Islet Cell Cluster Culture via Mesenchymal Stem Cell Mediation
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Solution Overview
Problem
Current methods for culturing islet-like cell clusters (ICCs) are inefficient, leading to cell denaturation and death within 3 to 5 days, making it difficult to obtain sufficient ICCs for transplantation in type I diabetes treatment, as existing culture methods fail to maintain cell survival and function over extended periods.
Innovation Solution
A co-culture method using human mesenchymal stem cells (HUMSCs) or a stem cell conditioned medium, which includes active components like IL-6, TIMP-1, and HGF, to support the survival and function of target animal cells, including ICCs, by promoting their proliferation and maintaining insulin secretion capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If common ex vivo culture method is used for ICCs, then ICCs can be cultured for 3 to 5 days, but ICCs will be denatured, dead, and unable to be utilized after this period
Solution Approach 1:
The patent introduces a specialized culture medium containing insulin, transferrin, and selenium as intermediary substances that mediate between the ICCs and the culture environment. This tri-insulin-transferrin-selenium culture medium acts as a mediator to protect ICCs from denaturation and death, extending their survival from 3-5 days to over 2 weeks while maintaining cell function and integrity
Solution Approach 2:
The patent changes the chemical parameters of the culture medium by specifically adding insulin, transferrin, and selenium compounds. This parameter modification transforms the culture environment from one that causes cell death within 3-5 days to one that sustains ICC viability and function for extended periods, directly resolving the contradiction between culture duration and cell survival
2Reliability
If ICCs are separated and purified for transplantation, then transplantable ICCs can be obtained, but ICCs are lost during the separation and purification process, making it difficult to get enough mass purified ICCs
Solution Approach 1:
The specialized culture medium serves as an intermediary that protects ICCs during the separation and purification processes. By maintaining cell viability and integrity throughout these procedures, more ICCs survive the purification process, increasing the quantity of transplantable purified ICCs obtained
Solution Approach 2:
The patent establishes continuous culture conditions that maintain ICC viability throughout the entire process from separation to purification to transplantation preparation. This continuous protective action prevents cell loss and ensures that the full quantity of purified ICCs remains viable for transplantation
3Quantity of substance
If sufficient ICCs are needed for transplantation, then more ICCs must be produced, but current culture methods cannot maintain cell survival and function over extended periods required for mass production
Solution Approach 1:
By changing the cultural parameters to include insulin, transferrin, and selenium in specific concentrations, the patent extends the productive culture duration from 3-5 days to over 2 weeks. This parameter modification enables mass production of ICCs while maintaining cell survival and function throughout the extended culture period
Solution Approach 2:
The specialized culture medium provides continuous protective action that maintains ICC viability and function throughout the extended culture period required for mass production. This continuous support enables sustained cell proliferation and survival, allowing sufficient quantities of functional ICCs to be produced for transplantation
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 co-culture method with HUMSCs or the stem cell conditioned medium extends the survival and functional integrity of ICCs for several weeks, allowing for continuous insulin secretion and potential transplantation, thereby addressing the limitations of existing culture methods.
Implementation Method 1
the stem cell conditioned medium is composed of basic culture medium and a active component... one or more active components are selected from the group consisting of interleukin-6 (IL-6), tissue inhibitor of metalloproteinase-1 (TIMP-1), tissue inhibitor of metalloproteinase-2 (TIMP-2), monocyte chemoattractant protein-1 (MCP-1), growth related oncogene (GRO), hepatocyte growth factor (HGF)...
Data Source
AI summary
The invention relates to a cell culture method, particularly to a co-culture method for human mesenchymal stem cells and target animal cells, in order to solve the problem that animal cells are not easy to survive alone upon culturing. The invention also provides a method for using a stem cell conditioned medium to culture animal cells. The invention also provides a method to induce the transformation of human fetal islet-like cell clusters from human stem cells and its application thereof.