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【Objective】 To compare and study the characteristics of blood donors with and without adverse reactions to apheresis platelet donation(ARAPD), and to study the influencing factors of blood donors participating in blood donation again, so as to provide basis for putting forward scientific and reasonable countermeasures and retaining blood donors to the greatest extent. 【Methods】 157 679 platelet donors from Tianjin Blood Center from December 26, 2015 to December 25, 2020 were selected and divided into ARAPD group(n=168) and non-ARAPD group (n=157 511). Such characteristics as sex, age, height, weight, blood type, educational background, first-time donation or not, platelet count, hematocrit, phlebotomy time, circulating blood volume and anticoagulant dosage of the two groups were analyzed. Chi-square test was used to identify the high-risk population with poor blood donation response. Multivariate binary logistic regression was used to study the influencing factors of blood donors returning. 【Results】 The age, height and weight of ARAPD group were lower than those of the non-ARAPD group, and the proportion of first-time blood donors, the proportion of women and phlebotomy time were higher than those of non-ARAPD group. There was little difference between the two groups in circulating blood volume, anticoagulant dosage, pre- and post-donation platelet count and hematocrit. Logistic regression analysis showed that the influencing factors of ARAPD were age, educational background, first-time donation or not and phlebotomy time, among which age and first-time donation or not were positively correlated, education and phlebotomy time were negatively correlated (P<0.05). 【Conclusion】 Female, low age, low height and weight, and less blood donation are the basic characteristics of high-risk people with ARAPD. Low age, high education, first-time blood donation and long phlebotomy time are the influencing factors that lead to donor lapsing. Therefore, countermeasures are put forward based on the above results.
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Objective:To investigate the clinical value of early gastroscopy for patients with hypopharyngeal cancer.Methods:A total of 231 cases of hypopharyngeal cancer diagnosed and treated in the First Affiliated Hospital of Xiamen University from January 2010 to December 2014 were included in the retrospective analysis. The 5-year survival rate of hypopharyngeal cancer and patients accompanied with synchronous esophageal cancer (including early and advanced esophageal cancer), as well as the detection rate of synchronous esophageal cancer by gastroscopy and systemic PET-CT examination were statistically analyzed.Results:The 5-year survival rate of hypopharyngeal cancer was 38.96% (90/231). The 5-year survival rates of 62 patients accompanied with synchronous esophageal cancer and 169 patients without were 27.42% (17/62) and 43.20% (73/169), respectively, with statistic difference ( χ2=4.747, P=0.029). The 5-year survival rate of 49 patients accompanied with synchronous early esophageal cancer was 30.69% (17/49). Among the 13 patients with synchronous progressive esophageal cancer, none had a survival period of 5 years, which was significantly different compared with the patients with synchronous early esophageal cancer ( P=0.013). The detection rates of synchronous esophageal carcinoma by gastroscopy and by systemic PET-CT were 26.84% (62/231) and 14.29% (33/231), respectively, with statistic difference ( χ2=11.14, P<0.01). The detection rates of synchronous early esophageal carcinoma by gastroscopy and by systemic PET-CT were 21.21% (49/231) and 8.66% (20/231), respectively, and the difference was also statistically significant ( χ2=14.328, P<0.01). Conclusion:Hypopharyngeal cancer accompanied with synchronous esophageal cancer is of high risk, which affects the survival rate of patients. Early gastroscopy in hypopharyngeal cancer patients can significantly improve the detection rate of synchronous esophageal cancer, which helps to design individualized regimen to improve the survival rate of patients.
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Objective: To discuss the curative effect of slow stretching training combined with extracorporeal shock wave in the treatment of spasticity of biceps brachii in the stroke patients, and to provide the clinical evdiences for the application of this therapy. Methods: Fifty-six patients with post-stroke biceps bachii spasticity were randomly divided into observation group (n =28) and control group (n=28) according to random number table method. The patients in two groups received routine treatment (40 min/time, 2 times · d-1, 6 d per week) and slow stretching training (15 min/time, 2 times · d-1, 6 d per week). On the basis of the routine treatment, the patients in observation group were treated with extracorporeal shock wave, while the patients in control group were treated with pseudo-extracorporeal wave therapy. Modified Ashworth scale (MAS), simplified upper limb Fugl-Meyer score (FMA) and modified Barthel index (MBI) were used to evaluate the curative effects before treatment, 2 weeks and 4 weeks after treatment. Results: After 2 weeks of treatment, the FMA score of the patients in observation group was siginificantly increased compared with before treatment (P0.05). Compared with 2 weeks after treatment, the MAS score of the patients in observation group 4 weeks after treatment was significantly decreased (P<0.05), and the FMA and MBI scores were increased (P< 0.05); the FMA score and the MBI score in observation group were significantly higher than those in control group (P<0.05 or P<0.01), and the MAS score was significantly lower than that in control group (P<0.01). Conclusion: Slow stretching training combined with extracorporeal shock wave could effectively improve the post-stroke biceps brachii spasticity, and its therapeutic effect is better than the simple application of slow stretching training.
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Objective:To discuss the curative effect of slow stretching training combined with extracorporeal shock wave in the treatment of spasticity of biceps brachii in the stroke patients,and to provide the clinical evdiences for the application of this therapy.Methods:Fifty-six patients with post-stroke biceps bachii spasticity were randomly divided into observation group(n =28)and control group(n=28)according to random number table method.The patients in two groups received routine treatment(40 min/time,2 times·d-1,6 d per week)and slow stretching training(15 min/time,2 times·d-1,6 d per week).On the basis of the routine treatment,the patients in observation group were treated with extracorporeal shock wave,while the patients in control group were treated with pseudo-extracorporeal wave therapy.Modified Ashworth scale(MAS),simplified upper limb Fugl-Meyer score(FMA)and modified Barthel index(MBI)were used to evaluate the curative effects before treatment, 2 weeks and 4 weeks after treatment.Results:After 2 weeks of treatment,the FMA score of the patients in observation group was siginificantly increased compared with before treatment(P<0.05),and the MBI and MAS scores were decreased(P<0.05);the MAS score of the patients in observation group was significantly lower than that in control group(P=0.036),while there were no significant differences in the FMA and MBI scores between two groups(P>0.05).Compared with 2 weeks after treatment,the MAS score of the patients in observation group 4 weeks after treatment was significantly decreased(P<0.05),and the FMA and MBI scores were increased(P<0.05);the FMA score and the MBI score in observation group were significantly higher than those in control group (P<0.05 or P<0.01),and the MAS score was significantly lower than that in control group(P<0.01). Conclusion:Slow stretching training combined with extracorporeal shock wave could effectively improve the post-stroke biceps brachii spasticity,and its therapeutic effect is better than the simple application of slow stretching training.
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This paper deeply studied the definition and characteristics of clinical research programs. On such basis, the researchers utilized theoretical and comparative studies in combination of practical studies, to probe deeply into both the operating procedures and management documents of the clinical research management council.These efforts contributed to constructing a systematic, overall and feasible management system,for reference of building such a council by medical institutions.
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Background Laser peripheral iridoplasty (LPI) is widely used in the treatment of glaucoma by flattening the iris and widening angle of anterior chamber (AA).However,no evidence suggests the optimal site of LPI in iris.Objective This study was to compare the therapeutic effects of LPI at different sites of iris for glaucoma.Methods Glaucoma models were established in the right eyes of 40 healthy adult male pigment rabbits by intrachamber injection of 0.1 ml compound carbomer solution with 0.3％ carbomer and 0.025％ dexamethasone.The models were randomly divided into model control group,corneoscleral limbus group,one spot from corneoscleral limbus group and two spots from corneoscleral limbus group.LPI was performed at corresponding site of iris by 532 nm argon laser with the spot diameter 500 μm,energy 300 mW,exposure time 0.3 seconds and laser number 24 spots,and the rabbits in the model control group did not receive LPI.Intraocular pressure (IOP),coefficient of outflow facility (C value) were measured and calculated with Schi(o)tz tonometer before LPI and 2,4,7,14 and 30 days after LPI,and anterior chamber depth (ACD),AA,anterior chamber angle opening distance within 500 μm radius from scleral spur (AOD500) were measured with ultrasound biomicroscope (UBM).The eyeballs were extracted 30 days after LPI,and the chamber angle were observed under the optical microscope after hematoxylin and eosin staining.The use and care of the animals complied with the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health.Results UBM showed that compared with the model control group,the anterior chamber angle was evidently widened in all the LPI groups,with the best effectiveness in the one spot from corneoscleral limbus group and the worst one in the two spots from corneoscleral limbus group.Compared with the model control group,the IOP was evidently reduced,and C values,AA and AOD500 were significantly increased in the corneoscleral limbus group,one spot from corneoscleral limbus group and two spots from corneoscleral limbus group after LPI,showing significant differences among the four groups (IOP:Fgroup =16.848,P ＜ 0.01;C value:Fgroup =9.629,P ＜ 0.01;AA:Fgroup =62.336,P＜0.01;AOD500:Fgroup =77.779,P ＜ 0.01).IOP was reduced and C value,AA and AOD500 were increased in 2,4,7,14 and 30 days after LPI as compared with before LPI,with significant differences over time (IOP:Ftime =3.041,P =0.011;C value:Ftime =4.311,P＜0.01;AA:Ftime =14.627,P＜0.01;AOD500:Ftime =20.378,P＜0.01).Compared with the model control group,the ACD was significantly increased in the corneoscleral limbus group and one spot from corneoscleral limbus group,and that in the two spots from corneoscleral limbus group was significantly reduced,and the ACD was insignificantly increased over time after LPI (Fgroup =18.017,P＜0.01;Ftime =0.022,P =1.000).Hematoxylin and eosin staining showed that the trabecular meshwork and adhesion of tissure were reopened and the anterior chamber angle was widened after LPI.Conclusions LPI can widen anterior chamber angle and lower the IOP.The best therapeutic outcome for glaucoma is displayed when LPI is performed at the iris site corresponding to one spot from the corneoscleral limbus.
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Background Age-related cataract is a common cause of blindness.However,its cause and pathogenic mechanism have not been fully understood.Recent studies revealed that aquaporin 1 (AQP1) and AQP0 are closely related to the pathogenesis of cataract.Objective This study was to investigate the differential distribution and expression of AQP0 and AQP1 in lenses with age-related cataract and explore its effect on pathogenesis of age-related cataract.Methods Seventeen anterior capsular membrane samples and nucleus samples of lenses were collected from age-related cataract patients during the small incision nonphacoemulsification cataract extraction,and 6 normal lens samples were obtained from health donors in the First Affiliated Hospital of Fujian Medical University.The expression and distribution of AQP1 and AQP0 in the lenses were detected by immunohistochemistry,and the relative expression levels of AQP1 and AQP0 proteins in the lenses were assayed by using Western blot assay.This study protocol was approved by Ethic Committee of this hospital,and written informed consent was obtained from each patient.Results Immunohistochemistry showed that in the normal lenses,AQP1 expressed mainly in LECs;while AQP0 primarily expressed in fiber cells of the lens cortex and nucleus.The relative expression levels of AQP1 and AQP0 in the lenses with age-related cataract (absorbance) were 0.223±0.008 and 0.118±0.015,which were significantly lower than 0.246±0.007 and 0.149±0.007 in the normal lenses (t =-4.508,-3.291,both at P＜0.01).Western blot revealed that the relative expression levels of AQP1 and AQP0 in the lenses with age-related cataract (absorbance) were 0.663 ± 0.012 and 0.599 ± 0.015,which were significantly reduced in comparison with 0.844±0.041 and 0.955 ±0.064 in the normal lenses (t =-7.492,P＜0.05;t =-9.570,P＜0.01).Conclusions AQP1 and AQP0 distribute in different sites of lenses.The expressions of AQP1 and AQP0 are obviously down-regulated in lenses with age-related cataract,suggesting that AQP1 and AQP0 probably play different roles in the pathogenesis of age-related cataract.
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Background Retinal microglia (RMG) plays an important role in the pathogenesis of retinal degenerative diseases,while chemokine CX3CL1 participates in the regulation of steady-state of microglia.It has been determined that bone marrow-derived mesenchymal stem cells (BMSCs) have a remarkable role to modulate the immune response and protect the central nervous system through the release of soluble factors in a paracrine fashion and further affect the functional behavior of cells.However,whether BMSCs are able to interact with RMG and activate related signaling pathway for the maintaining of homeostasis in the retina is still unclear.Objective The aim of this study was to investigate the interaction between BMSCs and lipopolysaccharide (LPS)-activated RMG in vitro,and dissect the effects of CX3CL1/CX3CR1 signaling pathway on the biological behavior of BMSCs and RMG.Methods RMG was isolated from SD rats,cultured with mixed culture of retinal glial cells and purified by shaking.The cells were identified by detecting the expression of CD111b,Iba1 and glutamamine synthetase (GS) with indirect immunofluorescence assay.LPS (1 mg/ml,2 μl) was added in the medium for 24 hours to stimulate RMG,and then the cells were divided into LPS control group,BMSCs group (cocultured with BMSCs for 24 hours) and CB-BMSCs group (cocultured with CX3CL1-blocking-BMSCs for 24 hours).The cells without LPS stimulation served as the blank control group.The functions of RMG,including the release content of tumor necrosis factor-α (TNF-α) and interleukin-1 β (IL-1β),the proliferation,phagocytosis,and migration of RMG were examined.Results RMG was successfully isolated and harvested from SD rats by using mixed culture of retinal glial cells and purified by shaking.CD11b and Iba1 showed the positive expression with the green fluorescence in the cells and GS was absent.The contents of TNF-αt in the cell supernatant were (2.55 ±0.97) ng/ml,(24.91 ±3.07) ng/ml,(20.38 ±2.97) ng/ml and (24.90 ± 1.88) ng/ml in the blank control group,LPS control group,BMSCs group and CB-BMSCs group,respectively,showing a significant difference among the groups (F=119.90,P＜0.05).The contents of IL-1 β in the cell supernatant were (1.12±0.36) ng/ml,(10.40±2.76) ng/ml,(7.00± 1.75) ng/ml and (9.55 ± 1.11) ng/ml in the blank control group,LPS control group,BMSCs group and CB-BMSCs group,respectively,showing a significant difference among the groups(F =34.96,P＜0.05).The secretory volume of TNF-α and IL-1 β were evidently lower in the BMSCs group than those in the LPS control group (both at P＜0.05),and no significant differences were found in the secretory volume of TNF-α and IL-1β between CB-BMSCs group and LPS control group (both at P＞0.05).The proliferative rate of RMG was lower in the BMSCs group than that in the LPS control group (P＜0.05),while there was no statistical difference between BMSCs group and CB-BMSCs group (P＞0.05).The mean fluorescence intensity (MFI) and the number of migrated RMG were considerably different among the four groups (F=70.55,15.49,both at P＜0.05),and those in the BMSCs group were significantly increased in comparison with the LPS control group (both at P＜0.05),while there was no significant difference between CB-BMSCs group and LPS control group (both at P＞0.05).Conclusions BMSCs could suppress the proliferation of LPS-activated RMG.Moreover,BMSCs might inhibit proinflammatory cytokines releasing,enhance phagocytosis and migration capabilities of RMG via CX3CL1/CX3CR1 signaling pathway.
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Background The imbalance of cell cycle regulation results in proliferative vitreoretinopathy (PVR).Studing the effects of cyclin dependent kinase (CDK) and CDK inhibitor (CKI) on the cell cycle regulation of retinal pigment epithelial (RPE) cells and fibroblasts in PVR formation is of important significance.Objective This study was to investigate the expressing trend of p21 ,p27 and CDK inhibitors in retinas of different ages of rabbits and explore the relationship between p21 or p27 and cell growth.Methods Nine clean New Zealand rabbits were assigned to 10-week group,20-week group and 30-week group according to the age and 3 rabbits for each.The eyeballs were enucleated binocularly after the animals were sacrificed and retinas were isolated.Real-time PCR and Western blot were employed to detect the expressions of p21 and p27 mRNA and their proteins in retinas of the rabbits.The use and care of the animals followed the Regulations for the Administration of Affair Concerning Experimental Animals by State Science and Technology Committee.Results The relative expressing levels of p21 mRNA were 1.631±0.063,1.506±0.012 and 1.585 ±0.015, and those of p27 m RNA were 1.581 ± 0.048,1.470 ± 0.012 and 1.490 ±0.013 in the 10-week group,20-week group and 30-week group, respectively, showing significant differences among the groups (p21 mRNA: F=9.311,P=0.014;p27 mRNA: F=12.360, P=0.007) , and the p21 and p27 mRNA expressing levels were significantly higher in the 10-week group and 30-week group than those in the 20-week group (all at P＜ 0.05).The expressing levels of p21 protein were 0.675 ± 0.061,0.089 ±0.001 and 0.200 ± 0.007, and those of p27 protein were 0.928±0.019,0.183±0.005 and 0.576±0.089 in the 10-week group,20-week group and 30-week group, respectively, with remarkable differences among the groups (p21 : F =228.905, P＜0.001;p27 : F =148.957,P＜0.001), and the expressions were significantly raised in the 10-week group and 30-week group in comparison with the 20-week group (all at P＜0.01).Significantly positive correlations were found in the expressing levels of p21 and p27 both in transcriptional and protein levels (mRNA : r =0.906, P＜0.01;protein : r =0.913, P＜0.01).Conclusions The expressions of p21 and p27 up-regulate in the retinas of developing stage of rabbits but gradually reduce with adultness.However, p21 and p27 levels appear to be increasingly raised with aging of the rabbits.It is implied that p21 and p27 play a balancing role in the process of cycle regulation in retina cells.
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BACKGROUND:Many present studies have reported the early clinical therapeutic effects of short-segment non-fusion fixation for the repair of thoracolumbar burst fracture. The results are satisfactory. However, the mid-and long-term fol ow-up results of this scheme for treating thoracolumbar burst fracture are seldom reported. ＜br> OBJECTIVE:To evaluate the mid-term results of short segment pedicle screw fixation without bone fusion for unstable thoracolumbar burst fracture. ＜br> METHODS:Data of 12 patients with unstable thoracolumbar burst fractures undergoing short segment pedicle screw fixation without bone fusion were retrospectively analyzed. Al patients experienced severe intraspinal occupying and neurological dysfunction, and al of them affected single segment thoracolumbar injuries. The surgical procedure included postural reduction for 2 days and screw fixations at one level above, one level below and at the fractured level itself. The patients underwent removal of implants at 12 months after the initial operation. Imaging and clinical findings, including canal encroachment, percentage of vertebral body height loss, Cobb angle, American Spinal Injury Association motor score, Frankel grade and adjacent segment degenemtion, were evaluated. ＜br> RESULTS AND CONCLUSION:Al patients were fol owed up for at least 5 years. Significant differences in canal encroachment, percentage of vertebral body height loss and Cobb angle were detectable between post-fixation and pre-fixation (P＜0.05). Evaluation results were significantly better after fixation than that before fixation, but no significant difference in evaluation results after fixation was detected (P>0.05). After implantation and removal of fixator, none cases affected aggravated symptoms of neurological impairment. American Spinal Injury Association motor score was 34.2±6.3 before fixation, and 47.7±9.5 during the final fol ow-up, showing significant differences (t=-4.103, P=0.000). During the final fol ow-up, adjacent segments in damage levels did not suffer from degeneration in al patients. Neurological function showed the recovery of Frankel grades 1 or 2. These data indicated that a good mid-term result of short segment pedicle screw fixation without bone fusion for unstable thoracolumbar burst fracture with neurological deficit can be achieved. The improved saggital alignment was effectively constructed and maintained. Adjacent segment degeneration was not found at the injury level.
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Objective To establish a rat model of blood ocular barrier breakdown induced by anterior segment intraocular analogic surgery. Methods One hundred and fifty healthy adult male rats were randomly divided into control group and model group,75 rats in each group.The rats were anesthetized with 1 ml/kg ketamine hydrochloride/xylazine hydrochloride solution.Three way pipes were attached to a phosphate buffer infusion bag and two intravenous catheters. One catheter was inserted 30° obliquelythrough the transparent cornea anterior to the limbus into the rat's anterior chamber.Then the needle was withdrawn and the sheath was indwelling.Another catheter was connected with a manometer.Intraocular pressure was varied from 0 to 12 mm Hg (1 mm Hg=0.133 kPa) 60 times,30 times per min.The catheter was removed.The eyes were treated with ofloxacin ophthalmic solution after surgery.The 1st,2nd,3rd,5th and 7th day after surgery,the integrity of the blood ocular barrier was assessed by immunohistochemical staining for albumin and quantitative measurement using Evan's blue as a tracer. Results Albumin immunohistochemical staining of the control group was confined to the iris and retinal blood vessels.The choroid was stained at each time point after surgery.Albumin immunohistochemical staining of the model group was abundant around the iris and the retinal vasculature on the 1st day after surgery.The albumin diffused throughout the iris and the retina on the 2nd and the 3rd day after surgery.The albumin reached the retinal vessels on the 5th and 7th day after surgery.The aqueous humor Evans blue leakages of the model group were higher than those of the control group on the 1st,2nd,3rd and 5th day after surgery.The differences were statistically significant (t=25.781,37.433,25.150,19.171; P＜0.01).The Evans blue leakage of the model group was close to that of the control group on the 7th day after surgery. The difference was no statistical significant(t=1.303,P=0.209).The retinal Evans blue leakages of the model group were higher than those of the control group on the 1st,the 2nd and the 3rd day after surgery.The differences were statistically significant (t=11.997,14.622,23.014; P＜0.01).The Evans blue leakage of the model group was close to those of the control group on the 5th and 7th day after surgery. The differences were not statistically significant(t=2.027,0.756 ； P=0.058,0.459).Conclusion This study establishes a rat model of blood ocular barrier breakdown induced by imitating the injury to the anterior segment during intraocular surgery.
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Objective To investigate the retinal pigment epithelium cells(RPE) and makeit the base of clinical application for transplantation.Methods The cultured RPE cells labeled by BrdU was injected into the host's subretinal space by external transcleral.The structure and ultrastructure of the transplanted RPE cells were observed by microscope and transmission electron microscope.Results The transplanted cells had the normal structure as the host's cells.They attached to Bruch's membrane with basal infoldings and forming microvill on the surface of the cells.Conclusion The external transcleral is a practical method for RPE transplatation.The transplanted cells can vitalize and form some normal ultrastrcture.
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Objective To investigate the expression of MMP-2, MMP-9 and TIMP-1. TIMP-2 during the course of traumatie pro- liferative vitreoretinopathy (tPVR) in rat retina treated with GM6001 and without GM6001 and evaluate the interventiunal effect uf GM6001 on tPVR. Design Experimental study. Participants 108 SD rats. Methods Rats were divided randomly into three groups: the Ns control group, the tPVR group, the tPVR treated with GM6001 group. The expression of MMP-2. MMP-9 and TIMP-1. TIMP-2 in retina was analyzed by Western Blot on day 1, 3. 7, 14, 21 and 28. Main Outcome Measures The expression of MMP-2, MMP-9, TIMP-2, TIMP-1 in the SD rats' retina of every group. Results The results of Western Blot showed that the expression of MMP-2 in the SD rats' retina of the tPVR group was stronger than the one in other groups at day 3, 7, 14, 21 and 28: the tPVR treated with GM6001 group was weaker than the one in the tPVR group at day 14, 21 and 28d. The expression of MMP-9 in the tPVR group was stronger than the one in other groups at all time; the cireumstance of tPVR treated with GM6001 group was weaker than the one in the tPVR group at day 1, 3, 7, 14 and 21. The rate of MMP-2/TIMP-2 of the SD rats" retina in the tPVR group increased at day 14, 21 and 28, and it was lower in the tPVR treated with GM6001 group compared with the tPVR group. The rate of MMP-9/TIMP-1 in the tPVR group increased at all time, and it degraded in the tPVR treated with GM6001 group as compared with the tPVR group. Conclusions The dishalance of MMP-2 and TIMP-2, MMP-9 and TIMP-1 involves with the course of tPVR. GM6001 playes an important role in in- terfering the course of tPVR by regulating the balance of these cell faetors.
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Objective To investigate the influence of serial subcultivation on the immunoregulation of retinal pigment epithelialium cells in vitro.Methods Co-culture-systems of HRPE cells with lymphocytes were established in vitro.The expression of Fas on different passages of HRPE cells and the induction of apoptosis on lymphocytes were observed by flow cytometry. Results When co-cultured with lymphocytes,the expression of Fas was tapering and the duration of culture in vitro was significantly correlated with the expression of Fas(the rate of positive cell: r=-0.859,P0.05).Conclusion HRPE cells beyond 3 passages showed a 1ow capability of immunoregulation and were not suitable for seeds cells for HRPE transplantation.
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Objective To investigate the expression of MMP-2 and TIMP-2 during the course of traumatic PVR treated with GM6001 and without GM6001,and to explore the potential role of MMP-2 and TIMP-2 during the course of traumatic PVR and to evaluate the effect of GM6001 on traumatic PVR prevention and treatment.Methods 360 SD rats were divided randomly into three groups: normal control group,the traumatic PVR group,the traumatic PVR treated with GM6001 group.The normal control group was intravitreous injected with normal saline.The traumatic PVR group was intravitreous injected with the PRP.The traumatic PVR treated with GM6001 group was intravitreous injected with the PRP and GM6001.The expression of MMP-2 and TIMP-2 were qualitativly and semiquantitativly analyzed with immunohistochemistry on day 1,3,7,14,21 and 28.Results 1.The results of immunohistochemistry showed that the expression of MMP-2,TIMP-2 was mainly located in the photoreceptor cells layer,out plexiform layer,inner plexiform layer and nerve fiber layer.2.The expression of MMP-2 in the normal group and the traumatic PVR treated with GM6001 group was weak at all time.The differences were statistical significance as compared with the normal group and the traumatic PVR treated with GM6001 group(P