Abstract
The effects of toxic doses of ammonia on the induction of pro-apoptotic markers in rat brain cells were studied. It was found that neither induction of caspase-9 and caspase-3, nor changes in the membrane potential in nonsynaptic brain mitochondria, release of cytochrome c from mitochondria to cytosol, or apoptosis-inducing signals in the cell nuclei, were responsible for the ammonia toxicity in vivo. Thus, no evidence was found for any functional significance of mitochondria in cell death associated with acute hyperammonemia. The resistance of cell nuclei to ammonia-induced apoptosis could be caused either by a disordered translocation of the p53 protein from the cytosol into the nucleus or by translocation of its inactive form. The nonsynaptic brain mitochondria were also shown to be more resistant to the formation of nonspecific permeability pores and to Ca2+-induced swelling than cardiac and hepatic mitochondria and, as well, supported their membrane potential even under conditions of ammonia-stimulated production of active oxygen metabolites, excessive accumulation of Ca2+, oxidative stress, and impaired energy metabolism.
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Abbreviations
- Ac-DEVD-pNa:
-
N-acetyl-Asp-Glu-Val-Asp-p-nitroanilide
- Ac-LEHD-pNa:
-
N-acetyl-Leu-Glu-His-Asp-p-nitroanilide
- Apaf-1:
-
apoptotic protease activating factor
- CCCP:
-
carbonyl cyanide 3-chlorophenylhydrazone
- CHAPS:
-
3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate
- cyt-c :
-
cytochrome
- c :
-
DOCh-Na, sodium deoxycholate
- ELISA:
-
enzyme-linked immunosorbent assay
- Mab:
-
monoclonal antibody
- NPP:
-
the nonspecific permeability pore
- PARP:
-
poly(ADP-ribose)polymerase
- pNa:
-
p-nitroaniline
- PMSF:
-
phenylmethanesulfonyl fluoride
- PBS:
-
0.1 M phosphate buffer (pH 7.4)
- RIPA:
-
buffer, a buffer solution containing 20 mM Tris-HCl (pH 7.5), 0.5 mM EDTA, 1% Nonidet, 0.5% sodium deoxycholate, 0.05% sodium dodecyl sulfate (SDS), 1 mM PMSF, 0.001 mg/ml aprotinin, and 0.002 mg/ml leupeptin
- ssDNA:
-
DNA with single-strand break
- TKM:
-
a buffer solution containing 10 mM Tris-HCl (pH 7.5), 2.5 mM KCl, and 5 mM MgCl2
- Δω:
-
the potential of the internal mitochondrial membrane
- TPP+ :
-
tetraphenylphosphonium ion
- TS buffer:
-
Tris-sucrose buffer
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Original Russian Text © Yu.G. Kaminsky, E.A. Kosenko, N.I. Venediktova, V. Felipo, C. Montoliu, 2007, published in Neirokhimiya, 2006, Vol. 23, No. 3, pp. 208–216.
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Kaminsky, Y.G., Kosenko, E.A., Venediktova, N.I. et al. Apoptotic markers in the mitochondria, cytosol, and nuclei of brain cells during ammonia toxicity. Neurochem. J. 1, 78–85 (2007). https://doi.org/10.1134/S1819712407010114
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DOI: https://doi.org/10.1134/S1819712407010114