A molecular delivery system by using AFM and nanoneedle

Biosens Bioelectron. 2005 Apr 15;20(10):2120-5. doi: 10.1016/j.bios.2004.08.023.

Abstract

We developed a new low invasive cell manipulation and gene or molecule transfer system in a single living cell by using an atomic force microscope (AFM) and ultra thin needle, a nanoneedle. DNA was immobilized on the surface of the nanoneedle by covalent bonding and avidin-biotin affinity binding. Immobilization of DNA on the nanoneedle was confirmed by measuring the unbinding force between avidin and biotin. The DNA-immobilized nanoneedle was successfully inserted into HEK293 cells. Though TO-PRO-3 iodide staining experiments using confocal microscopy, we observed the immobilized DNA on the surface of the nanoneedle, which was retained after 10 times insertions to and evacuations from a living cell.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • DNA / administration & dosage*
  • Equipment Design
  • Equipment Failure Analysis
  • Humans
  • Kidney / physiology
  • Kidney / ultrastructure*
  • Microinjections / instrumentation*
  • Microinjections / methods
  • Micromanipulation / instrumentation*
  • Micromanipulation / methods
  • Microscopy, Atomic Force / instrumentation
  • Microscopy, Atomic Force / methods*
  • Nanotechnology / instrumentation*
  • Nanotechnology / methods
  • Needles*
  • Transfection / instrumentation*
  • Transfection / methods

Substances

  • DNA