The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
Modulation of the mitochondrial cyclosporin A-sensitive permeability transition pore by the proton electrochemical gradient. Evidence that the pore can be opened by membrane depolarization.
Open accessAbstract
This paper reports an investigation on the relationship between the proton electrochemical gradient (delta mu H+) and the cyclosporin A-sensitive permeability transition pore (PTP) in rat liver mitochondria. Using the SH group cross-linker phenylarsine oxide as the inducer, we show that both matrix pH and the membrane potential can modulate the process of PTP induction independently of Ca2+. We find that membrane depolarization induces the PTP per se when pHi is above 7.0, while at acidic matrix pH values PTP induction is effectively prevented. Since Ca2+ uptake leads to major modifications of the delta mu H+ (i.e. matrix alkalinization and membrane depolarization), we have explored the possibility that the Ca(2+)-induced changes of the delta mu H+ may contribute to PTP induction by Ca2+. Our data in mitochondria treated with Ca2+ plus N-ethylmaleimide and Ca2+ plus phosphate show that membrane depolarization is a powerful inducer of the PTP. Taken together, our observations indicate that the PTP can be controlled directly by the delta mu H+ both in the absence and presence of Ca2+, and suggest that a collapse of the membrane potential may be the cause rather than the consequence of PTP induction under many experimental conditions. Thus, many inducers may converge on dissipation of the membrane potential component of the delta mu H+ by a variety of mechanisms.
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Cites
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Metadata
- Authors
- Bernardi, P.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1992-05
- Volume
- 267
- Issue
- 13
- Pages
- 8834-8839
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1482769266
- Cited by
- 448
- References
- 3
- FWCI
- 4.45
- Type
- journal article
- Language
- en
- Open access
- hybrid
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