Abstract
Without a doubt, hepatocellular death exists in all types of human liver disease such as viral, metabolic, autoimmune and toxic conditions. Presently, the recommendations of the Nomenclature Committee on Cell Death 2018 are grading cell death into three morphotypes apoptosis, autophagy and necrosis. Apoptosis and necrosis represent two major modes of hepatocyte death, and apoptosis assures tissue homeostasis by the physiologic removal of damaged hepatocytes. Signaling death pathways of liver might carry significant findings for a correct treatment of hepatic disorders. Lastly, upcoming studies should reveal knowledge regarding the liver regulation of hepatic signaling death pathways. A comprising overview of hepatocyte death is developed in this chapter.
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- AIF:
-
Apoptosis-inducing factor
- ALD:
-
Alcoholic liver disease
- AP-1:
-
Activator protein-1
- AP-1:
-
The activation protein-1
- APAF-1:
-
Apoptosis protease-activating factor-1
- Atg:
-
Autophagy-related proteins
- ATP:
-
Adenosine triphosphate
- ATP:
-
Deoxyadenosine triphosphate
- Bcl-2:
-
(B-cell lymphoma-2)
- c-FLIP:
-
Cellular FLICE-like inhibitory protein
- DAMPs:
-
Damage-associated molecular patterns
- DISC:
-
The death-inducing signaling complex
- FADD:
-
Fas-associated protein with a death domain
- FasL:
-
Fas Ligand
- HMGB1:
-
Protein (high-mobility group box-1) or HMG-1 (high—mobility group)1
- Hsc70:
-
The chaperone heat shock cognate 70
- IAP:
-
Inhibitors of apoptotic proteins
- IKK complex:
-
I-kappa B kinase complex
- JNK:
-
c-Jun N-terminal kinase
- LAMP2A:
-
Lysosome-associated membrane protein 2A
- LUBAC:
-
Linear ubiquitin chain assembly complex
- MAPK:
-
Mitogen-activated protein kinase
- MAPK:
-
Mitogen-activated protein kinases
- MLKL:
-
Mixed-lineage kinase domain-like
- MOMP:
-
Mitochondrial outer membrane permeabilization
- MOMP:
-
Mitochondrial outer membrane permeabilization
- mTOR kinase:
-
The mammalian target of rapamycin kinase
- NAFLD:
-
Nonalcoholic fatty liver disease
- NASH:
-
Non-alcoholic steatohepatitis
- NF-KB:
-
Transcription factor nuclear factor
- PCD:
-
Programmed cell death
- PI3K:
-
Class III phosphatidyl inositol-3 kinase
- PRRs:
-
The pathogen recognition receptors
- PS:
-
Phosphatidylserine
- RIPK:
-
Receptor interacting protein kinase or receptor interacting serine-threonine kinase
- RIPs:
-
Receptor interacting proteins
- ROS:
-
Reactive oxygen species
- Smac:
-
Second activator of mitochondrial apoptosis
- TFEB:
-
Transcription factor EB
- TGF-β1:
-
Transforming growth factor
- TNF:
-
Tumor necrosis factor
- TNFR1:
-
TNF receptor type 1
- TNFR2:
-
TNF receptor type
- TNF-α:
-
Tumor necrosis factor
- TRADD:
-
TNF receptor associated death domain protein
- TRAF2:
-
TNF receptor-associated factor 2
- TRAIL:
-
TNF related apoptosis-inducing ligand
- TRAIL:
-
TNF-released apoptosis-inducing ligand
- TRAIL-R:
-
TNF-related apoptosis-inducing ligand receptor
- UTP:
-
Uridine triphosphate
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Self Study
Self Study
1.1 Questions
-
1.
Which statement is true?
-
(a)
Cell death is grading into four morphotypes apoptosis, autophagy, necrosis and necroptosis.
-
(b)
Apoptosis is morphologically defined by a smaller spheric cell with plasma membrane blebbing.
-
(c)
Extrinsic apoptosis as a form of incidental cell death.
-
(d)
p53 is blocked by damaged DNA.
-
(a)
-
2.
Which statement/statements is/are true?
-
(a)
Mitochondrial dysfunction is a feature for both apoptosis and necrosis.
-
(b)
Apoptosis is a feature of cholestasis, alcoholic hepatitis, non-alcoholic steatohepatitis, autoimmune hepatitis, viral hepatitis, fulminate hepatic failure, ischemia-reperfusion injury, fibrosis and cirrhosis.
-
(c)
DAMPs have low release in apoptosis, necrosis and necroptosis.
-
(d)
Extracellular cytochrome c activates apoptosome formation.
-
(a)
1.2 Answers
-
1.
Which statement is true?
-
(a)
Cell death is grading into three morphotypes apoptosis, autophagy and necrosis.
-
(b)
Hepatocyte apoptosis is morphologically defined by a smaller spheric cell, reduction of cell or ‘’cell shrinkage”, plasma membrane blebbing, chromatin condensation (pyknosis or small pyknotic nucleus), nuclear fragmentation (karyorrhexis), DNA splitting, mitochondrial permeabilization, cytoplasmic condensation (hypereosinophilic cytoplasm), followed by cell fragmentation into apoptotic bodies that are removed within lysosomes. Note: chromatin condensation is a hallmark of apoptosis CORRECT.
-
(c)
Extrinsic apoptosis as a form of regulated cell death induced or triggered by perturbations of the extracellular microenvironment that are detected by plasma membrane receptors, propagated by caspase-8 (with the optional involvement of MOMP), and precipitated by executioner caspases, mainly caspase-3.
-
(d)
p53 named the ‘’guardian of genome” is another intracellular regulator that decides if damaged DNA from undergoing apoptosis may be removed or repaired. As such, p53 is triggered by damaged DNA, ischemia, oxidative stress, hypoxia and heat shock.
-
(a)
-
2.
Which statement/statements is/are true?
-
(a)
Mitochondrial dysfunction is a significant feature for both apoptosis and necrosis but with different molecular mechanisms. CORRECT.
-
(b)
There is an increased apoptosis in cholestasis, alcoholic hepatitis, non-alcoholic steatohepatitis, autoimmune hepatitis, viral hepatitis, fulminate hepatic failure, ischemia-reperfusion injury, fibrosis and cirrhosis. In case of hepatitis, apoptosis is the major cell death, being a cytoprotective mechanism in the liver clearance from infections. CORRECT.
-
(c)
The reduced inflammatory response of apoptosis is caused by decreased discharge of DAMPs (Damage-associated molecular patterns) and rapid exclusion of apoptotic bodies. However, the mainly discharge of DAMPs appears in necrosis and necroptosis.
-
(d)
Mitochondrial cytochrome c activates apoptosome formation that is a complex containing cytochrome c, APAF-1 (apoptosis protease-activating factor-1), ATP and procaspases-9. Caspase 9 activates further caspase 3.
-
(a)
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Radu-Ionita, F., Bontas, E., Tintoiu, I.C. (2020). Hepatocellular Death: Apoptosis, Autophagy, Necrosis and Necroptosis. In: Radu-Ionita, F., Pyrsopoulos, N., Jinga, M., Tintoiu, I., Sun, Z., Bontas, E. (eds) Liver Diseases. Springer, Cham. https://doi.org/10.1007/978-3-030-24432-3_4
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