Related Experiment Video

Updated: Aug 8, 2026

Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
10:56

Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart

Published on: March 26, 2015

Immunolocalization of actin in Paramecium cells

Roland Kissmehl1, Ivonne M Sehring, Erika Wagner

  • 1Department of Biology, University of Konstanz, PO Box 5560, 78457 Konstanz, Germany.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|November 24, 2004
PubMed

Insights

Researchers developed antibodies to study actin in Paramecium, finding it concentrated in the cell cortex, associated with basal bodies, and involved in vesicle trafficking and cytoplasmic structure.

Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • Actin proteins are crucial for cellular structure and function.
  • Understanding actin's role in unicellular eukaryotes like Paramecium provides insights into fundamental biological processes.

Purpose of the Study:

  • To generate antibodies against conserved actin regions in Paramecium.
  • To investigate the localization and potential functions of actin within Paramecium cells.

Main Methods:

  • Antibody production against conserved actin regions.
  • Cell fractionation to determine actin's structural association.
  • Immunofluorescence microscopy for cellular localization.
  • Postembedding immunogold labeling with electron microscopy (EM) for high-resolution analysis.

Main Results:

  • Most Paramecium actin is structure-bound, primarily in the cell cortex.
  • Actin localizes around ciliary basal bodies, oral cavity, cytoproct, and associated with vacuoles/vesicles.
  • High-resolution EM revealed actin emanating from basal bodies and associated with vesicle formation.
  • Actin was detected within cilia and in subtle cellular arrays, suggesting roles in vesicle trafficking and cytoplasmic scaffolding.

Conclusions:

  • Paramecium actin, while not forming major filament systems, is structurally integrated and plays roles in vesicle transport and maintaining cytoplasmic organization.
  • The localization near basal bodies and involvement with vesicles highlight actin's diverse functions beyond traditional motility roles.

More Related Videos

In Vitro Polymerization of F-actin on Early Endosomes12:15

In Vitro Polymerization of F-actin on Early Endosomes

Published on: August 28, 2017

Micromanipulation Techniques Allowing Analysis of Morphogenetic Dynamics and Turnover of Cytoskeletal Regulators12:52

Micromanipulation Techniques Allowing Analysis of Morphogenetic Dynamics and Turnover of Cytoskeletal Regulators

Published on: May 12, 2018

Related Concept Videos

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
Introduction to Actin01:26

Introduction to Actin

Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across different species.
The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.