Aminoacyl-tRNA syntheses (AARS) can catalyze the adenosine triphosphate (ATP)-dependent acylation of their cognate tRNA(s) with a specific amino acid. They can be seen as an index to reflect the energy metabolic rate of ischemic brain cells in ischemic penumbra. This study examined the relationship between arginyl-tRNA synthetase (ArgRS), one of the AARS, and cerebral ischemia in rats. The model of middle cerebral artery occlusion (MCAO) was established in rats. The expression levels of ArgRS protein and mRNA were detected in rat brain tissues at different time points following MCAO by Western blotting and RT-PCR, respectively. The results showed that the MCAO model was successfully established. Western blotting and RT-PCR analysis revealed that the ArgRS protein and mRNA were expressed in brain cells in both ischemic and normal penumbra tissues. The expression levels of ArgRS protein and mRNA peaked at 6 h after MCAO and decreased gradually. At 24 h, the expression levels of ArgRs protein and mRNA in ischemic penumbral tissues were lower than those in normal tissues. The expression levels of ArgRS mRNA and protein in ischemic penumbra varied with ischemic time, suggesting that the energy metabolism of brain cells in penumbra changed dynamically after ischemia to ensure the endogenous self-protection of the body. The brain oxygen supply should be improved as soon as possible, especially within 6-12 h after ischemia, so as to meet the demand for energy metabolism in ischemic penumbra and make sure the cell structure remains stable.

BACKGROUND: Paraquat (PQ) is an effective herbicide and is widely used in agricultural production, but PQ poisoning is frequently seen in humans with the lung as the target organ. Clinically pulmonary pathological changes are often used to predict the severity and prognosis of the patients. In this study, we observed the expression of heat shock protein 70 (HSP70) in rat lung after PQ poisoning and to investigate the therapeutic effects of ulinastatin. METHODS: Seventy-two adult healthy SD rats were randomly divided into a control group (group A, n=24), a poisoning group (group B, n=24), and an ulinastatin group (group C, n=24). The rat models of acute PQ poisoning were established by intra-gastric administration of 80 mg/kg PQ to rats of groups B and C, and the rats of group C were intra-peritoneally injected with 100000 IU/kg ulinastatin 30 minutes after poisoning. The expression of HSP70 in lung tissue was observed, and W/D and histopathological changes in the lung tissue were compared 12, 24, 48 and 72 hours after poisoning. The expression of HSP70 in the lung tissue was assayed by using RT-PCR. All quantitative data were processed with one-way analysis of variance to compare multiple sample means. RESULTS: Compared to group A, the expression of HSP70 in the lung of rats in groups B and C increased significantly at all intervals (P<0.05). The pathological changes in lung tissue of rats with PQ poisoning included congestion, leukocytes infiltration and local hemorrhage, whereas those of group C were significantly lessened. CONCLUSION: Ulinastatin may ameliorate acute lung injury to some extent after PQ poisoning in rats by enhancing the expression of HSP70.

BACKGROUND: Paraquat (PQ) is an effective herbicide and is widely used in agricultural production, but PQ poisoning is frequently seen in humans with the lung as the target organ. Currently, there are many studies on lung injury after PQ poisoning. But the kidney as the main excretory organ after PQ poisoning is rarely studied and the mechanisms of this poisoning is not very clear. In this study, we observed the expression of caspase-3 and livin protein in rat renal tissue after PQ poisoning as well as the therapeutic effects of ulinastatin. METHODS: Fifty-four Sprague-Dawley (SD) rats were randomly divided into three experimental groups: control group (group A), paraquat poisoning group (group B) and ulinastatin group (group C), with 18 rats in each group. Rats in group B and group C were administered intragastrically with 80 mg/kg PQ, rats in group C were injected peritoneally with 100000 U/kg ulinastatin once a day, while rats in group A were administered intragastrically with the same volume of saline as PQ. At 24, 48, 72 hours after poisoning, the expression of livin in renal tissue was detected by Westen blotting, the expression of caspase-3 was detected by immunohistochemistry, and the rate of renal cell apoptosis was tested by TUNEL detection. The histopathological changes were observed at the same time. RESULTS: Compared to group A, the expression of caspase-3 in the renal tissue of rats in groups B and C increased significantly at any time point. Compared with group B, the expression of caspase-3 in renal tissue of rats in group C decreased. Compared with group A, the expression of livin in renal tissue in rats of groups B and C increased significantly at any time point (P<0.01), especially in group C (P<0.01). TUNEL method showed that the rate of renal cell apoptosis index was higher in group B at corresponding time points than in group A (P<0.01), and was lower in group C at corresponding time points than in group B (P<0.01). CONCLUSION: UTI has a protective effect on the renal tissue of rats after paraquat poisoning through up-regulating the expression of livin and down-regulating the expression of caspase-3, but the regulation path still needs a further research.

Traditional Chinese medicine has a long history, unique system and perfect technology, which has been used to prevent or treat a variety of diseases in the form of compound medicine. Recently, some of the active ingredients from Chinese medicine were found to have self-assembly properties, mainly through non-covalent interactions, including π-π stacking, electrostatic interaction, hydrogen bond and coordination interactions, etc. Carrier-free nanoparticles based on self-assembly of active ingredients from Chinese medicine could not only improve the solubility of insoluble active ingredients, but also the bioavailability. As nanocarriers, the natural active ingredients could exert synergistic therapeutic effects. The strategy of self-assembly without carrier is safer and almost non-toxic compared to the commonly used nanocarriers. In addition, some ingredients from Chinese medicine could coordinate with metal ions to form stable nanoparticles, which could be applied to photothermal therapy. In this paper, we summarized and analyzed the recent achievements of carrier-free nanoparticles based on self-assembly of active ingredients from Chinese medicine, and briefly outlined the future development of this kind of nanomedicine.

Recent years, China has released a series of policies to encourage drug research and development in pediatric populations, aiming to meet pediatric populations' medical needs. Because of the physical and psychological developmental characteristics, tolerance of aversive feelings when taking medications are different between pediatric population and adults. So pediatric populations are at a relatively higher risk of not taking medications as prescribed when the medication tasted unpleasant. Therefore, sound design and evaluation of oral sensory features have important clinical significance and value in developing pediatric medications. "Technical guidance for the design and evaluation of the oral sensory features of pediatric drugs (trial version) " was released in November 2022, by Centre for Drug Evaluation, National Medical Products Administration of China. Based on the guidance, this article will introduce the drafting background and review considerations, hoping to provide reference for the design and evaluation of oral sensory features, and promote drug developing in pediatric population.

To study the in situ intestinal absorption kinetics of flrubiprofen in rats, the absorption of flurbiprofen in small intestine (duodenum, jejunum and ileum) and colon of rats was investigated using in situ single-pass perfusion method and the drug content was measured by HPLC. The effects of drug concentration on the intestinal absorption were investigated. The K(a) and P(app) values of flurbiprofen in the small intestine and colon had no significant difference (P > 0.05). Drug concentration (4.0, 10.0 and 16.0 mg x L(-1)) had no significant influence on the K(a) values (P > 0.05). However, when concentration was 4.0 mg x L(-1) and 10.0 mg x L(-1), significant effect on the P(app) values (P < 0.05) was found, but significant effect on the P(app) values was not shown between 10.0 mg x L(-1) and 16.0 mg x L(-1) (P > 0.05). The K(a) and P(app) values of flurbiprofen on the perfusion flow rate had significant difference (P < 0.05). Flurbiprofen could be absorbed at all segments of the intestine in rats and had no special absorption window. The absorption of flurbiprofen complies with the facilitated diffusion in the general intestinal segments, and accompany with the cytopsistransport mechanism probably. The perfusion flow rate had significant effect on the K(a) and P(app).
Analgesics ; administration & dosage ; pharmacokinetics ; Animals ; Anti-Inflammatory Agents, Non-Steroidal ; administration & dosage ; pharmacokinetics ; Colon ; metabolism ; Dose-Response Relationship, Drug ; Duodenum ; metabolism ; Female ; Flurbiprofen ; administration & dosage ; pharmacokinetics ; Ileum ; metabolism ; Intestinal Absorption ; Jejunum ; metabolism ; Male ; Perfusion ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo explore the effect of fixation of Kirschner needle and thread cancellous bone screw through the sinus tarsi interstice for the treatment of calcaneal fractures.

METHODSFrom January 2009 to December 2012,20 patients with calcaneal fracture were treated by minimally invasive Kirschner wire and threaded cancellous bone screw fixation and bone graft,including 12 males and 8 females with an average age of 39 years old ranging from 21 to 65. Among them, 8 cases were left foot, 12 were right foot. According to Sanders's classification, 8 cases were type II, 10 cases were type III, 2 cases were type IV.

RESULTSAll patients were followed up from 6 to 16 months with an average of 12 months. The incision were healed. Böhler angle were increased from preoperative (17.75 +/- 4.22) degrees to postoperative (26.85 +/- 7.37) degrees (t = 4.308, P = 0.000). Gissane angle were reduced from preoperative (137.05 +/- 24.91) degrees to postoperative (113.75 +/- 13.17) degrees (t = 7.083, P = 0.000). At 3 months after operation, the scores of AOFAS were 85.50 +/- 7.99; the results were excellent in 5 feet and good in 11 feet, fair in 3 feet, and poor in 1 foot.

CONCLUSIONMinimally invasive fixation of Kirschner needle and thread cancellous bone screw fixation is a simple operation, it can get reliable fixation, easy to remove, low cost, less postoperative complications, and it is a good treatment of calcaneal fracture.

Adult ; Aged ; Bone Screws ; Bone Wires ; Calcaneus ; injuries ; surgery ; Female ; Fracture Fixation, Internal ; methods ; Humans ; Male ; Middle Aged

OBJECTIVETo observe the expression levels of heat shock protein 70 (hsp70) and NF-kappaB p65 mRNA in lung tissue of acute paraquat (PQ) poisoning rats, and intervention effects of ulinastatin (UTI).

METHODSSeventy-two Sprague-Dawley (SD) rats were randomly divided into three groups: PQ poisoning group, UTI group and control group. The rats were exposed intragastrically to PQ at the dose of 80 mg/kg to establish a model of the rat acute lung injury. The UTI group was intervened by peritoneal injection with 10000 U/kg UTI in 30 minutes. On the 12, 24, 48, 72 h after exposure, myeloperoxidase (MPO) activity in lung tissue were detected. The expression of the NF-kappaB p65 mRNA and hsp70 mRNA in lung tissue was detected by the reverse transcription-PCR (RT-PCR). The lung pathological changes of rats were observed.

RESULTSThe degree of lung injury in PQ group and UTI group was higher than that in control group. But in UTI group the degree of lung injury was lower than PQ group. MPO activity in the lung tissues in PQ group was (31.72 +/- 6.42), (56.23 +/- 8.63), (87.21 +/- 10.02) and (107.21 +/- 13.52) micro/g in 12, 24, 48 and 72 h, respectively which was significantly higher than that [(11.38 +/- 1.25) micro/g] in control group (P < 0.01). MPO activity in the lung tissues in UTI group was (15.65 +/- 3.21), (35.98 +/- 5.74), (59.33 +/- 9.65) and (71.25 +/- 10.58) micro/g in 12, 24, 48 and 72 h, respectively which was significantly lower than those in PQ group (P < 0.01). The expression levels of NF-kappaB p65 mRNA of lung tissues in UTI group in 12, 24, 48 and 72 h were 0.3288 +/- 0.0147, 0.5337 +/- 0.0328, 0.7357 +/- 0.0424 and 0.7547 +/- 0.0905, respectively, which were significantly lower that those (0.4185 +/- 0.0294, 0.8532 +/- 0.0841, 0.9554 +/- 0.0975 and 1.0094 +/- 0.0703) in PQ group (P < 0.01). hsp70 mRNA expression levels in 12, 24, 48 and 72 h of the UTI group were 0.5193 +/- 0.0254, 0.8289 +/- 0.0606, 0.7566 +/- 0.0277 and 0.4873 +/- 0.0105, respectively, which were significantly higher than those (0.3897 +/- 0.0125, 0.5904 +/- 0.0186, 0.4007 +/- 0.0237 and 0.2293 +/- 0.0137) in PQ group (P < 0.01).

CONCLUSIONThe expression levels of hsp70 mRNA and NF-kappaB p65 mRNA of rats after intoxication increased significantly. UTI can protect the lung tissues by elevating the expression of hsp70 and reducing the expression of NF-kappaB in the lung tissues of rats with acute paraquat poisoning.

Animals ; Glycoproteins ; pharmacology ; HSP70 Heat-Shock Proteins ; metabolism ; Lung ; drug effects ; metabolism ; pathology ; Male ; Paraquat ; poisoning ; Peroxidase ; metabolism ; RNA, Messenger ; genetics ; Rats ; Rats, Sprague-Dawley ; Transcription Factor RelA ; metabolism

Ecological methodology plus negative binomial regression were used to identify dengue fever (DF) epidemiological status and its relationship with meteorological variables. From 2007 to 2012, annual incidence rate of DF in Guangzhou was 0.33, 0.11, 0.15, 0.64, 0.45, and 1.34 (per 100 00) respectively, showing an increasing trend. Each 1° C rise of temperature corresponded to an increase of 10.23% (95% Cl 7.68% to 12.83%) in the monthly number of DF cases, whereas 1 hPa rise of atmospheric pressure corresponded to a decrease in the number of cases by 5.14% (95% Cl: 7.10%-3.14%). Likewise, each one meter per second rise in wind velocity led to an increase by 43.80% or 107.53%, and one percent rise of relative humidity led to an increase by 2.04% or 2.19%.
Adult ; China ; epidemiology ; Dengue ; epidemiology ; Humans ; Weather ; Young Adult

0.05).Conclusions There is no obvious effect of danazol alginate microspheres used for uterine arterial embolization on ovarian function in rabblits.After UAE some animals are able to achieve pregnancies,while harmful effects are observed on short term pregnant rate.