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Structural adaptation of the nuclear pore complex in stem cell-derived cardiomyocytes
Carmen Perez-Terzic1, Atta Behfar, Annabelle Méry
1Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Mayo Foundation, Rochester, Minn, USA.
Circulation Research
|February 26, 2003
Summary
During cell differentiation, stem cells adapt their nuclear pores to regulate molecular transport, ensuring proper gene expression for cardiac lineage commitment. This study reveals key changes in nuclear pore structure and transport factors.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Biology
Background:
- Nuclear pores regulate nucleocytoplasmic transport, crucial for cellular function.
- Understanding nuclear transport during stem cell differentiation is limited.
Purpose of the Study:
- Investigate nuclear pore complex (NPC) adaptations during stem cell differentiation into cardiomyocytes.
- Characterize changes in nucleocytoplasmic transport mechanisms supporting cardiac lineage commitment.
Main Methods:
- Differentiated murine embryonic stem cells into cardiomyocytes.
- Analyzed nuclear pore density and structure using nanoscale resolution.
- Assessed expression of nucleoporins and distribution of nuclear transport factor Ran.
Main Results:
- Stem cell-derived cardiomyocytes showed reduced NPC density compared to adult cardiac cells.
- NPCs in differentiating cells exhibited a protruding central transporter.
- Differentiating cells altered Ran distribution and expressed specific nucleoporins (NUP214, NUP358, NUP153, p62).
Conclusions:
- Differentiating cardiomyocytes undergo structural NPC modifications.
- Mobilization of nuclear transport regulators supports nucleocytoplasmic communication.
- These adaptations facilitate lineage commitment and development of mature cardiac cells.