Ethanol-induced apoptosis in polarized hepatic cells possibly through regulation of the Fas pathway

Benita L McVicker, Dean J. Tuma, Jacy L. Kubik, Pamela L. Tuma, Carol A Casey

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Background: It has been noted that alcohol-related liver diseases can be associated with an increase in apoptotic hepatocellular death. Moreover, the promotion of hepatocyte apoptosis may be linked to signals emanating from death receptors, particularly Fas [CD95/apoptosis-inducing protein 1 (APO-1)]. In the present study, we utilized an in vitro hepatic culture model [hybrid of human fibroblast (WI 38) and rat hepatoma (Fao) cells, WIF-B cells] to study potential contributing mechanisms involved in hepatocellular apoptosis following ethanol administration. Methods: WIF-B cultures (differentiated hepatic cells that efficiently metabolize alcohol) were treated with or without ethanol and specific inhibitors of alcohol metabolism and cysteine protease activity, followed by morphological and biochemical examination of proapoptotic parameters. Results: The results of this work demonstrated that ethanol administration leads to an increase (45%-60%) in caspase-3 activity and that the induction of apoptosis was found to be linked to the metabolism of alcohol. Additionally, increases were observed in the activity of upstream initiator caspases (caspase-2 and caspase-8) that are directly related to membrane signaling events of death receptors such as Fas. Moreover, it was determined that the activation of caspase-3 could be blocked by the presence of a specific caspase-8 inhibitor, again linking death receptor-associated proteases to downstream effector caspase activity in alcohol-related death. Finally, ethanol administration was found to result in an increase in the amount of Fas protein present in the membrane fraction of the cell. The increase in membrane Fas protein indicates ligand-independent membrane targeting of Fas in the alcohol-treated cells that could potentially be a key signaling event in the induction of the proapoptotic caspase cascade. Conclusions: The data presented here indicate that alcohol metabolism induces apoptosis in WIF-B cells that occurs, in part, by mechanisms involving signals emanating from death receptors.

Original languageEnglish (US)
Pages (from-to)1906-1915
Number of pages10
JournalAlcoholism: Clinical and Experimental Research
Volume30
Issue number11
DOIs
StatePublished - Nov 1 2006

Fingerprint

Hepatocytes
Ethanol
Alcohols
Death Domain Receptors
Apoptosis
Metabolism
Membranes
Caspase 8
Cells
Caspase 3
B-Lymphocytes
Initiator Caspases
Effector Caspases
Caspase 2
Apoptosis Regulatory Proteins
Caspase Inhibitors
Cysteine Proteases
Fibroblasts
Caspases
Cell culture

Keywords

  • Apoptosis
  • Caspase
  • Ethanol
  • Fas
  • WIF-B Cells

ASJC Scopus subject areas

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

Cite this

Ethanol-induced apoptosis in polarized hepatic cells possibly through regulation of the Fas pathway. / McVicker, Benita L; Tuma, Dean J.; Kubik, Jacy L.; Tuma, Pamela L.; Casey, Carol A.

In: Alcoholism: Clinical and Experimental Research, Vol. 30, No. 11, 01.11.2006, p. 1906-1915.

Research output: Contribution to journalArticle

@article{bd8b3abb0c8d49adb1fd5d1f78e11c26,
title = "Ethanol-induced apoptosis in polarized hepatic cells possibly through regulation of the Fas pathway",
abstract = "Background: It has been noted that alcohol-related liver diseases can be associated with an increase in apoptotic hepatocellular death. Moreover, the promotion of hepatocyte apoptosis may be linked to signals emanating from death receptors, particularly Fas [CD95/apoptosis-inducing protein 1 (APO-1)]. In the present study, we utilized an in vitro hepatic culture model [hybrid of human fibroblast (WI 38) and rat hepatoma (Fao) cells, WIF-B cells] to study potential contributing mechanisms involved in hepatocellular apoptosis following ethanol administration. Methods: WIF-B cultures (differentiated hepatic cells that efficiently metabolize alcohol) were treated with or without ethanol and specific inhibitors of alcohol metabolism and cysteine protease activity, followed by morphological and biochemical examination of proapoptotic parameters. Results: The results of this work demonstrated that ethanol administration leads to an increase (45{\%}-60{\%}) in caspase-3 activity and that the induction of apoptosis was found to be linked to the metabolism of alcohol. Additionally, increases were observed in the activity of upstream initiator caspases (caspase-2 and caspase-8) that are directly related to membrane signaling events of death receptors such as Fas. Moreover, it was determined that the activation of caspase-3 could be blocked by the presence of a specific caspase-8 inhibitor, again linking death receptor-associated proteases to downstream effector caspase activity in alcohol-related death. Finally, ethanol administration was found to result in an increase in the amount of Fas protein present in the membrane fraction of the cell. The increase in membrane Fas protein indicates ligand-independent membrane targeting of Fas in the alcohol-treated cells that could potentially be a key signaling event in the induction of the proapoptotic caspase cascade. Conclusions: The data presented here indicate that alcohol metabolism induces apoptosis in WIF-B cells that occurs, in part, by mechanisms involving signals emanating from death receptors.",
keywords = "Apoptosis, Caspase, Ethanol, Fas, WIF-B Cells",
author = "McVicker, {Benita L} and Tuma, {Dean J.} and Kubik, {Jacy L.} and Tuma, {Pamela L.} and Casey, {Carol A}",
year = "2006",
month = "11",
day = "1",
doi = "10.1111/j.1530-0277.2006.00235.x",
language = "English (US)",
volume = "30",
pages = "1906--1915",
journal = "Alcoholism: Clinical and Experimental Research",
issn = "0145-6008",
publisher = "Wiley-Blackwell",
number = "11",

}

TY - JOUR

T1 - Ethanol-induced apoptosis in polarized hepatic cells possibly through regulation of the Fas pathway

AU - McVicker, Benita L

AU - Tuma, Dean J.

AU - Kubik, Jacy L.

AU - Tuma, Pamela L.

AU - Casey, Carol A

PY - 2006/11/1

Y1 - 2006/11/1

N2 - Background: It has been noted that alcohol-related liver diseases can be associated with an increase in apoptotic hepatocellular death. Moreover, the promotion of hepatocyte apoptosis may be linked to signals emanating from death receptors, particularly Fas [CD95/apoptosis-inducing protein 1 (APO-1)]. In the present study, we utilized an in vitro hepatic culture model [hybrid of human fibroblast (WI 38) and rat hepatoma (Fao) cells, WIF-B cells] to study potential contributing mechanisms involved in hepatocellular apoptosis following ethanol administration. Methods: WIF-B cultures (differentiated hepatic cells that efficiently metabolize alcohol) were treated with or without ethanol and specific inhibitors of alcohol metabolism and cysteine protease activity, followed by morphological and biochemical examination of proapoptotic parameters. Results: The results of this work demonstrated that ethanol administration leads to an increase (45%-60%) in caspase-3 activity and that the induction of apoptosis was found to be linked to the metabolism of alcohol. Additionally, increases were observed in the activity of upstream initiator caspases (caspase-2 and caspase-8) that are directly related to membrane signaling events of death receptors such as Fas. Moreover, it was determined that the activation of caspase-3 could be blocked by the presence of a specific caspase-8 inhibitor, again linking death receptor-associated proteases to downstream effector caspase activity in alcohol-related death. Finally, ethanol administration was found to result in an increase in the amount of Fas protein present in the membrane fraction of the cell. The increase in membrane Fas protein indicates ligand-independent membrane targeting of Fas in the alcohol-treated cells that could potentially be a key signaling event in the induction of the proapoptotic caspase cascade. Conclusions: The data presented here indicate that alcohol metabolism induces apoptosis in WIF-B cells that occurs, in part, by mechanisms involving signals emanating from death receptors.

AB - Background: It has been noted that alcohol-related liver diseases can be associated with an increase in apoptotic hepatocellular death. Moreover, the promotion of hepatocyte apoptosis may be linked to signals emanating from death receptors, particularly Fas [CD95/apoptosis-inducing protein 1 (APO-1)]. In the present study, we utilized an in vitro hepatic culture model [hybrid of human fibroblast (WI 38) and rat hepatoma (Fao) cells, WIF-B cells] to study potential contributing mechanisms involved in hepatocellular apoptosis following ethanol administration. Methods: WIF-B cultures (differentiated hepatic cells that efficiently metabolize alcohol) were treated with or without ethanol and specific inhibitors of alcohol metabolism and cysteine protease activity, followed by morphological and biochemical examination of proapoptotic parameters. Results: The results of this work demonstrated that ethanol administration leads to an increase (45%-60%) in caspase-3 activity and that the induction of apoptosis was found to be linked to the metabolism of alcohol. Additionally, increases were observed in the activity of upstream initiator caspases (caspase-2 and caspase-8) that are directly related to membrane signaling events of death receptors such as Fas. Moreover, it was determined that the activation of caspase-3 could be blocked by the presence of a specific caspase-8 inhibitor, again linking death receptor-associated proteases to downstream effector caspase activity in alcohol-related death. Finally, ethanol administration was found to result in an increase in the amount of Fas protein present in the membrane fraction of the cell. The increase in membrane Fas protein indicates ligand-independent membrane targeting of Fas in the alcohol-treated cells that could potentially be a key signaling event in the induction of the proapoptotic caspase cascade. Conclusions: The data presented here indicate that alcohol metabolism induces apoptosis in WIF-B cells that occurs, in part, by mechanisms involving signals emanating from death receptors.

KW - Apoptosis

KW - Caspase

KW - Ethanol

KW - Fas

KW - WIF-B Cells

UR - http://www.scopus.com/inward/record.url?scp=33750283354&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33750283354&partnerID=8YFLogxK

U2 - 10.1111/j.1530-0277.2006.00235.x

DO - 10.1111/j.1530-0277.2006.00235.x

M3 - Article

VL - 30

SP - 1906

EP - 1915

JO - Alcoholism: Clinical and Experimental Research

JF - Alcoholism: Clinical and Experimental Research

SN - 0145-6008

IS - 11

ER -