Freeze-Dried Composition of Inactivated Virus Envelope with Membrane Fusion Activity

a technology of inactivated virus and composition, which is applied in the direction of viruses/bacteriophages, biochemistry apparatus and processes, and ingredients of genetic materials, etc., can solve the problems of inability to efficiently introduce genes for nonviral vectors, cumbersome steps, and virus vectors, etc., and achieves the effects of not easy to deteriorate, not easy to store, and not easy to transpor

Inactive Publication Date: 2008-05-01
ISHIHARA SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029]The inactivated virus envelopes having membrane fusion activity reported so far have to be stored in a freezer (−20° C.), preferably in an ultracold freezer (−70° C. or below). For example, the inactivated HVJ envelope can substantially lose its ability to introduce foreign matters during about two weeks of refrigeration, and therefore, it is hardly storable in a place without freezing or ultracold freezing equipment and cannot stand a long time of transportation. The freeze-dried composition of an inactivated virus envelope having membrane fusion activity of the present invention is storable at room temperature (25° C. or below), easy to handle and free of restrictions on the place of use or transportation. Further, the method of introducing a foreign matter of the present invention drastically improves the transfer efficiency, is easier and finds widespread applications such as high throughput analyses.

Problems solved by technology

However, viral vectors can have cause problems due to simultaneous expression of essential genes of the parent virus, leaky expression of viral genes, immunogenicity and modification of the host genome structure.
While nonviral vectors are less cytotoxic and immunogenic, nonviral vector systems have a problem that nonviral vectors cannot introduce genes as efficiently as some viral vectors because in nonviral vector systems, foreign matters are taken up by cells endocytotically.
However, in addition of preparation of the inactivated HVJ envelope, cumbersome steps such as preparation of the liposome and isolation of the HVJ-liposome after fusion are required.
On the other hand, though the inactivated HVJ envelope can be cryopreserved (−70° C.) in suspension without losing its gene transfer ability, no reports have been made about its freeze-drying storage, presumably because freeze-drying spoils the function or structure of the inactivated HVJ envelope having membrane fusion activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]120 μl of an inactivated HVJ envelope, GenomOne (registered trademark, Ishihara Sangyo Kaisha, Ltd.) (OD: 0.25, amount: 6000 HAU) was put into vials and centrifuged at 10,000 rpm for 30 minutes, and the supernatants were removed. The resulting precipitates were washed by suspending them in 40 μl of distilled water, centrifuging the suspensions again at 10,000 rpm for 30 minutes and removing the supernatants. The precipitates were suspended in 60 μl of a 0.2% polypeptone solution in distilled water (Sample 1, and similar references will be made hereinafter), a 0.2 mannitol solution in distilled water (Sample 2), a 0.2% methyl cellulose solution in distilled water (Sample 3) or a 0.2% trehalose solution in distilled water (Sample 4), and the suspensions were frozen quickly in liquid nitrogen.

[0057]Frozen Samples 1 to 4 were freeze-dried in a vacuum of at most 0.1 mmHg at a trap temperature of at most −70° C. for 5 hours in a vacuum desiccator under temperature control by soaking...

example 2

[0059]From 120 μl portions of GenomOne (registered trademark, Ishihara Sangyo Kaisha, Ltd.) (OD: 0.25, amount: 6000 HAU), precipitates were prepared in the same manner as in Example 1. The precipitates were suspended in 60 μL of a 0.5% polypeptone solution in distilled water (Sample 5, and similar references will be made hereinafter), a 0.5% polypeptone and 0.1% methyl cellulose solution in distilled water (Sample 6), a 1.0% polypeptone and 0.1% methyl cellulose solution in distilled water (Sample 7), a 1.5% polypeptone and 0.1% methyl cellulose solution in distilled water (Sample 8) or a 2.5% polypeptone and 0.1% methyl cellulose solution in distilled water (Sample 9), and the suspensions were frozen quickly in liquid nitrogen.

[0060]From the subsequent step, Example 1 was followed to obtain Samples 5 to 9 of freeze-dried compositions.

example 3

[0061]From 120 μl portions of GenomOne (registered trademark, Ishihara Sangyo Kaisha, Ltd.) (OD: 0.25, amount: 6000 HAU), precipitates were prepared in the same manner as in Example 1. The precipitates were suspended in 60 μL of a 1.0% polypeptone solution in distilled water (Sample 10, and similar references will be made hereinafter), a 1.0% bactopeptone solution in distilled water (Sample 11), a 1.0% bactotriptone solution in distilled water (Sample 12), a 1.0% casein acid-hydrolysate in distilled water (Sample 13), a 0.3% L-leucine solution in distilled water (Sample 14), a 1.0% β-alanine solution in distilled water (Sample 15), a 0.3% L-arginine monohydrochloride in distilled water (Sample 16) or a 1.0% L-aspartic acid solution in distilled water (Sample 17), each containing 0.1% methyl cellulose, and frozen quickly in liquid nitrogen. From the subsequent step, Example 1 was followed to obtain Samples 10-17 of freeze-dried compositions.

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Abstract

The objects of the present invention are to provide a freeze-dried composition of an inactivated virus envelop having membrane fusion activity which can be stored at higher temperatures without losing the ability to introduce foreign matters and to provide a method of introducing a foreign matter into a cell with high efficiency.The present invention provides a freeze-dried composition for introducing a foreign matter which comprises an inactivated virus envelope having membrane fusion activity, and at least one stabilizer selected from the group consisting of a protein hydrolysate, leucine, an L-arginine-acid and a polysaccharide, and a method of introducing a foreign matter using the freeze-dried composition containing an inactivated virus envelope.

Description

TECHNICAL FIELD[0001]The present invention relates to a freeze-dried composition used for introduction of nucleic acid, protein or drugs into cells and living organisms, a process for its production and its use.BACKGROUND ART[0002]In recent years, various viral and nonviral (synthetic) vector systems have been developed to introduce foreign matters such as genes into cells or living organisms. In general, for intracellular gene delivery, viral vector systems can introduce foreign matters more effectively than nonviral vector systems. However, viral vectors can have cause problems due to simultaneous expression of essential genes of the parent virus, leaky expression of viral genes, immunogenicity and modification of the host genome structure. While nonviral vectors are less cytotoxic and immunogenic, nonviral vector systems have a problem that nonviral vectors cannot introduce genes as efficiently as some viral vectors because in nonviral vector systems, foreign matters are taken up...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N15/86C12N7/04A61K9/19A61K35/76A61K47/16A61K47/36A61K47/42A61K48/00C12N7/00
CPCA61K9/19C12N2770/24151C12N7/00A61K48/00
Inventor UEDA, TAKAFUMI
Owner ISHIHARA SANGYO KAISHA LTD
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