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Smooth Muscle Contraction

Smooth Muscle Contraction

Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...

Actin and Myosin in Muscle Contraction

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...

Overview of Myosin Structure and Function

Overview of Myosin Structure and Function

Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X) have been well characterized.

The Role of Actin and Myosin in Non-muscle Cells

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...

Role of Myosin in Cell Migration

Role of Myosin in Cell Migration

Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...

Structure and Organization of Smooth Muscles

Structure and Organization of Smooth Muscles

Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...

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Related Experiment Video

Updated: May 8, 2026

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Published on: February 4, 2021

Vascular Smooth Muscle Myosin 2 Filaments Dynamically Assemble and Stabilize During Induced Contractility.

Sasha G Demeulenaere¹, Margaret A Bennett¹, Bradley Somerfield¹

¹Department of Cell and Molecular Physiology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL.

Biorxiv : the Preprint Server for Biology

|May 7, 2026

Summary

Smooth muscle myosin II (SMII) filaments dynamically assemble and exchange in vascular smooth muscle cells (SMCs). Induced contraction stabilizes SMII filaments, revealing a dynamic pool essential for regulating blood vessel contractility.

Keywords:

Myh11 Smooth muscle assembly myosin 2

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Published on: May 4, 2022

Area of Science:

Cell Biology
Biophysics
Physiology

Background:

Vascular smooth muscle cells (SMCs) regulate blood pressure and vessel integrity through dynamic changes in diameter.
Smooth muscle myosin II (SMII) is crucial for SMC contraction, assembling into filaments that interact with actin.
The precise mechanisms of SMII filament assembly and dynamics in living SMCs remain largely undefined.

Purpose of the Study:

To investigate the dynamic assembly and exchange of SMII filaments in vascular SMCs.
To characterize SMII dynamics during both steady-state and induced contractility.
To elucidate the role of SMII dynamics in SMC force generation and adaptation.

Main Methods:

Utilized single-cell filament assembly assays and fluorescence recovery after photobleaching (FRAP) in cultured rat aortic SMCs expressing EGFP-SMII.
Employed traction force microscopy to measure force production changes.
Developed a CRISPR knock-in EGFP-SMII murine model for studying endogenous SMII dynamics in primary SMCs and intact arterioles.

Main Results:

Induced contraction significantly increased SMII filament assembly and stabilized existing filaments.
FRAP demonstrated rapid SMII exchange kinetics, comparable to non-muscle myosin II.
Super-resolution imaging indicated co-assembly of SMII and non-muscle myosin II filaments.
Studies in primary SMCs and intact arterioles confirmed similar dynamic behaviors and activation-dependent stabilization of endogenous SMII.

Conclusions:

SMII exhibits surprisingly dynamic behavior in vascular SMCs, co-assembling with non-muscle myosin II.
Vascular SMC activation enhances SMII filament assembly while reducing filament exchange, stabilizing the SMII pool for force generation.
These findings support a model where dynamic SMII regulation allows vascular SMCs to adapt contractility to environmental cues.