CN104650200A - Plant protein with tumor antigenicity - Google Patents

Plant protein with tumor antigenicity Download PDF

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Publication number
CN104650200A
CN104650200A CN201510038320.0A CN201510038320A CN104650200A CN 104650200 A CN104650200 A CN 104650200A CN 201510038320 A CN201510038320 A CN 201510038320A CN 104650200 A CN104650200 A CN 104650200A
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protein
vegetable
centrifugal
tumor
precipitation
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CN104650200B (en
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郑振海
郑新文
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Zheng Xinwen
Zheng Zhenhai
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K14/00Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/415Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides

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  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Gastroenterology & Hepatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Medicinal Chemistry (AREA)
  • Molecular Biology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
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  • Peptides Or Proteins (AREA)

Abstract

The invention provides a plant protein extracted from low-grade plant lichens. According to the verification, the protein is high in tumor antigenicity. The invention also discloses a method for preparing the plant protein. The plant protein can be effectively combined with cell extracts of at least seven tumor cells (human breast cancer cells, gastric carcinoma cells, pulmonary squamous carcinoma cells, human colon cancer cells, uterine cervix carcinoma cells, hepatoma carcinoma cells and human renal carcinoma cells).

Description

A kind of tumor antigenicity vegetable-protein
Technical field
The invention belongs to biological technical field, especially relate to a kind of tumor antigenicity vegetable-protein.
Background technology
Because cancer can not carry out early detection at present, and the determination of tumour antigen is significant to immunotherapy of tumors, and have been reported and find that the isoformgene of different genera shows as certain homology, biological sibship is far away, and its immunity is stronger.Accordingly, people just expect the tumor antigenicity material that can find a class xenogenesis homology, and utilize tumour antibody in its human body, realize the object of early diagnosis of cancer.
Summary of the invention
This research is extracted a kind of vegetable-protein from lower plant lichens, confirms that this kind of albumen has tumor antigenicity by immunoblotting (Westen Blotting), can as the marker of infantile tumour diagnosis.
The object of this invention is to provide a kind of tumor antigenicity vegetable-protein, be vegetable-protein by this protein designations, this vegetable-protein has tumor associated antigen.
A kind of tumor antigenicity vegetable-protein, the amino acid forming this albumen has the sequence of SEQ ID NO:1, and this albumen can be used for the detection of tumour, also can be used for the medicine preparing Tumor suppression growth.
Prepare the method for this tumor antigenicity vegetable-protein:
(6) take 40g Lichen tissue, smash to pieces, then carry out fragmentation with liquid nitrogen grinding and ultrasonic fragmentation respectively, centrifugal after broken, dissolve supernatant liquor with phosphate buffered saline buffer;
(7) with distilled water or phosphate buffered saline buffer freeze-thaw method broken further to the Lichen tissue cell obtained, centrifuging and taking supernatant after cytoclasis;
(8) ammonium sulfate precipitation is slightly carried albumen, add ammonium sulfate to 20% saturation ratio, centrifuging and taking supernatant after vulcanization acid ammonium salt to 40% saturation ratio, centrifugal, the 1mmol/L phosphoric acid buffer (ph6.8) of precipitation equivalent dissolves, and can obtain the sulfuric acid of 20%-40%, centrifugal rear on reset and add ammonium sulfate to 60% saturation ratio, centrifugal, the 1mmol/L phosphoric acid buffer (ph6.8) of precipitation equivalent dissolves, the ammonium sulfate precipitation crude protein of ammonium precipitation crude protein and 40%-60%;
(9) above-mentioned two kinds of crude protein are after Preliminary detection, by the extracting solution containing target protein after membrane filtration, carry out desalination by sephadex25 desalting column;
(10) after desalination, upper adsorptivity HA post, with the ever-increasing phosphate buffered saline buffer of ionic strength (ph6.8 is containing different concns Nacl) wash-out, Fraction collection, detects target protein in each concentration elutriant collected with SDS-PAGE protein electrophoresis;
(6) detect the concentration of the pure albumen of gained with Xylene Brilliant Cyanine G test kit ,-70 DEG C save backup.
Further, above-mentioned steps all lucifuge and not higher than the condition of 4 DEG C under carry out.
Further, centrifugal in step (2) is 4 DEG C, 5000r/min, 15min.
The pure vegetable protein extracted obtains the protein sequence of SEQ ID NO:1 through the order-checking of N end.
The application of this vegetable-protein in cancer early detection.
The application of this vegetable-protein in cancer therapy drug.
Verified, this vegetable-protein all can effectively be combined with the cytoclasis thing of human breast cancer cell, stomach cancer cell, Lung Squamous Carcinoma Cells, human colon cancer cell, cervical cancer cell, human liver cancer cell, human renal carcinoma cell, confirms that this vegetable-protein has the characteristic of kinds of tumors antigen.
Accompanying drawing explanation
Fig. 1 is the SDS-PAGE electrophorogram of this vegetable-protein.
Fig. 2 is that the western-blot that this vegetable-protein is combined with seven kinds of tumor markerses schemes.
Embodiment
The preparation of embodiment 1. vegetable protein
Take 40g Lichen tissue, mortar is smashed to pieces, then carries out fragmentation with liquid nitrogen grinding and ultrasonic fragmentation respectively, centrifugal after broken, dissolves supernatant liquor with phosphate buffered saline buffer; Carry out fragmentation to the cell of the tissue juice obtained further with phosphate buffered saline buffer freeze-thaw method, at 4 DEG C, 5000rpm, through centrifugal 15min, gets supernatant liquor; Add ammonium sulfate to 20% saturation ratio, 4 DEG C are spent the night, the centrifugal 10min of 5000rpm, in supernatant liquor, add ammonium sulfate to 40% saturation ratio, 4 DEG C are spent the night, the centrifugal 10min of 5000rpm, collecting precipitation, dissolve with 1mmol/L phosphoric acid buffer (ph6.8), dissolution precipitation, obtains 20%-40% ammonium sulfate precipitation crude protein.Continue to add ammonium sulfate to 60% saturation ratio in above-mentioned supernatant liquor, 4 DEG C are spent the night, the centrifugal 10min of 5000rpm, collecting precipitation, the 1mmol/L phosphoric acid buffer (ph6.8) of precipitation equivalent dissolves, obtain 40%-60% ammonium sulfate precipitation crude protein, the present embodiment carries out further separation and purification to 40%-60% ammonium sulfate precipitation crude protein.
By above-mentioned crude protein after filtering, desalination is carried out by the desalination of sephadex25 post.Go up adsorptivity HA post again, with the ever-increasing phosphate buffered saline buffer wash-out of ionic strength, (concentration of elutriant uses the NaCl solution wash-out of 0.05mol/L, 0.10mol/L, 0.20mol/L, 0.30mol/L, 0.40mol/L, 0.8mol/L, 1.Omol/L successively, the PH of elutriant is 6.8), Fraction collection, collect the albumen of each eluate concentration, detect the albumen of each wash-out concentration with SDS-PAGE protein electrophoresis.The elutriant containing the NaCl of 0.8mol/L after testing contains the single band of target protein, and as shown in Figure 1, the size of this vegetable-protein is 47KD, consistent with the molecular size range analyzed through bioinformatics software.
The preparation of embodiment 2. rabbit anti-plant protein antibody
The vegetable-protein prepared is prepared into injection liquid, select the Female New Zealand big white mouse of 1.5-2kg, every immunity in 3 weeks once, immunity 4 times altogether, first time immunity 0.4g antigen adds complete Freund's adjuvant and carries out immunity through dorsal sc multiple spot (being no less than 8 points) injections of antigens, three intramuscular injection 0.2g antigens next add incomplete Freund's adjuvant and carry out immunity, immunity is after 7 days the last time, blood separation of serum is got in ear vein, with tiring of indirect elisa method agreement serum antibody, tiring is 2 × 10 1.
The Western-blot of the anti-vegetable-protein of embodiment 3. rabbit and tumour antigen detects
Get seven kinds of cancer cells and be respectively MCF-7 Human Breast Cancer Cells, BGC-823 Cells, lung squamous cancer NCI-H520 cell, human colon carcinoma SW480 cell, cervical cancer Hela cell, human hepatoma HepG2 cell, people kidney HEK293 cell, seven kinds of cancer cells are carried out cracking, take cell lysate as antigen, in embodiment 2, the rabbit anti-plant protein antibody of preparation is antibody, then be combined with immune complex with mouse-anti rabbit monoclonal antibodies, combine with the sheep anti mouse polyclonal antibody of HRP mark again, then detect with ECL luminescent solution, detected result as shown in Figure 2, protein electrophoresis result shows, the seven kinds of cancer cell lysate in position of 90kD and the antibody of this vegetable-protein all have in conjunction with band, prove that rabbit resists the antibody capable of this vegetable-protein to be effectively combined with the antigen of seven kinds of cancer cells, this vegetable-protein has the characteristic of kinds of tumors antigen.
Embodiment 4. vegetable protein early diagnosis of tumor is applied
With 131i marks the rabbit anti-plant protein antibody in embodiment 2, detects its distribution in tumor-bearing mice body, 131i mark rabbit anti-plant protein antibody by its through tail vein injection to lotus S-180 transplanted tumor mouse, after injection, 12h, 24h, 36h, 48h, 72h and 96h put to death animal respectively, carry out radio-immuno-image, get a certain amount of eyeball blood, the heart, liver, spleen and tumor tissues, weigh and use γ-counter to measure its radiocounting.
Result: 131rabbit anti-plant protein antibody 36-96h tumor locus in injection Mice Body of I mark has radioactivity dense poly-, the position size of high radioactivity Nong Ju district and tumor-bearing mice institute lotus knurl is basically identical, video picture is the most clear with 48-72h after injecting antibody, the uptake ratio of each phase tumor tissues is significantly higher than other parenchymatous organs tissue, at 12h, 24h, 36h, 48h, the uptake ratio of 72h and 96h tumor tissues is respectively 1.63, 2.42, 2.92, 3.10, 2.88, 2.64, the maximum value of other substantive tissue is 0.86, the ratio prolongation in time of different tumor tissues and other tissue radiation activity is constantly increased, 48h reaches the highest, 72-96h reduces again gradually, rabbit anti-plant protein antibody energy specific binding tumour cell is described.
Above specific embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (5)

1. a tumor antigenicity vegetable-protein, is characterized in that: the amino acid forming this albumen has the sequence of SEQ ID N0:1.
2. prepare the method for tumor antigenicity vegetable-protein described in claim 1:
(1) take 40g Lichen tissue, smash to pieces, then carry out fragmentation with liquid nitrogen grinding and ultrasonic fragmentation respectively, centrifugal after broken, dissolve supernatant liquor with phosphate buffered saline buffer;
(2) with distilled water or phosphate buffered saline buffer freeze-thaw method broken further to the Lichen tissue cell obtained, centrifuging and taking supernatant after cytoclasis;
(3) ammonium sulfate precipitation is slightly carried albumen, add ammonium sulfate to 20% saturation ratio, centrifuging and taking supernatant after vulcanization acid ammonium salt to 40% saturation ratio, centrifugal, the 1mmol/L phosphoric acid buffer (ph6.8) of precipitation equivalent dissolves, and can obtain the sulfuric acid of 20%-40%, centrifugal rear on reset and add ammonium sulfate to 60% saturation ratio, centrifugal, the 1mmol/L phosphoric acid buffer (ph6.8) of precipitation equivalent dissolves, the ammonium sulfate precipitation crude protein of ammonium precipitation crude protein and 40%-60%;
(4) above-mentioned two kinds of crude protein are after Preliminary detection, by the extracting solution containing target protein after membrane filtration, carry out desalination by sephadex25 desalting column;
(5) after desalination, upper adsorptivity HA post, with the ever-increasing phosphate buffered saline buffer of ionic strength (ph6.8 is containing different concns Nacl) wash-out, Fraction collection, detects target protein in each concentration elutriant collected with SDS-PAGE protein electrophoresis;
(6) detect the concentration of the pure albumen of gained with Xylene Brilliant Cyanine G test kit ,-70 DEG C save backup.
3. the method preparing tumor antigenicity vegetable-protein according to claim 2, is characterized in that: above-mentioned steps all lucifuge and not higher than the condition of 4 DEG C under carry out.
4. the method preparing tumor antigenicity vegetable-protein according to claim 2, is characterized in that: centrifugal in step (2) is 4 DEG C, 5000r/min, 15min.
5. vegetable-protein described in claim 1 is preparing the application in cancer therapy drug.
CN201510038320.0A 2015-01-23 2015-01-23 A kind of tumor antigenicity vegetable protein Expired - Fee Related CN104650200B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105907729A (en) * 2015-05-05 2016-08-31 广东东阳光药业有限公司 Method for preparing human papilloma virus (HPV) L1 protein virus-like particles (VLP)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101348812A (en) * 2007-07-19 2009-01-21 中国医学科学院放射医学研究所 Lichenin, and preparation and use thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101348812A (en) * 2007-07-19 2009-01-21 中国医学科学院放射医学研究所 Lichenin, and preparation and use thereof

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ARNAB DAS,ET AL: "Murine carcinoma expressing carinoembryonic antigen-like protein is restricted by antibody against neem leaf glycoprotein", 《IMMUNOLOGY LETTERS》 *
KOUSTAV SARKAR,ET AL: "Neem leaf glycoprotein helps to generate carcinoembryonic antigen specific anti-tumor immune responses utilizing macrophage-mediated antigen presentation", 《VACCINE》 *
丁献义,等: "131I标记的一种抗植物蛋白抗体及其片段在荷瘤小鼠体内的分布", 《河北医科大学学报》 *
邓学峰,等: "一种植物蛋白的肿瘤抗原活性的研究", 《免疫学杂志》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105907729A (en) * 2015-05-05 2016-08-31 广东东阳光药业有限公司 Method for preparing human papilloma virus (HPV) L1 protein virus-like particles (VLP)
CN105907729B (en) * 2015-05-05 2019-08-16 广东东阳光药业有限公司 A method of preparing human mammilla tumor virus L 1 protide virus-like particle

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