Abstract
BackgroundThe goal of this study was to determine a predominant cell type expressing fractalkine receptor (CX3CR1) in mature ovarian teratomas and to establish functional significance of its expression in cell differentiation.MethodsSpecimens of ovarian teratoma and human fetal tissues were analyzed by immunohistochemistry for CX3CR1expression. Ovarian teratocarcinoma cell line PA-1 was used as a model for cell differentiation.ResultsWe found that the majority of the specimens contained CX3CR1-positive cells of epidermal lineage. Skin keratinocytes in fetal tissues were also CX3CR1- positive. PA-1 cells with downregulated CX3CR1 failed to express a skin keratinocyte marker cytokeratin 14 when cultured on Matrigel in the presence of a morphogen, bone morphogenic protein 4 (BMP-4), as compared to those expressing scrambled shRNA.ConclusionsHere we demonstrate that CX3CR1 is expressed in both normally (fetal skin) and abnormally (ovarian teratoma) differentiated keratinocytes and is required for cell differentiation into epidermal lineage.
Highlights
The goal of this study was to determine a predominant cell type expressing fractalkine receptor (CX3CR1) in mature ovarian teratomas and to establish functional significance of its expression in cell differentiation
Fractalkine receptor (CX3CR1) is expressed in specimens of ovarian teratoma According to our previous observations CX3CR1 was expressed in cells comprising ovarian teratoma tissue specimens [8], the number of specimens was very limited in order to be able to draw any conclusions
We have found that skin keratinocytes represent the most predominant CX3CR1-positive cell type, which was present in 38% of tested cases of mature ovarian teratoma (Table 1, Figure 1)
Summary
The goal of this study was to determine a predominant cell type expressing fractalkine receptor (CX3CR1) in mature ovarian teratomas and to establish functional significance of its expression in cell differentiation. Skin keratinocytes in fetal tissues were CX3CR1- positive. Ovarian teratoma (dermoid cyst) is a benign tumor originating in germ cells. This tumor is one of the most common germ cell tumors and accounts for up to 20% of all ovarian cysts [1]. Mature ovarian teratomas often contain a mixture of fully differentiated tissues from all three cell layers, ectodermal, endodermal, and mesodermal, resulting in formation of skin, hair follicle, sebaceous gland, bone, teeth, thyroid, and other cell types [6,7]
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