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Human Procalcitonin Colloidal Gold Quantitative Detection Card

A technology for quantitative detection of human calcitonin, applied to anti-human procalcitonin antibody and its preparation, the application field of the antibody in the detection of human procalcitonin can solve the problem of poor stability of the marker, inability to carry out and detect Time-consuming and other problems, to achieve the effect of easy operation and convenient mass production

Active Publication Date: 2018-01-02
江苏晶红生物医药科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can detect serum PCT of normal people, but it detects the mixture of free PCT, bound PCT and calcitonin gene-related peptide precursor, and cannot distinguish the above three substances; and the detection time is long (19-22h) , Polluted by radioactive elements, poor stability of markers, difficult to handle waste and other shortcomings, which limit its application
Chemiluminescence immunoassay (CLIA) generally needs to be equipped with expensive automatic electrochemiluminescence detectors, which cannot be carried out in conventional laboratories, and it brings unnecessary costs to patients and increases the burden on patients
The electrochemiluminescence immunoassay kit for detecting PCT using the biotin-avidin system also needs to be equipped with an expensive automatic electrochemiluminescence detector, which cannot be carried out in conventional laboratories, and it brings unnecessary costs to patients and increases the number of patients. burden

Method used

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  • Human Procalcitonin Colloidal Gold Quantitative Detection Card
  • Human Procalcitonin Colloidal Gold Quantitative Detection Card
  • Human Procalcitonin Colloidal Gold Quantitative Detection Card

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1. Preparation of anti-human procalcitonin hybridoma cell line

[0035] 1. Animal immunization

[0036] BALB / c female mice (purchased from Changzhou Cavens Experimental Animal Co., Ltd.) were immunized with human recombinant procalcitonin according to the general immunization procedure. For specific immunization conditions, please refer to the "Experimental Guidelines for Antibody Preparation and Use". The serum titer of immunized mice was tracked by indirect ELISA method, and the immunized mouse with the highest serum titer was selected for fusion experiment of mouse splenocytes and mouse myeloma cells.

[0037] 2. Cell Fusion

[0038] (1). Preparation of spleen cells

[0039] Take the immunized mice, remove their eyeballs, take blood, put them to death by breaking the cervical spine, soak them in 75% (v / v) alcohol for 10 minutes, take out their spleens in a sterile operating table, place them in a cell mesh, and grind the cells fully , passed through a sie...

Embodiment 2

[0049] Example 2. Determination of the variable region sequence of the hybridoma cell line antibody

[0050] The sequence of the antibody variable region of the above-mentioned hybridoma cell line was determined.

[0051] a. Extraction of RNA: Extract the total RNA of the above-mentioned hybridoma cell line with reference to the instructions of the Total Cell RNA Extraction Kit (purchased from Roche Company) and perform reverse transcription immediately;

[0052] b. Reverse transcription of RNA into DNA: Refer to Thermo Scientific Reverted First strand cDNASynthesis Kit (purchased from Thermo Company) to reverse-transcribe the total RNA extracted in the previous step to obtain cDNA, and freeze it at -20°C for later use;

[0053] c. PCR amplification and recovery of the variable region sequence: the cDNA obtained in the above step is used as a template, and the variable region sequence of the heavy chain and light chain is sequenced with the general primer for the variable regi...

Embodiment 3

[0056] Example 3. Recombinant expression and purification of single-chain antibody

[0057] According to the sequencing results in Example 2, a connecting peptide (GGGGS) was added between the heavy chain and light chain variable regions of the hybridoma cell strain antibody 3 , introduce six histidine tags (see SEQ ID NO: 9), and fuse the whole gene of histidine tags to perform codon optimization according to the preference of the Pichia pastoris expression system to perform recombinant expression of single-chain antibodies. Its structure is as attached figure 2 shown. The recombinant expression of the above-mentioned single-chain antibody is specifically as follows:

[0058] 1. Construction of expression plasmids for single-chain antibody genes

[0059] The nucleotide sequence of the codon-optimized single-chain antibody is shown in SEQ ID NO:10, and the amino acid sequence is shown in SEQ ID NO:11. The fragment of the optimized single-chain antibody whole gene synthesi...

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Abstract

The present invention relates to anti-human procalcitonin antibody and applications thereof. According to the present invention, a variety of antibodies are prepared, and pairing screening is performed to obtain the antibody combination having sensitivity and specificity, wherein the sensitivity and the specificity can meet the requirements; mass production is convenient, and the large-scale clinical application requirements in the future can be met; and the debugging optimization work of the detection system is performed on the antibody combination to obtain the time-resolved immunofluorescence chromatography quantitative detection card of the human procalcitonin, wherein the operation of the detection card is convenient, and the sensitivity, the specificity and the related detection performance of the detection card can meet the human clinical sample detection.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to an anti-human procalcitonin (PCT) antibody, a preparation method thereof and the application of the antibody in the detection of human procalcitonin. Background technique [0002] Procalcitonin (PCT) is a glycoprotein without hormone activity, composed of calcitonin, calcitonin, and N-terminal residue fragments, and is the precursor of calcitonin (CT). 13KDa, half-life 25-30 hours. Under physiological conditions, PCT is mainly produced by thyroid parafollicular C cells; under pathological conditions, PCT can be derived from various organs and tissues such as liver and lung. [0003] PCT has extensive and important application value in clinic. The plasma PCT content of healthy people is extremely low, lower than 0.5ng / ml in normal human blood. When severe bacterial, fungal, and parasitic infections occur, as well as sepsis and multiple organ failure, its level in plasma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/68
CPCG01N33/6803
Inventor 马永丁娜时振华
Owner 江苏晶红生物医药科技股份有限公司
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