Volume 17, Issue 1 (Spring 2013)                   Physiol Pharmacol 2013, 17(1): 80-93 | Back to browse issues page

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Fahanikbabaei J, Jafari A, Eliassi A, Saghiri R. Evidences for a new cation channel in the brain mitochondrial inner membrane. Physiol Pharmacol 2013; 17 (1) :80-93
URL: http://ppj.phypha.ir/article-1-888-en.html
Abstract:   (9406 Views)
Introduction: Previous studies and our works have indicated several cation channels in the rat brain mitochondrial inner membrane. In this work, we report the single-channel characterization of a cation channel from the rat brain mitochondrial inner membrane incorporated into a planar lipid bilayer. Methods: After removing and homogenizing the adult rat brain, its supernatant was centrifuged in MSE-digitonin, H2O and Na2CO3, separately. Then, mitochondrial inner membrane vesicles were prepared in MSE solution. L-α- Phosphatidylcholine (for preparing membrane lipid bilayer) was extracted from fresh egg yolk. Bilayer lipid membranes were formed in a 150 μm diameter hole. All single channel recordings were filtered at 1 kHz and stored at a sampling rate of 10 kHz for offline analysis by PClamp10. Statistical analysis was performed based on Markov noise free single channel analysis. Results: The channel conductance was 93 pS in 200 mM KCl cis/50 mM KCl trans. The channel open probability appeared voltage-independent at -50 to +40 mV. The main characteristic of channel gating was its marked bursting behavior. Adding 10 mM 4-aminopyridine (4-AP) at positive and negative potentials inhibited the channel activities. Conclusion: These results demonstrate that a new cation channel, present in the brain mitochondrial inner membrane, displays different kinetics and biophysical properties than those classically described for brain mitochondria.
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Type of Manuscript: Experimental research article | Subject: Others

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