Cookies help us deliver our services. By using our services, you agree to our use of cookies. More information

Talk:Malate

From Bioblast
Bioblast wiki

Popular Bioblast page

Malate has been accessed more than
  • 15,000 times (2019-12-12)
  • 10,000 times (2017-10-12)
  • 5,000 times (2015-03-02)

Optimum malate concentration in SUIT protocols

A MiPNet publication in preparation by Sumbalova Z, Krumschnabel G, Schรถpf B, Burtscher J, Fontana-Ayoub M, Laner V, Kotb IA, Salin K, Hand SC, Ali SS, Gnaiger E et al.
Sumbalova_2016a_Abstract_MitoFit_Science_Camp_2016

The type and concentration of respiratory substrates is important for the design of substrate-uncoupler-inhibitor titration (SUIT) protocols.

0.5 mM malate saturates CI-linked respiration in combination with pyruvate and/or glutamate, whereas 2 mM malate inhibits CII-linked (succinate,rotenone) and CI&II-linked respiration, as shown in mouse heart (collaboration with the group of Sameh Ali), mouse brain homogenate, beef heart mitochondria, human permeabilized skeletal muscle fibres, dog permeabilized skeletal muscle fibers (IOC84), brine shrimp embryo (Artemia franciscana) mitochondria (collaboration with Steve Hand), fish liver and heart homogenates (post IOC80 training course).

Some representative examples are presented here.


Arctic charr liver homogenate

Char liver homogenate Malate effect.png

Fig. 1. Arctic charr liver homogenate (3.99 mg/ml, 15 ยฐC): GM0.5+D5+c+P+S+reox+U1+U2+U3+U3.5+Rot+M1+M2. Liver homogenate respiring at CII linked ETS were given 1 mM and 2 mM malate (M1 and M2), which inhibited respiration by 1.1% and 13%, respectively. Experiments post IOC80; data evaluation by Karine Salin.


Arctic charr heart homogenate

Char heart homogenate Malate effect.png

Fig. 2. Arctic charr heart homogenate (1.05 mg/ml, 15 ยฐC): G+M0.5+D5+c+P+S+reox+U1+U2+U3+U3.5+Rot(not shown)]+M1+M2+Car+Mna+Ama. Heart homogenate respiring at CII-linked ETS was given 1 mM and 2 mM malate (M1 and M2), which inhibited respiration by 7% and 15%, respectively. Adding carrier (Car) inhibited only 0.9%. Experiments post IOC80; data evaluation by Karine Salin.


Mouse brain homogenate

Mouse brain homogenate Malate effect.png

Fig. 3. Mouse brain homogenate (0.9 mg/ml): Rot+S+D2.5+Car1+M1+M2+Car2. Addition of the carrier water (Car1, Car2) had no significant impact on CII linked OXPHOS (inhibition by 2.2% and -0.2%), whereas the addition of 1 mM and 2 mM Malate (M1 and M2) inhibited respiration by 21% and 11%, respectively. Experiment in the OROBOROS MitoLab and data evaluation by Kotb IA.


Beef heart mitochondria

Beef heart Mitochondria Malate effect.png

Fig. 4. Beef heart mitochondria: Rot+S+D2.5+M2. Beef heat mitochondria respiring at CII linked OXPHOS were given 2 mM malate (M2), which inhibited respiration by 31%. Experiment in the OROBOROS MitoLab by Heidler et al.


Brine shrimp embryo mitochondria

Brine shrimp embryo mitochondria Malate effect.png

Fig. 5. Brine shrimp embryo mitochondria: Rot+S+D2.5+cyt c+ U+M0.5 (not shown)+M2+Ama. Brine shrimp embryo mitochondria respiring at CII linked ETS with 0.5 mM Malate were given 2 mM malate (M2), which inhibited respiration by 12%. Experiment in the OROBOROS MitoLab by Steve Hand et al.