Differential expression of somatostatin receptors in ependymoma: implications for diagnosis
| Autor: | Michelle Fevre Montange, Jacques Guyotat, Bret P, Claire Houzard, Francesco Signorelli, Jacques Champier, Ghislaine Saint Pierre, Anne Jouvet |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Ependymoma
Adult Male endocrine system Cancer Research Pathology medicine.medical_specialty Adolescent Brain tumor Biology World Health Organization fluids and secretions Glioma parasitic diseases medicine Biomarkers Tumor Humans RNA Messenger Receptors Somatostatin Receptor Child Radionuclide Imaging Aged Microscopy Somatostatin receptor Reverse Transcriptase Polymerase Chain Reaction fungi Infant Middle Aged medicine.disease Prognosis Immunohistochemistry Somatostatin Oncology Child Preschool Female hormones hormone substitutes and hormone antagonists Immunostaining Subcellular Fractions |
| Zdroj: | International journal of cancer. 95(3) |
| ISSN: | 0020-7136 |
| Popis: | Somatostatin receptors (SSts) have been found in a variety of brain tumors, e.g., meningiomas, medulloblastomas and astrocytomas. Our aim was to investigate their expression in ependymomas. Using RT-PCR, expression of mRNA for the different SSt subtypes was analyzed and quantified in 28 ependymomas and correlated with different variables (age, tumor location, histological grade, recurrence and survival). In addition, in 8 cases, protein expression was studied in vitro, using immunohistochemistry, and in vivo, by somatostatin scintigraphy. mRNAs for all 5 subtypes were variably expressed in each ependymoma. The Southern blotting signal obtained after SSt(1) and SSt(2) amplification was higher than that for the other receptor subtypes. No significant correlation was seen between the level of SSt(1) and SSt(2) mRNA expression and age, location, histological grading, recurrence or survival. In the 8 cases, SSt(1) staining was negative in 3 and low in 5. Staining for SSt(2A) was positive but low in every specimen analyzed. SSt(1) and SSt(2) immunoreactivity was seen only in the cytoplasm of tumoral cells. Somatostatin scintigraphy showed clear uptake, which agreed with MRI data in the majority of cases. However, no correlation was seen between tracer uptake intensity and histological grade, SSt(1) and SSt(2) mRNA expression or immunostaining intensity. This evidence for the expression of SSt(2) receptors in ependymomas opens interesting prospects for their follow-up. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text