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Polymer nanoparticles coated by magnetic metal oxide and uses thereof

a technology of magnetic metal oxide and nanoparticles, applied in the direction of peptide/protein ingredients, powder delivery, energy-modified materials, etc., can solve the problems of iron ions leaching, large size distribution, instability towards agglutination process, etc., to reduce or inhibit the growth of tumor cells, reduce or inhibit the growth of tumors, and reduce or inhibit tumor growth

Inactive Publication Date: 2012-06-07
BAR ILAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides nanoparticles made of a polymer coated with a magnetic metal oxide, which can be used for various medical purposes such as detection and treatment of tumors, inflammation, type 2 diabetes, obesity, and anorexia. The nanoparticles can also carry other active agents such as peptides, peptidomimes, polypeptides, or small molecules that can further enhance their therapeutic effects.

Problems solved by technology

Extensive efforts to synthesize efficient iron oxide magnetic nanoparticles have been carried out in the last several years; however, most of these nanoparticles suffer from major disadvantages such as broad size distribution that is considered to be toxic for in vivo medical applications, iron ions leaching and instability towards agglutination processes.

Method used

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  • Polymer nanoparticles coated by magnetic metal oxide and uses thereof
  • Polymer nanoparticles coated by magnetic metal oxide and uses thereof
  • Polymer nanoparticles coated by magnetic metal oxide and uses thereof

Examples

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Effect test

example 1

Synthesis and Characterization of Gelatin / Iron-Oxide Magnetic Composite Nanoparticles

[0124]Gelatin / iron oxide magnetic composite nanoparticles of sizes ranging from ca. 5 nm up to 100 nm with narrow size distribution were prepared by nucleation followed by controlled growth of magnetic iron oxide thin films onto gelatin / iron oxide nuclei, as described in detail in WO 99 / 062079. The nucleation step was based on complexation of Fe+2 ions to chelating sites of the gelatin, followed by partial oxidation (up to approximately 50%) of the chelated Fe+2 to Fe+3, so that the water soluble gelatin contained both chelated Fe+2 and Fe+3 ions. Gelatin / iron oxide nuclei were than formed by adding NaOH or, alternatively, ammonia aqueous solution up to ca. pH 9.5. The growth of magnetic films onto the gelatin nuclei accomplished by repeating several times the nucleation step.

[0125]Briefly, nanoparticles of 15 nm average dry diameter were prepared by adding FeCl2 solution (10 mmol / 5 ml H2O) to 80 ml...

example 2

Synthesis of Fluorescent Dye-Labeled Gelatin / Iron Oxide Magnetic Composite Nanoparticles

[0127]Fluorescent dye-labeled gelatin / iron oxide magnetic composite nanoparticles in which the fluorescent dye is mainly entrapped within the magnetic composite nanoparticles were prepared as described in Example 1, substituting the gelatin for gelatin covalently bound to a fluorescent dye, as illustrated in FIG. 7. For example, rhodamine-labeled nanoparticles were prepared by adding slowly 0.5 ml dimethyl sulfoxide (DMSO) containing 5 mg of rhodamine isothiocyanate (RITC) to 20 ml aqueous solution containing 200 mg gelatin. The pH of the aqueous solution was raised to 9.5 by adding NaOH aqueous solution (1 N), and the solution was shaken for 1 h at 60° C. This process involves the covalent binding, via thiourea and / or thiourethane bonds, between the part of the hydroxyl and amine groups of the gelatin and the isothiocyanate of the RITC. Excess of RITC was then removed from the gelatin conjugated...

example 3

Synthesis of Drug(s) Containing Gelatin / Iron Oxide Magnetic Composite Nanoparticles

[0129]Drug containing gelatin / iron oxide magnetic composite nanoparticles were prepared as described in Example 1, substituting the gelatin for gelatin covalently bound to the drug. For example, adriamycin (Aldrich) was covalently bound to the gelatin via the carbodiimide activation method, as described by Melamed and Margel (2001). Briefly, 123 mg NHS (N-hydroxysuccinimide, Sigma) and 82 mg CDC (1-cyclohexyl-3-(2-morpholinoethyl) carbodiimide metho-p-toluenesulfonate, Sigma) were added to 20 ml MES buffer (0.01 m at pH 5.0, Sigma) containing 200 mg gelatin and 5 mg adriamycin, and the solution was then shaken at 60° C. for 2 h. The solution was washed from excess reagent by dialysis (cut off: 12-14000) against water. The volume of the solution was adjusted to 80 ml and the synthesis was then continued as described in Example 1.

[0130]In a similar process, gelatin / iron oxide magnetic composite nanopart...

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Abstract

The invention provides nanoparticles consisting of a polymer which is a metal chelating agent coated with a magnetic metal oxide, wherein at least one active agent is covalently bound to the polymer, said nanoparticles may optionally further comprise at least one active agent physically or covalently bound to the outer surface of the magnetic metal oxide. Pharmaceutical compositions comprising these nanoparticles may be used, inter alia, for detection and treatment of tumors and inflammations.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority as a continuation application to U.S. patent application Ser. No. 12 / 232,818, filed on Sep. 24, 2008; which claims the benefit of U.S. Provisional Patent Application No. 60 / 960,270, filed on Sep. 24, 2007, the entire contents of which being herewith incorporated by reference in its entirety as if fully disclosed herein.FIELD OF THE INVENTION[0002]The present invention provides nanoparticles consisting of a polymer which is a metal chelating agent coated with a magnetic metal oxide, wherein at least one active agent is covalently bound to the polymer, as well as pharmaceutical compositions and uses thereof.BACKGROUND OF THE INVENTION[0003]Nanoparticles are spherical particles in sizes ranging from a few nanometers up to 0.1 μm. Polymeric nano-scaled particles of narrow size distribution are commonly formed by controlled precipitation methods or heterogeneous polymerization techniques, e.g., by optima...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K49/06A61K38/39A61K38/19A61K38/20A61K31/519A61K38/43A61K39/395A61K38/22A61K49/04A61P29/00A61P35/00A61K49/00A61K31/704B82Y5/00
CPCA61K41/0052A61K47/48853A61K47/48861A61K47/48238A61K49/1878B82Y5/00A61K47/48907A61K47/62A61K47/6921A61K47/6923A61K47/6935A61P1/14A61P3/04A61P3/10A61P29/00A61P35/00A61P35/02A61K49/1866
Inventor MARGEL, SHLOMOPERLSTEIN, BENNYBRODIE, CHAYAMIKKELSEN, TOM
Owner BAR ILAN UNIV
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