Recombinant Neural Cell Line for Ah Receptor Detection
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Solution Overview
Problem
Current methods for measuring aryl hydrocarbon receptor transcriptional activation are time-consuming and lack sensitivity, making it difficult to detect test substances at low concentrations.
Innovation Solution
A recombinant cell line is developed by stably transfecting a reporter construct and an exogenous Ah receptor gene into neural cells, which includes a responsive sequence and a reporter gene linked to a promoter, enabling the detection of low concentrations of test substances like 2,3,7,8-TCDD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If transient transfection method is used to measure Ah receptor activation, then the measurement can be performed quickly, but the detection sensitivity is insufficient and cannot detect low concentrations of test substances
Solution Approach 1:
The patent applies preliminary action by establishing stable transfectant cell lines in advance that permanently express the reporter construct and Ah receptor. This preparation work is done beforehand, allowing rapid measurements without compromising sensitivity, as the cells are pre-configured to respond reliably to test substances at low concentrations.
Solution Approach 2:
The patent changes the parameter of cell line stability from transient to stable transfection. This parameter change enables the system to maintain high detection sensitivity over extended periods while allowing efficient batch processing of multiple test substances, thus improving both sensitivity and measurement efficiency.
2Measurement precision
If stable transfection method is used to improve detection sensitivity, then low concentrations of test substances can be detected, but the cell line establishment becomes more complex
Solution Approach 1:
The patent merges the reporter construct and Ah receptor expression into a single stable transfectant cell line. This combination simplifies the overall system by integrating multiple functional elements into one cell line, reducing the complexity of managing separate transient transfections while maintaining high detection sensitivity.
3Productivity
If conventional reporter gene assay is used, then the basic measurement capability is provided, but the measurement efficiency and throughput are low
Solution Approach 1:
By preparing stable transfectant cell lines in advance, the patent eliminates the time-consuming transient transfection step for each measurement. The preliminary establishment of responsive cell lines enables high-throughput screening of multiple test substances, significantly improving measurement efficiency and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the stable and sensitive measurement of transcriptional activation potency, enabling the detection of test substances at concentrations as low as 0.1 pg/ml, significantly improving detection limits and measurement efficiency.
Implementation Method 1
If dioxin-like substances bind to the Ah receptor, this receptor is activated and translocates into the nucleus. After that, the receptor hetero-dimerizes with an Ah receptor nuclear translocator (hereinafter referred to as an 'Arnt'). This dioxin-like-substance-binding Ahr/Arnt complex binds to specific promoter element termed dioxin responsive element (DRE) on a chromosome to activate the transcription of genes located downstream of the responsive element.
Implementation Method 2
a reporter construct is made by linking a reporter gene, an indicator of Ah receptor activation potency, to the downstream of the responsive element, then the construct obtained thereby is introduced into a cell, and the cell is exposed to a test substance, followed by culturing, to measure the amount of reporter gene expression
Data Source
AI summary
According to one embodiment, a cell for measuring a level of Ah receptor transcriptional activation is provided. The cell is derived from a neural cell. The cell contains a chromosome into which a reporter construct and an Ah receptor gene are introduced. The reporter construct has a sequence represented by SEQ ID NO: 1 and a reporter gene operably linked to the downstream of the nucleotide sequence. The sequence represented by SEQ ID NO: 1 has a recognizing sequence of an Ah receptor and a nucleotide sequence which is operably linked to the downstream of the recognizing sequence and required to initiate transcription.