Cited by 417Liver physiology and pathologyLiver Diseases and ImmunityLiver Disease Diagnosis and Treatment

Apoptotic Body Engulfment by a Human Stellate Cell Line Is Profibrogenic

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Canbay, Ali, Taimr, Pavel, Torok, Natalie, Higuchi, Hajime, Friedman, Scott, Gores, Gregory J·2003·Laboratory Investigation

Abstract

Hepatocyte apoptosis and stellate cell activation are both features of chronic liver diseases, but a relationship between these events has not been explored. In macrophages, engulfment of apoptotic bodies induces expression of transforming growth factor-beta (TGF-beta), a profibrogenic cytokine. We examined whether a similar response occurs in stellate cells. Fluorescently labeled hepatocyte apoptotic bodies were added to cultures of primary and immortalized human stellate cells. Stellate cells, but not hepatocytes, readily engulfed apoptotic bodies in a time-dependent manner as assessed by confocal microscopy. The activation of primary and immortalized human stellate cells after incubation with apoptotic bodies, as well as their fibrogenic activity, was indicated by an increase in alpha-smooth muscle actin (primary cells), TGF-beta1, and collagen alpha1(I) mRNA (primary and immortalized cells). The profibrogenic response was dependent upon apoptotic body engulfment, because nocodazole, a microtubule-inhibiting agent, blocked both the engulfment and the increase of TGF-beta1 and collagen alpha1(I) mRNA. As described in primary rodent stellate cells, up-regulation of collagen alpha1(I) mRNA was inhibited by a PI-3K inhibitor (LY294002) and a p38 mitogen-activated protein kinase inhibitor (SB203580) in LX-1 cells. In conclusion, these data support a model in which engulfment of hepatocyte apoptotic bodies by stellate cells leads to a fibrogenic response by eliciting a kinase-signaling pathway.

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Crossref · 10.1097/01.lab.0000069036.63405.5c

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  • HSC line LX-1 can engulf apoptotic bodies of hepatocytes, inducing pro-fibrogenic activation in vitro via NADPH oxidase and PI3K/p38 MAPK-dependent mechanisms.

    “Earlier in vitro studies reported that HSC line LX-1 is able to engulf apoptotic bodies of hepatocytes, which induced pro-fibrogenic activation in vitro via a nicotinamide adenine dinucleotide phosphate oxidase20 and phosphoinositide 3-kinase/p38 mitogen-activated protein kinase-dependent manner21.”
  • Dying or damaged hepatocytes release damage-associated molecular patterns, including HMGB1, SPP1, P2Y14 ligands, apoptotic bodies, miRNA, and DNA, which can be taken up by HSCs and activate them into collagen-producing myofibroblasts.

    “Dying or damaged hepatocytes secrete damage-associated molecular patterns including high mobility group box 1 protein (HMGB1), osteopontin (SPP1), purinoceptor 14 (P2Y14) ligands, apoptotic bodies, microRNA (miRNA), and DNA that can be packaged into microvesicles and directly taken up by HSCs, leading to their activation into collagen-producing myofibroblasts (see “Cellular plasticity”, below) (23”

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Authors
Canbay, A., Taimr, P., Torok, N., Higuchi, H., Friedman, S., & Gores, G. J.
Affiliations
  • Mayo Clinic (US)
  • Icahn School of Medicine at Mount Sinai (US)
Corresponding author
Gores, Gregory J
Venue
Laboratory Investigation
Publisher
Elsevier BV
Published
2003-05
Volume
83
Issue
5
Pages
655-663
ISSN
0023-6837 (ISSN-L)
OpenAlex
W2089907961
Cited by
417
References
42
Citations by year
2026: 5 · 2025: 10 · 2024: 13 · 2023: 23 · 2022: 15 · 2021: 19 · 2020: 29 · 2019: 10 · 2018: 20 · 2017: 31 · 2016: 13 · 2015: 11 · 2014: 33 · 2013: 13 · 2012: 18
FWCI
9.82
Type
journal article
Language
en
Open access
Locations
  • Laboratory Investigation (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Mayo Foundation for Medical Education and Research
  • US-UK Fulbright Commission
  • Deutscher Akademischer Austauschdienst
  • National Institutes of Health (DK 41876, DK56621)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK37430, DK 56621, DK-41876)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
Keywords
hepatic stellate cells, hepatocyte apoptosis, liver fibrosis, TGF-β1, stellate cell activation, PI3K signaling, p38 MAPK signaling, chronic liver disease
MeSH terms
Cell Line, Humans, Liver Cirrhosis, Microtubules, RNA, Messenger, Nocodazole, Transforming Growth Factor beta, Apoptosis, Phosphatidylinositol 3-Kinases, Mitogen-Activated Protein Kinases, Hepatocytes, Collagen Type I, p38 Mitogen-Activated Protein Kinases, Transforming Growth Factor beta1

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