CN117677715A - Myeloma biomarker SERPINF2 and application thereof - Google Patents
Myeloma biomarker SERPINF2 and application thereof Download PDFInfo
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Abstract
The invention relates to the technical fields of molecular biology and biological medicine, in particular to a myeloma biomarker and application thereof. According to the application of the invention, by detecting the expression level of the SERPINF2 gene or the SERPINF2 protein in the subject, whether the subject has myeloma or whether the subject is at risk of having myeloma or whether the prognosis of the subject is good can be judged, so that a clinician is guided to provide an effective preventive means or treatment scheme for the subject, and the survival rate of the subject can be improved.
Description
The invention relates to the technical field of molecular biology and biological medicine, in particular to a myeloma biomarker (SERPINF 2) and application thereof.
Myeloma (also known as plasmacytoma) is a malignant tumor that originates in plasma cells in bone marrow, and is a more common malignancy. There are single shot and multiple shot. Multiple myeloma, also known as Multiple Myeloma (MM) is a malignant change of plasma cells with synthetic and secretory immunoglobulins, and a large number of monoclonal malignant plasma cell hyperplasia causes easily affected soft tissues, and can be widely transferred in late stage, but rarely transferred in lung. The spine is more common, accounting for 10% of the primary tumors of the spine, and the lumbar spine is common. Is more common in men over 40 years old and has a ratio of about 2:1 between men over 40 years old and women. The good hair parts are vertebrae, ribs, skull, sternum, etc. In recent years, the incidence of MM has increased, and the age of onset has also decreased.
Multiple myeloma has slow onset, no obvious symptoms in early stage, various clinical manifestations, frequently causes misdiagnosis and missed diagnosis, and finally leads to delayed illness. Diagnosis of multiple myeloma generally requires bone marrow biopsy, imaging examination, blood examination, etc., and differential diagnosis in combination with clinical manifestations. The international staging system (R-ISS) revised for multiple myeloma incorporates plasma biomarkers (lactate dehydrogenase, beta 2-microglobulin, and albumin) and cytogenetic abnormalities of known prognostic significance to predict disease behavior, but the heterogeneity of different patients is relatively large. Hematopoietic stem cell transplantation is the most effective method for treating multiple myeloma, and is limited in clinical application due to the influence of factors such as bone marrow sources, HLA (high level architecture) matching, high medical cost and the like, and chemotherapy is still the main treatment strategy, but patients are easy to produce phenomena such as drug resistance, intolerance and the like along with the progress of drug treatment. In response to these problems, it is necessary to find a simple, noninvasive, sensitive, rapid, and highly specific diagnostic, therapeutic, and prognostic strategy.
Disclosure of Invention
In a first aspect of the invention there is provided the use of a product for detecting a SERPINF2 gene or SERPINF2 protein in the manufacture of a tool for the diagnosis and/or prognosis of myeloma.
Specifically, the product for detecting SERPINF2 gene or SERPINF2 protein includes a product for detecting the expression level of SERPINF2 gene or SERPINF2 protein.
In particular, a product that detects a SERPINF2 gene may include a nucleic acid that is capable of binding to the SERPINF2 gene.
Specifically, products that detect the SERPINF2 gene may perform their function based on known methods using nucleic acid molecules: for example, polymerase Chain Reaction (PCR), southern blot hybridization, northern blot hybridization, dot hybridization, fluorescence In Situ Hybridization (FISH), DNA microarray, high throughput sequencing platform, etc., may be employed, in particular, PCR methods such as real-time fluorescent quantitative PCR method. The product can be used to perform an analysis qualitatively, quantitatively, or semi-quantitatively.
Specifically, the nucleic acid contained in the product for detecting the SERPINF2 gene may be obtained by chemical synthesis, or by preparing a gene containing a desired nucleic acid from a biological material and then amplifying it using a primer designed for amplifying the desired nucleic acid.
Specifically, the nucleic acid may include primers that specifically amplify the SERPINF2 gene.
In particular, the nucleic acid may also include a probe that specifically recognizes the SERPINF2 gene.
Specifically, the product for detecting the SERPINF2 gene may be a reagent, a kit, a test paper, a gene chip, or the like, which may contain a nucleic acid capable of binding to the SERPINF2 gene (e.g., a primer for specifically amplifying the SERPINF2 gene and/or a probe for specifically recognizing the SERPINF2 gene); the product of detecting the SERPINF2 gene may also be a high throughput sequencing platform that can detect the SERPINF2 gene using a nucleic acid capable of binding to the SERPINF2 gene (e.g., a primer that specifically amplifies the SERPINF2 gene and/or a probe that specifically recognizes the SERPINF2 gene).
In particular, a product that detects SERPINF2 protein may include a substance (e.g., an antibody or fragment thereof) that is capable of binding to SERPINF2 protein.
Specifically, products that detect SERPINF2 proteins can function based on known methods of using proteins: for example, ELISA, radioimmunoassay, immunohistochemistry, western blot, proteomics (e.g., antibody chips, mass spectrometry (e.g., data independent acquisition (Data Independent Acquision, DIA) mass spectrometry), etc. can be employed.
In particular, a product that detects SERPINF2 protein may include an antibody or fragment thereof that specifically binds to SERPINF2 protein. Antibodies or fragments thereof of any structure, size, immunoglobulin class, origin, etc. may be used as long as it binds to the target protein. Antibodies or fragments thereof included in products for detecting SERPINF2 protein may be monoclonal or polyclonal. An antibody fragment refers to a portion of an antibody (a fragment of a portion) or a peptide containing a portion of an antibody that retains the binding activity of the antibody to an antigen. Antibody fragments may include F (ab ') 2, fab', fab, single chain Fv (scFv), disulfide bonded Fv (dsFv) or polymers thereof, dimerized V regions (diabodies), or CDR-containing peptides. Products for detecting SERPINF2 protein may include an isolated nucleic acid encoding an antibody or an amino acid sequence encoding an antibody fragment, a vector comprising the nucleic acid, or a cell carrying the vector. Antibodies can be obtained by methods well known to those skilled in the art, and available commercial products can also be used.
Specifically, the product for detecting SERPINF2 protein may be a reagent, a kit, a test paper, a gene chip, or the like, which may contain a substance (e.g., an antibody or a fragment thereof) capable of binding to SERPINF2 protein; the product for detecting the SERPINF2 protein can also be an instrument platform, and can comprise a measuring module (used for measuring the content of the SERPINF2 protein in a sample to be detected) and an analyzing module (used for analyzing the content difference of the SERPINF2 protein in the sample to be detected and a reference sample).
In particular, the measurement module may be based on mass spectrometry, such as DIA-MS, wherein the DIA acquisition scheme consists of 32 fixed windows, with an acquisition range of 400-1200 mass to charge ratios (m/z).
Specifically, when the product for detecting SERPINF2 protein is an instrument platform, the sample to be detected is subjected to pretreatment before detection, and the pretreatment may include: diluting a sample to be tested by using a lysis buffer solution, reducing disulfide, carrying out alkylation treatment, enzymolysis, acidification and desalination; specifically, the pretreatment may include: the sample to be tested was diluted with urea solution, reduced with Dithiothreitol (DTT) in a 37 ℃ water bath, then alkylated at 25 ℃ with 500mmol/L Iodoacetamide (IAA) in the absence of light, enzymatically digested with trypsin at 37 ℃, the enzymatically digested peptide acidified with trifluoroacetic acid solution (Trifluoroacetic acid, TFA, ph=2-3), then desalted with C18 desalting column, and the desalted peptide was dried under vacuum and then dissolved in a buffer containing 0.1% formic acid and 2% acetonitrile, and the quantified peptide was isolated with analytical column for DIA-MS analysis.
In particular, myeloma includes single myeloma and multiple myeloma, particularly multiple myeloma.
In particular, for the detection of SERPINF2 genes or SERPINF2 proteins, a tissue sample or fluid obtained, for example, from a biopsy subject, such as tissue, blood, plasma, serum, lymph, urine, serosal cavity fluid, spinal fluid, synovial fluid, aqueous humor, tears, saliva, etc. or fractions thereof or treated material may be used.
In one embodiment of the invention, the sample for detection of the SERPINF2 gene or SERPINF2 protein is blood (in particular peripheral blood) or a fraction thereof (e.g. serum) of the subject, in particular serum.
In a second aspect of the invention there is provided a tool for diagnosis and/or prognosis of myeloma comprising a product that detects the SERPINF2 gene or SERPINF2 protein.
Specifically, products for detecting SERPINF2 gene or SERPINF2 protein have the corresponding definition of the invention as described above.
In particular, the tools may be reagents, kits, test papers, gene chips, high throughput sequencing platforms, proteomic analysis products (e.g., antibody chips, DIA-MS), etc.
In a third aspect of the invention there is provided the use of an inhibitor of a SERPINF2 gene or SERPINF2 protein in the manufacture of a medicament for the treatment of myeloma.
In particular, the inhibitor is capable of inhibiting the expression or activity of a substance of the upstream or downstream pathway of SERPINF2.
In a fourth aspect of the invention there is provided a medicament for the treatment of myeloma comprising an inhibitor of the SERPINF2 gene or SERPINF2 protein.
In a fifth aspect of the invention, there is provided a method of diagnosing or prognosing myeloma comprising the step of detecting a SERPINF2 gene or a SERPINF2 protein.
Specifically, the method may include the steps of:
(1) Obtaining a subject sample;
(2) Detecting the expression level of a SERPINF2 gene or a SERPINF2 protein in a sample of the subject;
(3) Correlating the measured expression level of the SERPINF2 gene or SERPINF2 protein to the presence or absence of the disease in the subject.
In particular, if the expression level of the SERPINF2 gene or SERPINF2 protein is increased as compared to a normal control, the subject can be diagnosed with or at high risk of developing myeloma, or the subject can be determined to have a poor prognosis. It should be noted that, the risk, severity and prognosis of a specific disease also require comprehensive assessment by a clinician in combination with other detection indicators of the subject.
In particular, myeloma includes single myeloma and multiple myeloma, particularly multiple myeloma.
In particular, the sample may use, for example, a tissue sample or fluid obtained from a biopsy subject, e.g., tissue, blood, plasma, serum, lymph, urine, serosal cavity fluid, spinal fluid, synovial fluid, aqueous humor, tears, saliva, etc., or fractions or treated materials thereof. In one embodiment of the invention, the sample is blood (in particular peripheral blood) or a fraction thereof (e.g. serum) of the subject, in particular serum.
In particular, the subject is a mammal, particularly a human.
In a sixth aspect of the invention, there is provided a method of treating myeloma comprising inhibiting a SERPINF2 gene or a SERPINF2 protein.
Specifically, the method comprises inhibiting the expression of a SERPINF2 gene and/or inhibiting the activity of a SERPINF2 protein.
In a seventh aspect of the invention, a method of screening for a tumor drug may comprise detecting the expression level of a SERPINF2 gene or a SERPINF2 protein after administration of a test drug to tumor cells or at a time period after administration of a test drug to a tumor model animal to evaluate the effect of the test drug on improving tumor prognosis.
Specifically, when the expression level of the SERPINF2 gene or SERPINF2 protein decreases or returns to normal levels after administration of a test agent, the agent may be selected as a therapeutic agent for improving tumor prognosis.
In particular, the tumour is a myeloma, in particular multiple myeloma.
According to the invention, the serum sample is analyzed by DIA-MS to obtain differential protein, potential diagnosis markers are selected, an antibody chip is prepared according to the selected diagnosis markers, and the stability and the specificity of the antibody chip are evaluated. The myeloma markers screened by the invention can be used for detecting and screening myeloma patients with high sensitivity and high specificity. The antibody chip prepared by the invention has high stability and high sensitivity, and can be used for clinical detection. The myeloma serum marker and the prepared antibody chip screened by the invention can greatly improve the detection efficiency of myeloma, realize early diagnosis and effectively reduce the detection cost under the detection platform of a high-flux chip. According to the application of the invention, by detecting the expression level of the SERPINF2 gene or the SERPINF2 protein in the subject, whether the subject has myeloma or whether the subject has the risk of having myeloma or whether the prognosis of the subject is good can be judged, so that a clinician is guided to provide an effective prevention means or treatment scheme for the subject, the survival rate of the subject can be favorably provided, and a new drug target can be provided for the development of myeloma treatment drugs.
FIG. 1 shows the detection results of DIA-MS mass spectrometry on a target on SERPINF2 protein.
FIG. 2 shows the results of the validation of myeloma diagnostic markers by antibody chips.
FIG. 3 shows a volcanic chart of mass spectra and antibody chip detection results.
FIG. 4 shows representative results of antibody chip detection.
Unless defined otherwise, all scientific and technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention relates.
Alpha-2 antiplasmin (serpin peptidase inhibitor clade F member, SERPINF 2), abbreviated herein as SERPINF2.
In the present invention, "expression level" refers to a measurable amount of a SERPINF2 gene product in a sample, wherein the gene product may be a transcript or a translation product. Thus, expression levels are related to nucleic acid gene products (e.g., mRNA or cDNA) or polypeptide gene products (e.g., SERPINF2 protein).
In the present invention, "SERPINF2 gene" includes polynucleotides of the SERPINF2 gene itself as well as any functional equivalent of the SERPINF2 gene, e.g., DNA sequences that have 70% or more (e.g., 80% or more, 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, 99% or more, 99.5% or more) homology to the SERPINF2 gene DNA sequences in the current international public nucleic acid sequence database GeneBank, and encode the same functional protein.
In the present invention, "diagnosing myeloma" includes both determining whether a subject has already suffered from myeloma and determining whether a subject is at risk of suffering from myeloma.
In the present invention, "prognosis" refers to the course or outcome of a myeloma patient after suppression or alleviation of myeloma by surgical treatment or the like. In this specification, prognosis may be the inhibition or alleviation of the state of vitality 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20 years or more after myeloma by surgical treatment. Prognosis can be predicted by examining biomarkers, i.e., SERPINF2 genes or SERPINF2 proteins. Prognosis prediction may be performed as follows: whether the prognosis of the patient is good or poor, or the probability of a good prognosis or poor prognosis, is determined based on the presence or absence, or elevation or depression, of the biomarker.
In the present invention, "good prognosis" means that a patient has no critical condition for a long period of time (e.g., 3, 5, 6, 7, 8, 9, 10, 15, 20 years or more) after suppressing or alleviating myeloma for the patient by surgical treatment or the like. Alternatively, "good prognosis" may mean survival, no metastasis, no recurrence over such a long period of time. For example, "good prognosis" may mean the presence of at least 3 years or in particular at least 5 years, preferably without metastasis or recurrence. The most preferred state for good prognosis is long-term disease-free survival. In the present invention, "good prognosis" may also include a state that: diseases such as metastasis can be found, but nausea is low and does not seriously affect viability.
In the present invention, "bad prognosis" refers to a fatal condition of a patient within a short period (e.g., 1, 2, 3, 4, 5 years or less) after suppression or alleviation of myeloma by surgical treatment or the like. Alternatively, "poor prognosis" refers to death, metastasis or recurrence within such a short period of time. For example, "poor prognosis" may mean recurrence, metastasis or death for at least 3 years, particularly at least 5 years.
Predictive prognosis refers to a process or outcome that predicts a patient's condition and is not meant to predict a process or outcome of a patient's condition with 100% accuracy. Prediction prognosis refers to determining whether the likelihood of a certain process or result increases, and is not meant to determine the likelihood of a certain process or result occurring by comparison to a situation where a certain process or result does not occur. As in the present invention, in patients with elevated or reduced levels of the SERPINF2 gene or SERPINF2 protein in the present invention, a particular process or outcome is more likely to be observed than in patients that do not exhibit this characteristic.
Various publications, patents, and published patent specifications cited herein are incorporated by reference in their entirety.
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: screening of myeloma diagnostic markers
1. Sample collection
Sample collection was carried out in the Beijing Kogyo Hospital affiliated to the university of capital medical science, 22 healthy volunteers (N) were recruited in the Kogyo Hospital, the average age of the volunteers was 57.95 + -3.40 years, and the ratio of men and women was 8:3, as a control group; patients with clinically diagnosed myeloma were selected, and the average age of myeloma patients (MM) was 58.16 ±9.14 years, male and female ratio 8:3, all patients obtained informed consent.
2. Myeloma diagnostic marker screening
And (3) carrying out mass spectrometry detection on the samples by using a DIA-MS technology to obtain differential proteins of two groups of samples of N and MM and selecting potential diagnostic markers.
The DIA-MS analysis steps were as follows:
mu.L of serum sample was added to a 1.5mL centrifuge tube, diluted with 6mol/L urea (from Sigma, USA) in lysis buffer and disulfide reduced with 10mmol/mL Dithiothreitol (DTT) in a 37℃water bath for 60min; then alkylation with 500mmol/L Iodoacetamide (IAA) at 25deg.C for 45min in the absence of light; performing enzymolysis with 0.04mg/ml pancreatic protease at 37deg.C for 16 hr; acidifying the enzymatically digested peptide with 1% trifluoroacetic acid (Trifluoroacetic acid, TFA, ph=2-3), desalting with a C18 desalting column, drying the desalted peptide under vacuum, and dissolving in 20 μl of buffer containing 0.1% formic acid and 2% acetonitrile; the concentration of the peptide was detected by a Nanodrop scanner under UV light with absorbance at A280nm, separated by analytical column (150 μm. Times.250 mm) to give 1.5. Mu.g of peptide, which was injected into a QE-HF (Q Exactive HF Hybrid Quadrupole OrbitrapTM, thermo Fisher) mass spectrometer with a DIA acquisition scheme consisting of 32 fixed windows with acquisition ranges of 400-1200 mass to charge ratios (m/z) and MS1 and MS2 resolution profiles of 60000 and 30000. The original file is imported Spectronaut pulsar for analysis, and parameters are software defaults.
The results of mass spectrometry screening for myeloma diagnostic markers are shown in figure 1.
Example 2: antibody chip analysis of myeloma diagnostic markers
The potential diagnostic markers obtained in example 1 were validated using a custom-made antibody chip.
1. Preparation of antibody chips
(1) Experimental materials
SERPINF2 antibodies were purchased from R & D company under the accession number: MAB1470-SP.
Negative control: 100. Mu.g/mL BSA and 1 XPBS.
Positive control: 10 μg/mL Alexx-55-goat anti-human IgG; biotin-IgG at 100. Mu.g/mL.
(2) The preparation method comprises the following steps:
by using an Ultra Marathon II spotter of Arrayjet, various antibodies, negative control and positive control were spotted on a three-dimensional substrate D (Boao biological group Co., ltd., beijing) of a chip, and the spotted chip was placed in a closed environment with a humidity of 60% and a temperature of 25℃for 2 hours and stored in a refrigerator at-20℃for use.
2. Antibody chip detection flow
(1) Experimental materials
Sample dilution 1 XPBS (137mMNaCl,2.7mMKCl,10mM Na) 2 HPO 4 ,2mM KH 2 PO 4 );
Wash 0.05% pbst (0.05% Tween,1 x PBS), available from amerco company, usa;
5% milk sealer (5% milk, 1 XPBST), skim milk powder was purchased from BD company of America;
biotin labelling reagent (NHS-PEG 4-Biotin), fluorescent dye (Strepitavidin, R-Phycoerythrin Conjugate (SAPE)) were purchased from Thermo Fisher Scientific company, USA;
BSA (Albumin from bovine serum) from Sigma-Aldrich, USA;
biochip scanner (4300A), available from apparatus company of Molecular Devices, U.S.A.;
incubation discs (3/5) were purchased from PEPEPPRPRIT, germany;
temperature controlled mixers (MixMate) and bench top centrifuges (centrifuges 5810R), available from Eppendorf corporation, germany;
micro separation column Bio-Spin6, available from Bio-Rad, inc., USA;
PCR-384M2-C microwell plates were purchased from Axygen, inc. of America.
(2) The experimental steps are as follows:
labeling of serum samples:
all serum protein molecules were labeled with biotin using the method described in Xu, m., deng, j., xu, k.et al, in-depth serum proteomics reveals biomarkers of psoriasis severity and response to traditional Chinese media. As shown in FIG. 2, 10. Mu.L of serum was diluted with 90. Mu.L of filtered 1 XPBS, then the serum was labeled with 1. Mu.L of biotin labeling reagent, incubated at room temperature for 1 hour, and after centrifugation at 1000 Xg for 2min using a Bio-Spin6 separation column (Bio-Rad, USA) to remove excess biotin molecules, the collected biotinylated proteins were dissolved in 500. Mu.L of 1 XPBS containing 5% skim milk and stored at-20 ℃.
Detection of serum samples:
the antibody chips were removed from the-20deg.C refrigerator, allowed to stand at room temperature for 30min and then mounted on incubation plates (PEPEPERPRINT, germany), one rail for each array;
(1) Closing: after centrifugation 500 μl of 5% skimmed milk (solvent 0.05% pbst) was slowly added to each pen of the incubation plate and incubated for 1h at room temperature;
(2) Sample adding: sucking milk in the incubation tray by a vacuum pump, adding the treated serum markers into each rail of the incubation tray, and reacting overnight on a shaking table at 4 ℃;
(3) Washing: the solution in the incubation plate was aspirated by a vacuum pump, washed three times with 0.05% pbst (1 x PBS containing 0.05% tween), 10min each time, and then washed three times with deionized water, 5min each time;
(4) Adding fluorescent dye: adding 2mg/L fluorescent dye (5% skimmed milk as solvent) into the array of the chip, and incubating at room temperature in dark place for 1h;
(5) And (5) washing in dark: the operation is the same as in the step (3);
(6) And (3) chip detection: and (5) airing the chip, scanning by a fluorescent chip scanner, and extracting fluorescent signal data.
The results of the antibody chip detection are shown in FIG. 2.
The volcanic diagram of the mass spectrum and the detection result of the antibody chip is shown in fig. 3.
Example 3: clinical detection accuracy of antibody chips
FIG. 4 shows representative results of antibody chip detection, wherein Panel A shows the results of detection of healthy human antibody chips, panel B shows the results of detection of myeloma patients, and the inventors found that the signal at the midpoint of Panel B is generally stronger than that of Panel A. Preliminary elucidation shows that myeloma patients have more up-regulated proteins in the serum of healthier people.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
The foregoing embodiments and methods described in this invention may vary based on the capabilities, experience, and preferences of those skilled in the art.
The listing of the steps of a method in a certain order in the present invention does not constitute any limitation on the order of the steps of the method.
Claims (10)
- Use of a product for detecting a SERPINF2 gene or a SERPINF2 protein in the manufacture of a tool for the diagnosis and/or prognosis of myeloma.
- The use of claim 1, wherein the product comprises a product that detects the expression level of a SERPINF2 gene or a SERPINF2 protein.
- The use of claim 1, wherein the product comprises a nucleic acid capable of binding to a SERPINF2 gene or a substance capable of binding to a SERPINF2 protein.
- The use according to claim 1, wherein the product is selected from the group consisting of: reagents, kits, test paper, gene chips, high-throughput sequencing platforms, antibody chips and instrument platforms;preferably, the instrument platform comprises a measurement module for measuring the content of SERPINF2 protein in the sample to be measured.
- The use of claim 1, wherein the myeloma comprises single myeloma and multiple myeloma.
- Use according to claim 1, wherein the sample for the detection of the SERPINF2 gene or SERPINF2 protein is blood or a fraction thereof, preferably serum, of a subject.
- A tool for diagnosis and/or prognosis of myeloma comprising a product that detects a SERPINF2 gene or a SERPINF2 protein.
- Use of an inhibitor of a SERPINF2 gene or SERPINF2 protein in the manufacture of a medicament for the treatment of myeloma.
- The use of claim 8, wherein the inhibitor is capable of inhibiting the expression or activity of a substance of the upstream or downstream pathway of SERPINF2.
- A medicament for treating myeloma comprising an inhibitor of the SERPINF2 gene or SERPINF2 protein.
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