Migrating Motility Complex
Migrating Motility Complex - Related Videos
08:52
An Introduction to Cell Motility and Migration
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Cell motility and migration play important roles in both normal biology and in disease. On one hand, migration allows cells to generate complex tissues and organs during development, but on the other hand, the same mechanisms are used by tumor cells to move and spread in a process known as cancer metastasis. One of the primary cellular machineries that make cell movement possible is an intracellular network of myosin and actin molecules, together known as “actomyosin”, which creates a...
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A Quantitative Evaluation of Cell Migration by the Phagokinetic Track Motility Assay
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The phagokinetic motility track assay is a method used to assess the movement of cells. Specifically, the assay measures chemokinesis (random cell motility) over time in a quantitative manner. The assay takes advantage of the ability of cells to create a measurable track of their movement on colloidal gold-coated coverslips.
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The Transwell Migration Assay
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Cells migration in response to chemical cues is crucial to development, immunity and disease states such as cancer. To quantify cell migration, a simple assay was developed in 1961 by Dr. Stephen Boyden, which is now known as the transwell migration assay or Boyden chamber assay. This set-up consists an insert which separates the wells of a multiwell plate into top and bottom compartments. Cells whose migration is to be studied are seeded into the top compartment and the chemoattractant...
02:46
Swarming Assay for Visualizing Bacterial Surface Motility
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2025
Source: Morales-Soto, N. et. al., Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays. J. Vis. Exp. (2015)This video demonstrates a swarming assay using bacteria that express green fluorescent protein to observe surface motility on soft agar. Time-lapse imaging captures coordinated expansion and tendril formation, highlighting bacterial surface motility.
FAQs
Rather than producing uniform contractions, the cycle shifts from a quiescent period to progressively stronger activity. This staged pattern provides a transition from limited movement to forceful contractions, allowing contents remaining in the stomach and small intestine to be advanced in an organized sequence. The phase progression is therefore central to maintaining transit during fasting.
In humans, motilin signaling can initiate the migrating motility complex. This identifies motilin as a trigger for the coordinated electrical and muscular events that follow. Investigators can therefore examine motilin-related initiation when studying why fasting-associated contractions begin, how signaling relates to intestinal transit, or whether altered initiation contributes to dysmotility.
Electrical and muscular activity is coordinated so that the contraction pattern propagates distally, meaning toward the farther end of the gastrointestinal tract. This directional organization links signaling with movement rather than producing isolated local contractions. In biological studies, tracking that propagation helps distinguish an organized migrating pattern from impaired coordination that may disrupt transit.
Clearing residual food, secretions, and cellular debris reduces material left behind during fasting. That cleaning function supports intestinal hygiene while also regulating how contents move through the tract. Consequently, the complex is relevant not only to contraction strength but also to the maintenance of a functioning intestinal environment between meals.
Measurements of its phase progression, initiation, and distal propagation can reveal how gastrointestinal electrical activity and muscle contractions work together. These observations provide a framework for characterizing normal gastrointestinal physiology, especially the movement and clearance that occur between meals. They also establish reference features against which altered transit or other motility problems can be considered.
Disruptions in the complex may be considered when gastrointestinal movement is abnormal, because the pattern normally contributes to transit and removal of residual material during fasting. Researchers can use this physiological context to investigate disorders involving dysmotility or altered transit. The same framework may help examine impaired gut-brain signaling when coordinated digestive activity is affected.