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Objective:To estimate the renal absorbed dose in the treatment of neuroendocrine tumors using 177Lu-DOTA-TATE and to assess the radiation safety and guide the treatment. Methods:The dosimetric calculations of patients treated with 177Lu-DOTA-TATE were carried out based on planar images of single photon emission computed tomography (SPECT). The regions of interest (ROIs) of the whole body and kidneys were delineated and converted into activity. Accordingly, the time-activity curves of the ROIs were obtained. The effective half-lives and cumulative activity of ROIs were calculated through the fitting of a single exponential equation of the ROIs. Then the absorbed doses were calculated based on the medical internal radiation dosimetry (MIRD) formalism. Results:A total of 11 patients with neuroendocrine tumors received 18 cycles of treatments with 177Lu-DOTA-TATE. The effective half-lives of 177Lu-DOTA-TATE in the whole body and kidneys were 20.0-99.8 h and 38.2-75.2 h, respectively, with an average of (57.3 ± 21.4) h and (53.1 ± 12.5) h, respectively. The renal absorbed doses of 177Lu-DTA-TATE were 0.25-1.48 mGy/MBq, with an average of (0.90 ± 0.31) mGy/MBq. The minimum and maximum renal absorbed doses in a single treatment cycle were 1.8 Gy and 9.6 Gy, respectively, while the maximum renal absorbed dose in multiple treatment cycles was 21.7 Gy. Conclusions:The renal absorbed doses in the treatment of neuroendocrine tumors using 177Lu-DOTA-TATE were estimated. The result indicate that the renal absorbed doses were lower than the tolerable dose limits. This study is expected to guide the precise treatment of neuroendocrine tumors.
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As a new class of hypoglycemic agents, the blood pressure effects of glucagon-like peptide 1 receptor agonists(GLP-1RAs)have been paid more and more attention. In animal experiments, the effects on blood pressure vary both acutely and with chronic administration. Clinical series of studies have confirmed the blood-lowering effect of GLP-1RAs administered chronically, and the antihypertensive effects of different GLP-1RAs appeared to be no significantly different. Brain stem nuclei, heart, kidney, and vascular endothelial cells might be involved in the mechanism underlying the effects on blood pressure. This paper reviews the blood pressure effects and mechanisms of glucagon-like peptide 1 and GLP-1RAs in animals as well as its clinical effects.
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Objective:To produce the solid target nuclide 89Zr , and prepare the probe 89Zr-desferrioxamine (DFO)-Trastuzumab. Methods:The 89Y(p, n) 89Zr nuclear reaction was used for 89Zr production. 89Y target was irradiated by 20 μA proton in a medical cyclotron ( E=12.5 MeV) for about 1-2 h. 89Zr was purified from hydroxamate resin using 1 mol/L oxalic acid solution. The characteristic peak, radionuclide purity and radiochemical purity of 89Zr were determined by γ-ray spectroscopy. 89Zr-DFO-Trastuzumab probe was synthesized by the reaction of 89Zr-oxalate and DFO-Trastuzumab at room temperature, and the radiochemical purity was measured. Results:89Zr was prepared successfully for 11 times, and the production of 89Zr was 555-1 506 MBq, with production rate of (34.8±5.2) MBq·μA -1·h -1. After the purification (purification rate: 42%-87%), 227.2-991.6 MBq 89Zr was obtained, with the concentration of 1.0×10 6 MBq/L. The γ spectrum showed that the characteristic peak of 89Zr were 511 and 909 keV, and no impurities were found. The radionuclide purity and radiochemical purity were both close to 100%. 89Zr-DFO-Trastuzumab was successfully labeled with radiochemical purity more than 95%, and it was above 90% within 72 h in human serum albumin (HSA) solution. Conclusion:Through the self-designed target assembling, the solid target PET nuclide 89Zr with high quality and labeling are successfully achieved, which provides guarantee for the clinical application of the 89Zr drug.
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OBJECTIVE:To establish a method for simultaneous determination of P-coumaric acid and ferulic acid in the couple of Sparganium stoloni and Curcuma aeruginosa,and to investigate rational proportion of the couple.METHODS:HPLC method was adopted.The determination was performed on Agilent 20RBAX XDB-C18 column with mobile phase consisted of acetonitrile-0.1％ phosphoric acid (gradient elution) at the flow rate of 1.0 mL/min.The detection wavelength was set at 266 nm,and the column temperature was 30 ℃.The sample size was 10 μL RESULTS:The linear ranges of P-coumaric acid and ferulic acid were 4.218 6-21.093 μg/mL(r=0.999 8),1.836 0-9.180 μg/mL(r=0.999 9),respectively.RSDs of precision,stability and reproducibility tests were all lower than 2.0％.The recoveries were 98.72％-100.30％ (RSD=0.18％,n=9),99.11％-100.45％ (RSD=0.46 ％,n =9).Among 4 compatibility proportions of the couple of S.stoloni and C.aeruginosa (1 ∶ 1,2 ∶ 1,1 ∶ 2,1 ∶ 0,m/m),the dis-solution rate of P-coumaric acid and ferulic acid were the highest when the ratio of S.stoloni-C.aeruginosa (m/m)was 2 ∶ 1.CON-CLUSIONS:The method is simple,accurate,stable and reproducible,and can be used for content determination of P-coumaric acid and ferulic acid in the couple of S.stoloni and C.aeruginosa.when the proportion of the couple of S.stoloni and C.aeruginosa is 2∶1 and the contents of P-coumaric and ferulic acid are the highest,the contents of main etfective components are the highest.
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OBJECTIVE:To establish a method for simultaneous determination of P-coumaric acid and ferulic acid in the couple of Sparganium stoloni and Curcuma aeruginosa,and to investigate rational proportion of the couple.METHODS:HPLC method was adopted.The determination was performed on Agilent 20RBAX XDB-C18 column with mobile phase consisted of acetonitrile-0.1％ phosphoric acid (gradient elution) at the flow rate of 1.0 mL/min.The detection wavelength was set at 266 nm,and the column temperature was 30 ℃.The sample size was 10 μL RESULTS:The linear ranges of P-coumaric acid and ferulic acid were 4.218 6-21.093 μg/mL(r=0.999 8),1.836 0-9.180 μg/mL(r=0.999 9),respectively.RSDs of precision,stability and reproducibility tests were all lower than 2.0％.The recoveries were 98.72％-100.30％ (RSD=0.18％,n=9),99.11％-100.45％ (RSD=0.46 ％,n =9).Among 4 compatibility proportions of the couple of S.stoloni and C.aeruginosa (1 ∶ 1,2 ∶ 1,1 ∶ 2,1 ∶ 0,m/m),the dis-solution rate of P-coumaric acid and ferulic acid were the highest when the ratio of S.stoloni-C.aeruginosa (m/m)was 2 ∶ 1.CON-CLUSIONS:The method is simple,accurate,stable and reproducible,and can be used for content determination of P-coumaric acid and ferulic acid in the couple of S.stoloni and C.aeruginosa.when the proportion of the couple of S.stoloni and C.aeruginosa is 2∶1 and the contents of P-coumaric and ferulic acid are the highest,the contents of main etfective components are the highest.
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This article discusses the production of CAI courseware and the problems of its application to teaching process,to make full use of it and acquire satisfactory teaching effects.