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Nasongkla N Boongird A Hongeng S Manaspon C Larbcharoensub N 《Journal of materials science. Materials in medicine》2012,23(2):497-505
We describe the development of polymer implants that were designed to solidify once injected into rat brains. These implants
comprised of glycofurol and copolymers of d,l-lactide (LA), ε-caprolactone and poly(ethylene glycol) (PLECs). Scanning electron microscopy (SEM) and gel permeation chromatography
(GPC) showed that the extent of implant degradation was increased with LA content in copolymers. SEM analysis revealed the formation of porosity on implant surface as the degradation proceeds. PLEC
with 19.3% mole of LA was chosen to inject in rat brains at the volume of 10, 25 and 40 μl. Body weights, hematological and histopathological data
of rats treated with implants were evaluated on day 3, 6, 14, 30 and 45 after the injection. Polymer solution at the injection
volume of 10 μl were tolerated relatively well compared to those of 25 and 40 μl as confirmed by higher body weight and healing
action (fibrosis tissue) 30 days after treatment. The results from this study suggest a possible application as drug delivery
systems that can bypass the blood brain barrier. 相似文献
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Wannarong Khamlao Suradej Hongeng Jitladda Sakdapipanich Norased Nasongkla 《Journal of Polymer Research》2012,19(3):9834
Copolymers of (D,L-lactide-random-ε-caprolactone)-block-poy(ethylene glycol)-block-(D,L-lactide-random-ε-caprolactone) or
PLEC were explored as materials for injectable drug delivery system. A series of six PLECs were successfully synthesized with
varied D,L-lactide (LA) content (0, 10 and 20%) and molecular weight (20 and 50 kDa). All polymers were able to form depots
with more than 90% encapsulation efficiency of trypan blue leading to the loading density as high as 27% w/w. The variation
of trypan blue loading, LA content and molecular weight were found to have profound effects on trypan blue release profiles.
Even though, GPC and SEM confirmed the higher degradation of PLEC chains, trypan blue release rate and burst release was greater
as the content of hydrophilic moiety, i.e. LA, was decreased. This was primarily due to the smooth and dense surface and cross-section
of PLEC depots. The results from this study suggest a possible application of these depots as injectable, self-solidifying
drug delivery systems. 相似文献
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Koollawat Chupradit Wannisa Khamaikawin Supachai Sakkhachornphop Chaniporn Puaninta Bruce E. Torbett Suparerk Borwornpinyo Suradej Hongeng Methichit Wattanapanitch Chatchai Tayapiwatana 《International journal of molecular sciences》2022,23(4)
Human hematopoietic stem/progenitor cell (HSPC)-based gene therapy is a promising direction for curing HIV-1-infected individuals. The zinc finger protein (2LTRZFP) designed to target the 2-LTR-circle junction of HIV-1 cDNA was previously reported as an intracellular antiviral molecular scaffold that prevents HIV integration. Here, we elucidate the efficacy and safety of using 2LTRZFP in human CD34+ HSPCs. We transduced 2LTRZFP which has the mCherry tag (2LTRZFPmCherry) into human CD34+ HSPCs using a lentiviral vector. The 2LTRZFPmCherry-transduced HSPCs were subsequently differentiated into macrophages. The expression levels of pro-apoptotic proteins of the 2LTRZFPmCherry-transduced HSPCs showed no significant difference from those of the non-transduced control. Furthermore, the 2LTRZFPmCherry-transduced HSPCs were successfully differentiated into mature macrophages, which had normal phagocytic function. The cytokine secretion assay demonstrated that 2LTRZFPmCherry-transduced CD34+ derived macrophages promoted the polarization towards classically activated (M1) subtypes. More importantly, the 2LTRZFPmCherry transduced cells significantly exhibited resistance to HIV-1 integration in vitro. Our findings demonstrate that the 2LTRZFPmCherry-transduced macrophages were found to be functionally and phenotypically normal, with no adverse effects of the anti-HIV-1 scaffold. Our data suggest that the anti-HIV-1 integrase scaffold is a promising antiviral molecule that could be applied to human CD34+ HSPC-based gene therapy for AIDS patients. 相似文献
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Event detection and analysis from video streams 总被引:9,自引:0,他引:9
Medioni G. Cohen I. Bremond F. Hongeng S. Nevatia R. 《IEEE transactions on pattern analysis and machine intelligence》2001,23(8):873-889
We present a system which takes as input a video stream obtained from an airborne moving platform and produces an analysis of the behavior of the moving objects in the scene. To achieve this functionality, our system relies on two modular blocks. The first one detects and tracks moving regions in the sequence. It uses a set of features at multiple scales to stabilize the image sequence, that is, to compensate for the motion of the observer, then extracts regions with residual motion and uses an attribute graph representation to infer their trajectories. The second module takes as input these trajectories, together with user-provided information in the form of geospatial context and goal context to instantiate likely scenarios. We present details of the system, together with results on a number of real video sequences and also provide a quantitative analysis of the results 相似文献
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