Chemically modiﬁed metal surfaces have been used to recognize and capture speciﬁc cell types and biomolecules. In this work, stainless steel wires were functionalized with aptamers against breast cancer stem cell markers. Stainless steel wires were ﬁrst electropolished and silanized via electrodeposition. Aptamers were then attached to the silanized surface through a cross-linker. The functionalized wires were able to capture the target cells in an in vitro test. During surface modiﬁcation steps, wires were analyzed by atomic force microscopy, cyclic voltammetry, scanning electron and ﬂuorescence microscopy to determine their surface composition and morphology. Optimized conditions of silanization (applied potential, solution pH, heat treatment temperature) for obtaining an aptamer-functionalized wire were determined in this work together with the use of several surface characterization techniques suitable for small-sized and circular wires. These modiﬁed wires have potential applications for the in vivo capture of target cells in blood ﬂow, since their small size allows their insertion as standard guidewires in biomedical devices.
|Publication status||Published - Aug 21 2020|
- stainless steel wire; functionalization; silanization; aptamers; breast cancer stem cells