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Nanotherapeutics for drug targeting

A nanoparticle, prodrug technology, applied in the field of nanotherapeutics for drug targeting, that can solve problems that have not been proposed or developed

Inactive Publication Date: 2015-06-03
PRESIDENT & FELLOWS OF HARVARD COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods, or alternatives, have not been suggested or developed for the targeted delivery of drugs to narrow sites in blood vessels or other fluid-filled passages in the body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0428] Nanoparticle Preparation: Nanoparticles (NP) were prepared from PLGA (50:50, 17 kDa, acid-terminated; Lakeshore Biomaterials, AL) using a simple solvent exchange method (26). The fluorescent hydrophobic dye coumarin-6 was incorporated into the NPs to enable visualization and quantification in this study. Briefly, 1 mg / ml polymer was dissolved in dimethyl sulfoxide (DMSO, Sigma, MO) containing 0.1 wt% coumarin, dialyzed against water at room temperature, and passed through solvent exchange and subsequently in an aqueous solvent self-assembly such that the nanoparticles are formed. The size distribution and morphology of the formed NPs were characterized using dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

[0429] Production of SA-NTs: PLGA NPs were centrifuged and concentrated to a 10 mg / ml suspension in water, and 1 mg / ml of L-leucine (Spectrum Chemicals & Laboratory Products, CA) was added. NP aggregate...

Embodiment 2

[0487] Example 2: Shear Stress Controlled Release from RBCs

[0488] Red blood cell ghost cells were prepared using hypotonic hemolysis. Briefly, RBCs were centrifuged from blood (2000 g, 10 min) and resuspended in calcium / magnesium-free diluted PBS (1:10 volume ratio of PBS to DD water). The cells were incubated at 4°C for 15 minutes and then centrifuged (12,000 g, 10 min). This process was repeated four times. The cells were subsequently loaded with FITC-dextran by incubating the cells with 5 mg / ml of dextran in diluted PBS for 1 hour at 4°C. The cells were centrifuged, suspended in PBS buffer containing calcium / magnesium, and allowed to reseal within more than two hours in a 37°C incubator. After the reclosure procedure, the cells were washed four times in PBS to remove any residues in solution. Figure 8 Fluorescence images of FITC-dextran-loaded RBC ghost cells are shown, imaged 5 days after preparation of the FITC-dextran-loaded RBC ghost cells.

[0489] A suspensio...

Embodiment 3

[0490] Example 3: Shear Stress Controlled Release from Microcapsules

[0491] For nanocapsules, rhodamine dye-encapsulated Pluronic / polyethyleneimine (F127 / PEI) nanocapsules (S.H.Choi, S.H.Lee & T.G., Park , Temperature-sensitive pluronic / poly(ethyleneimine) nanocapsules for thermally triggered disruption of intracellular endosomal compartment, Biomacromolecules. 2006 Jun; 7(6):1864-70). Briefly, Pluronic F127 was activated with p-nitrophenyl chloroformate in toluene for 24 hours at room temperature. The product was precipitated in ether and passed through 1 H NMR characterization. To prepare the nanocapsules, 30% of activated F127 and a small amount of hydrophobic dye (rhodamine) were dissolved in dichloromethane (1 ml), then added dropwise to 10 ml of aqueous PEI solution (7.5w / v, pH 9) . The mixture was stirred at room temperature for about 1 hour to obtain nanocapsules / microcapsules, and the entrapped dichloromethane was distilled off. The microcapsules obtained are s...

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Abstract

The invention provides compositions and methods for targeted controlled drug release. The compositions and methods can be used for treating or imaging vascular stenosis, stenotic lesions, occluded lumens, embolic phenomena, thrombotic disorders and internal hemorrhage.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(e), this application claims priority to U.S. Provisional Application No. 61 / 656,753, filed June 7, 2012, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to compositions and methods for the targeted delivery and controlled release of therapeutic or imaging agents to a desired site. The present invention also relates to compositions and methods for the treatment or imaging of stenosis, stenotic lesions, thrombolytic therapy, and internal bleeding. Background technique [0004] Selective drug delivery to defined disease sites is one of the most promising advantages of nanoscale drug carriers. Targeting of drugs and imaging agents is based on exploiting abnormal features of disease states such as elevated pH in tumors, increased vascular permeability in cancer, decreased oxygen levels in hypoxic regions , up-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K9/16A61K47/48A61K39/395A61K48/00
CPCA61K9/0009A61K9/5146A61K48/0041A61K9/5153A61K47/60A61K47/6937A61K38/482C12Y304/21068A61K41/13A61P31/00A61P31/04A61P35/00A61P43/00A61P7/00A61P7/02A61P9/08A61P9/10A61P9/14A61K47/34A61K49/225C08G63/06
Inventor 唐纳德·E·英格贝尔内塔尼尔·科林马图迈·卡纳帕斯皮尔来奥克塔伊·乌尊安妮-劳雷·帕帕
Owner PRESIDENT & FELLOWS OF HARVARD COLLEGE
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