Cell screening model of unmarked membrane receptor GPR84 and application of cell screening model

A label-free, membrane receptor technology that can be used in compound screening, cells modified by the introduction of foreign genetic material, detection of programmed cell death, etc.

Pending Publication Date: 2022-03-01
TAIZHOU GUOKEHUAWU BIOMEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have certain limitations. The traditional radioligand-receptor binding assay requires washing and filtration, long experimental cycle and low throughput. This technique cannot distinguish receptor agonists and antagonists; the rest The current GPCR detection method is mainly aimed at the activation of a certain signaling pathway, and the activation of multiple pathways cannot be distinguished. It requires fluorescent protein labeling or additional indicators, which is cumbersome to operate, and the addition of indicators will also cause certain damage to the cells, affecting Reliability of Screening Results

Method used

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  • Cell screening model of unmarked membrane receptor GPR84 and application of cell screening model
  • Cell screening model of unmarked membrane receptor GPR84 and application of cell screening model
  • Cell screening model of unmarked membrane receptor GPR84 and application of cell screening model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: DMR characteristic signal spectrum of GPR84 receptor agonist GTPL5846 on HEK293T-Gi3-GPR84 cells

[0039] HEK293T-Gi3-GPR84 human embryonic kidney cells were obtained from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and the inverted microscope was purchased from OLYMPUS. GTPL5846 (product number: HY-1276 (4) and GPR84 antagonist 8 (product number: HY-11256 (2) were purchased from MedChemExpress Company. Culture medium DMEM (product number: 01-052-1ACS) was purchased from Biological Industries Company. Balanced salt solution HBSS (Cat. No.: 14065-056) and HEPES (Cat. No.: 15630-080) were purchased from Gibco. The cell culture plate was an Epic optical biosensing 384 microwell plate, purchased from Corning. The detection platform was Corning’s third-generation Epic ® Imager, purchased from Corning, whose detection signal is the wavelength shift caused by cell dynamic mass reset (DMR).

[0040] HEK293T-Gi3-GPR84 cells in the logarithmic g...

Embodiment 2

[0041] Example 2: Desensitized DMR characteristic signal spectrum of HEK293T-Gi3-GPR84 cells

[0042] HEK293T-Gi3-GPR84 cells in the logarithmic growth phase were seeded in a cell-compatible 384 microwell plate, the medium used was DMEM, the seeding volume per well was 40 µL, and the seeding density was 2.5×10 4 cells / well, place the inoculated cell plate in a cell culture incubator for 20-24 h, until the cell confluency reaches about 95%, and carry out activity detection. Replace the cell culture medium in the microwell plate with Hank's Balanced Salt Solution (HBSS, containing 20 mM HEPES), and add a volume of 30 μL to each well. After adding, place in Epic ® Equilibrate on the imager for 90 min; add different concentrations of GTPL5846 into the microwell plate to pretreat HEK293T-Gi3-GPR84 cells for 90 min, the volume of each well is 10 μL, the concentration is 1000 nM, 500 nM, 250 nM, 125 nM, 62.5 nM, 31.2 nM, 15.6 nM, 7.8 nM, 3.9 nM, 2.0 nM, 1.0 nM, 0.5 nM, 0.2 nM and 0....

Embodiment 3

[0043] Example 3: DMR characteristic signal spectrum of GPR84 receptor antagonist GPR84 antagonist 8 on HEK293T-Gi3-GPR84 cells

[0044] HEK293T-Gi3-GPR84 cells in the logarithmic growth phase were seeded in a cell-compatible 384 microwell plate, the medium used was DMEM, the seeding volume per well was 40 µL, and the seeding density was 2.5×10 4 cells / well, place the inoculated cell plate in a cell culture incubator for 20-24 h, until the cell confluency reaches about 95%, and carry out activity detection. Replace the cell culture medium in the microwell plate with Hank's Balanced Salt Solution (HBSS, containing 20 mM HEPES), and add a volume of 30 μL to each well. After adding, place in Epic ® Equilibrate on the imager for 90 min; re-scan the baseline for 2 min, add different concentrations of GPR84 antagonist 8 into the microwell plate, the volume of each well is 10 μL, the concentration is 10000 nM, 5000 nM, 2500 nM, 1250 nM, 625 nM , 312.5 nM, 156.2 nM, 78.1 nM, 39.0 nM,...

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Abstract

The invention provides a cell screening model of an unmarked membrane receptor GPR84 and application of the cell screening model. Based on an unmarked cell integration pharmacology technology, a method for screening GPR84 receptor agonists and antagonists is established by utilizing a cell line stably expressed by GPR84. The method can also be used for studying modulators affecting downstream pathways of receptors. The GPR84 cell screening model constructed by the invention does not need fluorescence labeling, does not need additional addition of an indicator in the detection process, and has the characteristics of target pathway integration response, no damage to cells, reliable detection result, high sensitivity, high screening flux, short period, simplicity and convenience in operation and the like. The compound is used for searching an agonist, an antagonist and a pathway regulator of the GPR84 receptor from a natural product library, a metabolite library and a combinatorial chemistry library, as well as central nervous system diseases closely related to the GPR84 receptor, such as multiple sclerosis, Alzheimer's disease and the like. And screening drugs for diseases such as endotoxemia, obesity, type 2 diabetes mellitus, dyslipidemia, mixed lineage leukemia, inflammatory bowel disease and the like.

Description

technical field [0001] The invention relates to a method for constructing a cell screening model of an unlabeled G protein-coupled receptor (GPCR) and its application, in particular to a cell screening model of an unlabeled membrane receptor GPR84 and its application. Background technique [0002] G protein-coupled receptors (GPCRs) are seven transmembrane receptors, the number of which is as high as 800. It is the most important type of membrane receptors in cell signal transduction. Plays an important regulatory role and is therefore the drug target of most interest in small molecule drug development. At present, about 34% of the drug targets approved by the FDA are GPCRs, and the GPCRs targeted by these drugs only account for 20% of the total GPCRs, and there are a large number of GPCRs, especially orphan G-protein-coupled receptors (orphan G-protein-coupled receptors, oGPCRs) remain undeveloped and unutilized. GPR84 is a member of the GPCRs family. In the human body, G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N5/10C12Q1/02G01N21/84C12R1/91
CPCG01N33/5044G01N21/84G01N2500/10
Inventor 梁鑫淼侯滔王纪霞赵耀鹏王志伟王俊陆金立
Owner TAIZHOU GUOKEHUAWU BIOMEDICAL TECH CO LTD
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