepare PANI/TiO2 （polyaniline/TiO2） nanocomposite as photocatalyst. TiO2 nanoparticles with size of 5-100 nm were encapsulated by PANI via the ＂in situ＂ polymerization of aniline on the surface of TiO2 nanoparticles. IR, SEM, EPR techniques were used to characterize the mechanism of electron interaction in PANI/TiO2 nanocomposite. The resulting PANI-modified TiO2 composites exhibit significantly higher photocatalytic activity than that of neat PANI on degradation of MB （methylen blue） aqueous solution under UV irradiation.
