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Related Concept Videos

Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Clark Hull's drive-reduction theory, introduced in the 1940s and 1950s and often termed the "push theory" of motivation, provides a framework for understanding how biological and learned drives influence behavior. Hull suggested that motivation originates from the need to alleviate physiological tension caused by unmet biological necessities. The theory proposes that when a basic need, such as hunger or sleep, goes unfulfilled, it creates an internal imbalance. This imbalance, or...
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Imaging Centrosomes in Fly Testes
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Structural Centrosomal Abnormalities Push Cells toward Invasion.

Pedro Monteiro1, Susana A Godinho1

  • 1Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, EC1M 6BQ London, UK.

Developmental Cell
|May 9, 2018
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Summary
This summary is machine-generated.

Structural abnormalities in centrosomes, key cell organizers, promote cancer cell spread. This study reveals how these defects enable budding in dividing epithelial cells, aiding tumor dissemination.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Structural Biology

Background:

  • Centrosomes are crucial for cell division and organization.
  • Structural centrosomal aberrations are frequently observed in cancer cells.
  • The precise role of these aberrations in cancer progression is not fully understood.

Purpose of the Study:

  • To investigate the functional impact of centrosomal structural abnormalities on cancer cell physiology.
  • To determine how centrosome defects contribute to tumor cell dissemination and metastasis.

Main Methods:

  • Analysis of centrosome structure in cancer cells.
  • Live-cell imaging to observe cell division and budding.
  • Microscopy techniques to visualize cellular structures.

Main Results:

  • Centrosome structural abnormalities were found to promote the budding of epithelial mitotic cells.
  • This budding process facilitates cell dissemination, a key step in metastasis.
  • Abnormal centrosomes alter cell division dynamics, leading to invasive phenotypes.

Conclusions:

  • Structural centrosomal defects are not merely a consequence of cancer but actively contribute to its progression.
  • Targeting centrosome abnormalities could offer novel therapeutic strategies against cancer metastasis.