link1: Zhonghua Nan Ke Xue. 2008 Feb;14(2):116-21.Links
[Curcumin inhibits the expression of vascular endothelial growth factor and androgen-independent prostate cancer cell line PC-3 in vitro][Article in Chinese]
Deng G, Yu JH, Ye ZQ, Hu ZQ.
Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan , Hubei 430030, China. firstname.lastname@example.org
OBJECTIVE: To study the effects of curcumin on the expression of the vascular endothelial growth factor (VEGF) and androgen-independent prostate cancer cell line PC-3, and to explore its anticarcinogenic mechanism. METHODS: PC-3 cells were treated with curcumin at the concentration of 0, 6.25, 12.5, 25 and 50 micromol/L respectively. Then the cell activity was assayed by dyed rate of Typan blue and MTT at 12, 24, 36, 48, 72 and 96 hours, the cell cycle and morphological changes observed by flow cytometry (FCM) and electronic microscopy at 24 hours, the VEGF mRNA expression measured by semi-quantitative RT-PCR, and the secreting protein levels of VEGF in the supernatants determined by enzyme-linked immunosorbent assay (ELISA). RESULTS: The growth of PC-3 cells was suppressed obviously by curcumin in a dose- and time-dependent manner in vitro. There were significant differences in inhibition rate among different concentration and time groups (P < 0.01). Furthermore, curcumin arrested the cell cycle of PC-3 cells in the G2/M phase in a dose-dependent manner (P < 0.01). The percentages of apoptotic cells were significantly higher in different concentration groups than in the controls (P < 0.01). Apoptosis-associated morphological changes were observed in PC-3 cells at 24 hours, and a marked decline in the expression of VEGF was noted after the exposure to different concentrations of curcumin within 24 hours. CONCLUSION: Curcumin can suppress the growth of PC-3 cells, promote their apoptosis and arrest their cell cycle in the G2/M phase, and reduce the expression of VEGF mRNA and proteins, which may sever to explain its inhibitory effect on tumor and angiogenesis.
PMID: 18390174 [PubMed - indexed for MEDLINE]
1: Curr Neurovasc Res. 2008 Feb;5(1):71-81. Links
Blood brain barrier in hypoxic-ischemic conditions.Kaur C, Ling EA.
Department of Anatomy, Yong Loo Lin School of Medicine, Blk MD10, 4 Medical Drive, National University of Singapore, Singapore 117597. email@example.com.
The blood brain barrier (BBB) plays an important role in the homeostatic regulation of the brain microenvironment and maintains the immune-privileged status of the brain by restricting the entry of T lymphocytes. Structurally, the BBB is formed by tight junctions between the endothelial cells. Astrocytes, pericytes and perivascular microglia surround the endothelial cells contributing to proper functioning of the BBB. Hypoxia, associated with disorders such as stroke, cardiac arrest, respiratory distress, carbon monoxide poisoning among many others, disrupts the BBB. Alterations in the endothelial cells such as increased pinocytotic vesicles and derangement of the tight junction proteins may be responsible for increased permeability at the BBB resulting in swelling of astrocyte end feet. The disruption of BBB in hypoxic conditions is multifactorial and may involve factors such as enhanced production of vascular endothelial growth factor (VEGF), nitric oxide (NO) and inflammatory cytokines. Although future research is needed to look into possible therapeutic strategies to improve the functioning of BBB in hypoxic conditions, experimental studies so far have reported beneficial effect of curcumin, melatonin, simvastatin and minocycline in ameliorating the increased BBB permeability in hypoxic conditions.
PMID: 18289024 [PubMed - in process]
Related ArticlesReviewIn search of the astrocytic factor(s) modulating blood-brain barrier functions in brain capillary endothelial cells in vitro. [Cell Mol Neurobiol. 2005] Blood-retinal barrier in hypoxic ischaemic conditions: Basic concepts, clinical features and management. [Prog Retin Eye Res. 2008] Protein expression of brain endothelial cell E-cadherin after hypoxia/aglycemia: influence of astrocyte contact. [Brain Res. 1999] SSeCKS regulates angiogenesis and tight junction formation in blood-brain barrier. [Nat Med. 2003] ReviewAstrocyte-endothelial interactions and blood-brain barrier permeability. [J Anat. 2002] » See Reviews... | » See All...
1: Ai Zheng. 2005 Dec;24(12):1459-63. Links
[Inhibitory effects of Scutellaria barbatae D. Don on tumor angiogenesis and its mechanism][Article in Chinese]
Zhang NN, Bu P, Zhu HH, Shen WG.
Department of Gastroenterology, Subei People's Hospital, Yangzhou, Jiangsu 225001, P. R. China.
BACKGROUND & OBJECTIVE: Various chemically synthetic anti-angiogenesis agents have serious side effects. The traditional Chinese medicine has attracted considerable attention because of its low toxicity. This study was to explore the inhibitory effects of Scutellaria barbatae D. Don, a kind of traditional Chinese medicinal anti-cancer herb, on tumor angiogenesis, and investigate its mechanism. METHODS: Matrigel plug and human umbilical vascular endothelial cells (HUVECs) were used to construct in vivo and in vitro models of angiogenesis to assess the effect of Scutellaria barbatae D. Don on angiogenesis. After cultured with Scutellaria barbatae D. Don, the migration of endothelial cells was examined by Transwell chamber; the expression of vascular endothelial growth factor (VEGF) in HeLa cells was detected by enzyme-linked immunosorbent assay (ELISA). RESULTS: Scutellaria barbatae D. Don significantly inhibited angiogenesis in Matrigel; the tube formation number was significantly lower in 20% and 40% medicated serum groups containing Scutellaria barbatae D. Don than in 20% and 40% drug-free serum groups (5.6+/-1.1 vs. 9.8+/-1.3, P=0.001; 1.0+/-0.7 vs. 13.4+/-1.1, P<0.001). Migrated endothelial cells was significantly fewer in 20% and 40% medicated serum groups containing Scutellaria barbatae D. Don than in 20% and 40% drug-free serum groups (19.75+/-2.63 vs. 24.25+/-2.06, P=0.038; 14.00+/-2.58 vs. 26.5+/-4.65, P=0.006). When treated for 24 h and 48 h, the expression of VEGF in HeLa cells was significantly lower in 40% medicated serum group containing Scutellaria barbatae D. Don than in 40% drug-free serum group (138.67+/-9.50 vs. 195.82+/-2.43, P=0.006; 93.84+/-41.11 vs. 193.68+/-18.37, P=0.036). CONCLUSION: Scutellaria barbatae D. Don could efficiently inhibit angiogenesis in tumor tissue which might relate with inhibition of endothelial cell migration and down-regulation of VEGF in tumor cells.
PMID: 16351792 [PubMed - indexed for MEDLINE]
Users browsing this forum: No registered users