PubMed · 11228627
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J L Gayton. 2001. Truth and consequences.. https://doi.org/10.1016/s0161-6420(00)00507-8
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Meloxicam was quantified in human plasma after a single 15 mg oral dose of the drug was given to 26 healthy volunteers. An Applied Biosystems Sciex API 2000 triple quadrupole mass spectrometer in multiple reaction monitoring (MRM) mode, using TurboIonSpray (TIS) in the positive ion mode, was used. Protein precipitation with acetonitrile was followed by C(18) reverse phase liquid chromatography and tandem mass spectrometry. The mean recovery for meloxicam was 92% with a lower limit of quantification of 8.96 ng/ml. Piroxicam was used as the internal standard. This assay method makes use of the increased sensitivity and selectivity of tandem mass spectrometry (MS-MS) detection to allow for a more rapid (extraction and chromatography) and selective method for the determination of meloxicam in human plasma than has previously been described.
The antitumor mechanisms mediated by combined treatment of aspirin and radiation on human cervical cancer cells are unclear. In this paper, we studied whether aspirin and radiation induced apoptosis and whether the sensitivity to radiation was enhanced in aspirin-pretreated HeLa TG, human cervical cancer cells. We identified the regulation of apoptosis-responsive genes, bcl-2, caspase-3 and p53 after combined treatment. To investigate the growth inhibitory effect on HeLa TG cells after treatment of various nonsteroidal anti-inflammatory drugs (NSAIDs), we performed cell proliferation assay and colony-forming assay. In the presence of aspirin, sulindac and indomethacin, cell proliferation and colony formation were decreased in a time- and dose-dependent manner. According to flow cytometry analysis and Hoechst 33342 staining, we found that aspirin increased sub-G1 population and nuclear condensation of cervical cancer cells. Remarkably, the combined treatment decreased cell proliferation compared with treatment of 1 mM aspirin or 6 Gy radiation alone. Pretreatment of aspirin followed by irradiation also elevated the population of apoptotic cells. These results revealed that sensitivity to radiation was enhanced in aspirin-pretreated HeLa TG cells, and aspirin has the additive role for amplifying the radiotherapeutic effect in cervical cancer cells. Finally, combined treatment revealed bcl-2 repression and caspase-3 induction did not detect any change but p53 expression did. We have demonstrated that combined treatment of aspirin and radiation induces the antitumor effect mediated by bcl-2 and caspase-3 pathway in cervical cancer cells.
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