Mitochondrial temperature homeostasis resists external metabolic stresses
Terzioglu, Mügen; Veeroja, Kristo; Montonen, Toni; Ihalainen, Teemu O.; Salminen, Tiina S.; Bénit, Paule; Rustin, Pierre; Chang, Young Tae; Nagai, Takeharu; Jacobs, Howard T. (2023)
Terzioglu, Mügen
Veeroja, Kristo
Montonen, Toni
Ihalainen, Teemu O.
Salminen, Tiina S.
Bénit, Paule
Rustin, Pierre
Chang, Young Tae
Nagai, Takeharu
Jacobs, Howard T.
2023
RP89232
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202401111363
https://urn.fi/URN:NBN:fi:tuni-202401111363
Kuvaus
Peer reviewed
Tiivistelmä
Based on studies with a fluorescent reporter dye, Mito Thermo Yellow (MTY), and the genetically encoded gTEMP ratiometric fluorescent temperature indicator targeted to mitochondria, the temperature of active mitochondria in four mammalian and one insect cell line was estimated to be up to 15°C above that of the external environment to which the cells were exposed. High mitochondrial temperature was maintained in the face of a variety of metabolic stresses, including substrate starvation or modification, decreased ATP demand due to inhibition of cytosolic protein synthesis, inhibition of the mitochondrial adenine nucleotide transporter and, if an auxiliary pathway for electron transfer was available via the alternative oxidase, even respiratory poisons acting down-stream of oxidative phosphorylation (OXPHOS) complex I. We propose that the high temperature of active mitochondria is an inescapable consequence of the biochemistry of OXPHOS and is homeo-statically maintained as a primary feature of mitochondrial metabolism.
Kokoelmat
- TUNICRIS-julkaisut [18886]