OBJECTIVE:To investigate the index of the rejection of lJle retinal pigment epithelium(RPE)cells transplantation. METHOD:Allogenic RPE transplantation on rahbits by transcleral technique, the changes of interleukin-2 (IL-2) activity in peripheral blood and the effect of immunoinhibitor (methylprednisonlone)were detected. RESLILTS:In the group of simple transplantation,the IL-2 activity in peripheral blood begin to rise in the first day after operation. The peak value occured in the third day,and is still much higher than that of the control group in the 14th day,whereas in the group treated with immunoinhibitor ,there was no obvious difference in the first day after operatlon,in the third day,the IL-2 activity rises slightly,and returned to normal level in the 7th day. CONCLUSION: After RPE transplantation, the level of IL-2 activity in peripheral blood might serve as an important index to determining and detecting the rejective response. （Chin J Ocul Fundus Dis,1996,12: 239-241）
OBJECTIVE: To observe the heart anatomic and histological structure of the Banna mini-pig inbred-lined and to provide the morphological data for heart xenotransplantation and breeding transgens pig. METHODS: Ten Banna mini-pigs (12-18 months old) were affused and fixed by common coratid artery. The heart were observed and measured by gross anatomy and histology. RESULTS: There were many similarities between the Banna pig heart and the human heart in anatomy and histology. However, the following differences were observed in the Banna pig heart: 1. Azygos vein directly drew into right atrium cordis. 2. The intercalated disk of cardiac muscle was less than that of human. 3. The Purkinje’s fibre was bigger than that of human. CONCLUSION: On the morphology and histology, the structure of Banna pig heart is similar to the heart of human being. It is possible that Banna minipig heart becomes organ donors for xenotransplantation.
Objective To review the methods of overcoming immunological rejection in xenotransplantation.Methods The strategies of overcoming immunological rejection in xenotransplantation were analyzed and summaried on the basis of an extensive review of the latest l iterature concerned. Results The research development of immunological rejection mechanism and molecular biological technique provided new approaches for overcoming immunological rejection in xenotransplantation. Conclusion It is only a matter of time for xenotransplantation to be appl ied cl inically.
Objective To observe the enzymic histochemical and ultrastructral changes of cryopreserved human retina. Methods To compare the activity of lactate dehydrogenase (LDH)， succinate dehydrogenase (SDH) and ATPase in cryopreserved retina with those in fresh retina and to observe the histological and ultrastructural changes of cryopreserved retina. Results There was no statistical difference between the activity of LDH，SDH and ATPase in fresh and in cryopreserved retina. Histologically, in the cryopreserved retina, fluid in neural fiber and outer plexiform layers, as well as in cone and rod layer, was sligthly more than normal. The ultrastructure is normal except that the mitochondria was swollen in different degree. Conclusion Cryopreservation may be an effective method for keeping the retinal cells alive for a long period and might free the transplantation from dependance on aviability of fresh dornor tissue. (Chin J Ocul Fundus Dis，2000，16：139-212)
ObjectiveTo evaluate the therapeutic effect of liver transplantation (LT) combined with adenovirus-mediated delivery of herpes simplex virus thymidine kinase / ganciclovir (ADV-TK/GCV) in treatment of patients with hepatocellular carcinoma (HCC), so as to benefit more patients with HCC beyond the Milan criteria. MethodsThe clinicopathologic data of patients with HCC underwent LT by the author team since 2007 were collected and analyzed. The patients were assigned into simple LT group and LT+ADV-TK/GCV group. The 5-year cumulative overall survival rate and relapse free survival rate of all LT patients and the patients with LT beyond the Milan criteria by simple LT and LT+ADV-TK/GCV therapy were compared. Meanwhile, Cox regression was used to analyze the risk factors affecting long-term overall survival rate and relapse free survival rate of all patients with HCC after LT. ResultsA total of 216 patients eligible for inclusion were collected in this study, including 134 patients in the simple LT group and 82 patients in the LT+ADV-TK/GCV group, 162 of whom beyond the Milan criteria, including 101 patients underwent the simple LT and 61 patients underwent the LT+ADV-TK/GCV. There were no statistical differences in the baseline data between the simple LT and LT+ADV-TK/GCV in all patients and patients beyond the Milan criteria (P>0.05). There were no statistical differences in 5-year overall survival rate and relapse free survival rate of all patients with HCC (P>0.05). The 5-year cumulative overall survival rate of the LT+ADV-TK/GCV group was better than that of the simple LT group in the patients beyond the Milan criteria (χ2=4.11, P=0.047), but it was not found that the 5-year cumulative relapse free survival rate had statistical difference (27-month survival time as the critical value, P=0.46, P=0.06). Cox regression multivariate analysis results showed that the larger cumulative tumor diameter, the preoperative elevated serum alpha fetoprotein (>400 μg/L), later TNM stage, and without combination of ADV-TK/GCV therapy increased the probability of shorter overall survival of patients after LT; and the patient’s older age, the larger cumulative tumor diameter, and later TNM stage increased the probability of shorter relapse free survival after LT, and it was not found that the combination of ADV-TK/GCV therapy had an impact on the relapse free survival. ConclusionLT combined with ADV-TK/GCV therapy can obviously improve overall survival among patients beyond the Milan criteria, more patients with advanced HCC will be candidates for LT combined with ADV-TK/GCV therapy.
Objective To investigate the development and metastasis of malignant choroidal melanoma cell strain OCM-1-gfp modified with green fluorescent protein(GFP) and the factors which affected the tumor biological behaviors. Methods GFP was transfected into malignant melanoma cell strain OCM-1.Melanoma cells with high and stable expression of GFP were injected into subretinal space and the subcutaneous space of hind leg of Balb/c nude mouse respectively in order to establish orthotopic and heterotopic transplanted tumor models.The development and metastasis process of orthotopic tumor models was observed directly by fluorescence microscope，and the size of the hypodermal tumor was measured by vernier.The expressions of 13 genes in melanoma were detected by means of immunohistochemistry staining. Results Malignant choroidal melanoma cell strain OCM-1 stably expressed GFP and preserved the characteristics of parental generation，OCM-1-gfp may develop melanoma and continue to metastasize in nude mouse.Positive expression of most of the antibodies，including Rb，p53，p21，E2F，NFkappa;B，cyclin D1，proliferation cellular nuclear antigen（PCNA），bcl2、bclXL/S，bax，and epithelial growth factor（EGF）and its receptor（EGFR），was found.While the staining of inhibition gene p16 was negative. Conclusions GFP is the marker for observing the development and metastasis of malignant choroidal melanoma in vivo.The rate of tumor formation and development process in orthotopic models does not differs much from which in heterotopic models of malignant choroidal melanoma.The expressions of lots of genes in malignant choroidal melanoma developed from OCM-1-gfp including p16、p53、NFkappa;B，cyclin D，PCNA，EGF，and EGFR are abnormal. (Chin J Ocul Fundus Dis, 2006, 22: 170-173)
ObjectiveTo compare the effect and safety of basiliximab in ABO incompatible pediatric liver transplant recipients.MethodsABO incompatible pediatric liver transplantation operated between January 2019 and August 2020 were studied. The patients were allocated randomized into two groups. Patients in experimental group were treated with basiliximab as immune induction therapy, but basiliximab was not used in patients of control group. Tacrolimus combined methylprednisolone were used after liver transplantation. The clinical characteristics, graft and recipient survival rate, rejection, infectious complications, and kidney functions after liver transplantation were observed. Donor specific antibody (DSA) was tested in 3 months after liver transplantation. The growth and development were assessed too after liver transplant.ResultsFourty-four patients were enrolled in the study, including 19 patients in the experimental group and 25 patients in the control group. The median follow-up time was 16.6 months (3.8–25.4 months), and there were no statistically differences between the two groups in terms of age, sex, weight, pediatric end-stage liver disease (PELD) score, and other basic conditions. There were no significant differences between the two groups in tacrolimus dose, tacrolimus trough concentration, kidney functions, height and weight growth after liver transplantation. There were no statistical differences in lung infection, blood stream infection within 3 months after liver transplantation, cytomegalovirus, EBV infection, graft/patient survival rate after liver transplantation (P>0.05). However, the acute rejection rate was lower and the DSA positive rate in 3 months after liver transplantation was lower in the experimental group (P<0.05).ConclusionsBasiliximab can be safely used in ABO incompatible pediatric liver transplant recipients. Acute rejection rate and DSA positive rate after transplantation can be decreased with the useof basiliximab.
Objective To summarize the clinical experience of liver retransplantation. Methods Six liver retransplantations were performed. The indications consisted of primary non-function (PNF, 2 cases), acute or chronic rejection (2 cases), stomas stenosis of biliary tract (1 case) and primary sclerosing cholangitis (1 case). The immunosuppressive protocols included tacrolimus, methylprednisolone (MP) and mycophenolate mofetil (MMF). Results Five patients were cured. One patient died on day 4 after liver retransplantation because of multiple organ failure. Postoperative complications included deep fungal infection and wound infection. Conclusions Liver retransplantation is an effective method for graft failure after liver transplantation. Proper indication and optimum operative time, intensive perioperative supervision and proper treatment are very important to improv effect of liver retransplantation.
OBJECTIVE: To explore the possibility to bridge peripheral nerve defects by xenogeneic acellular nerve basal lamina scaffolds. METHODS: Thirty SD rats were randomly divided into 5 groups; in each group, the left sciatic nerves were bridged respectively by predegenerated or fresh xenogeneic acellular nerve basal lamina scaffolds, autogenous nerve grafting, fresh xenogeneic nerve grafting or without bridging. Two kinds of acellular nerve basal lamina scaffolds, extracted by 3% Triton X-100 and 4% deoxycholate sodium from either fresh rabbit tibial nerves or predegenerated ones for 2 weeks, were transplanted to bridge 15 mm rat sciatic nerve gaps. Six months after the grafting, the recovery of function was evaluated by gait analysis, pinch test, morphological and morphometric analysis. RESULTS: The sciatic nerve function indexes (SFI) were -30.7% +/- 6.8% in rats treated with xenogeneic acellular nerve, -36.2% +/- 9.7% with xenogeneic predegenerated acellular nerve, and -33.9% +/- 11.3% with autograft respectively (P gt; 0.05). The number of regenerative myelinated axons, diameter of myelinated fibers and thickness of myelin sheath in acellular xenograft were satisfactory when compared with that in autograft. Regenerated microfascicles distributed in the center of degenerated and acellular nerve group. The regenerated nerve fibers had normal morphological and structural characters under transmission electron microscope. The number and diameter of myelinated fibers in degenerated accellular nerve group was similar to that of autograft group (P gt; 0.05). Whereas the thickness of myelin sheath in degenerated accellular nerve group was significantly less than that of autograft group (P lt; 0.05). CONCLUSION: The above results indicate that xenogeneic acellular nerve basal lamina scaffolds extracted by chemical procedure can be successfully used to repair nerve defects without any immunosuppressants.
OBJECTIVE: To explore the kidney anatomic structure of banna minipig inbred-lines, and to provide data for kidney xenotransplantation. METHODS: The fresh and infused kidneys of banna minipig (including the vessel and the ureter) were checked by anatomic microscope and vernier caliper in original location and away body. The tissue structure was observed by HE stain. RESULTS: The structure of kidney of banna minipig inbred-lines (including the vessel and the ureter) are similar to that of human being. The fascia propria of kidney is divided into three layers including capsula fibrosa, capsula adipose and fascia renalis. The thickness of cortex renalis is (20.0 +/- 2.4) mm. The average diameter of renal artery is 5.1 mm and is similar to that of human being. All the kidneys of banna minipig inbred-lines have a single branch renal artery. The diameters of left and right ureters are 5.1 mm and 4.7 mm, respectively. CONCLUSION: The kidney of banna minipig inbred-lines is an ideal replacement of human kidney for xenotransplantation.