Protective effect and mechanism of serum containing Euonymus fortunei on rat pancreatic islet cells / 器官移植

Objective To investigate the protective effect and mechanism of serum containing Euonymus fortunei on the rat pancreatic islet cells. Methods Forty male SD rats were randomly divided into 5 groups (n=8 in each group), including the control group (normal rat islet cells were cultured with normal rat serum), ischemic preconditioning group (abdominal aorta was blocked first and then re-opened before the pancreas was obtained, and the pancreatic islet cells were cultured with normal rat serum), Euonymus fortunei treatment group (normal rat islet cells were cultured with rat serum containing Euonymus fortunei), Euonymus fortunei group and blank group (normal rats were administered orally with Euonymus fortunei extract or distilled water for the preparation of rat serum). Diphenylthiocarbazone (DTZ) staining was utilized to observe and calculate the quantity of islets. Acridine orange (AO)/propidium iodide (PI) staining was adopted to calculate the survival rate of islet cells. The insulin release experiment was performed to calculate the stimulation index (SI) and evaluate islet cell function. The concentration of glutathione (GSH) and nitric oxide (NO) in islet cells was detected using GSH and NO kits. The expression level of inducible nitric oxide synthase (iNOS) messenger RNA (mRNA) was quantitatively measured by reverse transcription polymerase chain reaction (RT-PCR). Results Islet cells were observed in specifically scarlet color after DTZ staining. The quantity of islet cells did not significantly differ among different groups (all P>0.05). Along with the prolongation of culture time, the activity of islet cells in each group was gradually decreased. At 72 h after isolation and culture, compared with the control group, the survival rate of the cells was significantly higher in the Euonymus fortunei treatment group (P<0.05). The insulin release test results demonstrated that compared with the control group, the SI of the ischemic preconditioning and Euonymus fortunei treatment groups was significantly increased (both P<0.05). Compared with the control group, the GSH contents of pancreatic islet cells in the ischemic preconditioning and Euonymus fortunei treatment groups were considerably enhanced, the NO content was significantly decreased, and the expression level of iNOS mRNA was significantly down-regulated (all P<0.05). Conclusions Euonymus fortunei can increase the survival rate of islet cells and enhance the function of pancreatic islets by increasing the level of GSH, down-regulating the expression of iNOS and decreasing the NO production.

Imaging Finding of Multiple Endocrine Neoplasia Type 1: Case Report

Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant inherited syndrome with characteristic clinical and radiological manifestations. Many reports on MEN1 have been published; however, no cases of radiologically diagnosed MEN1 have been reported. Therefore, we report on a radiologically diagnosed case of MEN1 with clinical symptoms of gastroduodenal ulcer.

Tracking transplanted pancreatic islet cells in rats using magnetic resonance imaging / 复旦学报（医学版）

Objective To track superparamagnetic iron oxide (SPIO)-labeled pancreatic islet cells in rats using 3.0T magnetic resonance imaging (MRI), and to detect the survival and rejection of grafts after transplantation. Methods Twenty male Wistar rats and 5 male Lewis rats were included in the study. SPIO-labeled pancreatic islet cells were tracked using a GE 3.0T Signa Excite MRI scanner with an animal coil. The images of SPIO-labeled islet cells in rats after transplantation were compared with those of the unlabeled ones. FSE T2WI sequence and GRE T2*WI sequence were used for the detection. The sensitivity of images for detection of grafts was also compared. SPIO-labeled pancreatic islet cells isolated from Wistar and Lewis rats were transplanted into the liver of Wistar rats. Afterwards, the survival and rejection of islet cells were observed sequentially in these two growps. The rats in the syngeneic group were sacrificed 3 months post-transplantation, while the rats in the allogeneic group were sacrificed 3 weeks post-transplantation. MRI of the grafts were correlated with the pathological results. Results SPIO-labeled pancreatic islet cells were seen on MRI as distinct homogenous, hypointense spots in the liver. GRE T2*WI were more sensitive to the detection of SPIO-labeled islet cells than FSE T2WI. The relative count of hypointense spots in the syngeneic group were (90.03±9.52)%, (92.87±18.21)% and (86.25±24.81)%, respectively at 1 week, 2 weeks and 3 weeks after transplantation, while the relative count in the allogeneic group were (41.40±15.41)%, (33.41±14.01)% and (23.58±16.78)%, respectively. The difference between these counts was statistically significant (P<0.01). Iron particles were detected only in the SPIO-labeled cells. Three months post-transplantation, the grafts were found well-preserved in the liver of the rats of the syngeneic group, while only a few grafts were found in that of the allogeneic group. Conclusions MRI can be used to track SPIO-labeled islet cells in vivo, and has significant value in detecting the survival and rejection of grafts after transplantation in rats.

Transplante de ilhotas pancreáticas em dispositivos de imunoisolamento celular: resultados iniciais

There have been great developments in pancreas and pancreatic islet cell transplantion in the last few years. The isolation of the islet cells in capsules with semi-permeable membranes may become ideal means of treating diabetes, and the use of immunossuppression could be avoided. The ideal material for the confection of the capsules has remained a dream. A new material derived from natural latex was implanted in the subcutaneous tissue of normal and diabetic rats to study the biocompatibility and the vascular neoformation. After 21 days, an analysis of the implant showed intense vascular neoformation on the membrane-tissue interface and little fibrotic tissue. The inicial results show great promise for utilization of this material in capsules for the isolation of cells.

O transplante de pâncreas e de ilhotas pancreáticas vem apresentando grande desenvolvimento nos últimos anos. O isolamento das ilhotas em cápsulas com membrana semi-permeáveis pode ser tratamento de escolha para o diabetes, pois dispensa o uso de imunossupressores. O material ideal para a confecção de uma cápsula para o isolamento celular ainda permanece um sonho. Um novo material a base de látex natural foi implantado no subcutâneo de ratos normais e diabéticos para estudar a biocompatibilidade e a neoformação vascular. A análise após 21 dias de implante mostrou intensa formação capilar na interface membrana-tecido e pouco tecido fibrótico. Estes achados iniciais mostram que o material pode ter algum potencial para a confecção de dispositivos de isolamento celular.

Pheochromocytoma with pancreatic islet cell tumor: a case report / 한국간담췌외과학회지

A 17-years old woman with a combination of unilateral pheochromocytoma and an asymptomatic islet cell tumor of the pancreas is presented. The unusual coincidence of pheochromocytoma and pancreatic islet cell tumor in the patient is of interest as a possible crossover between MEN I and MEN II. It has been suggested that MEN I represents an abnormality of the APUD(amine precursor uptake and decarboxylation) cells of ectodermal origin. However, the possibility of a common progenitor cell in the neural crest for all APUD cells has been suggested by Pearse and Polak(1971). Recent clinical reports suggest that overlap between the two syndroms may occur. The overlapping of elements of the classical endocrine neoplasia should alert clinicians to the possibility of such associations in any particular patients. Since islet cell tumors may occur in association with pheochromocytomas and may be clinically silent, exploration of the pancreas during surgery for pheochromocytomas would seem to be useful.

Pancreatic islet-cell adenoma

Pancreatic islet cell adenoma is a benign tumor of pancreatic beta-cell and a rare cause of hyperinsulinemic hypoglycemia in children. The authors experienced a case of pancreatic islet cell adenoma(Insulinoma)in a 11 year and 8 month old male who had frequent loss of consciousness and seizure. Enucleation was done after localization of tumor by selective celiac artery angiography and abdominal computed tomography. Diagnosis was confirmed by histologic findings as pancreatic-adenoma, gyriform growth pattern. A brief review of related literature was made.

EFFECT OF TEA POLYSACCHARIDE ON GLUCOSE METABOLISM,HISTOMORPHOLOGY AND PANCREATIC ISLET BETA-CELL ULTRASTRUCTURE IN DIABETIC MICE / 营养学报

Objective To study tea polysaccharides(TP) on glucose metabolism,histopathology,and pancreatic islet ?-cell ultrastructure in diabetic mice.Method The alloxan diabetic mice were randomly divided into 4 groups,and orally given distilled water,TP 0.25,0.50,1.00 g/(kg bw?d).for 5 w,and weighed once every week.In experiment 2 and 4 w,the fasting blood glucose was tested once.The glucose tolerance test was conducted at the end of experiments.Blood serum insulin and liver glycogen were measured.The protein content,hexokinase(HK) and pyruvate kinase(PK) activity of 10% liver homogenate were measured.The histopathology of liver,pancreas,kidney and spleen tissue and the ultra structure of pancreas were observed.Results TP could significantly alleviate the symptoms of diabetic mice.The fasting blood glucose values in three TP groups were significantly decreased(P