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'''Myoepithelial cells''' (sometimes referred to as '''myoepithelium''') are cells usually found in [[glandular epithelium]] as a thin layer above the [[basement membrane]] but generally beneath the [[lumen (anatomy)|luminal]] cells. These may be positive for [[ACTA2|alpha smooth muscle]] [[actin]] and can contract and expel the [[secretions]] of [[exocrine glands]]. They are found in the [[sweat gland]]s, [[mammary gland]]s, [[lacrimal gland]]s, and [[salivary gland]]s. Myoepithelial cells in these cases constitute the [[basal cell layer]] of an [[epithelium]] that harbors the epithelial [[Progenitor cell|progenitor]]. In the case of wound healing, myoepithelial cells reactively [[cell growth|proliferate]]. Presence of myoepithelial cells in a [[hyperplasia|hyperplastic]] tissue proves the benignity of the gland and, when absent, indicates [[cancer]]. Only rare cancers like [[adenoid cystic carcinoma]]s contains [[myoepithelial cells]] as one of the [[malignant]] components.
'''Myoepithelial cells''' (sometimes referred to as '''myoepithelium''') are cells usually found in [[glandular epithelium]] as a thin layer above the [[basement membrane]] but generally beneath the [[lumen (anatomy)|luminal]] cells. These may be positive for [[ACTA2|alpha smooth muscle]] [[actin]] and can contract and expel the [[secretions]] of [[exocrine glands]]. They are found in the [[sweat gland]]s, [[mammary gland]]s, [[lacrimal gland]]s, and [[salivary gland]]s. Myoepithelial cells in these cases constitute the [[basal cell layer]] of an [[epithelium]] that harbors the epithelial [[Progenitor cell|progenitor]]. In the case of wound healing, myoepithelial cells reactively [[cell growth|proliferate]]. Presence of myoepithelial cells in a [[hyperplasia|hyperplastic]] tissue proves the benignity of the gland and, when absent, indicates [[cancer]]. Only rare cancers like [[adenoid cystic carcinoma]]s contains [[myoepithelial cells]] as one of the [[malignant]] components.


It can be found in [[endoderm]] or [[ectoderm]].<ref name="Berman2009">{{cite book|author=Jules J. Berman|title=Neoplasms: principles of development and diversity|url=http://books.google.com/books?id=WWnJ1-IM1yUC&pg=PA207|accessdate=16 April 2010|year=2009|publisher=Jones & Bartlett Learning|isbn=978-0-7637-5570-6|pages=207–}}</ref>
It can be found in [[endoderm]] or [[ectoderm]].<ref name="Berman2009">{{cite book|author=Jules J. Berman|title=Neoplasms: principles of development and diversity|url=https://books.google.com/books?id=WWnJ1-IM1yUC&pg=PA207|accessdate=16 April 2010|year=2009|publisher=Jones & Bartlett Learning|isbn=978-0-7637-5570-6|pages=207–}}</ref>


==Markers==
==Markers==

Revision as of 22:13, 28 October 2016

Myoepithelial cell
Details
Identifiers
Latinmyoepitheliocytus
THH2.00.02.0.03059
FMA67799 67805, 67799
Anatomical terminology

Myoepithelial cells (sometimes referred to as myoepithelium) are cells usually found in glandular epithelium as a thin layer above the basement membrane but generally beneath the luminal cells. These may be positive for alpha smooth muscle actin and can contract and expel the secretions of exocrine glands. They are found in the sweat glands, mammary glands, lacrimal glands, and salivary glands. Myoepithelial cells in these cases constitute the basal cell layer of an epithelium that harbors the epithelial progenitor. In the case of wound healing, myoepithelial cells reactively proliferate. Presence of myoepithelial cells in a hyperplastic tissue proves the benignity of the gland and, when absent, indicates cancer. Only rare cancers like adenoid cystic carcinomas contains myoepithelial cells as one of the malignant components.

It can be found in endoderm or ectoderm.[1]

Markers

Myoepithelial cells are true epithelial cells positive for keratins, not to be confused with myofibroblasts which are true mesenchymal cells positive for vimentin. These cells are generally positive for alpha smooth muscle actin (αSMA), cytokeratin 5/6 and other high molecular weight cytokeratins, p63 and caldesmon. Myoepithelial cells are stellate in shape and are also known as basket cells. They lie between the basement membrane and glandular epithelium. Each cell consists of a cell body from which 4-8 processes radiate and embrace the secretory unit. Myoepithelial cells have contractile functions. They help in expelling secretions from the lumen of secretory units and facilitate the movement of saliva in salivary ducts.

References

  1. ^ Jules J. Berman (2009). Neoplasms: principles of development and diversity. Jones & Bartlett Learning. pp. 207–. ISBN 978-0-7637-5570-6. Retrieved 16 April 2010.