排序方式: 共有7条查询结果,搜索用时 0 毫秒
1
1.
Sudhakar Baluchamy Prabakaran Ravichandran Adaikkappan Periyakaruppan Vani Ramesh Joseph C. Hall Ye Zhang Olufisayo Jejelowo Daila S. Gridley Honglu Wu Govindarajan T. Ramesh 《The Journal of biological chemistry》2010,285(32):24769-24774
Radiation affects several cellular and molecular processes, including double
strand breakage and modifications of sugar moieties and bases. In outer space,
protons are the primary radiation source that poses a range of potential health
risks to astronauts. On the other hand, the use of proton irradiation for tumor
radiation therapy is increasing, as it largely spares healthy tissues while
killing tumor tissues. Although radiation-related research has been conducted
extensively, the molecular toxicology and cellular mechanisms affected by proton
irradiation remain poorly understood. Therefore, in this study, we irradiated
rat lung epithelial cells with different doses of protons and investigated their
effects on cell proliferation and death. Our data show an inhibition of cell
proliferation in proton-irradiated cells with a significant dose-dependent
activation and repression of reactive oxygen species and antioxidants
glutathione and superoxide dismutase, respectively, compared with control cells.
In addition, the activities of apoptosis-related genes such as caspase-3 and -8
were induced in a dose-dependent manner with corresponding increased levels of
DNA fragmentation in proton-irradiated cells compared with control cells.
Together, our results show that proton irradiation alters oxidant and
antioxidant levels in cells to activate the apoptotic pathway for cell
death. 相似文献
2.
Prabakaran Ravichandran Adaikkappan Periyakaruppan Bindu Sadanandan Vani Ramesh Joseph C. Hall Olufisayo Jejelowo Govindarajan T. Ramesh 《Journal of biochemical and molecular toxicology》2009,23(5):333-344
Carbon nanotubes (CNTs), the most promising material with unique characteristics, find its application in different fields ranging from composite materials to medicine and from electronics to energy storage. However, little is known about the mechanism behind the interaction of these particles with cells and their toxicity. So, here we investigated the adverse effects of multiwalled CNTs (MWCNTs) in rat lung epithelial (LE) cells. The results showed that the incubation of LE cells with 0.5–10 μg/mL of MWCNTs caused a dose‐ and time‐dependent increase in the formation of free radicals, the accumulation of peroxidative products, the loss of cell viability, and antioxidant depletion. The significant amount of incorporation of dUTPs in the nucleus after 24 h confirms the induction of apoptosis. It was also observed that there is an increase in the activity of both caspases‐3 and caspase‐8 in cells, with increases in time and the concentration of MWCNTs. No significant incorporation of dUTPs was observed in cells, incubated with z‐VAD‐fmk , which confirmed the role of caspases in DNA fragmentation. The present study reveals that MWCNTs induced oxidative stress and stimulated apoptosis signaling pathway through caspase activation in rat LE cell lines. © 2009 Wiley Periodicals, Inc. J Biochem Mol Toxicol 23:333–344, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/jbt.20296 相似文献
3.
We report ricin detection using antibody and aptamer probes immobilized on a nanoelectrode array (NEA) consisting of vertically aligned carbon nanofibers (VACNFs). These biosensor chips are fabricated on a wafer scale using steps common in integrated circuit manufacturing. Electrochemical impedance spectroscopy is used to characterize the detection event and the results indicate that the electron transfer resistance changes significantly after the ricin protein binds to the probe. Further confirmation is obtained from evaluation of the electrode surface by atomic force microscopy which clearly shows a change in height from the bare electrode to the surface bound by the probe-protein. 相似文献
4.
5.
Thiruppathiraja C Kamatchiammal S Adaikkappan P Santhosh DJ Alagar M 《Analytical biochemistry》2011,(1):73-79
The present study was aimed at the development and evaluation of a DNA electrochemical biosensor for Mycobacterium sp. genomic DNA detection in a clinical specimen using a signal amplifier as dual-labeled AuNPs. The DNA electrochemical biosensors were fabricated using a sandwich detection strategy involving two kinds of DNA probes specific to Mycobacterium sp. genomic DNA. The probes of enzyme ALP and the detector probe both conjugated on the AuNPs and subsequently hybridized with target DNA immobilized in a SAM/ITO electrode followed by characterization with CV, EIS, and DPV analysis using the electroactive species para-nitrophenol generated by ALP through hydrolysis of para-nitrophenol phosphate. The effect of enhanced sensitivity was obtained due to the AuNPs carrying numerous ALPs per hybridization and a detection limit of 1.25 ng/ml genomic DNA was determined under optimized conditions. The dual-labeled AuNP-facilitated electrochemical sensor was also evaluated by clinical sputum samples, showing a higher sensitivity and specificity and the outcome was in agreement with the PCR analysis. In conclusion, the developed electrochemical sensor demonstrated unique sensitivity and specificity for both genomic DNA and sputum samples and can be employed as a regular diagnostics tool for Mycobacterium sp. monitoring in clinical samples. 相似文献
6.
Thiruppathiraja C Kamatchiammal S Adaikkappan P Alagar M 《Biosensors & bioelectronics》2011,26(11):4624-4627
The zoonotic protozoan parasite Cryptosporidium parvum poses a significant risk to public health. Due to the low infectious dose of C. parvum, remarkably sensitive detection methods are required for water and food industries analysis. However PCR affirmed sensing method of the causative nucleic acid has numerous advantages, still criterion demands for simple techniques and expertise understanding to extinguish its routine use. In contrast, protein based immuno detecting techniques are simpler to perform by a commoner, but lack of sensitivity due to inadequate signal amplification. In this paper, we focused on the development of a mere sensitive immuno detection method by coupling anti-cyst antibody and alkaline phosphatase on gold nanoparticle for C. parvum is described. Outcome of the sensitivity in an immuno-dot blot assay detection is enhanced by 500 fold (using conventional method) and visually be able to detect up to 10 oocysts/mL with minimal processing period. Techniques reported in this paper substantiate the convenience of immuno-dot blot assay for the routine screening of C. parvum in water/environmental examines and most importantly, demonstrates the potential of a prototype development of simple and inexpensive diagnostic technique. 相似文献
7.
1