RESUMEN
To investigate the responsiveness of gastric tumor cells to the nonstructural protein [NS]1 of parvovirus H1, which has a preferential lytic growth cycle in cancer cells. This study was carried out in Shanghai Institute of Digestive Disease, Renji Hospital, Shanghai, China from 2009 to 2012. An NS1-expressing plasmid was introduced into gastric cell lines or nude mice bearing tumor grafts. Expression was monitored by tracking fluorescence tag and specific transcription. Tumor growth suppression was measured, and cell cycle dyshomeostasis was verified by flow cytometry. Cell cycle regulators' level was measured on both the transcription and protein level. Gastric cancer cells were efficiently suppressed in vitro, or in the xenograft mice model. The NS1 dependent tumor suppression was specific since plasmid-driven NS1 expression in some normal tissues, in particular, the lungs was not accompanied by adverse side effects. The NS1 expression was found to stall gastric cancer cells in the G0/G1 stage with accumulation of cycle regulator p21. The NS1 expression can suppress gastric cancer cell growth both in vitro and in xenograft model, probably through induction of the cell cycle regulator p21. These results support further development of the parvoviral NS1 protein as an anti-cancer effector
RESUMEN
BACKGROUND:Large-scale expansion of undifferentiated and multipotential adipose-derived stem cells using serum-free culture system is a difficult issue to be resolved. OBJECTIVE:To establish an in vitro culture system combined with the extracellular matrix in order to investigate the efficiency, effectiveness and security of extracellular matrix on expanding adipose-derived stem cells. METHODS:In vitro isolated adipose-derived stem cells were seeded in traditional two-dimensional plastic plates and extracellular matrix-coated plates supplemented with serum-free medium respectively. After in vitro expansion, total cellnumber, expression of cellsurface markers, cellsenescence degree and multipotent differentiation ability (adipogenic, osteoblastic and chondrogenic differentiation) of adipose-derived stem cells cultured under both conditions were detected and compared. Moreover, the clinical safety of adipose-derived stem cells expanded in extracellular matrix-coated plates was investigated. RESULTS AND CONCLUSION:Total cellnumber of passage 5 adipose-derived stem cells cultured in extracellular matrix-coated plates was 10 times more than that in traditional two-dimensional plastic plates. Flow-cytometric analysis showed that adipose-derived stem cells cultured with extracellular matrix expressed stem cellsurface markers. cellular senescence examination showed that almost al of passage 15 adipose-derived stem cells cultured with extracellular matrix showed no aging, while most passage 5 adipose-derived stem cells cultured by the two-dimensional system aged and lost their proliferation ability. Multidirectional induction of adipose-derived stem cells showed that passage 15 adipose-derived stem cells cultured with extracellular matrix could stil differentiate into adipocytes, osteoblasts and chondrocytes as passage 5 adipose-derived stem cells did, which performed much better than the induced differentiations of passage 5 adipose-derived stem cells cultured by the two-dimensional system. Karyotype analysis and in vivo invasion experiment insured the clinical safety of adipose-derived stem cells expanded with extracellular matrix. Al above results suggest a safe and more efficient expansion system of extracellular matrix for clinical application using the serum-free culture system combined with extracellular matrix.
RESUMEN
It's difficult to diagnose precancerous lesion and early cancer for a long time, because both of them haven't typical morphological characteristics. As a novel diagnostic modality, fluorescence endoscopy can accurately reflect minimal changes in human's tissue, thus making a meaningful progress for cancer diagnosing. 200 patients were examined by fluorescence endoscopy to evaluate the diagnostic value. The overall accuracy, sensitivity and specificity for detecting malignant gastrointestinal tumor was 94.0%, 94.6% and 93.5%, respectively. Thus, fluorescence endoscopy can be used to diagnose malignant gastrointestinal tumors with high validity and reliability, and is advantageous over conventional white light endoscopy especially in detecting the atypical and suspicious lesions. Furthermore, fluorescence endoscopy can also guide target biopsy, is significant to improve the early cancer detection rate, has a broad development prospect.
Asunto(s)
Humanos , Endoscopía , Fluorescencia , Neoplasias Gastrointestinales , Diagnóstico , Sensibilidad y EspecificidadRESUMEN
Objective To investigate the suppression effect of expressing parvovirus H-1 nonstructural protein 1 (NS1) gene on human gastric cancer cells and the possible mechanisms.Methods A recombinant enhanced green fluorescent protein (eGFP) labeled NS1 of parvovirus H-1 plasmid was constructed.Human gastric cancer cell line SGC7901 was transfected with recombinant plasmid (experiment group) or blank vector (negative control group) and blank control group was treated with equal amount of phosphate buffered saline (blank control group).After transfection,the distribution of fluorescent signal was observed under fluorescent microscope.The expression of NS1 at gene and protein level was measured.Cell growth curve of each group was drawn.The expression of cell senescence-associated β-galactosidase (SA-β-Gal) was tested.The changes of cell cycle were investigated by flowcytometry.Two groups' comparision was performed by t-test.Results After transfection,NS1 was expressed in SGC7901 cells at gene and protein level.Compared with negative control group,the fluorescent signal accumulated in cell nucleus in experiment group.The percentage of SA-β-Gal positive cell in experiment group ((30.5 ± 1.4) ％) was higher than that of negative control group ((4.4± 1.1) ％) and the difference was statistically significant (t =-12.931,P ＜ 0.01).The growth inhibition rate of SGC7901 cells from the first day to the fourth day was 45％,62％,73％ and 77％,respectively.The cell cycle of eGFP-NS1 expressed SGC7901 cells was arrested at G0/G1 phase.Conclusion Parvovirus H-1 NS1 play the role in cell nucleus of gastric cancer cell line SGC7901 and could make cell cycle arrested at G0/G1 phase,which effectively inhibited the proliferation SGC7901 cell.
RESUMEN
ObjectiveTo study the pathogcncsis of gastrointestinal vascular malformation (GIVM) and the potential mechanism of thalidomide in the treatment of gastrointestinal bleeding due to GIVM.Methods We collected the surgical intestinal specimens from 10 patients who suffered from massive hemorrhage of gastrointestinal tract owning to GIVM and the normal intestinal mucosa around the lesions,as well as normal intestinal mucosa from healthy subjects.Immunohistochemical(IHC) staining was carried out to investigate the differences of angiopoietin 2 ( Ang2 ),Notch1 and delta like ligand 4 (Dll4) in the above three intestinal mucosa to find the relationship with the pathogenesis of GIVM. Human umbilical vein endothelial cells(HUVECs) were cultured with 0,25,50,100 and 200 mg/L thalidomide for 24 or 48 hours to observe their mRNA and protein expressions of Ang2,Notch1,Dll4 by real-time PCR and Western blot.ResultsBy IHC staining,more expressions of Ang2,Notch1 and Dll4 in the lesions were detected than those in the normal intestinal mucosa around the lesions and the normal intestinal mucosa in healthy people.The expressions of Ang2,Notch1 and Dll4 were significantly correlated (P =0.016,r =0.732),and the expressions of Notch1 and Dll4 were absolutely correlated ( P =0.000,r =1.000).Real-time PCR and Western blot showed that thalidomide could down-regulate the expressions of them,which were in a concentration-dependent manner.ConclusionAng2,Notch1 and Dll4 may correlate with the pathogenesis of GIVM,while thalidomide can concentration-dependently down-regulate the expression of Ang2,Notch1 and Dll4,which may be one of the mechanism that thalidomide play a therapeutic role in GIVM.
RESUMEN
Objective To discuss the differential diagnostic value of confocal laser endomicroscopy (CLE)for benign and malignant non-protruding gastric lesions.Methods A total of 37 patients with nonprotruding gastric lesions diagnosed by conventional gastroscopy underwent CLE.Fluorescein sodium was intravenously injected,and target biopsy was obtained.Malignant lesionss diagnosed with CLE or biopsy were treated by endoscopy or surgery.Patients with benign lesions were give routine medication and followed up every 3 months until the lesions were cured.Results CLE diagnosed 11 malignant and 26 benign lesions.However,1 of 11 cancers was confirmed as benign by histopathology,while 1 of 26 benign lesions was confirmed cancer.Lesions in 12 patients were resected,with 3 by endoscopy,and 9 by surgery,and findings of post-operative pathology were consistent with those of target biopsy.No malignancy was found during the follow-up of benign lesions,and all lesions were healed after 3.16(3.58 ± 1.20)months.The sensitivity,specificity,and accuracy of CLE in diagnosis of malignant non-protruding gastric lesion were 90.9％,96.2％,and 90.9％,respectively.The positive and negative predictive values were 90.9％ and 96.2％,respectively.The Kappa value of CLE and histopathology was 0.871.Conclusion CLE is of significant value for the diagnosis of non-protruding gastric lesions,and may replace biopsy in real-time histological diagnosis.
RESUMEN
Objective To study the expressions of hypoxia inducible factor (HIF)-1 and angiopoietin (Ang)-2 in repeated gastrointestinal bleeding due to vascular malformation, and the efficacy of treatment with thalidomide. Methods Twenty-five patients with repeated gastrointestinal bleeding due to vascular malformation confirmed by capsule endoscopy or enteroscopy were collected and 18 subjects without severe diseases were served as controls. Ten patients with gastrointestinal vascular malformation, who received 25 mg of thalidomide 4 times daily for 4 months and were followed up for at least one year, were also enrolled. The serum samples from all participauts were detected for expressions of HIF-1 and Ang-2 using enzyme-linked immunosorbent assay (ELISA).The expressions of HIF-1 and Ang-2 were compared between angiodysplasia group and control group.The expressions of HIF-1 and Ang-2 were comparatively evaluated before and after treatment with thalidomide in treatment group. Results The expressions of HIF-1 and Ang-2 in vascular malformation group [( 113. 84 ± 26. 66 ) ng/ml and ( 652. 11 ± 140. 39) ng/ml, respectively] were significantly higher than that of control group [(43.28±17.30) ng/ml and (265.60±53.88) ng/ml,respectively, P=0. 000]. The expression of HIF-1 was positively associated with that of Ang-2. (r=0. 700, P= 0. 000). There was no difference in expressions of HIF-1 and Ang-2 before and after treatment with thalidomide (P=0. 498 and =0. 136, respectively). However, significant reduction of Ang-2 [(113. 80±73. 60) ng/ml(P=0. 003)] was found in 8 effectively treated patients after thalidomide treatment. Conclusions HIF-1 and Ang-2 might play an important role in the formation of vascular malformation. The extent of Ang-2 reduction after thalidomide treatment may be helpful in evaluating its efficacy or prognosis.
RESUMEN
Objective To evaluate the therapeutic effect of endoscopic cryotherapy for Barrett's esophagus (BE). Methods A total of 22 consecutive patients, who were diagnosed as BE from January 2008 to May 2009, underwent endoscopic cryotherapy by using pressurized gas of C02. The data including effective rate, therapy courses and procedure related complications were retrospectively analyzed.Results Except for 2 cases of withdrawal, the other 20 patients completed the treatment with a total therapy number of 42 times (mean 2. 1 times/patient) and were followed up for 6 months. Complete histologic reversal of BE mucus was achieved in all 20 patients after 1-3 times of cryotherapy, among whom complete endoscopic reversal was obtained in 9 and effective endoscopic reversal in 11. Histologic recurrence was observed in 3 cases during the follow-up, including 2 of occult intestinal metaplasia and 1 of mild intestinal metaplasia, which achieved a BE mucosal reversal rate of 85% (17/20). Procedure related complications included 1 case of esophageal ulcer and 3 cases of mild or severe esophagitis, which were all cured after acid suppression treatment. Conclusion Endoscopic cryotherapy in BE is effective and safe, with the advantages of easy manipulation, less complications and good compliances.
RESUMEN
Objective To investigate the expression of CD27-CD70 co-stimulatory pathway in peripheral circulation and intestinal mucosa of patients with inflammatory bowel disease, and to find the difference between the expression of CD27-CD70 in patients with inflammatory bowel disease and in healthy controls. Methods A total of 62 patients with Crohn's disease, 64 patients with ulcerative colitis and 56 healthy controls were enrolled. Enzyme-linked immunosorbent assay was applied to evaluate plasma CD27-CD70 protein expression in patients with inflammatory bowel disease and healthy controls. SYBR-green real time PCR was applied to access CD27-CD70 mRNA expression in peripheral blood mononuclear cells in patients with inflammatory bowel disease and healthy controls.And CD27-CD70 protein expression in intestinal mucosa was determined by immunohitochemistry.Results Plasma levels of CD27 (P=0. 025) and CD70 (P=0. 000) were significantly higher in patients with Crohn's disease than in healthy controls. However, CD27 (r= 0. 055, P= 0. 673) and CD70 (r= 0. 024, P = 0. 852) were not significantly associated with endoscopic disease activity in patients with Crohn's disease. Similarly, CD27 (P=0. 001) and CD70 (P=0. 000) were significantly higher in patients with ulcerative colitis than in healthy controls. And CD27 (r=0. 077, P=0. 547)and CDT0 (r=0.021, P=0. 869) were not significantly associated with endoscopic disease activity in patients with ulcerative colitis. Moreover, CD27 and CD70 mRNA expression in peripheral blood mononuclear cells were significantly higher in patients with Crohn's disease and ulcerative colitis than in healthy controls (all P=0. 000), and immunostaining indicated that CD27 and CD70 expression in intestinal mucosa were significantly higher in patients with Crohn's disease and ulcerative colitis than in healthy controls (all P=0. 000). Conclusions CD27-CD70 pathway activated in plasma, peripheral blood mononuclear cells and intestinal mucosa of patients with inflammatory bowel disease. However,plasma levels of CD27 and CD70 can not reflect endoscopic disease activity.
RESUMEN
Objective To investigate the mechanism and effect of thalidomide on gastrointestinal bleeding of angiodysplasia. Methods The endothelial cells of human umbilical vein were cultured in vitro to exponential phase of growth, then were divided into blank control, solvent control and different concentrations (10- 100 μg/ml) of thalidomide incubated with or without basic fibroblast growth factor (bFGF). The cell proliferation was measured by MTT assay 72 h after stimulation. The expressions of vascular endothelial growth factor (VEGF) and tumor necrosis factor-α (TNF-α) were detected by ELISA and real-time PCR, respectively. Results The proliferation of endothelial cells of human umbilical vein was inhibited by thalidomide (≥40 μg/ml) both in presence or absence of bFGF. The expression of VEGF could be inhibited by 20 μg/ml of thalidomide in the absence of bFGF and 10 μg/ml in the presence of hFGF. No expression of TNF-α was detected. Conclusions The in vitro study reveals that thalidomide can inhibit the proliferation and the expression of VEGF, which may treat gastrointestinal bleeding of angiodysplasia by suppressing the angiogenesis.
RESUMEN
Objective To investigate the inhibitory effect of thalidomide on angiodysplasia.Methods Excisional intestinal specimens were collected and immunohistochemical examination was carried out.The human umbilical vein endothelial cells were cultured in vitro to exponential phase of growth,divided into six groups and synchronized for 24 hours.They were then stimulated with thalidomide (40-100 μg/ml) for 72 hours.MTT assay was used to assess cellular proliferation.ELISA,real-time quantitative PCB and western blot were applied to detect the expression of VEGF/HIF-1α of human umbilical vein endothelial cells (HUVEC).Results Immunohistochemical analysis of intestinal pathological specimens demonstrated higher expression of VEGF.ELISA showed that the expression of VEGF under hypoxia was obviously higher than that under normoxia [ ( 1199.3 ± 61.4) ng/L vs ( 864.7 ± 41.2 ) ng/L,P < 0.05 ].Real-time quantitative PCR and Western blot discovered that thalidomide inhibited the expression of VEGF/ HIF-1α of HUVEC (P < 0.05).The effect of thalidomide was dose-dependent.Conclusions Thalidomide can suppress the expression of HIF-1α and VEGF in HUVEC in vitro and then inhibit angiodysplasia,which may play a significant role in stopping the rebleeding in patients with recurrent gastrointestinal bleeding.
RESUMEN
Objective To observe and investigate the therapeutic effect of thalidomide on gastrointestinal bleeding of angiodysplasia.Methods Eighteen patients with recurrent gastrointestinal bleeding of angiodysplasia were treated with thalidomide 100 mg daily for 4 months.Median follow-up time was 16.7 months.The changes of clinical setting and serum.vascular endothelial growth factor(VEGF)and tumor necrosis faetor-α(TNF-α)level between pre-therapy and post-therapy were compared.Results The clinical setting of patients in post therapy was significantly better than that in pre-therapy.The overall symptom score,the median bleeding frequency and median transfusion volume of patients after therapy was significantly lower than those before the therapy[(15.000±3.630)vs(5.330±3.325),(11.220±6.404)vs(1.000±1.237),(1422.22±1556.601)ml vs(100.00±240.098)ml,respectively,all P＜0.01],while median hemoglobin was obviously higher than that before the therapy[(5.950±1.656)g/ml vs(9.533±2.278)g/ml,P＜0.01].Serum VEGF and TNF-α levels decreased obviously after the therapy(118 pg/ml vs 58 pg/ml,116 pg/ml vs 34 pg/ml,P＜0.01).Conclusions Thalidomide can suppress the serum VEGF and TNF-α levels of the patients with recurrent gastrointestinal bleeding of angiodysplasia,then play a significantly role in preventing the rebleeding in patients with recurrent gastrointestinal bleeding of angiodysplasia.
RESUMEN
Objective To compare the difference of protein and lipid metabolism between patients with inflammatory bowel disease and healthy controls,and to investigate the association of these changes with disease activity and location of the lessions.Methods The retrospective cohort study was carried out.The data of protein and lipid metabolisms collected from 195 patients with ulcerative colitis,76patients with Crohn's disease and 97 healthy controls during 1995 to 2007 were analyzed.Disease activity were evaluated using simple clinieal colitis activity index and simple index of Crohn's disease activity.The erythrocyte sedimentation rate(ESR)and C-reactive protein(CRP)were measured.Results Serum levels of ESR in patients with ulcerative colitis were negatively linear correlated with serum levels of albumin/globulin ratio(β=-0.521,P＜0.01)and positively linear correlated with serum levels of α2globulin(β=0.319,P＜0.01).Serum levels of globulin in patients with Crohn's disease were positively linear correlated with serum levels of ESR(β=0.558,P＜0.01)and CRP(β=0.424,P=0.01).In ulcerative colitis,serum levels of albumin/globulin ratio,albumin and total cholesterol were significantly higher in patients with proctosigmoiditis than those in patients with lesions at other locus(P=0.003,0.005,0.038,respectively).In Crohn's disease,serum level of globulin was significantly higher in patients with lesions only at colon than that in patients with lesions only at small bowel(P=0.029).Conclusions Serum levels of albumin/globulin ratio and α2-globulin can be predictors of inflammatory activity in patients with ulcerative colitis.The increasing serum globulin may predict the progression of disease activity in patients with Crohn's disease.The nutritional deficiency is more critical in patiens with small bowel involvement than those with colon involvement.
RESUMEN
Objective To explore the role of a novel regulatory molecule-microRNA in the hydroxycamptothecin-resistant human colon cancer cell line SW1116/HCPT in order to provide a new reversal target for muhidrug resistance.Methods MicroRNA expression profiling in the hydroxycamptothecin-resistant human colon cancer cell line SW1116/HCPT were detected by microRNA array using microRCURYTM LNA Array V8.1 to screen multi-drug resistance(MDR)-related microRNAs.Specific stem-loop primers were used for reverse-transcribing cDNA and the expression of some MDR-related microRNAs were analyzed by the real-time PCR.Results The absorbance ratios of total RNA used for total RNA preparation was further confirmed by denaturing agarose gel electrophoresis.Compared to SW1116,28 microRNAs were down-regulated and 36 microRNAs were up-regulated in SW1116/HCPT cell line.The expression of two down-regulated microRNAs(hsa-miR-452 and hsa-miR-373*)and one up-regulated microRNA(hsa-miR-506)were confirmed by real-time PCR.The results of hsa-miR-452 and hsa-miR-506 were consistent with microRNA array nalysis,however,the expression of hsa-miR-373* may play a key role in the process of hydroxycamptothecin-resistant human colon cancer cell line SW1116/HCPT.
RESUMEN
Objective To assess the agreement of different endoscopy grading or scoring systems for inflammatory bowel diseases(IBD)including ulcerative colitis(UC)and Crohn's disease(CD).Methods A standardized table was prepared based on the searches for endoscopic grading or scoring systems on Medline and Chinese Biomedical Database,the data of 80 patients with UC and 31 with CD.who underwent colonoscopy in Shanghai Renji hospital from June 2006 to February 2007,were evaluated with each system by two physicians independently.Data were analyzed with SPSS 13.0.Results Six endoscopic grading and scoring systems of UC and three of CD were included for evaluation.For the systems of UC and CD,Kendall's coefficients of concordance were 0.71(P<0.01)and 0.34(P<0.01),respectively.There was no significant differenee between every two systems for UC.Nonetheless.Spearman's correlation coefficient between Chinese Grading System of Crohn's Disease(CGSCD)and Crohn's Disease Endoscopic Index of Severity(CDEIS)was 0.32(P=0.08).Significant differences in frequencies were detected in endoscopic systems for UC by Kruskal Wallis test(P<0.01).Conclusion There is satisfactory concordance among the endoscopic grading and scoring systems of UC,while CGSCD needs further improvement.Furthermore,Jeroen elassifieation inclines to severe category,while modified Baron scale tends to be a mild one.
RESUMEN
Objective To evaluate the safety and effectiveness of capsule endoscopy(CE) in a large cohort of the elderly patients with obscure gastrointestinal bleeding(OGIB). Methods The demographic, clinical and diagnostic data of all geriatric patients with obscure gastrointestinal bleeding who underwent CE between May 2002 and February 2007 were retrospectively analyzed. For comparison, non-geriatric patients with obscure gastrointestinal bleeding who underwent CE during the same period were selected as the control group. Results Ninety-seven geriatric patients [40men/57 women, mean age (70.84-6.8) yrs]and ninety-nine non-geriatric patients [61 men/38women, mean age (44. 4±10. 3) yrs)were retrospectively reviewed. Eighty-nine patients presented with overt OGIB while eight patients had occult OGIB in the geriatric group. The section in the nongeriatric group was ninety-one and eight respectively. No significance was seen in the gastric transit time, completion rate and delay rate between two groups. The small bowel transit time was significantly longer in the geriatric group than that in the non-geriatric group (P<0. 05). Sixty-two patients in the geriatric group obtained positive diagnosis and angiodysplasia was the most frequent lesion;while sixty-seven patients in the non-geriatric group obtained positive diagnosis and Crohn's disease was the most frequent lesion. No significance was seen in the positive diagnostic rate between two groups (P>0. 05). However, the constituent ratio of the positive diagnosis was significantly different between two groups (P<0. 01). Conclusions CE is a safe and effective procedure for geriatric patients with obscure gastrointestinal bleeding. Angioectasia accounts for the majority of positive findings in geriatric group.
RESUMEN
Objective To investigate the clinical features of Crohn's disease(CD)and ulcerative colitis(UC)according to the Montreal classification.nethods The clinical data of 110 cases of CD or UC were reviewed.The age at diagnosis.location and clinical behavior were assessed with the Montreal criteria.Results CD patients diagnosed at an age younger than 16 years were rare(3.6%),the majority of the CD patients was diagnosed at 17-40 years old(65.5%).Although ileocolon lesions were most common in the patients diagnosed at 17-40 years old(37.3%),yet ileum lesions were a little more than those of other parts of digestive tract in the patients diagnosed after 40 years old(14.5%),the difference was not significant(P=0.054).Stricture frequently occurred(50.4%),especially when the lesions were located at ileum or ileocolon.Perforation rarely happened(5.3%).There was no significant difference between different location groups for clinical behaviors(P=0.096).The incidence of stricture or perforation was almost same among different age groups(P=0.984).UC patients mostly presented with mild or moderate symptoms even in the group with extensive lesion.UC patients with severe symptoms were rare(6.8%).There was no significant difference in severity between the groups with different extent of lesion (P=0.056).Conclusions The majority of CD patients was diagnosed at 17-40 years old.Stricture is much more than perforation,penetrating,occurring mostly at ileum.UC patients mostly present mild or moderate symptoms,no matter how extensive the lesion is.The extent of the lesion detected with coloscopic examination is not correlated to the severity of clinical manifestations.
RESUMEN
objective To analyse the incidence of technical breakdown and clinical problem leading to the failure of capsule endoscopy examination and their influence on the diagnosis and to evaluate its feasibility and safety in special patient population.Methods A retrospective study of 300 consecutive patients referred to Renji Hospital for evaluation of suspected small bowel diseases between May 2002 and May 2006 was done.This included 300 consecutive patients.The median age of the patients was 51y (range,3～91Y).The young children group was defined as less than 10 years and the elderly group as more than 80 years.Technical problems were those related to the functioning of the equipment and clinical problems were those related to the patient.The incidence and the type of above-mentioned events and their influence on the diagnosis were analyzed.The safety and feasibility of the capsule endoscopy procedure were evaluated in the young children group,elderly group and patients with pacemakers,gastrectomy and Billroth Ⅱ gastrojejunostomy,intestinal diverticula,Crohn's disease and polyp of small intestine.Results A total of 300 patients were involved.The incidence of technical problems was 1.3%.including one case of failing in activating the capsule,one case of failing in loading the data and two cases of short life of battery.Failure of diagnosis was encountered in two cases.The incidence of clinical problems was 33.0%(99 cases)and they caused 35.4%(35 cases)failure of diagnosis in the 99 cases.Three patients in the young children group were unable to swallow the capsule and endoscope-guided overtube technique was used with success in all.In the elderly group.the incidence of capsule retaining in the oesophagus and stomach was as high as 23.0%.In two patients with pacemaker no interference between pacemaker and capsule was detected.In two patients with Billroth Ⅱ gastrojejunostomy uo capsule retention occurred.In 16 patients with diverticulum,capsule retention occurred in 1 case(6.0%).In 42 patients with Crohn's disease,capsule retention occurred in 5 cases.No acute gastrointestinal obstruction was found in the 42 patients with Crohn's disease and in 5 patients with polyp of small intestine.Conclusions With capsule endoscopy technical mistakes causing failure were very rare.The majority of the clinical problems were related to the inability capsule to reach the colon during the recording time.Capsule endoscopy provides a well-tolerated,safe and effective tool to investigate the gastrointestinal diseases.especially some small bowel diseases.
RESUMEN
<p><b>OBJECTIVE</b>To investigate the therapeutic effect of retroviral endostatin gene transfer on the human colon cancer cell line, LoVo.</p><p><b>METHODS</b>A retroviral vector pLESSN expressing secretable endostatin was constructed and packaged with a titer of 8.2 x 10(5) CFU/ml. A LoVo cell line was subjected to retrovirus-mediated endostatin gene transfer. The proviral integration of endostatin was analyzed with PCR. The function of endostatin was tested by MTT assay in vitro and a mouse xenograft model in vivo.</p><p><b>RESULTS</b>After transfection and superinfection, amphotropic retrovirus was collected, and transduction with amphotropic retroviruses resulted in endostatin proviral integration. The endostatin secreted by transduced LoVo cells markedly inhibited cell growth up to 67% (P<0.001), compared with the control cells. The gene expression of endostatin in LoVo colon tumor cells significantly inhibited tumor growth in vivo. There was an 86% reduction in tumor size in the endostatin-transduced group, accompanied by a reduction in vessels, compared with the control group (P<0.01).</p><p><b>CONCLUSION</b>Retroviruses can allow functional expression of the endostatin gene in human colon tumors, showing promise for an antitumor strategy using antiangiogenesis.</p>
Asunto(s)
Humanos , División Celular , Línea Celular Tumoral , Neoplasias del Colon , Patología , Terapéutica , Endostatinas , Genética , Técnicas de Transferencia de Gen , Vectores Genéticos , RetroviridaeRESUMEN
<p><b>OBJECTIVE</b>To evaluate the roles of folic acid and beta-carotene in the chemoprevention of gastric and other gastrointestinal (GI) cancers.</p><p><b>METHODS</b>In a randomized, double-blind, placebo-controlled trial, a total of 216 patients with atrophic gastritis were randomly assigned to one of the four groups: (1) folate (FA, 20 mg per day plus vitamin B(12) 1 mg, intramuscularly, per month for one year, then 20 mg two times a week plus 1 mg per three months for the next year); (2) natural beta-carotene (N-betaC, 30 mg per day for first year, then 30 mg two times a week for the next); (3) synthetic beta-carotene (S-betaC, administered as in N-betaC); and (4) placebo. Follow-ups continued from 1994 to 2001.</p><p><b>RESULTS</b>A total of 7 new cases of gastrointestinal cancers were diagnosed with 3 stomach, 1 colon and 1 esophageal cancers occurring in the placebo group; 1 stomach cancer in both of the N-betaC and S-betaC groups, and no cancer occurring in FA group. In terms of GI cancers, there was a significant reduction in the FA group, compared with the placebo group (P = 0.04). A similar trend was observed in both N-betaC and S-betaC groups (P = 0.07 - 0.08). Taken together, the three intervention groups displayed a highly significant decrease in occurrence (P = 0.004, vs placebo), and a lower risk for GI cancers (OR = 0.12; 95% confidence interval, 0.03 - 0.51). For development of gastric cancer, any one of the three active-treated groups did not reach statistically significant reduction. The FA group showed obvious improvement of the gastric mucosal lesions with more patients displaying lesions reversed or stable atrophy and inflammation (P = 0.04), reversed intestinal metaplasia (P = 0.06) at the end of follow-up, and reversed displasia (P = 0.017) at 12 months. Two cases of false jaundice were found in beta-carotene groups with no influence on administration, and no side-effects were reported in FA group.</p><p><b>CONCLUSIONS</b>This trial revealed the interventional effect of folic acid on the development of GI cancers, a similar effect of beta-carotene was also detected. Also, folic acid may be of use to treat atrophic gastritis by preventing or reversing the precancerous lesions.</p>