Objective To investigate the ingestion, metabolism and subcellular localization of indocyanine green (ICG) in human retinal epithelial (R PE) cells.Methods RPE cells were incubated with 0.25 mg/ml ICG under the condition of 37oC in the camera. The ICG granule and ultrastructure of RPE cells were observed under the electron microscopy after 1, 4, and 24hour incubation, and the ICG autofluorescence was detected by fluorescence microscopy after the incubation for 1, 2, 4, 8, 12, 24, and 48 hours, respectively. The ab sorbency (A value) of ICG solution was measured at 805 nm with ultraviol et/v isible specrtrometer. The standard curve of concentration of ICG was drawn and the related equation of concentration of ICG and the A value was calculated. After being incubated for 1, 2, 4, 8, 12, 24, 48, and 72 hours, respectively, the A value of supernatant fluid was calculated according to the equation. Aft er incubated with ICG for 24 hours, one sample was observed under electron microscope and fluorescence microscope per week to evaluate the metabolizable period of ICG .Results ICG granules were distributed evenly after entering the RPE cells. After incubated with 0.25 mg/ml ICG for 24 hours, no significant change of the ultrastructure of the RPE cells was found. ICG granules accu mulated in the cells as the time goes by and reached the peak after 24 hours, and then they decreased because of the slowdown of the metabolism. Few ICG was still remained in the cells 1 week later Conclusions RPE cells may take in ICG actively. ICG metabolizable period in RPE cells is long, which may be one of the mechanisms of the toxicity of ICG to the retina in the vitreous operation.(Chin J Ocul Fundus Dis，2004，20：179-181)
As a kind of mechanical effector cells, chondrocytes can produce a variety of physical and chemical signals under the stimulation of multiaxial load in vivo, which affect their own growth, development and apoptosis. Therefore, simulating the mechanical environment in vivo has become a research hotspot in the culture of chondrocytes in vitro. Although a large number of reports have fully proved that different mechanical stimulation can regulate the metabolism of chondrocytes, the loading scheme has not been agreed. Starting from different mechanical forms, this review will explore the differences in the regulation of chondrocyte metabolism by different mechanical stimuli, so as to find an advantage scheme to promote the growth and proliferation of chondrocytes and to develop a more stable, effective and reliable experimental strategy.
ObjectiveTo review the role of dendritic cells (DC) in immune metabolism of rheumatoid arthritis (RA). MethodsLiterature on the role of DC in the immune metabolism of RA was extensively reviewed in recent years, and the metabolic characteristics of RA, the role of DC in RA, the correlation between the immune metabolism of DC and pathogenesis of RA, and the treatment were summarized and analyzed. Results DC promotes the progression of RA under hypoxia, increased glycolysis, inhibition of oxidative phosphorylation, and decreased lipid metabolism. Moreover, many DCs (especially conventional DC and monocyte-derived DC) have different functions and phenotypic characteristics in RA, which are closely related to the occurrence and development of RA. Conclusion DC plays an important role in the immune metabolism of RA, and immunometabolism therapy based on DC can provide targeted therapy for the treatment of RA.
Objective To observe the expression and relationship of high-mobility group A(HMGA)1, HMGA2, MIB-1 labeling index (LI) and let-7 in retinoblastoma (RB). Methods Forty-four RB samples were studied, including 11 poorly-differentiated samples, 33 well-differentiated samples; eight invasive and 36 non-invasive samples. The expression of HMGA1, HMGA2 and MIB-1 LI in RB were analyzed by immunohistochemitry. The HMGA1, HMGA2 were scored on a scale of 0 to high expression. 0: no expression; low: 1%-10%; medium: 11%-50%; high: ＞50%. The MIB LI were scored on a scale of 0 to high expression. 0: no expression; low: 1%-40%; high: ＞40%. Semiquantitative reverse transcription-polymerase chain reaction was used to assay the let-7 expression level: ge;80% showed no significantly decreased expression; 60%-79% showed medium decrease in expression; ＜60% highly decreased in expression. ResultsIn 44 RB samples, there were 14 cases with no HMGA1 expression (32%), 11 cases with low expression (25%), 10 cases with medium expression (23%), and nine cases with high expression (20%). Expression level of HMGA1 was significantly higher in poorly differentiated RB than in well-differentiated RB (chi;2=11.3,P＜0.01); however, no statistically significant difference was found between invasive tumors and noninvasive tumors (chi;2=5.9,P＞0.05). There were 11 cases with no HMGA2 expression (25%), 11 cases with low expression (25%), nine cases with medium expression (20%), and 13 cases with high expression (30%). Expression level of HMGA2 was significantly higher in poorly differentiated and invasive RB than in well-differentiated and noninvasive RB respectively (chi;2=20.9, 8.7;P＜0.05). There were 4 cases with no MIB-1 LI expression (9%), 18 cases with low expression (41%), and 22 cases with high expression (50%). Expression level of MIB-1 LI was significantly higher in poorly differentiated RB than in well-differentiated RB (t=5.2,P＜0.05). Higher expression of MIB-1 LI was found in invasive tumors than in noninvasive tumors, with no significant difference (t=-1.1,P＞0.05). Twenty-seven cases had no significantly decreased expression of let-7 (61%). There were eight cases with medium decreased expression (18%) and nine cases with highly decreased expression (21%). Correlation analyses revealed that MIB-1 LI expression significantly correlated with HMGA1and HMGA2 proteins (r=0.327, 0.602;P＜0.05). A significantly inverse correlation existed between let-7 expression and HMGA1, HMGA2 proteins and MIB-1 LI respectively (r=-0.247,-0.310,-0.392;P＜0.05). Conclusions Overexpression of HMGA1, HMGA2 and MIB-1 LI and down regulation of let-7 were demonstrated in RB. Supplying let-7 to RB cells can possibly inhibit HMGA1 and HMGA2 expression.
Objective
To discuss the correlation between the letpin level and the pathogenesis of avascular necrosis of the femoral head (ANFH) by measuring the leptin expression of the femoral head in patients with ANFH.
Methods
Between July 2009 and February 2011, 16 patients with ANFH (including 10 cases of steroid-induced ANFH and 6 cases of alcohol-induced ANFH, ANFH group) and 11 patients with proximal femur fracture (control group) were included in the experiment. There was no significant difference in age, weight, and body mass index between 2 groups (P gt; 0.05). The peripheral blood and bone marrow were extracted to measure the blood lipid level and the free fat (FF) content, respectively. ELISA was used to detect the levels of the leptin, soluble leptin receptor (sLR), osteoprotegerin (OPG), and soluble receptor activator of nuclear factor κB (sRANKL); the leptin biological activity and the activity of osteoclasts were calculated. The femoral head specimens were harvested to count leptin-positive cells by immunohistochemical staining.
Results
No significant difference in the blood lipid level was found between 2 groups (P gt; 0.05), but the FF content in ANFH group was significantly lower than that in control group (t=
—
14.230, P=0.000). The intramedullary leptin expression was found in both groups; however, the intramedullary leptin level in ANFH group decreased significantly when compared with the level in control group (t=4.425, P=0.002). There were significant differences in the levels of leptin, OPG, and sRANKL between 2 groups (P lt; 0.05). The leptin biological activity of ANFH group was significantly lower than that of control group (P lt; 0.05), but the activity of osteoclasts of ANFH group was significantly higher than that of control group (P lt; 0.05). There was a positive correlation between the leptin level and leptin biological activity (r=0.922 7, P=0.000 0), and a negative correlation between the leptin level and OPG content (r=
—
0.396 2, P=0.040 8), FF content (r=
—
0.806 1, P=0.000 0), while it had no correlation between the leptin level and sLR and sRANKL content (P gt; 0.05).
Conclusion
Intramedullary expression and bioactivity of the leptin decrease significantly in ANFH patients, which may play an important role in the pathogenesis of ANFH.
Objective To investigate the pathological characteristics of hepatic energy metabolism changes following hepatic inflow occlusion and the tolerant limit to ischemia in cholestatic rats.Methods On the day 7 after rats biliary obstruction, the survival rate, hepatic mitochondrial respiratory function, content of ATP, and the ketone body ratio in arterial blood were investigated following the different duration of hepatic ischemia and reperfusion with portal blood bypass.Results The survival rate on postoperative day 10 was 100%, 100% and 40% subjected to 30, 60 and 90min of hepatic vascular occlusion. The hepatic energy metabolic function was decreased markedly following ischemia, and was increased markedly on 24 hours following reperfusion subjected to 30, 60min of hepatic vascular occlusion, but it had less increase with 90min of hepatic vascular occlusion.Conclusion The hepatic energy metabolic function injury is reversible in cholestatic rats, and the rats can tolerate hepatic inflow occlusion within 60min, but the hepatic energy metabolic function injury is irreversible after 90min of hepatic occlusion.
Endocrinology is closely related to lipid metabolism. Lipotoxicity affects the abnormal function of various endocrine organs, and leads to diabetes, fatty liver, metabolic syndrome and other endocrine and metabolic diseases. It is an important strategy to prevent the lipid toxicity. Endocrine disorders can also cause dyslipidemia. Studies have found that thyroid and gonadal glands play an important role in lipid metabolism. Their molecular mechanisms are gradually revealed and will be a new therapeutic target for dyslipidemia. Lipid metabolism disorders play an important role in the development of endocrine and metabolic diseases.
Objective
To observe the changes of expression of glutamine synthetase (GS) in early diabetic ratsprime; retina and investigate its possible mechanism.
Methods
Three groups of streptozotocininduced diabetic models of SpragueDawley (SD) rats with different diseased courses, ie, 1 month, 2 months, and 3 months, respectively, with 8 rats in each group, and 8 normal ones as control were examined. The expressions of GS, interleukin-1beta; (IL-1beta;) and c-Jun in retina in the 4 groups were detected by indirect immunofluorescence and western blotting techniques. Meanwhile, different doses of IL-1beta;（0,100,500,and 1000 ng/ml） were injected into the vitreous cavities of 32 normal rats (8 rats in each group), and 24 hours later, the expressions of GS and c-Jun in retina were detected by the same methods.
Results
The expression of GS in retina did not changed in control group or in 1 month and 2 months group, but decreased obviously in 3 months group comparing with which in the control group (Plt;0.01).The expressions of c-Jun and IL-1beta; in retina in control group were very low, but increased gradually in diabetic rats in 1-3 months group, which significantly differed from which in the control group (Plt;0.01). Vitreous injection with IL-1beta; (500 and 1000 ng/ml) down regulated the expressions of GS, and the expression of c-Jun increased in a dose-dependent way after injection with IL-1beta; at the concentration of 100 ng/ml.
Conclusions
In early diabetic ratsrsquo; retina, IL-1beta; may down regulate the expression of GS. The possible mechanism may be the activation of c-Jun by IL-1beta;.
(Chin J Ocul Fundus Dis,2007,23:260-264)
Objective To study the latest research progress of the formation mechanism of cholesterol stone disease and forming factors of cholesterol stone disease and to provide new theoretical level and develop a new development direction for guiding clinical application. Methods The related literatures at home and abroad were analyzed, compared and summarized, and the current relevant research dynamic of cholesterol stone disease was sketched. Results The formation of cholesterol gallstone is closely related to the abnormal levels of serum lipids metabolism, bacterial and viral infection, and the expression of genes related to cholesterol gallstone. Conclusions The formation of cholesterol calculus disease is a kind of interaction and intricate disease process involving of environmental factors, genetic factors, and biological factors. Although there has been a lot of blood lipid, protein correlation research with cholesterol stone, there are also many studies such as using gene transplantation and gene knockout, but gene technology of cholesterol stone disease diagnosis and treatment is expected to become the new hot research topic.
Objective
To study relationship between hemoglobin-AGE (Hb-AGE) levels and diabetic retinopathy (DR) in diabetics.
Methods
Hb-AGE content of 125 type 2 diabetic patients with or without DR was measured by competitive ELISA technique and compared with that of 50 normal controls.
Results
Hb-AGE level in type 2 diabetic patients was 65% higher than that in normal individuals (Plt;0.01), and Hb-AGE level in the patients with DR was significantly higher than patients with DR was significantly higher than that in those without DR (Plt;0.05). It was found that fasting plasma glucose (FPG) level was not directly correlated with Bb-AGE levels and development of DR ,but HbAc,plasma lipid and blood pressure were related to the both (Plt;0.05 or Plt;0.01). Multivariate analysis showed that there was closer relationship between seriousness degree of DR and Hb-AGE (partial correlation coefficient was 0.604,Plt;0.001).
Conclusion
Diabetic control is related to alterations in vivo Hb-AGE,which may contribute to occurrence and developement of DR in type 2 diabetes mellitus.
(Chin J Ocul Fundus Dis,2000,16:147-149)
