Purification, induced differentiation and identification of rat embryonic neural stem cells / 生物医学工程学杂志

The methods of purification, expanding, marking, conservation, induced differentiation and identification of neural stem cells (NSCs) in vitro were explored for further research and treatment of tethered cord syndrome in children and other neural system diseases. The cells derived from the cerebral cortex of frontal lobe in 14.5 d rat embryos were maintained in serum-free DMEM/F12 medium containing 20 ng/ml bFGF, 20 ng/ml EGF and B27 supplement. The NSCs of suspending single-cell-colon were isolated and passaged, were purified by limited dilution, and were expanded numerously with sub-colon in consecutive generations. Then, Nestin antigen expression was detected by immunohistochemistry techniques. The cells of the purified and expanded NSCs were frozen, recovered and incubated in BrdU, and the NSCs were induced to differentiate in serum or feeder layer. These revived NSCs from frozen cells could express Nestin antigen and could be induced in serum or feeder layer to differentiate into neurons and glias expressing tubulin-III and GFAP respectively. It is good and simple for purification and proliferation of NSCs numerously by the limited dilution and consecutive generations suspending single-cell-colon of NSCs from the cerebral cortex of frontal lobe in rat embryos. The NSCs could be induced on feeder layer to differentiate into neural cells numerously. BrdU can mark and trace NSCs for the research and treatment of the animal model of neural system diseases. By good command of the technlogies for the purification proliferation, and induced differentiation of NSCs in vitro, it is possible to find a new way for further research of the biologic specificity and the treatment of the disease in nervous system.

The morphological and histochemical properties of costal cartilage matrix in children with pectus excavatum / 中华胸心血管外科杂志

Objective: To evaluate the omrphological and histochemical properties of cartilage matrix of children with pectus excavatum(PE). Methods: The collagen of cartialge matrix of 19 PE and of 14 age-matched children was examined by transmission electron microscopy(TEM) and immunohistochemical staining examination. Meanwhile, the proteoglycan was studied by PAS and Safranin-O staining examination. All of the results of stanining were also analysed by the GT-2 model of image analysis software. Results: Compared with control group, although the intensity of type II collagen was intact, unequally distribution of collagen had been found by the TEM and immunohistochemical staining examination. The intensity and distribution of proteoglycan of PE group remained normal found by the PAS and Safranin-O staining examination. Conclusion: Although the intensity and distribution of proteoglycan was intact, as well as intensity of collagen, the distribution of collagen in PE was abnormal, and this change may possibly be related to the defectiveness of costal cartialge of PE.

Therapeutic effect of different types of biliary tract reconstruction after resection of congenital choledochal cyst / 中国普通外科杂志

Objective To evaluate the therapeutic effect of different types of biliary tract reconstruction on the post- resection of congenital choledochal cyst (CCC). Methods 106 cases of CCC undergoing resection of CCC with Roux-en-Y hepaticojejunostomy as biliary tract reconstruction were followed up and analysed. Results In this series, three kinds of biliary tract reconstruction were performed, including single Roux-en-Y hepaticojejunostomy in 48 cases, intussusceptive valve and rectangular valve lying on the jejunal segmental of Roux-en-Y hepaticojejunostomy in 37 and 21 cases, respectively. 61 cases were followed up for 4.82 years in average. None of them occurred anastomasis stricture. There were 4 cases with ascending cholangitis after primary operation: of them 3 after single Roux-en-Y hepaticojejunostomy; symptoms of 2 out of the 3 cases disappeared after reoperation to set up an intussusceptive valve plasty on the jejunal segmental of Roux-en-Y hepaticojejunostomy; another one was in rectangular valve group. Occasional abdominal pain tooke place in 8 patients, of them, 5 in single Roux-en-Y hepaticojejunostomy group, 2 and 1 in intussusceptive valve and rectangular valve groups, respectively. No patients suffered from ascending cholangitis in the intussusceptive valve plasty group. Conclusions The postoperative ascending cholangitis and anastomasis stricture can be prevented effectively, if a prophylactic intussusceptive valve on the jejunal segmental of Roux-en-Y hepaticojejunostomy is carried out after resection of CCC for biliary tract reconstruction. This procedure corresponds to the biliary tract physiology.