Domenis 2011 J Bioenerg Biomembr

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Domenis R, Comelli M, Bisetto E, Mavelli I (2011) Mitochondrial bioenergetic profile and responses to metabolic inhibition in human hepatocarcinoma cell lines with distinct differentiation characteristics. J Bioenerg Biomembr 43: 493-505.

» PMID:21882038

Domenis R, Comelli M, Bisetto E, Mavelli I (2011) J Bioenerg Biomembr

Abstract: The classical view of tumour cell bioenergetics has been recently revised. Then, the definition of the mitochondrial profile is considered of fundamental importance for the development of anti-cancer therapies, but it still needs to be clarified. We investigated two human hepatocellular carcinoma cell lines: the partially differentiated HepG2 and the undifferentiated JHH-6. High-resolution respirometry revealed a marked impairment/uncoupling of OXPHOS in JHH-6 compared with HepG2, with the phosphorylation system limiting the capacity for electron transport much more in JHH-6. Blocking glycolysis or mitochondrial ATP synthase we demonstrated that in JHH-6 ATP synthase functions in reverse and consumes glycolytic ATP, thereby sustaining ΔΨm. A higher expression level of ATP synthase Inhibitor Factor 1 (IF1), a higher extent of IF1 bound to ATP synthase and a lower ATPase/synthase capacity were documented in JHH-6. Thus, here IF1 appears to down-regulate the reverse mode of ATPsynthase activity, thereby playing a crucial role in controlling energy waste and ΔΨm. These results, while confirming the over-expression of IF1 in cancer cells, are the first to indicate an inverse link between cell differentiation status and IF1 (expression level and regulatory function).

O2k-Network Lab: IT_Udine_Grassi B, IT Udine Mavelli I

Labels: Pathology: Cancer 

Organism: Human  Tissue;cell: Liver  Preparation: Intact cells 

Coupling state: OXPHOS 

HRR: Oxygraph-2k