Single and cell population respiratory oscillations in yeast: a 2-photon scanning laser microscopy study.

Abstract:

:Two-photon scanning laser and confocal microscopies were used to image metabolic dynamics of single or cell populations of Saccharomyces cerevisiae strain 28033. Autofluorescence of reduced nicotinamide nucleotides, and mitochondrial membrane potential (DeltaPsim), were simultaneously monitored. Spontaneous, large-scale synchronized oscillations of NAD(P)H and DeltaPsim throughout the entire population of yeasts occurred under perfusion with aerated buffer in a continuous single-layered film of organisms. These oscillations stopped in the absence of perfusion and the intracellular NAD(P)H pool became reduced. Individual mitochondria within a single yeast also showed in-phase synchronous responses with the cell population, in both tetramethylrhodamine ethyl ester (or tetramethylrhodamine methyl ester) and autofluorescence. A single, localized, laser flash also triggered mitochondrial oscillations in single cells suggesting that the mitochondrion may behave as an autonomous oscillator. We conclude that spontaneous oscillations of S. cerevisiae mitochondrial redox states and DeltaPsim occur within individual yeasts, and synchrony of populations of organisms indicates the operation of an efficient system of cell-cell interaction to produce concerted metabolic multicellular behaviour on the minute time scale in both cases.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Aon MA,Cortassa S,Lemar KM,Hayes AJ,Lloyd D

doi

10.1016/j.febslet.2006.11.068

subject

Has Abstract

pub_date

2007-01-09 00:00:00

pages

8-14

issue

1

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(06)01409-8

journal_volume

581

pub_type

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