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Related Concept Videos

Introduction to Fibroblasts01:09

Introduction to Fibroblasts

Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
The Tumor Microenvironment02:17

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
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...
Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...

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Related Experiment Video

Updated: Jun 28, 2026

Murine Dermal Fibroblast Isolation by FACS
06:04

Murine Dermal Fibroblast Isolation by FACS

Published on: January 7, 2016

The myofibroblast and its tumours.

B Eyden1, S S Banerjee, P Shenjere

  • 1Department of Histopathology, Christie Hospital NHS Foundation Trust, Manchester, UK. brian.eyden@christie.nhs.uk

Journal of Clinical Pathology
|October 22, 2008
PubMed
Summary

Myofibroblastic lesions can be challenging to diagnose due to their rarity. This review defines myofibroblasts and details diagnostic features of benign and malignant lesions for improved accuracy.

Area of Science:

  • Pathology
  • Cell Biology
  • Oncology

Background:

  • Myofibroblastic lesions pose diagnostic challenges due to rarity and identification uncertainties.
  • Understanding myofibroblast biology is crucial for diagnosing these lesions.

Purpose of the Study:

  • Define the myofibroblast and its biology.
  • Describe benign and malignant myofibroblastic lesions, addressing diagnostic difficulties.
  • Clarify the nature of lesions traditionally considered myofibroblastic.

Main Methods:

  • Literature review focusing on myofibroblast definition, biology, and lesion characteristics.
  • Analysis of morphological, immunohistochemical, and ultrastructural features.
  • Comparison of diagnostic criteria for myofibroblastic and smooth muscle lesions.

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Experimental Generation of Carcinoma-Associated Fibroblasts (CAFs) from Human Mammary Fibroblasts
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Experimental Generation of Carcinoma-Associated Fibroblasts (CAFs) from Human Mammary Fibroblasts

Published on: October 25, 2011

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue
06:59

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Published on: October 12, 2013

Related Experiment Videos

Last Updated: Jun 28, 2026

Murine Dermal Fibroblast Isolation by FACS
06:04

Murine Dermal Fibroblast Isolation by FACS

Published on: January 7, 2016

Experimental Generation of Carcinoma-Associated Fibroblasts (CAFs) from Human Mammary Fibroblasts
15:43

Experimental Generation of Carcinoma-Associated Fibroblasts (CAFs) from Human Mammary Fibroblasts

Published on: October 25, 2011

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue
06:59

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Published on: October 12, 2013

Main Results:

  • Myofibroblasts are characterized by specific morphology, alpha-smooth muscle actin and extra domain A variant of cellular fibronectin expression, and distinct ultrastructural features (fibronexus).
  • Lesions vary in differentiation; some may represent smooth muscle rather than myofibroblastic origin.
  • Combined immunohistochemistry and electron microscopy enhance diagnostic confidence.

Conclusions:

  • Accurate diagnosis of myofibroblastic lesions requires a comprehensive understanding of myofibroblast characteristics.
  • Distinguishing myofibroblastic lesions from smooth muscle tumors is critical.
  • Integrated use of immunohistochemistry and electron microscopy is vital for definitive diagnosis.