JPH06154317A - Cd4 positive cell capturing material - Google Patents

Abstract

PURPOSE:To provide the CD4 positive cell capturing material formed by immobilizing peptide or modified peptide which can capture the CD4 positive cells excessively increased in the ratio thereof by a certain cause and has the bondability with the CD4 positive cells to a non-woven fabric by applying this material to an extra corporeal circulation treatment system of blood, etc. CONSTITUTION:This CD4 positive cell capturing material is formed by immobilizing the peptide or modified peptide having the bondability with the CD4 positive cells to the nonwoven fabric having an amino group or imino group and 1 to 30mum average fiber diameter. The number of the total amino acid residues is confined within 70 pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a non-woven fabric on which a peptide having a specific amino acid sequence or a modified peptide containing the peptide region is immobilized to carry out extracorporeal circulation of blood by the packed column, thereby detecting CD4 antigen. The present invention relates to a CD4 positive (hereinafter referred to as CD4 +) cell trapping material for trapping, for example, helper T cells on the cell surface. The present invention is very useful in the treatment of various autoimmune diseases in which the proportion of CD4 + cells in the living body becomes excessive and the immune response becomes excessive due to the disturbance of the immune system balance due to some cause. Is.

[0002]

2. Description of the Related Art The CD4 molecule is a glycoprotein having a molecular weight of about 55 kilodaltons distributed on the cell membrane surface of helper cells, some monocytes, and macrophages. About 50% of thymocytes and about 70% of peripheral T cells. %. It is also expressed in adult T-cell leukemia cells and cutaneous T-cell lymphoma. The CD4 antigen on the helper cell binds to the major histocompatibility antigen (hereinafter referred to as MHC) on the macrophage when the T cell binds to the antigen presented by the macrophage by the cell receptor, and the association between the T cell, the antigen and the macrophage. Has the role of stabilizing. C of T cells
Non-receptor tyrosine kinase molecule p56 is used as D4 molecule
^lck is linked and functions as a CD4 signal transduction molecule. It is not clear about the physiological role of CD4 distributed on the surface of macrophages and monocytes.

Helper cells in the immune system are essential for proper response of antigens and are essential for most B cell antibody responses. Helper cells are activated when they recognize non-self antigens bound to the surface of antigen-presenting cells, secrete interleukin 2 and stimulate T cell proliferation, which assists B cell activation. And further promotes the production of antibodies. There are also helper cells that activate macrophages by secreting γ interferon as well as assisting lymphocytes.

In addition to helper T cells, cytotoxic T cells or suppressor T cells exist as a subpopulation of T cells, and a glycoprotein called CD8 exists as a surface marker thereof. Cytotoxic T cells directly destroy cells infected with the virus, and suppressor T cells mainly suppress the response of helper T cells. Two factors mainly involved in the regulation of immune response are helper T cells, which are CD4 + cells, and suppressor T cells, which are CD8 + cells (hereinafter referred to as CD8 + cells). In normal people, these C
By controlling both D4 + cells and CD8 + cells in a well-balanced manner, the in vivo immune response is regulated to an appropriate state. An abnormality occurs in the immune system due to a large change in the ratio of the numbers of the two for some reason.

In AIDS patients, human immunodeficiency virus, which is a type of retrovirus, destroys helper T cells and disables the immune system. Therefore, a microbial infection, which normally would not occur, is also developed. In this case CD4 + / CD8 +
The value of is much lower than that of normal people.

On the other hand, as the CD4 + / CD8 + value increases, there is a disease associated with delayed-type hypersensitivity that belongs to type 4 allergy. T cells that induce delayed hypersensitivity are distinct from helper T cells, which also carry the CD4 molecule. Diseases related to this include not only infectious diseases such as intracellular parasitic bacteria and fungi, dermatitis caused by plants and drugs, but also various autoimmune diseases such as systemic lupus erythematosus and rheumatoid arthritis that produce autoantibodies. It is considered that cells in the body are damaged by the allergic mechanism of species and T cells to cause lesions.

[0007] In treating various autoimmune diseases, administration of corticosteroids, removal of the spleen, administration of immunosuppressive agents, etc. are applied depending on the degree of the symptoms. However, there are many cases in which such drug therapy or splenectomy does not effectively recover. The mechanism for the occurrence of autoimmune diseases has not been fully clarified yet, and the absolute treatment method for such patients has not been established at present, and countermeasures are urgently needed.

As another treatment method for autoimmune diseases, various attempts have been made to adsorb and remove autoantibodies by extracorporeal circulation of blood using an immunoadsorption column. For example, application of a column in which protein A having a binding property with immunoglobulin is immobilized on a carrier is also under study. However, protein A is not very useful because it is expensive, has poor adsorption specificity, and has side effects. In addition, various immobilization columns for antibodies against the substance to be removed have been studied, but safety, storage stability problems, immobilization that allows antibodies to react effectively, and sterilization methods are limited. There are many problems in using it as medical equipment for reasons.

[0009]

DISCLOSURE OF THE INVENTION According to the present invention, extracorporeal circulation of blood is performed by using a non-woven fabric on which a peptide that recognizes CD4 existing on the surface of blood cells and has a binding property or a modified peptide thereof is immobilized. Therefore, it is intended to treat various diseases by controlling the immune system in vivo by specifically binding and removing CD4 + cells.

[0010]

[Means for Solving the Problems] The present invention, which has achieved the above-mentioned object, provides for the collection of CD4 + cells by a non-woven fabric on which a peptide or modified peptide containing an amino acid sequence which can be the complementarity determining region of an anti-CD4 antibody is immobilized. It is a summary.

The present invention intends to collect CD4 + cells by utilizing a peptide fragment having a specific amino acid sequence which constitutes the variable region of an anti-CD4 antibody. A region called a variable region exists in a portion consisting of about 110 amino acid residues from the N terminus of both the heavy chain and the light chain constituting the antibody molecule, and the amino acid sequence differs depending on the antibody molecule. . Further, among the variable regions, there are a part having a relatively similar amino acid sequence for each molecule and a part called a hypervariable region having a large difference in amino acid sequence for each molecule. The binding specificity with the antigen is determined by the latter part.

The hypervariable region exists in each of the heavy chain and the light chain at three positions and is composed of 20 to 30 amino acid residues. The part called the complementarity determining region, which is the site where the antibody binds to the antigen, is consistent with this hypervariable region, and the site actually involved in the binding is composed of 5 to 10 amino acid residues. It

Fragments corresponding to the complementarity determining regions from 31 to 35, 50 to 65, 95 to 102 from the N terminus in the heavy chain and from 24 to 34, 50 to 56, 89 to 97 from the N terminus in the light chain. Is. These six regions in total form a loop in each, and these regions collectively form an antigen-binding site. That is, the diversity of antigen-binding sites is caused by only slight changes in loop length and amino acid sequence in these regions. In addition, the higher order structure of the whole molecule necessary for fulfilling the function of the antibody other than this is maintained without being disturbed.

Anti-CD4 antibodies are OKT4 (Ortho), Leu3a (Becton Dickinson), T4.
(Coulter). CD4 has been relatively well studied among leukocyte differentiation antigens, and in some cases, the primary structure of the variable region has been determined and reported. If the primary structure of the variable region is known, it is possible to bind to the CD4 molecule by synthesizing a peptide containing a site corresponding to the above-mentioned complementarity determining region. For example, the amino acid sequence of the variable region in the light chain for the Leu3a antibody (J. Biol. Chem., 266, 146).
11, 1991) as an example, Lys-Ala-Se.
r-Gln-Ser-Val-Asp-Tyr-Asp
-Gly-Asp, Leu-Leu-Ile-Tyr-
Ala-Ala-Ser, Thr-Tyr-Tyr-C
Three of ys-Gln-Gln-Ser-Tyr-Glu correspond to the complementarity determining region.

The above-exemplified region is considered to be the minimum required region for binding to the CD4 molecule. When actually collecting CD4 + cells using such peptides,
It is necessary to reproduce the state close to the reaction mode with the CD4 molecule in blood. Further, it is often necessary to consider the stability of the structure when it is present in blood, or to increase the solubility in an aqueous solvent when it is immobilized on a carrier.

Therefore, one or both end regions of the above-mentioned peptide region is extended according to the amino acid sequence of each protein, or several amino acids such as lysine for increasing water solubility are added to the end. It is preferable to bind or to bind an amino acid such as cysteine to the terminal to facilitate immobilization on the carrier. The total number of amino acid residues in the peptide or modified peptide actually used is preferably 70 or less, but more preferably 30 or less in view of difficulty in synthesis, cost, stability and the like. Furthermore, considering the ease of formation of higher-order structures required to express immunogenicity, etc., 10 to 2
It can be said that 5 pieces are optimal.

In consideration of the immobilization reaction and stability,
For example, it is also preferable to use an organic compound obtained by modifying the above-mentioned peptide by amidating the N-terminal or introducing an appropriate functional group at the terminal. In addition, multiple peptides
_{(CH 2) n -B- (A} , B represents NH or CO)
CD4 also has a side chain as shown in
It is possible to further increase the binding property to + cells. In this case, the value of n is preferably 1 to 20, and more preferably 3 to 10.

The method of peptide synthesis is not particularly limited, but it is easier to apply the solid phase synthesis method than the liquid phase synthesis method. In this case, an amino acid corresponding to the C-terminal of the peptide to be synthesized is bound to a support that is insoluble in an organic solvent, and corresponding amino acids with functional groups such as α-amino groups other than α-carboxyl groups protected in the N-terminal direction are sequentially condensed. After binding by reaction, the peptide chain is extended by alternately repeating the reaction of removing the protecting group after binding.

After obtaining the desired peptide, the peptide chain is cleaved from the support and deprotected. Hydrogen fluoride is often used for this, but in terms of safety and ease of handling, trifluoromethanesulfonic acid (hereinafter TFM) is used.
It is suitable to use SA). After deprotection by reacting with thioanisole and 1,2-ethanedithiol in TFMSA, trifluoroacetic acid (hereinafter referred to as TF
The peptide is recovered by cleaving from the support according to (A). The crude peptide is obtained by freeze-drying this.

The above crude peptide is a high performance liquid chromatography (hereinafter referred to as HPLC) using a reversed phase column.
The product is collected and purified. The HPLC conditions are usually optimized based on the system used for protein purification. A fraction corresponding to the obtained chromatographic peak is collected and freeze-dried. Molecular weight analysis of the obtained purified peptide fraction by mass spectrometry,
Identification is performed by amino acid composition analysis or amino acid sequence analysis.

The type of non-woven fabric used for immobilizing the above-mentioned peptide or modified peptide is not particularly limited, but when used for blood purification, it may be used as a complement system or coagulation system upon contact with components in blood. Polyethylene terephthalate (PE
T), polypropylene (PP), polyethylene (P
E), polyamide, cellulose (cotton), rayon and the like can be mentioned, but PET, PE, cotton or rayon are preferable in consideration of easiness of modification and strength retention after modification.

There are various methods for introducing an amino group or an imino group into the nonwoven fabric. For example PP, PE
In this case, there is a method for producing a nonwoven fabric by copolymerizing a vinyl compound having an amino group or an imino group in advance, for example, a compound such as dialkylethyl acrylate or dialkylaminopropyl acrylate represented by Chemical formula 1 or Chemical formula 2. Further, there is a method of irradiating these materials with an electron beam, an ultraviolet ray or ozone to generate radicals or ions, and graft polymerizing a vinyl compound having an amino group or an imino group as shown in Chemical formula 1 or Chemical formula 2.
In this case, other vinyl monomers may coexist.

[0023]

[Chemical 1]

[0024]

[Chemical 2] In Chemical formula 1 and Chemical formula 2, R ₁ is a hydrogen atom or a methyl group,
R ₂ and R ₃ represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 5.

In the case of cotton or rayon, it may be oxidized by periodic acid to cleave its glycol moiety to introduce an aldehyde group, and this may be oxidized to introduce a carboxyl group, or the aldehyde group may be introduced. It is advisable to react a compound having at least one primary amino group such as ammonia, ethylenediamine, hexamethylenediamine or polyethyleneimine to form a Schiff base, and reduce it to introduce an amino group or an imino group. . When using polyethyleneimine, the molecular weight is 100 to 10
It is preferably 0,000, more preferably 200 to 100,000.

Further, as a method for introducing an amino group or an imino group by electron beam irradiation, a vinyl compound having an amino group or an imino group as shown in Chemical formula 1 or Chemical formula 2 is dissolved directly or after dissolving in a suitable solvent and then dried. There is a method of irradiating a line. At this time, if the boiling point of the vinyl compound is low, it is difficult to control the graft amount by evaporating under a dry condition. In this case, it is preferable to mix with a high-boiling compound and apply it to suppress evaporation. As the high boiling point solvent to be mixed, polyhydric alcohols such as ethylene glycol, diethylene glycol, polyethylene glycol having a degree of polymerization of 10 or less, and glycerin are particularly preferable.

Further, in order to increase the grafting efficiency of the vinyl compound having an amino group or an imino group exemplified in Chemical formulas 1 and 2, it is preferable to use it in combination with a polyfunctional crosslinkable vinyl compound. As these crosslinkable vinyl compounds, in addition to monomers having a plurality of vinyl groups such as methylenebisacrylamide, trimethylolpropane diacrylate, trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, triallyl isocyanurate, Examples thereof include compounds represented by the general formula:

Among these crosslinkable compounds, the case of using the chemical formula 3 has the best introduction rate of the amino group or imino group, and the content of the amino group or imino group can be freely controlled. R ₁ , R ₂ , and R 3 in Chemical formula ₃ each represent a hydrogen atom or a methyl group. N is 1 to 3
Indicates an integer of 00.

[0029]

[Chemical 3]

Further, the chemical formula 3 and an amino group or imino group having no vinyl group such as polyethyleneimine, poly (dimethylaminopropylacrylamide) and poly (diethylaminoethyl acrylate), poly (diethylaminomethacrylate) or a derivative thereof are added. It is possible to introduce amino groups or imino groups by grafting by using a mixture with a polymer having a high concentration. The value of n in Chemical formula 3 is preferably 5 to 150, more preferably 10 to 70.

The concentration of the solution for applying these compounds is 0.1 to 20%, preferably 0.5 to 10.
%, Any solvent can be used as long as it dissolves both the crosslinkable compound and the compound containing an amino group or an imino group, but water, methanol, ethanol,
Methylene chloride, chloroform, acetone, dioxane,
Tetrahydrofuran or a mixed solvent thereof can be used. The mixing ratio of the compound having an amino group or imino group and the crosslinkable compound is 50: 1 to 1:50, preferably 30: 1 to 1:30.

Various studies were conducted on the method of introducing an amino group or an imino group into a non-woven fabric. As a result, a polymer or polyethylene obtained by containing 10 mol% or more of the chemical formula 1 and chemical formula 2 units and copolymerizing with another vinyl compound. A method of mixing imine or a derivative thereof and the compound represented by Chemical formula 3 and applying the mixture to a nonwoven fabric and then grafting by electron beam irradiation is particularly preferable because it is simple and does not cause deterioration such as strength reduction.
The material of the non-woven fabric used in this case is PET, P
E, rayon and cotton are preferable, and PET is particularly preferable. The irradiation dose is preferably 1 to 20 Mrad, more preferably 2 to 10 Mrad.

The content of the amino group or imino group thus introduced is 1 μeq / g to 5 meq / g, preferably 10 μeq / g to 3 meq / g, and more preferably 30 μeq / g to 2 meq / g. The residual amount of the amino group or imino group thus introduced after immobilization of the peptide is 0.1 μeq / g to 1 meq / g, preferably 0.5 μeq / g in order to suppress adhesion of blood cell components such as platelets. g to 0.5 meq /
g, more preferably 1 μeq / g to 0.3 meq
/ G.

When an amino group or an imino group is introduced from the compound represented by the chemical formula 3 and a polymer having an amino group or an imino group as described above, it may be due to the synergistic effect of the amino group and polyethylene glycol, such as platelets and leukocytes. Adhesion is low, and complement activity and coagulation factor activity of blood are suppressed, which is preferable.

There are various methods for immobilizing the above-mentioned peptides having the ability to bind to CD4 + cells to a nonwoven fabric having an amino group or an imino group introduced therein. In this case, the peptide or modified peptide used as the ligand is a relatively stable and low-molecular weight substance, and the immobilization reaction conditions are less restricted than in the case of immobilizing a high-molecular-weight protein such as an enzyme or an antibody. That is also one of the advantageous factors. Therefore, the immobilization method is not particularly limited, but the following method is preferable.

Usually, for the purpose of improving cell collection efficiency and binding property by reducing steric hindrance and suppressing non-specific adsorption, a hydrophilic spacer is introduced, and peptides are added to the ends thereof. It is preferably immobilized.
As the hydrophilic spacer, one that can utilize the introduced amino group or imino group is preferable, and it is preferable to use polyethylene glycol having a carboxyl group or a glycidyl group at both ends. In this case, the molecular weight of polyethylene glycol is 100 to 20000, preferably 200 to 10000, and more preferably 500 to 5000.

When polyethylene glycol having carboxyl groups at both ends (hereinafter referred to as PEO acid) is used,
First, an amino group or imino group of the non-woven fabric is bound with an amide bond using a condensing agent such as carbodiimide, and then the other carboxyl group and the amino group end of the peptide are condensed in the presence of a condensing agent to form an amide group. Perform the immobilization.

When polyethylene glycol having a glycidyl group at both ends is used, a spacer is first introduced by the reaction between the glycidyl group at one end and the amino group of the nonwoven fabric, and then the glycidyl group at the other end and the amino group of the peptide. Immobilization is performed by reacting with a group.

However, when an amino group or an imino group is introduced by using the derivative polymer obtained from Chemical Formula 1 or Chemical Formula 2 and Chemical Formula 3, the grafted derivative polymer itself plays the role of a hydrophilic spacer, This is also preferable. That is, immobilization by condensing the amino group or imino group of these grafted derivative polymers and the carboxyl group end of the peptide by the above-mentioned method is advantageous as compared with other methods.

[0040]

EXAMPLES The method for introducing the peptides of the present invention into the non-woven fabric into which amino groups have been introduced is not particularly limited as long as it is based on the above description. The present invention will be described below with reference to examples.

<Example 1> Thr-Ile-Ser-
Cys-Lys-Ala-Ser-Gln-Ser-V
al-Asp-Tyr-Asp-Gly-Asp-Se
Immobilization of r-Tyr-Met-Asn onto a nonwoven fabric (1) Synthesis of peptide 20 to 3 in the variable region of the light chain of the anti-Leu3 antibody
Thr-Ile-Se which is an area corresponding to the 8th
r-Cys-Lys-Ala-Ser-Gln-Ser
-Val-Asp-Tyr-Asp-Gly-Asp-
Synthesis of a peptide having a sequence of Ser-Tyr-Met-Asn was carried out by using a peptide synthesizer Model 430A.
(Manufactured by Applied Biosystems) was used to carry out solid phase synthesis. PAM asparagine (t-Boc-L-As), which is a support having C-terminal asparagine bound thereto
n) 0.5 mmol (manufactured by Applied Biosystems) was used to extend the peptide chain by repeating the deprotection reaction and the condensation reaction in the N-terminal direction in accordance with the synthetic program published in the above peptide synthesizer. That is, TFA and dichloromethane (hereinafter DCM
The protective group t-butoxycarbonyl group is removed by washing with DCM, neutralized with diisopropylethylamine and DCC, and washed with dimethylformamide (hereinafter referred to as DMF) to carry out the condensation reaction.
The operation of washing with DCM was repeated. Amino acid is t-Bo
c-L-Thr (Bzl), t-Boc-L-Ile.
_{1 / 2H 2 O, t-} Boc-L-Ser (Bzl), t
-Boc-L-Lys (Cl-Z), t-Boc-L-
Ala, t-Boc-L-Gln, t-Boc-L-V
al, t-Boc-L-Asp (OBzl), t-Bo
c-L-Tyr (Br-Z), t-Boc-L-Gl
A 2.0 mmol cartridge of y, t-Boc-L-Met (all manufactured by Applied Biosystems) was used.

(2) Deprotection group, cleavage of peptide chain 1 m of thioanisole was added to 1 g of the support on which the above reaction was completed.
Add 1,0.5 ml of 1,1,2-ethanedithiol to 10
After stirring for 10 minutes, 10 ml of TFA was added while cooling with ice water, and the mixture was stirred for 10 minutes. Further, 1 ml of TFMSA was added and the mixture was stirred at room temperature for 30 minutes. Pre-cooled diethyl ether is added to this until it does not appear, and the mixture is stirred, filtered while washing with diethyl ether using a medium-pore glass filter, and TFA is added to dissolve the peptide in ether. I collected it. The peptide in ether was filtered through a fine-hole glass filter, the peptide on the glass filter was dissolved in 2N acetic acid, and freeze-dried to obtain a crude peptide.

(3) Purification of peptide The above crude peptide was dissolved again in 2N acetic acid,
The solution filtered with a 2 μm membrane filter is HPL
Subjected to C. For HPLC, Model 130A system (manufactured by Applied Biosystems) was used, and for the column, reverse phase Aquapore Prep-10, C8 (manufactured by Applied Biosystems) was used. As the mobile phase, water containing 0.1% TFA was used as solution A, and 70% acetonitrile / water (v / v) containing 0.1% TFA was used as solution B.
Elution was performed with a linear concentration gradient from solution to solution B. The chromatographic peak was almost single, and the corresponding fractions were collected. The fractionation was repeated several times, and this was freeze-dried to obtain a purified peptide. The obtained peptide is BIOION
It was confirmed by analysis with a 20 mass analyzer (manufactured by Applied Biosystems) that the target peptide was obtained.

(4) Polyethylene diacrylate (CH ₂ = C) in which R ₁ , R ₂ and R ₃ are hydrogen atoms and n is 14 in Modification 3 of the nonwoven fabric
_{H-COO- (CH 2 CH 2} O) 14 -OC-CH 2 = C
0.1 g of H ₂ ) and ₂ g of polyethyleneimine having a molecular weight of 10,000 are dissolved in 200 ml of methanol,
A PET non-woven fabric with a fiber diameter of 3.5 μm cut into m squares was dipped in this solution and dried, and then 5 Mrad each was irradiated with 10 Mrad electron beams on both sides of the non-woven fabric. The nonwoven fabric after the electron beam irradiation was washed with water and methanol three times each and air dried. The amino group content of the resulting non-woven fabric was determined by potentiometric titration with hydrochloric acid using COMTI.
Performed by TE101 (made by Hiranuma Sangyo), 0.13me
It was q / g.

(5) Introduction of Peptide into Nonwoven Fabric 25 mg of the purified peptide obtained in (3) was dissolved in a citrate buffer solution having a pH of 4.5 and then ice-cooled to obtain EDC (1-ethyl) which is a water-soluble carbodiimide reagent. -3- (3-Dimethylaminopropyl) carbodiimide) (10 mg) was added, and the mixture was stirred for 30 minutes while cooling with ice. Furthermore, the above-mentioned modified non-woven fabric was added and shaken at room temperature for 24 hours for reaction. The non-woven fabric after the reaction was washed with water three times to obtain a target collecting material. The peptide immobilization rate was calculated by quantifying the nitrogen content in the reaction residual liquid by the micro Kjeldahl method, and 82% was introduced.

(6) Performance Evaluation of Peptide-Immobilized Collection Material The binding property of the above collection material to CD4 + cells was evaluated using human blood. Assemble a column filled with 20 pieces of the above-mentioned trapping material cut into the shape and the size of a diamond-shaped polycarbonate module case having a side of 7 cm to 100 U / m.
100 ml of physiological saline containing 1 heparin, then 1 U
The inside of the column and the inside of the blood circuit were washed with 100 ml of physiological saline containing / par heparin. On the other hand, 100 ml of human blood to which citric acid had been added was taken into a beaker, and a blood circuit was set up so that it was returned to the beaker through the column. Using this device, a perfusion experiment was conducted continuously for 1 hour at a blood flow rate of 30 ml / min.

The change in the number of CD4 + cells and CD8 + cells in serum before and after this treatment was quantified by the flow cytometry method. Cells are Ficoll-Conray
It was prepared by the method and carried out using the Leu3a and Leu2a antibodies labeled with fluorescein isothiocyanate. Flow cytometry is EPICS-
PROFILE2 (manufactured by Coulter) was used. The results are as shown in Table 1, and are shown as the reduction rate [%] of the number of each cell compared to before this treatment. The nonspecific adsorption of albumin was also quantified using Albumin B-Test Wako (manufactured by Wako Pure Chemical Industries, Ltd.). The results are shown in Table 1 and are shown by the adsorption rate [%]. The adhesion of platelets was also examined by quantifying the number of platelets before and after this treatment using a Coulter Counter ZM type (manufactured by Coulter Electronics). The results are as shown in Table 1 and are shown by the reduction rate [%] of the platelet count.

[0048]

[Table 1]

<Example 2> Gln-Pro-Pro-
Lys-Leu-Leu-Ile-Tyr-Ala-A
Immobilization of la-Ser-Asn-Leu-Glu-Ser on non-woven fabric 46 to 6 in the variable region of the light chain of anti-Leu3 antibody
Gln-Pro-Pr which is a region corresponding to 0th
o-Lys-Leu-Leu-Ile-Tyr-Ala
Also regarding the synthesis of the peptide having the sequence of -Ala-Ser-Asn-Leu-Glu-Ser, PAM serine (t-Boc-L-Ser (Bzl)) (manufactured by Applied Biosystems) and t-Boc-L-Gln. ，
t-Boc-L-Pro, t-Boc-L-Lys (C
l-Z), t-Boc -L-Leu · H 2 O, t-Bo
c-L-Ile · 1 / 2H 2 O, t-Boc-L-Ty
r (Br-Z), t-Boc-L-Ala, t-Boc
-L-Ser (Bzl), t-Boc-L-Glu (O
Bzl) (all manufactured by Applied Biosystems)
Was carried out in the same manner as in Example 1. Deprotection group of synthesized support, cleavage of peptide chain, reverse phase HPL
Purification and identification by C were carried out in the same manner as in Example 1.

In Chemical formula 2, R ₁ and R ₂ are hydrogen atoms and R ₃
Is a methyl group and n is 3, and 10 ml of methylaminopropylacrylamide, 40 g of N-isopropylacrylamide, 2 ml of allylamine and 0.4 g of azoisobutylnitrile are dissolved in 160 ml of ethanol under stirring in the presence of nitrogen. Nitrogen was sent for a minute to completely replace the inside of the system with nitrogen. Further, polymerization was carried out by stirring in a water bath at 70 ° C. for 2 hours in the presence of nitrogen. The precipitate was washed with distilled water at 50 to 60 ° C., water was removed by decantation, and dried under reduced pressure at 40 ° C. to obtain poly (N-isopropylacrylamide).

3 g of the above polymer was dissolved in 150 ml of methanol together with 0.5 g of methylenebisacrylamide, and a PET non-woven fabric with a fiber diameter of 3.5 μm cut into a size of 15 cm square in the same manner as in Example 1 was dipped in this solution. Both sides of the nonwoven fabric were irradiated with an electron beam of 10 Mrad in total of 5 Mrad. The nonwoven fabric after the electron beam irradiation was washed with water and methanol three times each and air dried.
The amino group content of the obtained nonwoven fabric was quantified by potentiometric titration in the same manner as in Example 1 and found to be 0.085 meq / g.

As in Example 1, 50 mg of the above peptide was dissolved in a citrate buffer solution having a pH of 4.5 and then ice-cooled, 10 mg of EDC was added, and the mixture was stirred for 30 minutes while ice-cooling. Add the modified non-woven fabric above and add 2
The reaction was carried out by shaking for 4 hours. The non-woven fabric after the reaction was washed with water three times to obtain a target collecting material. The immobilization rate of the peptide was determined in the same manner as in Example 1 and 84% was introduced. The performance of the obtained trapping material was evaluated in the same manner as in Example 1 by assembling a column and then performing a perfusion experiment using human blood. CD4 + cells, CD8 in serum after treatment
The amount of + cells and the amount of albumin were quantified in the same manner as in Example 1. The results are shown in Table 1 as a reduction rate [%]. The results of the examination of platelet adhesion in the same manner as in Example 1 are shown in Table 1.
The rate of decrease in the number of platelets [%].

Example 3 Glu-Gly-Thr-
Ala-Thr-Tyr-Tyr-Cys-Gln-G
ln-Ser-Tyr-Glu-Asp-Pro-Pr
Immobilization of o-Thr on non-woven fabric 85 to 1 in the variable region of the light chain of anti-Leu3 antibody
Glu-Gly-T which is a region corresponding to the 01st
hr-Ala-Thr-Tyr-Tyr-Cys-Gl
n-Gln-Ser-Tyr-Glu-Asp-Pro
Also regarding the synthesis of a peptide having the sequence of -Pro-Thr, PAM threonine (t-Boc-L-Thr (Bz
l)) (manufactured by Applied Biosystems) and t-
Boc-L-Glu (OBzl), t-Boc-L-G
ly, t-Boc-L-Thr (Bzl), t-Boc
-L-Ala, t-Boc-L-Tyr (Br-Z),
t-Boc-L-Cys ( 4CH 3 Bzl), t-Bo
c-L-Gln, t-Boc-L-Ser (Bzl),
t-Boc-L-Asp (OBzl), t-Boc-L
-Pro (all manufactured by Applied Biosystems)
Was carried out in the same manner as in Example 1. Deprotection group of synthesized support, cleavage of peptide chain, reverse phase HPL
Purification and identification by C were carried out in the same manner as in Example 1.

PH of 30 g of PEO acid having a molecular weight of 1000
After dissolving in 500 ml of a citrate buffer solution of 4.5, the mixture was ice-cooled, 10 mg of EDC was added, and the mixture was stirred for 30 minutes while ice-cooling. The amino group obtained in the same manner as in Example 1 was introduced (0.
12 meq / g) of 30 modified non-woven fabrics
The reaction was carried out for 24 hours by shaking in an acid solution at room temperature. After the reaction was completed, the non-woven fabric was washed with water three times to obtain a non-woven fabric into which PEO acid was introduced. The carboxyl group content was quantitatively determined by titration with an aqueous sodium hydroxide solution.
It was 078 meq / g.

In the same manner as in Example 1, 25 mg of the above peptide was dissolved in a citrate buffer solution having a pH of 4.5 and then ice-cooled, 10 mg of EDC was added, and the mixture was stirred for 30 minutes while ice-cooling. Further, the above-mentioned non-woven fabric into which PEO acid was introduced was added, and shaken at room temperature for 24 hours for reaction. The non-woven fabric after the reaction was washed with water three times to obtain a target collecting material. The peptide immobilization rate was determined in the same manner as in Example 1 8
1% had been introduced. The performance of the obtained trapping material was evaluated in the same manner as in Example 1 by assembling a column and then performing a perfusion experiment using human blood. CD4 in serum after treatment
The amount of + cells, CD8 + cells and the amount of albumin were quantified in the same manner as in Example 1. The results are shown in Table 1 as a reduction rate [%]. The platelet adhesion was also examined in the same manner as in Example 1, and the results are shown in Table 1 as the platelet count reduction rate [%].

Example 4 Tyr-Phe-Cys-
Ala-Arg-Arg-Gly-Lys-Gly-T
Immobilization of hr on non-woven fabric 94 to 1 in variable region of heavy chain of anti-Leu3 antibody
Tyr-Phe-C which is a region corresponding to the 03rd
ys-Ala-Arg-Arg-Gly-Lys-Gl
Also for the synthesis of peptides having the sequence of y-Thr, P
AM threonine (t-Boc-L-Thr (Bzl))
(Manufactured by Applied Biosystems) and t-Boc
-L-Tyr (Br-Z), t-Boc-L-Phe,
t-Boc-L-Cys ( 4CH 3 Bzl), t-Bo
c-L-Ala, t-Boc-L-Arg (Tos),
t-Boc-L-Gly, t-Boc-L-Lys (C
1-Z), (all manufactured by Applied Biosystems) were carried out in the same manner as in Example 1. Deprotection group of support after synthesis, peptide chain cleavage, reverse phase H
Purification and identification by PLC were performed in the same manner as in Example 1.

6 g of PEO acid having a molecular weight of 5000 was added to pH 4.
Dissolved in 500 ml of citrate buffer solution of 5 and then cooled with ice.
DC 10 mg was added, and the mixture was stirred for 30 minutes while cooling with ice.
Introduction of an amino group obtained in the same manner as in Example 2 (0.080
30 sheets of modified non-woven fabric (meq / g) were reacted in the PEO acid solution by shaking at room temperature for 24 hours. After the reaction was completed, the non-woven fabric was washed with water three times to obtain a non-woven fabric into which PEO acid was introduced. The amino group content was determined in the same manner as in Example 3 and found to be 0.054 meq / g.

50 mg of the above peptide was dissolved in a citrate buffer solution having a pH of 4.5 as in Example 1 and ice-cooled, 10 mg of EDC was added, and the mixture was stirred for 30 minutes while ice-cooling. Further, the above-mentioned non-woven fabric into which PEO acid was introduced was added, and shaken at room temperature for 24 hours for reaction. The non-woven fabric after the reaction was washed with water three times to obtain a target collecting material. The peptide immobilization rate was determined in the same manner as in Example 1 8
1% had been introduced. The performance of the obtained trapping material was evaluated in the same manner as in Example 1 by assembling a column and then conducting a perfusion experiment using human blood. CD4 in serum after treatment
The amount of + cells, CD8 + cells and the amount of albumin were quantified in the same manner as in Example 1. The results are shown in Table 1 as a reduction rate [%]. The platelet adhesion was also examined in the same manner as in Example 1, and the results are shown in Table 1 as the platelet count reduction rate [%].

[0059]

[Comparative example]

<Comparative Example 1> Thr-Ile-Ser-Cys-Ly
s-Ala-Ser-Gln-Ser-Val-Asp
-Tyr-Asp-Gly-Asp-Ser-Tyr-
Immobilization of Met-Asn on a nonwoven fabric Thr-Ile-Ser-Cys-Ly obtained in Example 1
s-Ala-Ser-Gln-Ser-Val-Asp
-Tyr-Asp-Gly-Asp-Ser-Tyr-
Introduction of Met-Asn into a cotton non-woven fabric was carried out as follows. Fiber diameter 12μ cut into 15 cm square
30 pieces of cotton non-woven fabric of m were added to 500 ml of a solution prepared by dissolving 1 wt% concentration of sodium periodate in 1N sulfuric acid, and reacted for 22 hours by shaking. After the completion of the reaction, the nonwoven fabric was washed with water three times to obtain an aldehyde group-introduced nonwoven fabric. The aldehyde content was determined by the oxime method and was 0.45 meq / g.

25 mg of the above peptide was dissolved in 500 ml of a carbonate buffer solution having a pH of 9.5, the above aldehyde group-introduced nonwoven fabric was added, and the Schiff base reaction was carried out for 24 hours by shaking. After the reaction was completed, the nonwoven fabric was washed with water three times. The peptide immobilization rate was determined in the same manner as in Example 1 and 88% was introduced. Then 1 g of sodium borohydride (NaB
H ₄ ) was dissolved in 500 ml of a carbonate buffer solution having a pH of 9.0, the above non-woven fabric was added, and the mixture was reacted by shaking for 20 hours. After the reaction was completed, the non-woven fabric was washed with water three times to obtain a target collecting material. The performance of the obtained trapping material was evaluated in the same manner as in Example 1 by assembling a column and then conducting a perfusion experiment using human blood. CD4 + cells, CD8 in serum after treatment
The amount of + cells and the amount of albumin were quantified in the same manner as in Example 1. The results are shown in Table 1 as a reduction rate [%]. The results of the examination of platelet adhesion in the same manner as in Example 1 are shown in Table 1.
The rate of decrease in the number of platelets [%].

<Comparative Example 2> Ser-Leu-Ala-
Val-Ser-Leu-Gly-Gln-Arg-A
Immobilization of la-Thr on non-woven fabric 10 to 2 in the variable region of the light chain of anti-Leu3 antibody
Ser-Leu-Al which is a region corresponding to 0th
a-Val-Ser-Leu-Gly-Gln-Arg
For the synthesis of peptides having the sequence -Ala-Thr, PAM threonine (t-Boc-L-Thr (Bz
l)) (manufactured by Applied Biosystems) and t-
Boc-L-Ser (Bzl), t-Boc-L-Le
u · H ₂ O, t-Boc-L-Ala, t-Boc-L
-Val, t-Boc-L-Gly, t-Boc-L-
Gln, t-Boc-L-Arg (Tos) (all manufactured by Applied Biosystems) was used and carried out in the same manner as in Example 1. This peptide region is also a relatively large hydrophilic region. Deprotection of the support after the synthesis, cleavage of the peptide chain, purification by reverse phase HPLC and identification were also carried out in the same manner as in Example 1.

Using the same conditions as in Comparative Example 1, the above-mentioned peptide was introduced into a cotton nonwoven fabric into which an aldehyde group was introduced (0.55 meq / g) under the same reaction conditions as in Comparative Example 1. The immobilization rate of the peptide was determined in the same manner as in Example 1 and 81% was introduced. The performance of the obtained trapping material was evaluated in the same manner as in Example 1 by assembling a column and then conducting a perfusion experiment using human blood. The amount of CD4 + cells and CD8 + cells and the amount of albumin in the serum after the treatment were quantified in the same manner as in Example 1. The results are shown in Table 1 as a reduction rate [%]. The platelet adhesion was also examined in the same manner as in Example 1, and the results are shown in Table 1 as the platelet count reduction rate [%].

[0063]

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to effectively bind to CD4 + cells in blood, and it can be applied to the treatment of various autoimmune diseases. CD4 in the present invention
Blood purification therapy using + cell collection material is safe with no side effects and is excellent in terms of storage stability. By using a non-woven fabric, it is possible to perform extracorporeal circulation by treating whole blood that does not require plasma separation as in the past. Further, the presence of the carboxyl group facilitates the introduction of peptides that are ligands. Further, it is advantageous as a medical device in that the activity as a ligand hardly decreases even if steam sterilization by autoclave treatment is performed.

[Procedure amendment]

[Submission date] December 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Immobilize the above peptide or modified peptide
The types of non-woven fabrics used when converting into
However, when used for blood purification, contact with blood components
It is necessary to consider the effect on the complement system and coagulation system when touched.
Polyethylene terephthalate (PE
T), polypropylene (PP), polyethylene (P
E), polyamide, cellulose (cotton) and rayon
Examples include the ease of modification and strength retention after modification.
Considering that, PET, PE, cotton or rayon are preferred.
Yes. In order to suppress the adhesiveness of blood cell components, the fiber diameter should be
1 to 30 μm is preferable, and 3 to 20 μm is more preferable.
Good As a non-woven fabric composed of these fibers,
For the purpose of the present invention, the density (filling rate) of the nonwoven fabric is
0.6 g / cm ³Or less, more preferably 0.4 g / cm
³It is as follows. The lower limit is the contact efficiency.
From the point of 0.01g / cm³Or more, more preferably 0.
02 g / cm³That is all.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Tanaka 2-1-1 Katata, Otsu City, Shiga Prefecture Toyobo Co., Ltd.

Claims (2)

[Claims] 1. Determination of complementarity in an amino acid sequence constituting a variable region of a heavy chain or a light chain in an anti-CD4 antibody, to a non-woven fabric mainly composed of fibers having an average fiber diameter of 1 to 30 μm containing an amino group or an imino group. A CD4 positive cell collecting material, wherein a peptide forming a region or a modified peptide thereof is immobilized. 2. The modified peptide according to claim 1 is anti-CD.
4 at least one of the regions forming the complementarity determining region in the amino acid sequence constituting the variable region of the heavy chain or light chain of the antibody, the both ends or one end of which is an amino acid, peptide or -A- (CH _{2) n} -B-
(A and B are NH or CO, n is an integer of 1 to 20)
A CD4-positive cell-capturing material, characterized in that any of the following is bound by a peptide bond and the total number of amino acid residues is 70 or less.