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find Author "CAI Kaiyong" 1 results
  • PRELIMINARY STUDY ON INTERACTIONS BETWEEN ENDOTHELIAL CELLS AND DOMAINS WITH DIFFERENT PROTEIN CONCENTRATIONS ON THE SAME SUBSTRATE

    Objective To investigate the biological response and chemotaxis of endothel ial cells on template materials with different protein concentrations on the same surface, to provide the evidence for deep understanding of chemical induced cell motil ity. Methods Microcontact printing technique was employed to fabricate template materials with four different concentrations of collagen (50, 100, 200, 300 μg/mL) on the same substrate. Scanning electron microscopy was employed to characterize the qual ity of polydimethylsiloxane (PDMS) stamp. Confocal laser scanning microscopy (CLSM) was util ized to characterize the absorption of different concentrations of FITC conjugated collagen (50, 100, 200, 300 μg/mL) on the substrates surfaces. Software was used to analyze the fluorescence intensity of adsorbed protein on the substrates. Albumin was then used to block the substrates for cell culture of human umbil ical vein endothel ial cells (hUVEC). Substrates with no collagen adsorption were used as control samples. The influence of different concentrations of collagen on the prol iferation of hUVEC was investigated via MTT assay at 6, 24, 48 and 72 hours of culture. The cytoskeletal structures of cells were characterized by CLSM. The cell’ s migration speed and absolute displacement were measured by path measurement of single cell after 24 hours of culture. Results Fabricated PDMS stamps with complete pattern were flat. Template substrates were fully covered with evenly distributed collagen protein. The fluorescence intensities were 38.51 ± 1.63, 55.21 ± 3.88, 73.17 ± 3.59, and 80.95 ± 1.12 in adsorbed FTIC conjugated collagen with 50, 100, 200 and 300 μg/mL, respectively. Endothel ial cells spread better on various substrates coated with collagen than those of control samples. The prol iferation of endothel ial cells on collagen coated substrateswas significantly higher than that of control group (P lt; 0.05). With collagen concentration increasing from 50 µg/mL to 300µg/mL, the prol iferation abil ities and absolute displacements of endothel ial cells significantly increased (P lt; 0.05). Except for the group with 300 μg/mL, the migration speed of endothel ial cells on collagen coated substrates was significantly lower (P lt; 0.05) than that of control group. However, the migration speed of endothel ial cells on collagen coated substrates significantly increased (P lt; 0.05) along with collagen concentration increasing from 50 µg/mL to 300 µg/mL. Conclusion It is feasible to acquire domains with different protein concentrations on the same substrate using microcontact printing technique for investigating cell’s chemotaxis.

    Release date:2016-09-01 09:06 Export PDF Favorites Scan
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