Abstract
Mitochondria serve a plethora of functions, beyond the essential production of ATP, that are intimately involved in the definition of cellular physiology and pathology. These roles include the buffering and decoding of signalling, induction of programmed cell death and steroidogenesis.
The biochemical pathways that define steroidgenesis have been largely investigated, but proteins and pathways regulating its efficiency are not yet fully understood. The 18 kDa protein translocator protein (TSPO), named so for its ability to shuttle cholesterol into the mitochondria feeding the synthesis of pregnenolone, plays an active part in this process. However its relevance for mitochondrial, and hence cellular, homeostasis is likely broader encompassing other processes.
TSPO is a highly inducible protein which interacts with the voltage-dependent anion channel 1 (VDAC1) and is associated with intracellular redox stress, thereby interfering with the autophagic quality control mechanisms of mitochondria (mitophagy). Functioning as a stress-response element, TSPO holds a remarkably conserved sequence and structure throughout evolution. Through its associations with a wide range of cellular and pathological processes, it naturally represents a prognostic and therapeutic target to infer human and animal welfare. In this chapter, we shall recapitulate the current literature available on TSPO, discussing its compelling science and presenting the most recent breakthroughs on its structure and function. The overall goal is to illustrate the ways in which TSPO partakes in mitochondrial and cellular processes.
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Abbreviations
- Å:
-
Ångström
- ACBD:
-
Acyl-coenzyme A binding domain containing
- ACTH:
-
Adrenocorticotropin
- AD:
-
Alzheimer’s disease
- ALAS-1:
-
5′-aminolevulinate synthase 1
- ANT:
-
Adenine nucleotide transporter
- AP:
-
Activator protein
- Atg8:
-
Autophagy related protein 8
- Bcl-2:
-
B-cell lymphoma 2
- BcTSPO:
-
Bacillus cereus TspO
- cAMP:
-
Cyclic adenosine monophosphate
- CARC:
-
Cholesterol consensus domain
- CNS:
-
Central nervous system
- CRAC:
-
Cholesterol recognition amino acid consensus
- CRF:
-
Corticotropin-releasing factor
- DBI:
-
Diazepam-binding inhibitor
- EM:
-
Electron microscopy
- ERα:
-
Oestrogen receptor α
- Ets:
-
E26 oncogene homolog
- FCCP:
-
Carbonyl cyanide p-(trifluoromethoxy) phenylhydrazone
- GABA:
-
Gamma-aminobutyric acid
- HIV:
-
Human immunodeficiency virus
- HPA:
-
Hypothalamic-pituitary-adrenal
- KO:
-
Knockout
- I/R:
-
Ischemia/reperfusion
- LC3:
-
Microtubule-associated protein light chain 3
- mPTP:
-
Mitochondrial permeability transition pore
- MS:
-
Multiple sclerosis
- mTSPO:
-
Mammalian TSPO
- NAT:
-
Natural antisense transcript
- NLRP3:
-
Nod-like receptor family, pyrin domain containing 3
- NMR:
-
Nuclear magnetic resonance
- NOX:
-
NADPH oxidase
- OMM:
-
Outer mitochondrial membrane
- PBR:
-
Peripheral-type benzodiazepine receptor
- PD:
-
Parkinson’s disease
- PEPCK:
-
Phosphoenolpyruvate carboxykinase
- PET:
-
Positron emission tomography
- PGC-1α:
-
PPAR-gamma coactivator-1 α
- PINK1:
-
PTEN-induced putative kinase 1
- PKA:
-
Protein kinase A
- PKCε:
-
Protein kinase Cε
- PMA:
-
Phorbol-12-myristate 13-acetate
- PPAR:
-
Peroxisome proliferator-activated receptor
- PpIX:
-
Protoporphyrin IX
- ROS:
-
Reactive oxygen species
- RsTspO:
-
R. sphaeroides TspO
- Sp:
-
Specificity protein
- StAR:
-
Steroidogenic acute response protein
- STAT:
-
Signal transducer and activator of transcription
- TM:
-
Transmembrane (number assignment for helices in TSPO structure)
- TSPO:
-
Translocator protein
- TspO:
-
Tryptophan-rich sensory protein
- VDAC:
-
Voltage gated anion channel
- WT:
-
Wild type
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Acknowledgements
The research activities on TSPO led by M.C. are supported by the following funders gratefully acknowledged: Biotechnology and Biological Sciences Research Council [grant number BB/M010384/1]; the Medical Research Council [grant number G1100809/2]; Bloomsbury Colleges Consortium PhD Studentship Scheme; the London Interdisciplinary Biosciences Consortium; the Petplan Charitable Trust; Umberto Veronesi Foundation, Marie Curie Actions, the LAM-Bighi Grant Initiative and the Italian Ministry of Health [IFO14/01/R/52].
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Frison, M., Mallach, A.K., Kennedy, E., Campanella, M. (2017). The 18 kDa Translocator Protein (TSPO): Cholesterol Trafficking and the Biology of a Prognostic and Therapeutic Mitochondrial Target. In: Rostovtseva, T. (eds) Molecular Basis for Mitochondrial Signaling. Biological and Medical Physics, Biomedical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-55539-3_11
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