PACAP VIP Peptide Labels for Tumor Cell Detection
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Solution Overview
Problem
Current methods for detecting and diagnosing cancer through circulating tumor cells in biological fluids are complex, require expensive equipment, and lack efficient visual analysis, limiting their effectiveness in early detection and differentiation from normal cells.
Innovation Solution
The use of labeled pituitary adenylate cyclase activating peptide (PACAP) or vasoactive intestinal peptide (VIP) that binds to VPAC1 receptors on tumor cells, allowing for simple and efficient detection of cancer cells in biological fluids like blood or urine using fluorescent or luminescent labels, enabling visualization and differentiation from contaminating cells without the need for expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If immunomagnetic isolation and flow cytometry are used to detect tumor cells, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the detection function from complex flow cytometry systems by using simple fluorescent microscopy. The PACAP-VIP peptide labels specifically bind to tumor cells, allowing direct visualization under a microscope without requiring sophisticated flow cytometry equipment. This extracts the essential detection capability while removing unnecessary system complexity.
Solution Approach 2:
The patent uses inexpensive fluorescently-labeled PACAP-VIP peptides as disposable detection reagents instead of expensive, complex flow cytometry instruments. These peptide labels can be easily synthesized and provide sufficient detection capability at a fraction of the cost of specialized equipment, making the detection system more accessible and simpler to operate.
2Measurement precision
If capillary microscopy is used to confirm cell identity, then measurement precision is improved, but productivity decreases due to manual analysis requirements
Solution Approach 1:
The patent uses fluorescent color changes as a visual indicator of tumor cell presence. The PACAP-VIP peptide labels emit specific fluorescent signals when bound to tumor cells, allowing rapid visual identification and confirmation of cell identity. This color-based detection method maintains high accuracy while enabling faster analysis compared to traditional capillary microscopy, as multiple fields can be scanned quickly without complex manual procedures.
3Measurement precision
If multiple markers are used to exclude non-target cells, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The PACAP-VIP peptide label serves multiple functions simultaneously: it specifically binds to tumor cells, provides fluorescent visualization, and enables differentiation from normal cells through its selective binding affinity. This single multi-functional reagent replaces the need for multiple separate markers and complex staining protocols, significantly simplifying the detection procedure while maintaining high identification accuracy.
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 method allows for the detection of cancer cells at low concentrations, distinguishing them from normal cells, and can identify early-stage cancers, facilitating early diagnosis and monitoring of cancer progression or recurrence without requiring advanced equipment or extensive training.
Implementation Method 1
contacting a biological fluid with a labeled pituitary adenylate cyclase activating peptide (PACAP) or vasoactive intestinal peptide (VIP), and determining binding of the PACAP or VIP to shed or circulating tumor cells in the biological fluid
Implementation Method 2
using fluorescent or luminescent labels, enabling visualization and differentiation from contaminating cells
Implementation Method 3
using fluorescent or luminescent labels, enabling visualization and differentiation from contaminating cells
Data Source
AI summary
This invention relates to a method for detecting shed or circulating tumor cells in a biological fluid using labeled pituitary adenylate cyclase activating peptide or vasoactive intestinal peptide.