Objective To study the research advance in tracheal allografts undergoing revascularization and reepithelialization. Methods Therecent literature concerned was reviewed. The tracheal allografts are embedded in the omentum, which they were revascularized and reepithelialized by planting in self-epithelia, then the allografts with their omental pedicles were transplanted orthotopically to the cervical or the thoracic portion of the trachea. Results Compared withthe onestage tracheal allograft approach using the greater omentum, the twostage approach could increase the successful rate of revascularization and reepithelialization, and made the allografts accord with their physiology. Conclusion If the approach is successful, it can reduce graft-rejection, prevent graft-collapse and increase graft-viability after tracheal allograft.
PURPOSE:To investigate the spatial and temporal relation of fibronectin(Fn),basic fibroblast growth factor(b-FGF)and astrocytes with the retinal vascular developmemt of human fatuses. METHODS:The retinas of 86 human fetuses from 13th week to 40th week were studied by immunohistochemical methods and light microscopy. RESULTS:Fn immunoreativity was localized in spindle cells ,vascular endothelial cells and extracellular matrix ahead of the spindle cells,vascular endothelial cells,ganglion cells and cone cells were b-FGF immunopositive. The b-FGF immunoreactivity in ganglion cells and cone cells appeared earlier than the vascularization nearby.Astrocytes migrated to ora serrata in close association with the spindle cells.and sent numerous processes to ensheath the blood vessels formed in two processes of retinal vascuiarlzation. CONCLUSION:These results suggest that Fn ,b-FGF and astrocytes were involved in modulating both of two processes of retinal vascularizalion. （Chin J Ocul Fundus Dis,1996,12:180-182）
ObjectiveTo explore the inhibition effect of Cysteine-rich 61(CCN1;Cyr61) specific siRNA expression vector on RNV in a mouse model of oxygen-induced retinopathy (OIR). MethodsOne hundred and twenty healthy C57BL/6J mice were chosen and randomly divided into the experimental group and control group, with 60 mice in each group. The experimental group was intravitreously injected with CCN1siRNA recombinant plasmids. The control group was injected with vector plasmids. Adenosine diphosphate-ase stained retina flat-mounts was performed to assess the retinal vascular profiles, retinal section with HE staining was applied to count the number of new vascular cell nuclei and the protein and mRNA expression of CCN1 and vascular endothelial growth factor (VEGF) were detected by immunohistochemistry, Western blot and Real-time RT-PCR. ResultsCompared with control group, regular distributions, good branches and reduced density of retinal neovascularization were observed in the experimental group. The number of nucleus of vascular endothelial cells breaking through the inner limiting membrane was obviously less in the experimental group than that in the control group (t=8.756, P < 0.05). The expression of CCN1 and VEGF were obviously decreased in the experimental group compared with the control group (all P < 0.05). ConclusionThe development of RNV of ROP can be markedly inhibited by RNA interference targeting CCN1, and CCN1siRNA may provide an effective method for preventing vascular proliferative retinopathy.
ObjectiveTo observe the effect of adenovirus-mediated Tum5 (rAd-Tum5) inhibiting retinal neovascularization (RNV) of oxygen-induced retinopathy (OIR) mouse model. MethodsThe OIR model was induced in 96 C57BL/6J mice aged of 7 days according to the literature. These mice were divided randomly into control group, OIR group, OIR rAd-green fluorescent grotein (GFP) group and OIR rAd-Tum5 group, each group had 24 mice. The rAd-GFP and rAd-Tum5 were injected into the vitreous cavity of mice aged of 12 days in OIR rAd-GFP group and OIR rAd-Tum5 group, respectively. Meanwhile, OIR group and the control group received the injection of physiological saline solution of same volume. The relatively non-perfusion area was evaluated by fluorescence angiography, and the number of pre-retinal nucleus breaking through internal limiting membranes was observed by hematoxylin-eosin staining. The expression of vascular endothelial growth factor (VEGF) was estimated by immunofluorescent (IF) and Western blot. ResultsThe retinal avascular areas of all groups were significantly different (F=61.224, P<0.01). The retinal avascular area of the rAd-Tum5 group was decreased significantly comparing with that in the OIR group and rAd-GFP group (P<0.01). However, there are no significant differences between the OIR group and rAd-GFP group (P=0.827). The number of pre-retinal nucleus breaking through ILM of all groups was significantly different (F=635.738, P<0.01), but no significantly difference was observed in OIR group and rAd-GFP group (P=0.261). Significant differences could also been seen between OIR rAd-Tum5 group and OIR group as well as OIR rAd-Tum5 group and OIR rAd-GFP group (P<0.01). The results of IF and Western blot indicated that expression of VEGF in the OIR group and rAd-GFP group was obviously up-regulated, compared with that in the control group. But the expression was declined in the rAd-Tum5 group compared with that in the OIR group and rAd-GFP group. ConclusionTum-5 peptide can efficiently prevent RNV probably by down-regulating expression of VEGF.
Objective To investigate the effects of hand assistant laporoscopic splenectomy plus pericardial devascularization on systemic stress responses. Methods Forty patients with cirrhotic portal hypertension were selected， 20 cases of which were underwent hand assistant laparoscopic splenectomy plus pericardial devascularization (LAP group)， and the other 20 were underwent open splenectomy plus pericardial devascularization (OP group). The levels of blood glucose （BG）, insulin (Ins), triiodothyronine （T3）, tetraiodothyronine （T4）, corticosteroid （CS） and other related clinical data were measured before operation and on day 1-3 after operation, which were compared between two groups. Results There was no statistical significance between two groups on those levels before operation. On day 1 after operation， BG and CS level in both two groups were higher than those before operation (P＜0.05), but they were recovered on day 2 after operation in LAP group (Pgt;0.05), and on day 3 after operation in OP group (Pgt;0.05). BG and CS level in OP group were markedly higher than those in LAP group on day 2 after operation (P＜0.05). On day 1 after operation， Ins, T3 and T4 level of two groups were lower than those before operation (P＜0.05), but they were recovered on day 2 after operation in LAP group (Pgt;0.05) and on day 3 after operation in OP group (Pgt;0.05). Ins, T3 and T4 level in OP group were lower than those in LAP group on day 2 after operation (P＜0.05). There was no significant difference in operation time between two groups (Pgt;0.05). But laparoscopic surgery had more advantages than conventional open surgery such as reducing bleeding quantity in operation, shortening recovery time of bowel and urinary bladder function and the length of stay. Conclusion Compared with laparotomy, the laparoscope not only imposes less impact on physical stress system, but also makes recovery after operation more quickly.
ObjectiveTo study the inhibitory effects of pigment epithelium derived factor (PEDF) on oxygen-induced retinal neovascularization in mice, and to investigate the possible involvement of interleukin-1β (IL-1β) in the neovascular-inhibitory function of PEDF. Methods A total of 140 postnatal day (P)7 C57BL/6 mice were randomly divided into normal control group, oxygen-induced retinopathy (OIR) model group, PEDF treatment group and PBS treatment control group. All mice except normal control group with their mothers were exposed to (75±2)% oxygen environment for 5 days and then kept in room air for another 5 days to establish the OIR model. Mice in normal control group were kept in room air only. At P12 and P14, respectively, mice in PEDF treatment group received intravitreous injections of 1 μl PEDF (2 μg/μl), while PBS treatment control group received the same volume of PBS (10 mmol/L, pH7.4).All mice were euthanized at P17 and eyes were isolated. The changes of retinal vessels were observed on retinal flat mounts and cryosections by fluorescence microscopy. Retinal specimens were prepared for IL-1β protein and mRNA analysis by Western blot and real time fluorescence quantitative reverse transcription-polymerase chain reaction (Real-time RT-PCR). ResultsChanges of retinal vessels had been viewed by fluorescence microscopy on flat-mounted retina, the relative retinal neovascularization areas were significantly increased in OIR model group compared with normal control group (t=15.02, P < 0.01), and the relative retinal neovascularization areas were obviously smaller in PEDF treatment group than those in PBS treatment control group (t=5.96, P < 0.01). Fluorescence staining revealed that retinal vascular tufts were extending from outer plexiform layer (OPL) to ganglion cell layer (GCL) of the retina along with multiple interconnections; Neovascular tufts in OIR model group and PBS treatment control group were presenting distinctly more than those of normal control group and PEDF treatment group. The specific expression levels of IL-1β protein in retinas of OIR mice by Western-blot analysis were higher than those of normal control group(t=3.35, P < 0.05), While these of PEDF treatment group showed a considerable decline in comparison with PBS treatment control group (P < 0.01), and there were no difference in normal control group and PEDF-treated group (F=11.764, P > 0.05). Similarly, expression levels of IL-1β mRNA tested by Real-time RT-PCR were obviously increased in the OIR model group when compared to normal control group(t=4.43, P < 0.01). After treated with PEDF, expression levels of IL-1β mRNA showed a considerable decrease when compared to PBS treatment control group (P < 0.01), and there were no difference in normal control group and PEDF-treated group (F=11.15, P > 0.05). ConclusionsPEDF can inhibit oxygen-induced retinal neovascularization. The mechanism may be related to that PEDF can downregulate the expression of IL-1β in retina.
Progress in the treatment of acute myocardial infarction (AMI)， chronic coronary artery disease and their immediate complications has led to an increasing number of surviving patients with residual left ventricular dysfunction. It has been shown that viable myocardium in post-AMI patients and chronic heart failure patients plays an important role in predicting their prognosis and making clinical decisions. Viable myocardium refers to myocardium with reversible contractile dysfunction that occurs in coronary ischemia or after ischemia-reperfusion, but still has contractile reserve. Myocardial microvascular integrity is in correspondence with myocardial viability. Myocardial contrast echocardiography can evaluate the microvascular integrity of myocardial dysfunctional areas in patients with AMI or chronic coronary artery disease, detect viable myocardium， predict the potential for functional recovery in dysfunctional areas following reperfusion， and provide clinicians with valuable information for individualized treatment.
Objective To investigate the effects of celecoxib-poly lactide-co-glycolide microparticles (CEL-PLGA-MS) on rat retina after intravitreal injection. Methods A total of 32 male Brown Norway rats were randomly divided into CEL-PLGA-MS group and celecoxib group, 16 rats in each group. The rats in CEL-PLGA-MS group were divided into four dosage group, four rats in each group, which received intravitreal injection of PLGA with celecoxib at the concentration of 40, 80, 160, 320 mu;mol/L, respectively. The rats in celecoxib group were divided into four dosage group, four rats in each group, which received intravitreal injection of celecoxib at the concentration of 40, 80, 160, 320 mu;mol/L, respectively. Phosphate buffer solution (PBS) was injected in two rats as PBS control group. Two rats as normal control group received no treatment. The difference of retinal thickness among groups was measured by optical coherence tomography (OCT). The morphological and histological change of retina was evaluated under light microscope and transmission electron microscope. Results There was no difference of retinal thickness between normal control group and PBS control group (F=0.12,P＞0.05). At the first week after injection, the retinal thickness of CEL-PLGA-MS group and celecoxib group were thicker than that in normal control group and PBS control group (F=9.62, 46.13;P＜0.01). The retinal thickness of celecoxib group was thicker than that in CEL-PLGA-MS group (F=165.15,P＜0.01). The retinal thickness was estimated equal among 40, 80, 320 mu;mol/L dosage groups in CEL-PLGA-MS group (F=4.79,P＜0.01). The retinal thickness of 160, 320 mu;mol/L dosage group were thicker than that in 40, 80 mu;mol/L dosage group in celecoxib group (F=28.10,P＜0.01). At the second week after injection, there was no difference of retinal thickness between CEL-PLGA-MS and celecoxib group (F=3.79,P＞0.05); the retinal thickness of CEL-PLGA-MS and celecoxib group became thinner gradually compare to the first week after injection (F=7.28, 103.99; P＜0.01). At the fourth week after injection, the retinal thickness of celecoxib group was thicker than that in CEL-PLGA-MS group (F=19.11,P＜0.01). The retinal thickness of CEL-PLGA-MS group was approximately the same to normal control group and PBS control group (F=2.02,P＞0.05). The retinal thickness of celecoxib group was thicker than that in normal control group and PBS control group. No considerable abnormality of the retina was seen by light microscope and the retinal thickness corresponded with the values measured by OCT at the first week after injection. The abnormal structures of the retina were seen in 160, 320 mu;mol/L dosage group of celecoxib group and inner changed evidently by the transmission electron microscope. Disordered arrangement of microfilaments, dilated microtubule and some mitochondria vacuolation were observed in 320mu;mol/L dosage group of celecoxib group. Others changed slightly. Conclusions CEL-PLGA-MS has less toxicity on the retina than free-celecoxib after intravitreal injection. The safety of intravitreal injection with CEL-PLGA-MS is better than celecoxib.
Two-hundred and forty-five eyes of 240 cases of branch retinal vein occlusion (BRVO) were analysed to determine the risk factors influencing the development of retinal neovascularization (NV).There were 208 eyes with major BRVO, 37 eyes with macular BRVO, 79 eyes with major BRVO developed NV, and the incidence of NV in this series was 37.9%.The incidence of vitreous hemorrhage in these eyes was 15.9%(39 eyes). The risk factors influencing the development of retinal NV in BRVO seem as follows: (]) the extent of retinal capillary nonperfusion area, (2)inefficiency of arterial infusion, (3) the extent of venous block at the arteriovenous crossing, (4) the duration of follow-up since onset of BRVO, and (5) the lack of collateral formation, Because BRVO has a long natural history, it is recommended that the patients should be followed-up for a long time If the vessels at peripheral retina closed, fluorescein angiography should be performed without hesitation and if the nonperfusion area is greater than 20-30 disc area, one should follow the patient carefully.As soon as the new vessels appear, laser photocoagulation should be applied without delay. （Chin J Ocul Fundus Dis,1994,10:67-70）
ObjectiveTo summarize the application status of hypoxia mimetic agents in bone tissue engineering.MethodsThe related literature about the hypoxia mimetic agents in bone tissue engineering was reviewed and analyzed. And the application status and progress of hypoxia mimetic agents in bone tissue engineering were retrospectively analyzed.ResultsHypoxia mimetic agents have the same effect as hypoxia in up-regulating the level of hypoxia inducible factor 1α (HIF-1α). The combination of hypoxia mimetic agents and scaffolds can up-regulate the level of HIF-1α in bone tissue engineering, thus promoting early vascularization and bone regeneration of the bone defect area, which provides a new idea for using bone tissue engineering to repair bone defect. At present, the commonly used hypoxia mimetic agents include iron chelating agents, oxoglutarate competitive analogues, proline hydroxylase inhibitors, etc.ConclusionHypoxia mimetic agents have a wide application prospect in bone tissue engineering, but they have been used in bone tissue engineering for a short time, more attention should be paid to their possible side effects. In the future research, the hypoxia mimetic agents should be developed in the direction of higher targeting specificity and safety, and the exact mechanism of hypoxia mimetic agents in promoting bone regeneration should be further explored.