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Related Concept Videos

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The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Postsynaptic Potential (PSP)01:32

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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Related Experiment Video

Updated: Mar 16, 2026

Presynapse Formation Assay Using Presynapse Organizer Beads and &ldquo;Neuron Ball&rdquo; Culture
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The initiation of post-synaptic protrusions.

Pirta Hotulainen1, Juha Saarikangas2

  • 1Neuroscience Center, University of Helsinki, Helsinki, Finland; Minerva Foundation Institute for Medical Research, Helsinki, Finland.

Communicative & Integrative Biology
|August 5, 2016
PubMed
Summary
This summary is machine-generated.

Scientists discovered that the I-BAR protein MIM/Mtss1 bends membranes, initiating dendritic spine formation. This process, activated by phosphatidylinositol (PI(4,5)P2) signaling, coordinates actin assembly for neuronal structure and cognitive function.

Keywords:
Arp2/3 complexactin cytoskeletonfilopodialipid demixingmembrane deformation

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Post-synaptic spines are crucial for neuronal function and cognitive performance.
  • Actin polymerization drives spine morphology but its regulation is unclear.

Purpose of the Study:

  • Investigate the role of membrane bending in initiating dendritic spine formation.
  • Elucidate the spatial and temporal regulation of actin assembly during spine morphogenesis.

Main Methods:

  • Investigated the function of the I-BAR protein MIM/Mtss1 in membrane bending.
  • Examined the role of phosphatidylinositol (PI(4,5)P2) signaling in spine initiation.
  • Developed a model for protein-lipid microdomain-driven cell protrusions.

Main Results:

  • MIM/Mtss1 directly bends neuronal membranes, initiating dendritic spine formation.
  • Phosphatidylinositol (PI(4,5)P2) signaling activates membrane bending and actin assembly.
  • Coordinated actin assembly is spatially regulated by lipid-activated membrane bending.

Conclusions:

  • Membrane bending by MIM/Mtss1 is a key mechanism for dendritic spine initiation.
  • Protein-lipid microdomains are critical for coordinating actin assembly and cell protrusion formation.
  • Findings provide a general model for understanding cell protrusion dynamics.