Encapsulated cells: an atomic force microscopy study. 2004

Meng Yu, and Albena Ivanisevic
Department of Biomedical Engineering, Purdue University, 500 Central Drive, West Lafayette, IN 47907, USA.

Two types of cells--human platelets and spore cells--were encapsulated in polymer shells by adsorbing polyanions and polycations in a stepwise fashion. The encapsulated cells were attached to gold and silicon surfaces and their morphological and adhesion properties were studied in air using tapping mode atomic force microscopy (AFM). The roughness of the encapsulated cells increased upon the addition of a new polymer layer. The increase in roughness can be attributed to the formation of a shell around the cells, which is stabilized by electrostatic interactions, as well as to the drying effects associated with the immobilization and dehydration of the cells. Trigger mode was used to perform the force imaging and map out the adhesion characteristics of the cells. Systematic "maps" of the adhesion properties of the encapsulated cells to clean and amine terminated AFM tips were collected. The adhesion force data for the different tips and encapsulated cells showed dependence not only on the number and thickness of the polymer layers, but also on the interactions between these layers. The encapsulated cells' morphology and roughness characteristics remained intact over a substantial storage period. This stability and adhesion properties make them suitable building blocks for the design and construction of biomimetic templates where AFM is used as the primary tool to do the fabrication.

UI MeSH Term Description Entries
D008846 Micromanipulation The performance of dissections, injections, surgery, etc., by the use of micromanipulators (attachments to a microscope) that manipulate tiny instruments. Micromanipulations
D011108 Polymers Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS). Polymer
D001792 Blood Platelets Non-nucleated disk-shaped cells formed in the megakaryocyte and found in the blood of all mammals. They are mainly involved in blood coagulation. Platelets,Thrombocytes,Blood Platelet,Platelet,Platelet, Blood,Platelets, Blood,Thrombocyte
D002448 Cell Adhesion Adherence of cells to surfaces or to other cells. Adhesion, Cell,Adhesions, Cell,Cell Adhesions
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D004548 Elasticity Resistance and recovery from distortion of shape.
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000268 Adhesiveness A property of the surface of an object that makes it stick to another surface. Adhesivenesses
D001412 Bacillus subtilis A species of gram-positive bacteria that is a common soil and water saprophyte. Natto Bacteria,Bacillus subtilis (natto),Bacillus subtilis subsp. natto,Bacillus subtilis var. natto
D013314 Stress, Mechanical A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area. Mechanical Stress,Mechanical Stresses,Stresses, Mechanical

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