Epigenetic regulation involved in eukaryotic gene expression plays an important role in the progression of colorectal cancer. Colorectal cancer epigenetics is evolved in DNA methylation which is associated with the activation of oncogene and inactivation of tumor suppressor gene. The potential reversibility of DNA methylation offers exciting opportunities for therapy and diagnosis of colorectal carcinoma.

Despite a combination of all available treatment, the mortality of liver failure is very high,especially in children patients. Artificial liver support methods have been tested for over 50 years. Standard techniques of blood purification like hemodialysis, adsorption, hemo or plasma filtration as well as bioreactorbased approaches using liver cells or tissues have been used. It' s believed that the damaged liver has the ability to return to normal. Artificial liver support systems are expected to be useful for temporary support of liver function. If the liver does not regenerate to normal functions, an artificial liver support system may be useful as a bridge to liver transplantation. In conclusion, artificial liver support method appears to be a reliable therapy for advanced liver diseases and has significantly decreased the mortality of liver failure. Artificial liver support system has been used in children patients as well, but it still needs more researches.

ObjectiveTo explore the effect of aerobic exercise on serum leptin,interleukin-18 (IL-18),soluble intercellular adhesion molecule-1 (sICAM-1),C reaction protein (CRP) concentration,and homeostasis model assessment insulin resistance (HOMA-IR) of patients with metabolic syndrome ( MS),and to explore its mechanism.MethodsForty sedentary patients with MS were randomly divided into exercise group and fenofibrate group.Patients in exercise group were trained at anaerobic threshold intensity (30 min/times) for 12 weeks (5 times/wk).Patients in fenofibrate group were treated with fenofibrate 200 mg every night.Serum leptin,IL-18,CRP,and sICAM-1 concentration were measured by enzyme linked immunosorbent assay (ELISA).Twenty healthy subjects were selected as the control group.ResultsSerum concentration of leptin [ ( 26.04 ± 9.07 ) ng/ml vs ( 8.32 ± 2.94 ) ng/ml,t =12.72,P ＜0.01 ],IL-18[ (308.27 ±50.39)pg/ml vs (230.60 ±29.15)pg/ml,t =6.41,P ＜0.01 ],CRP[ (2.65±0.57)ng/ml vs ( 1.26 ±0.23) ng/ml,t =9.69,P ＜0.01 ],sICAM-1 [ (331.89 ±60.08) ng/ml vs (246.43±39.32)ng/ml,t =5.98,P ＜0.01],and HOMA-IR(4.38 ±2.06 vs 2.12 ± 0.50,t =4.81,P ＜ 0.01 ) of patients with MS were significantly increased compared to the control.Serum concentration of leptin[(26.38±10.85)ng/ml vs (19.63 ±6.27)ng/ml,t =2.22,P ＜0.05],IL-18[(309.40 ±49.77)pg/ml vs (291.80 ±39.21)pg/ml,t =2.33,P ＜0.05],CRP[ (2.73 ±0.72)ng/ml vs (2.28 ±0.38)ng/ml,t =3.41,P ＜0.01 ],sICAM-1 [ (333.85 ±55.97) ng/ml vs (306.24 ±50.55) ng/ml,t =3.16,P ＜0.01],and HOMA-IR(4.53 ±2.39 vs 2.89 ±0.69,t =2.87,P ＜0.01 ) were significantly decreased after training for 12 weeks.ConclusionsAerobic exercise is one of the effective treatments of patients with MS.Its underlying mechanism may be associated with reduction of serum inflammatory adipokine concentration,and improvement of vascular endothelial function and insulin resistance.

Objective To study the mechanism of toxicity of hexane. Methods SD rats inhaled 15 g/ma n-hexane statically for 8 hours. Results The levels of GSH in whole blood of rats declined significantly (t-test,P＜0. 01). The levels of MDA in serum of rats revealed increasing trend but without statistical significance (t-test,P＞0. 05). The activities of SOD and GSH-Px in liver of rats decreased significantly (t-test,P＜0.01). Conclusion n-Hexane could induce or enhance the reaction of oxygen free radical in organism,and result in damages of lipid peroxidation,which might be one of the mechanisms of the toxicity of alkane.

Objective To evaluate retrospectively the efficacy of cistema magna plastic repair in the treatment of Chiari malformation complicated with syringomyelia Methods Fifty-one patients suffered from Chiari malformation complicated with syringomyelia were treated in our department from May 2004 to October 2009. Seventeen patients received cistema magna plastic repairment (the decompression of posterior cranial fossa, duraplastic repair,resection of hernia below cerebellar tonsil and separation of adherence of arachnoid membrane). Results Clinical symptoms disappeared or improved in 15 cases (effective rate of 90%). MRI showed tonsillar herniation disappeared,syringomyelia narrow. MRI showed cistema magna plastic repair, syringomyelia disappeared or significantly thinned and spinal cord subarachnoid space widened. Effective treatment obtained in 12 cases (effective rate 70%). Conclusions The efficiency of Cistern magna plastic repair treating Chiari malformation with syringomyelia is satisfied.

Objective To investigate the clinical values of loop electrosurgical excision procedure (LEEP) in diagnosis and treatment of cervical intraepithelial neoplasia(CIN). Methods Fifty-two patients with cervical intraepithelial neoplasia underwent LEEP following cytology, colposcopy and multiple biopsies, were treated by LEEP. The cure rate, the operative time, bleeding volume and patients reaction of LEEP to the cervical intraepithelial neoplasia were investigated during the follow-up. Results The effective rate was 98.07 % in the patients treated by LEEP. The effective rate was 100 % in the patients in grade CIN Ⅰ or CIN Ⅱ by LEEP. No patients in grade CIN Ⅰ and Ⅱ had recurrence during the follow-up 1 year. The mean operative time was 7.8 minutes. The mean bleeding volume was 10 ml. No secondary bleeding and post-operative infection occurred. All these surgical specimens were checked successfully for pathology diagnosis. Conclusion The advantages to use the LEEP to manage cervical intraepithelial neoplasia include its simpleness to handle, short operative time,less bleeding, less vaginal discharge, safety, and high cure rate. LEEP can offer intact sample for pathological diagnosis. LEEP electrotome is a very ideal therapy for the cervical intraepithelial neoplasia, and can block the development of precancerosis to infiltrating carcinoma effectively.

AIM: To quantitatively detect the expression level of transforming growth factor-β1 (TGF-β1) and transforming growth factor-β2 (TGF-β2) genes in the retina of normal rat in order to determine the expression difference of TGF-β1 and TGF-β2 in retina.METHODS: The total RNA was isolated from which the first strand of cDNA was prepared. The mRNA levels of TGF-β1 and TGF-β2 were detected quantitatively by real time polymerase chain reaction (PCR).RESULTS: The mRNA levels of TGF-β1 and TGF-β2 were 0.0008±0.0003 and 0.0378±0.009, respectively. Expression of TGF-β2 was obviously higher than that of TGF-β1 in rat retina with statistical significance (t=12.37, P<0.001). The ratio of TGF-β2/TG-β1 was 55.00±26.61.CONCLUSION: QRT-PCR could specifically and accurately detect gene expression level in rat retina. In retina the TGF-β2 gene was expressed more abundantly than TGF-β1. It is suggested that TGF-β2 play an important role in retina diseases.

AIM: To quantitatively investigate transforming growth factor-β type Ⅰ receptor (TβRⅠ) and transforming growth factor-β type Ⅱ receptor (TβRⅡ) gene expressions in rat retina.METHODS: Sprague-Dawley rats were chosen in this research. Gene expression was detected quantitatively by reverse transcription polymerase chain reaction (RT-PCR) analysis. RESULTS: The expression level of TβRⅠ and TβRⅡ were 0.00034±0.00013 and 0.0001±0.00005, respectively. The expression level of TβRⅠ was obviously higher than that of TβRⅡ in the rat retina with statistical significance (P<0.01). The ratio of TβRⅠ/TβRⅡ was 3.9±1.7.CONCLUSION: Real time quantitative RT-PCR is an effective method to detect differential expression genes in retina. The change of TβRⅠ/TβRⅡ expression may play an important role in the pathogenesis of retinopathy, which could be further investigated in its significance in the development of proliferation retinopathy.

AIM: To detect the gene expression of TGF-β2 in retinas of diabetic rats at different stages, to observe and analyze the effect of TGF-β2 on the retinas of diabetic rats, to explore the role of TGF-β2 in pathogenesis of diabetic retinopathy (DR), and to provide experiment data and experience for further clinic studies.METHODS: Sprague-Dawley (SD) rats were used and retinas were dissected. The total RNA was isolated from which the first strand of cDNA was prepared. Diabetes mellitus was induced by a single intraperitoneal injection of 60mg/kg streptozotocin (STZ) and the rats were held without insulin treatment until sacrifice. Besides, agematched rats treated with saline were used as controls. Tail vein blood glucose was measured after 2 days and rats were considered hyperglycemic if blood glucose reading>16.7mmol/L. Animals with blood glucose level<16.7mmol/L were excluded from the study. The rats were killed at the 4th, 8th, 12th, 16th, 20th and 24th week respectively after hyperglycemic models were established. The retinas were separated and preserved in liquid nitrogen. The expressions of TGF-β2 gene mRNA were detected by reverse transcription PCR (RT-PCR).RESULTS: The RNA of rat retina was integrative enough to be used to further carry out PCR analysis. Compared with control groups, the expression of TGF-β2 mRNA in retinas of diabetic rats was up-regulated at the 4th week, but there was no statistical difference (P>0.05); it was down-regulated at the 8th week, and there was statistical difference (P<0.05); it was also down-regulated at the 12th week, and there was statistical difference (P<0.05); at the 16th week there was no statistical difference (P>0.05); it was up-regulated at the 20th week, but there was no statistical difference (P>0.05); it continued to be up-regulated at the 24th week, and there was statistical difference (P<0.05).CONCLUSION: Since the expression of TGF-β2 mRNA in retinas of diabetic rats was down-regulated at the 8th week and 12th week statistically, up-regulated at the 24th week statistically, it has obviously shown that TGF-β2 was down-and up-regulated through the period of DR. That is, its changes are diphasic with time. It may confirm that TGF-β2, with the characteristic of diphasic regulation, played an important role in DR. It is necessary to study it furthermore.

Human cytomegalovirus (HCMV) has a higher prevalence in the population, and most normal individuals after primary infection can establish latent infections. Recent reports have suggested that cytomegalovirus infection associated with lipid metabolism, and play an important role in the pathogenesis of many diseases, such as hepatitis, atherosclerosis, isolated syndrome, metabolic syndrome, etc. This article summarized the relationship between cytomegalovirus infection and lipid metabolism, as well as its role in a variety of diseases progression.