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2014 ; 10
(11
): 2087-96
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Defining and measuring autophagosome flux?concept and reality
#MMPMID25484088
Loos B
; du Toit A
; Hofmeyr JH
Autophagy
2014[]; 10
(11
): 2087-96
PMID25484088
show ga
The autophagic system is involved in both bulk degradation of primarily
long-lived cytoplasmic proteins as well as in selective degradation of
cytoplasmic organelles. Autophagic flux is often defined as a measure of
autophagic degradation activity, and a number of methods are currently utilized
to assess autophagic flux. However, despite major advances in measuring various
molecular aspects of the autophagic machinery, we remain less able to express
autophagic flux in a highly sensitive, robust, and well-quantifiable manner.
Here, we describe a conceptual framework for defining and measuring autophagosome
flux at the single-cell level. The concept discussed here is based on the
theoretical framework of metabolic control analysis, which distinguishes between
the pathway along which there is a flow of material and the quantitative measure
of this flow. By treating the autophagic system as a multistep pathway with each
step characterized by a particular rate, we are able to provide a single-cell
fluorescence live-cell imaging-based approach that describes the accurate
assessment of the complete autophagosome pool size, the autophagosome flux, and
the transition time required to turn over the intracellular autophagosome pool.
In doing so, this perspective provides clarity on whether the system is at steady
state or in a transient state moving towards a new steady state. It is hoped that
this theoretical account of quantitatively measuring autophagosome flux may
contribute towards a new direction in the field of autophagy, a standardized
approach that allows the establishment of systematic flux databases of clinically
relevant cell and tissue types that serve as important model systems for human
pathologies.