What is MCT1 and MCT4?
MCT4 has been described to hold a major role in the export of monocarboxylic acids such as lactate, whereas MCT1 has been reciprocally characterized to function in the intracellular influx of monocarboxylic acids [40].
Is MCT1 an enzyme?
Proton-linked monocarboxylate transporter, member 1 (MCT-1) is an enzyme that catalyzes the movement of several monocarboxylates (e.g., lactate, pyruvate, valine, leucine-derived branched-chain oxo-acids, and ketone bodies) across the plasma membrane.
What is MCT1 gene?
Monocarboxylate transporter 1 is a ubiquitous protein that in humans is encoded by the SLC16A1 gene (also known as MCT1). It is a proton coupled monocarboxylate transporter.
What is the function of Monocarboxylate transport proteins?
Monocarboxylate transporters (MCTs) catalyze the proton-linked transport of monocarboxylates such as L-lactate, pyruvate, and the ketone bodies across the plasma membrane. There are four isoforms, MCTs 1-4, which are known to perform this function in mammals, each with distinct substrate and inhibitor affinities.
Where is MCT4 located?
MCT4 is primarily expressed in glycolytic cells including fast twitch muscle, neural retina and activated macrophages where it facilitates the efflux of lactate (10–12). Warburg was the first to show that cancer cells often exhibit a high rate of aerobic glycolysis producing large amounts of lactate.
Where are Monocarboxylate transporters?
Monocarboxylate transporters (MCTs) are a family of 14 receptors. Most are expressed on the membrane of brain cells and facilitate passive transport of lactate, pyruvate and ketone bodies into the brain (Perez-Escuredo et al., 2016).
Does MCT1 use facilitated diffusion?
Substrates such as glucose, amino acids, and lactate are moved into and out of cells by facilitated diffusion. Without glucose, MCT1 mRNA was not expressed, and immunoreactivity dramatically reduced in intensity as morulae died.
How is lactate transported?
Lactate is transported across cell membranes by diffusional, saturable cotransport with protons, mediated by monocarboxylate transporters (MCTs). The predominant MCT in neurons is the high-affinity MCT2, which can only increase its activity to a limited extent in the face of an increased lactate gradient.
What is the function of the protein product of the slc16a11 gene?
It catalyzes the transport of pyruvate across the plasma membrane (PubMed:28666119).
What is the role of MCT1?
The functional activity of MCT1 is dependent on a proton gradient, and it facilitates the unidirectional proton-linked transport of monocarboxylates across the plasma membrane. Transport process can be stimulated by a pH gradient (low to high) as well (Broer et al., 1998).
What are MCT transporters?
Monocarboxylate transporters (MCTs) are other important plasma membrane transporters that catalyze the proton-linked transport of monocarboxylates such as lactate and pyruvate, which play a major role in cell metabolism and metabolic communication between tissues.
What do Monocarboxylate transporters transport?
What does MCT4 stand for?
Monocarboxylate transporter 4 (MCT4) also known as solute carrier family 16 member 3 is a protein that in humans is encoded by the SLC16A3 gene. Northern and western blotting and EST database analyses showed MCT4 to be widely expressed and especially so in glycolytic tissues such as white skeletal muscle fibers, astrocytes, white blood cells,…
Is MCT1 found in the human heart?
Transcripts of MCT1 and MCT4 are detectable in rat and human skeletal muscle and in the heart. However, only skeletal muscle expresses both the MCT1 and MCT4 proteins, whereas rat heart expresses the MCTI, but not the MCT4 protein.
Can MCT1 and MCT4 be cloned?
In the past few years a family of MCTs (MCT1-MCT7) has been cloned. Transcripts of MCT1 and MCT4 are detectable in rat and human skeletal muscle and in the heart. However, only skeletal muscle expresses both the MCT1 and MCT4 proteins, whereas rat heart expresses the MCTI, but not the MCT4 protein.
How are MCT1 and MCT4 expression regulated in skeletal muscle?
It appears that MCT1 and MCT4 expression are regulated in a tissue-specific and isoform-specific manner. Therefore, skeletal muscle lactate concentrations are not only regulated by the rate of glycolysis, but also by the efficiency of trans-sarcolemmal lactate transport, a process that is regulated by the quantity of available MCT proteins.