摘要 :
A synergistic action among hydrogen, stress and corrosion medium on austenitic stainlesssteel has been investigated. The results show that both hydrogen and stress would increase thecorrosion rate and the effects of hydrogen and s...
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A synergistic action among hydrogen, stress and corrosion medium on austenitic stainlesssteel has been investigated. The results show that both hydrogen and stress would increase thecorrosion rate and the effects of hydrogen and stress on the corrosion rate are synergistic ratherthan simple additive. Hydrogen decreases the threshold stress and delays fracture time of stresscorrosion cracking in a boiling MgCl2 solution by a factor of 1/5 and 10, respectively.
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AIM: To investigate synergism of inhibition of telomerase activity and proliferation of human colon cancer cells by combination of telomerase antisense oligonucleotides (ASODNs) simultaneously targeting human telomerase RNA (hTR) ...
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AIM: To investigate synergism of inhibition of telomerase activity and proliferation of human colon cancer cells by combination of telomerase antisense oligonucleotides (ASODNs) simultaneously targeting human telomerase RNA (hTR) and human telomerase reverse transcriptase (hTERT)in vitro.METHODS: ASODN of hTR and ASODN of hTERT were transfected into human colon cancer SW480 cells by liposomal transfection reagents. Telomerase activity of SW480 cells was examined using telomeric repeat amplification protocol (TRAP)-enzyme-linked immunosorbent assay (PCR-ELISA). Proliferation activity of SW480 cells was tested by methyl thiazolyl tetrazolium assay. Apoptosis and cell cycle were analyzed by flow cytometry.RESULTS: The telomerase activity and cell survival rate in SW480 cells transfected with 0.2 μmol/L of ASODN of hTR or ASODN of hTERT for 24-72 h were significantly decreased in a time-dependent manner compared with those after treatment with sense oligonucleotides and untreated (telomerase activity: 24 h, 73%, 74% vs 99%,98%; 48 h, 61%, 55% vs 98%, 99%; 72 h, 41%, 37% vs 99%, 97%; P＜0.01; cell survival rate: 24 h, 88%, 86%vs94%, 98%; 48 h, 49%, 47% vs94%, 97%; 72 h, 44%,42% vs 92%, 96%; P＜0.01). Moreover, the telomerase activity and the cell survival rate in SW480 cells treated by the combination of telomerase anti-hTR and anti-hTERT were more significantly suppressed than single anti-hTR or anti-hTERT (telomerase activity: 24 h, 59% vs 73%,74%; 48 h, 43% vs61%, 55%; 72 h, 18% vs41%, 37%;P＜0.01; cell survival rate: 24 h, 64% vs88%, 86%; 48 h,37% vs49%, 47%; 72 h, 25% vs44%, 42%; P＜0.01).Meanwhile, the apoptosis rates in the combination group were markedly increased compared with those in the single group (24 h, 18.0% vs 7.2%, 7.4%; 48 h, 23.0%vs 13.0%, 14.0%; 72 h, 28.6% vs13.2%, 13.75; P＜0.01).Cells in combination group were arrested at G0/G1 phase.CONCLUSION: Telomerase anti-hRT and anti-hTERT suppress telomerase activity, and inhibit growth of human colon cancer cells probably via induction of apoptosis and retardation of cell cycle. Additionally, combined use of telomerase ASODNs targeting both hTR and hTERT yields synergistic action selective for human colon cancer.
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In recent years,magnetic nanoparticles(MNPs)have received great attention within the field of biomedicine,especially for cancer therapy.This is because MNPs have many excellent physical and chemical properties to provide sufficien...
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In recent years,magnetic nanoparticles(MNPs)have received great attention within the field of biomedicine,especially for cancer therapy.This is because MNPs have many excellent physical and chemical properties to provide sufficient imaging information along with satisfactory therapeutic efficacy.Moreover,by virtue of various modification strategies,the obtained multifunctional MNPs can further achieve synergized multimodal cancer theranostic,which is worthy of further study.In this review,we summarize the recent developments in imaging-guided strategies and synergistic cancer therapy based on multifunctional MNPs.Then,we discuss the challenge and perspective of the next generation of MNPs-based imaging-guided cancer therapy,hoping to provide guidance in potential applications.
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