KR20050114100A - A kit for diagnosis of colon cancer - Google Patents

Abstract

The present invention relates to a colorectal cancer diagnostic kit comprising a colorectal cancer diagnostic substrate and an electric substrate capable of detecting a colorectal cancer specific antigen in a blood sample of a subject. The colorectal cancer diagnostic kit of the present invention includes a colorectal cancer diagnostic substrate to which an antibody capable of specifically binding to colorectal cancer specific antigen is attached, and a detection means for detecting colorectal cancer specific antigen bound to an antibody on an electrical substrate. do. The colorectal cancer diagnostic kit of the present invention can be widely used for the early diagnosis of colorectal cancer because it is possible to confirm the onset of colorectal cancer even by blood samples of the subject.

Description

A kit for diagnosis of colon cancer

The present invention relates to a kit for diagnosing colorectal cancer. More specifically, the present invention relates to a colorectal cancer diagnostic kit comprising a colorectal cancer diagnostic substrate and an electrical substrate capable of detecting a colorectal cancer specific antigen in a blood sample of a subject.

Among the major diseases of modern people, researches on the treatment and diagnosis of cancer are relatively active, mainly in lung cancer, liver cancer, gastric cancer, and the like. However, studies on esophageal cancer and colorectal cancer with low incidence are relatively low. Colon cancer, on the other hand, does not feel much at first, so regular diagnosis is very important. Especially, if you have signs of indigestion or defecation habits, bloody stool, pain, and anemia in your 40s or older, be sure to check for colon cancer. It is desirable to receive. Electrical colon cancer examination is performed by digital rectal examination, sigmoidoscopy, colonoscopy or barium enema. Rectal examination is a method in which the examiner wears gloves, lubricates, and inserts a hand into the rectum to facilitate normal colon surgery.A colonoscopy is a long, flexible tube with a mirror that is placed in the colon and colon through the rectum. Insertion is directly observed, and colonoscopy is a method of directly examining the inside of the colon using an endoscope, and colonography is a method of detecting abnormalities of blood vessels distributed in the colon after adding contrast medium. Such a test method is a method of simply determining the abnormality of the large intestine, and by these methods, when a disease lesion is found, a more true biopsy is performed. When a disease lesion is found and diagnosed by performing a biopsy, a relatively accurate test result may be obtained. However, the diagnosis method is very uncomfortable because the patient is reluctant to perform this method, such as pain. Therefore, there has been a demand for the development of a test method for easily and quickly diagnosing colorectal cancer.

On the other hand, a method using a gene has been developed to diagnose a genetic mutation such as cancer. Although significant results have been reported for lung cancer, liver cancer, and gastric cancer, which have high incidence, relatively low incidence is reported. In the case of colorectal cancer, the research results are not much. In the diagnostic method using the gene, DNA is extracted from a tissue suspected of cancer by polymerase chain reaction (PCR), or RNA is extracted from the tissue and analyzed by gene expression analysis using a cDNA microarray. The former is effective only in certain cancers, such as chronic myelogenous leukemia (CML) or acute lymphocytic leukemia (ALL), mainly caused by chromosome translocation. There is a disadvantage that a conventional cancer diagnosis method such as examination or CT imaging should be preceded.

In order to overcome the drawbacks of the above-described cancer diagnostic method, a method for detecting and diagnosing a cancer-specific antigen has been developed. A representative example of the cancer-specific antigen may be a carcinoembryogenic antigen (CEA). CEA is known to increase in levels in patients with rectal-colon cancer, stomach cancer, breast chamber, lung cancer, ovarian cancer, prostate cancer, liver cancer and pancreatic cancer. A number of cancer diagnostic kits have also been developed through the method of detecting CEA. Korean Patent No. 151823 discloses monoclonal antibodies that can specifically bind to CEA, and Korean Patent No. 395206 discloses monoclonal antibodies against CEA. Ultrafast liver cancer, colorectal cancer, and prostate cancer diagnostic strips are disclosed. However, as described above, since CEA is expressed not only in colorectal cancer but also in other cancer tissues, it cannot be called a colorectal cancer-specific antigen, and thus, no colorectal cancer-specific antigen specifically expressed only in colorectal cancer patients has been reported. .

Therefore, there is a constant need to develop a method for screening for colorectal cancer specific antigens and using the antibodies against the cancer to rapidly and accurately diagnose colorectal cancer.

Therefore, the present inventors have made efforts to develop a method for selecting colon cancer-specific antigens and rapidly and accurately diagnosing colorectal cancer using antibodies against them, which are specifically expressed in colon cancer tissues and secreted into the blood. When the protein was selected, and when the electrical protein was detected in the blood sample of the subject, it was confirmed that colorectal cancer can be diagnosed quickly and accurately, thereby completing the present invention.

After all, the main object of the present invention is to provide a substrate for diagnosing colorectal cancer capable of detecting a colorectal cancer specific antigen in a blood sample.

Another object of the present invention is to provide a kit for diagnosing colorectal cancer comprising an electric substrate.

The substrate for diagnosing colorectal cancer of the present invention is an anti-α6 defensin antibody, an anti-amphiregulin antibody, an anti-galanin antibody, and an anti-MIP3. at least one antibody selected from the group consisting of an anti-macrophage inflammatory protein 3-α antibody, and a solid phase support having an electrical antibody attached thereto, wherein the electrical solid phase support is not particularly limited thereto. It is preferably an NC (nitrocellulose) film, a PVDF (polyvinylidene fluoride) film, a microplate, a glass substrate, a polystyrene plate, a silicon substrate or a metal plate, and more preferably an NC film, a microplate or a glass substrate. In addition, the antibody is not particularly limited, but it is preferable to use a polyclonal antibody or a monoclonal antibody, more preferably to use a monoclonal antibody, the antibody is a hydrogen bond, a aldehyde bond, poly-L- It is preferable to adhere to the solid-state support by a method such as lysine and a linkage by a linker.

Meanwhile, the kit for diagnosing colorectal cancer of the present invention is a detection means capable of detecting a colorectal cancer specific antigen bound to an antibody on a colorectal cancer diagnostic substrate and an electrical substrate to which an antibody capable of specifically binding to colorectal cancer specific antigen is attached. In this case, the detection means is not particularly limited thereto, but may specifically bind to a primary antibody-gold conjugate capable of specifically binding to an antigen bound to an antibody on a substrate or an antigen bound to an antibody on an electrical substrate. It is preferable to use a secondary antibody-signal complex or the like that specifically binds to a primary antibody and an electrical primary antibody. In particular, when the secondary antibody-signal complex is used as the detection means, the signal complex is not particularly limited thereto, but the fluorescent substance (for example, Cy-3, Cy-5, FITC, GFP (green fluorescent protein), RFP (red) fluorescent protein, Texas Red, etc.), luminescent materials, radioisotopes, enzymes (e.g. horse raddish peroxidase), alkaline phosphatase, beta galactosidase (β-galactosidase) , Luciferase, etc.) is preferably used, and when an enzyme is used as a signal complex, colorectal reagents that cause color reaction by an electric enzyme may be additionally included in the diagnostic kit for colorectal cancer.

According to one embodiment of the present invention, the colorectal cancer diagnostic kit of the present invention is a substrate for diagnosing colorectal cancer, an NC (nitrocellulose) membrane or PVDF (polyvinylidene fluoride) having an antibody capable of specifically binding to an electric colorectal cancer specific antigen. ) Using a membrane and a primary antibody-gold conjugate capable of specifically binding to an antigen bound to an antibody on an electrical substrate as a detection means for detecting colorectal cancer specific antigen bound to an antibody on an electrical colorectal cancer diagnostic substrate. Immunochromatography strip (see FIG. 1).

1 is a conceptual diagram of an immunochromatography strip for diagnosing colorectal cancer of the present invention. The electro immunochromatography strip is a sample pad (1), an immune response member, in which anti-α6 defensin, anti-ampyregulin, anti-galanine, and anti-MIP3-α polyclonal antibody to which gold particles are bound, respectively, are temporarily suspended. Fixed glass fiber (GF) filter (2), as a result indicator, for polyclonal antibody bands (determination lines, 3) specific for α6 galanine, ampyregulin, galanine and MIP3-α, respectively The NC membrane 5 and the absorbent pad 6 to which the secondary antibody band (control line 4) is fixed are mounted on the adhesive plastic backing 7.

According to another embodiment of the present invention, the colorectal cancer diagnostic kit of the present invention uses a microplate attached with an antibody capable of specifically binding to a colorectal cancer specific antigen as a substrate for diagnosing colorectal cancer, and the colorectal cancer As a detection means for detecting a colorectal cancer specific antigen bound to an antibody of a diagnostic substrate, a primary antibody capable of specifically binding to a colorectal cancer specific antigen and a secondary antibody-signal complex which specifically binds to an electrical primary antibody Is an enzyme-linked immunosorbant assay (ELISA) kit, wherein the electric microplate is attached with an anti-α6 defensin, anti-ampyregulin, anti-galanine or anti-MIP3-α antibody. In the electrical detection means, the specific anti-alpha 6 defensin, anti-ampyregulin, anti-galanine or anti-MIP3-α polyclonal antibody, which can bind specifically to the electric protein, respectively Includes a secondary antibody coupled to the enzyme, which can bind to, and may further include a reagent for generating a color reaction by the enzyme.

According to another embodiment of the present invention, the colorectal cancer diagnostic kit of the present invention uses a protein chip to which an antibody specifically binding to an electric colorectal cancer specific antigen is attached as a substrate for diagnosing colorectal cancer. As a detection means for detecting a colorectal cancer specific antigen bound to an antibody of a diagnostic substrate, a primary antibody capable of specific binding to an electric colorectal cancer specific antigen and a secondary antibody-signal complex that specifically binds to an electric primary antibody In this case, the protein chip used as the substrate is a glass substrate to which an anti-α6 defensin, anti-ampyregulin, anti-galanine or anti-MIP3-α polyclonal antibody is attached. , Consisting of a metal plate or a silicon substrate, the fluorescence immunoassay kit including the electric protein chip is α6 defensin, ampyregulin, galanin or M bound to the electric protein chip and the antibody, respectively. Detection means capable of detecting the IP3-α protein. The electric detection means is specific for an electric anti-α6 defensin, an anti-ampyregulin, an anti-galanine or an anti-MIP3-α antibody, and an electric antibody, which can each specifically bind to an electric colorectal cancer specific antibody. It consists of a secondary antibody combined with a fluorescent material capable of binding to. The electroluminescent material is not particularly limited thereto, but is preferably Cy-3, Cy-5, FITC, GFP (green fluorescent protein), red fluorescent protein (RFP), or Texas Red.

The colorectal cancer diagnostic kit of the present invention can be widely used for the early diagnosis of colorectal cancer because only the blood sample of the subject can confirm the onset of colorectal cancer.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. .

Example 1 Screening for Colorectal Cancer Specific Genes

6 normal brain tissues (BN), 19 astrocytoma tissues (BA I) of the brain, 8 normal colon tissues (CN), 38 microsatellite stability (CSS) colon cancer tissues (CMSS), MSI (microsatellite instability) 13 colorectal cancer tissues (CMSI), 10 normal lung tissues (LN), 1 st stage lung cancer tissue (LI), 7 normal pancreatic tissues (PN), 8 pancreatic cancer tissues (PT) and 8 intestines Twenty-four samples of ovary cancer serous (OS) were obtained, RNA was extracted from the sample obtained using Trizol (Life Technologies, USA), and a column (RNesay spin column, Qiagen, USA) was obtained. Purification by using only the RNAs in which 18S and 28S rRNAs were expressed similarly were selected.

CDNA was synthesized by applying 5 μg of RNA to the cDNA synthesis kit (cDNA synthesis kit, Superscript Choice System; Life Technologies, USA) using oligo (dT) ₂₄ as a primer, and then using the synthesized cDNA as a template. CRNA was synthesized using a T7 polymerase in vitro transcription system (T7 Megascript kit, Ambion, USA). At this time, the cRNA was labeled using biotin-11-CTP and biotin-16-UTP (Enzo, USA). Subsequently, 15 μg of the electrically labeled cRNA was treated with a fragmentation solution (40 mM Tris-acetate, pH 8.1, 100 mM potassium acetate, 30 mM magnesium acetate) and reacted at 94 ° C. for 30 minutes to randomize to a size of 30 to 50 bases. Sectioned. Then, hybridization cocktail (100 mmol / L MES, 1 mol / L NaCl, 20 mmol) containing 0.1 mg / ml of herring sperm DNA (Promega, USA) and 500 g / ml of acetylated BSA (Life Technologies, USA) 300 μl / L EDTA, 0.01% (v / v) Tween 20) was heated to a temperature of 94 ° C. for 5 minutes, cooled, and centrifuged at 16,000 g at room temperature to obtain a supernatant. The hybridization solution obtained above was mixed with 10 µg of the electrically fragmented cDNA, applied to a microarray (HuGeneFL Array, Affymetrix, USA) capable of identifying 7129 genes, and hybridization was performed at 45 ° C. for 16 hours. .

After the reaction was completed, the electric microarray was washed, stained with streptavidin solution (streptavidin-phycoerythrin, Molecular Probes, USA) and then washed with 6x SSPE buffer (sodium chloride, sodium phosphate, EDTA). The electro-washed microarray was then treated with biotinylated anti-streptavidin IgG, stained again with electrostreptavidin solution, and washed again with 6X SSPE. The electrical microarrays were then scanned with a scanner (GeneArray Scanner, Affymetrix, USA), and then the results were measured using an image analyzer (GeneChip software, Affymetrix, USA) and analyzed via quantile-normalization. (See Table 1).

Result of measuring specific gene expression rate in various tissues gene AC MO R BN BA I CN CMSS CMSI LN L I PN PT OS U51096 1013 111 9.16 -19 16 111 1086 805 21 31 57 31 2 X05232 855 158 5.41 33 27 99 777 1076 -4 32 43 158 -4 U22376 1758 199 8.85 42 -9 -19 1956 1195 127 149 56 -31 199 U51095 2498 438 5.70 33 93 193 2474 2564 58 51 438 179 54 X14253 1103 236 4.68 58 65 85 1349 405 22 57 236 80 48 L21998 6963 1345 5.18 859 1037 245 6139 9306 893 1141 1345 1057 1292 U30246 1578 288 5.48 93 29 288 1374 2160 70 151 108 80 100 U33317 1381 405 3.41 171 149 405 1494 1058 59 134 76 31 127 U79725 2424 730 3.32 65 26 730 2622 1862 345 102 10 49 74 L02785 1293 337 3.84 68 67 337 1710 108 13 32 87 213 31 M10050 7363 2652 2.78 -91 -135 2652 9101 2416 -148 -81 -12 -68 -145 L41349 628 188 3.33 108 79 61 701 421 79 47 188 98 65 X83228 4316 626 6.89 -35 -27 626 4641 3389 -45 41 56 147 -35 M30496 1777 572 3.11 356 341 290 1954 1273 382 435 189 478 572 Z29067 796 278 2.86 178 278 165 914 459 192 187 129 203 186 L41939 851 292 2.91 180 189 40 917 664 272 185 201 64 292 U07969 5795 626 9.25 180 181 626 5962 5317 127 234 -10 383 115 U26726 1773 463 3.83 91 43 463 1882 1464 97 237 309 347 321 X12901 1374 205 6.72 -21 13 188 1578 791 -44 183 205 141 -26 M73489 1406 686 2.05 204 169 362 1553 987 106 172 686 168 138 M76180 2273 647 3.52 6 14 647 2615 1300 116 326 580 189 48 L25931 2044 702 2.91 166 571 386 2177 1665 618 702 341 483 664 U55206 2009 613 3.28 117 162 159 2311 1149 141 292 38 124 613 M77140 578 188 3.08 22 29 188 637 412 -24 29 41 48 9 M30703 1054 537 1.96 -26 64 102 1214 595 487 537 22 239 -16 M29540 22036 5652 3.90 -12 5 331 23943 16608 83 5652 85 4015 -45 M63967 432 198 2.18 42 58 145 459 355 60 168 171 198 176 U64197 1063 470 2.26 109 60 470 1115 913 123 401 178 378 276 X98311 927 361 2.57 185 173 72 988 754 81 223 249 361 157 M15796 2201 1175 1.87 85 261 556 2028 2694 369 641 123 398 1175

(Continued on next page)

D13645 1039 512 2.03 104 114 97 1080 921 277 332 230 345 512 M85085 282 153 1.84 67 66 22 265 328 -19 112 -26 81 153 L25876 1340 712 1.88 273 160 145 1250 1596 107 404 288 665 712 J04102 2466 1036 2.38 88 153 369 2605 2072 1036 851 -142 306 76 L00058 2309 998 2.31 42 282 374 2465 1866 735 566 422 463 998 M14758 615 344 1.79 242 251 76 768 179 344 58 94 77 95 D63486 8118 4381 1.85 3349 4381 4114 7767 9115 3169 4242 2799 2499 3738 U41813 570 325 1.75 48 26 325 548 631 -18 14 63 16 -3 M36067 338 195 1.73 102 3 -19 338 339 22 35 -3 -3 195 D87682 588 340 1.73 167 107 102 627 476 82 175 -29 84 340 X59543 1558 918 1.70 141 444 239 1440 1894 504 538 151 605 918 Z48541 1227 453 2.71 453 295 46 1530 366 313 144 210 75 98 U27333 4958 2009 2.47 -178 -192 2009 4630 5891 309 1258 -6 1139 104 X53586 2342 1376 1.70 188 355 1376 2349 2322 792 555 729 1136 571 U19523 559 314 1.78 -22 -18 196 512 692 314 304 65 214 160 U09564 2552 1438 1.77 724 519 735 2661 2242 638 1209 842 1438 1406 M29536 7070 4360 1.62 1945 2264 3891 7747 5144 2602 3279 2738 3016 4360 X68314 14315 9168 1.56 454 343 9168 15115 12039 162 3248 437 3224 254 D87716 479 303 1.58 149 197 63 410 674 146 207 58 303 288 L23808 2965 1471 2.02 27 -23 536 2716 3674 30 1471 126 254 496 U78525 4288 2719 1.58 1148 1391 1566 4606 3383 1070 2528 1169 2719 2412 D50919 446 274 1.63 -49 163 274 424 510 237 253 17 235 274 X60486 1950 1282 1.52 476 317 648 1710 2631 618 603 390 545 1282 U24169 2148 1414 1.52 338 537 496 2265 1815 415 966 209 1084 1414

In Table 1, AC represents the average value of the specific gene expression ratio in colorectal cancer tissue, MO represents the highest value of the expression ratio of the gene among other tissues, R means the ratio of electric AC divided by MO.

In addition, in Table 1, gene U51096 is a caudal type homeo box transcription factor 2, X05232 is a matrix metalloproteinase 3, and U22376 is a v-myb avian bone marrow. Avian myeloblastosis viral oncogene homolog, U51095 is a caudal type homeo box transcription factor 1, X14253 is a teratocarcinoma-derived growth factor factor 1: TDGF1), L21998 is intestinal / tracheal mucin 2, U30246 is a sodium / potassium / chloride transporter, solute group 12 member 2 (solute) carrier family 12, member 2), U33317 is Panes cell-specific defensin (alpha 6), U79725 is trans-membrane glycoprotein A33, and L02785 is a solute transporter 26 Military carrier 3 ly 26, member 3), M10050 is fatty acid binding protein 1, L41349 is phospholipase C beta 4, and X83228 is liver-intestine cadhedrine Cadherin 17, M30496 is the ubiquitin carboxyl-terminal esterase L3 (ubiquitin thiolesterase), Z29067 is the never in mitosis gene a- NIMA-related kinase 3, L41939 is EphB2, U07969 is liver-intestine cadhedrine, cadherin 17, U26726 is hydroxysteroid (11-beta) dehydrogenase 2 ( hydroxysteroid (11-beta) dehydrogenase 2), X12901 is villin 1, M73489 is the heat stable enterotoxin receptor guanylate cyclase 2C, and M76180 is aromatic L Aromatic L-amino acid decarbo Dopa decarboxylase (xylase), L25931 is a lamin B receptor, U55206 is a conjugase and polymethylpolygamma-glutamyl hydrolase Glutamyl hydrolase, M77140 is galanin, M30703 is a schwannoma-derived growth factor amphiregulin, and M29540 is a fetal antigen-associated cell Carcinoembryonic antigen-related cell adhesion molecule 5, M63967 is aldehyde dehydrogenase 5, U64197 is macrophage inflammatory protein 3-α (MIP3-α), and X98311 is cancerous Carcinoembryonic antigen-related cell adhesion molecule 7, M15796 is proliferating cell nuclear antigen (PCNA), D13645 is KIAA0020 gene product, M85085 is 64kD The cleavage stimulation factor (subunit 2), L25876, is a cyclin-dependent kinase inhibitor 3, a CDK2-associated dual specificity phosphatase, and J04102 is a v. -ets avian erythroblastosis virus E26 oncogene homolog 2, L00058 is v-myc avian myelocytomatosis viral oncogene homolog, M14758 is ATP-binding ATP-binding cassette, sub-family B, member 1, D63486 is the KIAA0152 gene product, U41813 is homeo box A9, M36067 is ATP-dependent DNA ligase I (ATP -dependent DNA ligase I), D87682 is the KIAA0241 protein, X59543 is the ribonucleotide reductase M1, Z48541 is the receptor type protein tyrosine phosphatase O, U27333 is galactoside 3 (4) -L-fucosyltransferase, fucosyltransferase 3, and X53586 is integrin alpha 6, U19523. Is GTP cyclohydrolase 1, U09564 is SFRS (splicing factor serine / arginine specific) protein kinase 1, and M29536 is a 38 kD eukaryotic translation initiator 2 subunit 2. initiation factor 2, subunit 2), X68314 is glutathione peroxidase 2, D87716 is KIAA0007 protein, L23808 is macrophage elastase, matrix metalloproteinase 12, U78525 is the eukaryotic translation initiation factor 3, subunit 9 of 116 kD size, D50919 is the KIAA0129 gene product, X60486 is the H4 histone family, member G (H4 histone family, member G) and U24169 JTV1 gene It refers to water, respectively.

As shown in Table 1, the genes were confirmed that the expression level in the colorectal cancer tissue is significantly higher than the expression level in the normal colon tissue as well as other cancer tissues.

Example 2 Western Blot Analysis

Among the 54 colon cancer-specific expression genes, colon cancer patients, normal people, and other cancers were selected using antibodies that select six proteins that are secreted extracellularly and specifically bind to proteins expressed by these genes. Western blot analysis was performed on blood samples obtained from the patients. The electrical proteins are TDGF1, mucin 2, MIP3-α, galanin, ampyregulin and α6 defensin.

First, serum was separated from the blood of a patient who provided the normal tissue and the cancer tissue of Example 1, and then electrophoretically separated electrophoresed on 6 10% SDS-polyacrylamide gels, respectively, and then electrically The method was transferred to PVDF (poly vinylidene flouride, Millipore, USA) membrane. In order to reduce the nonspecific reaction of the protein transferred to PVDF membrane, the electric PDVF membrane was blocked for 12-14 hours with blocking buffer (3% bovine serum albumin, 0.05% Tween 20 in PBS). Anti-TDGF1 rabbit polyclonal antibody (Biocat, Germany), anti-mucin2 rabbit polyclonal antibody (Abcam, UK), anti-MIP3-α rabbit polyclonal antibody (Abcam, UK), Anti-galanine rabbit polyclonal antibody (Abcam, UK), anti-ampyregulin rabbit polyclonal antibody (Abcam, UK) and anti-α6 defensin rabbit polyclonal antibody (Alpha Diagnostic International, USA) 1: 200, respectively. The solution was diluted with an electric blocking buffer at a concentration of (v / v) and reacted by stirring at room temperature for 2 hours. Then, washed three times for 10 minutes with PBST (0.05% Tween 20 in PBS), and the anti-rabbit goat IgG (Santa Cruz Biotechnology, USA) bound with horse raddish peroxidase (HRP) was 1: 200 (v / v). The blocking buffer diluted with) was treated to the PDVF membrane which was washed electrically, and reacted by stirring at room temperature for 45 minutes. Subsequently, washed three times with PBST for 10 minutes, followed by chemiluminescence reaction using ECL ^TM kit (Amersham, UK), which was analyzed by PhosphaImager (Fuji, Japan).

As a result, α6 defensin, mucin 2, MIP3-α and ampyregulin were clearly detected in the blood of colorectal cancer patients. On the other hand, except for mucin 2, it was confirmed that it was not detected in the blood of normal people or other cancer patients. Mucin 2 was most clearly detected in colorectal cancer, but in some brain cancer, pancreatic cancer and ovarian cancer patients. Detected in blood. On the other hand, TDGF1 and galanin were not able to confirm significant results in the blood of colorectal cancer patients, but re-testing by increasing the antibody concentration, galanin was able to detect a signal in the blood of colorectal cancer patients.

Therefore, it was confirmed that α6 defensin, galanin, ampyregulin and MIP3-α may be useful markers for colorectal cancer diagnosis as proteins specifically expressed in colorectal cancer.

Example 3 Fabrication and Analysis of Strips

As shown in FIG. 1, an immunochromatographic strip for diagnosing colorectal cancer including anti-α6 defensin, anti-galanine, anti-ampyregulin, and anti-MIP3-α polyclonal antibody was prepared. .

Example 3-1 Preparation of Sample Pad

A cellulose filter (Millipore, USA) was cut into 0.8 cm x 1.2 cm size and used as a sample pad (2).

Example 3-2 Preparation of Anti-α6 Defensin, Anti-Galanine, Anti-Ampiregulin or Anti-MIP3-α Polyclonal Antibodies, Gold Conjugates and Glass Fiber (GF) Filters

Immune response between the colorectal cancer specific antigen in the blood sample and the electric anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies included in the present invention. (GF) The conjugate of the electric polyclonal antibody and the gold particle was temporarily fixed on the surface of the filter (2), and was prepared by the following method.

Gold chloride was reduced to sodium citrate solution to prepare 40 nm-sized gold particles with an absorbance of 10 ± 1 at 532 nm. 10 μg / ml of anti-α6 defensin, anti-galanine, anti-ampyregulin or anti-MIP3-α polyclonal antibody was attached to the electrolytic gold chloride solution, and gold particles were stabilized with polyethylene glycol (PEG) solution. . Meanwhile, a glass fiber filter (1.0 cm x 0.8 cm, Millpore, USA) was divided into quarters with a width of 0.2 cm, and each of the polyclonal antibody-gold conjugates previously prepared was wetted and dried at 37 ° C.

Example 3-3 Preparation of NC Membranes

The NC membrane (nictrocellulose membrane, Millipore, USA) was cut into appropriate sizes (0.8 cm x 5 cm), then divided into quarters of 0.2 cm in width, and then chlorine anti- Rabbit IgG (goat anti-rabbit IgG, Santa-Cruz, USA) was diluted 1:50 in PBST and treated in a straight line, and detection of the colorectal cancer specific antigen at the point 0.8 cm downward in the control line As a result determination line, the anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies included in the present invention were diluted 1:50 (v / v) in PBST, respectively, in a straight line. And then dried at 37 ° C. to prepare an NC film 4 having a control line and a detection result determination line on the film surface.

Example 3-4 Preparation of Absorbent Pads

Absorption pad 7 absorbs unreacted substances in the sample after the immune reaction, thereby moving the sample solution containing the analyte by capillary action, the cellulose filter (Millipore, USA) 0.8cm × 3cm Cut to size was used.

Example 3-5 Adhesive Plastic Backing

As a part for supporting each pad, a commercial plastic plate (Millipore, USA) was used. As shown in FIG. 1, the sample pad 1 prepared in Example 3-1 was placed on the adhesive plastic backing 7, and the anti-α6 defensin prepared in Example 3-2 was placed on it. The glass fiber filters 2 attached to the anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibody-gold conjugate, respectively, were connected in parallel in the above order from the left to the right in parallel, followed by the above-described Example 3 The NC membrane 5 manufactured in -3 and the absorbent pad 6 prepared in Examples 3-4 were mounted in this order, so that the materials partially overlap with each other by about 0.1 cm so that the material can be continuously moved by capillary action. Alignment, assembly, adhesive fixation, and an absorbent paper (Millipore, USA) were attached to the bottom of the membrane to prepare immunochromatographic strips for colorectal cancer diagnosis.

Example 3-6 Analysis of Blood Specimens

Blood was collected from five normal patients, seven colon cancer patients, five pancreatic cancer patients, four ovarian cancer patients, and three brain cancer patients, and then dropped 3 ml of each onto an absorbent pad of an electrochromic immunochromatography strip. After 5 minutes, color development was observed.

As a result, α6 defensin and MIP3-α were specifically detected only in colorectal cancer patients, while ampyregulin was weakly detected in lung cancer patients. On the other hand, galanin was very faintly detected in colorectal cancer patients. Through this, α6 defensin and MIP3-α can be used as markers for colorectal cancer when examined in the form of a strip.Ampireregulin increases the accuracy of diagnosis when used simultaneously with electric α6 defensin and MIP3-α. Confirmed that it can. However, it was confirmed that it is reasonable to raise the concentration of galanin or apply it to a more sensitive diagnostic method.

Example 4 Preparation and Analysis of Enzyme-linked Immunosorbant Assay (ELISA) Kit for Diagnosing Colorectal Cancer

Example 4-1 : Preparation of enzyme immunoassay plate for colorectal cancer diagnosis

Coating buffer (Na ₂ CO ₃ ) for adsorption of the anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibody to a concentration of 1:50 (v / v), respectively. 0.188% (w / v), NaHCO ₃ 0.271% (w / v), NaCl 0.731% (w / v), pH 9.6), and 50 μl / L each on an enzyme immunoassay plate (Nunc, USA). Dispense wells and coat overnight at 4 ° C. The electrocoated plates were washed three times with PBS and then treated at room temperature for 1 hour with blocking buffer (3% (w / v) BSA, 0.05% (v / v) Tween 20 in PBS) to block nonspecific binding. Then, dried, sealed and stored at 4 ° C. until used in the dark.

Example 4-2 Treatment and Analysis of Blood Samples

An electrocoated plate was treated with an electric cancer patient and a blood sample of a normal person 200μl per well, the reaction was slowly shaken at room temperature for 1 hour, and then washed five times with PBST. Then, the anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies diluted 1: 200 (v / v) in PBST, respectively, Dispense 50 μl into wells coated with anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies, treat at room temperature for 2 hours, wash three times with PBST and wash with blocking buffer. Treatment at room temperature for 1 hour blocked nonspecific binding. The wash was then performed twice more, and anti-rabbit goat IgG (Santa Cruz Biotechnology, USA) conjugated with horse raddish peroxidase (HRP) was diluted in blocking buffer at a concentration of 1: 400 (v / v). , Each was dispensed into the wells treated with the antibody and shaken slowly at room temperature for 2 hours to allow binding reaction. Then, it was washed four times with PBST, and color was developed by adding the coloring agent TMB (tetramethyl benzidine, Sigma, USA) according to the manufacturer's concentration, and then stopped by adding 1.25M sulfuric acid solution. Subsequently, the degree of color development of the plate on which color was stopped was measured by absorbance at 450 nm using a microplate reader (Model 680 Microplate Reader, Biorad, USA) to determine the result (see Table 2).

Enzyme Immunoassay Results on Blood Samples of Normal and Various Cancer Patients Cancer specific antigen Normal people Colorectal cancer Pancreatic cancer Ovarian Cancer Brain cancer α6 defensin 0.083 ± 0.016 0.251 ± 0.039 0.075 ± 0.021 0.078 ± 0.024 0.091 ± 0.031 Galanine 0.027 ± 0.008 0.032 ± 0.007 0.028 ± 0.010 0.030 ± 0.008 0.029 ± 0.009 Ampiregulin 0.069 ± 0.017 0.157 ± 0.034 0.072 ± 0.028 0.065 ± 0.013 0.073 ± 0.029 MIP3-α 0.057 ± 0.011 0.137 ± 0.032 0.062 ± 0.019 0.054 ± 0.012 0.063 ± 0.013

As shown in Table 2, for α6 defensin, ampyregulin, and MIP3-α, the absorbance in serum obtained from colorectal cancer patients was more than twice higher than in serum from normal and other cancer patients in normal subjects. Since the enzyme immunoassay, it was confirmed that the onset of colorectal cancer. In the case of galanin, on the other hand, no significant difference could be obtained.

Example 5 Fabrication and Analysis of Protein Chips

Example 5-1 Preparation of Protein Chips

Electric anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies were arranged on a microscope slide glass coated with poly-L-lysine.

First, prior to the attachment of the electrical antibodies, the crosslinker EDC (1-ethyl-3- [3-dimethylaminopropyl] carbodiimide hydrochloride), which is coated with an electropoly-L-lysine, was added at a concentration of 1 mg / ml. It was pretreated for a minute and washed three times with PBS solution. The antibodies were then diluted in PBST at concentrations of 1:50, 1: 100, 1: 200 and 1: 400 (v / v), and dispensed into 96-well microplates, followed by arraying of the antibodies (MicroGrid II). , BioRobotics, USA) was arranged dropwise at 150 μm in size and 400 μm in thickness on a microscope slide glass coated with electric poly-L-lysine. The electric slide glass was divided into 16 sections according to the antibody type and dilution concentration, and each compartment was composed of 48 dots in an area of 1 mm ² . Then, the electric slide glass in which the electric antibodies were arranged was left in a humid chamber for 1 hour at 37 ° C., combined with the electric antibodies, and then taken out and dried. Subsequently, the slide glass was immersed in 100% cold acetone for 1 minute so that the antigen was firmly bound to the slide glass, and then taken out again and dried.

Example 5-2 Serum Analysis of Normal and Various Cancer Patients Using Protein Chips

The protein chip prepared in Example 5-1 was immersed in the blocking buffer used in Example 2, left to stand for 10 minutes, and washed three times with PBST. Subsequently, blood samples of normal persons and various cancer patients obtained in the above Examples 3-6 were dropped by 1 ml on each of the protein chips, which were washed electrically, and allowed to stand at room temperature for 15 minutes and washed three times with PBST. The washed protein chip was immersed in the electric blocking buffer and allowed to stand for 15 minutes, and then washed three times with PBST. Then, after diluting the anti-α6 defensin, anti-galanine, anti-ampyregulin and anti-MIP3-α polyclonal antibodies to the electric blocking buffer at a concentration of 1: 200, 1 ml of the mixed antibody mixture was mixed. The reaction was carried out for 15 minutes at room temperature by dropping the protein chip was washed, and washed three times with PBST. Subsequently, anti-rabbit IgG goat immunoglobulin G (An + -rabbit IgG (H + L)) conjugated with fluorescein isothiocyanate (FITC) diluted 1: 400 in an electric blocking buffer on a protein chip treated with an electropolyclonal antibody. , F (ab ') ₂ , FITC, Goat, Roche Applied Science, USA) was added thereto, and allowed to stand at room temperature for 15 minutes, followed by washing three times with PBST. Then, the protein chip treated with the anti-rabbit IgG goat immunoglobulin G conjugated with the electric FITC was dried at room temperature, and scanned with a flatbed scanner (GenePix Scanner 4000A, Axon Inc, USA) to fluoresce the electric protein chip. The extent was measured and analyzed via quantile-normalization (Table 3).

Measurement of Fluorescence Responses to Blood Samples of Normal and Various Cancer Patients Cancer specific antigen Concentration of antibody (v / v) Normal people Colorectal cancer Pancreatic cancer Ovarian Cancer Brain cancer α6 defensin   1:50 112.2 352.1 105.1 122.1  98.1   1: 100  92.1 311.4  91.3 103.2  83.4   1: 200  72.4 234.2  71.3  82.4  68.4   1: 400  52.3 142.1  42.1  56.3  56.5 Galanine   1:50  31.1  68.1  29.6  33.7  33.1   1: 100  27.1  58.1  22.1  26.5  27.2   1: 200  18.2  32.3  16.5  18.2  19.1   1: 400  10.2  18.3  13.5  12.5  13.1 Ampiregulin   1:50 102.4 234.5 106.5  98.3  86.1   1: 100  84.1 201.5  86.3  83.1  74.1   1: 200  62.3 163.3  64.2  74.1  62.3   1: 400  48.1  91.3  52.1  56.3  46.3 MIP3-α   1:50  93.5 212.4 104.2 100.5  97.3   1: 100  83.5 195.3  90.6  93.2  85.2   1: 200  64.3 154.4  71.3  75.3  68.2   1: 400  52.1 104.5  62.2  61.2  53.4

As shown in Table 3, in the case of α6 defensin, ampyregulin and MIP3-α, colorectal cancers were obtained by diluting the concentration of antibodies specifically bound to 1: 200 (v / v) or more. The degree of fluorescence in the blood sample of the patient was recorded more than twice the degree of fluorescence in the blood sample of normal or other cancer patients. However, in the case of galanin, when the antibody concentration was diluted to 1: 100 (v / v) or more, the fluorescent color of blood samples of colorectal cancer patients or normal cancer patients of normal cancer or other cancer patients was dropped. By recording more than twice the degree, it was confirmed that when the concentration of the antibody used is increased, it can function as a colorectal cancer specific label.

Example 6 Analysis of Random Specimens Using Protein Chips

Based on the results of Example 5-2 above, the concentrations of anti-α6 defensin, anti-ampyregulin and anti-MIP3-α polyclonal antibodies were diluted 1: 200 (v / v) and anti-galanine Dilute the concentration of polyclonal antibody to 1: 100 (v / v) and drip the poly-L-lysine-coated slide glass to produce protein chips, and colon cancer was found in colon cancer. Except for dropping blood samples of 12 subjects, which were unclear, the degree of fluorescence coloration of the electric protein chip was measured in the same manner as in Example 5-2, and analyzed by quantile-standardization. Table 4). In this case, a blood sample of a subject who was found to be a normal person was used as a control.

Colorectal Cancer Diagnosis in Subjects Using Protein Chips Experimental group α6 defensin Ampiregulin MIP3-α Galanine Control     72.5     65.1   59.3   28.1 One     74.2     63.1   63.3   26.2 2     78.5     67.4   57.3   25.1 3     73.1     64.2   64.5   26.3 4     82.4     71.5   67.3   29.1 5     84.1     72.4   63.2   30.2 6    313.1    165.3  156.3   59.1 7     81.4     69.2   57.3   26.3 8     78.5     64.1   65.3   25.4 9     73.1     68.2   62.3   29.1 10     75.3     70.4   71.2   22.6 11    295.5    172.5  161.3   45.1 12     74.1     67.3   66.3   25.3

As shown in Table 4, the degree of fluorescence of α6 defensin, ampyregulin, and MIP3-α was increased more than twice in the blood samples of one blood sample, and α6 defensin, in the other blood sample. The degree of fluorescence development for ampyregulin, MIP3-α and galanin was more than doubled compared to those of normal blood samples. As a result of performing a close examination such as a CT scan on the two subjects, both of them were found to be patients with stage 1 MSI colorectal cancer.

As described in detail and demonstrated above, the present invention provides a colorectal cancer diagnostic kit including a colorectal cancer diagnostic substrate and an electrical substrate capable of detecting a colorectal cancer specific antigen in a blood sample of a subject. The colorectal cancer diagnostic kit of the present invention can be widely used for the early diagnosis of colorectal cancer because it is possible to confirm the onset of colorectal cancer even by blood samples of the subject.

1 is a conceptual diagram of an immunochromatography strip for diagnosing colorectal cancer of the present invention.

Claims (11)

(Iii) anti-α6 defensin antibody, anti-amphiregulin antibody, anti-galanin antibody and anti-MIP3-α antibody (anti at least one antibody selected from the group consisting of: macrophage inflammatory protein 3-α antibody; And, (Ii) A substrate for diagnosing colon cancer, comprising a solid support having an antibody attached thereto. The method of claim 1, Solid phase support is characterized in that the NC (nitrocellulose), PVDF (polyvinylidene fluoride) membrane, microplate, glass substrate, polystyrene, silicon substrate or metal plate Colorectal cancer diagnostic substrate. The method of claim 1, The antibody is characterized in that the polyclonal antibody or monoclonal antibody Colorectal cancer diagnostic substrate. The method of claim 1, Antibodies are attached to a solid phase support by hydrogen bonding, by aldehyde or by poly-L-lysine and linkage. Colorectal cancer diagnostic substrate. A colorectal cancer diagnostic kit comprising: a detection means capable of detecting a colorectal cancer specific antigen bound to the antibody of the colorectal cancer diagnostic substrate of claim 1 and an electric colorectal cancer diagnostic substrate. The method of claim 5, The detecting means is a primary antibody-gold conjugate capable of specifically binding to an antigen bound to an antibody on a substrate. Colorectal cancer diagnostic kit. The method of claim 5, The detection means is characterized in that the primary antibody capable of specifically binding to the antigen bound to the antibody on the substrate and the secondary antibody-signal complex chain that specifically binds to the primary primary antibody. Colorectal cancer diagnostic kit. The method of claim 7, wherein The signal complex is characterized in that the fluorescent material, luminescent material, radioisotope or enzyme Colorectal cancer diagnostic kit. The method of claim 8, The fluorescent material is Cy-3, Cy-5, FITC, GFP (green fluorescent protein), RFP (red fluorescent protein) or Texas Red (Texas Red) characterized in that Colorectal cancer diagnostic kit. The method of claim 8, The enzyme is characterized in that the horse raddish peroxidase (HRP), alkaline phosphatase (beta), beta galactosidase (luciferase) or luciferase (luciferase) Colorectal cancer diagnostic kit. The method of claim 10, It further comprises a coloring reagent causing a color reaction by the enzyme Colorectal cancer diagnostic kit.