ABSTRACT
Objective To explore the clinical value of a new tactic with novel dodecafluoropentane (C5F12,DDFP)acoustic vaporizable nano-droplets for the therapy of coronary micro-circulation thrombolysis.Methods Group A was poly butylene succinate buffer solution as blank control;group B was SonoVue microbubbles;group C was DDFP acoustic vaporizable nano-droplets,which were produced with emulsion process by ultrasonic oscillation instrument and rotary evaporator.The size of the nano-droplet was tested by Malvern laser particle size detector and observed with fluorescence microscope.The stability and efficiency of cavitation effect of group C for thrombolysis were tested in an in-vitro artificial vascular system with arterial thrombus model,comparing with group A and B.Weights and pathological sections of the inserted thrombus before and after the thrombolysis in these groups were compared for the thrombolytic efficiency.Results The average size of DDFP nano-droplets were(424.7±30.2)nm.More than 75% of the nano-droplets were ranged from 300-750 nm.The fluorescence microscope showed the DDFP nano-droplets were uniformed round-shaped and stable-structured with favorable dispersity;the nano-droplets had gradually turned into over 3 μm microbubbles under ultrasound irradiation.The thrombus weight loss after thrombolysis in group C[(199.0±35.8)mg,(32.1 ±4.4)%]was significantly larger than those in group A[(30.2 ± 17.8)mg,(5.0 ± 2.4)%]and B[(72.6 ± 20.7)mg,(12.7 ± 2.8)%](all P <0.01). Conclusions DDFP vaporizable nano-droplets with ultrasound irradiation is effective for thrombus elimination in coronary micro-circulation through lasting and stable cavitation effect.
ABSTRACT
Objective To investigate the efficiency of intraclot microbubbles (MB) combined with urokinase (UK) mediated ultrasound (US) thrombolysis.Metho ds Fifty clots prepared by bovine whole blood were equally divided into 5 groups and were treated in a circulation system with collateral circulation tube.The clots were treated by US,MB and UK in group 1,by US and MBingroup 2,by US and UK in group 3 and by UK in group 4.The group5 was the control group without any treatment.The thrombolysis rate of each group was measured and compared.Residual clots were histologically observed with hematoxylin-eosin staining and immunofluorescence.Results The thrombolysis rate of group 1 ([73.64±14.16]％) was significantly higher than group 2 ([47.97± 11.66]％),group 3 ([57.33±8.65]％),group 4 ([50.85±9.63]％),and group 5 ([29.76±18.06] ％,all P＜0.05).Histological examination of the clots in group 1 showed multiple thrombolysis foci with clots collapse,and the degradation of fibrin network was further confirmed by immunofluorescence.Conclusion The intraclot MB mediated US thrombolysis combined with UK can enhance the rate of thrombolysis in vitro experiment.
ABSTRACT
BACKGROUND: Neural stem cell transplantation is an emerging therapeutic option in the recovery of neural lesions and neurodegenerative diseases. Neural stem cell culture and differentiation lay a foundation for the further study. OBJECTIVE: To improve the techniques for the isolation, cultivation, differentiation and identification of neural stem cells, and to explore the biological characteristics of cells. METHODS: The neural stem cells from C57BL/6 fetal rats were isolated and cultured in vitro using neurophere culture method followed by morphological and ultrastucture examination. The growth curve and cell cycle of passage 3 cells were drawn and analyzed. Nestin expression was tested by immunofluorescence. Neural stem cells induced in 1% and 10% fetal bovine serum were identified using anti-GFAP, anti-βⅢ-tubulin and anti-MBP by immunofluorescence. RESULTS AND CONCLUSION: The neurospheres exhibited strong cell proliferation ability. Under transmission electron microscope, there was a high nuclear/cytoplasmic ratio in the neural stem cells, indicating a low differentiation degree. Immunofluorescence analysis revealed that neural stem cells were positive for Nestin. The induced cells were positive for GFAP, βⅢ-tubulin, and MBP, indicating these cells were induced to differentiate into astrocytes, neurons and oligodendrocytes, and there were more neurons in 1% fetal bovine serum than those in 10% fetal bovine serum. In conclusion, we could successfully isolate neural stem cells in C57BL/6 mice, and low concentration of fetal bovine serum contributes to more neurons differentiated from neural stem cells.
ABSTRACT
Purpose After the angiotripsy treatment of tumor,tumor blood vessels have different degrees of regeneration,leading to incomplete tumor necrosis,which may be related to the high expression of HIF-lα.To explore the feasibility of microbubble with HIF-1α antisense oligonucleotide combined with ultrasound inhabit tumor growth.Materials and Methods Twenty-four rabbits with VX2 tumor were randomly assigned to three groups:microbubbles with HIF-1α antisense oligonucleotide plus ultrasound (HMB+US) (n=8),microbubbles plus ultrasound (MB+US) (n=8),therapeutic ultrasound alone without microbubbles (US) (n=8).Pulsed focused ultrasound was delivered directly to the tumor surface for 10 minutes during intravenous infusion of microbubbles with HIF-1α antisense oligonucleotide in the experimental group.The control groups were applied only microbubbles or saline injection.The procedure was repeated every 72 hours until the 30th day.Contrast enhanced US and grey scale ultrasonography were acquired after every treatment to get the tumor perfusion images,size and volume measurements.Results The average maximum diameter of the HMB+US,MB+US,and the US groups grows from (1.13±0.19) cm,(1.17±0.21) cm,(1.22±0.17) cm to (1.60±0.45) cm,(2.11 ±0.57) cm,(3.43 ± 0.71) cm within a 30d-experimental period,respectively.No statistical difference in average diameter was observed among three groups before treatment (P＞0.05).The average maximum diameter of the HMB+US group was significantly smaller than that of the two control groups at the end of experiment (P＜0.05),and the average maximum diameter of the MB+US group was significantly smaller than that of the US group (P＜0.05).Conclusion Microbubbles with HIF-1α antisense oligonucleotide can enhance vascular damage effect ofangiotripsy,which can be a novel method for tumor treatment.
ABSTRACT
Objective To investigate the clinical characteristics and treatment efficacy in newly diagnosed multiple myeloma (MM). Methods The clinical data and treatment methods of 176 patients with newly diagnosed MM were retrospectively analyzed. Results The most common chief complaint in the patients with MM was bone pain. 26.1 % (46/176) patients once experienced misdiagnosis. The overall response rate (ORR) was 65.9 % (116/176), the ORR of bortezomib group (81.0 %, 34/42) was significantly higher than that of M2 regimen group (61.8 %, 34/55) and VAD regimen group (60.8 %, 48/79) (P0.05). The most common adverse reactions included hematologic toxicity, infection and peripheral neurotoxicity. Multiple organ failure was the main cause of death (47.1 %, 16/34). Conclusions The clinical manifestations of MM are complex and diverse, which is easy to be misdiagnosed. Molecular genetic abnormalities are closely related to prognosis. Proteasome inhibitor bortezomib can improve the curative effect and not be affected by renal function. To prolong the survival time of the patients needs to prevent and control the infection and renal insufficiency actively.
ABSTRACT
Objective To explore the effectiveness of different peak negative pressure ultrasound irradiated microbubble destruction on the control of rat blood brain barrier permeability.Methods Thirty healthy SD rats were divided into 5 groups according to different ultrasound pressure level (62 kPa,86 kPa, 1 81 kPa,324 kPa,708 kPa).After intravenous injection of microbubble,the rats were underwent ultrasonic irradiation for 9 minutes,and the contralateral hemispheres were served as controls.The permeability of blood brain barrier was determined by the quantitative analysis of Evans blue and lanthanum nitrate extravasation.Results Quantitative analysis results revealed a leakage in Evans blue about(4.52 ± 0.1 1 )μg/g and (10.56±0.13)μg/g in group 1 81 kPa and 708 kPa,respectively.A wide endothelial cell gap with lanthanum nitrate trace leaked out was shown at the group of ultrasound pressure of 1 81 kPa,and erythrocytes extravasations were found when ultrasound pressure at 708 kPa.Conclusions The pressure amplitude in microbubble enhanced cavitation can effectively regulate and control blood-brain barrier opening in rats.
ABSTRACT
<p><b>BACKGROUND</b>Intravascular microbubble-enhanced acoustic cavitation is capable of disrupting the vascular walls of capillaries and small vessels. This study was designed to investigate the impact of microbubble-enhanced, pulsed and focused ultrasound (MEUS) on the blood perfusion of subcutaneous VX2 tumors in rabbits.</p><p><b>METHODS</b>Subcutaneous VX2 cancers in twenty New Zealand rabbits were treated by combining high-pressure amplitude, pulsed and focused therapeutic ultrasound (TUS) and intravenous microbubble injections. The TUS transducer was operated with a peak negative pressure of 4.6 MPa and a duty cycle of 0.41%. Controls were subcutaneous VX2 cancers treated with TUS or microbubbles only. Contrast-enhanced ultrasound (CEUS) and intravenous Evans Blue (EB) perfusion were performed to assess the tumor circulation. The tumor microvascular disruption was assessed by histological examination.</p><p><b>RESULTS</b>CEUS showed that the tumor circulation almost vanished after MEUS treatment. The average peak grayscale value (GSV) of tumor CEUS dropped significantly from 84.1±22.4 to 15.8±10.8 in the MEUS-treated tumors but no significant GSV changes were found in tumors in the two control groups. The mean tumor EB content of the MEUS-treated tumors was significantly lower than that of the controls. Histological examination found scattered tumor microvascular disruption with intercellular edema after MEUS treatment.</p><p><b>CONCLUSION</b>The tumor circulation of VX2 cancers can be arrested or significantly reduced by MEUS due to microvascular disruption.</p>
Subject(s)
Animals , Rabbits , Contrast Media , High-Intensity Focused Ultrasound Ablation , Liver Neoplasms , Therapeutics , Microbubbles , Ultrasonic TherapyABSTRACT
Objective To analyze the normal hepatic contrast perfusion blocked by ultrasound excited microbubble cavitation using the visual scoring method. Methods Twenty-four healthy New Zealand rabbits were divided into the microbubbles group (MB + US), the simple ultrasound group (US) and the sham group. The MB + US group was insonated by US and intravenous injection of lipid microbubbles. Microbubble was replaced by saline in the US group and sham US exposure was used in the sham group. US contrast liver perfusion imaging was performed before and 0 min,15 min,30 min,45 min,60 min,24 h after treatment in each group. Results The visual perfusion scores of each group before treatment were no statistical difference ( P >0. 05). The visual score of pre-treatment significantly higher than that of post 0 min, 15 min in the MB+ US group ( P<0. 05), but no difference with post 30 min,45 min,60 min and 24 h ( P >0. 05). There were no statistical significance between all the time points of the US and the sham groups. Conclusions Ultrasound excited microbubble cavitation can temporarily and significantly interrupt liver blood perfusion in the visual score analysis.
ABSTRACT
Objective To investigate the effect of microbubble (MB) contrast agents impacted by different parameters such as acoustic pressure, frequency, duration of exposure, and MB concentration under flowing condition. Methods A capillary flow mimic model was set up for observation and analysis of MB displacement and aggregation under stereomicroscope. Results The displacement and aggregation of ultrasonic occurred significantly at the frequency of 2.0 MHz than 1.0 MHz and 0.5 MHz. Under low acoustic pressure, MBs were not visually disrupted but the flow slowed down. The aggregation and deflection applying to MB was stronger in the tube happened at the MB concentration of 7×10~7/ml than 7×10~5/ml, but did not when the concentration rose to 7×10~9/ml because of the high viscosity. The ultrasound exposure time could not affect significantly in displacement and MB aggregation. Conclusion MB contrast agents can be manipulated under some ultrasound parameters. It is expected to be physically modulated in blood vessels, in order to increase targeted adhesions for many therapeutic purposes.