Objective To assess the clinical ultrasound value of layer‐specific strain in evaluation of left ventricular systolic myocardial dysfunction of uremia patients after long‐time dialysis at different time . Methods A total of 68 uremia patients accepted maintenance hemodialysis ( M HD ) were enrolled . T he patients were divided into two groups according to the dialysis duration :dialysis time ＜3 years ( group B , n＝31) and dialysis time ≥3 years ( group C , n ＝37) . T he age and sex mached healthy cases were selected as control group ( group A , n ＝ 30 ) . T he standard dynamic two‐dimensional echocardiographic viewes of apical four‐chamber ,three‐chamber ,two‐chamber and the short‐axis view at three levels of mitral valve , papillary muscle and apex were acquired for three cardiac cycles . T he highest value of peak systolic longitudinal strain ( LS ) ,circumferential strain ( CS ) at different levels ,left venrticular global longitudinal strain ( GLS ) and global circumferential strain ( GCS ) were respectively assessed from endocardium ,mid‐myocardium and epicardium using GE EchoPAC workstation . T he comparisons of those parameters were performed among the 3 groups for differences . T he efficacies of GLS and GCS at different myocardial layers in diagdosing the left ventricular systolic function of M HD patients were analyzed by the ROC curve . Results ① Global transmural parameters :compared with those in group A ,the values of GLS at three myocardial layers in both M HD groups were significantly decreased ( all P ＜ 0 .01 ) ,the value of GLS at three myocardial layers in group C was also decreased ,and was statistically different from that in group B ( P＜0 .01) . Compared with those in group A ,the values of GCS at mid‐myocardium in group B and three myocardial layers in group C were also decreased ( all P ＜0 .01) . T here was no significant difference of GCS between group B and C ( P ＞0 .05) . ②Longitudinal transmural parameters at different levels :the values of LS at three myocardial layers of mitral valve ,papillary muscle and apex were decreased in group B and C compared with those in group A ( P ＜0 .05 or P ＜0 .01) ; T he values of LS at three myocardial layers of mitral valve ,papillary muscle and apical levels were also decreased in group C compared with those in group B ( P ＜0 .05 or P ＜0 .001) . ③Short‐axis transmural parameters at different levels :compared with those in group A ,the value of CS at mid‐myocardium of mitral valve level was decreased in group B ( P ＜0 .05) ,the values of CS at three myocardial layers of the mitral valve level and mid‐myocardium of papillary muscle level and apical level were decreased in group C ( P ＜0 .05 or P ＜0 .01) . Besides ,compared with those in group B ,the values of CS at mid‐myocardium and epicardium of mitral valve level were also decreased in group C ( P ＜0 .05) . ④ROC curve showed that determining left ventricular systolic dysfunction in M HD patients using GLS ,GCS at different myocardial layers ,when the area under the curve ( AUC ) of GLS of intima was 0 .851 ,the cut‐off value was －21 .45% ,the sensitivity was 72 .7% ,and the specificity was 93 .3% ; when the AUC of GCS of mid‐myocardium was 0 .683 ,the cut‐off value was －17 .08% , the specificity was 58 .5% , and the specificity was 83 .3% . Conclusions T he left ventricular systolic myocardial function is progressively damaged with the extended dialysis duration time . Ultrasonic layer‐specific strain technology could be used to quantitatively evaluate left ventricular systolic transmural myocardial dysfunction and might contribute to the evaluation of the severity of left ventricular myocardial dysfunction clinically for a more accurate intervention .

Objective To define the mechanical features of mitral annulus at various sites,and to investigate the specific mechanics characterization at different mitral annulus sites in evaluation consequences of left ventricular function by dual pulse-wave Doppler (DPW) technology.Methods The DPW spectrums were obtained at lateral and aboral interval,anterior and inferior and posterior mitral annular from 112 normal adults.The peak systolic velocity (Sm),peak early diastolic velocity (Em),peak late diastolic velocity (Am),the beginning time of the peak and the time to peak were measured,and E/A,Em/Am,E/Em,left ventricular ejection fraction (LVEF) and left ventricular fractional shortening (LVFS) were computed.Results 1)Sm,Em,Am and Em/Am measured in the free wall annulus were significantly greater than measured in the interval annulus of mitral annular sites.However,E/Em was opposited (P ＜ 0.05).Sm of the posterior wall mitral annulus accelerated frist and experienced shortest duration in all the mitral annular sites (P ＜ 0.01).There were no significant differences of Em time parameters among different mitral annulus sites.Am of the beginning time and peak time in the free wall annulus were significantly longer than that in the interval annulus of anterior mitral annular sites.However,the acceleration time was opposited(P ＜0.05).2) Sm was correlated with LVEF and LVFS (r =0.243 and r =0.227,P ＜0.01) only at the posterior mitral annular site,Em/Am of anterior and posterior wall mitral annulus had the highest correlations with mitral orifice flow E/A(r =0.545 and 0.545 respectively,P ＜ 0.01).Conclusions There are significant differences among the mechanics patterns at different mitral annulus sites in normal adults.The mechanics characterization at different mitral annulus sites have different conclusions of left ventricular function.

Objective To transfect the recombinant mIL-28A adenovirus vector into lung adenocarcinoma cell line LA795 and research its anticancer activity. Methods Transfected the constructed mouse IL-28(mIL-28) recombinant adenovirus vector into LA795 cell line, detected with PCR, immunocytal fluorescence, Tunel, Annexin V and MTT. Results Transfected with rAd-mlL-28A into the LA795 cells, mIL-28A gene expression products mRNA increased obviously, IL-28 expression was detected in cells obviously,apoptosis cell number increased, and the growth of LA795 cells transfected with rAd-mIL-28A were inhibited obviously. Conclusion The recombinant miL-28A adenovirus vector we have constructed, which expresses IL-28 when transfected to lung adenocarcinoma cell line LA795, inhibits growth of carcinoma cell to some extent, and may work by promoting the apoptosis of cancer cells.

ObjectiveTo evaluate the myocardium damage of myocardial contrast echocardiography (MCE) and the impact on regional left ventricular mechanics by imaging and pathology techniques.Methods Eleven open-chest animal models of Beagle were employed to collect the short-axis views of mitral annular,papillary muscle and apical level of three complete cardiac cycles using gray-scale imaging at the baseline and blank irradiation 5 min later(transmitting frequency 1.7/3.4 M Hz,mechanical index 1.0).After that,5 ml of SonoVue was gotten a shot by intravenous bolus injection,the heart was exposed by ultrasonic wave for 5 min continuously,and then the same images collected were at the point-in-time irradiation immediately,20 min,40 min and 60 min later.The short-axis circumferential strain and strain rate,radial strain and strain rate were measured and calculated by EchoPAC multi-parameter workstation,meanwhile including conventional of cardiac function.All the dogs were killed after the experiments and the myocardium was harvested for HE staining and observed with transmission electron microscope for the tissue microstructure.Results①Conventional parameters of cardiac function:there was no significant difference before and after MCE in the heart rate,blood pressure,ejection fraction,left ventricular end-systolic volume and end-diastolic volume,stroke volume,cardiac output,mitral flow spectrum prior to the E/A,tissue Doppler mitral annular e/a and E/e ( P ＞0.05).During the whole process of experiment,the dogs’ vital signs were stable.②Compared the segmental circumferential strain and strain rate,radial strain and strain rate between baseline and each treatment groups,these parameters had a trend of increase in most segments,but the difference was not statistically significant in most segments (P ＞0.05).③HE staining at the light microscope demonstrated a small amount of myocardial cell infiltration of inflammatory cells near the outer membrane (21.2％),and very few part of the muscle fibers dissolved and fractured (6.1％).④The section of transmission electron microscope showed all the structures were normal except that a small amount of endothelial cells were mild swelling,some red blood cells were leaked,some myofilaments were regional dissolved,the relevance ratio were 28.6 ％,42.9 ％ and 21.4 ％ respectively,and the abnormal area was less than 10％ of the entire field of vision.ConclusionsMCE has no significant impact for the global function of heart and the regional mechanical state,and furthermore there is no serious pathological damage on the myocardium.

Objective To express mouse IFN-λ2 stably and study its biological activity. Methods Full-length of mIFN-λ2 cDNA was obtained by using RT-PCR from cells of mouse spleen stimulated by ve-sicular stomatitis virus(VSV) and then subcloned to eukaryotic expressing vector PCAGG-EGFP. The recom-binant was transfected into CHO cells. VSV * GFP-B16 system was used to measure the antivirus activity. The constructed cell line MDBK-Mxp-Luc was used to study the character of Mx1 protein induced by the mIFN-λ2. Results The recombinant pMD18-T-mIFN-λ2 was digested by two kinds of enzyme, Sac I and Xho I, to produce the fragment was of 582 bp, and of which the sequence analysis of sequence shows it was entirely consistent with the nucleotide sequences reported in GenBank. PCAGG-EGFP-mIFN-λ2 eukaryotic expressing vector was constructed successfully and expressed stably in CHO cells, and the mRNA of mIFN-λ2 was verified expressing in CHO-PCAGG-EGFP-mIFN-λ2 cell line by RT-PCR. The antivirus activity of in the supernatant secreted by the CHO-PCAGG-EGFP-mIFN-λ2 cell line was 10~4 AU/ml. The mIFN-λ2 pro-tein can could induce the expression of the antivirus protein Mx1, and the expression of Mx1 protein induced by mIFN-λ2 enhanced with time going, 9 to 12 hours achieved the peak, 24 hours vanished. Conclusion Gene cloning of mIFN-λ2 was successful. The eukaryotic expressing vector of mIFN-λ2 was constructed suc-cessfully and expressed stably in CHO cells, and its product has obvious antivirus activity in vitro. And the antivirus activity of the product was closely correlated with inducing expression of antivirus protein Mx1.

Objective To evaluate the mechanical characteristics of systolic left ventricular(LV) transmural torsion in different LV electro-mechanical patterns using speckle tracking imaging. Methods Five open-chest canine models were employed for the acquirement of the basal, apical short-axis and four-chamber views of LV during baseline(BASE) and right atrial appendage(RAA), right ventricular apical (RVA), left ventricular lateral wall (LVL) and left ventrieular apical (LVA) pacing. Subendocardial (subend),subepicardial(subepi) and bulk rotation angle(RA) and segmental angle excursion(AE) at basal and apical level were analyzed using a dedicated workstation. LV torsion at different layers and bulk and global LV ejection fraction (EF) were calculated. Results ① There were no significant difference of transmural torsion and RA at basal and apical level between BASE and RAA pacing (P>0.05);② LV torsion of subend, subepi and bulk during RVA pacing were lower than those during RAA pacing(P0.05);LV torsion of subend and bulk during LVA pacing were lower than those during RAA pacing(P0.05);LV RA of subend,subepi and bulk at basal level during RVA and LVA pacing were lower than those during RAA pacing (P<0.05); ③ For normal electro-mechanical pattern, LV torsion of subend were significant higher than that of subepi(P<0.05), there only were a higher tendency for all pacing models (P>0.05); ④AE of segments near the pacing site decreased during different ventricle paeings (P<0.05); ⑤At BASE and during RAA pacing, LV bulk and subepi torsion were positively correlated to EF; RA of subend,subepi and bulk at basal level were positively correlated to EF. Conclusions LV transmual torsion are significantly depressed during RVA and LVA pacing. There is a spatial co-relationship between LV EF and torsion and rotation of bulk and subepi at basal level in normal LV electro-mechanical patterns.

Objeetive To evaluate the changes of left ventricular(LV) global and segmental volume, LV outlet pressure and their co-relationship, and to access LV global and segmental systolic function and mechanical asynchrony in different LV electro-mechanical patterns using full volume three-dimensional echocardiography(3DE). Methods Nineteen open-chest canine models were employed for the acquirement of LV full volume dynamic 3DE imaging during right atrial appendage (RAA), right ventricular apical (RVA), LV lateral wall(LVL) and LV apical(LVA). LV outlet end-systolic pressure(ESP) was recorded simultaneously. End-systolic volume (ESV), end-diastolic volume (EDV), global and segmental ejection fraction(EF) and systolic dyssynchrony index(SDI) of LV were measured and calculated using a dedicated workstation. The average ascending rate of LV pressure during systole(+ dp/dt) and the average descending systolic pressure(ESP), + dp/dt and - dp/dt during RVA pacing were lower than those during RAA pacing (P <0.05). SDI during RVA pacing was higher than that during RAA pacing(P<0.05). ESP, + dp/dtand - dp/dt during LVL and LVA pacing were lower than those during RAA pacing (P <0.05). There and LVA pacing was higher than that during RVA pacing (P <0.05),SD1 during LVL pacing was lower than that during RVA pacing (P <0.05), there was no significant difference of SDI between RVA and LVA and LVL pacing. Segmental EF of septum and apex during LVI. pacing were higher than those during LVA pacing (P <0.05). @Segmental EF of anterior and post septum and all apical segments (except lateral wall) during RVA pacing were lower than those during RAA pacing (P <0.05). Segmental EF of lateral and anterior wall during I.VI. pacing were lower than those during RAA pacing (P <0.05). Segmental EF of anterior wall and anterior septum during LVA pacing were lower than those during RAA parameters. Conclusions The global and minority segmental systolic function of LV during RAA pacing could be reduced compared with normal sinus rhythm. All the ventricular pacing worsen LV systolic and diastolic function compared with RAA pacing. LV systolic function during LVL pacing was superior to RVA pacing. During ventricular pacing,the systolic function at nearby segments of the pacing site was depressed.

Objective To assess subendocardial systolic circumferential strain(CS),radial strain(RS)and radial displacement(RD)of left ventricle(LV)in short-axis view and LV global systolic function in open-chest canine model with acute myocardial ischemia using velocity vector imaging(VVI),and to establish their spatial correlationships.Methods Left anterior descending coronary artery(LAD)was ligated for 20 minutes to induce acute myocardial ischemia in 12 open-chest canine model.At baseline and 20 minutes after ischemia,two-dimensional dynamic gray-scale images of three standard left ventricular short-axis views at the levels of mitral annulus,papillary muscle and apex and the images of LV apical fourchamber and two-chamber view were acquired and transfefred to VVI workstation for off-line analysis.Peak systolic CS,RS and RD of eighteen segments and of three global short-axis sections of LV were measured at subendocardium.and LV ejection fraction(LVEF)and stroke volume(SV)were calculated using Simpson's method.The differences and correlationships were analyzed between them.Resuls Compared with the value at baseline,LVEF decreased significantly(P＜0.05)after ischemia.The peak systolic subendocardial CS,RS and RD of the affected segments,global CS,RD at papillary muscle and apex views and global RS at apex view were significantly lower than those at baseline after ischemia(P＜0.05).There was a good linear correlationship between the peak systolic CS and RD of 17 segments(except the middle segment of LV lateral wall after ischemia)and each global short-axis level before and after ischemia(r=0.662-0.995,P＜0.05,P＜0.01 or P＜0.001),The peak systolic RS of six segments and each global short-axis level(except the apex level at baseline)was correlated with RD(r=0.580-0.916,P＜0.05,P＜0.01 or P＜0.001);There was not statistical correlationship between global RDs and SV as well as LVEF.Conclusions Subendocardial circumferential strain and radial displacement may sensitively reflect the changes of regional and global myocardial systolic function induced by acute myocardial ischemia.The significant correlationship between subendocardial circumferential systolic strain and radial displacement might indicate that circumferential deformation of myocardium result in the changes of the radial displacement mainly.

Objective To evaluate the mechanical homogeneity pattern of isolated carotid atherosclerotic plaque intima on longitudinal axis view using ultrasonic velocity vector imaging.Methods Fourty six patients with 48 isolated plaques were undergone the high frequency ultrasound scanning,the real-time two-dimensional longitudinal-axis gray scale view at the maximal thickness of the plaque was obtained in three complete cardiac cycles.A dedicated velocity vector imaging(ⅤⅤⅠ)workstation was used for the off-line dynamic two-dimensional gray-scale image analysis and mechanics parameter(i.e.,the peak strain and the absolute difference of the peak strain)assessment at the sites of the upper,middle and down stream separately.The length and direction distribution of the velocity vectors at the carotid atherosclerotic plaque intima were observed.Wilcoxon test was utilized for the comparison of the peak strain and the absolute difference of the peak strain between two sites.Results The chaos phenomenon of velocity vector distribution at the sites of plaque intima occurred significantly differed from those uniform velocity vectors at the reference sites.According to the two groups of the higher strain value side and the lower strain value side on the upper stream and the down stream of the plaque intima,the peak strain at the higher strain value side was significantly higher than the lower strain value side(P=0.000).There was a significantly difference between the absolute difference of peak strain from the higher strain value side to the middle stream point of the plaque intima and the absolute difference of peak strain from the lower strain value side to the higher strain value side of the plaque intima(P＜0.017).Conclusions The length and direction distribution of velocity vectors of the isolated carotid atherosclerotic plaque intima on longitudinal axis view are uneven,the mechanical heterogeneity pattern exists at the plaque intima and could be visualized and quantitatively evaluated using ultrasonic velocity vector imaging.