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Fucose expression in skeletal muscle: a lectin histochemical study
S Kirkeby1, D Moe, T C Bøg-Hansen
1Department of Oral Function, Faculty of Health Sciences, University of Copenhagen, Denmark.
The Histochemical Journal
|September 1, 1993
Summary
This study investigated fucose-specific lectin binding in muscle tissues, revealing distinct patterns in normal, denervated, and Duchenne muscular dystrophy (DMD) muscle. Fucose expression changes were observed in disease and denervation states, particularly in sarcolemmal and intracellular locations.
Area of Science:
- Biochemistry
- Histology
- Cell Biology
Background:
- Fucosylated glycoconjugates play roles in cellular processes.
- Lectins are proteins that bind carbohydrates, useful for identifying specific glycans.
- Muscle diseases like Duchenne muscular dystrophy (DMD) involve complex cellular changes.
Purpose of the Study:
- To map the distribution of fucose-specific lectin binding sites in normal, denervated, and DMD human and rat muscles.
- To characterize the nature of fucose expression in different muscle conditions.
- To investigate potential changes in fucose residues associated with muscle pathology and regeneration.
Main Methods:
- Histochemical analysis using three fucose-specific lectins: Aleuria aurantia agglutinin (AAA), Lotus tetragonolobus agglutinin (LTA), and Ulex europeus I agglutinin (UEA I).
- Examination of muscle sections from normal human and rat, DMD patients, and denervated/devascularized rat muscle.
- Application of blocking (fucose addition) and pretreatment (formaldehyde, periodic oxidation) steps to characterize lectin binding specificity.
Main Results:
- AAA detected fucosylated compounds in normal muscle sarcoplasm, sarcolemma, connective tissue, and vasculature.
- LTA strongly labeled muscle capillaries after pretreatment, while UEA I stained only human endothelial cells.
- Denervated muscle showed novel intracellular fucose in necrotic fibers, and DMD muscle exhibited cryptic sarcolemmal fucose expression detected by AAA.
Conclusions:
- Fucose expression in muscle is complex and varies with tissue condition.
- Changes in fucose localization, including cryptic and novel expressions, are associated with muscle denervation and Duchenne muscular dystrophy.
- Fucose-specific lectins are valuable tools for investigating glycan alterations in muscle pathology.