Extensive evidence supports the notion that the cytoskeleton participates in the immobilization and membrane clustering of the nicotinic acetylcholine receptor (AChR) at the neuromuscular junction. Stimulated emission depletion fluorescence microscopy has revealed the supramolecular organization of AChR nanoclusters at the surface of CHO-K1/A5 cells with subdiffraction resolution (Kellner et al., Neuroscience 144:135–143 2007). We studied the effect of two cytoskeletal-disrupting drugs (cytochalasin D and jasplakinolide) on the nanoscale distribution of muscle-type AChR expressed in these cells by means of mathematical and statistical analysis of images obtained with the same high-resolution microscopy. AChR nanoclusters were found to be randomly distributed in both controls and cells treated with either drug for distances larger than 500 nm. Treatments altered the distribution of AChR nanoclusters according to their brightness/size. Cytochalasin D and jasplakinolide produced a statistically significant increase in the proportion of medium-size nanoclusters and a diminution of small nanoclusters, indicating higher disrupting activity on the latter. This was further corroborated by the diminution of the brightness/diameter ratio of nanoclusters (a measure of the intracluster density of AChR molecules) and by Ripley’s analysis applied to simulated patterns with intracluster aggregation of AChR molecules. The combined analytical tools bring out subtle changes in the two-dimensional organization of the AChR nanoaggregates on disruption of the cytoskeletal network and throw light on the possible link between the cytoskeleton and the distribution of the AChR at the cell surface.
The Journal of Membrane Biology – Springer Journals
Published: Jun 8, 2010
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud