阅读说明：本技术 一种刺激性促甲状腺激素受体抗体浓度的检测试剂盒 (kit for detecting concentration of stimulated thyroid stimulating hormone receptor antibody ) 是由 赵艳芳 靳增明 付光宇 吴学炜 于 2019-09-17 设计创作，主要内容包括：本发明涉及体外诊断技术领域,特别涉及一种刺激性促甲状腺激素受体抗体浓度的检测试剂盒。该试剂盒包括：包被有刺激性促甲状腺激素受体抗体的磁微粒,含有标记物标记的刺激性促甲状腺激素受体,刺激性促甲状腺激素受体抗体校准品。本发明首次将刺激性促甲状腺激素受体用于刺激性促甲状腺激素受体抗体试剂盒的构建,而该刺激性促甲状腺激素受体与只能与刺激性促甲状腺激素受体抗体进行特异性结合,杜绝了抑制性促甲状腺激素受体抗体和中性促甲状腺激素受体抗体对测量系统的影响。本发明试剂盒检测方法的构建基于高灵敏度的化学发光测定技术,配合高特异性的免疫反应,具有灵敏度高、特异性强和检测范围宽的优点。(the invention relates to the technical field of in-vitro diagnosis, in particular to a kit for detecting the concentration of an antibody of a stimulated thyroid stimulating hormone receptor. The kit comprises: the magnetic particle coated with the stimulating thyroid stimulating hormone receptor antibody contains a stimulating thyroid stimulating hormone receptor marked by a marker and a stimulating thyroid stimulating hormone receptor antibody calibrator. The invention firstly uses the stimulating thyroid stimulating hormone receptor for the construction of the stimulating thyroid stimulating hormone receptor antibody kit, and the stimulating thyroid stimulating hormone receptor can be specifically combined with the stimulating thyroid stimulating hormone receptor antibody only, thereby avoiding the influence of the inhibitory thyroid stimulating hormone receptor antibody and the neutral thyroid stimulating hormone receptor antibody on a measurement system. The construction of the detection method of the kit is based on a high-sensitivity chemiluminescence detection technology, and the kit is matched with high-specificity immunoreaction, and has the advantages of high sensitivity, strong specificity and wide detection range.)

1. a kit for detecting the concentration of an antibody to a thyroid stimulating hormone receptor, comprising: the magnetic particle coated with the stimulating thyroid stimulating hormone receptor antibody contains a stimulating thyroid stimulating hormone receptor marked by a marker and a stimulating thyroid stimulating hormone receptor antibody calibrator.

2. the detection kit according to claim 1, wherein the inner core of the magnetic particles coated with the thyroid stimulating hormone receptor antibody is ferroferric oxide or ferric oxide.

3. The detection kit according to claim 1, wherein the surface modification group of the magnetic particle is one or more of carboxyl, amino, tosyl or streptavidin.

4. The detection kit according to claim 1, wherein the label in the stimulated thyroid stimulating hormone receptor containing the label is one or more of biotin, a ruthenium compound, an acridinium compound, peroxidase, alkaline phosphatase, or a fluorescein compound.

5. The test kit of claim 4, wherein the peroxidase is horseradish peroxidase.

6. The test kit of claim 5, further comprising a luminescent substrate.

7. the detection kit according to claim 6, wherein the luminescent substrate comprises a luminescent substrate A and a luminescent substrate B, and the formula of the luminescent substrate A is as follows: 0.1-0.3M Tris-HCl, 0.1-0.2 mM Luminol, 0.5-0.7 mM hydroxycoumarin, 0.3-0.4 mM gallic acid; the formula of the luminescent substrate B is as follows: 0.8 to 0.9mM amino acid oxidase, 0.7 to 0.9 wt% Tween20, 0.4 to 0.6mM DTPA, and 0.1 to 0.2mM vitamin C.

8. The detection kit according to claim 1, wherein the thyroid stimulating hormone receptor antibody calibrator is a series of calibrators with a concentration of 0 to 100 IU/L.

9. The test kit of claim 8, wherein the concentration of the series of calibrators is 0IU/L, 2IU/L, 5IU/L, 10IU/L, 20IU/L, 40 IU/L.

10. The detection kit according to claim 1, further comprising a concentrated washing solution, wherein the concentrated washing solution is prepared from the following formula: NaH₂PO₄·2H₂O 3～5g，Na₂HPO₄·12H₂60-70 g of O, 202-10 mL of Tween and 1000mL of water.

Technical Field

The invention relates to the technical field of in-vitro diagnosis, in particular to a kit for detecting the concentration of an antibody of a stimulated thyroid stimulating hormone receptor.

Background

TRAb is an autoantibody to the thyroid gland, a heterogeneous specific immunoglobulin produced by B lymphocytes with the aid of T lymphocytes and some cytokines, and the Thyroid Stimulating Hormone Receptor (TSHR) is its major antigen. The Thyroid Stimulating Hormone Receptor (TSHR) is a protein-coupled macromolecular glycoprotein. Human thyroid stimulating hormone receptor is one of the important molecular components of the thyroid gland, and is mainly present on the membrane of thyroid follicular cells (TEC). Under physiological conditions, Thyroid Stimulating Hormone (TSH) is combined with TSHR on a TEC membrane to activate adenylate cyclase and phospholipase C, signals are transmitted through cyclic adenosine monophosphate, inositol 1,4, 5-triphosphate and diglyceride, and the functions of growth, differentiation, synthesis and release of the thyroid hormone of the TEC are regulated.

under the action of heredity and environment, TSHR structure is mutated to generate antigenicity and cause autoimmune reaction, so that thyroid gland autoreactive T cells are activated, and the presenting cell factor is strongly expressed in vivo, thereby promoting the functions of B cells and plasma cells and generating a large amount of TRAbs. Trabs are heterogeneous antibodies and can be classified primarily by their function as thyroid stimulating antibodies (TSAb), thyroid stimulating blocking antibodies (TSBAb), and sex thyroid hormone receptor antibodies. TSAb activates adenylate cyclase through TSHR-coupled excitatory G protein, promotes cAMP increase in thyroid cells, stimulates intracellular cascade reaction, leads to enzyme activation related to thyroid function and growth, stimulates thyroid follicular growth and its function, and leads to hyperthyroidism. TSBAb binds to TSHR and may directly interfere with the binding of TSH to its receptor, thereby reducing the biological effects of TSH. In addition, TSBAb may also inhibit activation of adenylate cyclase to cause methylotrophy. Neutral antibodies bind to TSHR and neither stimulate nor inhibit thyroid function.

thyrotropin receptor antibodies (trabs) are of great value in the development, progression, diagnosis, treatment, prognostic evaluation and other areas of Graves' disease:

1) Diagnosis of Graves' disease: graves' disease (GD for short), also called toxic diffuse goiter, is an organ-specific autoimmune disease accompanied with increased thyroid hormone secretion, belongs to autoimmune thyroid disease (AITD) with chronic lymphocytic thyroiditis, postpartum thyroiditis and the like, has obvious genetic tendency, and has prominent exophthalmos and less anterior tibial myxedema or thick finger tip and the like in clinical manifestations except thyromegaly and hypermetabolic syndrome. GD is an organ-specific autoimmune disease in which autoantibodies and activated T cells are present in the active blood circulation of the disease. The stimulating antibody TSAb in the TRAb is combined with TSHR to stimulate thyroid to cause hyperthyroidism, and the clinical determination of the TRAb has early diagnosis significance on Graves goiter, and the specificity of the TRAb can reach more than 90%. Because TSAb and TSBAb are present in autoimmune thyroid disease patients at the same time, the relative amounts of these two antibodies and their affinity for TSHR determine their ultimate biological effect and are accompanied by changes in thyroid function between hyperthyroidism and hypothyroidism.

2) GD patient treatment follow-up assessment: commonly used antithyroid agents are thioureas such as Methyl Thiouracil (MTU), Propyl Thiouracil (PTU), and imidazoles such as methimazole (MM), which inhibit thyroid peroxidase activity, inhibit iodide-forming active iodine from affecting the iodination of tyrosyl residues, and inhibit the formation of various iodinated thyronine. Studies have shown that TRAb detection decreases during antithyroid drug (ATD) treatment, suggesting a good response to oral ATD. While continuous monitoring of trabs may provide important information about the best opportunity for therapeutic withdrawal. At the end of ATD treatment, TSAb was detected in combination, with TSBAb being more meaningful for GD prognostic assessment than TRAb alone. Therefore, TSAb and TSBAb respectively detect and observe the curative effect of GD, relapse and remission prediction are more valuable, and the TSAb and TSBAb also have indirect guidance on selection of a treatment scheme and stopping taking medicine.

3) Evaluation of thyroid function in fetuses and newborns of gravids with Graves' disease: the prevalence rate of hyperthyroidism of the newborn of a pregnant woman with Graves disease is 1% -2%, and when the pregnant woman has autoimmune thyroid disease and the antibody is positive, the detection of TRAb is helpful for evaluating the thyroid function of the fetus and predicting the possibility that the newborn suffers from the thyroid disease. During pregnancy, especially pregnant women whose late-gestation trabs are maintained in a high-level state have a high risk of their offspring hyperthyroidism, maternal TSAb may cause fetal or neonatal hyperthyroidism through the placenta. At present, TSAb in GD hyperthyroidism maternal blood is used as an important index for predicting hyperthyroidism of newborns. In addition, the mother contains high-titer TSBAb, which can enter the fetus through placenta to cause transient hypothyroidism of the newborn, and the thyroid function returns to normal after several weeks along with the disappearance of TSBAb, which shows that the detection of the mother TSBAb has very important predictive significance for the transient hypothyroidism of the newborn.

At present, TSAb and TSBAb are determined separately using different biological effects produced by TRAb and TSHR binding. The method uses cyclic adenosine monophosphate (cAMP) secondary signal as a biological effect endpoint to detect the activity of stimulatory or inhibitory antibodies in the serum of a patient. When the stimulating antibody TSAb in serum binds to TSHR, an increase in cAMP production is detected. In contrast, when the inhibitory antibody TSBAb binds to TSHR, a decrease in cAMP production is detected. The method has many defects, such as long detection time, complex operation, low efficiency, and easily caused large error of experimental results.

Disclosure of Invention

In view of this, the invention provides a kit for detecting the concentration of an antibody to a thyroid stimulating hormone receptor. The detection kit eliminates the influence of the inhibitory thyroid stimulating hormone receptor antibody on a measurement system and has the advantages of high sensitivity, strong specificity and wide detection range.

In order to achieve the above object, the present invention provides the following technical solutions:

The invention provides a kit for detecting the concentration of a stimulated thyroid stimulating hormone receptor antibody, which comprises: the magnetic particle coated with the stimulating thyroid stimulating hormone receptor antibody contains a stimulating thyroid stimulating hormone receptor marked by a marker and a stimulating thyroid stimulating hormone receptor antibody calibrator.

The detection principle of the invention is that the stimulating thyroid stimulating hormone receptor antibody in human serum or plasma and the stimulating thyroid stimulating hormone receptor antibody coated on the solid phase carrier compete to be combined with the thyroid stimulating hormone receptor marked by the marker.

In the invention, the kit uses the receptor which is only combined with the stimulation thyroid stimulating hormone receptor antibody, so that the kit can be specifically combined with the stimulation thyroid stimulating hormone receptor antibody, and the influence of the inhibition thyroid stimulating hormone receptor antibody and the neutral antibody on a measurement system is eliminated.

in addition, the construction of the detection method is based on a high-sensitivity chemiluminescence detection technology, and the detection kit is matched with high-specificity immunoreaction, has the advantages of high sensitivity, strong specificity and wide detection range, can be matched with a full-automatic instrument for use, realizes full-automatic detection, avoids experiment errors possibly caused by human factors, and improves the detection efficiency.

Preferably, the inner core of the magnetic particles coated with the stimulating thyroid stimulating hormone receptor antibody is ferroferric oxide or ferric oxide.

Preferably, the surface modification group of the magnetic particle is one or more of carboxyl, amino, tosyl or streptavidin.

in the present invention, the thyroid stimulating hormone receptor comprises a fusion protein or a tag for further connection, and the fusion protein includes, but is not limited to, human serum albumin, human immunoglobulin, alkaline phosphatase, horseradish peroxidase, polyhistidine tag, glutathione S transferase tag, and the like.

the label can be a label covalently linked to the thyroid stimulating hormone receptor, or a complex of the thyroid stimulating hormone receptor and the label non-covalently linked to a fusion protein or a tag.

Preferably, the label in the stimulated thyroid stimulating hormone receptor containing the label is one or more of biotin, a ruthenium compound, an acridinium compound, peroxidase, alkaline phosphatase or a fluorescein compound.

Preferably, the peroxidase is horseradish peroxidase.

preferably, the detection kit further comprises a luminescent substrate.

preferably, the luminescent substrate comprises a luminescent substrate A and a luminescent substrate B, and the formula of the luminescent substrate A is as follows: 0.1-0.3M Tris-HCl, 0.1-0.2 mM Luminol, 0.5-0.7 mM hydroxycoumarin, 0.3-0.4 mM gallic acid; the formula of the luminescent substrate B is as follows: 0.8 to 0.9mM amino acid oxidase, 0.7 to 0.9 wt% Tween20, 0.4 to 0.6mM DTPA, and 0.1 to 0.2mM vitamin C.

In the specific embodiment provided by the invention, the formula of the luminescent substrate A is as follows: 0.2M Tris-HCl, 0.15mM Luminol, 0.59mM hydroxycoumarin, 0.35mM gallic acid; the formula of the luminescent substrate B is as follows: 0.85mM amino acid oxidase, 0.8% Tween20, 0.5mM DTPA, 0.12mM vitamin C.

Preferably, the calibration substance for the stimulated thyroid stimulating hormone receptor antibody is a series of calibration substances with the concentration of 0-100 IU/L.

In the specific embodiment provided by the invention, the concentration of the series of calibration substances is 0IU/L, 2IU/L, 5IU/L, 10IU/L, 20IU/L and 40 IU/L.

Preferably, the detection kit further comprises a concentrated washing solution, and the formula of the concentrated washing solution is as follows: NaH₂PO₄·2H₂O 3～5g，Na₂HPO₄·12H₂60-70 g of O, 202-10 mL of Tween and 1000mL of water.

in the specific embodiment provided by the invention, the formula of the concentrated washing liquid is as follows: NaH₂PO₄·2H₂O 4.06g，Na₂HPO₄·12H₂O62.32 g, Tween 205 mL, water make up to 1000 mL.

the invention provides a kit for detecting the concentration of an antibody of a thyroid stimulating hormone receptor, which comprises: the magnetic particle coated with the stimulating thyroid stimulating hormone receptor antibody contains a stimulating thyroid stimulating hormone receptor marked by a marker and a stimulating thyroid stimulating hormone receptor antibody calibrator. The invention has the technical effects that:

1. The invention firstly uses the stimulating thyroid stimulating hormone receptor for the construction of the stimulating thyroid stimulating hormone receptor antibody kit, and the stimulating thyroid stimulating hormone receptor can be specifically combined with the stimulating thyroid stimulating hormone receptor antibody only, thereby avoiding the influence of the inhibitory thyroid stimulating hormone receptor antibody and the neutral thyroid stimulating hormone receptor antibody on a measurement system.

2. The construction of the detection method of the kit is based on a high-sensitivity chemiluminescence detection technology, and the kit is matched with a high-specificity immunoreaction, so that the kit has the advantages of high sensitivity, strong specificity and wide detection range, can be matched with a full-automatic instrument for use, realizes full-automatic detection, avoids experiment errors possibly caused by human factors, and improves the detection efficiency.

Drawings

FIG. 1 is a graph of a standard obtained by the detection method of the present invention;

FIG. 2 is a comparison of the test results of the present invention and a commercial kit for thyroid stimulating hormone receptor antibodies.

Detailed Description

The invention discloses a kit for detecting the concentration of a stimulated thyroid stimulating hormone receptor antibody, and a person skilled in the art can realize the detection by appropriately improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.

In an embodiment of the present invention, the preparation method of the kit of the present invention comprises:

first, preparation of magnetic particle suspension coated with a stimulatory thyroid stimulating hormone receptor antibody

measuring carboxyl magnetic particles according to the using amount, activating by EDC and NHS under an acidic condition, adding a magnetic field after activation is finished, standing to separate the magnetic particles from liquid, discarding supernatant, and washing off redundant activating agent by 0.01M PBS buffer solution with pH7.6; adding a proper amount of stimulating thyroid stimulating hormone receptor antibody, and carrying out oscillation reaction under the alkalescent condition; adding a magnetic field after the reaction is finished, standing to separate the magnetic particles from the liquid, removing the supernatant, sealing by using 0.01M PBS buffer solution containing 1% bovine serum albumin, and adding a sealing solution to store the magnetic particles after the sealing is finished so that the final concentration of the magnetic particles is 0.5 mg/mL; storing the magnetic particle suspension at 2-8 deg.C for use;

Second, preparation of horseradish peroxidase-labeled stimulated thyroid stimulating hormone receptor

the fusion protein is used as a stimulating thyroid stimulating hormone receptor of horseradish peroxidase, the thyroid stimulating hormone receptor is stored in 50% glycerol solution at the temperature of minus 20 ℃ for standby, and the thyroid stimulating hormone receptor is diluted to working concentration by enzyme conjugate diluent when in use;

Thirdly, preparing the stimulating thyroid stimulating hormone receptor antibody series calibration products

the thyroid stimulating hormone receptor stimulating antibody is prepared into a series of calibrators with labeled concentrations of 0IU/L, 2IU/L, 5IU/L, 10IU/L, 20IU/L and 40IU/L by using a calibrator diluent.

Fourthly, preparing luminescent substrate A liquid and luminescent substrate B liquid

The luminescent substrate A solution is prepared by taking 0.2M Tris-HCl, 0.15mM Luminol, 0.59mM hydroxycoumarin and 0.59mM gallic acid;

Luminescent substrate B solution: preparing 0.2M acetic acid-acetate buffer, 0.85mM amino acid oxidase, 0.8% Tween20, 0.5mM diethylenetriamine pentaacetic acid, and 0.12mM vitamin C;

The detection method using the kit for detecting the stimulated thyroid stimulating hormone receptor antibody comprises the following steps:

the first step is as follows: respectively adding a calibrator and a sample into a reaction container, sequentially adding a magnetic particle suspension coated with an irritant thyroid stimulating hormone receptor antibody and an irritant thyroid stimulating hormone receptor marked by horseradish peroxidase, oscillating and incubating;

The second step is that: adding a cleaning solution into the reaction vessel for washing five times;

The third step: and adding a luminescent substrate into the reaction container, measuring the luminous intensity, drawing a standard curve according to the luminous intensity of the calibrator, and calculating the concentration of the stimulated thyroid stimulating hormone receptor antibody in the sample to be tested.

The reagent or the instrument used in the kit for detecting the concentration of the stimulated thyroid hormone receptor antibody provided by the invention can be purchased from the market.

the invention is further illustrated by the following examples: