ISSN:
1573-4919
Keywords:
mCICR
;
low-conductance conformation
;
high-conductance conformation
;
permeability transition pore
;
mitochondria
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract The permeability transition pore (PTP) is central for mitochondria function. PTP either open in low-conductance state to carry out mCICR (Ca2+-induced Ca2+ release from mitochondria) and play roles in cell phsyiological activities or open in high-conductance conformation to release harmful substances and play important roles in cell pathological responses and apoptosis. The results of study on the relationship between mCICR and PTP opening show Ca2+ concentrations but not the Ca2+ delivery mode determined the occurrence of mCICR or PTP opening. Ca2+-induced PTP opening began with and depended on mCICR. mCICR was a prerequisite for H2O2 and As2O3-induced PTP opening. The results indicated that the PTP opening was determined by Ca2+ stimulation intensity but not mode. PTP could switch from low- to high-conductance conformation and the PTP open by high-conductance began with low-conductance state. mCICR is necessary for Ca2+-dependent PTP opening. Our data suggested also that it would be possible to control cellular responses first by modulating mCICR, then by regulating PTP opening.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007138818124
Permalink