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Related Concept Videos

Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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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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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
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Regulation of Nuclear Protein Sorting01:45

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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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Updated: May 31, 2026

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
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Nuclear mechanics in disease.

Monika Zwerger1, Chin Yee Ho, Jan Lammerding

  • 1Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA 02115, USA. monika.zwerger@gmail.com

Annual Review of Biomedical Engineering
|July 16, 2011
PubMed
Summary
This summary is machine-generated.

The cell nucleus, not just the cytoskeleton, significantly influences cell mechanics and function. Alterations in nuclear structure are linked to diseases like cancer and aging.

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Area of Science:

  • Cellular Biomechanics
  • Molecular Biology
  • Cellular Physiology

Background:

  • Cellular biomechanical properties are crucial for functions like migration and proliferation.
  • Research has primarily focused on the cytoskeleton and microenvironment, neglecting the nucleus.
  • The nucleus's role in cellular mechanics and function remains underexplored.

Purpose of the Study:

  • To provide an overview of the structural elements governing nuclear physical properties.
  • To discuss how nuclear component expression or mutations impact nuclear mechanics.
  • To explore the nucleus's influence on cytoskeletal organization and cellular functions.

Main Methods:

  • Literature review and synthesis of existing research on nuclear mechanics.
  • Analysis of the relationship between nuclear structure, gene expression, and protein mutations.
  • Integration of findings on nuclear contribution to cellular functions and disease.

Main Results:

  • The nucleus possesses structural elements that dictate its mechanical properties.
  • Changes in nuclear components (expression or mutations) alter nuclear mechanics.
  • Nuclear mechanics influence cytoskeletal organization and overall cellular functions.

Conclusions:

  • The nucleus is intrinsically linked to the cell's structural framework.
  • Nuclear structure and composition are vital for normal development and physiology.
  • Dysregulation of nuclear mechanics contributes to various human diseases, including cancer and aging.