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Related Concept Videos

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...
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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

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Updated: May 21, 2026

In Situ Visualization of Axon Growth and Growth Cone Dynamics in Acute Ex Vivo Embryonic Brain Slice Cultures
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Neuronal polarity: demarcation, growth and commitment.

Alfredo Cáceres1, Bing Ye, Carlos G Dotti

  • 1Instituto Mercedes y Martín Ferreyra, Córdoba, Argentina. acaceres@immf.uncor.edu

Current Opinion in Cell Biology
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Neuronal polarity, the development of distinct cell structures like axons and dendrites, involves spatial growth restriction. This review examines the mechanisms driving polarized neuron growth.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Polarity is fundamental to biological structures, defining axes in organelles, cells, and organisms.
  • Neuronal morphological polarity initiates with the first neurite outgrowth and progresses through distinct phases.
  • Multipolar neurons exhibit a critical phase where one neurite becomes the axon, and others differentiate into dendrites.

Purpose of the Study:

  • To review recent research on the mechanisms governing polarized growth in neurons.
  • To elucidate the spatial and molecular regulation of neuronal differentiation.
  • To understand the processes underlying the development of neuronal architecture.

Main Methods:

  • Review of current literature on neuronal polarity.
  • Analysis of studies investigating spatial restriction of growth activity.
  • Examination of molecular and morphological features of developing neurons.

Main Results:

  • Neuronal polarity development occurs in three distinct phases, each requiring spatial restriction of growth.
  • Axon and dendrite differentiation involves acquiring specific morphological and molecular characteristics.
  • Understanding these mechanisms is key to comprehending neuronal identity and function.

Conclusions:

  • Polarized growth is a tightly regulated process essential for neuronal development.
  • Spatial restriction of growth activity is a prerequisite for each phase of neuronal polarization.
  • Further research into these mechanisms will advance our understanding of neural development and function.