A new immunosensor for breast cancer cell detection using antibody-coated long alkylsilane self-assembled monolayers in a parallel plate flow chamber.

Abstract	We designed a new efficient and reliable immunosensor and demonstrated its analytic performance to capture breast cancer MCF7 and T47D cells, under laminar flow, onto antibody-coated long alkylsilane self-assembled monolayers (SAMs) in a parallel plate flow chamber. The surface floor of the laminar flow chamber was grafted with an amino-terminated long alkyl chain spacer, 21-aminohenicosyl trichlorosilane (AHTS) followed by tethering a specific monoclonal antibody directed against the human epithelial cell adhesion molecule (EpCAM) antigen, which is overexpressed in primary breast cancer. Properties of the AHTS- and antibody-grafted surface floor were compared to that of surface floors coated with the short alkyl spacers 3-glycidoxy-propyl trimethoxysilane (GPTS) or 3-aminopropyl triethoxysilane (APTES) and antibodies. A theoretical model was constructed according to the geometry of the flow chamber in order to calculate the trajectories that would use cell flows. Cell capture experiments demonstrated that cell immobilization was optimized throughout the whole flow chamber. High cell capture was yielded on antibody-tethered long alkyl AHTS surface. This new procedure offers multiple advantages: a versatile tool readily applied to a panel of purified antibodies, an enrichment of cell immobilization using repetitive cell flow, and a stable capturing surface suitable for long term storage and handling.
Authors	Jean-Claude Ehrhart, Bernard Bennetau, Louis Renaud, Jean-Pierre Madrange, Laurent Thomas, Julie Morisot, Arnaud Brosseau, Sylvain Allano, Patrick Tauc, Phuong-Lan Tran
Journal	Biosensors & bioelectronics (Biosens Bioelectron) Vol. 24 Issue 3 Pg. 467-74 (Nov 15 2008) ISSN: 1873-4235 [Electronic] England
PMID	18547800 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Antibodies, Monoclonal Antigens, Neoplasm Cell Adhesion Molecules Silanes
Topics	Antibodies, Monoclonal (immunology) Antigen-Antibody Reactions Antigens, Neoplasm (immunology) Biosensing Techniques (methods) Breast Neoplasms (diagnosis, immunology, pathology) Cell Adhesion Molecules (immunology) Cell Line, Tumor Female Humans Silanes (chemistry)

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