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Nitric Oxide. 2012 Oct 15;27(3):161-8. doi: 10.1016/j.niox.2012.06.004. Epub 2012 Jun 21.

A system for exposing molecules and cells to biologically relevant and accurately controlled steady-state concentrations of nitric oxide and oxygen.

Author information

1
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

Nitric oxide (NO) plays key roles in cell signaling and physiology, with diverse functions mediated by NO concentrations varying over three orders-of-magnitude. In spite of this critical concentration dependence, current approaches to NO delivery in vitro result in biologically irrelevant and poorly controlled levels, with hyperoxic conditions imposed by ambient air. To solve these problems, we developed a system for controlled delivery of NO and O(2) over large concentration ranges to mimic biological conditions. Here we describe the fabrication, operation and calibration of the delivery system. We then describe applications for delivery of NO and O(2) into cell culture media, with a comparison of experimental results and predictions from mass transfer models that predict the steady-state levels of various NO-derived reactive species. We also determined that components of culture media do not affect the steady-state levels of NO or O(2) in the device. This system provides critical control of NO delivery for in vitro models of NO biology and chemistry.

PMID:
22728703
PMCID:
PMC3424365
DOI:
10.1016/j.niox.2012.06.004
[Indexed for MEDLINE]
Free PMC Article

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