Cysteamine Suppresses Invasion, Metastasis and Prolongs Survival by Inhibiting Matrix Metalloproteinases in a Mouse Model of Human Pancreatic Cancer

Background: Cysteamine, an anti-oxidant aminothiol, is the treatment of choice for nephropathic cystinosis, a rare lysosomal storage disease. Cysteamine is a chemo-sensitization and radioprotection agent and its antitumor effects have been investigated in various tumor cell lines and chemical induced carcinogenesis. Here, we investigated whether cysteamine has anti-tumor and anti-metastatic effects in transplantable human pancreatic cancer, an aggressive metastatic disease. Methodology/Principal Findings: Cysteamine’s anti-invasion effects were studied by matrigel invasion and cell migration assays in 10 pancreatic cancer cell lines. To study mechanism of action, we examined cell viability and matrix metalloproteinases (MMPs) activity in the cysteamine-treated cells. We also examined cysteamine’s anti-metastasis effect in two orthotopic murine models of human pancreatic cancer by measuring peritoneal metastasis and survival of animals. Cysteamine inhibited both migration and invasion of all ten pancreatic cancer cell lines at concentrations (,25 mM) that caused no toxicity to cells. It significantly decreased MMPs activity (IC50 38–460 mM) and zymographic gelatinase activity in a dose dependent manner in vitro and in vivo; while mRNA and protein levels of MMP-9, MMP-12 and MMP-14 were slightly increased using the highest cysteamine concentration. In vivo, cysteamine significantly decreased metastasis in two established pancreatic tumor models, although it did not affect the size of primary tumors. Additionally, cysteamin

Transfer of orally administrated iodine-131 into chicken eggs

WOS: 000181492200002PubMed ID: 12595007Radioactive iodine-131 as both as free iodide ((NaI)-I-131) and covalently bound to aniline (aniline-I-131) was added to the drinking water of two Leghorn laying hens as a single dose and also as a cumulative dose over 1 week. The radioactivity of the principal parts of the eggs, i.e. shell, white, and yolk, was measured, and the radioactivity levels per gram material, and percent of the total radioactivity were calculated. The radioactivity measurements were continued for 1 month following the administration of I-131. In the case of the single dose administration, the results obtained showed that about 15% of the total radioactivity administered as (NaI)-I-131 was transported into the egg structure; compared to only about 1% for aniline-I-131. After cumulative administration, about 15% of the total administered radioactivity was transported into the egg structure with both forms of I-131. This was probably because of metabolic cleavage of iodine bonds in the labeled aniline molecules during the longer period of exposure. These results also showed considerable accumulation of I-131 in the egg yolks. In the case of the single dose administration, I-131 can be detected in eggs up to about 20 days after administration, and up to about 30 days, in the case of the cumulative administration over 1 week. (C) 2003 Elsevier Science Ltd. All rights reserved

18FDG conjugated magnetic nanoparticle probes: Synthesis and in vitro investigations on MCF-7 breast cancer cells

18FDG conjugated magnetic iron oxide nanoparticles (MNPs) were synthesized as PET-MR hybrid imaging agent. Synthesized and characterized NPs were then applied to MCF-7 human breast cancer cells. 18FDG conjugated MNPs exhibited the cell incorporation ratio up to 30 %. As well as the characterization studies, apoptotic effects were observed depending on the cellular incorporations by the time. In conclusion, synthesized structures could have a potential as hybrid imaging agent in PET-MR imaging systems besides apoptotic effect on cancer cells. © 2012 Akadémiai Kiadó, Budapest, Hungary.Central University Basic Scientific Research Business Expenses Special Funds Ege ÜniversitesiAcknowledgments The authors thank to Ege University Scientific Research Fund for the financial support with the Project Numbers 2008 NBE 08 and 2009 FEN 007. Authors also thank to Adnan Menderes University Science Technology Research and Application Center for cell culture experiments. -

(18)FDG conjugated magnetic nanoparticle probes: synthesis and in vitro investigations on MCF-7 breast cancer cells

WOS: 000314895400026(18)FDG conjugated magnetic iron oxide nanoparticles (MNPs) were synthesized as PET-MR hybrid imaging agent. Synthesized and characterized NPs were then applied to MCF-7 human breast cancer cells. (18)FDG conjugated MNPs exhibited the cell incorporation ratio up to 30 %. As well as the characterization studies, apoptotic effects were observed depending on the cellular incorporations by the time. In conclusion, synthesized structures could have a potential as hybrid imaging agent in PET-MR imaging systems besides apoptotic effect on cancer cells.Ege University Scientific Research FundEge University [2008 NBE 08, 2009 FEN 007]The authors thank to Ege University Scientific Research Fund for the financial support with the Project Numbers 2008 NBE 08 and 2009 FEN 007. Authors also thank to Adnan Menderes University Science Technology Research and Application Center for cell culture experiments