Abstract
Underlying mechanisms leading to pituitary plasticity by which the gland adapts the number of hormone-producing cell to the continuously changing physiological requirements are still poorly understood. Adult stem cells were shown to direct homeostatic cell maintenance, regeneration, and functional plasticity in several organs and tissues. Only recently potential stem cells were identified and phenotypically characterized in adult pituitary. Multiple possible stem/progenitor cell candidates were proposed, but different studies have been only partially reconciled. Here, we critically analyzed the reports addressing the identification of adult pituitary stem cells, trying, when possible, to reunite the results of the different studies. Nonetheless, in light of the still non-complete characterization of these cells, some discrepancies among the published studies are still apparent. Importantly, long-term in vitro self-renewal, a defining feature of stem cells, remains to be unequivocally demonstrated. Finally, the potential role of adult pituitary stem (or progenitor) cells in pituitary adenoma development will be discussed.
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Abbreviations
- CSC:
-
Cancer stem cells
- FCS:
-
Fetal calf serum
- FS cells:
-
Folliculo-stellate cells
- GPS cells:
-
GFRα2-PROP1-STEM cells
- HMG:
-
High mobility group
- MP:
-
Main population
- PASCs:
-
Pituitary adenoma stem-like cells
- Sca1:
-
Stem cell antigen 1
- SMA:
-
Smooth muscle actin
- SP:
-
Side population
- TIC:
-
Tumor-initiating cells
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Acknowledgments
This work was supported by a grant from the Italian association for Cancer Research (AIRC).
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Florio, T. (2014). Adult Pituitary Stem Cells. In: Turksen, K. (eds) Adult Stem Cells. Stem Cell Biology and Regenerative Medicine. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4614-9569-7_5
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DOI: https://doi.org/10.1007/978-1-4614-9569-7_5
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