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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Setting a Successful Sorting for Extracellular Vesicle Isolation
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Sorting it out: regulation of exosome loading.

Carolina Villarroya-Beltri1, Francesc Baixauli1, Cristina Gutiérrez-Vázquez1

  • 1Vascular Biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain; Servicio de Inmunología, Hospital de la Princesa, Madrid, Spain.

Seminars in Cancer Biology
|April 29, 2014
PubMed
Summary

Extracellular vesicles (EVs) mediate cell-cell communication. This review details molecular mechanisms controlling RNA sorting into EVs, crucial for understanding cellular interactions, especially in tumor microenvironments.

Keywords:
ExosomesExtracellular vesiclesMicroRNAsStresshnRNPs

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Extracellular vesicles (EVs) are secreted vesicles involved in intercellular communication.
  • Exosomes, a subtype of EVs, contain specific proteins and RNAs.
  • Mechanisms for protein sorting into exosomes are known, but RNA sorting mechanisms are less understood.

Purpose of the Study:

  • To review molecular mechanisms controlling molecule sorting into exosomes, focusing on RNA.
  • To discuss the impact of cellular context on exosome composition and function.
  • To highlight exosome-mediated communication in tumor biology and the tumor microenvironment.

Main Methods:

  • Literature review of molecular mechanisms for exosome biogenesis and cargo sorting.
  • Analysis of studies investigating RNA and protein sorting into EVs.
  • Synthesis of current knowledge on the role of cellular context in exosome content.

Main Results:

  • Specific molecular mechanisms govern the sorting of proteins and RNAs into exosomes.
  • RNA sorting into exosomes is a complex process involving various regulatory factors.
  • Cellular context significantly influences exosome composition, affecting intercellular communication outcomes.

Conclusions:

  • Understanding RNA sorting into EVs is critical for deciphering their role in cell-cell communication.
  • Exosomes play a significant role in intercellular signaling, particularly within the tumor microenvironment.
  • Further research into EV cargo sorting mechanisms will advance therapeutic strategies.