Intraepithelial lymphocyte

Overview
Intraepithelial lymphocytes (IEL) are lymphocytes found in the epithelial layer of mammalian mucosal linings, such as the gastrointestinal (GI) tract and reproductive tract. In the GI tract, they are components of gut-associated lymphoid tissue (GALT).

IELs express gamma-delta heterodimers. Most gamma-delta T cell receptors (TCRs) lack the CD4+ and CD8+ marker, howerver, gamma-delta TCRs are unique in that they are CD8+.

Pathology
An elevated IEL population, as determined by biopsy, typically indicates ongoing inflammation within the mucosa. In diseases such as coeliac sprue, IEL elevation throughout the small intestine is one of many specific markers.

Alternatively, elevated IEL populations can be a marker for developing neoplasia in the tissue (such as found in cervical and prostate cancers). IELs themselves can of course, undergo mutation to become lymphoma.