Identification of CD133+ Cells in Pituitary Adenomas

Stem-like cells in tumors are capable of self-renewal and pluri-differentiation; they are thought to play important roles in tumor initiation and maintenance. Stem-like cells in malignant glioma express CD133. We examined samples from human pituitary adenoma, a generally benign neoplasm, for CD133 e...

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Veröffentlicht in:Neuroendocrinology 2011-01, Vol.94 (4), p.302-312
Hauptverfasser: Yunoue, Shunji, Arita, Kazunori, Kawano, Hiroto, Uchida, Hiroyuki, Tokimura, Hiroshi, Hirano, Hirofumi
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container_start_page 302
container_title Neuroendocrinology
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creator Yunoue, Shunji
Arita, Kazunori
Kawano, Hiroto
Uchida, Hiroyuki
Tokimura, Hiroshi
Hirano, Hirofumi
description Stem-like cells in tumors are capable of self-renewal and pluri-differentiation; they are thought to play important roles in tumor initiation and maintenance. Stem-like cells in malignant glioma express CD133. We examined samples from human pituitary adenoma, a generally benign neoplasm, for CD133 expression using routine immunohistochemical and biochemical methods. Our study of 70 pituitary adenomas (clinically nonfunctioning adenomas and growth hormone-, prolactin-, adrenocorticotropic hormone-, and thyroid-stimulating hormone-producing adenomas) showed that 18 (25.7%) expressed CD133. This rate was higher in clinically nonfunctioning (33.3%) than functioning adenomas (12.0%) (p = 0.085). Real-time PCR assay revealed the expression of CD133 mRNA in samples immunohistochemically positive for CD133. Neither the patient age and gender, nor the tumor size or postoperative recurrence rate correlated with CD133 positivity. CD133+ cells ubiquitously coexpressed CD34, nestin, and VEGFR2 (KDL1). S-100 and GFAP were not coexpressed with CD133. Chromogranin A, Pit-1, SF-1, and NeuroD1 were immune-negative, indicating that CD133+ cells did not have the potential to differentiate into functional endocrine cells. Our data suggest that the expression of CD133 in pituitary adenomas is related to immature endothelial progenitor cells that may play a role in the neovascularization of pituitary adenomas. Further studies are needed to elucidate the significance of CD133+ cells with respect to neovascularization and their sustainable growth in pituitary adenomas.
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Stem-like cells in malignant glioma express CD133. We examined samples from human pituitary adenoma, a generally benign neoplasm, for CD133 expression using routine immunohistochemical and biochemical methods. Our study of 70 pituitary adenomas (clinically nonfunctioning adenomas and growth hormone-, prolactin-, adrenocorticotropic hormone-, and thyroid-stimulating hormone-producing adenomas) showed that 18 (25.7%) expressed CD133. This rate was higher in clinically nonfunctioning (33.3%) than functioning adenomas (12.0%) (p = 0.085). Real-time PCR assay revealed the expression of CD133 mRNA in samples immunohistochemically positive for CD133. Neither the patient age and gender, nor the tumor size or postoperative recurrence rate correlated with CD133 positivity. CD133+ cells ubiquitously coexpressed CD34, nestin, and VEGFR2 (KDL1). S-100 and GFAP were not coexpressed with CD133. Chromogranin A, Pit-1, SF-1, and NeuroD1 were immune-negative, indicating that CD133+ cells did not have the potential to differentiate into functional endocrine cells. Our data suggest that the expression of CD133 in pituitary adenomas is related to immature endothelial progenitor cells that may play a role in the neovascularization of pituitary adenomas. 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Stem-like cells in malignant glioma express CD133. We examined samples from human pituitary adenoma, a generally benign neoplasm, for CD133 expression using routine immunohistochemical and biochemical methods. Our study of 70 pituitary adenomas (clinically nonfunctioning adenomas and growth hormone-, prolactin-, adrenocorticotropic hormone-, and thyroid-stimulating hormone-producing adenomas) showed that 18 (25.7%) expressed CD133. This rate was higher in clinically nonfunctioning (33.3%) than functioning adenomas (12.0%) (p = 0.085). Real-time PCR assay revealed the expression of CD133 mRNA in samples immunohistochemically positive for CD133. Neither the patient age and gender, nor the tumor size or postoperative recurrence rate correlated with CD133 positivity. CD133+ cells ubiquitously coexpressed CD34, nestin, and VEGFR2 (KDL1). S-100 and GFAP were not coexpressed with CD133. Chromogranin A, Pit-1, SF-1, and NeuroD1 were immune-negative, indicating that CD133+ cells did not have the potential to differentiate into functional endocrine cells. Our data suggest that the expression of CD133 in pituitary adenomas is related to immature endothelial progenitor cells that may play a role in the neovascularization of pituitary adenomas. Further studies are needed to elucidate the significance of CD133+ cells with respect to neovascularization and their sustainable growth in pituitary adenomas.</abstract><cop>Basel, Switzerland</cop><pub>Karger</pub><pmid>21912092</pmid><doi>10.1159/000330625</doi><tpages>11</tpages></addata></record>
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subjects AC133 Antigen
Adenoma - genetics
Adenoma - metabolism
Antigens, CD - genetics
Antigens, CD - metabolism
Antigens, CD34 - metabolism
Biological and medical sciences
Endocrinopathies
Endothelial Cells - metabolism
Female
Fundamental and applied biological sciences. Psychology
Glycoproteins - genetics
Glycoproteins - metabolism
Humans
Hypothalamus. Hypophysis. Epiphysis (diseases)
Intermediate Filament Proteins - metabolism
Male
Medical sciences
Middle Aged
Nerve Tissue Proteins - metabolism
Nestin
Non tumoral diseases. Target tissue resistance. Benign neoplasms
Original Paper
Peptides - genetics
Peptides - metabolism
Pituitary Neoplasms - genetics
Pituitary Neoplasms - metabolism
Real-Time Polymerase Chain Reaction
S100 Proteins - metabolism
Stem Cells - metabolism
Vascular Endothelial Growth Factor Receptor-2 - metabolism
Vertebrates: endocrinology
title Identification of CD133+ Cells in Pituitary Adenomas
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