| Title | Adhesion of human leukocytes to biomaterials: An in vitro study using alkanethiolate monolayers with different chemically functionalized surfaces |
| Publication Type | Journal Article |
| 2003 |
| Authors | Barbosa, JN, Barbosa, MA, Água, AP |
| Journal | Journal of Biomedical Materials Research - Part AJ. Biomed. Mater. Res. Part A |
| Volume | 65 |
| Issue | 4 |
| Pagination | 429 - 434 |
| Date Published | 2003/// |
| 00219304 (ISSN) |
| alkane derivative, article, Biocompatible Materials, biomaterial, Biomaterials, Blood, carboxyl group, cell adhesion, cell interaction, cell isolation, cell subpopulation, cell surface, Cell-surface interactions, Cells, Centrifugation, controlled study, drug effect, Giemsa stain, gold, human, human cell, Humans, hydrophobicity, hydroxide, in vitro study, Incubation, lectin, Lectins, leukocyte, Leukocyte activation, leukocyte adherence, Leukocyte adhesion, Leukocytes, Leukocytes, Mononuclear, materials testing, methane, microscopy, Monolayers, mononuclear cell, neutrophil, Neutrophils, Optical microscopy, phorbol 12 acetate 13 myristate, phorbol 13 acetate 12 myristate, physiology, phytohemagglutinin, Phytohemagglutinins, polymorphonuclear cell, Self-assembled monolayers, Surface Properties, surface property, Tetradecanoylphorbol Acetate, thiolacid |
| The adhesion of human leukocytes to self-assembled monolayers of well-defined surface chemistry was investigated in vitro. Polymorphonuclear (PMN) and mononuclear leukocytes were isolated from human blood by centrifugation techniques. The effect on adhesion of cell activation produced by pre-incubation of leukocytes with phytohemagglutinin (PHA) and phorbol 12-myristate 13-acetate (PMA) was also studied. Gold substrates were modified by treatment with alkanethiols with three different terminal chemical groups: COOH, OH, and CH 3. After incubation with the two subpopulations of leukocytes, the monolayers were washed, treated with fixative, stained with a Giemsa method, and observed by light microscopy to quantify the number of attached leukocytes. Comparative quantification of the density of leukocyte adhesion to the three types of self-assembled monolayers was determined. The hydrophobic surface expressing CH
3 was found to be the one that induced the highest adhesion density of leukocytes, both of PMN and mononuclear cells. In vitro activation of both mononuclear and PMN leukocytes further increased cell adhesion to the chemically defined monolayers that were used. This enhancement was higher for PHA-activated than for PMA-stimulated mononuclear cells, whereas PMA treatment of neutrophils resulted in a higher rate of adhesion of these cells than PHA stimulation. © 2003 Wiley Periodicals, Inc.
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