CN100379458C - Gene transfer methods - Google Patents

Abstract

Improved methods for transferring a gene into target cells by using a retrovirus, wherein the gene transfer efficiency is improved and the target cells are efficiently transformed by binding the retrovirus to a functional substance which is immobilized on as carrier and having an activity of binding to retroviruses followed by washing; using an antibody capable of specifically recognizing cells, laminin or mannose-rich type sugar chain as a substance having an activity of binding to the target cells; pre-treating the target cells so as to inactivate transferrin receptor, or introducing a new functional group into the functional substance.

Description

The method that gene imports

The application is that international filing date is dividing an application of June 25, application number in 1999 application that is entitled as " method of gene introduction " that is 99810079.X.

Technical field

This invention is relevant with a kind of methodology, and this method can increase gene and import the efficient of target cell and target cell is transduceed effectively, and relates to a series of and the relevant technology in field such as medical science, cell technology, genetic engineering, growth technology.

Technical background

The pathogeny of a lot of human diseasess is illustrated.Recombinant DNA technology and the technical progress of gene transfered cell is very fast.In this case, the somatic cell gene therapy method for the treatment of serious hereditary is set up recently.Recently, people attempt gene therapy methods not only is used for the treatment of hereditary, and are used for the treatment of viral infection (as AIDS) and cancer.

So far, great majority are the gene therapy to people's clinical practice by examination, by with recombinant retroviral vector with the gene transfered cell.Retroviral vector can also stably be gone into purpose exogenous gene transfered cell in their chromosomal DNA with gene integration effectively.Therefore, this is a kind of method of gene introduction of preferentially selecting for use, particularly wishes to have the gene therapy of long-term gene expression.In order to eliminate the injurious effects of the gene pairs body that is imported into, this carrier has passed through different improvement.For example, eliminate the copy function of described carrier, when repeating unrestricted infection (gene importing), the carrier that is used for the gene importing does not duplicate in cell like this.

Because this carrier (duplicating-the defective retroviral vector) can not self-replicating, therefore usually by using retrovirus cellulation (incasing cells) preparation involucrum at the intragranular carrier of virus-virus.The simplest method that gene can be imported effectively target cell comprises target cell and retrovirus cellulation co-cultivation.Yet in the method, the retrovirus cellulation may pollute the target cell of the quiding gene that will be implanted into live body.

Recently, report is arranged when fibronectin (extracellular matrix components) or its fragment exist, can increase with efficient (J.Clin.Invest., the 93:1451-1457 (1994) of retrovirus with the gene transfered cell; Blood, 88:855-862 (1996)).And prove that the CH-296 of producing with gene engineering has similar character and can be in order to effectively exogenous gene is imported (WO95/26200) in the hematopoietic stem cell.Therefore prompting since the gene importing efficient that fibronectin increases be with the heparin-calmodulin binding domain CaM of fibronectin with retroviral combine relevant.

In addition, disclosed functional materials in WO97/18318 (rather than fibronectin, as fibroblast growth factor) can increase the efficient that gene imports.Also open in the bulletin, when use a kind of have combine active functional materials and the another kind of increase of also observing similar gene importing efficient when having the mixture that combines active functional materials with cell with retrovirus.

Under the situation that does not have retrovirus cellulation and target cell co-cultivation, the method for gene introduction of application function material can carry out gene effectively and import.Therefore think that increase that gene in this method imports efficient is owing to increasing interactional probability between the retrovirus that closely is positioned at altogether together and the target cell under the help of functional materials.

In the gene that carries out with retrovirus imports, use the retroviral infection target cell, cause gene to import by the above.Yet the efficient of carrying out the gene importing with retrovirus still can not satisfy actual clinical practice.Therefore expectation further increases efficiency of infection.

Increasing efficiency of infection or gene importing efficient also can realize by retroviral concentration (titre) in the used viral suspension (supernatant) of increase.Yet making up and set up a kind of viral cellulation that can generate infectious titer needs a large amount of work usually.The pseudotyped viral vector [Proc.Natl.Acad.Sci.USA, 90:8033-8037 (1993)] that is used to form from the envelope protein of vesicular stomatitis virus can be through centrifugal and concentrated.But because this method for concentration can only be used for this carrier, so this method can not be widely used.

In addition, even when target cell purity is low, when importing, gene also can reach high gene importing efficient with retrovirus specific infection target cell.Neither one is convenient, high-efficiency method yet this area present stage goes back.

Goal of the invention

In sum, the method that main purpose of the present invention provides a kind of improvement is used to utilize retrovirus that gene is imported target cell, and this method has improved gene and imported efficient, and the target cell of transduceing effectively.

Hereinafter, will explain other purpose and advantage of the present invention in detail with reference to accompanying drawing.

The accompanying drawing summary

Fig. 1 shows the structure of the high mannose type sugar chain that contains nine mannose residues in the molecule.

Fig. 2 is shown in the gene that CH-296 reached that applied chemistry is modified among the embodiment 3 and imports efficient (%).

In the research of the influence of removing the viral infection inhibiting substances, gene imports efficient (%) and contact/relation between the binding time relatively in Fig. 3 illustrated embodiment 13.

In Fig. 4 illustrated embodiment 15, utilize centrifugation method retrovirus to be attached in the research of the influence on the functional materials, gene imports the relation between efficient (%) and the viral separately integrating step relatively.

In Fig. 5 illustrated embodiment 15, the gene that reaches with centrifuging or centrifugal infection method imports efficient (%).

Summary of the invention

The present inventor finds, contacts with retrovirus by having in conjunction with reverse transcription disease cytotoxic activity and the functional materials that is fixed on the holder, then washs holder before target cell infection, can increase gene importing efficient.

The present inventor also finds, when all if specific binding exists to the functional materials of antibody, the laminin of target cell, the sugar chain that derives from laminin or high mannose type sugar chain etc., by can be special with the retroviral infection target cell and effectively gene is imported the purpose target cell.

The present inventor further finds before carrying out gene imports that suitably the pretreatment target cell can increase gene and imports efficient.

In addition, the present inventor also finds can improve and have the effect that gene is imported in conjunction with the functional materials of virus activity to increase its alkali with chemical method rhetorical function material.

This invention is that the present inventor finishes based on these new discoveries.

Therefore, first aspect of the present invention is with retrovirus gene to be imported the method for target cell, and this method feature comprises:

(1) will contain retroviral solution contacts with having in conjunction with reverse transcription disease cytotoxic activity and the functional materials that is fixed in holder;

(2) wash this and be combined with retroviral holder; With

(3) this being combined with retroviral holder also hatches with the target cell contact;

There is not any restriction when carrying out the above-mentioned first step, as continuing 1 hour or the longer time, preferably 3 hours or longer time.In addition, can increase retrovirus through the method for physics and have the contact frequency that combines between the active functional materials of retrovirus.

Being used for the example that has in conjunction with the active functional materials of retrovirus of the present invention, to include but not limited to that fibronectin, fibroblast growth factor, collagen type v albumen, polylysine and DEAE-glucosan and their fragment and other have identical in conjunction with the active material of retrovirus.Described functional materials can have the activity in conjunction with target cell.Alternatively, this functional materials also can have the active functional materials of the target cell of combination with another and is used in combination.The spendable example that has in conjunction with the active functional materials of target cell includes but not limited to cell-attachment proteins, hormone, cytokine, antibody, sugar chain, carbohydrate and metabolite.

For example, the culture supernatant of retrovirus cellulation can be used for gene as retrovirus among the present invention imports.Can promote in the presence of material that retrovirus generates is as sodium butyrate culture supernatant as described in the acquisition having.

Second aspect of the present invention is that a kind of retrovirus that utilizes imports the method for target cell with gene, and the feature of this method has been included in following two functional materials and has existed and use the retroviral infection target cell down:

(1) has in conjunction with the active functional materials of retrovirus; With

(2) the energy specificity is in conjunction with the antibody of target cell.

Be used for of the present inventionly can specificity including but not limited to discern the antibody of the biological material on target cell surface in conjunction with the example of the antibody of target cell.

The 3rd aspect of the present invention is that a kind of retrovirus that utilizes imports the method for target cell with gene, and the feature of this method is included in following two functional materials and exists and use the retroviral infection target cell down:

(1) has in conjunction with the active functional materials of retrovirus; With

(2) laminin, laminin fragment, the sugar chain that derives from laminin or high mannose type sugar chain.

The example that has in conjunction with the active functional materials of retrovirus that can be used for the present invention second and the third aspect comprises, but be not limited to, fibronectin, fibroblast growth factor, collagen type v albumen, poly-D-lysine and DEAE-glucosan and fragment thereof, and other has identical in conjunction with the active material of retrovirus.This functional materials can have the activity in conjunction with target cell.In addition, also this functional materials can be fixed on the suitable holder and use.

The 4th aspect of the present invention is that a kind of retrovirus that utilizes imports the method for target cell with gene, and the feature of this method is cultivated target cell earlier before being included in target cell contact retrovirus in the culture medium that contains low concentration ferrum.The example that can be used for culture medium of the present invention includes, but not limited to contain the culture medium of deferoxamine.Be preferably under the functional materials existence and carried out this method.

The 5th aspect of the present invention relates to increases peptide chain or protein and the bonded active method of retrovirus, and the feature of this method comprises with chemical method modifies peptide chain or protein.The example of chemical modification includes, but not limited to activate the introducing of peptide chain or proteinic amino acid residue and alkali residue.For example, preferably handle peptide chain or protein carries out the activation of described amino acid residue, do not have what restriction with water miscible carbodiimides or with water miscible carbodiimides and diamino compounds.Can preferably peptide chain or the protein through chemical modification that obtains in this way be used for retrovirus gene being imported target cell.

Detailed Description Of The Invention

In method of gene introduction of the present invention, use the retroviral vector of reorganization usually.Specifically, advantageous applications replication defective recombinant retroviral vector.The replication capacity of this carrier removed so that its can not be in infected cells self-replicating, therefore this carrier does not have pathogenic.Described carrier can enter in the host cell (particularly mammalian cell) as vertebrate cells, and stably will insert and carry an intravital exogenous origin gene integrator and go in the described chromosomal DNA.

Among the present invention, by exogenous gene being inserted recombinant retroviral vector and under the control of the LTR of a suitable promoter such as retroviral vector promoter or an exogenous promoter, exogenous gene being imported target cell.In addition, transcribe effectively, also can have in the carrier with this promoter and open synergistic another adjusting composition (as enhancer sequence or terminator sequence) in beginning site with transcribing in order to make this exogenous gene.The exogenous gene of this importing can be a natural gene or the gene of an artificial preparation.In addition, exogenous gene also can be the gene of dna molecular through connecting or combining with other method known in the art of separate sources.

People can select anyly to want the gene of transfered cell to insert this retroviral vector as described exogenous gene.For example, with the enzyme of treatment disease association or protein, intrabody (for example referring to, WO94/02610), somatomedin, antisensenucleic acids, ribozyme, false primer (for example referring to, WO90/13641) encoding gene of Denging can be used as described exogenous gene.

The retroviral vector of using among the present invention also contains suitable marker gene, and it can select the cell of quiding gene.For example, maybe can be with the drug resistance gene of giving the cell antibiotic resistance with the reporter gene of distinguishing the cell of quiding gene by the detection of enzymatic activity gene as a token of.

Can be used for carrier of the present invention and comprise, for example, retroviral vector such as MFG carrier (No. the 68754th, ATCC), α-SGC carrier (No. the 68755th, ATCC) and LXSN carrier [BioTechniques, 7:980-990 (1989)].The retroviral vector that uses among the embodiment (comprising the PM5neo carrier) comprises and contains neomycin phosphotransferase gene gene [Exp.Hematol. as a token of hereinafter, 23:630-638 (1995)], therefore can prove as a kind of index according to the resistance of cell, utilize this carrier with in the gene transfered cell to G418.

Available known package cell line such as PG13 (ATCC CRL-10686), PG13/LNc8 (ATCC CRL-10685), PA317 (ATCC CRL-9078), GP+E-86 (ATCCCRL-9642), GP+envAm12 (ATCC CRL-9641) and  CRIP[Proc.Natl.Acad.Sci.USA, 85:6460-6464 (1988)] virion that becomes of the described preparing carriers of packing.

The Dulbecco culture medium that known culture medium such as DMEM (the Eagle culture medium of Dulbecco improvement) and Iscoves can be improved be used to cultivate the retrovirus cellulation that retroviral vector is imported incasing cells and produce or be used to cultivate target cell.These culture medium are commercialization all, as having bought from Gibco company.Type or other purpose of the target cell that imports according to gene can add different components in these culture medium.As for promote or suppress as described in growth or the differentiation of target cell, can add serum or different cytokines.For example, calf serum (CS) or hyclone (FCS) can be used as serum.Described cytokine comprises interleukin (IL-3, IL-6 etc.), colony stimulating factor (G-CSF, GM-CSF etc.), stem cell factor (SCF), erythropoietin and various cell growth factor.The commercialization of many humanizeds' cytokine.From described cytokine, select to have the cytokine of suitable active by required purpose.In addition, but the described cytokine of use in conjunction.

The culture supernatant that will contain retroviral sample such as viral cellulation is applied in the method for gene introduction of the present invention.The method for preparing this supernatant is not limited to certain specific type.For example, the known sodium butyrate that adds when cultivating viral cellulation can increase the amount [Human Gene Therapy 6:1195-1202 (1995)] that culture supernatant inner virus granule produces.Without a doubt, the viral supernatant of the high titre for preparing like this can be used for method of gene introduction of the present invention.

Method of the present invention is characterised in that, in the presence of the functional materials with retrovirus binding site, uses the retroviral infection target cell.In the presence of this functional materials of effective dose, can obtain the cell that gene imports effectively by the retroviral infection cell.In addition, the function of use material can also easily be removed the viral infection inhibiting substances in the viral supernatant.In addition, have common existence, can make gene importing specificity and/or efficient higher in conjunction with the active functional materials of target cell.

Effective dose used herein is meant the amount that makes the target cell transduction by with retrovirus gene being imported target cell effectively.According to described functional materials of using and the suitable amount of type selecting of target cell.For example, can determine this effective dose by measure gene importing efficient with method described herein.The activity that is attached to target cell as referred to herein not only comprises and the bonded fully activity of target cell, but also is included in the activity that maintenance contacts with target cell in the solution.Can measure described activity based on aforesaid effect to gene importing efficient.In addition, gene importing efficient means transduction efficiency.

Can be dissolved in the above-mentioned functional materials of mentioning in the solution or be fixed on the suitable holder and afterwards use.The holder that is used for fixing functional materials also is not limited to a certain specific type.Usually use cell culture container (vessel) or pearl holder.

When use had in conjunction with the active of virus and is fixed in functional materials on the holder, the step that exemplifies below the use can further increase gene and import efficient.

At first, make and contain retroviral fluid sample (as viral supernatant) and be fixed with the holder that has in conjunction with the active functional materials of retrovirus and contact.Wash this holder.This holder is directly contacted with target cell.Alternatively, can will add target cell from the virion that holder elutes with suitable method.Therefore, quiding gene effectively.Having in conjunction with the active functional materials of retrovirus of described application can have activity in conjunction with target cell.Alternatively, also can be active and combine application in conjunction with retrovirus in conjunction with the active functional materials of target cell with having.

For example, contain retroviral fluid sample and have the holder that combines the active functional materials of retrovirus when being in contact with one another this step with being fixed with, sustainable 1 hour or longer, best 3 hours or longer, do not have what restriction.Equally, other condition comprises that temperature also is not particularly limited.For example, can under room temperature or 37 ℃, carry out this step.According to stability or other character of described virus, also can be with the low temperature about 4 ℃.According to described purpose, can suitably select the holder of fixed function material.If use the container of cell culture,, just can begin the step that gene imports as long as added target cell.Fluid medium of for example, can be with phosphate buffered solution or Hanks ' saline solution, being used to cultivate target cell etc. is used to wash holder.

Method by physics increases the contact frequency between described retrovirus and the described functional materials, and retrovirus is more effectively combined with having in conjunction with the active functional materials of retrovirus.This physical method example includes, but not limited to vibrate, the application of filtration and centrifugal force.Following method is a kind of instantiation that uses centrifugal force: will have retroviral fluid sample to put into a pipe end and fix the centrifuge tube that has in conjunction with the active functional materials of retrovirus, and centrifugal then.This centrifuge tube owing to action of centrifugal force, makes described retrovirus be deposited to this centrifuge tube bottom in centrifugal process.Correspondingly, described retrovirus with have the contact frequency that combines the active functional materials of retrovirus and increase, cause described bonded frequency to increase.The above-mentioned method of mentioning is not cell to be placed not resemble under the physical stress by centrifugal force virus is deposited to the method (WO95/10619) that infects on the cell, and therefore, method of the present invention causes higher gene to import efficient.

Can remove the material that gene imports that is unfavorable for that contains in the retroviral sample with the above-mentioned method of mentioning and carry out the gene importing later on again.For example, the material of removing with method of the present invention comprises retroviral infection inhibiting substances [the Human Gene Therapy 8:1459-1467 (1997) from incasing cells that is contained in the viral supernatant; J Virol., 70:6468-6473 (1996)], for promoting virus to produce the material that when cultivating the retrovirus cellulation, adds, as 12-myristic acid 13-acetic acid phorbol ester (TPA) (phorbol l2-myristate13-acetate) and dexamethasone [Gene therapy, 2:547-551 (1995)] and above-mentioned sodium butyrate.

Can be used for the example that has in conjunction with the active functional materials of retrovirus of the present invention comprises, but be not limited to the territory of the heparin-II of fibronectin, fibroblast growth factor, collagen type v albumen, poly-D-lysine and DEAE-glucosan and the material functional materials of heparin binding site (as have) of identical function is arranged with these functional materials.In addition, can use the polymer of the mixture of described functional materials, the polypeptide that contains this functional materials, this functional materials and the derivant of this functional materials etc.

Can strengthen its activity with chemical method rhetorical function material in conjunction with virus.The example of chemical modification comprises: activate the amino acid residue of applied functional materials, or import the alkali residue in functional materials.For example, activating carboxylic group with water miscible carbodiimides such as 1-ethyl-3-dimethylamino-propyl carbodiimide hydrochloride comes the free carboxy group of the functional materials that modified peptides or protein forms to increase retroviral in conjunction with active.In addition, can increase in the functional materials as described in by the carboxyl of using this Class Activation the alkali residue being imported to as amino as described in conjunction with retroviral activity.

The example in conjunction with the active functional materials of target cell of having that uses among the present invention includes, but not limited to have material in conjunction with the part of target cell.Described part comprises: the antibody of cell adhesion protein, hormone or cytokine, anti-cell surface antigen, polysaccharide, glycoprotein, glycolipid, derive from the sugar chain of glycoprotein or glycolipid and the metabolite of target cell.In addition, can also be with the function of the derivant of the polymer of the polypeptide that contains described functional materials, described functional materials, described functional materials, described functional materials identical material etc.

The antibody that the energy specificity is attached to target cell helps gene specific is imported specific cell effectively especially.Can be used for antibody of the present invention and be not limited to a certain special type.Can suitably select the antigenic antibody of expressing on the target cell of anti-quiding gene for use.Available known method produces such antibody.In addition, also can use commercial many antibody at present.Described antibody can be that polyclonal antibody also can be a monoclonal antibody, as long as it has the required characteristic such as cell-specific.Also can use in addition through the antibody of known technology modification or derivant such as humanized antibody, Fab fragment or the single-chain antibody of antibody.

The existing detailed research of the expression of different cells human leucocyte antigen (being also referred to as T cell differentiation antigen) separately.Therefore, in method of gene introduction of the present invention, but gene is imported target cell by the antibody high special ground of selecting and use the T cell differentiation antigen of can the identifying purpose target cell expressing.For example, gene is directly imported helper T lymphocyte, or gene is imported hematopoietic stem cell with anti-CD34 antibody with anti-CD 4 antibodies.

In addition, can use glycoprotein, laminin gene to be imported different target cells effectively as having in conjunction with the active functional materials of target cell, for example, hematopoietic stem cell.Can be used for laminin of the present invention and can derive from mice or people, or its fragment, as long as it has the activity in conjunction with target cell.Among the described below embodiment, the sugar chain of laminin plays an important role when carrying out the gene importing with laminin.Therefore, also used the sugar chain that discharges from laminin according to known method in the method for the present invention.In addition, also can use among the present invention as the glycoprotein of the high mannose type N-of laminin connection sugar chain or from glycoprotein sugar chain that discharge or chemosynthesis.In addition, can use and be connected with above-mentioned sugar chain and protein or homologue.For example can preferentially select for use the functional materials that has in conjunction with reverse transcription disease cytotoxic activity and connected described sugar chain to carry out the gene importing.

High mannose type sugar chain above-mentioned is not limited to a certain specific type, as long as intramolecularly has 1 to 20 mannose residue.Preferentially select the sugar chain that mannose residue is arranged at its non-reduced end in the methods of the invention for use.Can use be connected in another suitable molecule such as biomolecule (for example, monosaccharide, oligosaccharide, polysaccharide, aminoacid, peptide, protein or lipid) or synthetic material as synthetic macromolecular as described in sugar chain.

To have (mannose) _n-(GlucNAc) ₂For illustrating, the structure of representing derives from organic typical high mannose type sugar chain [Protein, Nucleic Acid and Enzyme, 43:2631-2639 (1998)].For example, in method of gene introduction of the present invention, preferentially select the sugar chain with said structure (mannose) of (but being not limited to) for use ₉-(GlucNAc) ₂, contain 9 mannose residues (structure of this sugar chain is shown in Fig. 1) in its molecule.

Above-described functional materials can be available from (as by recombinant DNA technology or chemical synthesising technology) natural formation, artificial preparation or with the material that combines preparation natural formation and material artificial preparation.In addition, functional materials and another mixture with functional materials of target cell binding site with retrovirus binding site the gene importing can be used for, the described functional materials of WO97/18318 can be used.As selection, also can be applicable to the functional materials that existing retrovirus binding site in the single molecule has the target cell binding site again.Can use and not contain substantially and its natural other relevant proteinic functional materials.In addition, can become gene to import test kit with combined preparation such as the culture medium that is used to cultivate target cell, cell growth factor the compositions of described functional materials or described functional materials.

According to as J Biol Chem., 256:7277 (1981); J Cell Biol., 102:449 (1986) or J Cell Biol., the method described in the 105:489 (1987) can prepare the roughly pure fibronectin that is used for method of the present invention or its fragment from natural material.Also can be according to United States Patent (USP) the 5th, 198, No. 423 described prepares described fibronectin or its fragment with recombinant DNA technology.Specifically, described in detail in the bulletin of above-mentioned patent, containing heparin-II territory is the CH-296 of retrovirus binding site, as comprise in the following embodiments the CH-296 that uses, H-271, the recombinant polypeptide of H-296 and CH-271, and obtain these segmental methods.These fragments can obtain through cultivating following e. coli strains, be deposited in state-run life sciences and human body technical research institute, industrial science and Technical Board, international trade and the Ministry of Industry as what in bulletin, describe with following preserving number, 1-3, Higashi1-chome, Tsukuba-shi, the e. coli strains of Ibaraki-ken: FERM P-10721 (H-296) (former preservation date: on May 12nd, 1989); FERM BP-2799 (CH-271) (former preservation date: on May 12nd, 1989); On May 12nd, 1989) and FERM BP-2264 (H-271) (former preservation date: on January 30th, 1989) FERM BP-2800 (CH-296) (former preservation date:.In addition, the plasmid in the also available known recombinant DNA technology modification e. coli strains prepares representational these segmental fragments that derives from.In CH-296 described above, H-296 has VLA-4 land polypeptide, CH-271 has VLA-5 land peptide and CH-296 has described two lands [Nature Medicine, 2:876-882 (1996)].

In the presence of described functional materials, can obtain the gene transfered cell effectively with the retroviral infection target cell.Can carry out described retroviral infection according to traditional method, as at 37 ℃, 5%CO ₂The middle cultivation.But according to described target cell or these conditions of experimental subject appropriate change and incubation time.

At G ₀During the phase, target cell can not be reversed the record viral infection.Therefore, preferably stimulate target cell to induce described cell to enter cell cycle through pre-.For this reason, before with the described target cell of retroviral infection, earlier target cell is incubated in the culture medium of the somatomedin existence that is suitable for target cell.For example, be used for stimulating in advance medullary cell or hematopoietic stem cell to import different cytokines such as interleukin 3, interleukin-6 and stem cell factor to carry out gene.

The known receptor that in retroviral infection, relates to cell surface.Transport protein of known alkali acidic amino acid and phosphoric acid transport protein are respectively as the receptor of close preferendum virus and anphotropc virus and work [Proc.Natl.Acad.Sci.USA, 93:11407-11413 (1996)].Activate the expression or the metabolism of described transport protein by the described target cell of pretreatment in the culture medium that alkali acidic amino acid or phosphate or salt or its precursor concentration reduce, making target cell is possible to the viral infection sensitivity.

Surprisingly, the present inventor finds to activate TfR (not knowing also at present whether it is relevant with viral infection) also can increase retroviral infection or gene importing efficient.Can by but be not limited in the culture medium of the ferrum that contains concentration limit to handle target cell and activate TfR.For example can use the culture medium of ferrum that added the deferoxamine chelating.

Using the activated gene importing of siderophillin preferably also carries out in the presence of the above-mentioned functions material.

The cell example that is used as the target cell of gene importing in the method for the present invention includes but not limited to stem cell, hematopoietic cell, NA low-density mononuclear cell, adherent cell, medullary cell, hematopoietic stem cell, peripheral hematopoietic stem cells, cord blood cell, the fetal hemopoiesis stem cell, embryo originality stem cell, embryonic cell, primordial germ cells, oocyte, oogonium, ovum, spermatocyte, sperm, the CD34 positive cell, the c-kit positive cell, the multipotency hemopoietic progenitor cell, single potential hemopoietic progenitor cell, the precursor of erythrocyte sample, lymph sample blast cell, mature blood cell, lymphocyte, the B cell, the T cell, fibroblast, neuroblast, neurocyte, endotheliocyte, vascular endothelial cell, hepatocyte, sarcoplast, Skeletal Muscle Cell, smooth muscle cell, cancerous cell, the myeloma cell, leukaemia etc.For using method of the present invention from the hematopoietic cell that blood or bone marrow obtain is preferential, because these cells relatively are easy to get, and the technology of cultivating and keep these cells is also set up.Particularly, if want the gene long-term expression that imports, hematologic progenitor cells such as hematopoietic stem cell, CD34 positive cell, c-kit-positive cell and multipotency hemopoietic progenitor cell are suitable target cells.

For example, can use the gene therapy of hematopoietic stem cell by following step as target cell.

At first, collect the raw material that contains hematopoietic stem cell from donor, as myeloid tissue, peripheral blood and Cord blood.These tissues can be directly used in the gene importing process.Yet, usually contain the mononuclear cell part of hematopoietic stem cell, or be further purified hematopoietic stem cell with the marker molecule of cell surface such as CD34 and/or c-kit with preparations such as densitys.Infect the described raw material that contains hematopoietic stem cell with recombinant retroviral vector, can genes of interest be inserted in the described carrier, if desired, carry out after available suitable cell growth factor stimulates in advance by method of the present invention.Can be with the cell of the quiding gene that obtains like this by giving to be implanted in receiver's body as intravenous.Though described receptor is preferably donor self, also can carry out allograft.For example, if what Cord blood was carried out as raw material promptly is described allograft.

Some are to replenish patient's defective or unusual gene (as the gene therapy of ADA defective or Gaucher ' s disease) with hematopoietic stem cell as the gene therapy of target cell.In addition, drug resistant gene is imported hematopoietic stem cell for example to alleviate owing to be used for the treatment of cancer or leukemic chemotherapeutics to the damage of hematopoietic cell.

Tumor vaccine inoculation treatment has begun to be studied as the method for therapy of tumor.In this therapy, the gene importing cancerous cell with cytokine disappears the multiplication capacity of this tumor cell, then this cell is failed back again in the patient body to promote tumour immunity [HumanGene Therapy, 5:153-164 (1994)].In addition, also attempt to treat acquired immune deficiency syndrome (AIDS) with gene therapy.Even like this, still need consider following steps.In this process, to encode and to disturb HIV (Human Immunodeficiency Viruses) to duplicate or the gene (for example antisensenucleic acids or ribozyme) of the nucleic acid molecules of gene expression imports in the T cell (cause of disease of acquired immune deficiency syndrome (AIDS)) that has infected HIV [as J.Virol., 69:4045-4052 (1995)].

As above-mentioned detailed description, use the present invention and can and import target cell with high specificity the gene efficient rate.In addition, described method of the present invention does not need special equipment or instrument and all effective to different retroviral vectors and target cell.

Embodiment

Following examples have been illustrated the present invention in more detail, but the scope that can not be construed as limiting the invention.

Embodiment 1

Prepare polypeptide from fibronectin

According to United States Patent (USP) the 5th, 198, No. 423 described methods, preparation derives from a peptide species H-271 of people's fibronectin from the escherichia coli HB101/pHD101 (FERM BP-2264) that contains recombiant plasmid pHD101, and described recombiant plasmid contains the DNA of coding said polypeptide.

Method according to above-mentioned publication description, preparation derives from a peptide species H-296 of people's fibronectin from the escherichia coli HB101/pHD102 (FERM P-10721) that contains the pHD102 recombiant plasmid, and described recombiant plasmid contains the DNA of coding said polypeptide.

Prepare peptide C H-271 by the following method.

In brief, cultivate escherichia coli HB101/pCH101 (FERMBP-2799), from this culture, obtain CH-271 according to the method that above-mentioned publication is described.

Prepare peptide C H-296 by the following method.

In brief, the method for describing according to above-mentioned publication is cultivated escherichia coli HB101/pCH102 (FERM BP-2800).From this culture, obtain CH-296.

Prepare peptide C-274 by the following method.

Briefly, according to U.S. Patent number 5,102,988 described methods are cultivated e. coli jm109/pTF7221 (FERM BP-1915), obtain C-274 from this culture.

The method of describing according to WO97/18318 prepares having in conjunction with the active polypeptide of retrovirus from collagen type v albumen, ColV derivation.

Embodiment 2

The preparation of Expressed by Retrovirus Vector and retrovirus supernatant

With retroviral plasmid, promptly contain the PM5neo carrier [Exp.Hematol., 23:630-638 (1995)] of neomycin phosphotransferase gene, import GP+E-86 cell (ATCCCRL-9642).With cell culture in containing 10% hyclone (FCS; Gibco), the Eagle culture medium (DMEM of the Dulbecco of 50IU/ml penicillin and 50 μ g/ml streptomycins (both all derive from Gibco) improvement; Bio Whittaker) in.All DMEM that use in following process all contain the above-mentioned antibiotics of mentioning.The supernatant that contains PM5neo virus prepares by following process: when long when partly merging in the culture dish that is coated with gelatin (IwackiGlass) of above-mentioned viral cellulation at 10-cm, add the DMEM culture medium that 4ml contains 10%FCS, overnight incubation, collection supernatant.With the culture supernatant of collecting like this with 0.45 micron filter membrane (Millipore) filtration to prepare the stock solution of viral supernatant, it is standby in-80 ℃ of preservations.

According to above-mentioned steps, the viral supernatant of preparation from following cell.Retroviral plasmid pLEIN (Clontech) the importing close preferendum incasing cells BOSC23[Proc.Natl.Acad.Sci.USA wherein that will contain neomycin phosphotransferase gene and enhanced green fluorescent protein (EGFP) gene, 90:8392-8396 (1993)] and two preferendum incasing cells  CRIP[Proc.Natl.Acad.Sci.USA, 85:6460-6464 (1988)].Hereinafter, the virus that will prepare from the BOSC23 cell is called Eco-EGFP respectively, and the virus for preparing from  CRIP cell is called Ampho-EGFP.

In addition, according to above-mentioned steps, from containing GP+Env Am12 (ATCC CRL-9641) the cell preparation virus supernatant of retroviral plasmid TKNeo carrier [J.Exp.Med., 178:529-536 (1993)] (this carrier contains neomycin phosphotransferase gene).Application contains the DMEM culture medium that 10% calf serum (CS is available from Gibco) substitutes 10%FCS.

Measure the titre [J.Virol., 62:1120-1124 (1988)] of viral supernatant according to the method for standard, this method is used neomycin phosphotransferase gene and is imported the efficient of MH/3T3 cell (ATCCCRL-1658) as index.Calculate the number (cfu/ml) of the infecting virus particle that contains in every milliliter of supernatant.At this value of calculation is on the basis of described supernatant titre, the amount of the viral supernatant that decision need add in hereinafter testing.

Embodiment 3

Have preparation and determination of activity thereof in conjunction with the active functional materials of retrovirus

Adding 50 μ l contain 80 μ g/ml H-271, H-296, C-274, CH-271, CH-296, CoIV, people's alkali fibroblast growth factor (bFGF in without each hole of 96 holes of any processing trace Tissue Culture Plates (Falcon); Progen), tenascin (Gibco) or epidermal growth factor (EGF; 2% bSA of solution Takara Shuzo) or 50 μ l (BSA, Sigma).Place 4 ℃ to spend the night described culture plate, use phosphate buffer (PBS, Roman Kogyo) washed twice then.As selection, after described plate handled as stated above, every hole added 1-ethyl-3-dimethylamino-propyl carbodiimide hydrochloride (Sigma) solution of 0.1ml with the 4mg/ml of sterile pure water preparation.Make it 37 ℃ of reactions 2 hours.Described plate is thoroughly washed the plate of handling through carbodiimides to be prepared into pure water.These plates are placed 4 ℃, up to carrying out the viral infection experiment.

To grow in and contain 10%FCS, 50IU/ml penicillin, 10 in the RPMI1640 culture medium of 50 μ g/ml streptomycins (Bio Whittaker) ⁴Mouse leukemia L1210 cell (ATCCCCL-219) and 50 μ lPM5neo virus supernatant (10 ⁴Cfu/ml) add in the hole of described microtest plate.Cultivate after 24 hours, change culture medium into contain the G418 that final concentration is 0.75mg/ml (Gibco) same medium, then this plate was cultivated 48 hours again.The method that [Gene Therapy, the 3:1018-1020 (1996)] such as S.Kim that revises according to part describes is measured the G418 resisting cell, measures the absorbance of 450nm in the described method with Premix WST-1 reagent (Takara Shuzo) colour developing back.After the cultivation, will WST-1 reagent be joined in the hole, this plate is continued to cultivate 4 hours at 37 ℃ by 10 μ l/100 μ l culture fluid.Measure the absorbance of 450nm and 650nm with the micro plate reading apparatus, and calculate the difference of (450nm-650nm) between described absorbance.Will available from 2%BSA bag by but the value of the plate handled without carbodiimides as background.Table 1 is the summary of three experimental results.

Table 1

	Functional materials	Unprocessed	Handle with carbodiimides
				Experiment 1	BSA	0.000±0.01 1	Do not do
	CH-271	2.099±0.010	2.814±0.079
				Experiment 2	BSA	0.000±0.007	0.224±0.031
	H-271	0.777±0.016	0.994±0.029
					H-296	0.474±0.014	0.666±0.021
	C-274	-0.068±0.017	0.100±0.033
					CH-271	0.382±0.017	0.425±0.019
	CH-296	0.363±0.023	0.460±0.007
					CoIV	0.644±0.006	0.847±0.033
	bFGF	0.425±0.014	0.5 80±0.046
					Tenascin	0.060±0.021	0.323±0.037
	EGF	0.030±0.021	0.077±0.038

(mean ± standard deviation)

As shown in table 1, observing the known functional materials that has in conjunction with virus activity can increase gene importing efficient, for example H-271, H-296, CH-271, CH-296, ColV and bFGF.In addition, when the material that use not to have in conjunction with virus activity, as C-274, tenascin, EGF and BSA, and when handling with carbodiimides, the appearance of G418 resisting cell increases.

Next step, CH-296 is experimentized as follows as functional materials:

The 40 μ g/ml CH-296 of 0.5ml are joined in each hole of undressed 24 orifice plates (Falcon) that are used for cell culture.Place 4 ℃ to spend the night described plate, use PBS (pH 5.8) washing then.In every hole, add the 1 [(NH for preparing and contain variable concentrations with PBS (pH 5.8) ₂(CH ₂) ₂NH ₂Nacalai Tesque], 1,3-propane diamine [(NH ₂(CH ₂) ₃NH ₂Nacalai Tesque], putrescine [(NH ₂(CH ₂) ₄NH ₂NacalaiTesque] 1-ethyl-3-dimethylamino-propyl carbodiimide hydrochloride (Sigma) 625 μ l. of 10mg/ml described plate was hatched 2 hours in 37 ℃.In this process,, amino is imported in the carboxyl of CH-296 molecule through the mediation of carbodiimides.Wash this plate 3 times with PBS, use 2% glycine/PBS, reuse 2%BSA/PBS to seal then.

The GP+E86 cell culture that importing is had retroviral vector plasmid pLEIN is in the DMEM culture medium that contains 10%CS.From culture, collect supernatant then.This supernatant dilution is prepared into 1 * 10 ⁵The supernatant of the concentration of cfu/ml, getting 0.5ml should join in each hole of described plate by the virus supernatant.This plate was hatched 4 hours.In the hole, add 1 * 10 then ⁴The NIH/3T3 cell.This plate was cultivated 2 days again.After the cultivation, with cell separation (detachment) buffer (Bio Whittaker) collecting cell and washing.Is 488nm with FACSVantage (BectonDickinson) flow cytometer at excitation wavelength, and wavelength of transmitted light is measured the EGFP-express cell during for 515-545nm.Import efficient with gene and represent that virus is attached to the ability on the culture plate.The results are shown in Fig. 2.

As shown in Figure 2, the concentration increase along with being used to import amino diamino compounds also increases in conjunction with viral ability.With with the observed adhesion of undressed CH-296 relatively, when putrescine, 1, when 3-propane diamine or the 1 application concentration in reaction was 2mM, can be observed described viral adhesion had increased by 2 times.

Embodiment 4

Laminin imports the influence of efficient to promoting gene

With the laminin (Gibco) of mice or human laminin (Takara Shuzo) with have the functional materials use in conjunction that combines virus activity and import experiment to carry out gene.The undressed 24 porocyte culture plates (Falcon) that are used to test are pressed following two kinds of method bags by these functional materials.

Cocktail: the mixture of two kinds of functional materials is added in the described plate.Place 4 ℃ to spend the night this plate.Hatch at 37 ℃ with 2%BSA and to seal this plate in 20 minutes, wash with PBS then.

Wrap in advance by method: in described plate, add the solution that has in conjunction with the functional materials of virus activity, place 4 ℃ to spend the night this plate.Remove solution.In this plate, add laminin solution again.This plate was hatched 2 hours at 37 ℃,, wash with PBS then with the 2%BSA sealing.

With the described functional materials solution of 0.5ml bag by each hole.

In each hole, add 10 ⁵The Eco-EGFP virus supernatant (10 of L1210 cell and 0.5ml ⁵Cfu/ml).This plate was hatched 24 hours.After hatching, collect and washed cell with cell separation buffer (BioWhittaker).Is 488nm with FACSVantage (Becton Dickinson) flow cytometer at excitation wavelength, and wavelength of transmitted light is analyzed the EGFP-express cell during for 515-545nm.Calculate gene and import efficient (ratio of EGFP-express cell and total cell).Experimental result is shown in table 2-5.

Table 2

Gene imports efficient and represents with %.

Table 3

According to the cocktail bag by culture plate.Gene imports efficient and represents with %.

Table 4

According to the cocktail bag by culture plate.Gene imports efficient and represents with %.

Table 5

According to the cocktail bag by culture plate.Gene imports efficient and represents with %.

Shown in table 2 and table 3, originally experimental results show that, with the laminin of people or mice with have combine virus activity the functional materials use in conjunction when the gene that carries out with retrovirus imports, no matter whether use fixation, all can very effectively gene be imported target cell.Measured with CH-296 or CH-271 and laminin and imported efficient by the gene of the culture plate of cocktail bag quilt.10 μ g/ml) and 16: 1 (80 μ g/ml for example: 5 μ g/ml) table 4 and table 5 show, when CH-296/ mice laminin or CH-271/ mice laminin use in conjunction, its optimal proportion is respectively 8: 1 (80 μ g/ml for example:.Import efficient with the gene that does not add laminin and compare, the gene of CH-296 and CH-271 imports efficient has increased by 2.6 times and 5.1 times respectively.

Embodiment 5

The application layer Fibronectin imports gene in the male medullary cell of mice c-kit

The male medullary cell of mice c-kit prepares as follows.Get 6-8 week C3H/He female mice in age (Japan SLC), (1.0875g/ml Pharmacia) carries out density gradient centrifugation and contains low-density monocytic part with preparation the medullary cell that will collect from femur with Ficoll-Hypaque.Wash this cell with PBS, with erythrocyte splitting buffer (155mMNH ₄Cl, 10mM KHCO ₃, 0.1mM EDTA, pH7.4) lysed erythrocyte, reuse PBS washs this cell.By 1 μ g/10 ⁷Cell will resist Mus CD117 antibody (Pharmingen) to add in the medullary cell that obtains.This mixture was reacted on ice 30 minutes.Wash described cell with the PBS that contains 5mM EDTA and 0.5%BSA, be suspended in then in the identical buffer.By 20 μ l/10 ⁷The second antibody (Miltenyi Biotec) that cell will be combined on the microballon adds in this cell.Described mixture was reacted 30 minutes in 4 ℃.With the above-mentioned buffer of the mentioning described cell that washs and suspend.Collect the cell be attached on the described microballon to obtain the c-kit-positive cell with MACS system (Miltenyi Biotec).

Before viral infection, stimulate the positive medullary cell of described mice c-kit-in advance according to described methods such as Luskey [Blood, 80:396-402 (1992)].In brief, with cell culture in the α-MEM (BioWhittaker) that contains 20%FCS, 20ng/ml recombined small-mouse interleukin-3 (Genzyme), 50ng/ml recombination human interleukin-6 (Genzyme), 100ng/ml recombined small-mouse stem cell factor (Genzyme), 50 units/ml penicillin and 50 μ g/ml streptomycins, at 5%CO ₂Exist down, cultivated 2 days in 37 ℃.

With the mixture of the CH-271 of the mice laminin of variable concentrations and 80 μ g/ml by the cocktail bag by undressed 24 holes trace Tissue Culture Plate.This plate with 2%BSA sealing 30 minutes, is washed with PBS then, and H-271 prepares control board with the 2%BSA replaced C.In each hole of this micro plate, add 10 ⁵Male medullary cell of c-kit and the Eco-EGFP of 0.5ml virus supernatant (10 ⁵Cfu/ml) carry out viral infection.After hatching 48 hours, in each hole, add the 0.5ml fresh culture, this plate was incubated the region between the heart and the diaphragm 24 hours again.After the cultivation, collect and wash this cell, press embodiment 4 described methods and calculate genes importing efficient with the cell separation buffer.Twice experimental result is shown in table 6 and table 7.

Table 6

Gene imports efficient and shows with %.

Table 7

Gene imports efficient and shows with %.

Shown in table 6 and table 7, originally experimental results show that according to cocktail to have the functional materials CH-271 in conjunction with virus activity to wrap on the culture plate of quilt with mice laminin and tool, during with the male medullary cell of retroviral infection c-kit-, also observe the effect that very strong promotion gene imports efficient.Compare with independent use CH-271, CH-271 and laminin use in conjunction can increase gene and import the most nearly 5.7 times of efficient.

In addition, be 10 with titre as stated above ⁷The Eco-EGFP virus supernatant of cfu/ml carries out identical step.The average that the gene of three experiments imports efficient is shown in table 8.The result also proves, in the time will having in conjunction with active functional materials of retrovirus and laminin use in conjunction, also increases described gene and imports efficient.

Table 8

Gene imports efficient and shows with %.

Embodiment 6

With laminin gene is imported CD-3 positive T cell available from mouse boosting cell

Prepare CD-3 positive T cell as follows available from mouse boosting cell.Spleen collecting cell from the C3H/He female mice in age in 6-8 week.This cell is removed residue by the sieve mesh (Falcon) of 100-μ m.(HBSS BioWhittaker) washs the cell of gained, and with erythrocytolysis buffer lysed erythrocyte, washs described cell once more with HBSS with the Hanks ' balanced salt solution that contains 10%FCS.The cell that obtains is removed residue by the sieve mesh (MiltenyiBiotec) of 30-μ m, and reuse pillar purification concentrates CD3-positive T cell (R﹠amp; D system).The pre-as follows mice CD3-positive T cell that is used for the viral infection experiment that stimulates.To be used for pre-stimulated cells is incubated at and is fixed with anti-Mus CD3 antibody and anti-Mus CD28 antibody (two kinds are 1 μ g/ml, in Petri culture dish Pharmingen).Contain the penicillin that is added with 10%FCS, 50 units/ml and the RPMI1640 culture medium (Bio Whittaker) of 50 μ g/ml streptomycins in this Petri culture dish.With described cell in 37 ℃, 5%CO ₂Under cultivated 2 days.

As described in embodiment 5, with the mixture bag of the CH-296 that contains the mice laminin of 20 μ g/ml and 80 μ g/ml by 24 well culture plates.In each hole of this microtest plate, add 10 ⁵The Eco-EGFP virus supernatant (10 of CD3-positive T cell and 0.5ml ⁵Cfu/ml) carried out viral infection 3 hours.The recombined small-mouse interleukin II (Genzyme), the penicillin of 50 units/ml and RPMI 1640 culture medium of 50 μ g/ml streptomycins that add interleukin-1 α (Genzyme), the 10ng/ml of the recombined small-mouse that contains 10%FCS, 500 units/ml in addition again.Continue to cultivate 48 hours.After the cultivation, collect and washed cell with the cell separation buffer.Press embodiment 4 described methods and calculate gene importing efficient.The results are shown in table 9.

Table 9

Functional materials	Import efficient (%)
		BSA (contrast)	0.83
CH-296	8.78
		CH-296/ mice laminin	13.20

Gene imports efficient and shows with %.

As shown in table 9, originally experimental results show that common existence owing to laminin, the efficient that gene imports to mice CD3-positive T cell increases.

Embodiment 7

The participation of the sugar chain of laminin molecule during gene imports

As described in embodiment 5, by 50 μ l/ holes with the mixture bag of the CH-271 that contains the mice laminin of 5 μ g/ml and 80 μ g/ml by 96 holes trace Tissue Culture Plate.Handle culture plate with different organized enzymes, observe the influence that gene is imported efficient with cutting sugar chain.

Handle culture plate with following enzyme: be formulated in the citric acid phosphoric acid buffer (pH5.0) of 50mM and contain 500mU/ml O-dextranase (inscribe-alpha-N-Acetylgalactosaminidase, Seikagaku Corp.), the enzymatic solution of the alpha-Mannosidase (Seikagaku Corp.) of the endoglycosidase H of 500mU/ml (endo-beta-N-acetyl glucosaminidase H, Seikagaku Corp.), 250mU/ml inscribe-beta galactosidase (Seikagaku Corp.) and 2mU/ml.Be formulated in the enzymatic solution that contains 250mU/ml glycopeptidase F (peptide: N-glycosidase F, Takara Shuzo) in the 100mMTris-HCl buffer (pH8.6).In each hole, add each 50 μ l of enzymatic solution, in 37 ℃ of reactions 20 hours.Wash described culture plate three times with PBS then and use it for the viral infection experiment.

In each hole of described micro plate, add 10 ⁴Grow in mouse leukemia cell L1210 and 50 μ lPM5neo virus supernatant (10 in RPMI 1640 culture medium of the penicillin that contains 10%FCS, 50 units/ml and 50 μ g/ml streptomycins ⁴Cfu/ml).This plate was cultivated 24 hours.Culture medium changed into contain the identical culture medium that final concentration is 0.75mg/ml G418 (Gibco).This plate was cultivated 48 hours again.Press embodiment 3 described methods and estimate the G418 resisting cell.The results are shown in table 10.Table 10 is summaries of 3 groups of experimental results.

Table 10

Functional materials	Enzyme is handled	Absorbance
			BSA (2%, contrast)	Do not have	0.000±0.030
CH-271(80μg/ml)	Do not have	1.376±0.012
			CH-271/ laminin (80 μ g/ml: 5 μ g/ml)	Do not have	1.7g1±0.062
The CH-271/ laminin	The O-dextranase	1.886±0.071

(80μg/ml∶5μg/ml)
			CH-271/ laminin (80 μ g/ml: 5 μ g/ml)	Endoglycosidase H	1.214±0.017
CH-271/ laminin (80 μ g/ml: 5 μ g/ml)	The E-beta galactosidase	1.939±0.083
			CH-271/ laminin (80 μ g/ml: 5 μ g/ml)	Alpha-Mannosidase	1.657±0.033
CH-271/ laminin (80 μ g/ml: 5 μ g/ml)	Glycopeptidase F	1.610±0.036

As shown in table 10, compare with independent use CH-271, when uniting use CH-271 and laminin, the appearance of G418 resisting cell increases.With the culture plate of endoglycosidase H processing, can remove the effect of the promotion gene importing of laminin fully with laminin bag quilt.In addition, handle described culture plate, also lower gene to a certain extent and import efficient with alpha-Mannosidase or glycopeptidase F.According to the report [Biochim.Biophysi.Acta, 883:112-126 (1986)] about the sugar chain of laminin molecule, the sugar chain of most laminin molecule is and the bonded N-connection of agedoite sugar chain.There is the N-connection sugar chain of 43 molecules to combine with the laminin molecule.In these sugar chains, handle the agedoite-N-that can discharge high mannose type with endoglycosidase H and join sugar chain.The sugar chain of handling the fact prompting laminin molecule of also observing the attenuating of gene importing efficient with alpha-Mannosidase plays an important role.This sugar chain has can be by the structure of the cracked α of containing 1-2-of α mannosidase and/or α 1-6-bonding mannose, with (mannose) ₉-(GlucNAc) ₂-Asn and/or (mannose) ₆-(GlucNAc) ₂-Asn represents.As mentioned above, experimental results show that originally the effect that laminin promotes gene to import is because the sugar chain of the effect, particularly high mannose type of the sugar chain of laminin molecule.

Following experiment confirm (mannose) ₉-(GlucNAc) ₂-Asn participates in the process that gene imports.

To contain 10mMCaCl with being dissolved in 20ml then with the soybean agglutinin 1 gram thermal denaturation of Sepharose CL-2B (Pharmacia) preparation that is fixed with lactose from degreasant Semen sojae atricolor powder (Sigma) ₂50mM Tris-HCl buffer (pH7.2) in actin enzyme E (ActinaseE, Kaken Pharmaceutical) 20mg in 37 ℃ digestion 2 days.With heat with enzyme-deactivating after, with the chromatography purification (mannose) to the chromatographic column of Sephadex G-15 (50ml) post and Sephadex G-25 (150ml) of sample on the described mixture ₉-(GlucNAc) ₂-Asn.Figure 1 shows that (mannose) of having removed asparagine residue ₉-(GlucNAc) ₂The structure of-Asn.

Preparation is fixed with CH-271 and (mannose) through covalent bonds ₉-(GlucNAc) ₂The microtest plate of-Asn.In brief, with 4mg/ml water miscible carbodiimides solution in 37 ℃ of carbon class culture plates (ELISA Carbo-type plate) that activate 96 holes (SumitomoBakelite) 2 hours, then with sterilized water washing 3 times.The 2%BSA or the CH-271 of 80 μ g/ml and (mannose) of variable concentrations that in each hole, add 50 μ l through activating the 96 hole carbon class culture plates of handling ₉-(GlucNAc) ₂Each solution of-Asn.This plate was reacted 2 hours in 37 ℃ of immobilizations.Glycine solution with 0.2% is used for following gene then and imports experiment in 4 ℃ of sealing this plates 15 hours.

In each hole of described micro plate, add 10 ³L1210 cell and 0.1ml Eco-EGFP virus supernatant (10 ⁶Cfu/ml).This plate cultivation after 48 hours, is added fresh RPMI 1640 culture medium that 0.1ml contains FCS, penicillin and streptomycin in each hole, this plate is continued to cultivate 24 hours.Collect and wash described cell.Press embodiment 4 described methods and calculate gene importing efficient.The average result of twice independent experiment is shown in table 11.

Table 11

Gene imports efficient and shows with %.

As shown in table 11, be fixed with (mannose) ₉-(GlucNAc) ₂In the hole of the described plate of-Asn and CH-271, the increase of gene importing efficient depends on the concentration of used sugar chain.Therefore, the gene that confirm to increase imports efficient owing to the sugar chain that has with laminin molecule same structure.

Embodiment 8

The specific gene that anti-CD4 monoclonal antibody is used for the CD4-positive cell imports

As described in embodiment 4, the anti-mice CD4 monoclonal antibody of 1 μ g/ml or H-271, CH-271 or the CH-296 of anti-mice CD44 monoclonal antibody (both all derive from Pharmingen) and 80 μ g/ml are wrapped together by undressed 24 holes trace Tissue Culture Plate.Carry out the bag quilt of H-271 according to pre-method for coating, and carry out the bag quilt of CH-271 and CH-296 according to cocktail.

In each hole of this micro plate, add 0.5ml Eco-EGFP virus supernatant (10 ⁷Cfu/ml).This plate was hatched 3 hours in 32 ℃, then with the RPMI 1640 culture medium washing of the penicillin that contains 10%FCS, 50 units/ml, 50 μ g/ml streptomycins.Pressing embodiment 6 described method preparations stimulates from the deutero-CD3-positive T cell of mouse boosting cell and through pre-, with 10 ⁵This cell joins and carried out viral infection in the described hole 3 hours.Then, RPMI 1640 culture medium that in this hole, add the recombined small-mouse il-1 α, 10ng/ml recombined small-mouse interleukin-2,50 units/ml penicillin and the 50 μ g/ml streptomycins that contain 10%FCS, 500 units.This plate is continued to cultivate 48 hours.After the cultivation, collect and wash described cell with the cell separation buffer, then be marked with phycoerythrin (PE, Pharmingen) and propiniumiodide (PI, anti-mice CD4 monoclonal antibody (Pharmingen) Sigma) dyes.To flow cytometer, is that 488nm and wavelength of transmitted light are the expression that 515-545nm or 562-588nm two-phase are analyzed T4 antigen and EGFP in the living cells with FACSVantage at excitation wavelength with sample on these cells.Calculate CD4-gene positive and the CD-4 negative cells and import efficient.The results are shown in table 12.Table 12 is summaries of four experiments.

Table 12

Functional materials	Import the efficient (%) of CD4-positive cell	Import the efficient (%) of CD4-negative cells
			BSA (contrast)	0.16±0.07	0.11±0.07
Anti-CD 4 antibodies	0.24±0.19	0.12±0.04
			Anti-CD44 antibody	1.92±0.82	1.95±1.00
H-271	31.02±7.34	16.54±4.30
			Anti-CD 4 antibodies/H-271	58.91±8.11	20.32±4.46
Anti-CD44 antibody/H-271	56.08±7.53	40.96±7.04
			CH-271	44.63±6.40	26.21±5.73
Anti-CD 4 antibodies/CH-271	64.81±9.74	25.97±1.25
			Anti-CD44 antibody/CH-271	60.29±8.71	44.10±3.56
CH-296	48.81±8.77	29.45±4.70
			Anti-CD 4 antibodies/CH-296	62.93±6.45	30.84±3.27
Anti-CD44 antibody/CH-296	56.79±9.87	41.37±1.14

(mean ± standard deviation)

As shown in table 12, when carrying out retroviral infections with the culture plate that is coated with monoclonal antibody and CH-296, the gene of observing the CD3-positive T cell that derives from mouse boosting cell imports the effect of efficient increase.

Should be noted that especially when anti-CD4 monoclonal antibody with have the active functional materials of the retrovirus of combination and unite and use when carrying out viral infection, the efficiency far that gene imports the CD4 positive cell is higher than the efficient that imports the CD4 negative cells.For example, when anti-CD4 monoclonal antibody and H-271 use in conjunction, gene imports the efficient very high (being approximately 60%) of CD4 positive cell, and described gene imports the efficient only about 20% of CD4 negative cells.When CH-271 or CH-296 are used as CH-296, observe similar result.

On the other hand, the positive of the CD4 more than 98% and CD4 negative cells are all expressed CD44 antigen.Therefore, prediction will be in the time will resisting the CD44 monoclonal antibody to be used for retroviral infection as mentioned above, no matter whether described cell expresses T4 antigen, gene imports efficient all will be increased.The result of table 12 has confirmed this prediction.

Embodiment 9

The specific gene that anti-CD8a monoclonal antibody is used for the CD8 positive cell imports

Have in conjunction with the active functional materials of retrovirus except H-271 is used as, and will resist mice CD8a monoclonal antibody (Pharmingen) and anti-mice CD44 monoclonal antibody, experimentize by embodiment 8 described methods as outside the antibody.To be marked with phycoerythrin (PE; Pharmingen) anti-mice CD8a monoclonal antibody (Pharmingen) is used to detect the positive and CD8 negative cells of CD8.The results are shown in table 13.Table 13 is summaries of twice experimental result.

Table 13

Functional materials	Gene imports the efficient (%) of CD8 positive cell	Gene imports the efficient (%) of CD8 negative cells
			BSA (contrast)	0.22±0.08	0.28±0.00
Anti-CD8a antibody	0.36±0.20	0.28±0.02
			Anti-CD44 antibody	0.98±0.34	0.92±0.20
H-271	20.08±4.71	26.43±6.07
			Anti-CD8a antibody/H-271	36.07±1.57	24.42±0.55
Anti-CD44 antibody/H-271	46.93±0.88	47.16±0.75

(mean ± standard deviation)

As shown in table 13, when anti-CD8a monoclonal antibody and CH-296 use in conjunction, the gene of observing the CD3-positive T cell that derives from mouse boosting cell imports the effect that efficient increases.

As observed among the embodiment 8, when using anti-CD8a monoclonal antibody, observe expression and imported efficient by the high gene of the CD8 antigen presentation cell of this antibody recognition.On the other hand, when with anti-CD44 monoclonal antibody (CD8 more than 98% positive and CD8 negative cells all express CD44), between these two kinds of cells, do not find the difference of gene importing efficient.

Embodiment 8 and 9 experimental result are highly significant, if these results confirm but specificity is wrapped by culture vessel in conjunction with antibody of described target cell and the mixture (cocktail sample) that has in conjunction with the functional materials of virus activity, when containing the cell colony of target cell in the retroviral infection culture vessel that contains genes of interest, genes of interest can be imported in this target cell specifically.

Embodiment 10

Utilize the cell-specific gene of antibody to import

As described in embodiment 4, wrap by undressed 24 holes trace Tissue Culture Plate with the CH-271 of 80 μ g/ml and the monoclonal antibody (antibody of anti-CD4, anti-CD8, anti-CD44, anti-CD49c, anti-CD49d and anti-CD49e is all from Pharmingen) of 1 μ g/ml anti-different cell surface antigens according to the cocktail method.

With K562 (people's chronic myelogenous leukemia cell, ATCC CCL-243), HSB-2 (people's acute lymphoblastic leukemia cell, CCRF-HSB-2, ATCC CCL-120.1), MOLT-3 (people's acute lymphoblastic leukemia cell, ATCC CRL-1552) and TF-1 (human erythroleukemia cell, ATCC CRL-2003), these cells is carried out flow cytometry analysis to measure the antigen presentation of corresponding antibodies with the monoclonal antibody separately of labelling as target cell.

The Ampho-EGFP virus supernatant (1 * 10 that in each hole of described micro plate, adds 0.5ml ⁶Cfu/ml).This plate in 32 ℃ of cultivations 3 hours, is washed with RPMI 1640 culture medium that contain 10%FCS, 50 units/ml penicillin and 50 μ g/ml streptomycins then.In each hole, add and be suspended in 1 * 10 in the 1ml culture medium ⁵The cell that has nothing in common with each other carries out viral infection.Continue to cultivate after 3 days, collect and wash this cell, press embodiment 4 described methods with fluidic cell method calculating EGFP gene importing efficient with the cell separation buffer.

The results are shown in table 14, result displayed is the meansigma methods of three independent experiments.

Table 14

It is 100% that the gene of supposing not add the corresponding cell of antibody imports efficient, and the gene that adds antibody imports efficient and represents with relative value %.

The ratio (%) of positive cell when on behalf of FACS, T cell differentiation antigen expression ratio (CD ag exp.Ratio) measure, as follows:

-: 10% or still less; +/-: 10-30%; +: 30-60%; ++: 60-90%;

+++: 90% or higher.

As shown in table 14, when with cocktail method with CH-271 as viral bound substances and with the antigenic antibody on the anti-cell during as the cell bound substances, it is relevant that antigen presentation efficient and gene import efficient.

In addition, carry out gene importing experiment with the alternative CH-271 of the polylysine of 80 μ g/ml as having in conjunction with the active functional materials of retrovirus.Used monoclonal antibody, cell and other experiment condition are as previously discussed.The results are shown in table 15, demonstration be the average result of three independent experiments.

Table 15

It is 100% that the corresponding cytogene of supposing to add antibody imports efficient, and the gene that adds antibody imports efficient and represents with relative value (%).

The ratio (%) of positive cell when on behalf of FACS, T cell differentiation antigen expression ratio (CD ag exp.Ratio) measure, as follows:

-: 10% or still less; +/-: 10-30%; +: 30-60%; ++: 60-90%; +++: 90% or higher.

As shown in Table 15, when with cocktail method with polylysine as viral bound substances and with the antigenic antibody on the anti-cell during as the cell bound substances, it is relevant that antigen presentation rate and gene import efficient.

Above-mentioned two groups of experimental results prove, according to the cocktail method, but the antigenic antibody that the specific recognition target cell is expressed can import gene specific ground importing purpose target cell by gene as the cell bound substances.

Embodiment 11

Gene is imported pre-incubated target cell in containing the culture medium of deferoxamine

To be transformed in the same medium that contains variable concentrations deferoxamine (Sigma) the previous day at infection experiment with people's myelocytic leukemia HL-60 cell (ATCC CCL-240) of the RPMI1640 culture medium culturing that contains 10%FCS, 50 units/ml penicillin and 50 μ g/ml streptomycins.With described cell in 37 ℃, 5%CO ₂Exist down and cultivated 20 hours.Wash this cell with the fresh culture that does not contain deferoxamine during use, then by 2 * 10 ⁵The concentration suspension cell of cell/ml also is used for following infection experiment.

The CH-271 that in each hole of undressed 24 holes trace Tissue Culture Plate, adds the 80 μ g/ml of 0.5ml.Place 4 ℃ to spend the night this plate, wash with 2%BSA sealing 30 minutes and with PBS.The Ampho-EGFP virus supernatant (10 that in each hole of this micro plate, adds 0.5ml ⁶Cfu/ml).This plate was cultivated 3 hours and washed with the RPMI1640 culture medium that contains 10%FCS, 50 units/ml penicillin and 50 μ g/ml streptomycins in 32 ℃.In each hole, add 10 ⁵Individual pre-incubated HL-60 cell.This plate was cultivated 48 hours.In each hole, add RPMI 1640 culture medium that 0.5ml contains 10%FCS, 50 units/ml penicillin and 50 μ g/ml streptomycins.Continue to cultivate this plate 24 hours.Press embodiment 4 described methods then and measure gene importing efficient.The results are shown in table 16 and 17.

Table 16

The concentration of deferoxamine (μ g)	Functional materials	Gene imports efficient (%)
			Do not add	BSA (contrast)	0.01
Do not add	CH-271	0.14
			6.25	CH-271	0.22
12.5	CH-271	0.27
			25	CH-271	0.35
50	CH-271	0.71

Table 17

The concentration of deferoxamine (μ g)	Functional materials	Gene imports efficient (%)
			Do not add	BSA (contrast)	0.02
Do not add	CH-271	0.25
			40	CH-271	11.14

Shown in table 16 and table 17, use deferoxamine pretreatment HL-60 cell 20 hours, just can be observed the increase that gene imports efficient.Known independent during with CH-271 gene to import to the efficient of HL-60 cell very low.

Embodiment 12

The detection of the existence of viral infection inhibiting substances in the culture supernatant

The TKNeo virus supernatant of preparation among the embodiment 2 is used for the following step with the concentration that the culture supernatant of the culture supernatant of DMEM, NIH/3T3 cell (ATCC CRL-1658) or  CRIP cell is diluted to 312.5cfu/ml.

The CH-296 that in each hole of undressed 24 holes trace Tissue Culture Plate, adds the 32 μ g/ml of 0.5ml.This plate was placed room temperature 2 hours, wash with 2%BSA sealing 30 minutes and with PBS.In each hole of this plate, add on the above-mentioned virus of mentioning of 1ml cleer and peaceful 2 * 10 ⁴The NIH/3T3 cell.With this plate in 37 ℃ of overnight incubation.Then described cell culture was cultivated 10 days in the selective medium of the G418 that contains 0.75mg/ml.The grand number of the colony that counting forms.With G418 resistance clone number and the ratio that does not contain the clone's number that forms in the culture medium of G418 be defined as gene and import efficient.The results are shown in table 18.

Table 18

Diluent	Gene imports efficient (%)
		DMEM (contrast)	100
The NIH/3T3 cells and supernatant	20.6
		 CRIP cells and supernatant	15.7

Shown in table 18, the gene when diluting with DMEM imports efficient relatively, and when with NIH/3T3 cells and supernatant or  CRIP cells and supernatant virus dilution, described gene imports efficient and reduces to 1/5 or lower.The NIH/3T3 cell is many package cell lines, as the parental cell of  CRIP cell and GP+EmvAm12 cell, these cells can be used to produce the cellulation of the TKNeo viral vector that this experiment uses.Observe the active phenomenon prompting of inhibition retroviral infection of the culture supernatant of these cells, the viral supernatant for preparing with similar incasing cells also contains inhibitory substance.

Embodiment 13

The removal of the viral infection inhibiting substances in the virus supernatant

Following steps are used for removing the viral infection inhibiting substances that embodiment 12 finds.The TKNeo virus supernatant of preparation among the embodiment 2 is diluted to 5000cfu/ml concentration with the culture supernatant of  CRIP cell.The supernatant that has diluted is further contained retroviral sample with the DMEM doubling dilution to be used as.

As described in embodiment 11, in each hole of the culture plate that wraps quilt with CH-296, add the described viral supernatant of 1ml.This plate was hatched 1 to 5 hours, virion is contacted and combination with CH-296.Wash this plate 3 times with PBS then.In each hole, add 1ml and contain 2 * 10 ⁴The DMEM of NIH/3T3 cell.Matched group is with 2 * 10 ⁴The NIH/3T3 cell suspension is also transferred to immediately with CH-296 in the above-mentioned viral supernatant of mentioning of 1ml and is wrapped in the culture plate of quilt.These culture plates in 37 ℃ of overnight incubation, are made described virus infected cell.After the infection, with this cell with the selection culture medium culturing that contains 0.75 mg/ml G418 10 days, and the colony number that forms of counting.G418 resistance colony number and the ratio that do not contain the colony number that forms in the culture medium of G418 are defined as gene import efficient.The results are shown in Fig. 3.

As shown in Figure 3, with the importing efficient of matched group relatively, when virion contacts with CH-296 on being coated on culture plate and during in conjunction with 3 hours, observes higher gene importing efficient.Therefore proof can be removed the activity that suppresses viral infection in the viral supernatant with said method.

Embodiment 14

The removal of the sodium butyrate in the virus supernatant

Obtain the recombinant retrovirus cellulation by retroviral vector plasmid pLEIN being imported  CRIP cell, with this cell culture in the DMEM that contains 10%CS.Growing in 10 centimetres culture dish when cell reaches half when merging, and changes culture medium into 7ml and contains the RPMI 1640 of 10%FCS or the RPMI 1640 that 7ml contains 5mM sodium butyrate (Nacalai Tesque) and 10%FCS.With cell culture after 24 hours, with the membrane filtration supernatant of 0.45 μ m to obtain viral supernatant.Measure the titre of this virus supernatant by embodiment 2 described methods.The titre that does not contain the viral supernatant of sodium butyrate is 3.3 * 10 ⁴Cfu/ml, and the titre that contains the viral supernatant of 5mM sodium butyrate is 2 * 10 ⁶Cfu/ml.

Thereby sodium butyrate has the activity that suppresses cell cycle cell growth inhibiting and inducing cell differentiation.Therefore may adverse influence be arranged to the cell that infects.Be to removing the assessment of the sodium butyrate in the viral supernatant below.

With the HL-60 cell as target cell.In each hole of the culture plate that wraps quilt with CH-296, add the above-mentioned viral supernatant of mentioning of 0.5ml by embodiment 12 described methods.This plate was hatched 3 hours in 37 ℃, virion is contacted and combination with CH-296.After hatching, wash this plate 3 times, in each hole, add 0.5ml and contain 5 * 10 with PBS ⁴RPMI 1640 culture medium of the 10%FCS of HL-60 cell.Matched group is with 5 * 10 ⁴The HL-60 cell suspension also joins immediately with CH-296 in the above-mentioned viral supernatant of mentioning of 0.5ml and wraps in the culture plate of quilt.These culture plates in 37 ℃ of overnight incubation, are made described virus infected cell.After hatching, in each hole, add the RPMI that contains 10%FCS 1640 culture medium of 1ml.This plate is continued to cultivate 48 hours.Counting cells number then.In addition, detect the EGFP express cell with the flow cytometer method and import efficient according to embodiment 4 is described to analyze described gene.The results are shown in table 19.

Table 19

Experimental group/viral supernatant	Cell number (cell/plate)	Gene imports efficient (%)
			CH-296
Sodium butyrate :-	2.0×10 5	2.21
			Sodium butyrate :+	1.8×10 5	52.98
Contrast
			Sodium butyrate :-	1.7×10 5	2.74
Sodium butyrate :+	4.0×10 5	35.46

Shown in table 19, when The control group adds the viral supernatant of sodium butyrate preparation, observe higher gene and import efficient, confirmed the effect of sodium butyrate in the viral preparation.1/4 when yet the number of living cells has only with the supernatant that do not contain sodium butyrate when observing with the described supernatant that contains sodium butyrate or still less confirms the sodium butyrate cell growth inhibiting.On the other hand, in advance virion is contacted and combination with CH-296 on being coated on culture plate, do not observe the cell growth and suppressed, and this phenomenon sees the matched group of using the supernatant that contains sodium butyrate.Observe the increase that gene imports efficient, rather than reduce.Therefore proof by virus and washing after CH-296 contacts, has been got rid of the influence of sodium butyrate, can realize high gene importing efficient.

Carry out similar experiment with the DEAE-glucosan below.

The concentration of DEAE-glucosan (Sigma) by 10mg/ml is dissolved among the PBS.With this solution with 0.22 μ m membrane filtration sterilization and use it for bag by culture plate.Add the mixture of 1.1ml in each hole of undressed 6 porocyte culture plates (Iwaki Glass), this mixture passes through the PBS of 10 volumes and the DEAE-dextran solution mixing gained of 1 volume.With this plate in 4 ℃ of overnight incubation.Remove the DEAE-dextran solution of cultivating in the plate hole.The 2%BSA solution-treated 30 minutes that in each hole, adds 2ml.PBS with the 2ml/ hole washs this plate 3 times.Matched group substitutes the DEAE-dextran solution except that using PBS, prepares culture plate by same steps as.

By the method for above-mentioned adding sodium butyrate, use the recombinant retrovirus cellulation that obtains by retroviral vector plasmid pLEIN is imported GP+E86 cell [J.Virol., 62:1120-1124 (1988)] and prepare viral supernatant.The viral dilution liquid (1.6 * 10 that in each hole, adds 1ml ⁶Cfu/ml), this diluent dilutes the described viral supernatant of 1 volume by the DMEM that contains 10%CS with 20 volumes and obtains.In 37 ℃ of cultivations 2 hours, the PBS with the 2ml/ hole washed this plate 3 times then with this plate.In each hole, add 5 * 10 ⁴The NIH/3T3 cell.With this plate in 37 ℃, 5%CO ₂Exist down and cultivated 3 days.After the cultivation, with trypsin treatment and collect described cell.Press the embodiment 4 described flow cytometer methods of using and analyze the EGFP express cell to measure gene importing efficient.The results are shown in table 20.

Table 20

The bag quilt	Gene imports efficient (%)
		The DEAE-glucosan	26.7
Contrast	0.7

It is to represent with the EGFP positive cell and the ratio (%) of total cell number that gene imports efficient.

Shown in table 20, prove that the DEAE-glucosan has equally in conjunction with retroviral activity, and can use it for method of gene introduction of the present invention.

Embodiment 15

Using centrifuging makes functional materials combine with retrovirus

The  CRIP cell culture that will import the retroviral plasmid DOL carrier that contains neomycin resistance gene [Proc.Natl.Acad.Sci.USA, 84:2150-2154 (1987)] is in the DMEM that contains 10%CS, 50 units/ml penicillin and 50 μ g/ml streptomycins.Prepare DOL virus supernatant as follows.Growing in 10 centimetres culture dish when described viral cellulation reaches half when merging, and culture medium is changed into the DMEM culture medium that contains 10%CS of 5ml.Cultivate after 24 hours, collect supernatant and also filter this supernatant with the filter membrane (Millipore) of 0.45 μ m.The titre of described viral supernatant is 8.7 * 10 ⁵Cfu/ml.

(50ml polypropylene conical tube Falcon) wraps quilt with CH-296 as follows to be used for the centrifuge tube of retroviral infection cell.In brief, the bottom that the PBS that contains 40 μ g/mlCH-296 of 3ml is added at leisure this centrifuge tube.Should manage and vertically be positioned over 4 ℃ of cultivations 16 hours.Change CH-296 solution into PBS that 3.5ml contains 2%BSA.This pipe placed continued to hatch under the room temperature 30 minutes, use Hanks ' balanced salt solution (HBSS, Gibco) washing of 5ml then.

Make the DOL retrovirus be attached to the bottom of the centrifuge tube that is coated with CH-296 as follows.In brief, the DOL virus supernatant of the not diluted of 5ml or its 10 times or its diluent of 100 times are added in the described centrifuge tube.Should manage 3 hours so that 2900 * g is centrifugal in 25 ℃, and force described retrovirus to combine with CH-296.In contrast, the above-mentioned viral supernatant of mentioning is joined with the PBS that contains 40 μ g/ml CH-296 carry out forming 8 μ g/cm in the undressed 6 porocyte culture plates (Falcon) of CH-296 bag quilt ²Density.With this plate place 37 ℃ 4 hours so that in conjunction with and use it for following step.

With the centrifuge tube that is coated with CH-296, and retrovirus is incorporated into CH-296 by force, gene is imported the NIH/3T3 cell by centrifugal.In brief, with 1 * 10 ⁵The NIH/3T3 cell joins in the centrifuge tube with CH-296 bag quilt, and a kind of in the serial dilutions of the described viral supernatant of centrifugal mistake arranged in this centrifuge tube.This pipe is hatched 3 hours (to call centrifuging in the following text) in 37 ℃.As selection, the above-mentioned micro plate of mentioning is hatched (after this claiming combined techniques) under the same conditions.Matched group adds the mixture of cleer and peaceful NIH/3T3 cell on the described virus in the micro plate with CH-296 bag quilt, and this plate was hatched 3 hours in 37 ℃.The result who uses a kind of method gained in back is defined as the result who uses traditional method gained that infects, and used as contrast (deserving to be called therapy for clearing away heat herein).After hatching, collecting cell.Press embodiment 13 described methods and measure the gene importing efficient of the cell of collecting.The results are shown in Fig. 4.Among Fig. 4, trunnion axis is represented the dilution factor of viral supernatant and on behalf of gene, vertical axis import efficient.Hollow strips figure, shaded bar figure and real bar figure represent the result who uses therapy for clearing away heat, combined techniques and centrifuging gained respectively.

As shown in Figure 4, the gene importing efficient of application centrifuging is higher than traditional last therapy for clearing away heat and combined techniques (virus spontaneously is adsorbed to CH-296 in this method before infection).Therefore proof makes the virus precipitation by force by centrifugal force, and more virion is combined with CH-296 in the bottom of centrifuge tube.Specifically, when using the viral supernatant of dilution, centrifugal effect is very obvious.

In addition, measured through centrifuging or left standstill (combined techniques) titre in conjunction with the viral supernatant of virus back collection.The results are shown in table 21.

Table 21

Sample	Virus titer (cfu/ml)	In conjunction with after the response rate (%)
			Virus supernatant (before using)	8.7×10 5	100
Viral supernatant-combined techniques of collecting	7.8×10 5	89.4
			Viral supernatant-the centrifuging of collecting	7.6×10 4	8.8

Shown in table 21, when sample leaves standstill, the last honest and upright and thrifty 80-90% that contains in conjunction with preceding supernatant titre of collection.On the other hand, with the titre of the supernatant after the mandatory combination of centrifuging have only in conjunction with preceding supernatant 1/10 or lower, these results prove, by centrifugal force more virion are combined with CH-296.The PBS that is used to wash centrifuge tube after centrifugal contains 2% of about provirus amount.In addition, no matter have or not this step of washing, the gene of all observing much at one imports efficient.These results suggest are when using centrifuging, and virion can closely combine with CH-296.

In addition, the gene importing efficient of centrifuging and the gene importing efficient of cell method of infective virus in centrifugal process are contrasted.

Compared with the method for centrifuging and centrifugal-infect gene is imported the efficient of NIH/3T3 cell, the latter is deposited to virus with centrifugal force to make its infection (referring to WO95/10619) on the cell.As described in embodiment 14, with GP+E86 cell preparation virus supernatant, and with the culture supernatant of NIH/3T3 cell with concentration dilution to 1 * 10 ⁵Cfu/ml, getting 5ml should be used for this comparison by the virus supernatant.In brief, carrying out gene as follows imports.The above-mentioned viral supernatant of mentioning is joined in the centrifuge tube with CH-296 bag quilt.Should manage 4 hours so that 2900 * g is centrifugal in 30 ℃, wash with PBS then.Then cell is joined in this pipe, infect 4 hours (centrifuging) in 37 ℃.Cell is joined in the centrifuge tube that is coated with CH-296, and cultivated 2 hours.In this pipe, add described viral supernatant.Infected (centrifugal-the infection method) in 30 ℃ in 4 hours with centrifugal this pipe of 2900 * g.In these methods, centrifuge tube all wraps quilt with CH-296 as stated above, and with 1 * 10 ⁵The NIH/3T3 cell be used for gene and import.Metainfective cell plating again in the culture dish of 60-mm, and was cultivated 2 days.Press embodiment 4 described methods then and measure EGFP gene importing efficient, the results are shown in Fig. 5 with the flow cytometer method.

As shown in Figure 5, the result proves that the gene of centrifuging imports the gene importing efficient that efficient is higher than centrifugal-infection method.Think that this is owing to the infection inhibitory substance of having removed by washing in the viral supernatant.

Claims (10)

1. with retrovirus gene is imported the method for target cell, it is characterized in that this method comprises:

(1) will contain retroviral solution with have in conjunction with described retroviral activity and be fixed in last 3 hour of holder or the longer time functional materials contact;

(2) wash the described described retroviral holder that is combined with; With

(3) will be combined with described retroviral holder contacts and hatches with target cell

Wherein, described functional materials is selected from fibronectin, contains heparin-CH-296, fibroblast growth factor, collagen type v albumen, polylysine and the DEAE-glucosan in II territory.

According to the process of claim 1 wherein described have in conjunction with the active functional materials of retrovirus have activity in conjunction with target cell.

3. according to the method for claim 1, wherein use to be fixed with simultaneously on it and describedly have in conjunction with the active functional materials of retrovirus and have holder in conjunction with the active another kind of functional materials of described target cell, described have in conjunction with the active functional materials of described target cell be selected from cell adhesion protein, hormone, cytokine, antibody, sugar chain and carbohydrate.

4. according to the process of claim 1 wherein cell culture vessel or microgranule holder are used as described holder.

5. according to the process of claim 1 wherein the described culture supernatant that retroviral solution is the retrovirus cellulation of acquisition in the presence of the material that can promote the retrovirus generation that contains.

6. according to the method for claim 5, wherein said to contain retroviral solution be the culture supernatant that obtains when having sodium butyrate to exist.

7. one kind imports the method for target cell with retrovirus with gene, it is characterized in that this method is included in two kinds of functional materials and exists and use the retroviral infection target cell down:

(1) is selected from the functional materials of fibronectin, the CH-296 that contains heparin-II territory, fibroblast growth factor, collagen type v albumen, polylysine and DEAE-glucosan; With

(2) be selected from the antibody and the functional materials that derive from the sugar chain of laminin or high mannose type sugar chain of specificity in conjunction with the T cell differentiation antigen on target cell surface.

8. according to the method for claim 7, wherein said have in conjunction with described retroviral active functional materials have activity in conjunction with target cell.

9. according to the method for claim 7 or 8, wherein at least a of two kinds of functional materials is fixed on the holder.

10. according to the method for claim 9, wherein cell culture vessel or microgranule holder are used as described holder.

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