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Updated: Aug 6, 2026
Adenovirus-mediated Genetic Removal of Signaling Molecules in Cultured Primary Mouse Embryonic Fibroblasts
Published on: September 9, 2010
Identification and isolation of embryonic stem cell-derived target cells by adenoviral conditional targeting
Tomoyuki Takahashi1, Takao Kawai, Hiroaki Ushikoshi
1Division of Gene Therapy and Regenerative Medicine, Cognitive and Molecular Research Institute of Brain Diseases, Department of Advanced Therapeutics and Regenerative Medicine, Kurume University, 67 Asahi-machi, Kurume 830-0011, Japan.
Abstract:
The technical limitations of isolating target cells have restricted the utility of pluripotent embryonic stem (ES) cells. For example, early cardiac (i.e., precontractile) cells have not been isolated from ES cells. Here, we find that direct expression of reporter genes under cell-specific promoters-the currently available strategy for isolating cells lacking cell-specific surface markers-is ineffective for isolating progenitor cells. This was due to the weak activity of cell-specific promoters, particularly in ES cells at early stages. We show that adenoviral conditional targeting efficiently isolates viable ES cell-derived target cells without harmful effects. In this strategy, we employ the alpha-myosin heavy chain and Nkx2.5 promoter to visualize and purify efficiently differentiated and primitive cells of the cardiac lineage, respectively. While the former cells predominantly expressed sarcomeric proteins and maintained contractile function, the latter demonstrated neither of these features, but rather exhibited expression patterns characteristic of a mixture of primitive cells and cardiomyocytes. Interestingly, smooth muscle actin was predominantly expressed in the latter cells, and both functionally known and unknown genes were systematically identified, demonstrating the benefits of this system. Thus, our method facilitates molecular and cellular studies of development and ES cell-derived cell therapy.
Insights
Researchers developed a new method to isolate specific cells derived from embryonic stem cells (ES cells). This technique overcomes limitations in isolating early cardiac progenitor cells, advancing stem cell research and therapy.
Area of Science:
- Developmental Biology
- Stem Cell Biology
- Cellular Cardiology
Background:
- Pluripotent embryonic stem cells (ES cells) have vast therapeutic potential but are limited by difficulties in isolating specific cell types.
- Existing methods, like reporter gene expression, are ineffective for isolating progenitor cells due to weak promoter activity in early-stage ES cells.
- Early cardiac cells, crucial for developmental studies, have remained challenging to isolate from ES cell differentiation cultures.
Purpose of the Study:
- To develop an efficient and non-harmful method for isolating viable target cells derived from ES cells.
- To overcome the limitations of current cell isolation strategies for progenitor cells, particularly in cardiac lineage differentiation.
- To facilitate molecular and cellular studies of developmental processes and ES cell-based therapies.
Main Methods:
- Utilized adenoviral conditional targeting for efficient isolation of ES cell-derived target cells.
- Employed the alpha-myosin heavy chain promoter to isolate differentiated cardiac cells and the Nkx2.5 promoter for primitive cardiac progenitor cells.
- Characterized isolated cells based on protein expression (sarcomeric proteins, smooth muscle actin) and functional assessments (contractile function).
Main Results:
- The adenoviral conditional targeting method successfully isolated viable ES cell-derived cardiac cells without adverse effects.
- Differentiated cells expressed sarcomeric proteins and exhibited contractile function, while primitive cells showed mixed expression patterns and smooth muscle actin.
- The system enabled the identification of both known and novel genes, highlighting its utility in comprehensive molecular profiling.
Conclusions:
- Adenoviral conditional targeting provides an effective strategy for isolating specific cell populations from ES cell differentiation.
- This method overcomes previous limitations in isolating early cardiac progenitor cells, enabling detailed developmental and therapeutic studies.
- The developed system significantly advances the potential for molecular analysis and cell-based therapies using ES cell derivatives.
