Expression and localization of forkhead box protein FOXJ1 in S100β-positive multiciliated cells of the rat pituitary

Medical Molecular Morphology
Takashi NakakuraHaruo Hagiwara

Abstract

S100β-positive cells exist in the marginal cell layer (MCL) of the adenohypophysis and follicle structure in the parenchyma of anterior lobe (ALFS) in pituitary. They have multiple functions as phagocytes or cells that regulate hormone secretion. Majority of S100β-positive cells in the adenohypophysis express sex determining region Y-box 2 protein (SOX2), a stem cell marker; therefore, S100β/SOX2 double positive cells are also considered as one type of stem/progenitor cells. MCL and ALFS are consisting of morphologically two types of cells, i.e., multiciliated cells and non-ciliated cells. However, the relationship between the S100β-positive cells and multiciliated cells in the pituitary is largely unknown. In the present study, we first immunohistochemically verified the feature of multiciliated cells in MCL and ALFS. We then examined the expression patterns of FOXJ1, an essential expression factor for multiciliated cell-differentiation, and SOX2 in the S100β-positive multiciliated cells by in situ hybridization and immunohistochemistry. We identified anew the S100β/SOX2/FOXJ1 triple positive multiciliated cells, and revealed that they were dispersed throughout the MCL and ALFS. These results indicate that the MCL and ALFS are...Continue Reading

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Related Concepts

FOXJ1 protein, rat
Sox2 protein, rat
Metazoa
Cell Differentiation Process
Cilia
Immunocytochemistry
Pituitary Gland, Anterior
Colony-forming Unit
Gene Expression
Rats, Wistar

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