Summary
A method, using albumin-pyrene complexes, has been developed for labeling, in a controlled manner, crab leg nerves whose excitability was preserved.
The excimer-to-monomer fluorescence intensity ratio of pyrene, embedded in nerve membrane lipids and in their crude lipid extracts, is a fluidity parameter which displayed the following features with temperatures.
a—a temperature-dependent increase of fluidity
b—three breaks (6°, 19° and 37°C) in the physiological medium
c—In Ca ++-depleted sea water, the 37° characteristic temperature vanished.
These breaks may reflect some lateral phase separations of the lipid components of nerve membranes. The calcium dependent temperature break may involve a segregation of acidic phospholipids while the other two breaks (6° and 19°C) may be due to neutral lipids phase separation. The relationship of these findings to nerve function is discussed.
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Georgescauld, D., Desmazes, J.P. & Duclohier, H. Temperature dependence of the fluorescence of pyrene labeled crab nerve membranes. Mol Cell Biochem 27, 147–153 (1979). https://doi.org/10.1007/BF00215363
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DOI: https://doi.org/10.1007/BF00215363