The formulation of the best evidence for early fluid resuscitation management of severe acute pancreatitis patients / 中华胰腺病杂志

Objective:To establish the best evidence-based approach for early fluid resuscitation management in patients with severe acute pancreatitis (SAP).Methods:A literature search was conducted utilizing evidence-based nursing methods to identify relevant evidence on the management of early fluid resuscitation in patients with SAP. The search followed the hierarchical order of the " 6S" evidence pyramid, including databases such as China National Knowledge Infrastructure (CNKI), China Biomedical Literature Database (SinoMed), Wanfang Database, UpToDate, NICE, RNAO Guidelines Network, Pancreatology International, WHO Association Website, JBI, Cochrane, PubMed, EMBASE, and CINAHL. The search was limited to articles published from the establishment of each database to March 2022. The literature quality evaluation tools and an evidence pre-grading system from the JBI Evidence-Based Health Care Center were employed to assess the quality of the literature included in the study. Additionally, the FAME structure was utilized to evaluate the feasibility, appropriateness, clinical significance, and validity of the evidence.Results:Nine articles were finally incorporated into the analysis, including four guidelines, one evidence summary, two systematic reviews, and two expert consensus articles. 21 pieces of evidence pertaining to early fluid resuscitation management in patients with SAP was summarized, encompassing five key aspects: resuscitation timing, type of fluid infusion, total volume and speed of fluid infusion, dynamic monitoring, and fluid resuscitation goals. It was advisable for patients diagnosed with SAP to promptly receive fluid resuscitation, ideally within 72 hours of diagnosis. The initial choice for fluid resuscitation was lactated Ringer′s solution, with the addition of human albumin as a supplementary colloid solution. The quantity of fluid administered within the first 24 hours of rehydration should constitute approximately 33.3% of the total rehydration volume within the 72 hours time-frame. In the case of patients experiencing early shock or dehydration, it was advised that the fluid rate administered should be 5-10 ml·kg -1·h -1 within the first 24 hours of admission. Additionally, an infusion of 20 ml/kg of fluid can be administered within the initial 30-45 minutes. It was recommended to assess the adequacy of early fluid resuscitation every 4-6 hours, ensuring that the resuscitation objective could meet at least two of the following criteria: urine output of 0.5-1 ml·kg -1·h -1, mean arterial pressure of 65-85 mmHg, central venous pressure of 8-12 mmHg, heart rate below 120 beats/min, central venous oxygen saturation of at least 70%, and a decrease in hematocrit levels to 30%-35%. Conclusions:The most compelling evidence supporting the implementation of early fluid resuscitation management in patients with SAP is derived from an evidence-based nursing approach, which could effectively improve patient care outcomes.

Design and biological activity of beta-hairpin-like antimicrobial peptide / 生物工程学报

In the current study, we synthesized a 16-residue-long peptide VR with the aim of inspecting the feasibility to design beta-hairpin-like antimicrobial peptide. The peptide was designed by alternating arrangement of arginine and valine and linking two stranded antiparallel beta-sheet with a short loop segment (DPG) and a disulfide bridge. Antimicrobial and hemolytic activities were investigated. Melittin was chosen as a control peptide. We also tested bactericidal kinetics and salt sensitivity. Results show that VR had similar antibacterial activity compared with melittin. However, VR displayed much less hemolytic activity than melittin. These results suggest that VR had higher cell selectivity than melittin. The antibacterial activity of VR was not inhibited in the presence of 25 and 50 mmol/L NaCl. VR still possessed antibacterial activity in the presence of 100 mmol/L NaCl. Collectively, the de novo peptide VR displayed high antimicrobial activity, low hemolytic activity, and salt resistant, indicating that VR was a promising candidate for novel antimicrobial applications.

The effects of natural static magnetic fields on the proliferation of three human hepatocarcinoma cell lines / 中华物理医学与康复杂志

Objective To observe the effects of a natural static magnetic field (NSMF) on the proliferation of human hepatocarcinoma cells. Methods Three human hepatocarcinoma cell lines ( BEL-7402,HEP G-2 and QGY-7701 ) were cultured under standard conditions and then exposed to NSMFs of 0.1 Tesla at 600 Hz,0.2 Tesla at 250 Hz,0.2 Tesla at 400 Hz or 0.2 Tesla at 500 Hz for 30 minutes daily for 3 or 6 days.Flow cytometry and the XTT cell proliferation assay were used to check apoptosis and the proliferation of cells all groups. Results Only exposure to 0.2 Tesla magnetism at 400 Hz induced apoptosis of the BEL-7402 cell line.None of the NSMFs induced apoptosis in the other 2 hepatocarcinoma cell lines. Conclusions Different reactions of the three hepatocarcinoma cell lines to the same NSMF implies that each cell line has its own features,and that individualized NSMF treatment protocols should be adopted for better clinical outcomes.

Application of multi-copies in expression of smaller peptides: a review / 生物工程学报

The technology of genetic engineering has been widely used to express macromolecules such as enzymes. However, it is difficult to detect and purify the micromolecules such as small peptides, because of their instability and degradability. Construction of multi-copy recombinant expression plasmid can be achieved by inserting multiple target genes or expression cassette containing target genes with the same orientation into expression vector. This is effective to increase the expression level of small peptides. In this article we described four methods in order to provide some optional methods and ideas for the expression of active small peptides.

Evaluating thrombolytic efficacy and thrombus targetability of RGDS-liposomes encapsulating subtilisin FS33 in vivo / 生物医学工程学杂志

A novel fibrinolytic enzyme subtilisin FS33, which exhibits much higher activity for decomposing fibrin than urokinase, was purified from Douchi, a traditional soybean-fermented food in China. In order to increase bio-utilization and thrombus targetability of subtilisin FS33 labeled by fluorescein isothiocyanate (FITC), the surface modified liposomes encapsulating subtilisin FS33 and FITC with a synthetic peptide Arg-Gly-Asp-Ser (RGDS), being putatively a specific antagonist of fibrinogen receptor on platelet membrane, were prepared and used to evaluate the therapeutic efficacy in a rat model thrombotic carotid artery. The arterial thrombosis was induced by applying two pieces of filter paper (1 x 2 cm) saturated with 10% of ferric chloride (FeCl3). The rats were infused via the jugular vein with either liposomes carrying BSA (control group) or RGDS-liposomes carrying subtilisin FS33 at doses of 2000 and 4000 U/kg. The plasma of the group infused with RGDS-liposomes showed higher antithrombotic and fibrinolytic activity than did the control group within 15-120 min after infusing. The higher the dose was gived, the higher the activity was shown. APTT(activiated partial thromboplastin time), PT (prothrombin time) and TT (thrombin time) were extended remarkably (P < 0.05, P < 0.01), and FDP (fibrinogen degradation products) also increased greatly (P < 0.01), while ELT (euglobulinlysis time) decreased obviously (P < 0.05). FITC content in heart and brain evidently increased (P < 0.05), and results of D-dimer test were all positive. In addition, the venous thrombi in brain and kidney were dissolved totally or partly as observed by patholgical section. All these indicated that subtilisin FS33 enhanced the antithrombotic and fibrinolytic activities in rat, and RGDS-liposomes improved, in a certain degree, the thrombolytic specificity for targeting to thrombus.

Effect of rosiglitazone on SREBP-1 and TGF-β1 expressions and accumulation of ECM in renal tubular cells of Wistar rats treated with high fat diet / 中国病理生理杂志

AIM: To study the effect of high fat diet on the expression of sterol regulatory element biding protein-1 (SREBP-1) and transforming growth factor β_1 (TGF-β_1) in renal tubular cells and rosiglitazone intervention. METHODS: Wistar rats were treated with high fat diet and rosiglitazone for 3 months. The serum glucose, serum insulin and serum triglyceride were detected. Oil Red O staining was used to observe the renal lipid deposit and Masson staining was for the detection of ECM accumulation. SREBP-1, TGF-β_1 and FN protein were determined by the methods of immunohistochemistry and Western blotting. SREBP-1 mRNA was detected by in situ hybridization. RESULTS: Rosiglitazone prevented effectively the increase in serum glucose, serum insulin and serum triglyceride resulted from high fat diet. High fat diet led to lipid droplet formation in renal tubular cells and interstitial ECM accumulation, which was decreased by rosiglitazone treatment. Compared to normal rats, SREBP-1 protein and SREBP-1 mRNA showed high expressions in high fat diet rats that were lowered by rosiglitazone. The precursor segment and mature segment of SREBP-1 protein were decreased by 27.39% and 27.32%. Similarly, the high expressions of TGF-β_1 and FN protein in kidney of high fat diet rats were also prevented by rosiglitazone intervention. Compared to high fat diet rats, the expression of TGF-β_1 in rosiglitazone treatment rats was lowered by 19.14%. CONCLUSION: Rosiglitazone prevents effectively the over-expression of SREBP-1 and TGF-β_1 in renal tubular cells, and decreases lipid accumulation and ECM production in rats fed with high fat diet.

Study on the variation in blood concentration of tetramine in human body / 中国综合临床

Objective To study the variation of blood concentration of tetramine in human body with acute tetramine intoxication treated with three different protocols and the levels in human body after discharge from the hos-pital. Methods The blood concentration of tetramine was determined by gas chromatography-mass spectrometry (GC-MS). All 101 patients of acute tetramine intoxication were divided into 3 groups (routine comprehensive treat-ment group,hemoperfusion group,blood transfusion group) according to their blood concentration of tetramine and clinical symptoms. The patients were followed up to monitor the tetramine levels in a year. Results The level of tet-famine in blood was decreased from 33.0(1.7～115.0)μg/L to 18.0(0.3～47.6)μg/L in routine comprehensive treatment group. The total decrement was 45.5 %. The level was decreased from 108.0 (54.0～290.0)μg/L to 26.0 μg/L in hemoperfusion group. The total decrement was 75.9%. The decrement was 20.0%～45.0% after each he-moperfusion. The level was slightly high after 24 h of hemoperfusion. The total decrement in blood transfusion group was 33.5%～60.0%. The level was <0.3μg/L in all 25 out-patients 1 year after their intoxication. Conclusion Routine comprehensive treatment,hemoperfusion,blood transfusion are effective in the treatment of acute tetramine intoxication. The degradation of tetramine in human body is slow.

Expression of ADM and ET-1 was decreased by Losartan in renal of diabetic rats / 基础医学与临床

Objective To investigate the therapeutic effect of Losartan on ADM,ET-1 and their receptors in the kidney of diabetic rats.Methods Experimental diabetes was induced in uninephrectomized rats by STZ.The animals were divided into three groups: group A(control group),group B(diabetic group) and group C(Losartan-treated group).Immunohistochemistry,Western bloting,in situ hybridyzation and RT-PCR were used to detect the protein and mRNA expressions of ADM,ADMR,ET-1 and EDNR-A.Results Compared with group A,the expressions of ADM,ADMR,ET-1 and EDNR-A in group B significantly increased.After Losartan treatment,those indicators decreased.Conclusion The expressions of ADM,ET-1 and their receptors may be responsible for the renal protective effect of Losartan in diabetic rats.

STUDIES ON FIBRINOLYTIC FUNCTION OF SUBTILISIN AND ITS MECHANISM / 营养学报

Objective:To evaluate the effect how Subtilisin FS33 affect thrombotic and fibrinolytic systems in vitro and in vivo. Method:Activity of Subtilisin FS33 was measured by clot liquefaction time(CLT) . On the model of 10% FeCl3 induced thrombi of carotid arteries in rats,various doses of Subtilisin FS33 were injected to the rats,and the fibrinolytic effect was observed. Results:0.5 g of the unheated blood clots gradually dissolved within 45 min,whereas the blood clots heated at 80℃ for 30 min dissolved within 3 h. This indicated that the enzyme was able to degrade blood clots in the absence of endogenous fibrinolytic factors. The experiment in vivo indicated that high dose subtilisn group could significantly prolong CT(coagulation time ) ,PT(prothrombin time) ,TT(thrombin time ) ,APTT(activated partial thromboplastin time) ,reduce ELT(euglobulin lysis time) ,decrease the content of FIB(fibrinogen) ,increase the content of FDP(fibrinogen degradation products) . D-dimer of all experimental groups waspositive. The venous thrombus in lung and kidney was dissolved totally or partly as observed by pathological section. Conclusion:Both thrombolytic effects of Subtilisin FS33 in vitro and in vivo were significant and the mechanisms might be associated with enhancing anticoagulation activity and fibrinolysis.