Type

Other / n/a

Authors

Jochen HM Prehn
Markus Rehm
Seán M Kilbride
Heiko Düssmann
Heinrich J Huber

Subjects

Biochemistry

Topics
apoptosis membrane potential physics membrane potential mitochondrial membrane potentials theoretical hela cells cell line models theoretical mitochondrial energy metabolism mitochondria adenosine triphosphate humans caspase 3 physiology glucose cytochromes c

Glucose metabolism determines resistance of cancer cells to bioenergetic crisis after cytochrome-c release. (2011)

Abstract Many anticancer drugs activate caspases via the mitochondrial apoptosis pathway. Activation of this pathway triggers a concomitant bioenergetic crisis caused by the release of cytochrome-c (cyt-c). Cancer cells are able to evade these processes by altering metabolic and caspase activation pathways. In this study, we provide the first integrated system study of mitochondrial bioenergetics and apoptosis signalling and examine the role of mitochondrial cyt-c release in these events. In accordance with single-cell experiments, our model showed that loss of cyt-c decreased mitochondrial respiration by 95% and depolarised mitochondrial membrane potential ΔΨ(m) from -142 to -88 mV, with active caspase-3 potentiating this decrease. ATP synthase was reversed under such conditions, consuming ATP and stabilising ΔΨ(m). However, the direction and level of ATP synthase activity showed significant heterogeneity in individual cancer cells, which the model explained by variations in (i) accessible cyt-c after release and (ii) the cell's glycolytic capacity. Our results provide a quantitative and mechanistic explanation for the protective role of enhanced glucose utilisation for cancer cells to avert the otherwise lethal bioenergetic crisis associated with apoptosis initiation.
Collections Ireland -> Royal College of Surgeons in Ireland -> Physiology and Medical Physics Articles
Ireland -> Royal College of Surgeons in Ireland -> Department of Physiology and Medical Physics

Full list of authors on original publication

Jochen HM Prehn, Markus Rehm, Seán M Kilbride, Heiko Düssmann, Heinrich J Huber

Experts in our system

1
Jochen H M Prehn
Royal College of Surgeons in Ireland
Total Publications: 206
 
2
Markus Rehm
Royal College of Surgeons in Ireland
Total Publications: 55
 
3
Heiko Düssmann
Royal College of Surgeons in Ireland
Total Publications: 45
 
4
Heinrich J Huber
Royal College of Surgeons in Ireland
Total Publications: 39