Abstract
Mitochondria are widely recognized as fundamental organelles for cellular physiology and constitute the main energy source for different cellular processes. The location, morphology, and interactions of mitochondria with other organelles, such as the endoplasmic reticulum (ER), have emerged as critical events capable of determining cellular fate. Mitochondria-related functions have proven particularly relevant in neurons; mitochondria are necessary for proper neuronal morphogenesis and the highly energy-demanding synaptic transmission process. Mitochondrial health depends on balanced fusion-fission events, termed mitochondrial dynamics, to repair damaged organelles and/or improve the quality of mitochondrial function, ATP production, calcium homeostasis, and apoptosis, which represent some mitochondrial functions closely related to mitochondrial dynamics. Several neurodegenerative disorders, such as Alzheimer’s, Parkinson’s, and Huntington’s diseases, have been correlated with severe mitochondrial dysfunction. In this regard, nicotine, which has been associated with relevant neuroprotective effects mainly through activation of the nicotinic acetylcholine receptor (nAChR), exerts its effects at least in part by acting directly on mitochondrial physiology and morphology. Additionally, a recent description of mitochondrial nAChR localization suggests a nicotine-dependent mitochondrial function. In the present work, we evaluated in cultured hipocampal neurons the effects of nicotine on mitochondrial dynamics by assessing mitochondrial morphology, membrane potential, as well as interactions between mitochondria, cytoskeleton and IP3R, levels of the cofactor PGC-1α, and fission-fusion-related proteins. Our results suggest that nicotine modulates mitochondrial dynamics and influences mitochondrial association from microtubules, increasing IP3 receptor clustering showing modulation between mitochondria-ER communications, together with the increase of mitochondrial biogenesis.
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Abbreviations
- ATP:
-
adenosine triphosphate
- AMPK:
-
AMP-activated protein kinase
- ER:
-
endoplasmic reticulum
- MFN2:
-
mitofusin 2
- AraC:
-
cytosine arabinoside
- PBS:
-
phosphate-buffered saline
- PBSCAM:
-
phosphate-buffered saline/calcium magnesium
- BSA:
-
bovine serum albumin
- DIV:
-
days in vitro
- SEM:
-
standard error of the mean
- IP3R:
-
inositol 1,4,5-trisphosphate receptor
- OPA1:
-
optic atrophy 1
- DRP1:
-
dynamin-related protein 1
- PGC-1α:
-
peroxisome proliferator-activated receptor γ co-activator 1α
- ROS:
-
reactive oxygen species
- mΔΨ:
-
mitochondrial membrane potential
- α-Btx:
-
alpha-bungarotoxin
- DHβE:
-
dihydro-β-erythroidine hydrobromide
- CTCF:
-
corrected total cell fluorescence
- nAChR:
-
nicotinic acetylcholine receptor
- α7-AChR:
-
alpha7-nicotinic acetylcholine receptor
- ACh:
-
acetylcholine
- AD:
-
Alzheimer’s disease
- Wnt:
-
Wingless/integration site
- ETC:
-
electron transport chain
- mCx-I:
-
mitochondrial complex I
- MFN2:
-
mitofusin2
- mPTP:
-
mitochondrial permeability transition pore
- Mdivi-1:
-
mitochondrial division inhibitor 1
- NADH:
-
nicotinamide adenine dinucleotide
- Mt-cyb:
-
cytochrome b
- MTs:
-
microtubules
- RyR:
-
ryanodine receptor
- SERCA:
-
sarco/endoplasmic reticulum Ca+2-ATPase
- MIRO:
-
mitochondrial rho GTPase
- TOM 20:
-
translocase of outer mitochondrial membrane 20
- VDAC:
-
voltage-dependent anion channel
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Funding
This work was supported by grants AFB 170005 and CONICYT-PFB 12/2007 from the Basal Centre for Excellence in Science and Technology (CARE UC) and FONDECYT 1160724, both to NCI. JAG is a PhD student at Universitat Pompeu Fabra, Barcelona, Spain. AGV was supported by a Santander Río Ibero-American fellowship through UC and PICT-2015-1031 from the National Scientific and Technical Research Council of Argentina (CONICET).
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JAG conceived and conducted most of the experiments with mitochondria, analyzed the results and wrote most of the article. AGV conducted the western blot experiments, analyzed the results and wrote the article. NCI conceived the general idea for the project and wrote the article.
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Godoy, J.A., Valdivieso, A.G. & Inestrosa, N.C. Nicotine Modulates Mitochondrial Dynamics in Hippocampal Neurons. Mol Neurobiol 55, 8965–8977 (2018). https://doi.org/10.1007/s12035-018-1034-8
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DOI: https://doi.org/10.1007/s12035-018-1034-8