NK Cell Microparticle Identification Without Centrifugation
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Solution Overview
Problem
Current methods lack the ability to identify and characterize microparticles released by natural killer cells, which are crucial for understanding immune responses, particularly in viral infections and cancer, due to the absence of established markers and efficient analysis techniques.
Innovation Solution
The identification and characterization of microparticles expressing NKp30 and NKp46 surface markers and containing perforins and cytokines like IFNγ and TNFα, using a method that involves stimulation of NK cells with PMA and ionomycin, followed by intracytoplasmic and surface staining without washing, allowing for phenotypical and functional analysis in biological fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If microparticles are isolated using differential centrifugation, then microparticles can be separated from biological fluids, but microparticles are reduced in numerical terms due to loss during processing
Solution Approach 1:
The patent extracts only the essential identifying features (surface markers NKp30 and NKp46, and intracellular contents perforins and cytokines) from the microparticles, allowing identification without physical isolation. This eliminates the need for centrifugation and associated particle loss.
Solution Approach 2:
The patent uses specific antibodies and staining reagents as intermediaries to detect microparticle markers. These intermediaries enable indirect identification of microparticles in biological fluids without requiring direct physical manipulation or centrifugation of the particles themselves.
2Adaptability or versatility
If microparticles are identified using conventional markers (Annexin V, CD31, CD41), then microparticles from various cell types can be detected, but microparticles from natural killer cells cannot be specifically identified
Solution Approach 1:
The patent applies the principle of local quality by identifying microparticles through their specific local characteristics - surface markers NKp30 and NKp46 combined with intracellular perforins and cytokines. This specific marker combination uniquely identifies NK cell-derived microparticles, distinguishing them from microparticles of other cell types that would express different marker profiles.
3Reliability
If washing steps are included in the analysis method, then non-specific binding is reduced, but microparticles are lost through dilution and handling
Solution Approach 1:
The patent performs preliminary blocking of Fc receptors before staining to prevent non-specific binding of antibodies. This preliminary action eliminates the need for subsequent washing steps that would cause microparticle loss, as the blocking step prevents background noise from the outset.
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 enables high-quality identification and functional analysis of microparticles from NK cells, providing a tool for monitoring immune responses and potentially aiding in the control of viral infections and tumors, without the loss of microparticles through centrifugation.
Implementation Method 1
stimulation of NK cells with PMA and ionomycin, followed by intracytoplasmic and surface staining
Implementation Method 2
surface staining with monoclonal antibodies anti-CD56, anti-CD16, anti-NKp30, anti-NKp46
Implementation Method 3
acquisition using a cytofluorimeter
Data Source
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Figure 2
AI summary
The present invention relates to a method for the identification and phenotypic analysis of the microparticles released from natural killer cells in plasma or serum or supernatants deriving from cell cultures and the relative uses as a tool for studying these cells under physiopathological situations.