CN113651883B - Humanized anti-HAdV-B7 monoclonal neutralizing antibody, preparation method and application thereof - Google Patents
Humanized anti-HAdV-B7 monoclonal neutralizing antibody, preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a humanized anti-HAdV-B7 monoclonal neutralizing antibody, a preparation method and application thereof. The gene sequence of the encoding humanized anti-HAdV-B7 monoclonal neutralizing antibody comprises the sequence of heavy chain variable region and the sequence of light chain variable region, wherein the gene sequence of the heavy chain variable region is shown as SEQ ID NO.1, and the gene sequence of the light chain variable region is shown as SEQ ID NO. 2. The humanized anti-HAdV-B7 monoclonal neutralizing antibody can solve the problem of human immunological rejection caused by the murine anti-HAdV-B7 monoclonal neutralizing antibody.
Description
Technical Field
The invention relates to the technical field of biology, in particular to a humanized anti-HAdV-B7 monoclonal neutralizing antibody, a preparation method and application thereof.
Background
HAdV is a common respiratory virus, and severe pneumonia caused by infection of HAdV is one of the important causes of death and disability of children. It has been reported in the literature that up to 13.3% of severe pneumonia infants are caused by HAdV infection. B types of HAdV are the most prominent type of infection in children with severe HAdV pneumonia, of which the B types of infection with HAdV 7 (HAdV-B7) are more likely to cause severe pneumonia in children with higher mortality. There is currently no effective method for preventing and treating HAdV pneumonia. The broad-spectrum antiviral drug cidofovir has a certain curative effect on early-stage HAdV infection, but has no obvious curative effect on HAdV pneumonia. Foreign scholars try to find new anti-HAdV chemical drugs, but no major breakthrough is made yet.
The antiviral monoclonal neutralizing antibody has high specificity and obvious antiviral effect, plays an important role in the prevention and treatment of viruses, and brings hope for the prevention and treatment of HAdV infection. At present, monoclonal neutralizing antibodies against HAdV-B7 have been reported to be murine. Practice proves that after entering human body, the murine antibody causes immunological rejection reaction of the body immune system to the heterologous protein, generates human anti-mouse antibody (HAMA) reaction, can accelerate the removal of the murine antibody, even causes anaphylactic shock, and is eliminated.
Disclosure of Invention
Therefore, the humanized anti-HAdV-B7 monoclonal neutralizing antibody, a preparation method and application thereof are needed to solve the problem that the murine anti-HAdV-B7 monoclonal neutralizing antibody causes human immune rejection.
A humanized anti-HAdV-B7 monoclonal neutralizing antibody, the gene sequence of the coded antibody comprises the sequence of heavy chain variable region and the sequence of light chain variable region, the gene sequence of the heavy chain variable region is shown as SEQ ID NO.1, and the gene sequence of the light chain variable region is shown as SEQ ID NO. 2.
In some of these embodiments, the heavy chain variable region comprises a heavy chain complementarity determining region and a heavy chain framework region;
wherein the heavy chain complementarity determining region comprises: heavy chain CDR1 shown in SEQ ID NO.3, heavy chain CDR2 shown in SEQ ID NO.4 and heavy chain CDR3 shown in SEQ ID NO. 5; the heavy chain framework region comprises a heavy chain FR1 shown in SEQ ID NO.6, a heavy chain FR2 shown in SEQ ID NO.7, a heavy chain FR3 shown in SEQ ID NO.8 and a heavy chain FR4 shown in SEQ ID NO. 9.
In some of these embodiments, the light chain variable region comprises a light chain complementarity determining region and a light chain framework region;
wherein the light chain complementarity determining region comprises: light chain CDR1 shown in SEQ ID NO.10, light chain CDR2 shown in SEQ ID NO.11 and light chain CDR3 shown in SEQ ID NO. 12; the light chain framework region comprises a light chain FR1 shown in SEQ ID NO.13, a light chain FR2 shown in SEQ ID NO.14, a light chain FR3 shown in SEQ ID NO.15 and a light chain FR4 shown in SEQ ID NO. 16.
In some embodiments, the heavy chain variable region has the amino acid sequence set forth in SEQ ID No. 17.
In some of these embodiments, the light chain variable region has the amino acid sequence set forth in SEQ ID No. 18.
It is also an object of the present invention to provide a nucleic acid molecule.
A nucleic acid molecule encoding the heavy chain variable region and/or the light chain variable region of the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
It is also an object of the present invention to provide a recombinant vector.
A recombinant vector comprising said nucleic acid molecule.
The invention also aims to provide a preparation method of the recombinant vector.
The preparation method of the recombinant vector comprises the following steps:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibodies by using a hybridoma technology, and carrying out expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification;
connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
After extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid respectively, cotransfecting the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, and then detecting the neutralizing activity of the chimeric antibody anti-HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, collecting cell culture supernatant, separating and purifying the chimeric antibody, concentrating the chimeric antibody, and determining the concentration of the chimeric antibody;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a murine antibody, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a light chain variable region of the murine antibody, and replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the heavy chain variable region of the murine antibody with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a human antibody respectively to construct a heavy chain variable region of the humanized antibody; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, and connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector;
(8) expression of humanized antibody and detection of neutralizing Activity thereof
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-transfecting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector, and identifying.
It is also an object of the present invention to provide a recombinant cell.
A recombinant cell expressing said humanized anti-HAdV-B7 monoclonal neutralizing antibody,
it is also an object of the present invention to provide a recombinant cell.
A recombinant cell having said nucleic acid molecule integrated into its genome.
It is also an object of the present invention to provide a recombinant cell.
A recombinant cell comprising said recombinant vector.
It is also an object of the present invention to provide a method for producing a recombinant cell.
A method for preparing the recombinant cell comprises the following steps:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibody by using hybridoma technology, and performing expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification;
connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
Respectively extracting mouse-derived antibody heavy chain variable region gene fragment expression plasmids and mouse-derived antibody light chain variable region gene fragment expression plasmids, co-transforming the mouse-derived antibody heavy chain variable region gene fragment expression plasmids and the mouse-derived antibody light chain variable region gene fragment expression plasmids, and then detecting the neutralizing activity of the chimeric antibody anti-HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, collecting cell culture supernatant, separating and purifying the chimeric antibody, concentrating the chimeric antibody, and determining the concentration of the chimeric antibody;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a murine antibody light chain variable region, replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a human antibody heavy chain variable region, respectively, and constructing a humanized antibody heavy chain variable region; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, and connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector;
(8) expression of humanized antibody and detection of neutralizing Activity thereof
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-transfecting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the chimeric antibody, and detecting the neutralizing activity of the chimeric antibody against HAdV-B7;
(9) expression and purification of humanized antibodies
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-suspending and transfecting cells by respectively extracting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the humanized antibody, and measuring the concentration after concentration;
(10) the neutralizing activity of the humanized antibody against HAdV-B7 was tested.
The invention also aims to provide a pharmaceutical composition.
A pharmaceutical composition comprising said humanized anti-HAdV-B7 monoclonal neutralizing antibody.
In some embodiments, the pharmaceutical composition further comprises at least one of a pharmaceutically acceptable carrier, diluent, or excipient.
The invention also aims to provide the application of the humanized anti-HAdV-B7 monoclonal neutralizing antibody in preparing a diagnostic kit for detecting HAdV-B7.
The invention also aims to provide a severe pneumonia virus diagnosis kit.
A severe pneumonia virus diagnostic kit comprises the humanized anti-HAdV-B7 monoclonal neutralizing antibody, and the severe pneumonia virus is HAdV-B7.
In some embodiments, the severe pneumonia virus diagnostic kit employs enzyme-linked immunosorbent assay, chemiluminescence immunoassay, or immunochromatography.
It is another object of the present invention to provide a method for preparing a humanized anti-HAdV-B7 monoclonal neutralizing antibody.
A method for preparing the humanized anti-HAdV-B7 monoclonal neutralizing antibody comprises the following steps:
culturing a recombinant cell, and separating and purifying the culture product to obtain the humanized anti-HAdV-B7 monoclonal neutralizing antibody, wherein the recombinant cell contains a recombinant vector which contains a nucleic acid sequence for encoding the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
The humanized anti-HAdV-B7 monoclonal neutralizing antibody is successfully expressed and purified. The neutralizing ratio of the humanized anti-HAdV-B7 monoclonal neutralizing antibody in unit concentration is higher than that of the chimeric antibody, the higher the neutralizing ratio in unit concentration is, the stronger the activity is, and the neutralizing activity of the antibody is improved by the humanized modification of the murine antibody. After 4608-fold dilution of humanized anti-HAdV-B7 monoclonal neutralizing antibody, the concentration of 0.03 mu g/mL can inhibit cytopathic effect (CPE) generated by 80% of cells. The humanized modification of the murine antibody enables the original murine components to be mostly replaced by the human components, thereby avoiding the occurrence of HAMA reaction, and therefore, the humanized anti-HAdV-B7 monoclonal neutralizing antibody is safer to use.
Drawings
FIG. 1 is a schematic electrophoresis diagram of a humanized anti-HAdV-B7 monoclonal neutralizing antibody according to example 1 of the present invention;
FIG. 2 is a schematic representation of the effect of the humanized anti-HAdV-B7 monoclonal neutralizing antibody on HAdV-B7 as described in example 1 of the present invention.
Detailed Description
In order that the invention may be more readily understood, reference will now be made to the following more particular description of the invention, examples of which are set forth below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete. It is to be understood that the experimental procedures in the following examples, where specific conditions are not noted, are generally in accordance with conventional conditions, or with conditions recommended by the manufacturer. The various reagents used in the examples are commercially available.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the application provides a humanized anti-HAdV-B7 monoclonal neutralizing antibody, wherein the gene sequence of the coded antibody comprises a heavy chain variable region sequence and a light chain variable region sequence, the gene sequence of the heavy chain variable region is shown as SEQ ID NO.1, and the gene sequence of the light chain variable region is shown as SEQ ID NO. 2.
In some of these embodiments, the heavy chain variable region comprises a heavy chain complementarity determining region and a heavy chain framework region;
wherein the heavy chain complementarity determining region comprises: heavy chain CDR1 shown in SEQ ID NO.3, heavy chain CDR2 shown in SEQ ID NO.4 and heavy chain CDR3 shown in SEQ ID NO. 5; the heavy chain framework region comprises a heavy chain FR1 shown in SEQ ID NO.6, a heavy chain FR2 shown in SEQ ID NO.7, a heavy chain FR3 shown in SEQ ID NO.8 and a heavy chain FR4 shown in SEQ ID NO. 9.
In some of these embodiments, the light chain variable region comprises a light chain complementarity determining region and a light chain framework region;
wherein the light chain complementarity determining region comprises: light chain CDR1 shown in SEQ ID NO.10, light chain CDR2 shown in SEQ ID NO.11 and light chain CDR3 shown in SEQ ID NO. 12; the light chain framework region comprises a light chain FR1 shown in SEQ ID NO.13, a light chain FR2 shown in SEQ ID NO.14, a light chain FR3 shown in SEQ ID NO.15 and a light chain FR4 shown in SEQ ID NO. 16.
In some embodiments, the heavy chain variable region has the amino acid sequence set forth in SEQ ID No. 17.
In some of these embodiments, the light chain variable region has the amino acid sequence set forth in SEQ ID No. 18.
In another embodiment, the invention also provides a nucleic acid molecule.
A nucleic acid molecule encoding the heavy chain variable region and/or the light chain variable region of the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
The invention also provides a recombinant vector.
A recombinant vector comprising said nucleic acid molecule.
The invention also provides a preparation method of the recombinant vector.
The preparation method of the recombinant vector comprises the following steps:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibody by using hybridoma technology, and performing expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification;
connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
After extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid respectively, cotransfecting the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, and then detecting the neutralizing activity of the chimeric antibody anti-HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, collecting cell culture supernatant, separating and purifying the chimeric antibody, concentrating the chimeric antibody, and determining the concentration of the chimeric antibody;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a murine antibody, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a light chain variable region of a murine antibody, and replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the heavy chain variable region of the murine antibody with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a human antibody, respectively, so as to construct a humanized antibody heavy chain variable region; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, and connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector;
(8) expression of humanized antibody and detection of neutralizing Activity thereof
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-transfecting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector, and identifying.
In another embodiment of the invention, a recombinant cell is provided.
A recombinant cell expressing said humanized anti-HAdV-B7 monoclonal neutralizing antibody,
in another embodiment of the invention, a recombinant cell is provided.
A recombinant cell having said nucleic acid molecule integrated into its genome.
In another embodiment of the invention, a recombinant cell is provided.
A recombinant cell comprising said recombinant vector.
The invention also provides a preparation method of the recombinant cell.
A method for preparing the recombinant cell comprises the following steps:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibody by using hybridoma technology, and performing expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification;
connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
Respectively extracting mouse-derived antibody heavy chain variable region gene fragment expression plasmids and mouse-derived antibody light chain variable region gene fragment expression plasmids, co-transforming the mouse-derived antibody heavy chain variable region gene fragment expression plasmids and the mouse-derived antibody light chain variable region gene fragment expression plasmids, and then detecting the neutralizing activity of the chimeric antibody anti-HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting mouse-derived antibody heavy chain variable region gene fragment expression plasmids and mouse-derived antibody light chain variable region gene fragment expression plasmids, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmids and the mouse-derived antibody light chain variable region gene fragment expression plasmids, collecting cell culture supernatant, separating and purifying the chimeric antibody, concentrating the chimeric antibody, and determining the concentration of the chimeric antibody;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a murine antibody, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a light chain variable region of the murine antibody, and replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the heavy chain variable region of the murine antibody with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a heavy chain variable region of a human antibody respectively to construct a heavy chain variable region of the humanized antibody; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, and connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector;
(8) expression of humanized antibody and detection of neutralizing Activity thereof
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-transfecting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the chimeric antibody, and detecting the neutralizing activity of the chimeric antibody against HAdV-B7;
(9) expression and purification of humanized antibodies
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-suspending and transfecting cells by respectively extracting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the humanized antibody, and measuring the concentration after concentration;
(10) the neutralizing activity of the humanized antibody against HAdV-B7 was examined.
The invention also provides a pharmaceutical composition.
A pharmaceutical composition comprising said humanized anti-HAdV-B7 monoclonal neutralizing antibody.
In some embodiments, the pharmaceutical composition further comprises at least one of a pharmaceutically acceptable carrier, diluent, or excipient.
The invention also provides the application of the humanized anti-HAdV-B7 monoclonal neutralizing antibody in the preparation of a diagnostic kit for detecting HAdV-B7.
The invention also provides a severe pneumonia virus diagnosis kit.
A severe pneumonia virus diagnostic kit comprises the humanized anti-HAdV-B7 monoclonal neutralizing antibody, and the severe pneumonia virus is HAdV-B7.
In some embodiments, the severe pneumonia virus diagnostic kit employs enzyme-linked immunosorbent assay, chemiluminescence immunoassay, or immunochromatography.
Another embodiment of the invention also provides a method for preparing the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
A method for preparing the humanized anti-HAdV-B7 monoclonal neutralizing antibody comprises the following steps:
culturing a recombinant cell, and separating and purifying the culture product to obtain the humanized anti-HAdV-B7 monoclonal neutralizing antibody, wherein the recombinant cell contains a recombinant vector which contains a nucleic acid sequence for encoding the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
Example 1
A method for preparing the recombinant cell comprises the following steps:
(1) recovery and culture of hybridoma cells
Hybridoma cells (3G 5) secreting monoclonal neutralizing antibody against HAdV-B7 of murine origin are prepared by using hybridoma technology, and after the cells are cryopreserved by using liquid nitrogen and recovered by using a water bath at 37 ℃ (3G 5), the cells are subjected to amplification culture in a 37 ℃ incubator containing 5% CO2 by using 1640 medium containing 10% fetal bovine serum and 1% double antibody.
(2) Amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: total RNA from hybridoma cells (3G 5) was extracted using EasyPure RNA Kit (Beijing all gold Biotech Co., Ltd.).
(2.2) reverse transcription: using TransScript II All-in-One First-Strand cDNA Synthesis Supermix for PCR (Beijing All gold Biotechnology Co., Ltd.), the extracted total RNA was reverse transcribed to synthesize cDNA.
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by using the synthesized cDNA as a template and PrimeSTAR HS DNA Polymerase with GC Buffer (Takara), wherein the 50 mu L reaction system comprises: mu.L of cDNA, PrimeSTAR HS DNA Polymerase, 2 XPrimeSTAR GC Buffer, dNTP mix, 10. mu.M mixed primers for heavy chain variable region and light chain variable region of each subtype of murine antibody; reaction system: 10sec at 98 ℃, 5sec at 60 ℃, 1min at 72 ℃ and 30 cycles. After the reaction solution was subjected to 1% agarose Gel electrophoresis, murine antibody heavy chain variable region gene fragments and murine antibody light chain variable region gene fragments were recovered using QIAquick Gel extraction Kit (Qiagen), respectively.
(3) Construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
The recovered heavy chain variable region gene fragment of the murine antibody is connected to an expression vector pFUSEs-CHIg-hG 1, transformed and identified, and the connection product is transformed into DH5 alpha competent bacteria and cultured on a LLB plate containing Zeocin overnight. Individual colonies were picked, inoculated into LLB medium containing Zeocin, and cultured overnight at 37 ℃. After extracting the Plasmid using the Plasmid Mini Kit (Omega), gene sequencing was performed to determine the expression vector of the murine antibody heavy chain variable region gene.
The recovered murine antibody light chain variable region gene fragment was ligated to pFUSE2ss-CLIg-hk expression vector, identified by transformation, and the ligation product was transformed into DH 5. alpha. competent bacteria and cultured overnight on Blastidin-containing LLB plates. Individual colonies were picked, inoculated into LLB medium containing Blastidin, and cultured overnight at 37 ℃. After extracting the Plasmid using the Plasmid Mini Kit (Omega), gene sequencing was performed to determine the murine antibody light chain variable region gene expression vector.
(4) Expression of chimeric antibodies and detection of neutralizing Activity thereof
After extracting the mouse antibody heavy chain variable region gene fragment expression Plasmid and the mouse antibody light chain variable region gene fragment expression Plasmid respectively by using the Endo-Free Plasmid Mini Kit (Omega), the mouse antibody heavy chain variable region gene fragment expression Plasmid and the mouse antibody light chain variable region gene fragment expression Plasmid are co-transfected into Expicho cells by using TransIntro EL transformation Reagent (Beijing all-gold Biotechnology Co., Ltd.), cell culture supernatant is collected after 7 days, and then the neutralizing activity of the chimeric antibody against HAdV-B7 is detected.
(5) Expression and purification of chimeric antibodies
The murine antibody heavy chain variable region gene fragment expression Plasmid and the murine antibody light chain variable region gene fragment expression Plasmid were respectively extracted using the Endo-Free Plasmid Maxi Kit (Omega), the murine antibody heavy chain variable region gene fragment expression Plasmid and the murine antibody light chain variable region gene fragment expression Plasmid were co-suspended to transfect ExpiCHO cells using transIntro EL Transfection Reagent (Beijing all-gold Biotechnology Co., Ltd.), feeding was added every other day, cell culture supernatant was collected after 7 days, then the chimeric antibody was separated and purified using Protein G purification medium, and the chimeric antibody was concentrated using a 50kDa ultrafiltration tube to determine the concentration of the chimeric antibody.
(6) Detection of neutralizing Activity of chimeric antibodies
Neutralization of HAdV-B7 by the chimeric antibody was tested using a flow cytometry-based neutralization assay.
(7) Humanization engineering
Analyzing the chimeric antibody heavy chain variable region and the chimeric antibody light chain variable region by using MOE software, determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the murine antibody heavy chain variable region, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the murine antibody light chain variable region, and replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the murine antibody heavy chain variable region with heavy chain FR 6353, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of the murine antibody heavy chain variable region respectively to construct a humanized antibody heavy chain variable region; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; the humanized antibody heavy chain variable region gene is connected to an expression vector pFUSEs-CHIg-hG 1 to construct a humanized antibody heavy chain variable region gene expression vector, and the humanized antibody kappa light chain variable region gene is connected to an expression vector pFUSE2ss-CLIg-hk to construct a humanized antibody light chain variable region gene expression vector.
(8) Expression of humanized antibody and detection of neutralizing Activity thereof
Humanized antibody heavy chain variable region gene expression vector and humanized antibody light chain variable region gene expression vector were extracted separately with Endo-Free Plasmid Mini Kit (Omega), and then transfected with humanized antibody heavy chain variable region gene expression vector and humanized antibody light chain variable region gene expression vector into ExpCHO cells with TransIntro EL Transfection Reagent (Beijing all-terrain gold Biotechnology Co., Ltd.) to obtain recombinant cells, and after 7 days, recombinant cell culture supernatant was collected, and chimeric antibody was isolated and purified, and the neutralizing activity of chimeric antibody against HAdV-B7 was examined.
(9) Expression and purification of humanized antibodies
Humanized antibody heavy chain variable region gene expression vectors and humanized antibody light chain variable region gene expression vectors were extracted using the Endo-Free Plasmid Maxi Kit (Omega), respectively, and humanized antibody heavy chain variable region gene expression vectors and humanized antibody light chain variable region gene expression vectors were co-suspension transfected into expihcho cells using TransIntroTM EL Transfection Reagent (beijing hologold biotechnology limited), respectively, to obtain recombinant cells. Culturing the recombinant cells, adding supplementary materials every other day, collecting recombinant cell culture supernatant after 7 days, separating and purifying the humanized antibody by using Protein G purification medium, concentrating the humanized antibody by using a 50kDa ultrafiltration tube, and measuring the concentration to obtain the humanized anti-HAdV-B7 monoclonal neutralizing antibody.
(10) Detection of the neutralizing Activity of the humanized anti-HAdV-B7 monoclonal neutralizing antibody
The neutralization of the humanized anti-HAdV-B7 monoclonal neutralizing antibody was tested using a microcentrifugation assay, as follows: diluting the humanized anti-HAdV-B7 monoclonal neutralizing antibody to be detected on a 96-well plate, taking 1:9 as an initial concentration, diluting the humanized anti-HAdV-B7 monoclonal neutralizing antibody to 1:2304 by 4 times, and setting 5 dilutions in total, wherein each dilution contains 165 mu L of diluted humanized anti-HAdV-B7 monoclonal neutralizing antibody; adding 165 μ L diluted HAdV-B7 (200 TCID50/0.1mL, GenBank: GQ 478341.1) to each dilution, mixing, and incubating at 37 deg.C in a 5% CO2 incubator for 1 h; removing growth liquid of cells which grow in a 96-well plate in a single-layer adherent manner and have the cell density of 80%, adding 100 mu L of a mixture of a humanized anti-HAdV-B7 monoclonal neutralizing antibody and HAdV-B7 into each well, setting 3 multiple wells for each dilution, simultaneously setting virus control and blank control, and adsorbing for 2h in an incubator containing 5% CO2 at 37 ℃; discarding the humanized anti-HAdV-B7 monoclonal neutralizing antibody and HAdV-B7 mixture, supplementing 100. mu.L DMEM/F-12 to each well, and culturing in a 5% CO 2-containing incubator at 37 ℃ for 3 days; CPE was observed.
The neutralizing effect of humanized anti-HAdV-B7 monoclonal neutralizing antibody on HAdV-B7 was tested using a flow cytometry-based neutralization assay. The method comprises the following steps: the humanized anti-HAdV-B7 monoclonal neutralizing antibody dilution procedure was the same as the microneutralization test; adding 165 mu L of diluted HAdV-B7 (18-20% of cells express EGFP/0.1 ml) expressing Enhanced Green Fluorescent Protein (EGFP) into each dilution, mixing uniformly, and incubating for 1h in an incubator containing 5% CO2 at 37 ℃; carrying out adherent growth on a monolayer in a 96-well plate, discarding a growth solution of cells with the cell density of 90%, adding 100 mu L of a humanized anti-HAdV-B7 monoclonal neutralizing antibody and HAdV-B7 mixed solution for expressing EGFP into each well, setting 3 multiple wells for each dilution, setting virus control and blank control at the same time, and adsorbing for 2h in an incubator containing 5% CO2 at 37 ℃; discarding the humanized anti-HAdV-B7 monoclonal neutralizing antibody and EGFP-expressing HAdV-B7 mixture, supplementing 100. mu.L DMEM/F-12 per well, and culturing in a 5% CO 2-containing incubator at 37 ℃ for 3 days; the strength of the neutralizing activity of the humanized anti-HAdV-B7 monoclonal neutralizing antibody and the chimeric antibody is compared by calculating the neutralizing ratio per unit concentration, and the calculation formula is as follows:
neutralization ratio in unit concentration = (virus to fluorescent cell ratio-sample fluorescent cell ratio)/sample concentration.
As shown in FIG. 1, this example successfully expressed and purified a humanized anti-HAdV-B7 monoclonal neutralizing antibody.
The results from table 1 show that: the neutralizing ratio of the humanized anti-HAdV-B7 monoclonal neutralizing antibody in unit concentration is higher than that of the chimeric antibody, the higher the neutralizing ratio in unit concentration is, the stronger the activity is, and the neutralizing activity of the antibody is improved by the humanized modification of the murine antibody.
TABLE 1 results of the neutralization activities of the humanized anti-HAdV-B7 monoclonal neutralizing antibody and the chimeric antibody
Mean of 3 multiple wells
As shown in FIG. 2, after 4608-fold dilution of humanized anti-HAdV-B7 monoclonal neutralizing antibody, the concentration was 0.03. mu.g/mL, which inhibited CPE production by 80% of the cells.
In conclusion, the humanized anti-HAdV-B7 monoclonal neutralizing antibody was successfully expressed and purified in the present invention. The neutralizing ratio of the humanized anti-HAdV-B7 monoclonal neutralizing antibody in unit concentration is higher than that of the chimeric antibody, the higher the neutralizing ratio in unit concentration is, the stronger the activity is, and the neutralizing activity of the antibody is improved by the humanized modification of the murine antibody. After 4608-fold dilution of humanized anti-HAdV-B7 monoclonal neutralizing antibody, the concentration of 0.03. mu.g/mL can inhibit CPE production by 80% of cells. The humanized modification of the murine antibody enables the original murine components to be mostly replaced by the human components, thereby avoiding the occurrence of HAMA reaction, and therefore, the humanized anti-HAdV-B7 monoclonal neutralizing antibody is safer to use.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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Claims (11)
1. A humanized anti-HAdV-B7 monoclonal neutralizing antibody is characterized in that the gene sequence of the coded antibody comprises a heavy chain variable region sequence and a light chain variable region sequence, wherein the gene sequence of the heavy chain variable region is shown as SEQ ID NO.1, and the gene sequence of the light chain variable region is shown as SEQ ID NO. 2.
2. A recombinant vector capable of expressing the heavy chain variable region and the light chain variable region of the humanized anti-HAdV-B7 monoclonal neutralizing antibody of claim 1.
3. A method for preparing the recombinant vector according to claim 2, comprising the steps of:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibodies by using a hybridoma technology, and carrying out expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification; connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
Respectively extracting mouse-derived antibody heavy chain variable region gene fragment expression plasmids and mouse-derived antibody light chain variable region gene fragment expression plasmids, co-transfecting cells with the mouse-derived antibody heavy chain variable region gene fragment expression plasmids and the mouse-derived antibody light chain variable region gene fragment expression plasmids, collecting cell culture supernatant, and detecting the neutralizing activity of the chimeric antibody against HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, collecting cell culture supernatant, separating and purifying the chimeric antibody, and determining the concentration of the chimeric antibody after concentration;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a murine antibody light chain variable region, replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a human antibody heavy chain variable region, respectively, and constructing a humanized antibody heavy chain variable region; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector, connecting the humanized antibody heavy chain variable region gene to the expression vector to cotransfect with the humanized antibody light chain variable region gene expression vector, and identifying.
4. A recombinant cell expressing the humanized anti-HAdV-B7 monoclonal neutralizing antibody of claim 1.
5. A recombinant cell comprising the recombinant vector of claim 2 or 3.
6. A method for producing the recombinant cell of claim 5, comprising the steps of:
(1) recovery and culture of hybridoma cells
Preparing hybridoma cells secreting mouse anti-HAdV-B7 monoclonal neutralizing antibodies by using a hybridoma technology, and carrying out expanded culture on the hybridoma cells;
(2) amplification of heavy chain variable region Gene and light chain variable region Gene
(2.1) RNA extraction: extracting total RNA of the hybridoma cells;
(2.2) reverse transcription: carrying out reverse transcription on the extracted total RNA to synthesize cDNA;
(2.3) PCR amplification: respectively carrying out PCR amplification on a mouse-derived antibody heavy chain variable region gene fragment and a mouse-derived antibody light chain variable region gene fragment by taking the synthesized cDNA as a template, and respectively recovering the mouse-derived antibody heavy chain variable region gene fragment and the mouse-derived antibody light chain variable region gene fragment;
(3) construction of mouse-derived antibody heavy chain variable region gene segment and mouse-derived antibody light chain variable region gene segment expression vector
Connecting the recovered heavy chain variable region gene segment of the murine antibody to an expression vector, and performing transformation and identification;
connecting the recovered murine antibody light chain variable region gene fragment to an expression vector, and carrying out transformation identification;
(4) expression of chimeric antibodies and detection of neutralizing Activity thereof
Respectively extracting mouse-derived antibody heavy chain variable region gene fragment expression plasmids and mouse-derived antibody light chain variable region gene fragment expression plasmids, co-transfecting cells with the mouse-derived antibody heavy chain variable region gene fragment expression plasmids and the mouse-derived antibody light chain variable region gene fragment expression plasmids, collecting cell culture supernatant, and detecting the neutralizing activity of the chimeric antibody against HAdV-B7;
(5) expression and purification of chimeric antibodies
Respectively extracting a mouse-derived antibody heavy chain variable region gene fragment expression plasmid and a mouse-derived antibody light chain variable region gene fragment expression plasmid, co-suspending transfected cells by the mouse-derived antibody heavy chain variable region gene fragment expression plasmid and the mouse-derived antibody light chain variable region gene fragment expression plasmid, collecting cell culture supernatant, separating and purifying the chimeric antibody, and determining the concentration of the chimeric antibody after concentration;
(6) detection of neutralizing Activity of chimeric antibodies
(7) Humanization engineering
Determining heavy chain CDR1, heavy chain CDR2, heavy chain CDR3, heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region, determining light chain CDR1, light chain CDR2, light chain CDR3, light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of a murine antibody light chain variable region, replacing heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a murine antibody heavy chain variable region with heavy chain FR1, heavy chain FR2, heavy chain FR3 and heavy chain FR4 of a human antibody heavy chain variable region, respectively, and constructing a humanized antibody heavy chain variable region; replacing light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the murine antibody with light chain FR1, light chain FR2, light chain FR3 and light chain FR4 of the light chain variable region of the humanized antibody respectively to construct a humanized antibody light chain variable region; synthesizing a humanized antibody heavy chain variable region gene and a humanized antibody light chain variable region gene according to CHO cell codons; connecting the humanized antibody heavy chain variable region gene to an expression vector to construct a humanized antibody heavy chain variable region gene expression vector, and connecting the humanized antibody light chain variable region gene to the expression vector to construct a humanized antibody light chain variable region gene expression vector;
(8) expression of humanized antibody and detection of neutralizing Activity thereof
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-transfecting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the chimeric antibody, and detecting the neutralizing activity of the chimeric antibody against HAdV-B7;
(9) expression and purification of humanized antibodies
Respectively extracting a humanized antibody heavy chain variable region gene expression vector and a humanized antibody light chain variable region gene expression vector, co-suspending and transfecting cells by respectively extracting the humanized antibody heavy chain variable region gene expression vector and the humanized antibody light chain variable region gene expression vector to obtain recombinant cells, collecting recombinant cell culture supernatant, separating and purifying the humanized antibody, and measuring the concentration after concentration;
(10) the neutralizing activity of the humanized antibody against HAdV-B7 was examined.
7. A pharmaceutical composition comprising the humanized anti-HAdV-B7 monoclonal neutralizing antibody of claim 1.
8. The pharmaceutical composition of claim 7, further comprising at least one of a pharmaceutically acceptable carrier, diluent, or excipient.
9. Use of the humanized anti-HAdV-B7 monoclonal neutralizing antibody of claim 1 for the preparation of a diagnostic kit for the detection of HAdV-B7.
10. A severe pneumonia virus diagnostic kit comprising the humanized anti-HAdV-B7 monoclonal neutralizing antibody according to claim 1, wherein the severe pneumonia virus is HAdV-B7.
11. A method of producing a humanized anti-HAdV-B7 monoclonal neutralizing antibody according to claim 1, comprising the steps of:
culturing a recombinant cell, and isolating and purifying the humanized anti-HAdV-B7 monoclonal neutralizing antibody from the culture product, wherein the recombinant cell comprises a recombinant vector comprising a nucleic acid sequence encoding the humanized anti-HAdV-B7 monoclonal neutralizing antibody of claim 1.
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