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Histochemistry and Cell Biology

, Volume 138, Issue 4, pp 617–626 | Cite as

Immunofluorescent visualisation of focal adhesion kinase in human skeletal muscle and its associated microvasculature

  • Oliver J. Wilson
  • Christopher S. Shaw
  • Mark Sherlock
  • Paul M. Stewart
  • Anton J. M. WagenmakersEmail author
Original Paper

Abstract

Within animal skeletal muscle, focal adhesion kinase (FAK) has been associated with load-dependent molecular and metabolic adaptation including the regulation of insulin sensitivity. This study aimed to generate the first visual images of the localisation of FAK within human skeletal muscle fibres and its associated microvasculature using widefield and confocal immunofluorescence microscopy. Percutaneous muscle biopsies, taken from five lean, active males, were frozen and 5-μm cryosections were incubated with FAK antibodies for visualisation in muscle fibres and the microvasculature. Anti-myosin heavy chain type I was used for fibre-type differentiation. Muscle sections were also incubated with anti-dihydropyridine receptor (DHPR) to investigate co-localisation of FAK with the t-tubules. FITC-conjugated Ulex europaeus Agglutinin I stained the endothelium of the capillaries, whilst anti-smooth muscle actin stained the vascular smooth muscle of arterioles. Fibre-type differences in the intensity of FAK immunofluorescence were determined with image analysis software. In transversely and longitudinally orientated fibres, FAK was localised at the sarcolemmal regions. In longitudinally orientated fibres, FAK staining also showed uniform striations across the fibre and co-staining with DHPR suggests FAK associates with the t-tubules. There was no fibre-type difference in sarcoplasmic FAK content. Within the capillary endothelium and arteriolar smooth muscle, FAK was distributed heterogeneously as clusters. This is the first study to visualise FAK in human skeletal muscle microvasculature and within the (sub)sarcolemmal and t-tubule regions using immunofluorescence microscopy. This technique will be an important tool for investigating the role of FAK in the intracellular signalling of human skeletal muscle and the endothelium of its associated microvasculature.

Keywords

Focal adhesion kinase Skeletal muscle Fluorescence Confocal imaging 

Notes

Acknowledgments

The antibodies against human slow myosin (A4.840-c) used in the study were developed by Dr. Blau and were obtained from the Developmental Studies Hybridoma Bank developed under the auspices of the NICHD and maintained by The University of Iowa, Department of Biological Sciences, Iowa City, IA 52242. OJW is funded by a BBSRC targeted priority studentship into ageing.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Oliver J. Wilson
    • 1
  • Christopher S. Shaw
    • 1
  • Mark Sherlock
    • 2
  • Paul M. Stewart
    • 2
  • Anton J. M. Wagenmakers
    • 1
    Email author
  1. 1.Exercise Metabolism Research Group, School of Sport and Exercise SciencesThe University of BirminghamBirminghamUK
  2. 2.Centre for Endocrinology, Diabetes and Metabolism, School of Clinical and Experimental MedicineThe University of BirminghamBirminghamUK

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