title: On-column labeling for capillary electrophoretic analysis of individual mitochondria directly sampled from tissue cross sections.
abstract: This technical note reports on a new procedure to on-column-label organelles sampled from a tissue cross section into a fused silica capillary. These organelles are then analyzed by capillary electrophoresis with postcolumn laser-induced fluorescence detection. In this procedure, the fluorescent label does not come in contact with the tissue, which facilitates visualization of the sampled tissue cross section. In addition, on-column labeling allows for better control of the reaction time and fluorescent label concentrations. As a proof-of-principle, we show results of mitochondria from rat gastrocnemius muscle cross sections that were on-column-labeled with 10-N-nonyl acridine orange (NAO), a mitochondrion-specific probe, and compare them with results for NAO in-tissue labeling of the same tissue. The new organelle labeling procedure reported here may easily be extended to the analysis of individual organelles in other biological samples and may become a valuable tool in studies investigating the role of mitochondria in muscle aging and exercise physiology.
authors.affiliation: Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
authors.forename: Hossein
authors.initials: H
authors.lastname: Ahmadzadeh
authors.forename: LaDora V
authors.initials: LV
authors.lastname: Thompson
authors.forename: Edgar A
authors.initials: EA
authors.lastname: Arriaga
mesh_terms: D019412:Anatomy, Cross-Sectional; D000818:Animals; D019075:Electrophoresis, Capillary / Q000379:methods*; D008928:Mitochondria / Q000378:metabolism*; D009132:Muscles; D051381:Rats