CA2439503A1

CA2439503A1 - Recombination super compound interferon used as hepatitis b surface antigen and e antigen inhibitor

Info

Publication number: CA2439503A1
Application number: CA002439503A
Authority: CA
Inventors: Guangwen Wei; Rongbing Guo; Renhuai Zhang
Original assignee: Individual
Current assignee: Sichuan Biotechnology Research Center
Priority date: 2001-02-28
Filing date: 2002-02-28
Publication date: 2002-10-17
Also published as: CN1311035A; US20080305080A1; JP4617058B2; WO2002080958A1; HK1061201A1; EP1371373A4; US8425896B2; AU2003248419B2; CN1245215C; JP2005508848A; AU2003248419A1; US20040202641A1; EP1371373B1; US20110189128A1; ATE446104T1; US7364724B2; DE60234085D1; US8114395B2; EP1371373A1

Abstract

The present invention relates to the use of recombination super compound interferon (rSIFN-co) as hepatitis B surface antigen and e antigen inhibitor, in which the space structure of said interferon protein has been changed.

Description

CA 02439503 2003-08-27 D~Ct. #792-PCT
RECOMBINATION SUPER COMPOUND INTERFERON USED AS HEPATITIS B
SURFACE ANTIGEN AND E ANTIGEN INHIBITOR
FIELD OF THE INVENTION
This invention is related to a recombinant super-compound interferon (rSIFN-co) with changed dimensional structure.
The characteristic of rSIFN-co in this invention is that it cannot only inhibit DNA (deoxyribonucleic acid) duplication of the hepatitis B virus but also the secretion of HBsAg and HBeAg.
BACKGROUND OF THE INVENTION
rSIFN-co is a new interferon molecule constructed with the most popular conservative amino acid found in natural human a-IFN subtypes using genetic engineering methods. United States Patent Nos. 4,695,623 and 4,897,471 have described it. rSIFN-co had been proved to have broad-spectrum IFN
activity and virus- and tumor-inhibition and natural killer cell activity. United States Patent No. 5,372,808 by Amgen, Inc. addresses treatment rSIFN-co. Chinese Patent No.
97193506.8 by Amgen, Inc. addresses re-treatment of rSIFN
co on hepatitis C. Chinese Patent No. 98114663.5 by Shenzhen Jiusheng Bio-engineering Ltd. addresses treatment of rSIFN-co on hepatitis B and hepatitis C.
The United States Food and Medicine Administration (FDA) authorized Amgen Ltd. to produce rSIFN-co with E. Coli. for clinical hepatitis C treatment at the end of 1997.
Hepatitis B patients can be identified when detecting HBsAg and the HBeAg. a-IFN is commonly used in clinics to treat hepatitis B. IFN binds superficial cell membrane receptors, inhibiting DNA and RNA (ribonucleic acid) duplication, including inducing some enzymes to prevent duplication of the virus in hepatitis-infected cells. All IFNs can inhibit only the DNA duplication of viruses, not the a and s antigen.

DETAILED DESCRIPTION OF THE INVENTION
Invention Component It was surprising to find that rSIFN-co, the dimensional structure of which has been changed, is not only a preparation to inhibit the DNA duplication of hepatitis B, but to inhibit the secretion of HBsAg and HBeAg.
The objective of this invention is to offer a preparation of rSIFN-co to inhibit the DNA duplication of hepatitis B
viruses and the secretion of HBeAg and HBsAg of hepatitis B
and decrease them to normal levels.
Results of this invention: The production of rSIFN-co with recombinant techniques. On the condition of fixed amino acid sequence, the IFN DNA was redesigned according to the E. Coli. codon usage and then the rSIFN-co gene was artificially synthesized.
rSIFN-co cDNA was cloned into the high-expression vector of E. Coli by DNA recombinant techniques, and a high expression of rSIFN-co was gained by using of induce/activate-mechanism of L-arabinose to activate the transcription of PB~ promoter.
Compared with usual thermo-induction, pH induction and IPTG
induction systems of genetic engineering, arabinose induction/activation system has some advantages: (1) Common systems relieve promoter function by creating a "derepression" pattern. Promoters then induce downstream gene expression. So temperature and pH change and the addition of IPTG cannot activate promoters directly. In the system disclosed herein, L-arabinose not only deactivates and represses but also activates the transcription of PB~
promoter which induce a high expression of rSIFN-co.
Therefore, the arabinose induction/activation system is a more effective expression system. (2) The relation between Exogenous and L-arabinose dosage is linearity. This means the concentration of arabinose can be changed to adjust the expression level of the exogenous gene. Therefore, it is easier to control the exogenous gene expression level in E.coli by arabinose than by changing temperature and pH
value. This characteristic is significant for the formation of inclusion bodies. (3) L- arabinose is resourceful cheap and safe, which, on the contrary, are the disadvantages of other inducers such as IPTG.
This invention creates an effective and resistant rSIFN-co-expressing E. Coli. engineering strain with an L-arabinose induction/activation system. The strain is cultivated and fermented under suitable conditions to harvest the bacterial bodies. Inclusion bodies are then purified after destroying bacteria and washing repeatedly. The end result, mass of high-purity, dimensional-structure-changed rSIFN-co protein for this invention and for clinical treatment, was gained from denaturation and renaturation of inclusion bodies and a series of purification steps.
The following are some rSIFN-co preparations: tablets, capsules, oral liquids, pastes, injections, sprays, suppositories, and solutions. Injections are recommended.
It is common to subcutaneously inject or vein-inject the medicine. The medicine carrier could be any acceptance medicine carrier, including carbohydrate, cellulosum, adhesive, collapse, emollient, filling, add-dissolve agent, amortization, preservative, add-thick agent, matching, etc.
DETAILED DESCRIPTION OF THE FIGURE
Figure 1. DNA coding sequence and deduced amino acid sequence of rSIFN-co EXPERIMENTAL DETAILS
Embodiment experience:
The invention disclosed herein also experimentally verifies that the dimensional-structure-changed rSIFN-co can inhibit HBV-DNA duplication and secretion of HBsAg and HBeAg.
Materials Solvent and Dispensing Method: Add lml saline into each vial, dissolve, and mix with MEM culture medium at different concentrations. Mix on the spot.
Control drugs: IFN-a2b (Intron A) as lyophilized, purchased from Schering Plough. 3x106U each, mix to 3x106IU/ml with culture medium; INFERGEN (liquid solution) , purchased from Amgen, 9~g, 0.3m1 each, equal to 9X106IU, and mix with 9X106IU/ml culture medium preserve at 4°C; 2.2.15 cell:
2.2.15 cell line of hepatoma (Hep G2) cloned and transfected by HBV DNA, constructed by Mount Sinai Medical Center.
Reagent: MEM powder, Gibco American Ltd. cattle fetal blood serum, HycloneLab American Ltd. G-418(Geneticin); MEM
dispensing, Gibco American Ltd.; L-Glutamyl, imported and packaged by JING KE Chemical Ltd.; HBsAg and HBeAg solid-phase radioimmunoassay box, Northward Reagent Institute of Chinese Isotope Ltd.; Biograncetina, Northern China Medicine; And Lipofectin, Gibco American Ltd.
Experimental goods and equipment: culture bottle, Denmark TunclonT"'; 24-well and 96-well culture board, Corning American Ltd.; Carbon Dioxide hatching box, Shel-Lab American Ltd.; MEM culture medium 100m1: 10% cattle fetal blood serum, 3% Glutamyll%, 6418 380~g/ml, biograncetina50U/ml.
Method:
2.2.15 cell culture: Added 0.25% pancreatic enzyme into culture box with full of 2.2.15 cell, digest at 37°C for 3 minutes, and add culture medium to stop digest and disturb it to disperse the cells, reproduce with ratio of 1:3. They will reach full growth in 10 days.
Medicine toxicity test: In this test, set groups of different medicine concentrations and a control group in which cell is not acted on with medicine. Digest cell, and dispense to a 100,000 cell/ml solution. Inoculate to 96-well culture board, 200.1 each well, culture at 37°C for 24h with 5o CO2. Test when simple cell layer grows.
Dispense rSIFN-co to 1.8x10'IU/ml solution than prepare a series of solutions diluted at two-fold gradients. Add into 96-well culture board, 3 wells per concentration. Change the solution every 4 days. Test cytopathic effect by microscope after 8 days. Fully destroy as 4, 75% as 3, 50%
as 2, 25% as 1, zero as 0. Calculate average cell lesion and inhibition rate of different concentrations. Calculate TC50 and TCO according to the Reed Muench method.
TC50 = Antilog (B + ~-B x C) A=log >50 ~ medicine concentration, B=log<50 Omedicine concentration, C=log dilution power Inhibition test for HBeAg and HBsAg: Separate into positive and negative HBeAg and HBsAg contrast groups, cell contrast group and medicine concentration groups. Inoculate 700,000 cells/ml of 2.2.15 cell into 6-well culture board, 3 ml each well, culture at 37°C for 24h with 5% COz, then prepare 5 gradiently diluted solutions with 3-fold as the grade (Prepare 5 solutions, each with a different protein concentration. The concentration of Solution 2 is 3 times lower than that of Solution l, the concentration of Solution 3 is 3 times lower than that of Solution 2, etc.) 4.5x106IU/ml, 1.5x106IU/ml, 0.5x106IU/ml, 0.17x1061U/ml, and 0.056x1061U/ml, 1 well per concentration, culture at 37°C
for 24h with 5% CO2. Change solutions every 4 days using the same solution. Collect all culture medium on the 8th day.
Preserve at -20°C Repeat test 3 times to estimate HBsAg and HBeAg with solid-phase radioimmunoassay box (Northward Reagent Institute of Chinese Isotope Ltd.). Estimate cpm value of each well with a 'y- accounting machine.
Medicinal effects calculation: Calculate cpm mean value of contrast groups and different-concentration groups and their standard deviation, P/N value such as inhibition rate, IC50 and SI.

A-B
1) Antigen inhibition rate (%) - A x 100 A = cpm of control group; B = cpm of test group;
2) Counting the half-efficiency concentration of the medicine Antigen inhibition IC50 = Antilog (B + A - B x C) A=log>50% medicine concentration, B=log<500medicine concentration, C=log dilution power 3) SI of interspace-conformation changed rSIFN-co effect on HBsAg and HBeAg in 2.2.15 cell culture:
SI -T~sn ll.J U
4) Estimate the differences in cpm of each dilution degree from the control group using student t test Southern blot: (1) HBV-DNA extract in 2.2.15 cell: Culture cell 8 days. Exsuction culture medium (Separate cells from culture medium by means of draining the culture medium.).
Add lysis buffer to break cells, then extract 2 times with a mixture of phenol, chloroform and isoamyl alcohol (1:1:1), 10,0008 centrifuge. Collect the supernatant adding anhydrous alcohol to deposit nucleic acid. Vacuum draw, re-dissolve into 20~,1TE buffer. (2) Electrophoresis: Add 6XDNA
loading buffer, electrophoresis on 1.5% agarose gel, IV/cm, at fixed pressure for 14-18h. (3) Denaturation and hybridization: respectively dip gel into HC1, denaturaion buffer and neutralization buffer. (4) Transmembrane: Make an orderly transfer of DNA to Hybond-N membrane. Bake, hybridize and expose with dot blot hybridization. Scan and analyze relative density with gel-pro software. Calculate inhibition rate and IC50.
Results Results from Tables 1, 2 and 3 show: After maximum innocuous concentration exponent culturing for 8 days with 2.2.15 cell, the maxima is 9.0~Ox106IU/ml and the average - 7 _ inhibition rate of maximum innocuous concentration rSIFN-co to HBeAg is 46.0~5.25a (P<0~001), IC50 is 4.54~1.32X106IU/ml, SI is 3.96; rate to HBsAg is 44.8~ 6.6%, IC50 is 6.49~0.42x106IU/ml, SI is 2.77. This shows that rSIFN-co can significantly inhibit the activity of HBeAg and HBsAg, but that the IFN of the contrast group and INFERGEN cannot. It has also been proved in clinic that rSIFN-co can decrease HBeAg and HBsAg or return them to normal levels.

The following are some examples for the preparation of rSIFN-co:
Example 1: Preparation of lyophilized injection a) rSIFN-co 3 x 106 IU
b) citric acid 0.2 mg c) dibasic sodium phosphate 2.5 mg d) NaCl 4.0 mg e) dextran 20 mg f) Polyoxyethelene anhydrosorbitol monoelaeo-acids ester 0.1 ml g) inject water to a level of 1.0 ml Preparation technique: Weigh materials according to recipe.
Dissolve with sterile and pyrogen-free water. Filter through 0.22~m membrane to de-bacterialize, preserve at 6 10°C. Fill in vials after affirming it is sterile and pyrogen-free. Add 1.0 ml solution to each bottle, and lyophilize in freeze dryer.
Example 2: Preparation of liquid injection a) rSIFN-co 3 x 106 IU
b) citric acid 0.2 mg c) dibasic sodium phosphate 2.5 mg d) NaCl 4.0 mg e) dextran 20 mg f) Polyoxyethelene anhydrosorbitol monoelaeo-acids ester 0 . 1 ml _ g _ g) inject water to a level of 1.0 ml Preparation technique: Weigh materials according to recipe.
Dissolve with sterile and pyrogen-free water. Filter through 0.22~m membrane to de-bacterialize, preserve at 6-10°C. Fill in airtight vial after affirming it is sterile and non-pyrogen at 1.0 ml per vial. Store end product at 2-10°C, and protect from light.

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Claims

What is claimed is:

1. A recombinant super-compound interferon (rSIFN-co) with changed 3-dimensional structure and improved efficacy which can inhibit the DNA duplication and secretion of HBsAg and HBeAg of HBV.

2. The interferon of claim 1, wherein the 3-dimensional change was the result of changes of its production techniques, and efficacy gains not seen in interferon described in U.S. Patent Nos. 4,695,623 and 4,897,471.

3. A super-compound interferon of claim 1 or claim 2, wherein it has its unique secondary and tertiary structure which elicit its special efficacies.

4. A super-compound interferon of claim 1 or claim 2, produced by a highly efficient express system which is constructed with a special promoter.

5. The super-compound interferon of claim 4, wherein the promoter is P BAD.

6. The super-compound interferon of claim 4, wherein its gene is artificially synthesized cDNA, adjusted according to codon preference of E. Coli.

7. A process for production of recombinant super-compound interferon recited in claim 1 or 2.

8. The process for production of claim 7, comprising extraction of super-compound interferon from fermentation broth, collection of inclusion body, denaturation and renaturation of the harvested protein.

9. The process of claim 7, wherein the process maintains the high efficacy even when the super-compound interferon is used with an agent and in a particular concentration.

10. The process of claim 7, comprising separation and purification of the super-compound interferon.

11. The process of claim 7, comprising lyophilization of purified super-compound interferon.

12. The process of claim 7, comprising production of liquid injection of super-compound interferon.

13. Uses of super-compound interferon in preparing medicines for inhibition of HBV-DNA, HBsAg and HBeAg, wherein the virus diseases comprising hepatitis A, hepatitis B, hepatitis C, other types of hepatitis, infections of viruses such as: Epstein-Barr virus, HIV, herpes viruses (Epstein-Barr virus, Cytomegalovirus, herpes simplex viruses), papovaviruses, poxviruses, picornaviruses, adenoviruses, rihnoviruses, human T cell leukaemia viruses I, or human T cell leukaemia viruses II.

14. Uses of claim 1 and 2, wherein the super-compound interferon selected for interferon is .alpha., .beta., .gamma. such as, IFN-1a, IFN-2b or other mutants.

15. Uses of claim 13, wherein super-compound interferon was administered via oral, vein injection, muscle injection, subcutaneous injection, nasal, or mucosal administration.

16. Uses of claim 13, wherein super-compound interferon was administered following the protocol as follows:
injection 9 µg or 15 µg per day, 3 times a week, total 24 weeks.