Adriamycin is an effective and broad-spectrum anthracycline antineoplastic agent.However,long-term therapy with adriamycin is associated with a high incidence of cumulative and irreversible cardiomyopathy. Mechanisms about adriamycin-induced cardiotoxieity are complicated, including oxidative stress,mitochondrionopathy,cardiac apoptosis,and so on.For the past few years,a series of measures aye used,which attenuate the cardiotoxicity and uninfluence the antitumor effects.The review focuses on the mechanism and prevention of adriamycin-induced cardiotoxicity in order to improve the long term survival rate of neoplastic patient.

0 05) 3 hours after myocardial infarction,and remarkably decreased (P

Objective To inquire into the effects of cardiac ? 1 -adrenergic receptor on myocardial remodeling and modulating calcium channel. Methods The models of myocardial remodeling after myocardial infarction in Wistar rats were used to study the expression changes of cardiac collagen subtype Ⅰ,Ⅲ,fibronectin (FN) with immunohistochemistry,and changes of T-type calcium channel,L-type calcium channel and ? 1 -adrenergic receptor mRNA expressions by reverse transcription and polymerase chain reaction(RT-PCR) and in situ hybridization. Cardiac total Ca 2+ was tested by atomic absorption/flame emission spectrophotometer. Results Cardiac collagenⅠ,collagen Ⅲ,FN protein expressions in betaloc group were remarkably decreased (P

Objective To inquire into the correlation of cardiac AT 1 receptor,? 1 receptor with PKC/MAPKs(protein kinase C/mitogen-activated protein kinase) signal transduction pathway during myocardial remodeling.Methods Twenty-four Wistar rats were randomly divided into four groups-sham group,infarcted group,losartan group and betaloc group.Except sham group,left anterior descending coronary artery was ligated for 21 days.In the other three groups,expression changes of cardiac collagen subtype Ⅰ,Ⅲ,fibronectin(FN),c-fos,ERK 1 (extracellular signal-regulated kinase,ERK)and PKC proteins were studied with immunohistochemistry and computer image analysis. c-fos mRNA expression was tested by reverse transcription and polymerase chain reaction(RT-PCR).Results Expressions of collagen Ⅰ,collagen Ⅲ , FN,c-fos,ERK 1 and PKC proteins were significantly enhanced(P

Objective To inquire into T-type calcium channel effects on RyR and IP 3R of sarcoplasmic reticulum in atrial myocytes during atrial fibrillation.Methods Ten dogs underwent continuous rapid atrial pacing (500 beats/min) to create persistent atrial fibrillation.In five rapidly-paced dogs,mibefradil dihydrochloride was given beginning 2 days after pacemaker implantation,continuing until the twenty-fourth week.A group of size-matched dogs (n=5) without given mibefradil was used as a pure atrial fibrillation group.Another group of size-matched dogs (n=5) without pacemaker implantation was used as a control group.Canine atrial myocytes isolated by enzymatic dissociation were used to study T-type Ca 2+ channel blocker effects on expression and function changes of RyR and IP 3R in atrial myocytes by confocal microscopy.Results RyR/IP 3R ratio (0.2965?0.01812) was markedly lower than that of control group (2.7043?0.2293),but there was no difference compared with that of atrial fibrillation group (0.2472?0.1355).Ca 2+transient of atrial myocytes was nremarkably changed (1.3031?0.1056)(P

Objective To inquire into T-type calcium channel effects on atrial electrical remodelling and its mechanisms during atrial fibrillation.Methods Animal experiment was performed in Peking University Pepole's Hospital from Feb.2002 to Oct.2006.Fifteen adult cross-bred dogs were used in the experiment.Ten dogs underwent continuous rapid atrial pacing(500 beats/min)for twenty-four weeks to create persistent atrial fibrillation.In five rapidly-paced dogs,50mg pure powder/day of mibefradil dihydrochloride was given from the second day after pacemaker implantation and continued until the twenty-fourth week.A group of size-matched dogs(n=5)without being given mibefradil was used as a pure atrial fibrillation group.Another group of size-matched dogs(n=5)without pacemaker implantation was used as a control group.Atrial fibrillation duration was determined by electrophysiological study.Canine atrial myocytes were isolated by enzymatic dissociation and intracellular Ca2+ cytosolic transient was studied with confocal imaging.Results (1)The preoperation atrial effective refractory period was 280/90~110 ms.In the twenty-fourth week after rapid atrial pacing,atrial effective refractory period was obviously extended(2000/1400~1700 ms)in the T-type Ca2+ channel blocker group compared with the preoperation one.In the twenty-fourth week,the induced rate of persistent atrial fibrillation was 75% in atrial fibrillation group,whereas the persistent atrial fibrillation occurred in only one case(20%)in the T-type Ca2+ channel blocker group.(2)Intracellular Ca2+ concentration of atrial myocytes was unremarkably changed in control group after blocking L-type Ca2+ channel(1.17?0.09 OD ratio),whereas the intracellular Ca2+ concentration was obviously enhanced(2.35?1.05 OD ratio)(P

40 weeks old SHR did not differ from that in slices of age matched WKY. B max was increased in the same brain region of SHR when compared to WKY. That rats of 4 5 weeks were in prehypertensive stage;rats of 10 12 weeks and above were at the stage of establishing hypertensive stage. Conclusion: The difference between SHR and normotensive rats in 5 HT 1A receptor binding in various brain regions may be related to the development of hypertension. When blood pressure changes,binding capacity of 5 HT 1A receptor in CNS changes accordingly.

Objective:To screen the binding peptide against adenovirus type 7(Ad7) and evaluate the relevance with the ade-novirus receptor .Methods:Binding peptide against Ad 7 was screened by panning the phage display 12 peptides library .The antibody against the selected peptide was prepared and was used to study the binding to the membrane by immunofluorescence technique .Re-sults:Using Ad7 as the target protein , GTS09 peptide was selected from the phage display 12 peptides library by biopanning .GTS09-phage complex could significantly bind Ad 7, with the affinity constant up to 1.93 ×1010 L/mol;at the same time, immunofluorescence showed that antibody of GTS09 could specifically bind to membrane of 293 cell.Conclusion: Antibody against GTS09 peptide could specifically bind to membrane of 293 cell,which shows that the peptide may presumably have homology with the cell receptors of Ad 7.

Objective To investigate the expression and significance of interleukin-1β and C-reactive pro-tein(CRP)in atrial fibrillation(AF).Methods Sixteen mongrel dogs were randomly divided into two groups:pa-cing group(n=8)and control group(n=8).High frequency pacing was performed in the pacing group with perma-nent pacernaker but not in the control group.After pacing for 24 weeks,tissue samples were obtained from the left and right atria.The levels of IL-1βand CRP in atria were detected by immunohistochemistry.Results Compared to the control group,the expression level of IL-1β and CRP were significantly enhanced(P<0.05)in atrial tissues during AF.Conclusion IL-1β and CRP may participate in atrial fibrillation formation and play a role in generation and maintaining the artrial fibrillation.

Objective To investigate the clinical effect of using leukocyte filter to prevent nonhemolytic febrile transfusion reactions(NHFTR) in hematologic patients who were trarisfused erythrocyte suspension. Methods Select 720 inpatients need erythrocyte transfusion and have transfusion records. The patients were randomly divided into investigation group and control group. We made a routine examination and recorded the patients' body temperature, heart rate, blood pressure, respiration rate and transfusion adverse reaction before and after erythrocyte suspeusion transfusion. Results Before blood transfusion, the body temperature of patients between two groups were normal, but after blood transfusion, there were 35 patients with NHFTR in the control group, while only 5 cases in the investigation group which used leucocyte filter, the difference between two groups is significant( P＜0.01 ). The change of the patients' body temperature were compared between two groups before and after transfusion, the changes in the control group was significantly higher than the investigation group( P＜0.01 ). Compared the changes of serum total bilirubin level in all patients before and after transfusion,there was no difference in both groups. The incidence of NHFTR increased with increasing of the transfusion times, but compared with the investigation group,the incidence of the control group was higher significantly(P＜0.01 ). Conclusion Leukocyte filter can prevent the occurring of NHFTR efficiently, enhance the quality of transfusion,guarantee the blood transfusion safety.