PubMed · 6665882
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1983-11-28. [Interaction between disopyramide and pindolol].. https://pubmed.ncbi.nlm.nih.gov/6665882/
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2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is an environmental contaminant originating from industrial waste. At sublethal concentrations it induces anorexia and weight loss as part of the so-called wasting syndrome. To gain insight into its possible underlying mechanisms, mRNA expression of some key hypothalamic neuropeptides involved in the regulation of body weight was studied using in situ hybridization histochemistry in adult male Sprague-Dawley rats 6 days after single oral administration of TCDD (15 microg/kg) and in age-paired control rats. In TCDD-treated rats which displayed a decrease in body weight gain vs. controls, arcuate nucleus expression of neuropeptide Y (NPY), proopiomelanocortin (POMC) and cocaine- and amphetamine-regulated transcript (CART) mRNA was increased. In the lateral hypothalamic area, melanin-concentrating hormone (MCH) mRNA expression was also increased, while levels of CART and orexin/hypocretin mRNA were not significantly changed. Since TCDD is known to bind to the aryl hydrocarbon receptor (AhR), the distribution of the AhR repressor (AhRR), which is co-expressed with AhR in the same cells, was studied by immunohistochemistry in the mouse hypothalamus using mouse AhRR specific antiserum. AhRR immunoreactivity was present in the nuclei of neurons found in all main hypothalamic groups including NPY, CART, MCH and orexin/hypocretin neurons. Xenobiotic response elements were found in these neuropeptide genes with the exception of MCH. Thus changes in expression of orexigenic and anorexigenic neuropeptides after TCDD treatment may help to explain the occurrence of the TCDD-induced weight loss, which may be either directly or indirectly related to the effects of TCDD on neuropeptide expression.
A rapid, sensitive and accurate liquid chromatographic-tandem mass spectrometric method is described for the determination of tamsulosin in dog plasma. Tamsulosin was extracted from plasma using a mixture of hexane-ethyl acetate (2:1, v/v) and separated on a C18 column interfaced with a triple quadrupole tandem mass spectrometer. The mobile phase consisting of a mixture of methanol, water and formic acid (80:20:1, v/v/v) was delivered at a flow rate of 0.5 ml/min. Atmospheric pressure chemical ionization (APCI) source was operated in positive ion mode. Selected reaction monitoring (SRM) mode using the transitions of m/z 409-->m/z 228 and m/z 256-->m/z 166.9 were used to quantify tamsulosin and the internal standard, respectively. The linearity was obtained over the concentration range of 0.1-50.0 ng/ml for tamsulosin and the lower limit of quantitation was 0.1 ng/ml. For each level of QC samples, inter- and intra-run precision was less than 5.0 and 4.0% (relative standard deviation (R.S.D.)), respectively, and accuracy was within +/-0.3% (relative error (R.E.)). This method was successfully applied to pharmacokinetic study of a tamsulosin formulation product after oral administration to beagle dogs.
A rapid method was developed for the quantitative determination of the novel histone deacetylase inhibitor, MS-275, in human plasma. Calibration curves were constructed in the range of 1-100 ng/ml, and were analyzed using a weight factor proportional to the nominal concentration. Sample pretreatment involved a one-step protein precipitation with acetonitrile of 0.1 ml samples. The analysis was performed on a column (75 mm x 4.6 mm i.d.) packed with 3.5 microm Phenyl-SB material, using methanol-10mM ammonium formate (55:45 (v/v)) as the mobile phase. The column effluent was monitored by mass spectrometry with positive electrospray ionization. The values for precision and accuracy were always < or =5.58 and <11.4% relative error, respectively. The method was successfully applied to examine the pharmacokinetics of MS-275 in a cancer patient.