AIMTo study the effects of different acute hypoxia on blood pressure, heart rate and microvessels and free radical in rabbits.

METHODSThe experiment model was carried out with acute hypoxia on two groups of rabbits, using artificial inspiration 12.5% O2 and 87.5% N2, 8.5% O2 and 91.5% N2 (equivalent to altitudes of some 4 000 m and 6 500 m) keeping hypoxia for 5, 10, 15, 20 min. During the course of it, the changes of blood pressure, heart rate and microvessels response, superoxide dismutase (SOD), malondialdehyde (MDA) were recorded accordingly.

RESULTS(1) systolic pressure was slightly up, then down in 5 mins. Diastolic pressure was significantly down (P < 0.05) in 20 min. (2) Heart rate showed reduced and prolonged, particularly in 8.5% hypoxia group (P < 0.05). (3) Vas bores of microvessle expanded (P < 0.05) and the blood stream became slow gradually (P < 0.05, P < 0.01) in following acute hypoxia time. (4) SOD was significantly down (P < 0.05), MDA was significantly increased (P < 0.05) in 20 mins.

CONCLUSIONAcute hypoxia could cause the blood pressure and heart rate to decrease, vas bore of microvessle to expand, the blood circulation to slow down and free radicals would increase.

Animals ; Blood Pressure ; Free Radicals ; metabolism ; Heart Rate ; Hypoxia ; metabolism ; physiopathology ; Microvessels ; physiopathology ; Rabbits

OBJECTIVE: We wanted to investigate the radial peripapillary capillary (RPC) network in patients with Bietti crystalline dystrophy (BCD). METHODS: We compared RPC densities in the disk and different peripapillary regions, obtained using optical coherence tomography angiography in 22 patients with BCD (37 eyes) and 22 healthy subjects (37 eyes). The BCD group was then divided into Stage 2 and Stage 3 subgroups based on Yuzawa staging, comparing the RPC densities of the two. RESULTS: The disk area RPC density was 38.8% ± 6.3% in the BCD group and 49.2% ± 6.1% in the control group ( P < 0.001), and peripapillary region RPC density was significantly lower in the BCD group than in the control group (49.1% ± 4.7% and 54.1% ± 3.0%, respectively, P < 0.001). There were no significant RPC density differences between the tempo quadrant and inside disk of Stages 2 and 3 subgroups; the other areas showed a significantly lower RPC density in Stage 3 than in Stage 2 BCD. CONCLUSION The BCD group RPC density was significantly lower than the control group. The reduction of RPC density in the tempo quadrant occurred mainly in the Stage 1 BCD. In contrast, the reduction of RPC density in superior, inferior, and nasal quadrants occurred mainly in Stage 2.
Adult ; Aged ; Angiography ; Corneal Dystrophies, Hereditary/physiopathology* ; Female ; Humans ; Male ; Microvascular Density ; Microvessels/physiopathology* ; Middle Aged ; Retinal Diseases/physiopathology* ; Retinal Vessels/physiopathology* ; Tomography, Optical Coherence

No abstract available.
Coronary Artery Disease/*therapy ; *Coronary Circulation ; Coronary Vessels/*physiopathology ; *Endothelial Progenitor Cells ; Female ; Humans ; Male ; Microvessels/*physiopathology ; Percutaneous Coronary Intervention/*instrumentation ; *Re-Epithelialization ; *Stents

OBJECTIVETo determine whether mobilized peripheral blood mononuclear cells (M-PBMNCs) obtained from patients with diabetes was impaired in therapeutic neovascularization in limb ischemia, and to explore the pathological mechanisms of the impairment.

METHODSEndothelial progenitor cells (EPC) were cultured in EGM-2MV, and then characterized by uptake of 1, 1-dioctadecyl-3, 3, 3, 3-tetramethylindocarbocyanine-labeled acetylated low density lipoprotein (Dil-AcLDL) and binding of ulex europaeus agglutinin (UEA). The number of EPC was compared between M-PBMNCs obtained from diabetic patients and those from normal subjects. M-PBMNCs obtained from diabetic patients, M-PBMNCs obtained from normal controls, or PBS were injected into the ischemic limbs of streptozotocin-induced diabetic nude mice. The limb blood perfusion was detected by laser Doppler blood perfusion imaging between these three groups in the following 1, 3, 7, 14, 21, and 28 days. Ambulatory score and ischemia damage were evaluated in the following 4 weeks. Capillary/fiber ratio was detected by CD31 or BS-1 lectin, and arteriole density was detected by alpha-smooth muscle actin (alpha-SMactin).

RESULTSThe number of EPC from diabetic patients were positively correlated with the blood perfusion (R = 0.486, P < 0.05) and capillary density (R = 0.491, P < 0.05), and the EPC number in diabetic patient were negatively correlation with their disease courses (R = - 0.587, P < 0.05). Transplantation of diabetic M-PBMNCs augmented the blood perfusion of ischemia hindlimbs, increased the capillary and arteriole densities, and promoted the collateral vessel formation. However, all the improvements were less significant in the diabetic patients than in the non-diabetic patients (P < 0.05).

CONCLUSIONDiabetes decreased the capability of M-PBMNCs to augment neovascularization in ischemia.

Animals ; Diabetes Mellitus ; blood ; Diabetes Mellitus, Experimental ; physiopathology ; Endothelial Cells ; physiology ; transplantation ; Extremities ; blood supply ; Humans ; Ischemia ; physiopathology ; Leukocytes, Mononuclear ; physiology ; transplantation ; Mice ; Mice, Nude ; Microvessels ; physiopathology ; Neovascularization, Physiologic ; Stem Cell Transplantation

OBJECTIVETo evaluate the value of endometrial microvessel density (MVD) in assessing the endometrial receptivity during the peri-implantation period.

METHODSA total of 104 patients undergoing in vitro fertilization and embryo transfer (IVF-ET) treatment were analyzed retrospectively. The subjects were divided into clinical pregnancy group (50 cases) and nonpregnant group (54 cases) according to the IVF-ET outcome. Endometrial tissues were collected 7 days after the natural ovulation prior to IVF-ET for measurement of the endometrial MVD using electron microscopy, which was analyzed in relation to the clinical outcome of the treatment.

RESULTSThe endometrial MVD was significantly higher in the clinical pregnancy group than in the nonpregnant group [(4.12∓1.84)% vs (3.46∓1.26)%, t=-2.127, P=0.036). ROC curve analysis showed that the MVD had an area under the curve slightly over 0.5 (0.598) for predicting clinical pregnancy, suggesting a poor specificity in predicting the clinical outcome of the treatment.

CONCLUSIONIn IVF-ET cycles, the endometrial MVD during the peri-implantation period is helpful for assessing the endometrial receptivity, but the specificity remains low.

Adult ; Embryo Implantation ; physiology ; Embryo Transfer ; Endometrium ; blood supply ; physiology ; Female ; Fertilization in Vitro ; Humans ; Infertility, Female ; diagnostic imaging ; physiopathology ; therapy ; Microvessels ; ultrastructure ; Retrospective Studies ; Ultrasonography

It has been known that the renal microvasular lesions could aggravate the progress of glomerular sclerosis and tubulo-interstitial fibrosis in chronic kidney diseases. Modern pharmacological studies indicated that the two traditional Chinese herbs, Astragalus membranaceus and Angelica sinensis, could improve micorvascular lesions through multiple mechanisms, including increasing local renal blood flow to lessen the hypoxic renal injury, promoting the recovery of renal blood flow and glomerular filtration rate after ischemia-reperfusion, modulating the imbalance of vaso-activators such as nitric oxide and angiotensin, increasing the expression of vascular epithelial growth factor and inhibiting the release of the intracellular calcium ion and promoting DNA synthesis in endothelial cells to improve the function of endothelial cells. These evidences suggest that Astragalus membranaceus and Angelica sinensis may retard the progress of renal diseases through the above-mentioned mechanisms.
Angelica sinensis ; chemistry ; Animals ; Astragalus membranaceus ; chemistry ; Drugs, Chinese Herbal ; therapeutic use ; Humans ; Kidney ; blood supply ; drug effects ; Kidney Diseases ; drug therapy ; physiopathology ; Microvessels ; drug effects

Systemic sclerosis is a connective tissue disease characterized by alterations in microvascular structure and function. In these patients, numerous studies have demonstrated a relationship between capillary morphology and peripheral blood perfusion. Nailfold videocapillaroscopy reveals the peripheral microvascular morphology and thus allows classification and scoring of capillary abnormalities with respect to different microangiopathy patterns (early, active, and late). Laser Doppler flowmetry and laser speckle contrast analysis can be used to estimate cutaneous blood flow through microvessels and to assess and quantify blood perfusion at peripheral sites. These two methods are also used to identify changes in digital blood perfusion after the infusion of vasodilators.
Blood Flow Velocity ; Humans ; *Laser-Doppler Flowmetry ; *Microcirculation ; Microscopic Angioscopy/*methods ; Microvessels/*pathology/*physiopathology ; Nails ; Predictive Value of Tests ; Regional Blood Flow ; Scleroderma, Systemic/*diagnosis/pathology/physiopathology ; Skin/*blood supply ; Vasodilator Agents/diagnostic use ; *Video Recording

OBJECTIVETo study the effect of Suxiao Jiuxinwan on angiogenesis in experimental myocardial infarction rats.

METHODThe animal model was established by ligation of anterior decending coronary artery and the infarction areas as well as microvascular density (MVD) in the marginal infarction area of the myocardial infarction rats were observed.

RESULTInfarction areas in high dose and low dose Suxiao Jiuxinwan groups were significantly different from that of model group (P<0.01), and this effect was similar with the positive model group and had the dosage-dependent speciality. The microvascular density (MVD) of marginal infarction areas in Suxiao Jiuxinwan high and low groups was much more elevated than that in the sham group (P<0.05), and the effect of Suxiao Jiuxinwan high group was similar with that of the positive control group. But the difference between the Suxiao Jiuxinwan high and the low goups was not significant.

CONCLUSIONSuxiao Jiuxinwan has the obvious effcet on angiogenesis in eperimental myocardial infarction rats.

Animals ; Disease Models, Animal ; Dose-Response Relationship, Drug ; Drugs, Chinese Herbal ; pharmacology ; therapeutic use ; Male ; Microvessels ; drug effects ; physiopathology ; Myocardial Infarction ; drug therapy ; physiopathology ; Neovascularization, Pathologic ; drug therapy ; Rats

Animals ; Burns ; drug therapy ; metabolism ; physiopathology ; Drugs, Chinese Herbal ; pharmacology ; therapeutic use ; Female ; Male ; Mesentery ; blood supply ; Microvessels ; drug effects ; physiopathology ; Phytotherapy ; Rats ; Rats, Sprague-Dawley ; Superoxide Dismutase ; metabolism ; Trillium ; chemistry

OBJECTIVETo explore the feasibility of therapeutic angiogenesis in myocardial infarction induced by hepatocyte growth factor (HGF) mediated by ultrasound-targeted microbubble destruction.

METHODSForty Wistar rats were divided into 4 groups after the models of myocardial infarction were established: HGF + ultrasound + microbubble (HGF + US/MB) groups, HGF and ultrasound (HGF + US) group, HGF and microbubble (HGF + MB) group, and surgery alone (SA) group. Ultrasound-targeted destruction microbubble loaded with HGF gene with ECG trigger was performed in HGF + US group. Microbubble loaded with HGF gene was infused intravenously in HGF + MB group, and normal saline were infused in SA group. All rats were killed 14 days after transfection. The CD34 expression was detected by immunohistochemistry (IHC), and microvessel density (MVD) was counted in high power field. The HGF expression on myocardium was detected by ELISA, and the correlation between the contents of HGF and MVD in myocardium was analyzed.

RESULTSIHC results showed that CD34 expressions, shown as brown granules, were located on the membrane and endochylema of vascular endothelial cells. The MVD in HGF + US/MB group [ (266.9 +/- 39.8) /HPF] were highest among all the groups. The contents of HGF in myocardium were highest in HGF + US/MB group [(5.54 +/- 0.81) ng/g], and the contents of HGF in anterior wall were significantly higher than those in posterior wall (P < 0.05); the difference was also significant when compared with others groups (P < 0.01). The correlation analysis showed the contents of HGF was positively correlated with MVD in myocardium.

CONCLUSIONUltrasound-targeted microbubble destruction can effectively deliver HGF into the infracted myocardium and facilitate angiogenesis, which provides a novel way in the gene therapy of myocardial infarction.

Animals ; Drug Delivery Systems ; Hepatocyte Growth Factor ; administration & dosage ; therapeutic use ; Microbubbles ; Microvessels ; drug effects ; physiopathology ; Myocardial Infarction ; diagnostic imaging ; drug therapy ; physiopathology ; Neovascularization, Physiologic ; drug effects ; Rats ; Rats, Wistar ; Ultrasonics ; Ultrasonography