Effect of IGF-1 on NO and PGE2 in rabbit articular chondrocytes induced by IL-1 / 中南大学学报(医学版)

OBJECTIVE@#To explore the effect of insulin-like growth factor (IGF-1) on the concentration of NO and PGE(2) in the supernatant of rabbit articular chondrocytes induced by IL-1, and to explore the mechanism of IGF-1 in the development of osteoarthritis (OA).@*METHODS@#The samples were divided into 7 groups: IL-1beta 10 microg/L group, IL-1beta 10 microg/L+IGF-1 1 microg/L group, IL-1beta 10 microg/L+IGF-1 10 microg/L group, IL-1beta 10 microg/L+IGF-1 50 microg/L group, IL-1beta 10 microg/L+IGF-1 100 microg/L group, IGF-1 50 microg/L group, and a blank control group. The chondrocytes from the articular cartilage of 2 month old rabbits were cultivated and identified, and then co-cultured in the second filial generation chondrocytes on plates with or without recombinant human IGF-1 or IL-1. The concentration of NO was detected by nitrate reductase kit, and that of PGE(2) by enzyme-linked immunosorbent assay (ELISA). The results were analyzed by statistical method.@*RESULTS@#The average value of NO and PGE(2) was (89.971+/-10.224) micromol/L and (22.028+/-8.731) micromol/L in the IL-1beta 10 microg/L group, and (12.404+/-8.809) micromol/L and (1.900+/-0.227) ng/L in the blank control group. The concentration of NO and PGE(2) in IL-1beta 10 microg/L group was significantly higher than that in the blank control group (P<0.05). At the same concentration of 10 microg/L, IGF-1 could dose-dependently decrease the increase of NO and PGE(2) concentration induced by IL-1beta in the chondrocytes supernatant in vitro, and the optimum concentration of IGF-1 was 50 microg/L.@*CONCLUSION@#IL-1 can significantly increase the concentration of NO and PGE(2), and IGF-1 can dose-dependently decrease the concentration of NO and PGE(2) in the chondrocytes supernatant in vitro. The optimum concentration of IGF-1 was 50 microg/L.

Culture of chondrocytes using nano-hydroxyapatite/collagen in vitro / 中南大学学报(医学版)

OBJECTIVE@#To evaluate the value of the nano-hydroxyapatite/ collagen (nHAC) as a scaffold for cartilage tissue engineering.@*METHODS@#The normal cartilage from patients after total hip arthroplasty of osteoarthritis was selected, and then chondrocytes were digested, separated, and amplificate in vitro. The chondrocytes were seeded onto the nHAC scaffold and were cultured in a 3-dimensional environment for 5 and 10 days. The effects of the composite scaffold on the cell adhesion, proliferation, morphological changes, and synthesis of the extracellular matrix were observed by scanning electronic microscopy and immunohistochemistry.@*RESULTS@#The chondrocytes could adhere to the surface of the scaffolds, proliferate, and migrate into the scaffolds. They maintained round and could secrete extracellular matrix on the porous scaffold.@*CONCLUSION@#The nHAC can be used as the cartilage cell carrier.

Herceptin plus adjuvant chemotherapy for the prognosis of patients with human epithelial growth factor receptor 2 positive early-stage breast cancer: a meta-analysis / 中南大学学报(医学版)

OBJECTIVE@#To evaluate the effect of herceptin(trastuzumab) plus adjuvant chemotherapy on the prognosis of patients with human epithelial growth factor receptor 2 (HER2) positive early-stage breast cancer by Meta-analysis.@*METHODS@#Search all of randomized clinical trials (RCTs) on herceptin plus adjuvant chemotherapy for HER2 positive early-stage breast cancer in MEDLINE, EMBase, Cochrane library, Clinical Trails, ASCO Conference data, CHKD, Wanfang Database, VIP information, scholar.google.com and SIGLE. A Meta-analysis was carried out by collecting information based on the inclusion and exclusion criteria from all papers available.@*RESULTS@#The Meta-analysis included 4 trials. A total of 9116 patients were included in the analysis(4555 in the study group and 4561 in the control group). There were statistical differences between the study group(herceptin plus adjuvant chemotherapy) and the control group(adjuvant chemotherapy) in the disease-free survival rate [relative risk(RR)=1.08, 95% CI, 1.06-1.09, P<0.001], the overall survival rate(RR=1.01, 95% CI, 1.01-1.02, P=0.0003), the distant recurrence rate(RR=0.49, 95% CI, 0.42-0.57, P<0.001), and the cardiac events rate (RR=3.93,95% CI, 1.03-15.06, P=0.05).@*CONCLUSION@#Herceptin plus adjuvant chemotherapy can improve the disease-free survival rate and the overall survival rate, decrease distant recurrence rate of patients with HER2 positive early-stage breast cancer, but may cause heart toxicity, especially when combined with anthracycline (doxorubicin).