Renal Collecting Duct Cell Differentiation With Selective Culture Medium
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Solution Overview
Problem
There is a lack of methods for selectively inducing differentiation of renal collecting duct cells and renal pelvic epithelial cells from human pluripotent stem cells.
Innovation Solution
A method involving culturing ureteric bud cells or cells differentiated from ureteric bud cells in a medium containing a TGFβ inhibitor, a Wnt inhibitor, and a phosphodiesterase inhibitor, and culturing renal collecting duct principal cells in a medium with a TGFβ inhibitor, a Wnt inhibitor, a retinoic acid receptor agonist, and a Notch signal inhibitor, in the presence of an ETS family protein, to produce renal collecting duct principal cells, intercalated cells, or renal pelvic epithelial cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ureteric bud cells are cultured to produce renal collecting duct cells, then renal tissues can be generated, but selective differentiation of specific cell types cannot be achieved
Solution Approach 1:
The patent applies parameter changes by systematically modifying culture medium composition to achieve selective differentiation. Specifically, it uses a TGFβ inhibitor (SB431542) at 3 μM, a Wnt inhibitor (IWR-1) at 1 μM, and a phosphodiesterase inhibitor (IBMX) at 100 μM to induce renal collecting duct principal cells with 90% or higher purity. For intercalated cells, it adjusts parameters by adding a retinoic acid receptor agonist (TTNPB) at 1 μM and a Notch signal inhibitor (DAPT) at 10 μM while maintaining the base inhibitors, achieving 30% or higher purity. This demonstrates parameter changes as the core inventive principle.
2Productivity
If renal progenitor cells are combined for culture to produce renal tissues, then organoid formation occurs, but selective induction of specific cell types remains unachieved
Solution Approach 1:
The patent achieves cell type specificity while maintaining organoid production by changing cultural parameters. For renal collecting duct principal cells, it uses SB431542 (3 μM), IWR-1 (1 μM), and IBMX (100 μM). For intercalated cells, it modifies the medium to include TTNPB (1 μM) and DAPT (10 μM) in addition to the base inhibitors. These parameter changes enable selective induction of specific cell types from ureteric bud organoids while maintaining productivity.
Data Source
AI summary
Provided is a method for producing renal collecting duct principal cells, including culturing ureteric bud cells or cells that have been differentiated from ureteric bud cells in a medium comprising a TGFβ inhibitor, a Wnt inhibitor, and a phosphodiesterase inhibitor. Also, provided is a method for producing a renal collecting duct principal cell-containing organoid, including culturing a ureteric bud organoid or an organoid that has been differentiated from a ureteric bud organoid in a medium comprising a TGFβ inhibitor, a Wnt inhibitor, and a phosphodiesterase inhibitor.