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Mechanism of Ciliary Motion

Mechanism of Ciliary Motion

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.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

Mechanism of Ciliary Motion

Mechanism of Ciliary Motion

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.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

Microtubules in Signaling

Microtubules in Signaling

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...

Microtubules in Cell Motility

Microtubules in Cell Motility

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...

Microtubules in Cell Motility

Microtubules in Cell Motility

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...

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

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Updated: Jul 6, 2026

Artificial Intelligence Approaches to Assessing Primary Cilia

Artificial Intelligence Approaches to Assessing Primary Cilia

Published on: May 1, 2021

Structure and function of mammalian cilia.

Peter Satir¹, Søren T Christensen

¹Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA.

Histochemistry and Cell Biology

|March 28, 2008

Summary

Mammalian cilia, once studied for structure, are now understood as sensory antennae coordinating cell signaling. This discovery impacts understanding of development and human diseases.

Area of Science:

Cell Biology
Developmental Biology
Human Genetics

Background:

Cilia structure, initially examined via electron microscopy (e.g., 9+2 motile and 9+0 primary cilia), has revealed new functional insights over 50 years.
Mammalian cilia are increasingly recognized for their roles beyond motility.

Purpose of the Study:

To synthesize recent findings on mammalian cilia structure and function.
To highlight the paradigm shift in viewing cilia as central coordinators of cellular signaling pathways.
To underscore the implications of this new understanding for developmental processes and human diseases.

Main Methods:

Review of electron microscopic studies on cilia structure.
Analysis of research on ciliary signaling pathways.

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In vivo Evaluation of Mucociliary Clearance in Mice

In vivo Evaluation of Mucociliary Clearance in Mice

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Simple Detection of Primary Cilia by Immunofluorescence

Simple Detection of Primary Cilia by Immunofluorescence

Published on: May 15, 2020

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Last Updated: Jul 6, 2026

Artificial Intelligence Approaches to Assessing Primary Cilia

Artificial Intelligence Approaches to Assessing Primary Cilia

Published on: May 1, 2021

In vivo Evaluation of Mucociliary Clearance in Mice

In vivo Evaluation of Mucociliary Clearance in Mice

Published on: December 18, 2020

Simple Detection of Primary Cilia by Immunofluorescence

Simple Detection of Primary Cilia by Immunofluorescence

Published on: May 15, 2020

Integration of findings linking cilia function to cell division, differentiation, and disease.

Main Results:

Cilia function as sensory cellular antennae.
They coordinate numerous cellular signaling pathways.
Signaling can be coupled to ciliary motility, cell division, or differentiation.

Conclusions:

The revised view of cilia as sensory antennae has profound implications for developmental biology.
This perspective is crucial for understanding the etiology of various human diseases.
Further research into ciliary signaling is warranted for therapeutic advancements.