Effects of ethanol on hepatic protein trafficking

Impairment of receptor-mediated endocytosis

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Ethanol administration disorders protein trafficking in the liver. The protein secretory and plasma membrane assembly pathways have been shown to be impaired in the liver of ethanol-treated animals; however, traffic along the receptor-mediated endocytosis pathway appears to be especially susceptible to alterations by ethanol. Using asialoglycoproteins as model ligands for studying receptor-mediated endocytosis, we have identified at least three steps of this multi-step pathway that are affected by ethanol treatment. These altered steps are recycling of the receptor, internalization of the receptor-ligand complex and dissociation of the ligand from its receptor in endosomes. Ethanol-induced derangements of endocytosis are more severe in the perivenule region, where alcoholic liver injury starts and predominates, than in the periportal region of the liver. In addition, recent studies have shown that the endocytosis of other ligands, including epidermal growth factor and insulin, are also altered by ethanol treatment. Mechanisms which have been proposed to explain faulty endocytosis include: acetaldehyde adducts to tubulin resulting in impaired microtubule function, improper acidification of endosomes and defective receptor clustering in coated pits. Since receptor-mediated endocytosis by the liver represents an important process by which levels of various hormones, growth factors and other ligands are regulated, and since endocytosis may also be an integral process by which the biological effects of various ligands are elicited, changes in this important process could disrupt numerous metabolic and homeostatic events in the liver and total organism.

Original languageEnglish (US)
Pages (from-to)117-125
Number of pages9
JournalAlcohol and Alcoholism
Volume25
Issue number2-3
DOIs
StatePublished - Jan 1 1990

Fingerprint

Protein Transport
Endocytosis
Liver
Ethanol
Ligands
Proteins
Endosomes
Asialoglycoproteins
Acetaldehyde
Acidification
Biological Phenomena
Hormones
Cell membranes
Tubulin
Epidermal Growth Factor
Recycling
Intercellular Signaling Peptides and Proteins
Microtubules
Animals
Cluster Analysis

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Toxicology
  • Psychiatry and Mental health

Cite this

Effects of ethanol on hepatic protein trafficking : Impairment of receptor-mediated endocytosis. / Tuma, D. J.; Casey, Carol A; Sorrell, Michael Floyd.

In: Alcohol and Alcoholism, Vol. 25, No. 2-3, 01.01.1990, p. 117-125.

Research output: Contribution to journalArticle

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