Monocarboxylate (Lactate) transporter

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Monocarboxylate transporters,[1] or MCTs, constitute a family of proton-linked plasma membrane transporters that carry molecules having one carboxylate group (monocarboxylates), such as lactate and pyruvate.

Chemical equation

Lactate_{in} \rightleftharpoons Lactate_{out}

Rate equation

Reversible Michaelis-Menten rate law is used

Failed to parse (Cannot store math image on filesystem.): \frac{Vmf \times \frac{[Lactate_{in}]}{Km_{Lactate_{in}}} - Vmr \times \frac{[Lactate_{out}]}{Km_{Lactate_{out}}}}{1 + \frac{[Lactate_{in}]}{Km_{Lactate_{in}}} + \frac{[Lactate_{out}]}{Km_{Lactate_{out}}}}

Parameter values

Parameter Value Units Organism Remarks
V_{mf} 2.5 [2] \text{mM min}^{-1} Human tumor cells
Km_{Lactate_{in}} 4.5 [3] mM Rat liver cell
V_{mr} 2.4 [3] \text{mM min}^{-1} Rat liver cells
Km_{Lactate_{out}} 4.54 [2] mM Human tumor cells

References

  1. ↑ Halestrap AP, Meredith D (2004). The SLC16 gene family-from monocarboxylate transporters (MCTs) to aromatic amino acid transporters and beyond. Pflugers Arch. 447 (5): 619–28 (doi)
  2. ↑ 2.0 2.1 Manning Fox JE et. al. (2000). Characterisation of human monocarboxylate transporter 4 substantiates its role in lactic acid efflux from skeletal muscle. J Physiol 529(Pt2):285-293
  3. ↑ 3.0 3.1 Jackson VN, Halestrap AP (1996) The kinetics, substrate, and inhibitor specificity of the monocarboxylate (lactate) transporter of rat liver cells determined using the fluorescent intracellular pH indicator, 2’,7’-bis(carboxyethyl)-5(6)-carboxyfluorescein. J Biol Chem 271:861–868
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