BACKGROUND:Frog active peptides have rich activities,such as antibacterial and anti-tumor,and are expected to solve the problem of antibiotic resistance. OBJECTIVE:The active peptide QUB2984 was discovered in the skin secretions of Agalychnis callidryas.Its structure and properties were simulated by bioinformatics.The peptide was synthesized,purified,and identified and its biological functions were investigated. METHODS:Agalychnis callidryas skin secretions were collected by electrostimulation.The sequence of QUB2984 was obtained through constructing a cDNA library with isolated mRNA.BLAST was used for peptide sequence alignment.Besides that,Iterative Threading ASSEmbly Refinement(I-TASSER)and HeliQuest tools were used for protein secondary structure simulation.It was synthesized by solid-phase peptide synthesis,purified by reverse-phase high-performance liquid chromatography,and structurally confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.The purified peptide was used to evaluate its biological activity.Its antibacterial effect was evaluated by the minimum inhibitory concentration method.Its cytotoxic effect was detected by MTT assay.Its safety was investigated by a hemolysis test. RESULTS AND CONCLUSION:(1)Peptide QUB2984 had basically α-spiral structure,with a relatively intact hydrophobic surface,and a certain destructive ability to biofilm.The third amino acid position of QUB2984 was composed of W and had a G-X-G structure.(2)The minimum inhibitory concentration of QUB2984 against gram-positive Staphylococcus aureus was 2 μmol/L,the minimum inhibitory concentration against gram-negative Escherichia coli was 2 μmol/L,and the minimum inhibitory concentration against the fungus Candida albicans was 8 μmol/L.(3)The active peptide QUB2984 had obvious inhibitory effect on human non-small cell lung cancer cells NCI-H838 at 10-5 mol/L concentration,and the hemolytic effect on horse red cells at 64 μmol/L concentration was 50%.(4)The results showed that QUB2984 had anti-bacterial and anti-cancer activity,and it had a positive charge of +3,which was conducive to contact with bacteria or cells.

Objective:To compare the image quality, radiation dose, and total iodine content of abdominal computed tomography (CT) enhancement scanning of overweight and obese patients with different scanning protocols, and to explore the optimal keV image serial for abdominal CT.Methods:A total of 90 overweight or obese patients [24 kg/m 2 ≤ body mass index (BMI) < 28 kg/m 2 or BMI ≥ 28 kg/m 2] were divied into groups A, B and C, with 30 patients in each group. Group A used Gemstone spectral imaging (GSI) mode and contrast medium with 320 mg I/ml, group B used low tube voltage mode (100 kVp) and contrast medium with 370 mg I/ml, and group C used conventional tube voltage mode (120 kVp) and contrast medium with 370 mg I/ml. Monochromatic energy images at 50-70 keV (5 keV interval) were reconstructed for the arterial and portal vein phases of group A. Radiation dose and total iodine content were recorded and calculated for the 3 groups. The region of interest was placed on the organ, blood vessel, and erector spinae muscle at same level. The CT values and image noise values were measured, and the contrast-to-noise ratio (CNR) was calculated. All images were scored subjectively in double-blinded by two radiologists. One-way analysis of variance or Kruskal-Wallis H test were used to compare The CT values, CNRs, and subjective scores of each subgroup image in group A, group B and group C, and the radiation doses and total iodine contents in 3 groups were compared. The optimal keV value for group A was selected. Results:At 50-60 keV, the CT values and CNRs of arterial and portal vein phases in group A were higher ( P < 0.05) than or similar to those in groups B and C ( P > 0.05), and the subjective scores were lower than those of groups B and C at 50 and 55 keV ( H = 34.47, 41.27, P < 0.05), whereas there was no statistically significant difference at 60 keV ( P > 0.05). At 65 and 70 keV, only the CT value and CNR of the renal cortex in group A at the 65 keV of arterial phase were higher than those in groups B and C ( F = 102.38, 29.47, P < 0.001). The subjective scores were not significantly between groups B and C ( P > 0.05). There were no statistically significant difference between CT values, CNRs, or subjective scores in group B and group C ( P > 0.05). The effective doses in groups A and B were 24.72% and 25.78% lower than those in group C, respectively. Compared to groups B and C, the total iodine content in group A decreased by 12.50% and 13.34%, respectively. Conclusions:GSI model combined with a low-concentration contrast medium in abdominal CT for overweight and obese patients can meet the image quality requirements while reducing patient total iodine content and radiation dose. The optimal keV value of enhanced abdominal CT for double phases was 60 keV.

Objective:This article analyzed the current situation, similarities and differences and main problems of the registration and management systems of innovative medical devices in China and the United States.Methods:This article summarized the requirements and policies for the registration management of innovative medical devices in China and the United States, as well as the development and differences of the registration of innovative medical devices in China and the United States, and the main problems in the registration management of innovative medical devices in China.Results:At present, the development level of medical device industry in China and the United States was different, facing different development problems, and there were differences in the access standards and management methods of innovative medical devices. The registration management system established for innovative medical devices in China was gradually improving, and to a certain extent, it had promoted the enthusiasm of innovative product research and development and registration applications, but there were also problems such as unclear innovation evaluation scales, insufficient early intervention of review resources, and insufficient utilization of post-marketing data.Conclusions:Drawing on the beneficial experience of breakthrough device registration management in the United States, we will improve the registration management system for innovative products and shorten the review and approval cycle by clarifying the identification criteria for innovative medical devices, promoting the placement of review resources in the R&D stage, and further strengthening the use of post-marketing data and regulatory scientific research.

Objective The incidence of coronary microvascular disease(CMVD)is increasing annually.According to traditional Chinese medicine(TCM),CMVD belongs to the category of"collaterals",and qi deficiency and blood stasis are the main syndrome type of CMVD.Notably however,no studies have reported on the use of animal models of CMVD with qi deficiency and blood stasis.The current study therefore aimed to establish and evaluate a rat model of CMVD with qi deficiency and blood stasis syndrome.Methods Forty-five male SD rats were divided randomly into sham group,CMVD group,and CMVD + QXXY group(n = 15 rats per group).Rats in the CMVD + QXXY group were randomly deprived of sleep for 14～16 h/day for 6 weeks,and the model of qi deficiency syndrome was established.Animals in the sham group and the CMVD group were fed normally for 6 weeks.After 6 weeks,rats in the CMVD and CMVD + QXXY groups were anesthetized,their chests were opened,and embolic microspheres(40～120 μm)were injected into the left ventricle.Rats in the sham group underwent thoracotomy without injection of embolic microspheres.On day 7 after operation,relevant detection indicators were measured in each group.Results Compared with the sham group,the CMVD group showed a significant decrease in left ventricular ejection fraction and left ventricular shortening rate,while the activities of creatine kinase MB isoenzyme(CK-MB)and lactate dehydrogenase(LDH)were significantly increased.Heart function,hemorheology,myocardial enzyme index,and the degree of myocardial cell damage differed significantly between the CMVD + QXXY group compared with the sham group.Conclusions A rat model of CMVD + qi deficiency + blood stasis syndrome can be successfully established by sleep deprivation combined with intraventricular injection of embolic microspheres.This model will be suitable for the study of the pathogenesis of CMVD and the mechanisms of TCM.

The incidence rate of liver cancer has been rising in recent years. Traditional cell line culture and human patient-derived tumor xenograft models, which are commonly used tools to simulate the occurrence of human liver cancer, have deepened the understanding of tumor occurrence, development, and drug resistance mechanisms. However, they cannot reflect the accurate state of cancer cells, the tumor microenvironment, or spatial structural characteristics. Recently, more in vitro-produced physiological liver organoids have been applied in the study of liver cancer. Liver organoid models have made breakthroughs in the occurrence and development mechanisms of liver cancer, personalized drug screening and biomarker identification, immunotherapy, and regenerative medicine applications. This paper mainly summarizes the progress and application of liver organoids processed in the study of liver cancer.

ObjectiveTo explore the effect of Buyang Huanwutang （BYHWT） on platelet function and inflammatory cytokines in the rat model of acute blood stasis. MethodThe model of acute blood stasis was established with SD rats by ice water bath combined with injection of epinephrine. Rats were randomly assigned into four groups： normal group， model group， BYHWT （3.2 g·kg^-1） group， and aspirin （60 mg·kg^-1） group. The rats were injected with epinephrine hydrochloride on day 8 after 7 days of modeling. The macroscopic indexes of triditional Chinese medicine （TCM） syndrome including tongue manifestation and pulse manifestation were observed， while hemorheological indexes， blood coagulation， and platelet aggregation were detected. The serum levels of the inflammatory cytokine matrix metalloprotein-9 （MMP-9） and the adhesion factor intercellular adhesion molecule-1 （ICAM-1） and were determined by enzyme-linked immunosorbent assay （ELISA）. ResultThe pulse distention of rats in the model group was lower than that in the normal group （P<0.01）， while BYHWT improved the pulse distention of the rats with the syndrome of blood stasis （P<0.01）. In the model group， the tongue showed the characteristics of blood stasis syndrome， with dark purple veins at the tongue bottom and lower values of R， G， B on the tongue surface than those in the normal group （P<0.01）， which， however， can be recovered by BYHWT （P<0.01）. The blood viscosity at high， medium， and low shear stress and the plasma viscosity in the model group were higher than those in the normal group （P<0.01， P<0.05）. Compared with the model group， BYHWT restored the whole blood viscosity under high， medium and low shear stress and plasma viscosity （P<0.05，P<0.01）. The model group had shorter prothrombin time （PT）， shorter thrombin time （TT）， and higher fibrinogen （FIB） than the normal group （P<0.05， P<0.01）. BYHWT improved the TT and reduced the FIB in the rats with blood stasis syndrome （P<0.01）. The platelet aggregation rate induced by arachidonic acid （AA） and adenosine diphosphate （ADP） in the model group was higher than that in normal group （P<0.01） and BYHWT decreased the platelet aggregation rate of the rats with blood stasis syndrome （P<0.01）. The results of scanning electron microscopy showed that the model group exhibited excessive platelet activation， obvious pseudopodia， and increased aggregation of platelets compared with the normal group， while platelet activation and aggregation were rare in the BYHWT group. The serum levels of MMP-9 and ICAM-1 in the model group were higher than those in the normal group （P<0.01）， which were decreased in the BYHWT group （P<0.05， P<0.01）. ConclusionThe SD rats with the syndrome of acute blood stasis induced by ice water bath combined with injection of epinephrine demonstrate obvious changes in platelet function and morphology， inflammation， and abnormal cell adhesion. In the treatment of acute blood stasis in rats， BYHWT may reduce thrombosis and improve blood consistency and cohesion by mitigating inflammation， down-regulating cell adhesion factor overexpression， and improving platelet shape and function.

ObjectiveTo compare the feasibility of establishing the rat model of acute coronary syndrome with combined blood stasis and poison by lipopolysacharide （LPS） injection， ligation of coronary artery and different combinations of the two methods. MethodA total of 225 male SD rats were randomly divided into sham operation group， simple coronary artery ligation group， first injected LPS group ［LPS（5 mg·kg）injection 24 h before coronary artery ligation］ and follow injected LPS group ［LPS（5 mg·kg）injection 10 min after coronary artery ligation］. The indexes of each group were detected at 3， 24， 72 h after modeling， and the model was comprehensively evaluated. The general state and macroscopic evaluation indexes of traditional Chinese medicine （TCM） syndrome （tongue and pulse） of rats in each group were observed. ECG and echocardiography were used to evaluate cardiac function， and the myocardial ischemia and infarction areas were measured by Evans blue/2，3，5-triphenyltetrazolium chloride （TTC） staining. The content of creatine kinase isoenzyme （CK-MB）， lactate dehydrogenase （LDH）， creatine kinase （CK）， and troponin T （cTnT） in serum as well as interleukin-1 β （IL-1β） and IL-6 changes were determined by biochemical method or enzyme-linked immunosorbent assay （ELISA）. Hematology analyzer was adopted to determine the white blood cell （WBC） count， and the four coagulation indexes， platelet aggregation rate， hemorheology and other coagulation evaluation indexes were also detected. The myocardial tissue was observed by hematoxylin-eosin（HE）staining. ResultAfter 3 h of modeling， compared with the conditions in sham operation group， the R， G and B values of tongue of rats （P<0.01）， pulse amplitude （P<0.01）， and cardiac function in simple coronary artery ligation group were decreased， and the color of hypoglossal veins became purple（P<0.01）. The content of CK， LDH， cTnT， IL-1β and IL-6 in serum（P<0.05）， myocardial infarction area（P<0.01）， and total number of WBCs （P<0.05）were increased. Compared with simple coronary artery ligation group， first injected LPS group and follow injected LPS group had increased hypoglossal veins， decreased R value of tongue and elevated cTnT content （P<0.01）， while follow injected LPS group had reduced B value of tongue， decreased cardiac output （CO）（P<0.05）， increased IL-1β content， and thinned left ventricular anterior walls at end-systole （LVAWs）（P<0.01）. After 24 h of modeling， compared with sham operation group， simple coronary artery ligation group presented significantly decreased R， G and B values of tongue， lengthened purplish dark hypoglossal veins （P<0.01）， reduced pulse amplitude（P<0.01） and cardiac function， enlarged myocardial infarction area（P<0.01）， increased whole blood viscosity， platelet aggregation rate， fibrinogen （FIB）， shortened prothrombin time （PT） and thrombin time （TT）（P<0.01）， and elevated total number of WBCs （P<0.01）and content of CK， LDH， cTnT and IL-6 in serum（P<0.05）. Compared with the conditions in simple coronary artery ligation group， the pulse amplitude， R， G and B values of tongue （P<0.01）， and ejection fraction （EF） and fractional shortening （FS） scores （P<0.05）dropped， and hypoglossal veins were deepened and lengthened（P<0.05）， and cTnT content was increased（P<0.01）in first injected LPS group and follow injected LPS group. However， follow injected LPS group had thinned LVPWs， increased LDH content， platelet aggregation rate（P<0.05）， myocardial infarction area， and total number of WBC， level of IL-1β（P<0.05）， and shortened TT（P<0.01）. Additionally， 72 h after modeling， compared with sham operation group， simple coronary artery ligation group showed significantly reduced pulse amplitude， lowered R， G and B values of tongue， thickened and lengthened hypoglossal veins（P<0.01）， decreased cardiac function， and increased content of cTnT， FIB， whole blood viscosity（P<0.01），platelet aggregation rate， level of IL-6 and IL-1β（P<0.05）. Compared with the conditions in simple coronary artery ligation group， the hypoglossal veins of the first injected LPS group and the follow injected LPS group were more purple， and the content of cTnT was boosted（P<0.01）， whereas follow injected LPS group had decreased pulse amplitude， R， G and B values of tongue， EF and FS scores （P<0.05）， and enlarged myocardial infarction area（P<0.01）. ConclusionCompared with the other modeling methods and models at different modeling time， the established model by LPS injection 10 min after coronary artery ligation for 24 h was more consistent with the clinical characteristics of acute coronary syndrome with combined blood stasis and poison.

Patients seeking implantation often have several systemic diseases, which will introduce complications to treatment. This paper reviews the risk assessments and prevention of systemic diseases in patients with oral implant therapy with the relevant literature. The patients with cardiovascular diseases are prone to stroke and cardiac arrest, and anticoagulants and antihypertensive drugs will complicate cases. The potential risks of endocrine system diseases are infections and crises caused by unstable hormone levels. The risks of respiratory diseases are dyspnea and swallowing devices. The difficulty of treating patients with neuropsychiatric diseases is attributable to poor cooperation and adverse effects of the drugs. Bone and joint system diseases may decrease the success of implantation. Hematological system, digestive system and kidney diseases may lead to hemorrhage. By inquiring about detailed medical and medication history, evaluating vital signs and detecting important objective indicators, performing targeted measures, discussing with specialists, and observing patients closely, clinicians can avoid the abovementioned risks.

Objective To assess the quality of reports of clinical randomized controlled trials (RCTs) published in Chinese Journal of Dermatology from 2007 to 2016,and to provide a reference for standardization of clinical paper writing.Methods Based on the consolidated standards of reporting trials (CONSORT) 2010 statement,an evaluation form was designed and used to assess the quality of the clinical RCT articles published in Chinese Journal of Dermatology from 2007 to 2016.Results A total of 94 RCT articles were enrolled,including 45 articles from 2007 to 2011,and 49 articles from 2012 to 2016.Among these articles,the writing of introduction and discussion parts was relatively standardized.In the method and result parts,the proportions of articles correctly reporting blinding (23 articles,24.47％),sample size (0 article),primary and secondary outcome measures (21 articles,22.34％),participant flow (0 article),loss to follow-up (32 articles,34.04％) and compliance (13 articles,13.83％) were low,while the proportions of those correctly reporting inclusion and exclusion criteria,intervention measures,statistical methods,starting and ending time of follow-up and baseline data were all over 80％.Conclusion Most contents of the RCT articles published in Chinese Journal of Dermatology are standardized and clear,but the reporting of blinding,compliance,sample size,participant flow and so on,is insufficient,and close attention should be paid to these items.

Deep brain stimulation (DBS) has been successfully used to treat a variety of brain diseases in clinic. Recent investigations have suggested that high frequency stimulation (HFS) of electrical pulses used by DBS might change pathological rhythms in action potential firing of neurons, which may be one of the important mechanisms of DBS therapy. However, experimental data are required to confirm the hypothesis. In the present study, 1 min of 100 Hz HFS was applied to the Schaffer collaterals of hippocampal CA1 region in anaesthetized rats. The changes of the rhythmic firing of action potentials from pyramidal cells and interneurons were investigated in the downstream CA1 region. The results showed that obvious θ rhythms were present in the field potential of CA1 region of the anesthetized rats. The θ rhythms were especially pronounced in the stratum radiatum. In addition, there was a phase-locking relationship between neuronal spikes and the θ rhythms. However, HFS trains significantly decreased the phase-locking values between the spikes of pyramidal cells and the θ rhythms in stratum radiatum from 0.36 ± 0.12 to 0.06 ± 0.04 ( < 0.001, paired -test, = 8). The phase-locking values of interneuron spikes were also decreased significantly from 0.27 ± 0.08 to 0.09 ± 0.05 ( < 0.01, paired -test, = 8). Similar changes were obtained in the phase-locking values between neuronal spikes and the θ rhythms in the pyramidal layer. These results suggested that axonal HFS could eliminate the phase-locking relationship between action potentials of neurons and θ rhythms thereby changing the rhythmic firing of downstream neurons. HFS induced conduction block in the axons might be one of the underlying mechanisms. The finding is important for further understanding the mechanisms of DBS.