Abstract:
BACKGROUND:The use of Procion orange dye (POD) is one of the most widely accepted techniques to assess sarcolemmal damage. This phenomenon has been related to functional adaptation in skeletal muscles. The POD method includes intravenous injection of this colorant in vivo, enabling its identification inside those fibres with membrane leaks (fluorescence). However, the safety of the use of POD has not been proven. AIM:This study was designed to compare POD with a safer alternative, involving the identification of intracellular fibronectin using specific antibodies. METHOD:Eight Swiss mice were submitted to electrical stimulation of the lower limbs at different frequencies (10-80 Hz). Subsequently, the POD solution was infused, and samples from the vastus medialis muscle were obtained 24 h later. Samples were processed and serial sections were analysed using immunohistochemistry (monoclonal antibodies against fibronectin) and epifluorescence microscopy. RESULTS:Ninety-eight per cent of the fibres were equally classified by both techniques, which in addition showed good correlation (percentages of damaged fibres, r = 0.998, P < 0.001) and concordance (R1 = 0.82) in quantitative terms. CONCLUSIONS:Although the two techniques compared here are based on different principles, both are comparable in assessing sarcolemmal damage. This would facilitate comparisons between human and experimental studies. In addition, the fibronectin technique appears to be a suitable alternative for long-term studies including repeated biopsies.
journal_name
Eur J Clin Investjournal_title
European journal of clinical investigationauthors
Palacio J,Gāldiz JB,Alvarez FJ,Orozco-Levi M,Lloreta J,Gea Jdoi
10.1046/j.1365-2362.2002.01005.xkeywords:
subject
Has Abstractpub_date
2002-06-01 00:00:00pages
443-7issue
6eissn
0014-2972issn
1365-2362pii
1005journal_volume
32pub_type
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