The rapid development of human micro-ecology (human microbiome) in recent years has opened up new medical prospects for revealing the close relationship between microorganism and human health and disease.As the second genome of human,the special relationship between the microorganism and the host and its important function have brought new ethical and social problems,which requires to rethink and reform the existing ethical norms.This paper focused on the seven perspectives of “identity”,ownership,informed consent,risk benefit assessment,privacy,commercialization and public health,and demonstrated the importance to construct the ethics of micro-ecological research,which would enrich and expand the connotation of bioethics in theory and better guarantee the benign development of micro-ecology research in practice.

0.05). The blood CD + 8 in IBS group was higher than that in control group ( P 0.05). Conclusions The peripheral blood lymphocytes count in IBS was not significantly different from the controls, the number of CD + 3 T lymphocytes was normal in IBS, but CD + 8T lymphocytes was higher, CD + 4 was lower, and CD4/CD8 ratio was decreased in IBS patients as compared with the controls. The results of this study indicated that the patients with diarrhea type IBS might be associated with hypo immunity.

Objective To study the association of ubiquitin carboxyl-terminal hydrolase L1 (UCHL1) promoter region methylation with human esophageal cancer. Methods Promoter region methylation of UCHL1 was dctcctcd by rnethylation specific PCR (MSP) in esophageal cancer cell lines and tissue samples.The expression of UCHL1 was detected by semi-quantitative RT-PCR and Western blot in esophagcal cancer cell lines.5-Aza-2'-deoxycytidine (5-Aza) was applied to reactivate methylated cell lines.ResultsComplete methylation of UCHL1 promoter region was detected in 8 cell lincs (KYSE30,KYSE150,KYSE140,KYSE450,KYSE510,TE3,TE7,TE10).Loss of UCHL1 expression was found in7 cell lines ( KYSE30,KYSE150,KYSE140,KYSE450,KYSE510,TE3,TE7).Reduced expression was found in TE10 cell line. Promoter region hypermethylation was correlated with UCHL1 expression in esophageal cancer cell lines.Re-expression of UCHL1 was induced by 5-Aza treatment in KYSE150 and TE3 cell lines.UCHL1 was frequently methylated in human primary esophageal cancer (74.51％,38/51 ),while no methylation was detected in normal esophageal mucosa (0/10). No association was found between promoter region methylation and age,gender,tumor location,tumor stage or lymph node metastasis.Conclusions UCHL1is silenced by promoter region hypermethylation in human esophageal cancer.Methylation of UCHL1 is frequently happened to primary esophageal cancer and may play an important role in the tumorigenesis.

Objective To study the effects of internal and external biliary drainage on inducible nitric oxide synthase (iNOS) mRNA expression of Kupffer cells and serum tumor necrosis factor-alpha (TNF-α) in rats with obstructive jaundice. Methods Forty-eight male Sprague-Dawley rats were randomly assigned to obstructive jaundice (OJ), sham operation (SH), internal biliary drainage (ID) and external biliary drainage (ED) groups with 12 each. Kupffer cells were isolated by in situ hepatic perfusion and digestion with collagenase type Ⅳ, and purified by cell culture attachment. The expression of iNOS mRNA of Kupffer cells was detected by reverse transcription polymerase chain reaction (RT-PCR) and the serum TNF-α concentration was measured using ELISA method. Results The serum TNF-α level was increased in OJ group[ (110.84±26.3) pg/ml ]compared with SH group [-(88.4±17.9) pg/ml, (P=0.045)]. The TNF-α level in ID group[ (89.8±28. 3) pg/ml ]was significantly lower than that in ED group[ (118.64±22.7) pg/ml, (P=0. 011) ]and OJ group (P=0. 059). Expression of iNOS mRNA of Kupffer cells was significantly higher in OJ group (0. 824± 0. 24) compared with SH group (0. 384±0.35,P=0. 005). After relieving the OJ, the iNOS mRNA expression in ED group (0. 974± 0.48) was not suppressed (P=0. 321). On the contrary, the iNOS mRNA expression in ID group was suppressed and significantly lower than that in ED group (0. 59±0. 35) (P=0. 016). Conclusions Internal biliary drainage is superior to external drainage in terms of reversing the elevated serum TNF-α and in suppressing the iNOS mRNA expression of Kupffer cells in rats with obstructive jaundice.

Objective To study the effects of intragastric ice water stimulation on bowel sensitivity, mast cells (MCs), the serum contents of serotonin (5-HT), leukotriene B 4 (LTB 4 ), histamine(HA)and bradykinin (BK) in rats, and explore the possible pathogenesis of cold drinks-induced irritable bowel syndrome (IBS). Methods 40 Wistar rats aged 4 weeks were randomly divided into two groups. Twenty rats of group A as experimental group were gavaged 0-4℃ ice water for 14 days, and the rats of group C as control group were not treated. On day 28, the group A and group C were again divided into two subgroups, respectively, i.e. A1, A2, C1, and C2. In the rats of subgroups A1 and C1, a balloon was introduced into the rectum of each animal, and number of abdominal withdrawal reflexes (AWR) was recorded after the balloon was distended for 3 minutes to assess bowel sensitivity. One hour after rectal distention, blood sample of each rat was collected from the heart for the measurement of the contents of 5-HT, LTB 4 , HA and BK in serum by enzyme linked immunoadsorbent assay (ELISA). Tissues harvested from the ileocecal junction and colon were sectioned and stained with haematoxylin-eosin (HE) for routine pathological examination, and with the improved toluidine blue method for the identification of MCs. Results The number of AWR to 1.0ml balloon distention in subgroup A 1 was significantly lower than that in subgroup C 1 (P0.05). Routine pathological examination did not show abnormality in both subgroups. In group A 1 , the numbers of MCs in the ileocecal junction and colon were significantly higher than those of group C 1 (P0.05). Conclusion The stimulation of the stomach with ice water results in lowering of bowel sensitivity, increase of MCs and elevation of serum contents of 5-HT, LTB 4 and HA, and the results might imply that cold stimulation of the stomach might play a role in the pathogenesis of IBS.

Objective To determine the efficacy of endoscopic treatment for chronic pancreatitis(CP).Methods The clinical data of CP patients in our department from December of 2000 to March of 2009 were reviewed retrospectively.Results 77 patients had been successfully followed up.The short-term clinical symptom remission rate was 86.9% and the long-term 61.0%.9 patients underwent surgery after endoscopic treatment during the follow-up.The incidence of complications related to endoscopic treatment was 5.1% including post-ERCP(endoscopic retrograde cholangiopancreatography) pancreatitis,hemorrhage,cholangitis and perforation.No death related to endoscopic treatment occurred.Conclusion Endoscopic treatment for CP is safe and effective.

Objective: In recent years,botulinum toxin type A(BTX-A) has been investigated for the treatment of pain.This experiment was to investigate the antinociceptive effect of BTX-A intraperitoneal injection on visceral pain of rats and its effect on intestinal AChE and SP expression.Methods: 72 male adult Wistar rats were divided into four groups: BTX-A(2U,4U,and 6U) or vehicle(2ml) was injected intraperitoneally in B,C,D and A group.6 Rats of every group were challenged with acetic acid intraperitoneal injection after 1,4 and 8 weeks respectively.After abdominal writhing behaviors were monitored,the intestinal samples were immunohistochemical stained for AChE and SP examination.Results: At the end of one week,writhing test scores of rats in group C and D were decreased significantly compared with group A(P

Objective To understand the spectroscopic property of AO-H2SO4-KBrO3-naphthol system and the enhanced mechanism of resonance light scattering(RLS),and to develop a method for the determination of trace naphthols in urine.Methods In the dilute H2SO4 medium,naphthols could react with KBrO3 and AO to form ion-association complexes,which produced a new RLS spectrum and resulted in the great enhancement of RLS.The characteristics of RLS spectrum,three-dimensions fluorescence spectrum,absorption spectrum and fluorescence spectrum and the optimum conditions of reaction were studied.Results The enhanced intensity of RLS was 468 nm.The linear range was at 1.41?10-7-2.80?10-5 mol/L for ?-naphthol,1.28?10-7-3.00?10-5 mol/L for ?-naphthol.The relative coefficient and the limits were 0.999 6 and 0.422?10-7 mol/L,0.999 3 and 0.385?10-7 mol/L for ?-naphthol and ?-naphthol,respectively.The urine samples analysis of the relative standard deviation was 4.8%-7.3% and the average recovery rate was 90.7%(n=6).Conclusion This method is sensitive,simple,rapid and applicable to the determination of trace naphthols in human urine.

Aging is a biological process and state characterized by morphological change, hypofunction and metabolic disorder, often accompanied by severe degenerative diseases, including amyotrophy, atherosclerosis, neurodegeneration, and so on. Age-related diseases not only decrease the life quality of the elderly, but also impose great burden on family and society. As population aging, we are increasingly coming to realize that the longevity we want should be healthy aging but not simple increase of lifespan. By researching on the yeast, C. elegans, drosophila, mice and humans, we get to know the mechanisms of aging and methods for anti-aging, such as dietary restriction and use of anti-aging drugs like rapamycin. In this review, we summarized mainly the studies on mechanisms of aging and elaborate associated anti-aging strategies and underlying mechanisms.

Objective To investigate the expressions of acetylcholine and norepinephrine of the central nervous system in a rat model of irritable bowel syndrome (IBS), and to explore the possible roles of the classical neurotransmitters of the central nervous system in the pathogenesis of IBS. Methods The rat model of IBS was reproduced by intragastric instillation of 2.0ml water at 0-4℃ in male Wistar rats for two weeks. Both the model group and the control underwent rectal distention, then were sacrificed by deep anesthesia. Sections of the posterior horn of the spinal cord and hypothalamus were obtained and processed immunohistochemically using anti-tyrosine hydroxylase (TH) and acetylcholinesterase (AchE) antibodies respectively, and the staining results were analyzed semi-quantitatively using computerized color image analyzer. The statistical difference of the opacity density and immunoreactive areas between two groups was compared by t-test. Results Immunoreactive area, opacity density of AchE immunoreactive tissues in the posterior horn of the spinal cord and hypothalamus of the model group were all significantly higher than those in control group (P0.05). Conclusions The expressions of acetylcholine in the spinal cord and hypothalamus in the rat model of C-IBS were abnormal, which suggested that cholinergic nervous system in the central nervous system may play some roles in the pathogenesis of IBS.