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Related Concept Videos

Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomes01:30

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...

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Updated: Jul 19, 2026

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes
05:57

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

Published on: December 19, 2025

Peroxisomal membrane permeability and solute transfer.

Vasily D Antonenkov1, J Kalervo Hiltunen

  • 1Department of Biochemistry and Biocenter Oulu, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland. vasily.antonenkov@oulu.fi

Biochimica Et Biophysica Acta
|October 19, 2006
PubMed
Summary

Mammalian peroxisomal membranes allow small molecules through channels but require transporters for bulky solutes like ATP and cofactors. Recent studies reveal channel activities influencing metabolite transport and shuttle systems.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Transport

Background:

  • Peroxisomal membrane permeability to solutes has been debated for over 40 years.
  • Mammalian peroxisomal membranes are permeable to small molecules but act as a barrier to larger ones.
  • Specific transporters are necessary for moving bulky solutes across the peroxisomal membrane.

Purpose of the Study:

  • To review recent advancements in understanding peroxisomal membrane permeability.
  • To discuss the role of pore-forming channels and transporters in solute movement.
  • To explore the function of peroxisomal channels in metabolite transfer and shuttle systems.

Main Methods:

  • Literature review of recent studies on peroxisomal membrane permeability.
  • Analysis of electrophysiological data identifying channel-forming activities.
  • Discussion of solute transport mechanisms across the peroxisomal membrane.

Main Results:

  • Mammalian peroxisomal membranes possess pore-forming channels permeable to small solutes.
  • The membrane restricts the passage of bulky solutes such as cofactors (NAD/H, NADP/H, CoA, ATP) and their esters.
  • Electrophysiological studies confirm channel activities in the peroxisomal membrane.

Conclusions:

  • Peroxisomal membrane permeability is regulated by both channels and specific transporters.
  • Channels may facilitate the transfer of small metabolites.
  • Peroxisomal channels are implicated in the formation of peroxisomal shuttle systems.