Objective To prepare 99Tcm-B2-S22-AFA (99Tcm-TP1623)and investigate its biodistribution and kinetic imaging in healthy animals.Methods TP-1623 was synthesized and labeled indirectly by 99Tcm using stannous chloride as the reductive agent.The labeling rate was determined with chromatography using Whatman 3MM filter paper and by calculating the specific activity.The biodistribution of 99Tcm-TP1623 was tested at 1,5,10,30,60,120 min after intravenous injection into mice.According to the SPECT images and the time response of the radioactivity in the region of interest (ROI),the dynamic distribution of 99Tcm-TP1623 was assayed.Results The radiolabeling rate of 99Tcm-TP1623 was (96.4-± 0.1) ％ and the specific activity was (24.35 ± 0.06) TBq/mmol.After being conserved at room temperature for 4 h,the radiochemical purity of 99Tcm-TP1623 was (95.03 ± 0.97) ％.The oil-water distribution coefficient was-(2.51 ± 0.15).The bio-distribution test showed that the radioactivity in mice blood disappeared very fast over time by a quick excretion through renal.Meanwhile,the radioactivities in the heart,lung,liver,muscle and bone of mice decreased gradually along time and after 60 min they approached to the lowest levels.The radioactivity in brain always kept at a low level,but the radioactivity in intestinal increased slowly.For rabbits,the SPECT images showed that the radioactivity in blood disappeared quickly and the radioactivities were eliminated through kidneys.Meanwhile there were excretion images in gallbladder and intestinal,but no obvious nuclide accumulation in thyroids and stomach,and low radioactivity in brain as well.Conclusions 99Tcm-TP1623 is easy to prepare and has a high radiolabeling efficiency and good stability in vivo and in vitro,and it has excellent dynamic characteristics in normal animals.

Objective To explore susceptibility of praziquantel(PQT) against Schistosoma japonicum in the repeated chemotherapy areas in Dongting Lake region of China. Methods Sixty mice were divided into two groups, and infected respectively by cercariae released from the infected snails which were collected from new and old endemic areas. After 5 weeks, the mice in each group were divided into control groups and treatment groups (PQT group). The mice in each PQT group were treated with a single oral dose of praziquantel (600 mg/kg). Three weeks post treatment, mice were dissected, and the number of adults, the stool eggs per gram (EPG), the liver EPG and the hatching rates were observed. Results The worm reduction rates of the PQT groups of new and old epidemic areas were 98.24% and 98.71% respectively, and the stool egg reduction rates 99.94% and 99.64%, the liver egg reduction rates 75.85% and 73.10%,and there were no significant differences between the new and old endemic areas. The stool hatching test was positive in the control groups, and negative in the PQT groups. Conclusion Susceptibility of praziquantel against Schistosoma japonicum does not decrease in repeated chemotherapy areas in Dongting Lake region.

OBJECTIVETo assess the association of plasma homocysteine (Hcy) level and 66A/G and 524C/T polymorphisms of methionine synthase reductase (MSR) gene with essential hypertension (EH) in ethnic Uygurs and Hans from Xinjiang.

METHODSFrom September 2011 to July 2014, 199 Uyghur and 216 Han patients were collected, while 195 healthy Uyghur ethnics and 217 healthy Han ethnics were recruited as the controls. Polymerase chain reaction and restriction fragment length polymorphism (PCR-RELP) was adopted to detect the above polymorphisms. Enzyme immunological assay was applied to measure the levels of plasma Hcy.

RESULTSCompared with the control, plasma Hcy levels were significantly higher in EH group in both Uyghur and Han ethnics (P<0.05). In both ethnic groups, there were also significant differences in MSR 524C/T polymorphism between the patients and controls (Uyghur: chi-square=6.559, P=0.038; Han: chi-square=12.684, P=0.002). No significant difference was found in MSR 66A/G polymorphism between the patients and controls in both ethnic groups (P>0.05). Plasma Hcy level in those with a 66G/524C genotype was statistically higher than that with 66A/524T (P<0.05). After adjusting confounding factors such as gender and age, Logistic regression analysis indicated that age (OR=1.924, 95% CI:1.177- 3.164, P=0.009), obesity (OR=2.491, 95% CI: 1.584-3.920, P<0.01), hyperhomocysteine (OR=1.609, 95% CI: 1.016-2.548, P=0.043) were independent risk factors for EH in Uygurs, while age (OR=1.133, 95% CI: 1.010-81.272, P=0.033), hyperhomocysteine level (OR=3.894, 95% CI: 2.432-6.237, P<0.01), and obesity (OR=1.864, 95% CI: 1.141-3.046, P=0.013) were independent risk factors for EH in Han ethnics. No association was found between the polymorphisms and EH in Uygurs and Hans.

CONCLUSIONAge, hyperhomocysteine and obesity were common independent risk factors for EH in both Uygur and Han ethnics from Xinjiang. The MSR 66G genotype can increase the plasma concentration of Hcy, while MSR 524T genotype may reduce it. MSR 524C/T TT genotype may be a protective factor for EH. MSR polymorphisms 66A/G and 524C/T are not independent risk factors for EH in Uygur and Han ethnics from Xinjiang.

Adult ; Aged ; Asian Continental Ancestry Group ; ethnology ; genetics ; China ; ethnology ; Essential Hypertension ; Female ; Ferredoxin-NADP Reductase ; genetics ; metabolism ; Homocysteine ; blood ; Humans ; Hypertension ; blood ; enzymology ; ethnology ; genetics ; Male ; Middle Aged ; Polymorphism, Single Nucleotide