CN101671390B - Human interferon alpha derivatives and preparation and use of pegylated products thereof - Google Patents

Abstract

The invention relates to human interferon alpha derivatives and preparation and use of pegylated products thereof. The human interferon alpha derivatives are formed by bonding three amino acids to N terminals of human interferon alpha and have a structural formula of R3-R2-R1-interferon, wherein the interferon is the human interferon alpha, and a first position amino acid R1 bonded to the N terminals of the human interferon alpha is a sculpture amino acid or glycine; the second position amino R2 is an aromatic amino acid or glycine; and the third position amino acid R3 is an acidic amino acid or glycine. The invention also provides pegylated derivatives of the human interferon alpha derivatives, a preparation method thereof and use thereof in the preparation of medicaments for treating and preventing viral infection or lung cancer. The human interferon alpha derivatives have the advantages of high specific activity and high pegylation rate. The pegylated derivatives of the human interferon alpha derivatives have the characteristics of high biological activity and no non-N terminal modified isomers and have the advantages of prolonging in-vivo half-life, reducing plasma clearance and the like.

Description

The preparation of human interferon alpha derivative and pegylated products thereof thereof and purposes

Technical field

The present invention relates to field of biomedicine technology, be specifically related to the preparation and the purposes of human interferon alpha derivative and pegylated products thereof thereof.

Background technology

Human interferon (interferon; Be called for short IFN) be the active protein that exists in one type of body with broad-spectrum antiviral, antiproliferative and immunomodulatory function, be one of cytokine that is used for the earliest clinical treatment, human interferon can be divided into three types; It is human interferon-alpha; Human interferon-β, human interferon-gamma also can be further divided into some hypotypes according to the aminoacid sequence difference of various IFN.Prove that through a large amount of clinical studyes human interferon-alpha is a kind of important antitumor and antiviral therapy medicine.At present China clinical most popular mainly be recombinant human interferon-alpha-1a, α-2a and α-1b.

There is more than 20 gene member in the I type family of finder's interferon alpha at present, and wherein most of encode functional protein has about 90% homology each other on nucleotide level.Human interferon-alpha is made up of 165 amino acid, and molecular weight is about 19000 dalton.The clinical therapeutic efficacy of existing human interferon-alpha preparation is still undesirable, and its antiviral specific activity is merely 1 * 10 ⁸IU/mg, the bigger shortcoming of spinoff when existing heavy dose.

But, no matter be human interferon-alpha-2a, human interferon-alpha-1b and human interferon-alpha-1a, as protein property medicine, because poor stability, plasma clearance is high, and transformation period weak point in the body is prone to produce antigen antibody reaction etc., on clinical treatment, is very limited.Genetic engineering technique makes extensive synthetic human recombination protein become possibility, has solved the immunogenicity problem that heterologous protein causes to a great extent, but still can't overcome shortcomings such as the fast and bioavailability of plasma clearance is low.The result that these shortcomings cause is: need frequent injection human interferon just can reach effective plasma treatment concentration; And, all can cause after the per injection Plasma Concentration than great fluctuation process, form " Feng Yigu " effect of drug level.So just possibly increase the risk of medical expense and administration inconvenience and untoward reaction.

Polyethyleneglycol modified proteinic technology is a kind of new technology that is used to improve pharmacokinetics character in the protein drug body that grows up over past ten years.It is that activated polyglycol molecule (PEG) is bonded on the protein molecule surface; Thereby influence proteinic space structure, finally cause the change of the various biochemical properties of protein, as: chemicalstability increases; The ability of opposing protease hydrolysis improves; Immunogenicity and toxicity reduce or disappear, and the transformation period prolongs in the body, and plasma clearance reduces or the like.

The PEG component is the amphipathic molecule of the inertia long-chain that is polymerized by the oxygen vinyl monomer.Now existing multiple different PEG molecule can supply to utilize.Its active function gene of the PEG that is activated can be coupled to certain privileged sites (such as amino, sulfydryl or other nucleophiles) of treatment molecule.N-terminal is modified then can obtain the high specific modified outcome, can effectively control the purity of modified outcome, makes the simpler and also easier evaluation of quality product of technology.

Summary of the invention

One of the object of the invention provides a kind of new human interferon alpha derivative, is through human interferon-alpha is modified acquisition, and this human interferon alpha derivative has the specific activity height, and antiviral specific activity reaches 5～10 * 10 ⁸IU/mg, stronger 5～10 times than human interferon-alpha, and the high advantage of Pegylation modification rate.

Two of the object of the invention provides a kind of carbowax modifier of human interferon alpha derivative; Be that human interferon alpha derivative provided by the invention is carried out pointed decoration; Obtain the carbowax modifier of the human interferon alpha derivative of high specific; This carbowax modifier biologically active height and the characteristics that do not contain the terminal modified isomer of non-N, and transformation period prolongation in the body, advantages such as plasma clearance reduction.

Three of the object of the invention provides the preparation method of the carbowax modifier of above-mentioned human interferon alpha derivative.

Four of the object of the invention provides the pharmaceutical applications of human interferon alpha derivative of the present invention and carbowax modifier thereof.

Technical scheme of the present invention is following:

Human interferon alpha derivative connects 3 amino acid at the N-terminal of human interferon-alpha, and its structural formula is following:

R3-R2-R1-interferon

In the formula, interferon is a human interferon-alpha, and the first amino acids R1 that the N-terminal of human interferon-alpha connects is sulfur-containing amino acid or glycocoll; The second amino acids R2 is die aromatischen Aminosaeuren or glycocoll; The 3rd amino acids R3 is acidic amino acid or glycocoll.

Wherein, described human interferon-alpha comprises human interferon-alpha-2a (IFN α-2a), human interferon-alpha-1a (IFN α-1a), human interferon-alpha-1b (IFN α-1b).In addition, also comprise IFN α-2a, IFN α-1b, three kinds of proteic verivates of IFN α-1a, analogue, biological activity or medical active fragment.

Wherein, the first amino acids R1 that the N-terminal of human interferon-alpha connects is sulfur-containing amino acid or glycocoll, and sulfur-containing amino acid comprises methionine(Met), halfcystine, preferred methionine(Met) of R1 or glycocoll; The second amino acids R2 that N-terminal connects is die aromatischen Aminosaeuren or glycocoll, and die aromatischen Aminosaeuren comprises phenylalanine(Phe), tyrosine, glycocoll, preferred phenylalanine(Phe) of R2 or glycocoll; The 3rd amino acids R3 that N-terminal connects is acidic amino acid or glycocoll, and acidic amino acid comprises aspartic acid, L-glutamic acid, preferred L-glutamic acid of R3 or glycocoll.

Wherein, human interferon alpha derivative comprises Glu-Phe-Met-IFN α-2a, Glu-Phe-Met-IFN α-1b, Glu-Phe-Met-IFN α-1a, Gly-Gly-Gly-IFN α-2a, Gly-Gly-Gly-IFN α-1b, Gly-Gly-Gly-IFN α-1a, Glu-Tyr-Met-IFN α-2a, Glu-Tyr-Met-IFN α-1b, Glu-Tyr-Met-IFN α-1a, Glu-Gly-Met-IFN α-2a, Glu-Gly-Met-IFN α-1b or Glu-Gly-Met-IFN α-1a.

The present invention also provides the nucleotide sequence of the above-mentioned human interferon alpha derivative of encoding, and this nucleotide sequence formula has the nucleotide modification sequence at the N-terminal of human interferon-alpha, this modification sequence described amino acid of above-mentioned R3, R2 and R1 of can encoding successively.The preparation of above-mentioned nucleotide sequence can be through recombinant gene or synthetic acquisition of artificial full gene.Like the cDNA sequence (SEQ IDNO:2) that is used for making up the Yeast expression carrier contain Glu-Phe-Met-IFN α-2a (IFN-D) among the embodiment 1 is to obtain through full gene is synthetic.

The present invention also provides the expression vector of the nucleotide sequence that contains the above-mentioned human interferon alpha derivative of encoding.Preferred expression vector is a Yeast expression carrier, also can select other conventional expression vector.The structure of this expression vector can insert construction of expression vector in the carrier with the purpose fragment through conventional molecule clone technology.This expression vector can be in expressing engineering bacteria effective expression, can access above-mentioned human interferon alpha derivative through separation and purification.

The present invention also provides the pegylated products thereof of above-mentioned human interferon alpha derivative, is on the amino of the N-terminal of said human interferon alpha derivative, to connect activated polyglycol molecule (PEG) through amido linkage, and its structural formula is following:

Wherein, polyoxyethylene glycol has straight chain or branched structure, and molecular-weight average is 10000-40000 dalton.

Prepare the method for the pegylated products thereof of above-mentioned human interferon alpha derivative, may further comprise the steps:

(a) utilize the engineering bacteria that contains expression vector to prepare human interferon alpha derivative solution;

(b) polyoxyethylene glycol and human interferon alpha derivative linked reaction;

(c) purifying of polyoxyethylene glycol human interferon alpha derivative.

The present invention also provides above-mentioned human interferon alpha derivative and the purposes of carbowax modifier in the medicine of preparation treatment or prevention viral infection or tumor disease thereof; Above-mentioned human interferon alpha derivative and carbowax modifier thereof can be mixed with radiotherapy and/or the chemotherapy of liquid preparation combined utilization in malignant tumour with medically acceptable carrier, also can be used for treatment or prevention viral infection.Those skilled in the art can give the Pegylation human interferon alpha derivative by dosage 0.5～3 μ g/kg through injection according to practical situation.

The present invention is under the constant situation of the original aminoacid sequence of human interferon-alpha, connects 3 amino acid at the N-terminal of peptide molecule, forms human interferon alpha derivative.Human interferon alpha derivative after reorganization has the specific activity height, and antiviral specific activity reaches 5～10 * 10 ⁸IU/mg, stronger 5～10 times than human interferon-alpha, and the high advantage of Pegylation modification rate.

The contriver finds through sequential analysis: the 1st N-terminal of the α-1a of human interferon-alpha family, α-2a and α-1b is cysteine residues; Its-SH and 29 Cys-disulfide linkage formed between the SH; Thereby the peptide molecule that makes human interferon-alpha becomes curling sterie configuration; If with PEG such polypeptide N end residue is modified, its modification rate is very low, only reaches 2～5%.Through recombinant gene methionine(Met) or glycocoll on the N of human interferon-alpha termination, and linear die aromatischen Aminosaeuren or glycocoll in the 2nd connection of its extension successively, acidic amino acid or glycocoll in the 3rd connection.Because of die aromatischen Aminosaeuren has bigger sterically hinderedly, stoped terminal 3 amino acid to curl, thereby fully exposed free-NH of N end to intramolecularly ₂, help free-NH of the N end of the human interferon-alpha after PEG derives to reorganization ₂Modify, accomplish PEG N-terminal is carried out pointed decoration, obtain the polyethyleneglycol derivative of the human interferon alpha derivative of high specific.This deriving except that the proteic general advantage of PEGization such as having such as stable, good water solubility, antigenicity be low; Especially biologically active high with the characteristics that do not contain the terminal modified isomer of non-N; And transformation period prolongation in the body; Advantages such as plasma clearance reduction, and lay a solid foundation for later clinical application.

The invention provides new human interferon alpha derivative and polyoxyethylene glycol human interferon alpha derivative thereof,, can treat or prevent viral infection or tumor disease for scientific research and clinical treatment provide new drug molecule.

Description of drawings

Fig. 1 is that IFN-D Bijie Yeast expression carrier makes up synoptic diagram among the embodiment 1.

Fig. 2 is the SDS-PAGE detected result of IFN-D among the embodiment 2.Among the figure 1, Marker:SDS-PAGE lower molecular weight standard protein; 2, cross CM post target compound; 3, cross DEAE post target compound; 4, fermented liquid enriched material.

Fig. 3 is IFN-D SDS-PAGE detected result after ALD-PEG20KD modifies among the embodiment 3.Among the figure 1, Marker:SDS-PAGE lower molecular weight standard protein; 2, mPEG (20KD)-IFN-D target compound; 3, the sample of IFN-D after ALD-PEG20KD modifies; 4, IFN-D sample.

Embodiment

Below specify the present invention through embodiment.Related experiment material all can be buied or pass through the conventional preparation method in this area if no special instructions and obtained through market among the embodiment below.

The secreting, expressing of embodiment 1Glu-Phe-Met-IFN α-2a in methanol yeast

1, goal gene obtains and design

The aminoacid sequence of Glu-Phe-Met-IFN α-2a (below be called IFN-D) is shown in SEQ IDNO:1, and sequence length is 168 amino acid.

Make corresponding codon into the yeast preferences know the CDNA of IFN α-2a through Genebank after.And in N-terminal adding Glu-Phe-Met corresponding nucleotide sequence.This CDNA sequence is used for Bijie zymic PIC9K expression plasmid and makes up.The expression plasmid that makes up is realized secreting, expressing after transforming GS115 host bacterium.Therefore in design, add KEX ₂Enzyme recognition site CTC GAG AAA AGA, wherein CTC GAG is the XhoI restriction enzyme site.Two terminator codon TGA TAA of 3 ＇ end introducing and NotI enzyme are cut sequence GCG GCCGC simultaneously.SEQ ID NO:2 is the cDNA sequence that is used to make up the Yeast expression carrier of IFN-D.Described IFN-D cDNA sequence is to entrust the Shanghai total man worker of biotechnology ltd gene synthetic.This sequence flush end after checking order inserts in the pUC57 plasmid called after pUC-IFN-D.

2, the structure of two of expression plasmid pPIC9-IFN-D, pPIC9K-IFN-D kinds of different carriers.

Reclaim the purpose fragment to the goal gene among the pUC57-IFN-D with XhoI and NotI endonuclease double digestion glue, in order to connecting.

Expression vector pPIC9 plasmid is reclaimed big fragment as carrier with endonuclease XhoI and NotI double digestion, be connected with the T4 ligase enzyme with above-mentioned IFN-D fragment, 16 ℃, 30min uses CaCl again ₂Method is transformed among the E.coliDH5 α, uses the enzyme cutting method screening positive clone, called after pPIC9-IFN-D.

Reclaim big fragment to expression vector pPIC9K plasmid as carrier after with Sal I and Sac I double digestion; Reclaim small segment to the pPIC9-IFN-D plasmid as goal gene after with Sal I and Sac I double digestion again; Be connected with the T4 ligase enzyme with above-mentioned pPIC9K people's fragment, use CaCl ₂Method is transformed among the EcoliDH5 α, uses the enzyme cutting method screening positive clone, called after pPIC9K-IFN-D.

3, express the acquisition of engineering bacteria

The pPIC9K-IFN-D plasmid with linearization of Sac I after among the methanol yeast GS115 and the chosen process of positive recombinant be: (1) preparation competence GS115; (2) the plasmid pPIC9K-IFN-D of linearization of adding; (3) join behind the mixing in the conversion cup; (4) electric shock conversion condition: 0.5kv, 2.5Uf, 1500hm; (5) use 1.0ml, the 1.0M sorbyl alcohol washes out; (6) coat on the MD/His flat board, 30 ℃, grow single bacterium colony after 24 hours; (7) picking list bacterium colony separate application selects substratum (MD) or methyl alcohol to select on the substratum (MM) in glucose, and growth is mut rapidly on the MM flat board ⁺, other be that mutsc methyl alcohol slowly utilizes type; (8) renewed vaccination is to the flat board that contains aminoglycosides antibiotics G418 different concns, and the high single bacterium colony of screening number of copies is preserved subsequent use.

4, the expression of pPIC9K-IFN-D engineering bacteria

Picking mono-clonal engineering bacteria shakes in the bottle at 500ml in 25ml BMGY and cultivates on the MD flat board, and 30 ℃, the 300rpm overnight cultures.OD ₆₀₀During=4.0-6.0, with aseptic centrifuge tube 3000rpm, 4 ℃ of centrifugal supernatants that go; With 25ml BMM substratum suspension thalline, change over to and contain abduction delivering in the 250ml BMM nutrient solution, added 100% methyl alcohol in per 24 hours; Final concentration is 0.5%, 30 ℃, and 300rpm cultivated 96 hours.Cleer and peaceful deposition in the centrifugal reservation of fermented liquid.Through electrophoresis and HPLC analysis expression of results be: reorganization Glu-Phe-Met-IFN α-2a expression amount in supernatant reaches 50mg/L.

The purifying of embodiment 2IFN-D

1, positively charged ion gel column (like CM Sepharose F.F. gel) chromatography:

Adopt pH3.8～4.6 acetate buffers to carry out upper prop, wash-out, target compound is collected in the electrophoresis monitoring.Use pH7.5～8.5Tris-HC l buffered soln that target compound is dialysed then.

2, negatively charged ion gel column (like DEAE Sepharose F.F. gel) chromatography:

Adopt pH7.5～8.5Tris-HCl buffered soln to carry out upper prop, wash-out, collect target compound.With pH7.5～8.5 phosphate buffer solns target compound is dialysed again.

3, SDS-PAGE detects: get above-mentioned CM post and DEAE post pass liquid and target peak detects, test-results shows that fermented liquid passes through above column chromatography purification, has obtained purity and has reached the IFN-D more than 95%.The result sees shown in the accompanying drawing 2.

The preparation and the purifying process of sample modified in embodiment 3PEG coupling:

1, the IFN-D sample is dialysed with phosphate buffered saline buffer, add equimolar ALD-PEG20KD then and modify at 2～15 ℃, the reaction times is 24～36 hours.The modification sample that obtains is carried out SDS-PAGE detect, test-results shows that after the PEG coupling was modified, molecular weight improved, and brings up to nearly 40000 dalton by 19000 original dalton, and the modification rate reaches more than 40%, obtains target compound mPEG (20KD)-IFN-D.The result is shown in accompanying drawing 3.

2, the purifying of mPEG (20KD)-IFN-D positively charged ion gel column (like SP Sepharose F.F. gel):

To modify sample, use to regulate specific conductivity be 4.0～5.0 with termination reaction, and last SP post carries out purifying.Use acetate buffer to carry out wash-out, collect target compound.With phosphate buffer soln target compound is dialysed, get final product.

Embodiment 4 is active through the extracorporeal antivirus effect of WISH-VSV systems measurement human interferon alpha derivative IFN-D and Pegylation human interferon alpha derivative mPEG (20KD)-IFN-D

Adopt cytopathic-effect inhibition assay active through the extracorporeal antivirus effect of WISH-VSV systems measurement human interferon; Be method well-known in the art, concrete with reference to 2005 editions Pharmacopoeias of the People's Republic of China, three appendix X C " biological activity determination of human interferon ".

It is active that present embodiment has been measured the extracorporeal antivirus effect of human interferon alpha derivative IFN-D and polyoxyethylene glycol human interferon alpha derivative mPEG (20KD)-IFN-D, and its extracorporeal antivirus effect determination of activity result sees table 1 (more than be three times measure results' MV).

The extracorporeal antivirus effect of table 1 IFN α-2a, IFN-D and mPEG (20KD)-IFN-D is active

Experiment conclusion:

Human interferon alpha derivative after reorganization has the specific activity height, and antiviral specific activity reaches 5 * 10 ⁸IU/mg is stronger 5 times than human interferon-alpha.Active decline after Pegylation is modified, active reservation 20%.

Embodiment 5, survey the Plasma Concentration of polyoxyethylene glycol human interferon alpha derivative mPEG (20KD) in the mouse body-IFN-D sample with the ELISA method

1, experiment purpose:

Plasma Concentration in the survey mouse body after mPEG (20KD)-IFN-D, the metabolism of IFN-D sample different number of days.

2, experimental design and experimental technique:

Get 98 of Kunming mouses, male and female property half and half, body weight are divided into high and low two dose groups at random about 22-25g, and 42 every group, 14 of blank control group.The high dose group dosage is that mPEG (20KD)-IFN-D50 microgram/kg and low dose group dosage are IFN-D10 microgram/kg, the sample that low dose group is 10 micrograms/kg in the first day abdominal injection concentration of testing, and every day is by this dosed administration, administration 7 days.MPEG (20KD)-IFN-D sample that high dose group is 50 micrograms/kg in only first day abdominal injection concentration of experiment.Two administration experimental group were respectively taken a blood sample six from the mouse eye at the 1st, 2,3,4,5,6,7 day that tests, and adopted the blank control group blood sample simultaneously and did blank.2000 rev/mins centrifugal 5 minutes, get supernatant, survey the content of sample in the blood plasma according to the specification sheets on the ELISA test kit.(y=1.3229Ln (x)-0.0449, R2=0.9637), per sample absorbancy substitution equation is obtained concentration value again to obtain logarithmic equation according to the absorbance of standard pipe.

3, experimental result: see table 2.

Table 2 10 μ g/kg low dosage administration groups and 50 μ g/kg high dosage administration group Plasma Concentrations are relatively

4, experiment conclusion:

Plasma Concentration numerical value comparative descriptions in detecting the mouse body after mPEG (20KD)-IFN-D, the metabolism of IFN-D sample different number of days the human interferon alpha derivative pegylated products thereof can extension body in the transformation period.

More than the preparation method and the purposes of human interferon alpha derivative provided by the present invention and pegylated products thereof thereof have been done detailed introduction.It is to be noted; The described content of embodiment be for better implement the present invention preferred embodiment; Protection scope of the present invention is not limited to the described technical scheme of above-mentioned embodiment; And should be as the criterion with the described flesh and blood of claims, any possible change that those skilled in the art did is only otherwise the scope that the flesh and blood that breaks away from claim of the present invention all belongs to the present invention to be protected.

Sequence table

< 110>1, Hainan Sihuan Cardiovascular & Cerebrovascular Medicines Research Institute Company Limited; 2, Beijing Sihuan Pharmaceutical Co., Ltd; 3, Hainan Sihuan Pharmaceutical Co., Ltd

< 120>preparation of human interferon alpha derivative and pegylated products thereof thereof and purposes

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<170>PatentIn?version3.3

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<211>168

<212>PRT

<213>Homo?sapiens

<400>1

<210>2

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<212>DNA

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Claims (9)

1. human interferon alpha derivative is characterized in that, connects 3 amino acid at the N-terminal of human interferon-alpha, and its structural formula is following:

R3-R2-R1-interferon

In the formula, interferon is a human interferon-alpha, and the first amino acids R1 that the N-terminal of human interferon-alpha connects is a methionine(Met); The second amino acids R2 is a phenylalanine(Phe); The 3rd amino acids R3 is a L-glutamic acid.

2. human interferon alpha derivative according to claim 1 is characterized in that human interferon-alpha comprises human interferon-alpha-2a, human interferon-alpha-1a, human interferon-alpha-1b.

3. the dna molecular of each said human interferon alpha derivative of coding claim 1-2.

4. the expression vector that contains the said dna molecular of claim 3.

5. expression vector according to claim 4, said expression vector is a Yeast expression carrier.

6. the pegylated products thereof of each described human interferon alpha derivative of claim 1-2; It is characterized in that; On the amino of the N-terminal of said human interferon alpha derivative, connect activated polyglycol molecule (PEG) through amido linkage, its structural formula is following:

7. pegylated products thereof according to claim 6, wherein peg molecule has straight chain or branched structure, and molecular-weight average is 10000-40000 dalton.

8. the method for preparing the described pegylated products thereof of claim 6 is characterized in that may further comprise the steps:

(a) utilize the engineering bacteria that contains expression vector to prepare human interferon alpha derivative solution;

(b) polyoxyethylene glycol and human interferon alpha derivative linked reaction;

(c) purifying of polyoxyethylene glycol human interferon alpha derivative.

9. described human interferon alpha derivative of claim 1 and carbowax modifier thereof the purposes in the medicine of preparation treatment or prevention viral infection or tumor disease.

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