SUIT-008 O2 pfi D014

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SUIT-008 O2 pfi D014



Reference: A - Lemieux 2017 Sci Rep - SUIT-008

SUIT number: D014_1PM;2D;2c;3G;4S;4D;5U;6Rot;7Ama;8AsTm;9Azd

O2k-Application: O2

MitoPedia: SUIT - O2 pfi D014 protocol was used a a reference protocol in MitoEAGLE project (WG2) to evaluate the researcher skills preparing permeabilized fibers
SUIT protocol pattern: 1PM;2D;3G;4S;5U;6Rot

The SUIT-008 O2 pfi D014 protocol is designed to assess the additivity between the N- and S-pathway in the Q-junction, providing a physiologically relevant estimate of maximum mitochondrial respiratory capacity in permeabilized fibers. It also serves as a diagnostic tool for the activity of the glutamate dehydrogenase and its linked pathways, which could be relevant in some pathologies. SUIT-008 O2 pfi D014 can be easily extended with the CIV assay module. Permeabilized muscle fibers are sensitive to oxygen supply due to limited diffusion of oxygen to the fiber bundle core. To counteract this limitation, hyperoxic conditions (400-250 µM O2) must be employed. To set the optimal oxygen concentration in the O2k-Chamber, see Setting the oxygen concentration.

Communicated by Huete-Ortega M, Iglesias-Gonzalez J and Gnaiger E (last update 2019-06-06)

Representative traces

D014 O2 traces.png

MitoPedia: SUIT

Steps and respiratory states


Step State Pathway Q-junction Comment - Events (E) and Marks (M)
2c PMcP N CI 1PM;2D;2c
  • NADH-linked substrates (type N-pathway to Q).
  • Addition of cytochrome c yields a test for integrity of the mtOM. Stimulation by added cytochrome c would indicate an injury of the mtOM and limitation of respiration in the preceding state without added c due to loss of cytochrome c. Typically, cytochrome c is added immediately after the earliest ADP-activation step (P, OXPHOS capacity with saturating [ADP]).
  • OXPHOS capacity, P (with saturating [ADP]), active OXPHOS state.
3G PGMP N CI 1PM;2D;2c;3G
  • Respiratory stimulation by simultaneous action of type N substrates & succinate, with convergent electron flow in the NS-pathway for reconstitution of TCA cycle function.
  • OXPHOS capacity, P (with saturating [ADP]), active OXPHOS state.
5U PGMSE NS CI&II 1PM;2D;2c;3G;4S;5U
6Rot SE S CII 1PM;2D;2c;3G;4S;5U;6Rot
7Ama ROX 1PM;2D;2c;3G;4S;5U;6Rot;7Ama
  • Rox is the residual oxygen consumption in the ROX state, due to oxidative side reactions, estimated after addition of antimycin A (inhibitor of CIII). Rox is subtracted from oxygen flux as a baseline for all respiratory states, to obtain mitochondrial respiration (mt).
Step Respiratory state Pathway control ET-Complex entry into Q-junction Comment
## Azd ROX


Click to expand or collaps

Strengths and limitations

+ NS-OXPHOS capacity provides a physiologically relevant estimate of maximum mitochondrial respiratory capacity.
+ The presence of PGM and S establishes fully operative TCA cycle activity.
+ This protocol allows to analyse the convergence of pathways at the Q-junction (N, NS, S).
+ Mitochondrial external membrane can be measured with the addition of cytochrome c. Application of the cytochrome c test early in the protocol ensures comparability of all states in case of any effect of c.
+ Reasonable duration of the experiment.
+ Complex IV activity can be measured.
+ GM and PM yield typically identical fluxes in human skeletal muscle fibres. However, PM is the superior alternative to GM: the fraction of the N-pathway is lower and of the S-pathway is higher with GM compared to PM (GMP is inhibited by the CII inhibitor malonic acid to a larger extent than PMP). PM, therefore, yields a more sensitive assay for the diagnosis of injuries in the N-pathway, since an impairment of N-pathway capacity can be compensated partially by activation of the S-pathway. This is an advantage compared to SUIT-011 for diagnosis of N-capacity.
- Fatty acid oxidation is not analysed.
- When evaluating the additive effect of the N- and S-pathway, it has to be considered that NSP- and NSE-capacities can only be compared with NP- and SE-capacities. This is not a problem when NSP = NSE (Gnaiger 2009). In this case, it may be assumed that SP = SE (Votion et al 2012), such that NSP can be compared with NP + SP. SUIT-004 should be chosen for the additive effect in the ET-state.
- Careful washing is required after the experiment to avoid carry-over of inhibitors and uncoupler.

Compare SUIT protocols

  • SUIT-014: 1GM;2D;3P;4S;5U;6Rot-; similar version starting with GM, and then adding P. Used in combination with SUIT-008 in Lemieux 2017 for pfi.
  • SUIT-004 1PM;2D;3U;4S;5Rot- The SUIT-004 protocols provide a quick assessment of the linear coupling control (L- P- E) with NADH linked-substrates (PM) and the control in ET state (N, NS, S)
  • SUIT-011 1GM;2D;3S;4U;5Rot- The SUIT-011 protocols are designed to study physiologically relevant maximum mitochondrial respiratory capacity (OXPHOS with NS substrates) and coupling/pathway control.


Votion 2012 PLoS One2012Votion DM, Gnaiger E, Lemieux H, Mouithys-Mickalad A, Serteyn D (2012) Physical fitness and mitochondrial respiratory capacity in horse skeletal muscle. PLoS One 7:e34890.HorseSkeletal muscle

MitoPedia concepts: SUIT protocol, SUIT A, Find 

MitoPedia methods: Respirometry