Multilineage potential of side population cells from human amnion mesenchymal layer

Area of Science:

• Stem Cell Biology
• Regenerative Medicine
• Immunology

Background:

• Human amnion mesenchymal cells (AMCs) are a source of stem cells.
• Side population (SP) cells possess unique characteristics.
• Understanding AMC-derived SP cell properties is crucial for therapeutic applications.

Purpose of the Study:

• To isolate and characterize side population (SP) cells from human amnion mesenchymal cell (AMC) layers.
• To investigate the immunological profile and multilineage differentiation potential of AMC-derived SP cells.
• To evaluate the suitability of AMC-SP cells for regenerative medicine.

Main Methods:

• Isolation of SP cells from AMC layers using Fluorescence-Activated Cell Sorting (FACS).
• Characterization of AMC-SP cells via immunocytostaining, RT-PCR, and flow cytometry for specific markers (e.g., HLA, Oct-4, Sox-2, CK19, CD markers).
• Assessment of differentiation potential into neuroectodermal, osteogenic, chondrogenic, and adipogenic lineages.

Main Results:

• AMC-SP cells were obtained at a yield of 0.1-0.2% and exhibited robust growth.
• Immunological profiling revealed two distinct cell types: HLA I(-)/II(-) and HLA I+/II(-).
• AMC-SP cells expressed stem cell markers (Oct-4, Sox-2, Rex-1) and lineage markers (vimentin, CK19, nestin), with high expression of CD13, CD29, CD44, and others.
• These cells successfully differentiated into multiple lineages, including neuroectodermal, osteogenic, chondrogenic, and adipogenic cells.

Conclusions:

• AMC-SP cells possess multilineage potential and unique immunological characteristics (HLA I(-)/II(-) or HLA I+/II(-)).
• Their ability to differentiate and their immune profile suggest they are suitable for regenerative medicine.
• AMC-SP cells offer advantages for allotransplantation due to low rejection risk, absence of ethical concerns, and unlimited supply.