Hydrogel Bead CD34 Cell Mimics for Flow Cytometer Calibration
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Solution Overview
Problem
Existing CD34-expressing stem cell controls for flow cytometers are limited by low cell density, inconsistent supply, and poor shelf life, leading to high costs and variability, necessitating the development of acellular compositions that mimic these cells for calibration.
Innovation Solution
Hydrogel beads with CD34 and CD45 extracellular domains are developed, allowing for compositions with varying ratios of these markers to mimic the optical properties of CD34-expressing cells, providing a stable and consistent calibration standard for flow cytometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If commercially available stem cell controls are used for flow cytometer calibration, then calibration can be performed, but the controls have low CD34-expressing cell percentage requiring long sampling times and large control populations
Solution Approach 1:
The patent creates acellular control compositions that copy the optical properties and cell surface marker profiles of CD34-expressing stem cells without using actual cells. These synthetic controls replicate the light scattering and fluorescence characteristics, enabling rapid calibration without the time-consuming sampling required for cell-based controls
Solution Approach 2:
The invention changes the fundamental parameter of the control material from biological cells to acellular synthetic compositions. This transformation allows the controls to be produced in high concentrations with consistent CD34 and CD45 marker expression, eliminating the need for long sampling times while maintaining calibration accuracy
2Measurement precision
If commercially available stem cell controls are used, then calibration is possible, but supply is inconsistent introducing lot-to-lot variability and cost increases
Solution Approach 1:
By creating synthetic copies of cell controls with defined marker profiles, the invention eliminates dependence on biological variability. The acellular compositions can be manufactured with precise control over CD34 and CD45 marker expression levels, ensuring lot-to-lot consistency and reducing variability
Solution Approach 2:
The transition from cell-based to acellular controls fundamentally changes the reliability parameter by removing biological factors that cause supply inconsistency. The synthetic controls can be produced through standardized manufacturing processes, ensuring consistent quality and reducing lot-to-lot variability
3Measurement precision
If mobilized peripheral blood is used to obtain high percentage CD34-expressing cells, then calibration quality improves, but significant cost is introduced
Solution Approach 1:
The patent creates synthetic control compositions that copy the essential calibration properties of CD34-expressing cells without requiring expensive mobilized peripheral blood. The acellular controls can be produced at lower cost while maintaining the high CD34 marker expression levels needed for quality calibration
Solution Approach 2:
The invention changes the material basis from expensive biological samples to cost-effective synthetic compositions. This allows production of high-quality calibration controls with consistent CD34 and CD45 marker profiles at significantly reduced cost, eliminating the need for expensive blood mobilization procedures
4Measurement precision
If cell-based controls are used, then calibration can be performed, but shelf life is poor requiring frequent bridging studies
Solution Approach 1:
The synthetic control compositions replicate the calibration function of cell-based controls without the biological limitations. The acellular nature of these controls provides enhanced stability and shelf life, eliminating the need for frequent bridging studies while maintaining calibration capability
Solution Approach 2:
The fundamental change from cellular to acellular material transforms the shelf life parameter. The synthetic controls are stable over extended periods without degradation, allowing long-term storage and use without the frequent replacement and bridging studies required for cell-based controls
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
The hydrogel beads effectively calibrate flow cytometers, reducing sampling time and cost while maintaining consistency and accuracy in CD34-expressing cell detection, overcoming the limitations of traditional cell-based controls.
Implementation Method 1
Flow cytometry allows for measurement of forward scatter ('FSC') and side scatter ('SSC'), which are parameters that correlate with the cell volume and inner complexity of the particle
Data Source
AI summary
Hydrogel beads with quantifiable attached biomolecules and their use as cell mimics in cytometric applications are described. The cell mimics described herein are selectively tunable to have at least one optical property substantially similar to the at least one optical property of a target cell (e.g., CD34+ stem cell). The disclosure further relates to methods of using the disclosed cell mimics as enrichment controls in cytometric applications.