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Growth factors and their receptors derived from human amniotic cells in vitro
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Abstract
In vitro studies have shown that amnion-produced growth factors participated in angiogenesis, re-epithelialization, and immunomodulation. The aim of our study was to investigate the growth factors and receptors produced by human amnion tissue and amniotic cells. Human amnions (hAM) were isolated, and amnion circles were dissected for in vitro analysis. Some amnion fragments were digested by the use of different methods to obtain two cell fractions, which were analysed for mesenchymal and epithelial cell markers. Amniotic circles and human amniotic cell fractions were cultured in a protein-free medium. Proteins secreted into the culture medium were analysed with a human growth factor antibody array. Conditioned culture media were added to human umbilical vein epithelial cells (HUVECs) to test for stimulation of migration (scratch test) and proliferation (Ki67 expression). Fraction 1 cells expressed both cytokeratin and mesenchymal cell markers which indicated that it was composed of a mixture of human amnion epithelial cells (hAECs) and mesenchymal stromal cells (hAMSCs). Fraction 2 cells mainly expressed cytokeratin and, therefore, were designed as hAECs. Secretion of proteins by the cultured cells increased with time. The hAM cultures secreted EGF-R, IGF, and IGFBP-2,-3 and -6; Cell Fraction 1 secreted NT-4, whereas Cell Fraction 2 secreted G-CSF, M-CSF, and PDGF. Conditioned media of hAM cultures stimulated HUVECs migration. We have showed for the first time that human amnions and amniotic cells secreted IGFBP-6, MCSF-R, PDGF-AB, FGF-6, IGFBP-4, NT-4, and VEGF-R3. We found that Cell Fraction 1, Cell Fraction 2, and the whole amnion secreted different proteins, possibly due to different proportions of amnion-derived cells and different cell-cell interactions. The hAM cell factors remained functional in vitro and induced intensified migration of HUVECs. The growth factors and receptors found in amnion or amniotic cell media might be used for regenerative medicine.
Abstract
In vitro studies have shown that amnion-produced growth factors participated in angiogenesis, re-epithelialization, and immunomodulation. The aim of our study was to investigate the growth factors and receptors produced by human amnion tissue and amniotic cells. Human amnions (hAM) were isolated, and amnion circles were dissected for in vitro analysis. Some amnion fragments were digested by the use of different methods to obtain two cell fractions, which were analysed for mesenchymal and epithelial cell markers. Amniotic circles and human amniotic cell fractions were cultured in a protein-free medium. Proteins secreted into the culture medium were analysed with a human growth factor antibody array. Conditioned culture media were added to human umbilical vein epithelial cells (HUVECs) to test for stimulation of migration (scratch test) and proliferation (Ki67 expression). Fraction 1 cells expressed both cytokeratin and mesenchymal cell markers which indicated that it was composed of a mixture of human amnion epithelial cells (hAECs) and mesenchymal stromal cells (hAMSCs). Fraction 2 cells mainly expressed cytokeratin and, therefore, were designed as hAECs. Secretion of proteins by the cultured cells increased with time. The hAM cultures secreted EGF-R, IGF, and IGFBP-2,-3 and -6; Cell Fraction 1 secreted NT-4, whereas Cell Fraction 2 secreted G-CSF, M-CSF, and PDGF. Conditioned media of hAM cultures stimulated HUVECs migration. We have showed for the first time that human amnions and amniotic cells secreted IGFBP-6, MCSF-R, PDGF-AB, FGF-6, IGFBP-4, NT-4, and VEGF-R3. We found that Cell Fraction 1, Cell Fraction 2, and the whole amnion secreted different proteins, possibly due to different proportions of amnion-derived cells and different cell-cell interactions. The hAM cell factors remained functional in vitro and induced intensified migration of HUVECs. The growth factors and receptors found in amnion or amniotic cell media might be used for regenerative medicine.
Keywords
human amnion; amniotic epithelial cells; amniotic mesenchymal stromal cells; cell culture; growth factors
Title
Growth factors and their receptors derived from human amniotic cells in vitro
Journal
Folia Histochemica et Cytobiologica
Issue
Article type
Original paper
Pages
163-170
Published online
2014-10-10
Page views
3518
Article views/downloads
3388
DOI
10.5603/FHC.2014.0019
Bibliographic record
Folia Histochem Cytobiol 2014;52(3):163-170.
Keywords
human amnion
amniotic epithelial cells
amniotic mesenchymal stromal cells
cell culture
growth factors
Authors
Zofia Grzywocz
Ewa Pius-Sadowska
Patrycja Klos
Marek Gryzik
Danuta Wasilewska
Barbara Aleksandrowicz
Malgorzata Dworczynska
Stanislawa Sabalinska
Grazyna Hoser
Boguslaw Machalinski
Jerzy Kawiak