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Mechanism of Ciliary Motion01:05

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
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The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
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The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
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In vivo Evaluation of Mucociliary Clearance in Mice
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Cilia Structure and Function in Human Disease.

Gregory J Pazour1

  • 1Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, USA.

Current Opinion in Endocrine and Metabolic Research
|June 5, 2024
PubMed
Summary

Ciliary dysfunction causes ciliopathies, impacting human development and health. These diseases arise from cilia's crucial roles in environmental sensing and cell coordination, affecting senses, organ development, and motility.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Human Genetics

Background:

  • Cilia are critical cellular organelles involved in environmental sensing and motility.
  • Dysfunction of cilia leads to a spectrum of human diseases known as ciliopathies.
  • These diseases highlight the essential roles of cilia in development and homeostasis.

Purpose of the Study:

  • To summarize the diverse roles of cilia in human health and disease.
  • To underscore the impact of ciliary dysfunction on sensory perception, organ development, and motility.
  • To provide an overview of ciliopathies as a class of human diseases.

Main Methods:

  • Literature review of studies on ciliary function and dysfunction.
  • Analysis of the known functions of primary and motile cilia.
  • Categorization of diseases based on affected ciliary functions.

Main Results:

  • Cilia are vital for sensory functions (vision, olfaction) and cellular communication.
  • Ciliary dysfunction results in structural birth defects and degenerative conditions.
  • Specific defects include lung disease (impaired mucociliary clearance), male infertility, and left-right axis disturbances.

Conclusions:

  • Ciliary dysfunction is the underlying cause of numerous human diseases (ciliopathies).
  • Understanding ciliary roles is key to addressing developmental and degenerative disorders.
  • Targeting ciliary mechanisms offers potential therapeutic avenues for ciliopathies.