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ABC Transporters: Exporter01:31

ABC Transporters: Exporter

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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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ABC Transporters: Importer01:27

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ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
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Active Transport01:14

Active Transport

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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
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Drug Absorption Mechanism: Carrier-Mediated Membrane Transport01:19

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Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
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The ADP/ATP Carrier Protein01:42

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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Aluminum and ABC transporter activity.

Goezde Oezen1, Lisa Kraus1, Eva-Maria Schentarra1

  • 1Institute of Pharmacy and Molecular Biotechnology, Ruprecht-Karls University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States.

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Aluminum salts did not affect the activity of key efflux transporters, including P-glycoprotein (P-GP), Breast Cancer Resistance Protein (BCRP), and Multidrug Resistance-associated Protein 2 (MRP2). This finding contrasts with other metal salts and has implications for understanding aluminum

Keywords:
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Area of Science:

  • Biochemistry
  • Toxicology
  • Cell Biology

Background:

  • Aluminum is abundant and widely used, but overexposure poses health risks.
  • ATP-binding cassette (ABC) transporters play crucial roles in cellular efflux.
  • Previous studies showed heavy metals modulate ABC transporter activity.

Purpose of the Study:

  • To investigate the impact of aluminum salts on ABC transporter activity.
  • To assess aluminum's effect on human and fish ABC transporters.

Main Methods:

  • Utilized human blood-brain barrier cells (hCMEC/D3) expressing P-GP.
  • Employed MDCKII cells overexpressing BCRP and MRP2.
  • Examined freshly isolated Atlantic killifish kidney tubules expressing analog transporters.

Main Results:

  • Aluminum salts showed no modulatory effect on the efflux activity of human P-GP, BCRP, and MRP2.
  • No modulatory effect was observed on the analog transporters P-gp, Bcrp, and Mrp2 in killifish tubules.
  • Results contrast with inhibitory or stimulatory effects of other metal salts.

Conclusions:

  • Aluminum salts do not appear to modulate the function of major ABC efflux transporters.
  • This suggests a different toxicological mechanism for aluminum compared to other heavy metals.