Nov 1, 1977

Electron microscopy of negatively stained and freeze-etched high density lipoprotein-3 from human serum

Proceedings of the National Academy of Sciences of the United States of America
M OhtsukiA M Scanu

Abstract

High density lipoproteins of d = 1.12 to 1.21 g/ml from human serum (HDL3) were studied by electron microscopy with both negative staining and freeze-etching techniques. For the negatively stained specimens, a modified conventional transmission electron microscope as well as a scanning transmission electron microscope were used. The freeze-etched specimens were examined by a conventional transmission electron microscope. The diameter of HDL3 was found to be 105 +/- 4 A by freeze-etching and 94 +/- 6 A by negative staining. The surface of the HDL3 particles exhibited about 12 discrete domains, 28 +/- 3 A (freeze-etched) and 28 +/- 4 A (negatively stained) in diameter, of undefined chemical composition. Moreover, the freeze-etched specimens revealed an inner core 40 +/- 2 A in diameter, corresponding to estimated values reported previously. All information is consistent with the HDL3 model proposed by B. W. Shen, F. J. Kézdy, and A. M. Scanu [(1977) Proc. Natl. Acad. Sci. USA 74, 837-841], with additional evidence for well-defined surface substructure. The consistency of the images obtained with the various electron microscopy techniques and the marked change in the appearance of the surface in the HDL3 preparations that were dig...Continue Reading

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References

Mentioned in this Paper

PLA2G2A protein, human
Phospholipase A2, human
HDL-Cholesterol Subclass 3 Measurement
Activated T Cell Autonomous Cell Death
Huntington DISEASE-LIKE 3 (Disorder)
PLA2G4C protein, human
High-density Lipoprotein Particle
Digests
HDL3
Electron Microscopy, Diagnostic

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