Background Thyroid-associated ophthalmopathy (TAO) is characterized by increased amount of orbital fat tissue.Leptin is a specific adipocytokine,and it may play an important role in the pathogenesis of TAO.Objective The present study investigates the effect of rh-leptin on the differentiation of orbital preadipocytes in subjects suffering from thyroid-associated ophthalmopathy (TAO).Methods The orbital fatty tissue was obtained from 7 patients with TAO during orbital decompression surgery.Orbital preadipocytes were cultured using the explant method and differentiated cells were identified with oil red staining.The subcultured preadipocytes were incubated with different concentrations of rh-leptin,and no rh-leptin was added in the control group.The average optical density of cytoplasm/nucleolus in differentiated adipocytes was measured by oil-red staining to evaluate the influence of different concentrations of rh-leptin on lipid formation of orbital adipocytes.Results Cultured preadipocytes in vitro were identified to be of mesenchymal origin by immunohistochemical staining.The average optical density of cytoplasm/nucleolus was 1.07±0.22,0.80±0.17,0.56±0.11,0.25±0.10,and 0.17±0.08,respectively in the control group,10μg/L of leptin group,50μg/L of leptin group,100μg/L of leptin group and 500μg/L of leptin group,showing a significant difference among the five groups (F=20.64,P=0.00).Compared to the control group,the lipid formation of orbital adipocytes gradually declined in various concentrations of rh-leptin (P＜0.05,P＜0.01).Conclusion Rh-leptin may suppress the differentiation and lipid formation of TAO orbital preadipocytes in vitro in a dose-dependent manner.Leptin may be a feedback modulator in TAO pathogenesis.

Background Thyroid-associated ophthalmopathy (TAO) is a kind of clinically common and incurable ocular disease,and its incidence is at top place.The etiology and pathologic mechanism of TAO are still unknown because of shortness of replicative animal models and difficulty to acquire the ocular tissues in the early stage of the disease.To better understand the pathogenesis of TAO and investigate effective treatable measures, an appropriate animal model should be developed.Objective This study was to immunize female BALB/c mice with the recombinant plasmid of human thyroid-stimulating hormone receptor (TSHR) extracellular domain in cationic liposomes for the establishement of TAO models.Methods Thirty-two 6-to 8-week-old female BALB/c mice were randomly assigned to four groups according to computer random allocation.pcDNA3.1 +/hTSHR289 of 100 μg in an adjuvant cationic liposomes was injected via anterior tibialis muscle and peritoneal cavity separately in the recombinant plasmid injection group in 0, 3,6 weeks, and pcDNA3.1 or cationic liposomes was injected in the liposomes injection group or the blank plasmid group in the same way, respectively, and normal saline solution was injected in the blank control group.Body weight of the mice was measued before and 1 month,2,3 and 4 months after initial injection.The manifestations were observed after modeling.The mice were sacrificed 17 weeks after initial injection,and the histopathology examination was carried out on the thyroid gland and orbital tissue.The heart blood was collected from the mice,and serum contents of total thyroxin 4 (TT4) and thyroid-stimulating hormone (TSH)were assayed by ELISA.Results Protrusion, eyelid swell and keratitis occurred in 12 eyes of 6 mice in the recombinant plasmid injection group after immunization.A significant difference in the body weight of the mice was found among the blank control group, blank plasmid group, liposomes injection group and recombinant plasmid injection group (Fgroup =3.425, P =0.028), and the body weight was considerably reduced in the recombinant plasmid injection group in comparison with the blank control group, blank plasmid group,liposomes injection group (Ftime =0.838 ,P=0.023).The serum levels of TT4 were (7.75±1.00), (7.96±0.76), (6.76±1.10) and (4.43±2.88) μg/dlin the blank control group, liposomes injection group, blank plasmid group, and recombinant plasmid injection group, and those of TSH were (6.36±2.58),(4.83±3.96),(6.63±1.71) and (1.60 ±1.76) ng/ml, showing significant differences among the groups (F =7.150, P＜0.001;F =5.521, P＜0.01) , and the serum levels of TT4 and TSH were remarkably lower in the recombinant plasmid injection group than those of the blank control group,liposomes injection group and blank plasmid group (all at P ＜ 0.05).Histopathology revealed the lymphocyte infiltration of thyroid gland in 6 mice and proliferation of orbital adipose tissue, infiltration of lymphocytes and mastocytes,deposition of hyaluronic acid as well as swell, breakage and inflammatory cell infiltration of extraocular muscle in 15 eyes of the recombinant plasmid injection group.Conclusions A murine model of TAO can be successfully induced by immunization with recombination plasmid pcDNA3.1 +/hTSHR289 and cationic liposomes.The histopathology characteristics and ocular findings of the animal models are similar to human TAO.

The cell-free plasma DNA of the 132 critically ill patients admitted to the emergency intensive care unit ( EICU) was measured by real-time quantitative polymerase chain reaction assay for the humanβ-globin gene. Ac-cording to the prognosis, the patients were divided into survival group (95 cases) and death group (37 cases). Blood samples were collected after EICU admission, 24 hours after admission, 48 hours after admission, and 1 week after admission. 30 age-mached controls were collected from healthy volunteers healthy care centre. Com-pared with control group, at each time point, cell-free plasma DNA concentration was significantly higher in EICU patients (P<0. 05). Cell-free plasma DNA concentrations were higher in hospital non-survivors than in survivors, of which plasma DNA concentration of 24 hours after admission and 48 hours after admission was statistically signifi-cant ( P<0 . 05 ) . The area under the ROC curves ( AUC ) for plasma DNA was bigger than the lactate and A-PACHE IIscore, the maximum of AUC was 0. 847(95% CI 0.648~1.000) at the point of 48 hours after admis-sion.

Objective To investigate the histopathological characteristics of choroidal melanoma. Methods The histopathological data from 64 patients with choroidal melanoma were analyzed retrospectively. The tumor size and the cytological types were observed and detected. The locations of the tumor were classified according to the involved part invaded by the anterior margine of the tumor, and the degrees of the development of the tumor were graded according to the extent of the outward infiltration of the tumor cells. Results In 64 patients with choroidal melanoma, There were large, medium, and small tumors in 25(39.1%), 31(48.4%), and 8(12.5%) respectively. The spindle cell type was found in 42 patients (65.6%) including spindle cell A and B type in 15(23.4%) and 27(42.3%) respectively; epithelioid and mixed cell type was found in 7(10.9%) and 10(15.6%) respectively; the other types were found in 5(7.8%). Twenty-five cases(39.1%)had no invasion with sclera, 22(34.4%)had but limited to sclera, 12(18.8%)penetrated through sclera and 5(7.8%)had intra-orbit infiltration. Conclusion The histopathological characteristics of choroidal melanoma are multiple, and spindle cell type is the most common one. The choroidal melanoma can easily invade the sclera.

Objective To evaluate the effectiveness and safety of orbital decompression for compressive optic-neuropathy. Methods Fourteen eyes of twelve cases with Graves opthalmopathy and compressive optic-neuropathy undergone two orbital walls decompression with the follow-up period of more than 3 months were analyzed. Results The effect of complete closure of palpebral fissure was attained in all of the postoperative eyes and the visual acuity was increased in eleven eyes, remained no change in two eyes and decreased in one eye. The mean value of the recession of exophthalmic eyes after operation was mean 4 0 mm. Conclusion Two orbital walls decompression is an effective method for compressive optic-neuropathy in Gaves ophthalmopathy.

Objective To observe the clinical and pathological characteristics of choroidal metastatic carcinoma from lung carcinoma. Methods The clinical and pathological data of 6 patients with choroidal metastatic carcinoma from lung carcinima were analysed retrospectively. Results All the 6 patients had severe visual impairment, including 3 with severe ophthalmalgia. Flat neoplasm were seen in the posterior pole of the eyes in all the 6 patients and retinal detachment were found in 5 patients. Fundus fluorescein angiography (FFA) examination had been performed on 1 patient and blocked fluorescence and hyperfluorescence were seen in the lesion with pinpoint fluorescein leakage loop around it. CT examination had been performed on 3 patients and the shadow of flat homogenous tumor was seen. MRI examination had been performed on 1 patient and high signal intensities on T1W and low signal intensities on T2W were found. In all the 6 patients with primary lung carcinoma, 5 were diagnosed with adenocarcinoma and 1 with cellule carcinoma through pathological examination, and 5 patients were diagnosed with choroidal metastatic carcinoma from adenocarcinoma and 1 with choroidal metastatic carcinoma from cellule carcinoma through pathological examination. Conclusion Rapid visual acuity decrease, severe ophthalmalgia, flat neoplasm in ocular fundus and secondary retinal detachment are the main clinical characteristics of the choroidal metastatic carcinoma from lung carcinoma. Most histopathological manifestations of the metastatic carcinoma like that of the primary focus, and adenocarninoma is the most common histoclassification.

ObjectiveOptic nerve stimulation with penetrating electrode.is a new method for developing visual prosthesis.A simulation system was developed with computer software MATLAB to investigate its mechanism.MethodsVolume conductor model of optic nerve and optic nerve fiber model were developed.With the stimulation of monopolar penetrating electrode,the excitation thresholds of fibers at different depth were calculated.The activating function and activation region were employed to characterize the external stimulation effect.The impact of different parameters on stimulation effects were explored by changing the fiber diameter and the stimulation pulse width.Results Excitation thresholds increased as well as the percentage of activated fibers with the increase of electrode-fiber distance.Excitation threshold of the same depth fiber decreased as the fiber diameter increased,and the longer the electrode-fiber distance was,the more significant the drop was.Excitation threshold of the same depth fiber decreased as the pulse width of monophasic rectangle wave increased.The excitation threshold of the fiber at the same depth hardly changed for pulse durations greater than 0.5 ms.ConclusionThe simulation results indicates that optical nerve stimulation can be realized with penetratingelectrode,and different stimulation parameters can produce different activation effects.The present results providetheoretical guidance for the design of experiments.

Objective　To investigate clinical manifestation and pathologic changes of corneal incision rupture at different stages and the cause of incision rupture after abortive trauma.Methods　Three removal eyeball obtained from RK for severe incision rupture by abortive trauma were fixed with formalin, embedded with paraffin, sected stained by HE and observed under light microscope.Results　The eyeball distorted, intraocular structure disordered and vision lost severely in 3 eyes. Epithelial plugs were found in superficial layer of stroma and Bowman's layer broke and displaced in three cases. Healing and gap of incision presented 29 days after RK in 1 case. There were incision scar, collagen disarrangement and epithelial island in deep incision more than 2 years following RK in two cases, descent's layer broke in 1 case.Conclusion　RK can weaken the eye which will rupture easily and their visual function will be disturbed severely after abortive trauma.

ObjectiveIn this paper a new application of LABVIEW in neural electrophysiological simulation was applied to simulate axonal excitability.MethodsA variety of axonal excitability of the squid giant axon was modeled with LABVIEW,including action potential threshold,refractoriness,temporal summation,anode break excitation,repetitive firing and conduction velocity.ResultsThe LABVIEW program accurately described the permeability changes of Na+ and K+ and their effects on the action potential,and the membrane excitability had been well predicted.ConclusionThe graphical programming language of LABVIEW allows the user to complete the programming by dragging and dropping icons and connecting wires,the users can quickly and easily construct their own biological research systems.

To probe the effect of paeoniflorin on periovular granuloma and liver fibrosis in mice infected with Schistosoma japonicum in different times of infection and the treatment with praziquantel (PZQ). The models of hepatic fibrosis induced by S.japonicum were established by exposure of BALB/c mice percutaneously through the tail to cercariae of S.japonicum. and mice with treatment were randomly divided into 3 groups: i.e. groups of pre-treatment (I), group of simultaneous treatment (Ⅱ) and group of post-treatment (III). All groups, except the normal control group, were orally introduced with PZQ. And mice in the paeoniflorin-treated group and control group were separately introduced with paeoniflorin and 0.5% sodium carboxymethycellulose respectively. The treatments in group I, II and III were started 30 days before PZQ usage, simultaneously with PZQ or 30days-after PZQ usage respectively. Mice in these groups were sacrificed on the 102, 132 or 162 days after infection. Then the serum levels of hyaluronic acid (HA), amino-terminal peptide of type III procollagen (PIIIP) and liver hydroxyproline (Hyp) were detected. The histopathology was examined by HE and Masson staining; the degree of hepatic fibrosis and the area of egg granuloma were analyzed. The expression of collagen I was examined by immunohistochemical method. It was found that the area of granuloma and degree of hepatic fibrosis in the paeoniflorin-treated groups in group I and III were significantly lower than those in the model control groups. Also, paeoniflorin could induce decreas expression of collagen I. Meanwhile the levels of serum HA, PIIIP and liver Hyp were all reduced in comparison with those in the control group (P<0.05 or P<0.01). However, in group Ⅱ, no significant difference was noted between the treated and the control group in most data. Paeoniflorin also showed the effects to reduce the size of periovular granuloma and to reduce the expression of type I collagen, thereby to resist the development of hepatic fibrosis caused by S. japonicum.-It is evident that PAE shows an efficaciously therapeutic effect on the development of liver fibrosis of shistosomiasis, whenever it is administered before or after the usage of schistosomicides.