PMID: 7161148Jan 1, 1982

Localization of apoVLDL-II, a major apoprotein in very low density lipoproteins, in the estrogen-treated cockerel liver by immunoelectron microscopy

Histochemistry
C T Lin, L Chan

Abstract

We have studied the sites of synthesis, assembly, and secretion of apoVLDL-II, a major apoprotein in very low density lipoproteins (VLDL), in the cockerel liver by immunoelectron microscopy. In the liver of the estrogen-treated cockerel, apoVLDL-II reaction products were localized in the cisternae of the nuclear envelope and the rough endoplasmic reticulum (RER). Such products were not observed in the smooth endoplasmic reticulum (SER). ApoVLDL-II reaction products were also located on the surface of lipid particles in the Golgi apparatus and secretory vesicles. Such lipid particles were not detected in the RER or SER. Some secretory vesicles containing the reaction products were seen during the process of fusion with the plasma membrane. Such fusion took place against the plasma membrane lining the space of Disse as well as the intercellular spaces. Reaction products also occurred in the sinusoids. These observations are compatible with the following sequence of events in the synthesis, assembly and secretion of apoproteins in VLDL in the cockerel liver: ApoVLDL-II is synthesized on bound ribosomes attached to the nuclear envelope and RER, and is discharged into their cisternae. The protein is probably transported to the Golgi...Continue Reading

References

Aug 1, 1975·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·C T LinJ P Chen
Oct 31, 1975·Science·C Lin, J Chang
May 1, 1976·The Journal of Cell Biology·C A AlexanderR J Havel
Aug 1, 1976·The Journal of Clinical Investigation·L ChanA R Means
Dec 1, 1974·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·P K Nakane, A Kawaoi
Jan 1, 1969·Journal of Ultrastructure Research·A R Spurr
Jan 1, 1980·Annals of the New York Academy of Sciences·L ChanA R Means
Sep 1, 1955·The Journal of Clinical Investigation·R J HavelJ H BRAGDON

Related Concepts

Apolipoproteins
Endoplasmic Reticulum
Estrogen Effect
Polyglobin
Lipids
Lipoproteins, VLDL1
Liver
Electron Microscopy

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