Renal Epithelial Cell Propagation Yield Optimization
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Solution Overview
Problem
Current renal replacement therapies for acute and chronic renal failure are suboptimal, failing to address the metabolic, regulatory, and endocrine functions of the kidney, leading to high mortality rates and significant economic burden, with a shortage of available kidney transplants and inefficiencies in existing cell propagation methods for renal epithelial cells.
Innovation Solution
The development of enhanced cell propagation methods, including enzymatic digestion, centrifugation, and subculturing techniques, to increase the yield of renal epithelial cells, which can be used in bioartificial renal devices such as the wearable bioartificial kidney, allowing for more efficient production of cells for renal replacement therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional cell propagation methods are used, then the process is simple, but the cell yield is insufficient for clinical applications
Solution Approach 1:
The cell propagation process is divided into distinct stages: initial tissue digestion, primary cell isolation, expansion culture phases, and differentiation induction. Each stage uses optimized conditions (enzyme combinations, serum concentrations, passage intervals) to maximize cell yield at that particular phase, transforming a single complex process into manageable sequential steps that collectively achieve high cell production
Solution Approach 2:
The patent systematically varies critical culture parameters including serum concentration (0-20% FBS), enzyme digestion time and temperature, passage timing, and cell density to identify optimal conditions for each propagation stage. These parameter optimizations enable exponential cell expansion while maintaining cell viability and functionality, resolving the contradiction between yield and process complexity
2Quantity of substance
If cell differentiation is induced early, then functional cells are produced, but the total cell yield decreases
Solution Approach 1:
The patent performs preliminary cell expansion in an undifferentiated state through multiple passage cycles before inducing differentiation. This preliminary proliferation phase accumulates a large pool of precursor cells that can then be differentiated into functional renal cells. The separation of expansion and differentiation phases ensures maximum cell yield while maintaining the ability to produce functional cells when needed
Solution Approach 2:
The propagation protocol employs periodic passage and subculture cycles with specific intervals between transfers. This periodic action maintains cells in a proliferative state during expansion phases, then periodically induces differentiation in controlled batches. The rhythmic cycling between proliferation and differentiation modes optimizes both total yield and functional cell production
3Quantity of substance
If tissue digestion is more aggressive, then more cells are released, but cell viability decreases
Solution Approach 1:
The patent applies partial digestion strategies where tissue is digested to a specific degree (using controlled enzyme concentrations and exposure times) that releases sufficient cells without causing excessive damage. The digestion is stopped at the optimal point where cell release efficiency is maximized while viability remains high, avoiding the extremes of both insufficient and excessive digestion
Solution Approach 2:
Enzymes such as collagenase and dispase are used as intermediary agents to facilitate gentle tissue dissociation. These enzymatic mediators break down extracellular matrix components selectively, releasing cells from tissue structures without the mechanical stress of harsh physical methods. The enzymes act as intermediaries that enable cell release while preserving cell integrity and viability
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
These methods significantly increase the yield of renal epithelial cells, enabling the production of more bioartificial renal devices and potentially improving patient outcomes by providing continuous physiologic renal support and addressing the limitations of current therapies.
Implementation Method 1
The slurry is centrifuged (e.g., at greater than about 50×(g)) to generate a pelleted slurry
Implementation Method 2
The kidney sample is treated to separate the sample into fragments
Data Source
AI summary
The present invention relates generally to methods for the isolation and propagation of cells. For example, embodiments of the present invention relate to isolation and propagation methods for the manufacture of a large number of cells for use, for example, in biotherapeutic devices, such as devices for renal replacement therapy for the treatment of acute renal failure (ARF), acute tubular necrosis (ATN), multi-organ failure (MOF), sepsis, cardiorenal syndrome (CRS) and end-stage renal disease (ESRD).