Studies have showed that lipophilic compounds Tanshinone I, Tanshinone IIA, Cryptotanshinone, and 15, 16dihydrotanshinone I had the ability to ameliorate memory decits induced by scopolamine, Tanshinone IIA and 2 Tanshinone IIB could bring about reduction of brain Letrozole infarct volume plus the restoration of neurological function in an experimental model of stroke in mice, Cryptotanshinone could enhance the cognitive skill in Alzheimers condition transgenic mice. Aside from, Tanshinone I, Tanshinone IIA, and Cryptotanshinone were also identified to become the substrates of P gp. Even so, it really is nonetheless unclear whether Danshensu, a hydrophilic compound in Danshen, has got the likely of crossing the BBB or is the substrate of P gp. The current study aims to research the position of P gp within the transportation of Danshensu across the BBB by observing Danshensu concentration in plasma and brain tissue in rats. Danshensu was obtained from Shandong Luye Pharmaceutical Co., Ltd.. Verapamil was obtained from Shanghai Hefeng Pharmaceutical Co., Ltd.. Naproxen was obtained from National Institute for the Manage of Pharmaceutical and Biological Merchandise. Ethyl acetate was obtained Letrozole from Sinopharm Chemical Reagent Co., Ltd.. Acetonitrile was obtained from Merck. Forty-eight male Sprague Dawley rats weighing 220 20 g were provided by the Experimental Animal Center of Shandong Engineering Research Center for Natural Drugs, certicate number 20030020. All experimental procedures carried out in this study were performed in accordance with the rules for the Care and Use of Laboratory Animals of Yantai University. The subjects were kept with free access to food and water on a 12 h light/dark cycle. They were housed in plastic cages and mapk inhibitor randomly divided in to two groups with 24 animals in each group: the control group and the verapamil group. The subjects in the verapamil group were administered intraperitoneally with verapamil at a dose of 20 mg kg1. The subjects in the control group were treated with the same volume of normal saline. Ninety minutes later, all subjects were treated intravenously with Danshensu by tail vein. At 15 min, 30 min, and 60 min after Danshensu treatment, the animals were anesthetized with chloral hydrate and then 5 mL heparinized blood were collected from abdominal aorta and the rats were perfused with 100 mL of ice cold normal saline each. The mind was rapidly taken off the cranium and weighed. Then your brain was homogenized in 4 volumes of 0. 1 mol L1 ice phosphate buer. Three milliliters NSCLC of ethyl acetate was added into 200 uL of the homogenate. After vortexing for 3 min and centrifuging for 5 min, the supernatants were evaporated to dryness under a gentle nitrogen stream at 40 C. The elements were resuspended in mobile phase. The blood samples were centrifugated for 10 min and plasma was separated. Plasma was treated as described for brain homogenate supernatants. The chromatographic separation was performed utilizing an Agilent 1100 Series HPLC system designed with a vacuum degasser, a quaternary pump, an, and a column oven. The chromatographic separation was run on a ODS C18 column. The mobile phase was acetonitrilewater. The pump was operated at a rate of 0. 2 mL min1. mapk inhibitor Separations were done at the temperature of 20 C. Mass spectrometric detection was performed utilizing a TSQ Quantum tandem mass spectrometer designed with an electrospray ionization source. Quantication was performed using selected reaction track of the transitions of m/z 197. 0?? m/z 135. 1 for Danshensu and m/z 229. 0?? m/z 170. 1 for the naproxen. The mass spectrum conditions were optimized as follows: spray voltage, 3000 V, sheath gas pressure, 30 psi, additional gas pressure, 5 arbitrary device, capillary temperature, 350 C, collision induced dissociation voltage, 18 V, argon gas pressure, 1. 5 millitorr. Data acquisition was performed with Xcalibur software. Ionization was controlled in negative Selected Ion Monitoring style. Sheath gas pressure was 30 kPa Letrozole and mapk inhibitor aux gas pressure was 5 kPa. Capillary temperature was 150 C. Ion sweep gas pressure was 0 kPa and Tube Lens oset was 105 eV. Data is expressed as means SEM. The statistical signicances of the information were determined using one way analysis of variance followed closely by minimal Signicant Dierence screening. The P value. 05 was considered as statistically signicant. Chromatogram of Danshensu. Figures 1 and 2 show the typical SRM chromatograms of the blank rat brain, brain spiked with Danshensu and naproxen, brain of Danshensu treated rat with spike of naproxen, blank rat plasma, plasma spiked with Danshensu and naproxen, plasma of Danshensu treated rat with spike of naproxen.
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