The proliferation and differentiation of pancreatic duct epithelial cells in remnant pancreas during regeneration after partial pancreatectomy in rats were studied, and the source of pancreatic stem cells was characterized. Partial (90 %) pancreatectomy was performed on 4- to 5-week-old Sprague-Dawley rats, and different duct epithelial cells and acinar cells were detected by immunohistrochemical stain method and scored using 5-bromo-2'-deoxyuridine (BrdU) labeling index (LI) at various time points after partial pancreatectomy. It was found that at 24 h after partial pancreatectomy proliferation started in the main, large and small duct cells, and persisted in small duct cells to day 5. There was significant difference between the experimental group and the control group (P<0.001). Acinar cells positive for BrdU were greatly increased and reached the peak LI on day 5. The destroyed lobular architecture almost totally recovered on day 7, and the newly islet cells appeared around the pancreatic ducts. These results suggest that regeneration after partial pancreatectomy is involved in proliferation and differentiation of pancreatic stem cells, and pancreatic stem cells may locate in the pancreatic ductules.

Objective: To investigate the effect of hydrogen sulifde (H2S) on the expression of CSE, NF-κB, and IL-8 mRNA in GES-1 cells withHelicobacter pylori (H. pylori) infection and to explore its mechanism on gastric mucosa inlfammation caused byH. pylori.
Methods: GES-1 cells were cultured for 24 h and divided into a control group (neitherH. pylori nor NaHS), anH. pylori group, a NaHS group (which was further divided into 4 groups at 50, 100, 200, or 400 μmol/L NaHS), andH. pylori + NaHS group (which was further divided into 4 groups at 50, 100, 200, or 400 μmol/L NaHS). Each group was then cultured for 3, 6, or 12 h. The expression of CSE, NF-κB, and IL-8 mRNA was measured by RT-PCR, and their correlation was analyzed. Results: The expression of CSE, NF-κB, and IL-8 mRNA in GES-1 cells in theH. pylori group was higher than that in the control group. The expression of CSE in the 200 μmol/L NaHS group and 400 μmol/L NaHS group was lower than that of the control group (P<0.05), whereas the expression of NF-κB and IL-8 in all NaHS groups had no statistical differences compared with the control group (P>0.05). The expression of CSE, NF-κB, and IL-8 mRNA in all groups of NaHS,H. pylori + 200 μmol/L NaHS group, andH. pylori + 400 μmol/L NaHS group was lower than that in theH. pylori group (P<0.05). There was positive correlation among the expressions of CSE, NF-κB, and IL-8 mRNA in theH. pylori group, theH. pylori + 200 μmol/L NaHS group, and theH. pylori +400 μmol/L NaHS group (P<0.05).
Conclusion:H. pylori can induce NF-κB and IL-8 mRNA expression and upregulate CSE mRNA expression. At 200 and 400 μmol/L, NaHS can suppressH. pylori-induced NF-κB and IL-8 mRNA expression and ameliorate the morphology ofH. pylori-induced GES-1 injury, which may protect gastric epithelial cells byH. pylori infection.

In this study,the rDNA ITS sequence of isolate of Lactarius deliciosus(L.)Gray was sequenced.Molecular identification was accomplished using phylogenetic tree analysis of 22 Lactarius nrDNA-ITS nucleotide sequence including the 2 new and 20 GenBank sequence.

Objective To study and evaluate the diagnostic and differencial diagnostic value of detection of human telomerase reverse transcriptase(hTERT) mRNA and telomerase activity in pancreatic juice of (pancreatic) cancer(PC) .Methods hTERT mRNA expression and telomerase activity in pancreatic juice in 24 cases of (pancreatic) cancer and 14 cases of chronic pancreatitis(CP) were detected and compared.Results Expression of hTERT mRNA was detected in 87 .5% (21/24) of PC cases and 21.4%(3/14) of CP cases(P

To investigate the protein and mRNA expression of pancreas/duodenal homeobox-1 (PDX-1), a transcription factor as a marker for pancreatic stem cells, in pancreatic ductal cells of rats after partial (90%) pancreatectomy and evaluated the significance of the PDX-1 expression. Western blot and Reverse transcriptase-polymerase chain reaction (RT-PCR) were used to detect the expression of PDX-1 protein and mRNA respectively. PDX-1 protein was only faintly detected in pancreatic ductal cells on the day 1 after partial pancreatectomy. On the day 2 and 3 after operation in operation group, a 2-3 fold increased PDX-1 protein was observed, corresponding to the characteristic 42-kD protein in Western blot. There was significant difference between operation group and sham-operation group (P<0.05). PDX-1 protein expression on the day 5 and 7 after operation had already been no difference from control group (P>0.05). RT-PCR revealed the PDX-1 mRNA expression showed no significant difference between operation group at various time points and sham-operation group (P> 0.05). These results indicate that there was overexpression of PDX-1 in the cells of pancreatic epithelium during the regeneration of remnant pancreas after partial pancreatectomy in adult rats, suggesting the pancreatic stem cells in pancreatic ductal epithelial cells are involved in the regeneration of remnant pancreas and the expression of PDX-1 in ductal cells was regulated posttranscription.
Epithelial Cells/metabolism ; Homeodomain Proteins/*biosynthesis ; Homeodomain Proteins/genetics ; Pancreatectomy/methods ; Pancreatic Ducts/cytology ; Pancreatic Ducts/*metabolism ; RNA, Messenger/biosynthesis ; RNA, Messenger/genetics ; Rats, Sprague-Dawley ; Trans-Activators/*biosynthesis ; Trans-Activators/genetics

To explore the plasticity of human amniotic mesenchymal cells(hAMCs) into cardiomyocyte-like cells,hAMCs were isolated from human amnion with collagenase digestion.Phenotype of the isolated cells was analyzed by flow cytometry(FCM).hAMCs were treated with 5-azacytidine and basic fibroblast growth factor(bFGF) to investigate their ability of differentiation into cardiomyocytes.The induced differentiated cells were evaluated by immunofluorescence for desmin and ?-actin expression and by RT-PCR for Nkx2.5,GATA-4 and alpha-myosin heavy chain(?-MHC) mRNA expression.The results showed that,after primary culture,hAMCs could reach a confluence of 80% with swirl like growth at 6 days.The cells proliferated rapidly after passages with a 100% confluence at 3~4 d.hAMCs were positive expression of CD44 and vimentin,but negative for CK19.After induced differentiation at 8~10d,the differentiated cells have close-up arranged with long spindle-shape.At 2 weeks and 4 weeks,induced cells expressed ?-actinin and cardiac-specific transcription factor Nkx2.5.Expressions of GATA-4 and desmin can be detected but ?-MHC can not in the hAMCs both before and after the induction.In conclusion,hAMCs have the ability of differentiation into cardiomyocyte-like cells,which means that hAMCs can be regarded as candidate cells for cellular cardiomyoplasty(CCM).

Objective To study the change and rule of immunological function among the patients with coal arsenic poisoning in order to provide a basis for tumor risk evaluation and monitoring.Methods Seventy patients with coal arsenic poisoning aged from 24 to 71 years old(44 men,26 women,averaging 41 years old)were divided into 4 groups including 23 cases having a course less than 10 years,21 case8 lasting for 10～19 years,20 cages for more than 20 years,6 cases of cancer,and 26 healthy normal controls.Flow cytometer(FCM)was used to analyze the frequency of CD3+(total T cell),CD3+CD4+(inducer/helper T cell),CD3+CD8+(suppressor/cytotoxic T cell),CD19+(B lymphocyte),and CD56+CD16+(natural killer cell)lymphocyte subsets in the peripheral blood of the subjects and the expression rates of lymphocytic membrane surface molecules of human leucocvte antigen (HLA)-DR,CD25,CD38 were also determined by FCM.Results The pmportions of CD3+cells in periDheral blood of less than 10 years,10～19 years,more than 20 years and cancer groups were (63.76±9.32)%。(55.63± 12.97)%,(51.00±12.23)%and(49.83±,9.89)%respectively,which were significantly lower than that in control group[(68.10±8.62)%],and there was a significant difference between different groups(F=12.862,P<0.05). In less than 10 years,10～19 years,more than 20 years and cancer groups,the proportion of CD3+CD4+cells cells was (31.35±6.62)%,(28.38±8,66)%,(24.13±6.46)%and(19.17±4.96)%respectively,which wag significantly lowerthan that in control group[(34.28±7.32)%],and significant in a-group difference was found(F=10.455, P<0.05).The percentages of CD19+cells in more than 20 yeats and cancer groups[(9.00±5.32)%,(9.00± 3.29)%]were lower than that in control group and less than 10 years group[(11.80±3.43)%,(12.35±4.53)%] (P<0.05),while no statistical difference was found between other groups.The expression rates of CD25 and CD38 in lymphocytes of cancer group[(17.96 ±4.98)%,(41.38±8.54)%]were obviously higher than those in control group[(13.10±338)%,(28.60±5.51)%]and there were statistical differences between the experimental groups(P<0.05).The expression rate of HLA-DR in 10～19 years groups[(18.20±6.25)%]was significantly higher than that in control group[(10.72±7.06)%]and less than 10 years group[(11.78±5.13)%],while it was the same in more than 20 years and cancer group[(20.30±8.01)%,(21.82±10.97)%].Conclusions Reduction of cellular immune function caused by coal arsenic poisoning may be an important mechanism of skin cancer.CelMar immune function may be used as a warning signal of skin cancerization of patients with coal arsenic poisoning.

To investigate the protein and mRNA expression of pancreas/duodenal homeobox-1 (PDX-1), a transcription factor as a marker for pancreatic stem cells, in pancreatic ductal cells of rats after partial (90%) pancreatectomy and evaluated the significance of the PDX-1 expression. Western blot and Reverse transcriptase-polymerase chain reaction (RT-PCR) were used to detect the expression of PDX-1 protein and mRNA respectively. PDX-1 protein was only faintly detected in pancreatic ductal cells on the day 1 after partial pancreatectomy. On the day 2 and 3 after operation in operation group, a 2-3 fold increased PDX-1 protein was observed, corresponding to the characteristic 42-kD protein in Western blot. There was significant difference between operation group and sham-operation group (P<0.05). PDX-1 protein expression on the day 5 and 7 after operation had already been no difference from control group (P>0.05). RT-PCR revealed the PDX-1 mRNA expression showed no significant difference between operation group at various time points and sham-operation group (P> 0.05). These results indicate that there was overexpression of PDX-1 in the cells of pancreatic epithelium during the regeneration of remnant pancreas after partial pancreatectomy in adult rats, suggesting the pancreatic stem cells in pancreatic ductal epithelial cells are involved in the regeneration of remnant pancreas and the expression of PDX-1 in ductal cells was regulated posttranscription.
Animals ; Epithelial Cells ; metabolism ; Homeodomain Proteins ; biosynthesis ; genetics ; Pancreatectomy ; methods ; Pancreatic Ducts ; cytology ; metabolism ; RNA, Messenger ; biosynthesis ; genetics ; Rats ; Rats, Sprague-Dawley ; Trans-Activators ; biosynthesis ; genetics

The effects of early hemofiltration on the serum levels of cytokines, pro- and anti-inflammatory balance and organ function in pigs with severe acute pancreatits (SAP) were studied. SAP pig model was induced by retrograde injection of artificial bile into the pancreatic duct. The pigs were randomly divided into SAP hemofiltration treatment group (HF group, n=8) and SAP non-hemofiltration treatment group (NHF group, n=8). In the HF group, the animals were subjected to high-volume and zero-balance hemofiltration therapy. The results showed that as compared with NHF group, MAP, CVP and PaO2/FiO2 were significantly increased (P<0.01), while HR, urinary protein content, serum ALT level, pulmonary coefficient and lung wet/dry ratio obviously decreased (P<0.05) in HF group. Under a light microscope, the pulmonary histologic scoring was lower that in HF group (P<0.01) and the lesions of renal and liver tissues were milder. However, there was no significant difference in the pancreatic histologic scoring between the two groups. Six h after establishment of the model, the serum levels of TNF-alpha, IL-1beta were lower, while the IL-10/ TNF-alpha ratio was higher in HF group (all P<0.05). It was suggested that early hemofiltration could effectively remove the serum cytokines TNF-alpha and IL-1beta in SAP pigs, elevate the ratio of IL-10/TNF-alpha, improve hemodynamics and alleviate the lesions of lung, kidney and liver tissues.
Animals ; Female ; Hemofiltration ; Interleukin-1 ; blood ; Interleukin-10 ; blood ; Male ; Multiple Organ Failure ; etiology ; prevention & control ; Pancreatitis, Acute Necrotizing ; complications ; therapy ; Random Allocation ; Swine ; Time Factors ; Tumor Necrosis Factor-alpha ; metabolism

Objective:To explore the feasibility and clinical efficacy of gelatin sponge packing in reducing bone cement leakage in percutaneous kyphoplasty (PKP).Methods:A retrospective case-control study was conducted in data of 171 patients (171 vertebrae) with monosegmental lumbar osteoporosis compressive fracture treated by PKP from January 2015 to December 2018 in Sichuan Orthopedic Hospital. There were 66 males and 105 females, with the age of (67.9±6.7)years (range, 60-87 years). There were 22 patients with T 10 fracture, 28 with T 11 fracture, 37 with T 12 fracture, 34 with L 1 fracture, 32 with L 2 fracture and 18 with L 3 fracture. A total of 80 patients were pre-filled with gelatin sponge before injection (Group A), and 91 patients were not filled with gelatin sponge before injection (Group B). The operation time, amount of bone cement, and rate of bone cement leakage were recorded. The change of anterior vertebral height, Cobb angle, visual simulation score (VAS) and Oswestry disability index (ODI) were compared before operation and at postoperative 1 day, 3 months, 6 months, 12 months. Results:All patients were followed up for 1-12 months [(12.8±0.6)months]. The operation time in Group A and B was (48.3±1.2)minutes and (42.3±1.3)minutes ( P<0.05). The amount of bone cement in Group A and B was (5.4±0.8)ml and (5.6±0.7)ml ( P>0.05). The incidence of bone cement leakage in Group A and B was 11% (9/80) and 26% (24/91) ( P<0.05). There was no significant difference between the two groups in the anterior height of injured vertebrae, change of Cobb angle, VAS and ODI before and after operation ( P>0.05). Conclusion:Gelatin sponge can reduce the rate of bone cement leakage in PKP for the treatment of thoracolumbar osteoporosis compressive fracture, and has similar effect with PKP in correcting kyphosis, alleviating pain and improving life quality.